refactor CUC again

.github/workflows/ci.yml

@@ -1,39 +1,42 @@
+on: [push]
+
 name: ci
-on: [push, pull_request]
 
 jobs:
   check:
-    name: Check build
+    name: Check
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v2
-      - uses: dtolnay/rust-toolchain@stable
+      - uses: actions-rs/toolchain@v1
-      - run: cargo check --release
+        with:
-
+          profile: minimal
-  test:
+          toolchain: stable
-    name: Run Tests
+      - uses: actions-rs/cargo@v1
-    runs-on: ubuntu-latest
+        with:
-    steps:
+          command: check
-      - uses: actions/checkout@v4
+          args: --release
-      - uses: dtolnay/rust-toolchain@stable
-      - name: Install nextest
-        uses: taiki-e/install-action@nextest
-      - run: cargo nextest run --all-features
-      - run: cargo test --doc
 
   msrv:
-    name: Check MSRV
+    name: Check with MSRV
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v2
-      - uses: dtolnay/rust-toolchain@1.81.0
+      - uses: actions-rs/toolchain@v1
-      - run: cargo check --release
+        with:
+          toolchain: 1.61.0
+          override: true
+          profile: minimal
+      - uses: actions-rs/cargo@v1
+        with:
+          command: check
+          args: --release
 
   cross-check:
-    name: Check Cross-Compilation
+    name: Check Cross
     runs-on: ubuntu-latest
     strategy:
       matrix:
@@ -41,32 +44,70 @@ jobs:
           - armv7-unknown-linux-gnueabihf
           - thumbv7em-none-eabihf
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v2
-      - uses: dtolnay/rust-toolchain@stable
+      - uses: actions-rs/toolchain@v1
         with:
-          targets: "armv7-unknown-linux-gnueabihf, thumbv7em-none-eabihf"
+          profile: minimal
-      - run: cargo check --release --target=${{matrix.target}} --no-default-features
+          toolchain: stable
+          target: ${{ matrix.target }}
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          use-cross: true
+          command: check
+          args: --release --target=${{ matrix.target }} --no-default-features
 
   fmt:
-    name: Check formatting
+    name: Rustfmt
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v2
-      - uses: dtolnay/rust-toolchain@stable
+      - uses: actions-rs/toolchain@v1
-      - run: cargo fmt --all -- --check
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - run: rustup component add rustfmt
+      - uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check
 
-  docs:
+  check-doc:
     name: Check Documentation Build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v2
-      - uses: dtolnay/rust-toolchain@nightly
+      - uses: actions-rs/toolchain@v1
-      - run: RUSTDOCFLAGS="--cfg docsrs --generate-link-to-definition -Z unstable-options" cargo +nightly doc --all-features
+        with:
+          toolchain: nightly
+          override: true
+          profile: minimal
+      - uses: actions-rs/cargo@v1
+        with:
+          command: doc
+          args: --all-features
 
   clippy:
     name: Clippy
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v2
-      - uses: dtolnay/rust-toolchain@stable
+      - uses: actions-rs/toolchain@v1
-      - run: cargo clippy -- -D warnings
+        with:
+          profile: minimal
+          toolchain: stable
+      - run: rustup component add clippy
+      - uses: actions-rs/cargo@v1
+        with:
+          command: clippy
+          args: -- -D warnings
+
+  ci:
+      if: ${{ success() }}
+      # all new jobs must be added to this list
+      needs: [check, fmt, clippy]
+      runs-on: ubuntu-latest
+      steps:
+        - name: CI succeeded
+          run: exit 0

CHANGELOG.md

@@ -8,108 +8,6 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 # [unreleased]
 
-# [v0.13.1] 2025-03-21
-
-- Bugfix due to operator precendence for `PusTcSecondaryHeader::pus_version`, 
-  `PusTcSecondaryHeaderWithoutTimestamp::pus_version`, `CdsTime::from_bytes_with_u16_days` and
-  `CdsTime::from_bytes_with_u24_days`
-
-# [v0.13.0] 2024-11-08
-
-- Bumped MSRV to 1.81.0
-- Bump `zerocopy` to v0.8.0
-- Bump `thiserror` to v2.0.0
-
-## Changed
-
-- Migrated all Error implementations to thiserror, improved some naming and error handling in
-  general
-
-# [v0.12.0] 2024-09-10
-
-- Bumped MSRV to 1.70.0
-
-## Added
-
-- Added new `cfdp::tlv::TlvOwned` type which erases the lifetime and is clonable.
-- Dedicated `cfdp::tlv::TlvLvDataTooLarge` error struct for APIs where this is the only possible
-  API error.
-- Added File Data PDU API which expects the expected file data size and then exposes the unwritten
-  file data field as a mutable slice. This allows to read data from the virtual file system
-  API to the file data buffer without an intermediate buffer.
-- Generic `EofPdu::new` constructor.
-- Added generic sequence counter module.
-- Added `MsgToUserTlv::to_tlv` converter which reduced the type and converts
-  it to a generic `Tlv`.
-- Implemented `From<MsgToUserTlv> for Tlv` converter trait.
-- Added CFDP maximum file segment length calculator method `calculate_max_file_seg_len_for_max_packet_len_and_pdu_header`
-
-## Added and Changed
-
-- Added new `ReadableTlv` to avoid some boilerplate code and have a common abstraction implemented
-  for both `Tlv` and `TlvOwned` to read the raw TLV data field and its length.
-- Replaced `cfdp::tlv::TlvLvError` by `cfdp::tlv::TlvLvDataTooLarge` where applicable.
-
-## Fixed
-
-- Fixed an error in the EOF writer which wrote the fault location to the wrong buffer position.
-- cfdp `ConditionCode::CheckLimitReached` previous had the wrong numerical value of `0b1001` (9)
-  and now has the correct value of `0b1010` (10).
-
-## Changed
-
-- Minor documentation build updates.
-- Increased delegate version range to v0.13
-
-# [v0.11.2] 2024-05-19
-
-- Bumped MSRV to 1.68.2
-
-## Fixed
-
-- Removed `defmt::Format` impl for `MetadataPduCreator` which seems to be problematic.
-
-# [v0.11.1] 2024-04-22
-
-## Fixed
-
-- The default data length for for `SpHeader` constructors where the data field length is not
-  specified is now 0.
-- The `SpHeader::new_from_fields` is public now.
-
-## Added
-
-- `SpHeader::to_vec` method.
-
-# [v0.11.0] 2024-04-16
-
-## Changed
-
-- Moved `CCSDS_HEADER_LEN` constant to the crate root.
-
-## Added
-
-- Added `SpacePacketHeader` type alias for `SpHeader` type.
-
-# [v0.11.0-rc.2] 2024-04-04
-
-## Changed
-
-- Renamed `PacketId` and `PacketSequenceCtrl` `new` method to `new_checked` and former
-  `new_const` method to `new`.
-- Renamed `tc`, `tm`, `tc_unseg` and `tm_unseg` variants for `PacketId` and `SpHeader`
-  to `new_for_tc_checked`, `new_for_tm_checked`, `new_for_unseg_tc_checked` and
-  `new_for_unseg_tm_checked`.
-- `PusTmCreator` and `PusTcCreator` now expect a regular instance of `SpHeader` instead of
-  a mutable reference.
-
-## Added
-
-- `SpHeader::new_from_apid` and `SpHeader::new_from_apid_checked` constructor.
-- `#[inline]` attribute for a lot of small functions.
-
-# [v0.11.0-rc.1] 2024-04-03
-
 Major API changes for the time API. If you are using the time API, it is strongly recommended
 to check all the API changes in the **Changed** chapter.
 
@@ -126,14 +24,9 @@ to check all the API changes in the **Changed** chapter.
 - Added basic support conversions to the `time` library. Introduce new `chrono` and `timelib`
   feature gate.
 - Added `CcsdsTimeProvider::timelib_date_time`.
-- Optional support for `defmt` by adding optional `defmt::Format` derives for common types.
 
 ## Changed
 
-- `PusTcCreator::new_simple` now expects a valid slice for the source data instead of an optional
-  slice. For telecommands without application data, `&[]` can be passed.
-- `PusTmSecondaryHeader` constructors now expects a valid slice for the time stamp instead of an
-  optional slice.
 - Renamed `CcsdsTimeProvider::date_time` to `CcsdsTimeProvider::chrono_date_time`
 - Renamed `CcsdsTimeCodes` to `CcsdsTimeCode`
 - Renamed `cds::TimeProvider` to `cds::CdsTime`
@@ -141,7 +34,6 @@ to check all the API changes in the **Changed** chapter.
 - `UnixTimestamp` renamed to `UnixTime`
 - `UnixTime` seconds are now private and can be retrieved using the `secs` member method.
 - `UnixTime::new` renamed to `UnixTime::new_checked`.
-- `UnixTime::secs` renamed to `UnixTime::as_secs`.
 - `UnixTime` now has a nanosecond subsecond precision. The `new` constructor now expects
    nanoseconds as the second argument.
 - Added new `UnixTime::new_subsec_millis` and `UnixTime::new_subsec_millis_checked` API
@@ -151,16 +43,6 @@ to check all the API changes in the **Changed** chapter.
 - `CcsdsTimeProvider::date_time` renamed to `CcsdsTimeProvider::chrono_date_time`.
 - Added `UnixTime::MIN`, `UnixTime::MAX` and `UnixTime::EPOCH`.
 - Added `UnixTime::timelib_date_time`.
-- Error handling for ECSS and time module is more granular now, with a new
-  `DateBeforeCcsdsEpochError` error and a `DateBeforeCcsdsEpoch` enum variant for both
-  `CdsError` and `CucError`.
-- `PusTmCreator` now has two lifetimes: One for the raw source data buffer and one for the
-  raw timestamp.
-- Time API `from_now*` API renamed to `now*`.
-
-## Removed
-
-- Legacy `PusTm` and `PusTc` objects.
 
 # [v0.11.0-rc.0] 2024-03-04
 
@@ -567,7 +449,3 @@ The timestamp of `PusTm` is now optional. See Added and Changed section for deta
 
 Initial release with CCSDS Space Packet Primary Header implementation and basic PUS TC and TM
 implementations.
-
-[v0.13.1]: https://egit.irs.uni-stuttgart.de/rust/spacepackets/compare/v0.13.0...v0.13.1
-[v0.13.0]: https://egit.irs.uni-stuttgart.de/rust/spacepackets/compare/v0.12.0...v0.13.0
-[v0.12.0]: https://egit.irs.uni-stuttgart.de/rust/spacepackets/compare/v0.11.2...v0.12.0

Cargo.toml

@@ -1,8 +1,8 @@
 [package]
 name = "spacepackets"
-version = "0.13.1"
+version = "0.11.0-rc.0"
 edition = "2021"
-rust-version = "1.81.0"
+rust-version = "1.61"
 authors = ["Robin Mueller <muellerr@irs.uni-stuttgart.de>"]
 description = "Generic implementations for various CCSDS and ECSS packet standards"
 homepage = "https://egit.irs.uni-stuttgart.de/rust/spacepackets"
@@ -14,16 +14,15 @@ categories = ["aerospace", "aerospace::space-protocols", "no-std", "hardware-sup
 
 [dependencies]
 crc = "3"
-delegate = ">=0.8, <=0.13"
+delegate = ">=0.8, <0.11"
-paste = "1"
 
 [dependencies.zerocopy]
-version = "0.8"
+version = "0.7"
 features = ["derive"]
 
 [dependencies.thiserror]
-version = "2"
+version = "1"
-default-features = false
+optional = true
 
 [dependencies.num_enum]
 version = ">0.5, <=0.7"
@@ -49,21 +48,18 @@ optional = true
 version = "0.2"
 default-features = false
 
-[dependencies.defmt]
+[dev-dependencies]
-version = "0.3"
+postcard = "1"
-optional = true
+chrono = "0.4"
 
 [features]
 default = ["std"]
-std = ["alloc", "chrono/std", "chrono/clock", "thiserror/std"]
+std = ["chrono/std", "chrono/clock", "alloc", "thiserror"]
-serde = ["dep:serde", "chrono?/serde"]
+serde = ["dep:serde", "chrono/serde"]
-alloc = ["chrono?/alloc", "defmt?/alloc", "serde?/alloc"]
+alloc = ["postcard/alloc", "chrono/alloc"]
+chrono = ["dep:chrono"]
 timelib = ["dep:time"]
 
-[dev-dependencies]
-postcard = { version = "1", features = ["alloc"] }
-chrono = "0.4"
-
 [package.metadata.docs.rs]
 all-features = true
-rustdoc-args = ["--generate-link-to-definition"]
+rustdoc-args = ["--cfg", "doc_cfg", "--generate-link-to-definition"]

FUNDING.yml

@@ -1 +0,0 @@
-github: robamu

README.md

@@ -29,6 +29,10 @@ Currently, this includes the following components:
 
 `spacepackets` supports various runtime environments and is also suitable for `no_std` environments.
 
+It also offers optional support for [`serde`](https://serde.rs/). This allows serializing and
+deserializing them with an appropriate `serde` provider like
+[`postcard`](https://github.com/jamesmunns/postcard).
+
 ## Default features
 
  - [`std`](https://doc.rust-lang.org/std/): Enables functionality relying on the standard library.
@@ -41,8 +45,6 @@ Currently, this includes the following components:
  - [`serde`](https://serde.rs/): Adds `serde` support for most types by adding `Serialize` and `Deserialize` `derive`s
  - [`chrono`](https://crates.io/crates/chrono): Add basic support for the `chrono` time library.
  - [`timelib`](https://crates.io/crates/time): Add basic support for the `time` time library.
- - [`defmt`](https://defmt.ferrous-systems.com/): Add support for the `defmt` by adding the
-   [`defmt::Format`](https://defmt.ferrous-systems.com/format) derive on many types.
 
 # Examples
 
@@ -61,13 +63,3 @@ cargo install grcov --locked
 
 After that, you can simply run `coverage.py` to test the project with coverage. You can optionally
 supply the `--open` flag to open the coverage report in your webbrowser.
-
-# Miri
-
-You can run the [`miri`](https://github.com/rust-lang/miri) tool on this library to check for
-undefined behaviour (UB). This library does not use use any `unsafe` code blocks, but `miri` could
-still catch UB from used libraries.
-
-```sh
-cargo +nightly miri nextest run --all-features
-```

automation/Dockerfile

@@ -15,10 +15,7 @@ RUN rustup install nightly && \
     rustup target add thumbv7em-none-eabihf armv7-unknown-linux-gnueabihf && \
     rustup component add rustfmt clippy llvm-tools-preview
 
-# Get grcov
 RUN curl -sSL https://github.com/mozilla/grcov/releases/download/v0.8.19/grcov-x86_64-unknown-linux-gnu.tar.bz2 | tar -xj --directory /usr/local/bin
-# Get nextest
-RUN curl -LsSf https://get.nexte.st/latest/linux | tar zxf - -C ${CARGO_HOME:-~/.cargo}/bin
 
 # SSH stuff to allow deployment to doc server
 RUN adduser --uid 114 jenkins

automation/Jenkinsfile

@@ -21,9 +21,7 @@ pipeline {
     }
     stage('Docs') {
         steps {
-          sh """
+          sh 'cargo +nightly doc --all-features'
-            RUSTDOCFLAGS="--cfg docsrs --generate-link-to-definition -Z unstable-options" cargo +nightly doc --all-features
-          """
         }
     }
     stage('Rustfmt') {
@@ -33,8 +31,7 @@ pipeline {
     }
     stage('Test') {
       steps {
-        sh 'cargo nextest r --all-features'
+        sh 'cargo test --all-features'
-        sh 'cargo test --doc'
       }
     }
     stage('Check with all features') {

docs.sh

@@ -1,3 +0,0 @@
-#!/bin/sh
-export RUSTDOCFLAGS="--cfg docsrs --generate-link-to-definition -Z unstable-options"
-cargo +nightly doc --all-features --open

release-checklist.md

@@ -4,14 +4,11 @@ Checklist for new releases
 # Pre-Release
 
 1. Make sure any new modules are documented sufficiently enough and check docs with
-   `RUSTDOCFLAGS="--cfg docsrs --generate-link-to-definition -Z unstable-options" cargo +nightly doc --all-features --open`
+   `cargo +nightly doc --all-features --config 'rustdocflags=["--cfg", "doc_cfg"]' --open`.
-   or `cargo +nightly doc --all-features --config 'build.rustdocflags=["--cfg", "docsrs" --generate-link-to-definition"]' --open`
-   (was problematic on more recent nightly versions).
 2. Bump version specifier in `Cargo.toml`.
 3. Update `CHANGELOG.md`: Convert `unreleased` section into version section with date and add new
    `unreleased` section.
-4. Run `cargo test --all-features` or `cargo nextest r --all-features` together with
+4. Run `cargo test --all-features`.
-   `cargo test --doc`.
 5. Run `cargo fmt` and `cargo clippy`. Check `cargo msrv` against MSRV in `Cargo.toml`.
 6. Wait for CI/CD results for EGit and Github. These also check cross-compilation for bare-metal
    targets.

src/cfdp/lv.rs

@@ -1,4 +1,5 @@
 //! Generic CFDP length-value (LV) abstraction as specified in CFDP 5.1.8.
+use crate::cfdp::TlvLvError;
 use crate::ByteConversionError;
 use core::str::Utf8Error;
 #[cfg(feature = "serde")]
@@ -6,8 +7,6 @@ use serde::{Deserialize, Serialize};
 #[cfg(feature = "std")]
 use std::string::String;
 
-use super::TlvLvDataTooLargeError;
-
 pub const MIN_LV_LEN: usize = 1;
 
 /// Generic CFDP length-value (LV) abstraction as specified in CFDP 5.1.8.
@@ -21,7 +20,6 @@ pub const MIN_LV_LEN: usize = 1;
 ///    this will be the lifetime of that data reference.
 #[derive(Debug, Copy, Clone, Eq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct Lv<'data> {
     data: &'data [u8],
     // If the LV was generated from a raw bytestream, this will contain the start of the
@@ -63,10 +61,9 @@ pub(crate) fn generic_len_check_deserialization(
 }
 
 impl<'data> Lv<'data> {
-    #[inline]
+    pub fn new(data: &[u8]) -> Result<Lv, TlvLvError> {
-    pub fn new(data: &[u8]) -> Result<Lv, TlvLvDataTooLargeError> {
         if data.len() > u8::MAX as usize {
-            return Err(TlvLvDataTooLargeError(data.len()));
+            return Err(TlvLvError::DataTooLarge(data.len()));
         }
         Ok(Lv {
             data,
@@ -75,7 +72,6 @@ impl<'data> Lv<'data> {
     }
 
     /// Creates a LV with an empty value field.
-    #[inline]
     pub fn new_empty() -> Lv<'data> {
         Lv {
             data: &[],
@@ -85,52 +81,45 @@ impl<'data> Lv<'data> {
 
     /// Helper function to build a string LV. This is especially useful for the file or directory
     /// path LVs
-    #[inline]
+    pub fn new_from_str(str_slice: &str) -> Result<Lv, TlvLvError> {
-    pub fn new_from_str(str_slice: &str) -> Result<Lv, TlvLvDataTooLargeError> {
         Self::new(str_slice.as_bytes())
     }
 
     /// Helper function to build a string LV. This is especially useful for the file or directory
     /// path LVs
     #[cfg(feature = "std")]
-    #[inline]
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
-    pub fn new_from_string(string: &'data String) -> Result<Lv<'data>, TlvLvDataTooLargeError> {
+    pub fn new_from_string(string: &'data String) -> Result<Lv<'data>, TlvLvError> {
         Self::new(string.as_bytes())
     }
 
     /// Returns the length of the value part, not including the length byte.
-    #[inline]
     pub fn len_value(&self) -> usize {
         self.data.len()
     }
 
     /// Returns the full raw length, including the length byte.
-    #[inline]
     pub fn len_full(&self) -> usize {
         self.len_value() + 1
     }
 
     /// Checks whether the value field is empty.
-    #[inline]
     pub fn is_empty(&self) -> bool {
         self.data.len() == 0
     }
 
-    #[inline]
     pub fn value(&self) -> &[u8] {
         self.data
     }
 
     /// If the LV was generated from a raw bytestream using [Self::from_bytes], the raw start
     /// of the LV can be retrieved with this method.
-    #[inline]
     pub fn raw_data(&self) -> Option<&[u8]> {
         self.raw_data
     }
 
     /// Convenience function to extract the value as a [str]. This is useful if the LV is
     /// known to contain a [str], for example being a file name.
-    #[inline]
     pub fn value_as_str(&self) -> Option<Result<&'data str, Utf8Error>> {
         if self.is_empty() {
             return None;
@@ -146,7 +135,6 @@ impl<'data> Lv<'data> {
     }
 
     /// Reads a LV  from a raw buffer.
-    #[inline]
     pub fn from_bytes(buf: &'data [u8]) -> Result<Lv<'data>, ByteConversionError> {
         generic_len_check_deserialization(buf, MIN_LV_LEN)?;
         Self::from_be_bytes_no_len_check(buf)
@@ -163,7 +151,6 @@ impl<'data> Lv<'data> {
         MIN_LV_LEN + self.data.len()
     }
 
-    #[inline]
     pub(crate) fn from_be_bytes_no_len_check(
         buf: &'data [u8],
     ) -> Result<Lv<'data>, ByteConversionError> {
@@ -178,10 +165,10 @@ impl<'data> Lv<'data> {
 
 #[cfg(test)]
 pub mod tests {
+    use super::*;
     use alloc::string::ToString;
 
-    use super::*;
+    use crate::cfdp::TlvLvError;
-
     use crate::ByteConversionError;
     use std::string::String;
 
@@ -272,11 +259,15 @@ pub mod tests {
         let lv = Lv::new(&data_big);
         assert!(lv.is_err());
         let error = lv.unwrap_err();
-        assert_eq!(error.0, u8::MAX as usize + 1);
+        if let TlvLvError::DataTooLarge(size) = error {
+            assert_eq!(size, u8::MAX as usize + 1);
             assert_eq!(
                 error.to_string(),
                 "data with size 256 larger than allowed 255 bytes"
             );
+        } else {
+            panic!("invalid exception {:?}", error)
+        }
     }
 
     #[test]

src/cfdp/mod.rs

@@ -1,8 +1,11 @@
 //! Low-level CCSDS File Delivery Protocol (CFDP) support according to [CCSDS 727.0-B-5](https://public.ccsds.org/Pubs/727x0b5.pdf).
 use crate::ByteConversionError;
+use core::fmt::{Display, Formatter};
 use num_enum::{IntoPrimitive, TryFromPrimitive};
 #[cfg(feature = "serde")]
 use serde::{Deserialize, Serialize};
+#[cfg(feature = "std")]
+use std::error::Error;
 
 pub mod lv;
 pub mod pdu;
@@ -15,7 +18,6 @@ pub const CFDP_VERSION_2: u8 = 0b001;
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, TryFromPrimitive, IntoPrimitive)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[repr(u8)]
 pub enum PduType {
     FileDirective = 0,
@@ -24,7 +26,6 @@ pub enum PduType {
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, TryFromPrimitive, IntoPrimitive)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[repr(u8)]
 pub enum Direction {
     TowardsReceiver = 0,
@@ -33,7 +34,6 @@ pub enum Direction {
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, TryFromPrimitive, IntoPrimitive)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[repr(u8)]
 pub enum TransmissionMode {
     Acknowledged = 0,
@@ -42,7 +42,6 @@ pub enum TransmissionMode {
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, TryFromPrimitive, IntoPrimitive)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[repr(u8)]
 pub enum CrcFlag {
     NoCrc = 0,
@@ -70,7 +69,6 @@ impl From<CrcFlag> for bool {
 /// Always 0 and ignored for File Directive PDUs (CCSDS 727.0-B-5 P.75)
 #[derive(Debug, Copy, Clone, PartialEq, Eq, TryFromPrimitive, IntoPrimitive)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[repr(u8)]
 pub enum SegmentMetadataFlag {
     NotPresent = 0,
@@ -80,7 +78,6 @@ pub enum SegmentMetadataFlag {
 /// Always 0 and ignored for File Directive PDUs (CCSDS 727.0-B-5 P.75)
 #[derive(Debug, Copy, Clone, PartialEq, Eq, TryFromPrimitive, IntoPrimitive)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[repr(u8)]
 pub enum SegmentationControl {
     NoRecordBoundaryPreservation = 0,
@@ -89,7 +86,6 @@ pub enum SegmentationControl {
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, TryFromPrimitive, IntoPrimitive)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[repr(u8)]
 pub enum FaultHandlerCode {
     NoticeOfCancellation = 0b0001,
@@ -100,7 +96,6 @@ pub enum FaultHandlerCode {
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, TryFromPrimitive, IntoPrimitive)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[repr(u8)]
 pub enum ConditionCode {
     /// This is not an error condition for which a faulty handler override can be specified
@@ -113,7 +108,7 @@ pub enum ConditionCode {
     FileSizeError = 0b0110,
     NakLimitReached = 0b0111,
     InactivityDetected = 0b1000,
-    CheckLimitReached = 0b1010,
+    CheckLimitReached = 0b1001,
     UnsupportedChecksumType = 0b1011,
     /// Not an actual fault condition for which fault handler overrides can be specified
     SuspendRequestReceived = 0b1110,
@@ -123,7 +118,6 @@ pub enum ConditionCode {
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, TryFromPrimitive, IntoPrimitive)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[repr(u8)]
 pub enum LargeFileFlag {
     /// 32 bit maximum file size and FSS size
@@ -135,7 +129,6 @@ pub enum LargeFileFlag {
 /// Transaction status for the ACK PDU field according to chapter 5.2.4 of the CFDP standard.
 #[derive(Debug, Copy, Clone, PartialEq, Eq, TryFromPrimitive, IntoPrimitive)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[repr(u8)]
 pub enum TransactionStatus {
     /// Transaction is not currently active and the CFDP implementation does not retain a
@@ -153,7 +146,6 @@ pub enum TransactionStatus {
 /// [SANA Checksum Types registry](https://sanaregistry.org/r/checksum_identifiers/)
 #[derive(Debug, Copy, Clone, PartialEq, Eq, TryFromPrimitive, IntoPrimitive)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[repr(u8)]
 pub enum ChecksumType {
     /// Modular legacy checksum
@@ -173,43 +165,75 @@ impl Default for ChecksumType {
 
 pub const NULL_CHECKSUM_U32: [u8; 4] = [0; 4];
 
-#[derive(Debug, Copy, Clone, PartialEq, Eq, thiserror::Error)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
+pub enum TlvLvError {
-#[error("data with size {0} larger than allowed {max} bytes", max = u8::MAX)]
+    DataTooLarge(usize),
-pub struct TlvLvDataTooLargeError(pub usize);
+    ByteConversion(ByteConversionError),
-
     /// First value: Found value. Second value: Expected value if there is one.
-#[derive(Debug, Copy, Clone, PartialEq, Eq, thiserror::Error)]
+    InvalidTlvTypeField {
-#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
-#[error("invalid TLV type field, found {found}, expected {expected:?}")]
-pub struct InvalidTlvTypeFieldError {
         found: u8,
         expected: Option<u8>,
-}
+    },
-
+    /// Logically invalid value length detected. The value length may not exceed 255 bytes.
-#[derive(Debug, Copy, Clone, PartialEq, Eq, thiserror::Error)]
+    /// Depending on the concrete TLV type, the value length may also be logically invalid.
-#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
-pub enum TlvLvError {
-    #[error("{0}")]
-    DataTooLarge(#[from] TlvLvDataTooLargeError),
-    #[error("byte conversion error: {0}")]
-    ByteConversion(#[from] ByteConversionError),
-    #[error("{0}")]
-    InvalidTlvTypeField(#[from] InvalidTlvTypeFieldError),
-    #[error("invalid value length {0}")]
     InvalidValueLength(usize),
     /// Only applies to filestore requests and responses. Second name was missing where one is
     /// expected.
-    #[error("second name missing for filestore request or response")]
     SecondNameMissing,
     /// Invalid action code for filestore requests or responses.
-    #[error("invalid action code {0}")]
     InvalidFilestoreActionCode(u8),
 }
 
+impl From<ByteConversionError> for TlvLvError {
+    fn from(value: ByteConversionError) -> Self {
+        Self::ByteConversion(value)
+    }
+}
+
+impl Display for TlvLvError {
+    fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
+        match self {
+            TlvLvError::DataTooLarge(data_len) => {
+                write!(
+                    f,
+                    "data with size {} larger than allowed {} bytes",
+                    data_len,
+                    u8::MAX
+                )
+            }
+            TlvLvError::ByteConversion(e) => {
+                write!(f, "tlv or lv byte conversion: {}", e)
+            }
+            TlvLvError::InvalidTlvTypeField { found, expected } => {
+                write!(
+                    f,
+                    "invalid TLV type field, found {found}, expected {expected:?}"
+                )
+            }
+            TlvLvError::InvalidValueLength(len) => {
+                write!(f, "invalid value length {len}")
+            }
+            TlvLvError::SecondNameMissing => {
+                write!(f, "second name missing for filestore request or response")
+            }
+            TlvLvError::InvalidFilestoreActionCode(raw) => {
+                write!(f, "invalid filestore action code with raw value {raw}")
+            }
+        }
+    }
+}
+
+#[cfg(feature = "std")]
+impl Error for TlvLvError {
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+        match self {
+            TlvLvError::ByteConversion(e) => Some(e),
+            _ => None,
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

src/cfdp/pdu/ack.rs

@@ -15,7 +15,6 @@ use serde::{Deserialize, Serialize};
 /// For more information, refer to CFDP chapter 5.2.4.
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct AckPdu {
     pdu_header: PduHeader,
     directive_code_of_acked_pdu: FileDirectiveType,

src/cfdp/pdu/eof.rs

@@ -15,7 +15,6 @@ use super::{CfdpPdu, WritablePduPacket};
 /// For more information, refer to CFDP chapter 5.2.2.
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct EofPdu {
     pdu_header: PduHeader,
     condition_code: ConditionCode,
@@ -25,36 +24,20 @@ pub struct EofPdu {
 }
 
 impl EofPdu {
-    pub fn new(
+    pub fn new_no_error(mut pdu_header: PduHeader, file_checksum: u32, file_size: u64) -> Self {
-        mut pdu_header: PduHeader,
-        condition_code: ConditionCode,
-        file_checksum: u32,
-        file_size: u64,
-        fault_location: Option<EntityIdTlv>,
-    ) -> Self {
         // Force correct direction flag.
         pdu_header.pdu_conf.direction = Direction::TowardsReceiver;
         let mut eof_pdu = Self {
             pdu_header,
-            condition_code,
+            condition_code: ConditionCode::NoError,
             file_checksum,
             file_size,
-            fault_location,
+            fault_location: None,
         };
         eof_pdu.pdu_header.pdu_datafield_len = eof_pdu.calc_pdu_datafield_len() as u16;
         eof_pdu
     }
 
-    pub fn new_no_error(pdu_header: PduHeader, file_checksum: u32, file_size: u64) -> Self {
-        Self::new(
-            pdu_header,
-            ConditionCode::NoError,
-            file_checksum,
-            file_size,
-            None,
-        )
-    }
-
     pub fn pdu_header(&self) -> &PduHeader {
         &self.pdu_header
     }
@@ -164,7 +147,7 @@ impl WritablePduPacket for EofPdu {
             &mut buf[current_idx..],
         )?;
         if let Some(fault_location) = self.fault_location {
-            current_idx += fault_location.write_to_bytes(&mut buf[current_idx..])?;
+            current_idx += fault_location.write_to_bytes(buf)?;
         }
         if self.crc_flag() == CrcFlag::WithCrc {
             current_idx = add_pdu_crc(buf, current_idx);
@@ -187,23 +170,13 @@ mod tests {
     use crate::cfdp::{ConditionCode, CrcFlag, LargeFileFlag, PduType, TransmissionMode};
     #[cfg(feature = "serde")]
     use crate::tests::generic_serde_test;
-    use crate::util::{UnsignedByteFieldU16, UnsignedEnum};
 
-    fn verify_state_no_error_no_crc(eof_pdu: &EofPdu, file_flag: LargeFileFlag) {
+    fn verify_state(&eof_pdu: &EofPdu, file_flag: LargeFileFlag) {
-        verify_state(eof_pdu, CrcFlag::NoCrc, file_flag, ConditionCode::NoError);
-    }
-
-    fn verify_state(
-        eof_pdu: &EofPdu,
-        crc_flag: CrcFlag,
-        file_flag: LargeFileFlag,
-        cond_code: ConditionCode,
-    ) {
         assert_eq!(eof_pdu.file_checksum(), 0x01020304);
         assert_eq!(eof_pdu.file_size(), 12);
-        assert_eq!(eof_pdu.condition_code(), cond_code);
+        assert_eq!(eof_pdu.condition_code(), ConditionCode::NoError);
 
-        assert_eq!(eof_pdu.crc_flag(), crc_flag);
+        assert_eq!(eof_pdu.crc_flag(), CrcFlag::NoCrc);
         assert_eq!(eof_pdu.file_flag(), file_flag);
         assert_eq!(eof_pdu.pdu_type(), PduType::FileDirective);
         assert_eq!(
@@ -223,7 +196,7 @@ mod tests {
         let pdu_header = PduHeader::new_no_file_data(pdu_conf, 0);
         let eof_pdu = EofPdu::new_no_error(pdu_header, 0x01020304, 12);
         assert_eq!(eof_pdu.len_written(), pdu_header.header_len() + 2 + 4 + 4);
-        verify_state_no_error_no_crc(&eof_pdu, LargeFileFlag::Normal);
+        verify_state(&eof_pdu, LargeFileFlag::Normal);
     }
 
     #[test]
@@ -297,7 +270,7 @@ mod tests {
         buf[written - 1] -= 1;
         let crc: u16 = ((buf[written - 2] as u16) << 8) as u16 | buf[written - 1] as u16;
         let error = EofPdu::from_bytes(&buf).unwrap_err();
-        if let PduError::Checksum(e) = error {
+        if let PduError::ChecksumError(e) = error {
             assert_eq!(e, crc);
         } else {
             panic!("expected crc error");
@@ -309,7 +282,7 @@ mod tests {
         let pdu_conf = common_pdu_conf(CrcFlag::NoCrc, LargeFileFlag::Large);
         let pdu_header = PduHeader::new_no_file_data(pdu_conf, 0);
         let eof_pdu = EofPdu::new_no_error(pdu_header, 0x01020304, 12);
-        verify_state_no_error_no_crc(&eof_pdu, LargeFileFlag::Large);
+        verify_state(&eof_pdu, LargeFileFlag::Large);
         assert_eq!(eof_pdu.len_written(), pdu_header.header_len() + 2 + 8 + 4);
     }
 
@@ -321,48 +294,4 @@ mod tests {
         let eof_pdu = EofPdu::new_no_error(pdu_header, 0x01020304, 12);
         generic_serde_test(eof_pdu);
     }
-
-    fn generic_test_with_fault_location_and_error(crc: CrcFlag) {
-        let pdu_conf = common_pdu_conf(crc, LargeFileFlag::Normal);
-        let pdu_header = PduHeader::new_no_file_data(pdu_conf, 0);
-        let eof_pdu = EofPdu::new(
-            pdu_header,
-            ConditionCode::FileChecksumFailure,
-            0x01020304,
-            12,
-            Some(EntityIdTlv::new(UnsignedByteFieldU16::new(5).into())),
-        );
-        let mut expected_len = pdu_header.header_len() + 2 + 4 + 4 + 4;
-        if crc == CrcFlag::WithCrc {
-            expected_len += 2;
-        }
-        // Entity ID TLV increaes length by 4.
-        assert_eq!(eof_pdu.len_written(), expected_len);
-        verify_state(
-            &eof_pdu,
-            crc,
-            LargeFileFlag::Normal,
-            ConditionCode::FileChecksumFailure,
-        );
-        let eof_vec = eof_pdu.to_vec().unwrap();
-        let eof_read_back = EofPdu::from_bytes(&eof_vec);
-        if let Err(e) = eof_read_back {
-            panic!("deserialization failed with: {e}")
-        }
-        let eof_read_back = eof_read_back.unwrap();
-        assert_eq!(eof_read_back, eof_pdu);
-        assert!(eof_read_back.fault_location.is_some());
-        assert_eq!(eof_read_back.fault_location.unwrap().entity_id().value(), 5);
-        assert_eq!(eof_read_back.fault_location.unwrap().entity_id().size(), 2);
-    }
-
-    #[test]
-    fn test_with_fault_location_and_error() {
-        generic_test_with_fault_location_and_error(CrcFlag::NoCrc);
-    }
-
-    #[test]
-    fn test_with_fault_location_and_error_and_crc() {
-        generic_test_with_fault_location_and_error(CrcFlag::WithCrc);
-    }
 }

src/cfdp/pdu/file_data.rs

@@ -92,67 +92,16 @@ impl<'seg_meta> SegmentMetadata<'seg_meta> {
     }
 }
 
-#[derive(Debug, Copy, Clone, PartialEq, Eq)]
-#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-struct FdPduBase<'seg_meta> {
-    pdu_header: PduHeader,
-    #[cfg_attr(feature = "serde", serde(borrow))]
-    segment_metadata: Option<SegmentMetadata<'seg_meta>>,
-    offset: u64,
-}
-
-impl CfdpPdu for FdPduBase<'_> {
-    fn pdu_header(&self) -> &PduHeader {
-        &self.pdu_header
-    }
-
-    fn file_directive_type(&self) -> Option<FileDirectiveType> {
-        None
-    }
-}
-
-impl FdPduBase<'_> {
-    fn calc_pdu_datafield_len(&self, file_data_len: u64) -> usize {
-        let mut len = core::mem::size_of::<u32>();
-        if self.pdu_header.pdu_conf.file_flag == LargeFileFlag::Large {
-            len += 4;
-        }
-        if self.segment_metadata.is_some() {
-            len += self.segment_metadata.as_ref().unwrap().written_len()
-        }
-        len += file_data_len as usize;
-        if self.crc_flag() == CrcFlag::WithCrc {
-            len += 2;
-        }
-        len
-    }
-
-    fn write_common_fields_to_bytes(&self, buf: &mut [u8]) -> Result<usize, PduError> {
-        let mut current_idx = self.pdu_header.write_to_bytes(buf)?;
-        if self.segment_metadata.is_some() {
-            current_idx += self
-                .segment_metadata
-                .as_ref()
-                .unwrap()
-                .write_to_bytes(&mut buf[current_idx..])?;
-        }
-        current_idx += write_fss_field(
-            self.pdu_header.common_pdu_conf().file_flag,
-            self.offset,
-            &mut buf[current_idx..],
-        )?;
-        Ok(current_idx)
-    }
-}
-
 /// File Data PDU abstraction.
 ///
 /// For more information, refer to CFDP chapter 5.3.
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub struct FileDataPdu<'seg_meta, 'file_data> {
+    pdu_header: PduHeader,
     #[cfg_attr(feature = "serde", serde(borrow))]
-    common: FdPduBase<'seg_meta>,
+    segment_metadata: Option<SegmentMetadata<'seg_meta>>,
+    offset: u64,
     file_data: &'file_data [u8],
 }
 
@@ -185,34 +134,42 @@ impl<'seg_meta, 'file_data> FileDataPdu<'seg_meta, 'file_data> {
             pdu_header.seg_metadata_flag = SegmentMetadataFlag::Present;
         }
         let mut pdu = Self {
-            common: FdPduBase {
             pdu_header,
             segment_metadata,
             offset,
-            },
             file_data,
         };
-        pdu.common.pdu_header.pdu_datafield_len = pdu.calc_pdu_datafield_len() as u16;
+        pdu.pdu_header.pdu_datafield_len = pdu.calc_pdu_datafield_len() as u16;
         pdu
     }
 
     fn calc_pdu_datafield_len(&self) -> usize {
-        self.common
+        let mut len = core::mem::size_of::<u32>();
-            .calc_pdu_datafield_len(self.file_data.len() as u64)
+        if self.pdu_header.pdu_conf.file_flag == LargeFileFlag::Large {
+            len += 4;
         }
-
+        if self.segment_metadata.is_some() {
-    pub fn segment_metadata(&self) -> Option<&SegmentMetadata> {
+            len += self.segment_metadata.as_ref().unwrap().written_len()
-        self.common.segment_metadata.as_ref()
+        }
+        len += self.file_data.len();
+        if self.crc_flag() == CrcFlag::WithCrc {
+            len += 2;
+        }
+        len
     }
 
     pub fn offset(&self) -> u64 {
-        self.common.offset
+        self.offset
     }
 
     pub fn file_data(&self) -> &'file_data [u8] {
         self.file_data
     }
 
+    pub fn segment_metadata(&self) -> Option<&SegmentMetadata> {
+        self.segment_metadata.as_ref()
+    }
+
     pub fn from_bytes<'buf: 'seg_meta + 'file_data>(buf: &'buf [u8]) -> Result<Self, PduError> {
         let (pdu_header, mut current_idx) = PduHeader::from_bytes(buf)?;
         let full_len_without_crc = pdu_header.verify_length_and_checksum(buf)?;
@@ -233,18 +190,16 @@ impl<'seg_meta, 'file_data> FileDataPdu<'seg_meta, 'file_data> {
             .into());
         }
         Ok(Self {
-            common: FdPduBase {
             pdu_header,
             segment_metadata,
             offset,
-            },
             file_data: &buf[current_idx..full_len_without_crc],
         })
     }
 }
 impl CfdpPdu for FileDataPdu<'_, '_> {
     fn pdu_header(&self) -> &PduHeader {
-        &self.common.pdu_header
+        &self.pdu_header
     }
 
     fn file_directive_type(&self) -> Option<FileDirectiveType> {
@@ -261,8 +216,19 @@ impl WritablePduPacket for FileDataPdu<'_, '_> {
             }
             .into());
         }
-
+        let mut current_idx = self.pdu_header.write_to_bytes(buf)?;
-        let mut current_idx = self.common.write_common_fields_to_bytes(buf)?;
+        if self.segment_metadata.is_some() {
+            current_idx += self
+                .segment_metadata
+                .as_ref()
+                .unwrap()
+                .write_to_bytes(&mut buf[current_idx..])?;
+        }
+        current_idx += write_fss_field(
+            self.pdu_header.common_pdu_conf().file_flag,
+            self.offset,
+            &mut buf[current_idx..],
+        )?;
         buf[current_idx..current_idx + self.file_data.len()].copy_from_slice(self.file_data);
         current_idx += self.file_data.len();
         if self.crc_flag() == CrcFlag::WithCrc {
@@ -272,167 +238,10 @@ impl WritablePduPacket for FileDataPdu<'_, '_> {
     }
 
     fn len_written(&self) -> usize {
-        self.common.pdu_header.header_len() + self.calc_pdu_datafield_len()
+        self.pdu_header.header_len() + self.calc_pdu_datafield_len()
     }
 }
 
-/// File Data PDU creator abstraction.
-///
-/// This special creator object allows to read into the file data buffer directly. This avoids
-/// the need of an additional buffer to create a file data PDU. This structure therefore
-/// does not implement the regular [WritablePduPacket] trait.
-///
-/// For more information, refer to CFDP chapter 5.3.
-#[derive(Debug, Copy, Clone, PartialEq, Eq)]
-#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-pub struct FileDataPduCreatorWithReservedDatafield<'seg_meta> {
-    #[cfg_attr(feature = "serde", serde(borrow))]
-    common: FdPduBase<'seg_meta>,
-    file_data_len: u64,
-}
-
-impl<'seg_meta> FileDataPduCreatorWithReservedDatafield<'seg_meta> {
-    pub fn new_with_seg_metadata(
-        pdu_header: PduHeader,
-        segment_metadata: SegmentMetadata<'seg_meta>,
-        offset: u64,
-        file_data_len: u64,
-    ) -> Self {
-        Self::new_generic(pdu_header, Some(segment_metadata), offset, file_data_len)
-    }
-
-    pub fn new_no_seg_metadata(pdu_header: PduHeader, offset: u64, file_data_len: u64) -> Self {
-        Self::new_generic(pdu_header, None, offset, file_data_len)
-    }
-
-    pub fn new_generic(
-        mut pdu_header: PduHeader,
-        segment_metadata: Option<SegmentMetadata<'seg_meta>>,
-        offset: u64,
-        file_data_len: u64,
-    ) -> Self {
-        pdu_header.pdu_type = PduType::FileData;
-        if segment_metadata.is_some() {
-            pdu_header.seg_metadata_flag = SegmentMetadataFlag::Present;
-        }
-        let mut pdu = Self {
-            common: FdPduBase {
-                pdu_header,
-                segment_metadata,
-                offset,
-            },
-            file_data_len,
-        };
-        pdu.common.pdu_header.pdu_datafield_len = pdu.calc_pdu_datafield_len() as u16;
-        pdu
-    }
-
-    fn calc_pdu_datafield_len(&self) -> usize {
-        self.common.calc_pdu_datafield_len(self.file_data_len)
-    }
-
-    pub fn len_written(&self) -> usize {
-        self.common.pdu_header.header_len() + self.calc_pdu_datafield_len()
-    }
-
-    /// This function performs a partial write by writing all data except the file data
-    /// and the CRC.
-    ///
-    /// It returns a [FileDataPduCreatorWithUnwrittenData] which provides a mutable slice to
-    /// the reserved file data field. The user can read file data into this field directly and
-    /// then finish the PDU creation using the [FileDataPduCreatorWithUnwrittenData::finish] call.
-    pub fn write_to_bytes_partially<'buf>(
-        &self,
-        buf: &'buf mut [u8],
-    ) -> Result<FileDataPduCreatorWithUnwrittenData<'buf>, PduError> {
-        if buf.len() < self.len_written() {
-            return Err(ByteConversionError::ToSliceTooSmall {
-                found: buf.len(),
-                expected: self.len_written(),
-            }
-            .into());
-        }
-        let mut current_idx = self.common.write_common_fields_to_bytes(buf)?;
-        let file_data_offset = current_idx as u64;
-        current_idx += self.file_data_len as usize;
-        if self.crc_flag() == CrcFlag::WithCrc {
-            current_idx += 2;
-        }
-        Ok(FileDataPduCreatorWithUnwrittenData {
-            write_buf: &mut buf[0..current_idx],
-            file_data_offset,
-            file_data_len: self.file_data_len,
-            needs_crc: self.crc_flag() == CrcFlag::WithCrc,
-        })
-    }
-}
-
-impl CfdpPdu for FileDataPduCreatorWithReservedDatafield<'_> {
-    fn pdu_header(&self) -> &PduHeader {
-        &self.common.pdu_header
-    }
-
-    fn file_directive_type(&self) -> Option<FileDirectiveType> {
-        None
-    }
-}
-
-/// This structure is created with [FileDataPduCreatorWithReservedDatafield::write_to_bytes_partially]
-/// and provides an API to read file data from the virtual filesystem into the file data PDU buffer
-/// directly.
-///
-/// This structure provides a mutable slice to the reserved file data field. The user can read
-/// file data into this field directly and then finish the PDU creation using the
-/// [FileDataPduCreatorWithUnwrittenData::finish] call.
-pub struct FileDataPduCreatorWithUnwrittenData<'buf> {
-    write_buf: &'buf mut [u8],
-    file_data_offset: u64,
-    file_data_len: u64,
-    needs_crc: bool,
-}
-
-impl FileDataPduCreatorWithUnwrittenData<'_> {
-    pub fn file_data_field_mut(&mut self) -> &mut [u8] {
-        &mut self.write_buf[self.file_data_offset as usize
-            ..self.file_data_offset as usize + self.file_data_len as usize]
-    }
-
-    /// This functio needs to be called to add a CRC to the file data PDU where applicable.
-    ///
-    /// It returns the full written size of the PDU.
-    pub fn finish(self) -> usize {
-        if self.needs_crc {
-            add_pdu_crc(
-                self.write_buf,
-                self.file_data_offset as usize + self.file_data_len as usize,
-            );
-        }
-        self.write_buf.len()
-    }
-}
-
-/// This function can be used to calculate the maximum allowed file segment size for
-/// a given maximum packet length and the segment metadata if there is any.
-pub fn calculate_max_file_seg_len_for_max_packet_len_and_pdu_header(
-    pdu_header: &PduHeader,
-    max_packet_len: usize,
-    segment_metadata: Option<&SegmentMetadata>,
-) -> usize {
-    let mut subtract = pdu_header.header_len();
-    if segment_metadata.is_some() {
-        subtract += 1 + segment_metadata.as_ref().unwrap().metadata().unwrap().len();
-    }
-    if pdu_header.common_pdu_conf().file_flag == LargeFileFlag::Large {
-        subtract += 8;
-    } else {
-        subtract += 4;
-    }
-    if pdu_header.common_pdu_conf().crc_flag == CrcFlag::WithCrc {
-        subtract += 2;
-    }
-    max_packet_len.saturating_sub(subtract)
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -454,7 +263,7 @@ mod tests {
         assert!(fd_pdu.segment_metadata().is_none());
         assert_eq!(
             fd_pdu.len_written(),
-            fd_pdu.pdu_header().header_len() + core::mem::size_of::<u32>() + 4
+            fd_pdu.pdu_header.header_len() + core::mem::size_of::<u32>() + 4
         );
 
         assert_eq!(fd_pdu.crc_flag(), CrcFlag::NoCrc);
@@ -481,11 +290,11 @@ mod tests {
         let written = res.unwrap();
         assert_eq!(
             written,
-            fd_pdu.pdu_header().header_len() + core::mem::size_of::<u32>() + 4
+            fd_pdu.pdu_header.header_len() + core::mem::size_of::<u32>() + 4
         );
-        let mut current_idx = fd_pdu.pdu_header().header_len();
+        let mut current_idx = fd_pdu.pdu_header.header_len();
         let file_size = u32::from_be_bytes(
-            buf[fd_pdu.pdu_header().header_len()..fd_pdu.pdu_header().header_len() + 4]
+            buf[fd_pdu.pdu_header.header_len()..fd_pdu.pdu_header.header_len() + 4]
                 .try_into()
                 .unwrap(),
         );
@@ -544,7 +353,7 @@ mod tests {
         buf[written - 1] -= 1;
         let crc: u16 = ((buf[written - 2] as u16) << 8) | buf[written - 1] as u16;
         let error = FileDataPdu::from_bytes(&buf).unwrap_err();
-        if let PduError::Checksum(e) = error {
+        if let PduError::ChecksumError(e) = error {
             assert_eq!(e, crc);
         } else {
             panic!("expected crc error");
@@ -571,7 +380,7 @@ mod tests {
         assert_eq!(*fd_pdu.segment_metadata().unwrap(), segment_meta);
         assert_eq!(
             fd_pdu.len_written(),
-            fd_pdu.pdu_header().header_len()
+            fd_pdu.pdu_header.header_len()
                 + 1
                 + seg_metadata.len()
                 + core::mem::size_of::<u32>()
@@ -581,7 +390,7 @@ mod tests {
         fd_pdu
             .write_to_bytes(&mut buf)
             .expect("writing FD PDU failed");
-        let mut current_idx = fd_pdu.pdu_header().header_len();
+        let mut current_idx = fd_pdu.pdu_header.header_len();
         assert_eq!(
             RecordContinuationState::try_from((buf[current_idx] >> 6) & 0b11).unwrap(),
             RecordContinuationState::StartAndEnd
@@ -673,142 +482,4 @@ mod tests {
         let output_converted_back: FileDataPdu = from_bytes(&output).unwrap();
         assert_eq!(output_converted_back, fd_pdu);
     }
-
-    #[test]
-    fn test_fd_pdu_creator_with_reserved_field_no_crc() {
-        let common_conf =
-            CommonPduConfig::new_with_byte_fields(TEST_SRC_ID, TEST_DEST_ID, TEST_SEQ_NUM).unwrap();
-        let pdu_header = PduHeader::new_for_file_data_default(common_conf, 0);
-        let test_str = "hello world!";
-        let fd_pdu = FileDataPduCreatorWithReservedDatafield::new_no_seg_metadata(
-            pdu_header,
-            10,
-            test_str.len() as u64,
-        );
-        let mut write_buf: [u8; 64] = [0; 64];
-        let mut pdu_unwritten = fd_pdu
-            .write_to_bytes_partially(&mut write_buf)
-            .expect("partial write failed");
-        pdu_unwritten
-            .file_data_field_mut()
-            .copy_from_slice(test_str.as_bytes());
-        pdu_unwritten.finish();
-
-        let pdu_reader = FileDataPdu::from_bytes(&write_buf).expect("reading file data PDU failed");
-        assert_eq!(
-            core::str::from_utf8(pdu_reader.file_data()).expect("reading utf8 string failed"),
-            "hello world!"
-        );
-    }
-
-    #[test]
-    fn test_fd_pdu_creator_with_reserved_field_with_crc() {
-        let mut common_conf =
-            CommonPduConfig::new_with_byte_fields(TEST_SRC_ID, TEST_DEST_ID, TEST_SEQ_NUM).unwrap();
-        common_conf.crc_flag = true.into();
-        let pdu_header = PduHeader::new_for_file_data_default(common_conf, 0);
-        let test_str = "hello world!";
-        let fd_pdu = FileDataPduCreatorWithReservedDatafield::new_no_seg_metadata(
-            pdu_header,
-            10,
-            test_str.len() as u64,
-        );
-        let mut write_buf: [u8; 64] = [0; 64];
-        let mut pdu_unwritten = fd_pdu
-            .write_to_bytes_partially(&mut write_buf)
-            .expect("partial write failed");
-        pdu_unwritten
-            .file_data_field_mut()
-            .copy_from_slice(test_str.as_bytes());
-        pdu_unwritten.finish();
-
-        let pdu_reader = FileDataPdu::from_bytes(&write_buf).expect("reading file data PDU failed");
-        assert_eq!(
-            core::str::from_utf8(pdu_reader.file_data()).expect("reading utf8 string failed"),
-            "hello world!"
-        );
-    }
-
-    #[test]
-    fn test_fd_pdu_creator_with_reserved_field_with_crc_without_finish_fails() {
-        let mut common_conf =
-            CommonPduConfig::new_with_byte_fields(TEST_SRC_ID, TEST_DEST_ID, TEST_SEQ_NUM).unwrap();
-        common_conf.crc_flag = true.into();
-        let pdu_header = PduHeader::new_for_file_data_default(common_conf, 0);
-        let test_str = "hello world!";
-        let fd_pdu = FileDataPduCreatorWithReservedDatafield::new_no_seg_metadata(
-            pdu_header,
-            10,
-            test_str.len() as u64,
-        );
-        let mut write_buf: [u8; 64] = [0; 64];
-        let mut pdu_unwritten = fd_pdu
-            .write_to_bytes_partially(&mut write_buf)
-            .expect("partial write failed");
-        pdu_unwritten
-            .file_data_field_mut()
-            .copy_from_slice(test_str.as_bytes());
-
-        let pdu_reader_error = FileDataPdu::from_bytes(&write_buf);
-        assert!(pdu_reader_error.is_err());
-        let error = pdu_reader_error.unwrap_err();
-        match error {
-            PduError::Checksum(_) => (),
-            _ => {
-                panic!("unexpected PDU error {}", error)
-            }
-        }
-    }
-
-    #[test]
-    fn test_max_file_seg_calculator_0() {
-        let pdu_header = PduHeader::new_for_file_data_default(CommonPduConfig::default(), 0);
-        assert_eq!(
-            calculate_max_file_seg_len_for_max_packet_len_and_pdu_header(&pdu_header, 64, None),
-            53
-        );
-    }
-
-    #[test]
-    fn test_max_file_seg_calculator_1() {
-        let common_conf = CommonPduConfig {
-            crc_flag: CrcFlag::WithCrc,
-            ..Default::default()
-        };
-        let pdu_header = PduHeader::new_for_file_data_default(common_conf, 0);
-        assert_eq!(
-            calculate_max_file_seg_len_for_max_packet_len_and_pdu_header(&pdu_header, 64, None),
-            51
-        );
-    }
-
-    #[test]
-    fn test_max_file_seg_calculator_2() {
-        let common_conf = CommonPduConfig {
-            file_flag: LargeFileFlag::Large,
-            ..Default::default()
-        };
-        let pdu_header = PduHeader::new_for_file_data_default(common_conf, 0);
-        assert_eq!(
-            calculate_max_file_seg_len_for_max_packet_len_and_pdu_header(&pdu_header, 64, None),
-            49
-        );
-    }
-
-    #[test]
-    fn test_max_file_seg_calculator_saturating_sub() {
-        let common_conf = CommonPduConfig {
-            file_flag: LargeFileFlag::Large,
-            ..Default::default()
-        };
-        let pdu_header = PduHeader::new_for_file_data_default(common_conf, 0);
-        assert_eq!(
-            calculate_max_file_seg_len_for_max_packet_len_and_pdu_header(&pdu_header, 15, None),
-            0
-        );
-        assert_eq!(
-            calculate_max_file_seg_len_for_max_packet_len_and_pdu_header(&pdu_header, 14, None),
-            0
-        );
-    }
 }

src/cfdp/pdu/finished.rs

@@ -4,18 +4,16 @@ use crate::cfdp::pdu::{
 use crate::cfdp::tlv::{
     EntityIdTlv, FilestoreResponseTlv, GenericTlv, Tlv, TlvType, TlvTypeField, WritableTlv,
 };
-use crate::cfdp::{ConditionCode, CrcFlag, Direction, PduType};
+use crate::cfdp::{ConditionCode, CrcFlag, Direction, PduType, TlvLvError};
 use crate::ByteConversionError;
 use num_enum::{IntoPrimitive, TryFromPrimitive};
 #[cfg(feature = "serde")]
 use serde::{Deserialize, Serialize};
 
-use super::tlv::ReadableTlv;
+use super::{CfdpPdu, WritablePduPacket};
-use super::{CfdpPdu, InvalidTlvTypeFieldError, WritablePduPacket};
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, TryFromPrimitive, IntoPrimitive)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[repr(u8)]
 pub enum DeliveryCode {
     Complete = 0,
@@ -24,7 +22,6 @@ pub enum DeliveryCode {
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, TryFromPrimitive, IntoPrimitive)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[repr(u8)]
 pub enum FileStatus {
     DiscardDeliberately = 0b00,
@@ -37,7 +34,6 @@ pub enum FileStatus {
 ///
 /// For more information, refer to CFDP chapter 5.2.3.
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct FinishedPduCreator<'fs_responses> {
     pdu_header: PduHeader,
     condition_code: ConditionCode,
@@ -223,7 +219,6 @@ impl<'buf> Iterator for FilestoreResponseIterator<'buf> {
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct FinishedPduReader<'buf> {
     pdu_header: PduHeader,
     condition_code: ConditionCode,
@@ -332,26 +327,22 @@ impl<'buf> FinishedPduReader<'buf> {
                         // last TLV, everything else would break the whole handling of the packet
                         // TLVs.
                         if current_idx != full_len_without_crc {
-                            return Err(PduError::Format);
+                            return Err(PduError::FormatError);
                         }
                     } else {
-                        return Err(PduError::TlvLv(
+                        return Err(TlvLvError::InvalidTlvTypeField {
-                            InvalidTlvTypeFieldError {
                             found: tlv_type.into(),
                             expected: Some(TlvType::FilestoreResponse.into()),
                         }
-                            .into(),
+                        .into());
-                        ));
                     }
                 }
                 TlvTypeField::Custom(raw) => {
-                    return Err(PduError::TlvLv(
+                    return Err(TlvLvError::InvalidTlvTypeField {
-                        InvalidTlvTypeFieldError {
                         found: raw,
                         expected: None,
                     }
-                        .into(),
+                    .into());
-                    ));
                 }
             }
         }
@@ -568,7 +559,7 @@ mod tests {
         buf[written - 1] -= 1;
         let crc: u16 = ((buf[written - 2] as u16) << 8) as u16 | buf[written - 1] as u16;
         let error = FinishedPduReader::new(&buf).unwrap_err();
-        if let PduError::Checksum(e) = error {
+        if let PduError::ChecksumError(e) = error {
             assert_eq!(e, crc);
         } else {
             panic!("expected crc error");

src/cfdp/pdu/metadata.rs

@@ -1,5 +1,3 @@
-#[cfg(feature = "alloc")]
-use super::tlv::TlvOwned;
 use crate::cfdp::lv::Lv;
 use crate::cfdp::pdu::{
     add_pdu_crc, generic_length_checks_pdu_deserialization, read_fss_field, write_fss_field,
@@ -13,12 +11,10 @@ use alloc::vec::Vec;
 #[cfg(feature = "serde")]
 use serde::{Deserialize, Serialize};
 
-use super::tlv::ReadableTlv;
 use super::{CfdpPdu, WritablePduPacket};
 
 #[derive(Default, Debug, Copy, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct MetadataGenericParams {
     pub closure_requested: bool,
     pub checksum_type: ChecksumType,
@@ -54,15 +50,6 @@ pub fn build_metadata_opts_from_vec(
     build_metadata_opts_from_slice(buf, tlvs.as_slice())
 }
 
-#[cfg(feature = "alloc")]
-pub fn build_metadata_opts_from_owned_slice(tlvs: &[TlvOwned]) -> Vec<u8> {
-    let mut sum_vec = Vec::new();
-    for tlv in tlvs {
-        sum_vec.extend(tlv.to_vec());
-    }
-    sum_vec
-}
-
 /// Metadata PDU creator abstraction.
 ///
 /// This abstraction exposes a specialized API for creating metadata PDUs as specified in
@@ -73,7 +60,7 @@ pub struct MetadataPduCreator<'src_name, 'dest_name, 'opts> {
     metadata_params: MetadataGenericParams,
     src_file_name: Lv<'src_name>,
     dest_file_name: Lv<'dest_name>,
-    options: &'opts [u8],
+    options: &'opts [Tlv<'opts>],
 }
 
 impl<'src_name, 'dest_name, 'opts> MetadataPduCreator<'src_name, 'dest_name, 'opts> {
@@ -97,7 +84,7 @@ impl<'src_name, 'dest_name, 'opts> MetadataPduCreator<'src_name, 'dest_name, 'op
         metadata_params: MetadataGenericParams,
         src_file_name: Lv<'src_name>,
         dest_file_name: Lv<'dest_name>,
-        options: &'opts [u8],
+        options: &'opts [Tlv<'opts>],
     ) -> Self {
         Self::new(
             pdu_header,
@@ -113,7 +100,7 @@ impl<'src_name, 'dest_name, 'opts> MetadataPduCreator<'src_name, 'dest_name, 'op
         metadata_params: MetadataGenericParams,
         src_file_name: Lv<'src_name>,
         dest_file_name: Lv<'dest_name>,
-        options: &'opts [u8],
+        options: &'opts [Tlv<'opts>],
     ) -> Self {
         pdu_header.pdu_type = PduType::FileDirective;
         pdu_header.pdu_conf.direction = Direction::TowardsReceiver;
@@ -140,19 +127,10 @@ impl<'src_name, 'dest_name, 'opts> MetadataPduCreator<'src_name, 'dest_name, 'op
         self.dest_file_name
     }
 
-    pub fn options(&self) -> &'opts [u8] {
+    pub fn options(&self) -> &'opts [Tlv<'opts>] {
         self.options
     }
 
-    /// Yield an iterator which can be used to loop through all options. Returns [None] if the
-    /// options field is empty.
-    pub fn options_iter(&self) -> OptionsIter<'_> {
-        OptionsIter {
-            opt_buf: self.options,
-            current_idx: 0,
-        }
-    }
-
     fn calc_pdu_datafield_len(&self) -> usize {
         // One directve type octet and one byte of the directive parameter field.
         let mut len = 2;
@@ -163,7 +141,9 @@ impl<'src_name, 'dest_name, 'opts> MetadataPduCreator<'src_name, 'dest_name, 'op
         }
         len += self.src_file_name.len_full();
         len += self.dest_file_name.len_full();
-        len += self.options().len();
+        for tlv in self.options() {
+            len += tlv.len_full()
+        }
         if self.crc_flag() == CrcFlag::WithCrc {
             len += 2;
         }
@@ -209,8 +189,10 @@ impl WritablePduPacket for MetadataPduCreator<'_, '_, '_> {
         current_idx += self
             .dest_file_name
             .write_to_be_bytes(&mut buf[current_idx..])?;
-        buf[current_idx..current_idx + self.options.len()].copy_from_slice(self.options);
+        for opt in self.options() {
-        current_idx += self.options.len();
+            opt.write_to_bytes(&mut buf[current_idx..current_idx + opt.len_full()])?;
+            current_idx += opt.len_full();
+        }
         if self.crc_flag() == CrcFlag::WithCrc {
             current_idx = add_pdu_crc(buf, current_idx);
         }
@@ -259,7 +241,6 @@ impl<'opts> Iterator for OptionsIter<'opts> {
 /// involved.
 #[derive(Debug)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct MetadataPduReader<'buf> {
     pdu_header: PduHeader,
     metadata_params: MetadataGenericParams,
@@ -371,7 +352,7 @@ pub mod tests {
     };
     use crate::cfdp::pdu::{CfdpPdu, PduError, WritablePduPacket};
     use crate::cfdp::pdu::{FileDirectiveType, PduHeader};
-    use crate::cfdp::tlv::{ReadableTlv, Tlv, TlvOwned, TlvType, WritableTlv};
+    use crate::cfdp::tlv::{Tlv, TlvType};
     use crate::cfdp::{
         ChecksumType, CrcFlag, Direction, LargeFileFlag, PduType, SegmentMetadataFlag,
         SegmentationControl, TransmissionMode,
@@ -381,16 +362,16 @@ pub mod tests {
     const SRC_FILENAME: &str = "hello-world.txt";
     const DEST_FILENAME: &str = "hello-world2.txt";
 
-    fn generic_metadata_pdu(
+    fn generic_metadata_pdu<'opts>(
         crc_flag: CrcFlag,
         checksum_type: ChecksumType,
         closure_requested: bool,
         fss: LargeFileFlag,
-        opts: &[u8],
+        opts: &'opts [Tlv],
     ) -> (
         Lv<'static>,
         Lv<'static>,
-        MetadataPduCreator<'static, 'static, '_>,
+        MetadataPduCreator<'static, 'static, 'opts>,
     ) {
         let pdu_header = PduHeader::new_no_file_data(common_pdu_conf(crc_flag, fss), 0);
         let metadata_params = MetadataGenericParams::new(closure_requested, checksum_type, 0x1010);
@@ -560,9 +541,9 @@ pub mod tests {
         assert_eq!(written.metadata_params(), read.metadata_params());
         assert_eq!(written.src_file_name(), read.src_file_name());
         assert_eq!(written.dest_file_name(), read.dest_file_name());
-        let opts = written.options_iter();
+        let opts = written.options();
-        for (tlv_written, tlv_read) in opts.zip(read.options_iter().unwrap()) {
+        for (tlv_written, tlv_read) in opts.iter().zip(read.options_iter().unwrap()) {
-            assert_eq!(&tlv_written, &tlv_read);
+            assert_eq!(tlv_written, &tlv_read);
         }
     }
 
@@ -677,14 +658,14 @@ pub mod tests {
         let tlv1 = Tlv::new_empty(TlvType::FlowLabel);
         let msg_to_user: [u8; 4] = [1, 2, 3, 4];
         let tlv2 = Tlv::new(TlvType::MsgToUser, &msg_to_user).unwrap();
-        let mut tlv_buf: [u8; 64] = [0; 64];
+        let tlv_vec = vec![tlv1, tlv2];
-        let opts_len = build_metadata_opts_from_slice(&mut tlv_buf, &[tlv1, tlv2]).unwrap();
+        let opts_len = tlv1.len_full() + tlv2.len_full();
         let (src_filename, dest_filename, metadata_pdu) = generic_metadata_pdu(
             CrcFlag::NoCrc,
             ChecksumType::Crc32,
             false,
             LargeFileFlag::Normal,
-            &tlv_buf[0..opts_len],
+            &tlv_vec,
         );
         let mut buf: [u8; 128] = [0; 128];
         let write_res = metadata_pdu.write_to_bytes(&mut buf);
@@ -707,55 +688,7 @@ pub mod tests {
         let opts_iter = opts_iter.unwrap();
         let mut accumulated_len = 0;
         for (idx, opt) in opts_iter.enumerate() {
-            if idx == 0 {
+            assert_eq!(tlv_vec[idx], opt);
-                assert_eq!(tlv1, opt);
-            } else if idx == 1 {
-                assert_eq!(tlv2, opt);
-            }
-            accumulated_len += opt.len_full();
-        }
-        assert_eq!(accumulated_len, pdu_read_back.options().len());
-    }
-    #[test]
-    fn test_with_owned_opts() {
-        let tlv1 = TlvOwned::new_empty(TlvType::FlowLabel);
-        let msg_to_user: [u8; 4] = [1, 2, 3, 4];
-        let tlv2 = TlvOwned::new(TlvType::MsgToUser, &msg_to_user);
-        let mut all_tlvs = tlv1.to_vec();
-        all_tlvs.extend(tlv2.to_vec());
-        let (src_filename, dest_filename, metadata_pdu) = generic_metadata_pdu(
-            CrcFlag::NoCrc,
-            ChecksumType::Crc32,
-            false,
-            LargeFileFlag::Normal,
-            &all_tlvs,
-        );
-        let mut buf: [u8; 128] = [0; 128];
-        let write_res = metadata_pdu.write_to_bytes(&mut buf);
-        assert!(write_res.is_ok());
-        let written = write_res.unwrap();
-        assert_eq!(
-            written,
-            metadata_pdu.pdu_header.header_len()
-                + 1
-                + 1
-                + 4
-                + src_filename.len_full()
-                + dest_filename.len_full()
-                + all_tlvs.len()
-        );
-        let pdu_read_back = MetadataPduReader::from_bytes(&buf).unwrap();
-        compare_read_pdu_to_written_pdu(&metadata_pdu, &pdu_read_back);
-        let opts_iter = pdu_read_back.options_iter();
-        assert!(opts_iter.is_some());
-        let opts_iter = opts_iter.unwrap();
-        let mut accumulated_len = 0;
-        for (idx, opt) in opts_iter.enumerate() {
-            if idx == 0 {
-                assert_eq!(tlv1, opt);
-            } else if idx == 1 {
-                assert_eq!(tlv2, opt);
-            }
             accumulated_len += opt.len_full();
         }
         assert_eq!(accumulated_len, pdu_read_back.options().len());
@@ -780,7 +713,7 @@ pub mod tests {
             assert_eq!(expected, Some(FileDirectiveType::MetadataPdu));
             assert_eq!(
                 error.to_string(),
-                "invalid directive type, found 255, expected Some(MetadataPdu)"
+                "invalid directive type value 255, expected Some(MetadataPdu)"
             );
         } else {
             panic!("Expected InvalidDirectiveType error, got {:?}", error);
@@ -806,7 +739,7 @@ pub mod tests {
             assert_eq!(expected, FileDirectiveType::MetadataPdu);
             assert_eq!(
                 error.to_string(),
-                "wrong directive type, found EofPdu, expected MetadataPdu"
+                "found directive type EofPdu, expected MetadataPdu"
             );
         } else {
             panic!("Expected InvalidDirectiveType error, got {:?}", error);

src/cfdp/pdu/mod.rs

@@ -5,6 +5,9 @@ use crate::ByteConversionError;
 use crate::CRC_CCITT_FALSE;
 #[cfg(feature = "alloc")]
 use alloc::vec::Vec;
+use core::fmt::{Display, Formatter};
+#[cfg(feature = "std")]
+use std::error::Error;
 
 pub mod ack;
 pub mod eof;
@@ -15,7 +18,6 @@ pub mod nak;
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, TryFromPrimitive, IntoPrimitive)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[repr(u8)]
 pub enum FileDirectiveType {
     EofPdu = 0x04,
@@ -27,62 +29,135 @@ pub enum FileDirectiveType {
     KeepAlivePdu = 0x0c,
 }
 
-#[derive(Debug, Copy, Clone, PartialEq, Eq, thiserror::Error)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum PduError {
-    #[error("byte conversion error: {0}")]
+    ByteConversion(ByteConversionError),
-    ByteConversion(#[from] ByteConversionError),
+    /// Found version ID invalid, not equal to [CFDP_VERSION_2].
-    /// Found version ID invalid, not equal to [super::CFDP_VERSION_2].
-    #[error("CFDP version missmatch, found {0}, expected {ver}", ver = super::CFDP_VERSION_2)]
     CfdpVersionMissmatch(u8),
     /// Invalid length for the entity ID detected. Only the values 1, 2, 4 and 8 are supported.
-    #[error("invalid PDU entity ID length {0}, only [1, 2, 4, 8] are allowed")]
     InvalidEntityLen(u8),
     /// Invalid length for the entity ID detected. Only the values 1, 2, 4 and 8 are supported.
-    #[error("invalid transaction ID length {0}")]
     InvalidTransactionSeqNumLen(u8),
-    #[error(
-        "missmatch of PDU source ID length {src_id_len} and destination ID length {dest_id_len}"
-    )]
     SourceDestIdLenMissmatch {
         src_id_len: usize,
         dest_id_len: usize,
     },
     /// Wrong directive type, for example when parsing the directive field for a file directive
     /// PDU.
-    #[error("wrong directive type, found {found:?}, expected {expected:?}")]
     WrongDirectiveType {
         found: FileDirectiveType,
         expected: FileDirectiveType,
     },
     /// The directive type field contained a value not in the range of permitted values. This can
     /// also happen if an invalid value is passed to the ACK PDU constructor.
-    #[error("invalid directive type, found {found:?}, expected {expected:?}")]
     InvalidDirectiveType {
         found: u8,
         expected: Option<FileDirectiveType>,
     },
-    #[error("invalid start or end of scope value for NAK PDU")]
     InvalidStartOrEndOfScopeValue,
     /// Invalid condition code. Contains the raw detected value.
-    #[error("invalid condition code {0}")]
     InvalidConditionCode(u8),
     /// Invalid checksum type which is not part of the checksums listed in the
     /// [SANA Checksum Types registry](https://sanaregistry.org/r/checksum_identifiers/).
-    #[error("invalid checksum type {0}")]
     InvalidChecksumType(u8),
-    #[error("file size {0} too large")]
     FileSizeTooLarge(u64),
     /// If the CRC flag for a PDU is enabled and the checksum check fails. Contains raw 16-bit CRC.
-    #[error("checksum error for checksum {0}")]
+    ChecksumError(u16),
-    Checksum(u16),
     /// Generic error for invalid PDU formats.
-    #[error("generic PDU format error")]
+    FormatError,
-    Format,
     /// Error handling a TLV field.
-    #[error("PDU error: {0}")]
+    TlvLvError(TlvLvError),
-    TlvLv(#[from] TlvLvError),
+}
+
+impl Display for PduError {
+    fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
+        match self {
+            PduError::InvalidEntityLen(raw_id) => {
+                write!(
+                    f,
+                    "invalid PDU entity ID length {raw_id}, only [1, 2, 4, 8] are allowed"
+                )
+            }
+            PduError::InvalidStartOrEndOfScopeValue => {
+                write!(f, "invalid start or end of scope for NAK PDU")
+            }
+            PduError::InvalidTransactionSeqNumLen(raw_id) => {
+                write!(
+                    f,
+                    "invalid PDUtransaction seq num length {raw_id}, only [1, 2, 4, 8] are allowed"
+                )
+            }
+            PduError::CfdpVersionMissmatch(raw) => {
+                write!(
+                    f,
+                    "cfdp version missmatch, found {raw}, expected {CFDP_VERSION_2}"
+                )
+            }
+            PduError::SourceDestIdLenMissmatch {
+                src_id_len,
+                dest_id_len,
+            } => {
+                write!(
+                    f,
+                    "missmatch of PDU source length {src_id_len} and destination length {dest_id_len}"
+                )
+            }
+            PduError::ByteConversion(e) => {
+                write!(f, "{}", e)
+            }
+            PduError::FileSizeTooLarge(value) => {
+                write!(f, "file size value {value} exceeds allowed 32 bit width")
+            }
+            PduError::WrongDirectiveType { found, expected } => {
+                write!(f, "found directive type {found:?}, expected {expected:?}")
+            }
+            PduError::InvalidConditionCode(raw_code) => {
+                write!(f, "found invalid condition code with raw value {raw_code}")
+            }
+            PduError::InvalidDirectiveType { found, expected } => {
+                write!(
+                    f,
+                    "invalid directive type value {found}, expected {expected:?}"
+                )
+            }
+            PduError::InvalidChecksumType(checksum_type) => {
+                write!(f, "invalid checksum type {checksum_type}")
+            }
+            PduError::ChecksumError(checksum) => {
+                write!(f, "checksum error for CRC {checksum:#04x}")
+            }
+            PduError::TlvLvError(error) => {
+                write!(f, "pdu tlv error: {error}")
+            }
+            PduError::FormatError => {
+                write!(f, "generic PDU format error")
+            }
+        }
+    }
+}
+
+#[cfg(feature = "std")]
+impl Error for PduError {
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+        match self {
+            PduError::ByteConversion(e) => Some(e),
+            PduError::TlvLvError(e) => Some(e),
+            _ => None,
+        }
+    }
+}
+
+impl From<ByteConversionError> for PduError {
+    fn from(value: ByteConversionError) -> Self {
+        Self::ByteConversion(value)
+    }
+}
+
+impl From<TlvLvError> for PduError {
+    fn from(e: TlvLvError) -> Self {
+        Self::TlvLvError(e)
+    }
 }
 
 pub trait WritablePduPacket {
@@ -103,42 +178,33 @@ pub trait WritablePduPacket {
 pub trait CfdpPdu {
     fn pdu_header(&self) -> &PduHeader;
 
-    #[inline]
     fn source_id(&self) -> UnsignedByteField {
         self.pdu_header().common_pdu_conf().source_entity_id
     }
 
-    #[inline]
     fn dest_id(&self) -> UnsignedByteField {
         self.pdu_header().common_pdu_conf().dest_entity_id
     }
 
-    #[inline]
     fn transaction_seq_num(&self) -> UnsignedByteField {
         self.pdu_header().common_pdu_conf().transaction_seq_num
     }
 
-    #[inline]
     fn transmission_mode(&self) -> TransmissionMode {
         self.pdu_header().common_pdu_conf().trans_mode
     }
-
-    #[inline]
     fn direction(&self) -> Direction {
         self.pdu_header().common_pdu_conf().direction
     }
 
-    #[inline]
     fn crc_flag(&self) -> CrcFlag {
         self.pdu_header().common_pdu_conf().crc_flag
     }
 
-    #[inline]
     fn file_flag(&self) -> LargeFileFlag {
         self.pdu_header().common_pdu_conf().file_flag
     }
 
-    #[inline]
     fn pdu_type(&self) -> PduType {
         self.pdu_header().pdu_type()
     }
@@ -154,7 +220,6 @@ pub trait CfdpPdu {
 /// same.
 #[derive(Debug, Copy, Clone, Eq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct CommonPduConfig {
     source_entity_id: UnsignedByteField,
     dest_entity_id: UnsignedByteField,
@@ -167,7 +232,6 @@ pub struct CommonPduConfig {
 
 // TODO: Builder pattern might be applicable here..
 impl CommonPduConfig {
-    #[inline]
     pub fn new(
         source_id: impl Into<UnsignedByteField>,
         dest_id: impl Into<UnsignedByteField>,
@@ -199,7 +263,6 @@ impl CommonPduConfig {
         })
     }
 
-    #[inline]
     pub fn new_with_byte_fields(
         source_id: impl Into<UnsignedByteField>,
         dest_id: impl Into<UnsignedByteField>,
@@ -216,12 +279,10 @@ impl CommonPduConfig {
         )
     }
 
-    #[inline]
     pub fn source_id(&self) -> UnsignedByteField {
         self.source_entity_id
     }
 
-    #[inline]
     fn source_dest_id_check(
         source_id: impl Into<UnsignedByteField>,
         dest_id: impl Into<UnsignedByteField>,
@@ -244,7 +305,6 @@ impl CommonPduConfig {
         Ok((source_id, dest_id))
     }
 
-    #[inline]
     pub fn set_source_and_dest_id(
         &mut self,
         source_id: impl Into<UnsignedByteField>,
@@ -256,7 +316,6 @@ impl CommonPduConfig {
         Ok(())
     }
 
-    #[inline]
     pub fn dest_id(&self) -> UnsignedByteField {
         self.dest_entity_id
     }
@@ -265,7 +324,6 @@ impl CommonPduConfig {
 impl Default for CommonPduConfig {
     /// The defaults for the source ID, destination ID and the transaction sequence number is the
     /// [UnsignedByteFieldU8] with an intitial value of 0
-    #[inline]
     fn default() -> Self {
         // The new function can not fail for these input parameters.
         Self::new(
@@ -282,7 +340,6 @@ impl Default for CommonPduConfig {
 }
 
 impl PartialEq for CommonPduConfig {
-    #[inline]
     fn eq(&self, other: &Self) -> bool {
         self.source_entity_id.value() == other.source_entity_id.value()
             && self.dest_entity_id.value() == other.dest_entity_id.value()
@@ -301,7 +358,6 @@ pub const FIXED_HEADER_LEN: usize = 4;
 /// For detailed information, refer to chapter 5.1 of the CFDP standard.
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct PduHeader {
     pdu_type: PduType,
     pdu_conf: CommonPduConfig,
@@ -311,7 +367,6 @@ pub struct PduHeader {
 }
 
 impl PduHeader {
-    #[inline]
     pub fn new_for_file_data(
         pdu_conf: CommonPduConfig,
         pdu_datafield_len: u16,
@@ -327,7 +382,6 @@ impl PduHeader {
         )
     }
 
-    #[inline]
     pub fn new_for_file_data_default(pdu_conf: CommonPduConfig, pdu_datafield_len: u16) -> Self {
         Self::new_generic(
             PduType::FileData,
@@ -337,7 +391,6 @@ impl PduHeader {
             SegmentationControl::NoRecordBoundaryPreservation,
         )
     }
-    #[inline]
     pub fn new_no_file_data(pdu_conf: CommonPduConfig, pdu_datafield_len: u16) -> Self {
         Self::new_generic(
             PduType::FileDirective,
@@ -348,7 +401,6 @@ impl PduHeader {
         )
     }
 
-    #[inline]
     pub fn new_generic(
         pdu_type: PduType,
         pdu_conf: CommonPduConfig,
@@ -366,7 +418,6 @@ impl PduHeader {
     }
 
     /// Returns only the length of the PDU header when written to a raw buffer.
-    #[inline]
     pub fn header_len(&self) -> usize {
         FIXED_HEADER_LEN
             + self.pdu_conf.source_entity_id.size()
@@ -374,14 +425,12 @@ impl PduHeader {
             + self.pdu_conf.dest_entity_id.size()
     }
 
-    #[inline]
     pub fn pdu_datafield_len(&self) -> usize {
         self.pdu_datafield_len.into()
     }
 
     /// Returns the full length of the PDU when written to a raw buffer, which is the header length
     /// plus the PDU datafield length.
-    #[inline]
     pub fn pdu_len(&self) -> usize {
         self.header_len() + self.pdu_datafield_len as usize
     }
@@ -454,7 +503,7 @@ impl PduHeader {
             let mut digest = CRC_CCITT_FALSE.digest();
             digest.update(&buf[..self.pdu_len()]);
             if digest.finalize() != 0 {
-                return Err(PduError::Checksum(u16::from_be_bytes(
+                return Err(PduError::ChecksumError(u16::from_be_bytes(
                     buf[self.pdu_len() - 2..self.pdu_len()].try_into().unwrap(),
                 )));
             }
@@ -554,13 +603,10 @@ impl PduHeader {
             current_idx,
         ))
     }
-
-    #[inline]
     pub fn pdu_type(&self) -> PduType {
         self.pdu_type
     }
 
-    #[inline]
     pub fn common_pdu_conf(&self) -> &CommonPduConfig {
         &self.pdu_conf
     }
@@ -568,8 +614,6 @@ impl PduHeader {
     pub fn seg_metadata_flag(&self) -> SegmentMetadataFlag {
         self.seg_metadata_flag
     }
-
-    #[inline]
     pub fn seg_ctrl(&self) -> SegmentationControl {
         self.seg_ctrl
     }
@@ -903,7 +947,7 @@ mod tests {
             assert_eq!(raw_version, CFDP_VERSION_2 + 1);
             assert_eq!(
                 error.to_string(),
-                "CFDP version missmatch, found 2, expected 1"
+                "cfdp version missmatch, found 2, expected 1"
             );
         } else {
             panic!("invalid exception: {}", error);
@@ -951,7 +995,7 @@ mod tests {
             assert_eq!(expected, 7);
             assert_eq!(
                 error.to_string(),
-                "byte conversion error: source slice with size 6 too small, expected at least 7 bytes"
+                "source slice with size 6 too small, expected at least 7 bytes"
             );
         }
     }
@@ -1006,7 +1050,7 @@ mod tests {
             assert_eq!(dest_id_len, 2);
             assert_eq!(
                 error.to_string(),
-                "missmatch of PDU source ID length 1 and destination ID length 2"
+                "missmatch of PDU source length 1 and destination length 2"
             );
         }
     }

src/cfdp/pdu/nak.rs

@@ -12,7 +12,6 @@ use super::{
 /// Helper type to encapsulate both normal file size segment requests and large file size segment
 /// requests.
 #[derive(Debug, PartialEq, Eq, Clone)]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum SegmentRequests<'a> {
     U32Pairs(&'a [(u32, u32)]),
     U64Pairs(&'a [(u64, u64)]),
@@ -32,7 +31,6 @@ impl SegmentRequests<'_> {
 /// It exposes a specialized API which simplifies to generate these NAK PDUs with the
 /// format according to CFDP chapter 5.2.6.
 #[derive(Debug, Clone, PartialEq, Eq)]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct NakPduCreator<'seg_reqs> {
     pdu_header: PduHeader,
     start_of_scope: u64,
@@ -61,7 +59,7 @@ impl<'seg_reqs> NakPduCreator<'seg_reqs> {
         start_of_scope: u32,
         end_of_scope: u32,
         segment_requests: &'seg_reqs [(u32, u32)],
-    ) -> Result<NakPduCreator<'seg_reqs>, PduError> {
+    ) -> Result<NakPduCreator, PduError> {
         let mut passed_segment_requests = None;
         if !segment_requests.is_empty() {
             passed_segment_requests = Some(SegmentRequests::U32Pairs(segment_requests));
@@ -79,7 +77,7 @@ impl<'seg_reqs> NakPduCreator<'seg_reqs> {
         start_of_scope: u64,
         end_of_scope: u64,
         segment_requests: &'seg_reqs [(u64, u64)],
-    ) -> Result<NakPduCreator<'seg_reqs>, PduError> {
+    ) -> Result<NakPduCreator, PduError> {
         let mut passed_segment_requests = None;
         if !segment_requests.is_empty() {
             passed_segment_requests = Some(SegmentRequests::U64Pairs(segment_requests));
@@ -97,7 +95,7 @@ impl<'seg_reqs> NakPduCreator<'seg_reqs> {
         start_of_scope: u64,
         end_of_scope: u64,
         segment_requests: Option<SegmentRequests<'seg_reqs>>,
-    ) -> Result<NakPduCreator<'seg_reqs>, PduError> {
+    ) -> Result<NakPduCreator, PduError> {
         // Force correct direction flag.
         pdu_header.pdu_conf.direction = Direction::TowardsSender;
         if let Some(ref segment_requests) = segment_requests {
@@ -269,7 +267,7 @@ impl SegReqFromBytes for u64 {
     }
 }
 
-impl<T> Iterator for SegmentRequestIter<'_, T>
+impl<'a, T> Iterator for SegmentRequestIter<'a, T>
 where
     T: SegReqFromBytes,
 {
@@ -282,8 +280,8 @@ where
     }
 }
 
-impl<'a> PartialEq<SegmentRequests<'a>> for SegmentRequestIter<'_, u32> {
+impl<'a, 'b> PartialEq<SegmentRequests<'a>> for SegmentRequestIter<'b, u32> {
-    fn eq(&self, other: &SegmentRequests<'a>) -> bool {
+    fn eq(&self, other: &SegmentRequests) -> bool {
         match other {
             SegmentRequests::U32Pairs(pairs) => self.compare_pairs(pairs),
             SegmentRequests::U64Pairs(pairs) => {
@@ -296,8 +294,8 @@ impl<'a> PartialEq<SegmentRequests<'a>> for SegmentRequestIter<'_, u32> {
     }
 }
 
-impl<'a> PartialEq<SegmentRequests<'a>> for SegmentRequestIter<'_, u64> {
+impl<'a, 'b> PartialEq<SegmentRequests<'a>> for SegmentRequestIter<'b, u64> {
-    fn eq(&self, other: &SegmentRequests<'a>) -> bool {
+    fn eq(&self, other: &SegmentRequests) -> bool {
         match other {
             SegmentRequests::U32Pairs(pairs) => {
                 if pairs.is_empty() && self.seq_req_raw.is_empty() {
@@ -310,7 +308,7 @@ impl<'a> PartialEq<SegmentRequests<'a>> for SegmentRequestIter<'_, u64> {
     }
 }
 
-impl<T> SegmentRequestIter<'_, T>
+impl<'a, T> SegmentRequestIter<'a, T>
 where
     T: SegReqFromBytes + PartialEq,
 {
@@ -355,7 +353,6 @@ impl<T: SegReqFromBytes> SegmentRequestIter<'_, T> {
 ///
 /// The NAK format is expected to be conforming to CFDP chapter 5.2.6.
 #[derive(Debug, PartialEq, Eq)]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct NakPduReader<'seg_reqs> {
     pdu_header: PduHeader,
     start_of_scope: u64,
@@ -374,11 +371,11 @@ impl CfdpPdu for NakPduReader<'_> {
 }
 
 impl<'seg_reqs> NakPduReader<'seg_reqs> {
-    pub fn new(buf: &'seg_reqs [u8]) -> Result<NakPduReader<'seg_reqs>, PduError> {
+    pub fn new(buf: &'seg_reqs [u8]) -> Result<NakPduReader, PduError> {
         Self::from_bytes(buf)
     }
 
-    pub fn from_bytes(buf: &'seg_reqs [u8]) -> Result<NakPduReader<'seg_reqs>, PduError> {
+    pub fn from_bytes(buf: &'seg_reqs [u8]) -> Result<NakPduReader, PduError> {
         let (pdu_header, mut current_idx) = PduHeader::from_bytes(buf)?;
         let full_len_without_crc = pdu_header.verify_length_and_checksum(buf)?;
         // Minimum length of 9: 1 byte directive field and start and end of scope for normal file
@@ -474,7 +471,7 @@ impl<'seg_reqs> NakPduReader<'seg_reqs> {
     }
 }
 
-impl<'a> PartialEq<NakPduCreator<'a>> for NakPduReader<'_> {
+impl<'a, 'b> PartialEq<NakPduCreator<'a>> for NakPduReader<'b> {
     fn eq(&self, other: &NakPduCreator<'a>) -> bool {
         if self.pdu_header() != other.pdu_header()
             || self.end_of_scope() != other.end_of_scope()
@@ -751,7 +748,7 @@ mod tests {
         if let PduError::InvalidStartOrEndOfScopeValue = error {
             assert_eq!(
                 error.to_string(),
-                "invalid start or end of scope value for NAK PDU"
+                "invalid start or end of scope for NAK PDU"
             );
         } else {
             panic!("unexpected error {error}");
@@ -796,7 +793,7 @@ mod tests {
         nak_vec[nak_pdu.len_written() - 1] -= 1;
         let nak_pdu_deser = NakPduReader::new(&nak_vec);
         assert!(nak_pdu_deser.is_err());
-        if let Err(PduError::Checksum(raw)) = nak_pdu_deser {
+        if let Err(PduError::ChecksumError(raw)) = nak_pdu_deser {
             assert_eq!(
                 raw,
                 u16::from_be_bytes(nak_vec[nak_pdu.len_written() - 2..].try_into().unwrap())

src/cfdp/tlv/mod.rs

@@ -9,14 +9,10 @@ use crate::ByteConversionError;
 use alloc::vec;
 #[cfg(feature = "alloc")]
 use alloc::vec::Vec;
-#[cfg(feature = "alloc")]
-pub use alloc_mod::*;
 use num_enum::{IntoPrimitive, TryFromPrimitive};
 #[cfg(feature = "serde")]
 use serde::{Deserialize, Serialize};
 
-use super::{InvalidTlvTypeFieldError, TlvLvDataTooLargeError};
-
 pub mod msg_to_user;
 
 pub const MIN_TLV_LEN: usize = 2;
@@ -43,26 +39,6 @@ pub trait GenericTlv {
     }
 }
 
-pub trait ReadableTlv {
-    fn value(&self) -> &[u8];
-
-    /// Checks whether the value field is empty.
-    fn is_empty(&self) -> bool {
-        self.value().is_empty()
-    }
-
-    /// Helper method to retrieve the length of the value. Simply calls the [slice::len] method of
-    /// [Self::value]
-    fn len_value(&self) -> usize {
-        self.value().len()
-    }
-
-    /// Returns the full raw length, including the length byte.
-    fn len_full(&self) -> usize {
-        self.len_value() + 2
-    }
-}
-
 pub trait WritableTlv {
     fn write_to_bytes(&self, buf: &mut [u8]) -> Result<usize, ByteConversionError>;
     fn len_written(&self) -> usize;
@@ -76,7 +52,6 @@ pub trait WritableTlv {
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, TryFromPrimitive, IntoPrimitive)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[repr(u8)]
 pub enum TlvType {
     FilestoreRequest = 0x00,
@@ -89,7 +64,6 @@ pub enum TlvType {
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum TlvTypeField {
     Standard(TlvType),
     Custom(u8),
@@ -97,7 +71,6 @@ pub enum TlvTypeField {
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, TryFromPrimitive, IntoPrimitive)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[repr(u8)]
 pub enum FilestoreActionCode {
     CreateFile = 0b0000,
@@ -145,7 +118,6 @@ impl From<TlvTypeField> for u8 {
 ///    this will be the lifetime of that data reference.
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct Tlv<'data> {
     tlv_type_field: TlvTypeField,
     #[cfg_attr(feature = "serde", serde(borrow))]
@@ -153,14 +125,14 @@ pub struct Tlv<'data> {
 }
 
 impl<'data> Tlv<'data> {
-    pub fn new(tlv_type: TlvType, data: &[u8]) -> Result<Tlv, TlvLvDataTooLargeError> {
+    pub fn new(tlv_type: TlvType, data: &[u8]) -> Result<Tlv, TlvLvError> {
         Ok(Tlv {
             tlv_type_field: TlvTypeField::Standard(tlv_type),
             lv: Lv::new(data)?,
         })
     }
 
-    pub fn new_with_custom_type(tlv_type: u8, data: &[u8]) -> Result<Tlv, TlvLvDataTooLargeError> {
+    pub fn new_with_custom_type(tlv_type: u8, data: &[u8]) -> Result<Tlv, TlvLvError> {
         Ok(Tlv {
             tlv_type_field: TlvTypeField::Custom(tlv_type),
             lv: Lv::new(data)?,
@@ -175,11 +147,31 @@ impl<'data> Tlv<'data> {
         }
     }
 
+    pub fn value(&self) -> &[u8] {
+        self.lv.value()
+    }
+
+    /// Checks whether the value field is empty.
+    pub fn is_empty(&self) -> bool {
+        self.value().is_empty()
+    }
+
+    /// Helper method to retrieve the length of the value. Simply calls the [slice::len] method of
+    /// [Self::value]
+    pub fn len_value(&self) -> usize {
+        self.value().len()
+    }
+
+    /// Returns the full raw length, including the length byte.
+    pub fn len_full(&self) -> usize {
+        self.len_value() + 2
+    }
+
     /// Creates a TLV give a raw bytestream. Please note that is is not necessary to pass the
     /// bytestream with the exact size of the expected TLV. This function will take care
     /// of parsing the length byte, and the length of the parsed TLV can be retrieved using
     /// [Self::len_full].
-    pub fn from_bytes(buf: &'data [u8]) -> Result<Tlv<'data>, ByteConversionError> {
+    pub fn from_bytes(buf: &'data [u8]) -> Result<Tlv<'data>, TlvLvError> {
         generic_len_check_deserialization(buf, MIN_TLV_LEN)?;
         let mut tlv = Self {
             tlv_type_field: TlvTypeField::from(buf[0]),
@@ -196,27 +188,6 @@ impl<'data> Tlv<'data> {
     pub fn raw_data(&self) -> Option<&[u8]> {
         self.lv.raw_data()
     }
-
-    #[cfg(feature = "alloc")]
-    pub fn to_owned(&self) -> TlvOwned {
-        TlvOwned {
-            tlv_type_field: self.tlv_type_field,
-            data: self.value().to_vec(),
-        }
-    }
-}
-
-#[cfg(feature = "alloc")]
-impl PartialEq<TlvOwned> for Tlv<'_> {
-    fn eq(&self, other: &TlvOwned) -> bool {
-        self.tlv_type_field == other.tlv_type_field && self.value() == other.value()
-    }
-}
-
-impl ReadableTlv for Tlv<'_> {
-    fn value(&self) -> &[u8] {
-        self.lv.value()
-    }
 }
 
 impl WritableTlv for Tlv<'_> {
@@ -237,95 +208,22 @@ impl GenericTlv for Tlv<'_> {
     }
 }
 
-#[cfg(feature = "alloc")]
+pub(crate) fn verify_tlv_type(raw_type: u8, expected_tlv_type: TlvType) -> Result<(), TlvLvError> {
-pub mod alloc_mod {
+    let tlv_type = TlvType::try_from(raw_type).map_err(|_| TlvLvError::InvalidTlvTypeField {
-    use super::*;
+        found: raw_type,
-
+        expected: Some(expected_tlv_type.into()),
-    /// Owned variant of [Tlv] which is consequently [Clone]able and does not have a lifetime
+    })?;
-    /// associated to a data slice.
+    if tlv_type != expected_tlv_type {
-    #[derive(Debug, Clone, PartialEq, Eq)]
+        return Err(TlvLvError::InvalidTlvTypeField {
-    #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+            found: tlv_type as u8,
-    #[cfg_attr(feature = "defmt", derive(defmt::Format))]
+            expected: Some(expected_tlv_type as u8),
-    pub struct TlvOwned {
+        });
-        pub(crate) tlv_type_field: TlvTypeField,
-        pub(crate) data: Vec<u8>,
-    }
-
-    impl TlvOwned {
-        pub fn new(tlv_type: TlvType, data: &[u8]) -> Self {
-            Self {
-                tlv_type_field: TlvTypeField::Standard(tlv_type),
-                data: data.to_vec(),
-            }
-        }
-
-        pub fn new_with_custom_type(tlv_type: u8, data: &[u8]) -> Self {
-            Self {
-                tlv_type_field: TlvTypeField::Custom(tlv_type),
-                data: data.to_vec(),
-            }
-        }
-
-        /// Creates a TLV with an empty value field.
-        pub fn new_empty(tlv_type: TlvType) -> Self {
-            Self {
-                tlv_type_field: TlvTypeField::Standard(tlv_type),
-                data: Vec::new(),
-            }
-        }
-
-        pub fn as_tlv(&self) -> Tlv<'_> {
-            Tlv {
-                tlv_type_field: self.tlv_type_field,
-                // The API should ensure that the data length is never to large, so the unwrap for the
-                // LV creation should never be an issue.
-                lv: Lv::new(&self.data).expect("lv creation failed unexpectedly"),
-            }
-        }
-    }
-
-    impl ReadableTlv for TlvOwned {
-        fn value(&self) -> &[u8] {
-            &self.data
-        }
-    }
-
-    impl WritableTlv for TlvOwned {
-        fn write_to_bytes(&self, buf: &mut [u8]) -> Result<usize, ByteConversionError> {
-            generic_len_check_data_serialization(buf, self.data.len(), MIN_TLV_LEN)?;
-            buf[0] = self.tlv_type_field.into();
-            buf[1] = self.data.len() as u8;
-            buf[2..2 + self.data.len()].copy_from_slice(&self.data);
-            Ok(self.len_written())
-        }
-
-        fn len_written(&self) -> usize {
-            self.data.len() + 2
-        }
-    }
-
-    impl GenericTlv for TlvOwned {
-        fn tlv_type_field(&self) -> TlvTypeField {
-            self.tlv_type_field
-        }
-    }
-
-    impl From<Tlv<'_>> for TlvOwned {
-        fn from(value: Tlv<'_>) -> Self {
-            value.to_owned()
-        }
-    }
-
-    impl PartialEq<Tlv<'_>> for TlvOwned {
-        fn eq(&self, other: &Tlv) -> bool {
-            self.tlv_type_field == other.tlv_type_field && self.data == other.value()
-        }
     }
+    Ok(())
 }
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct EntityIdTlv {
     entity_id: UnsignedByteField,
 }
@@ -374,8 +272,11 @@ impl EntityIdTlv {
         Self::len_check(buf)?;
         self.entity_id
             .write_to_be_bytes(&mut buf[2..2 + self.entity_id.size()])?;
-        // Can't fail.
+        Tlv::new(TlvType::EntityId, &buf[2..2 + self.entity_id.size()]).map_err(|e| match e {
-        Ok(Tlv::new(TlvType::EntityId, &buf[2..2 + self.entity_id.size()]).unwrap())
+            TlvLvError::ByteConversion(e) => e,
+            // All other errors are impossible.
+            _ => panic!("unexpected TLV error"),
+        })
     }
 }
 
@@ -398,26 +299,24 @@ impl GenericTlv for EntityIdTlv {
     }
 }
 
-impl TryFrom<Tlv<'_>> for EntityIdTlv {
+impl<'data> TryFrom<Tlv<'data>> for EntityIdTlv {
     type Error = TlvLvError;
 
-    fn try_from(value: Tlv) -> Result<Self, TlvLvError> {
+    fn try_from(value: Tlv) -> Result<Self, Self::Error> {
         match value.tlv_type_field {
             TlvTypeField::Standard(tlv_type) => {
                 if tlv_type != TlvType::EntityId {
-                    return Err(InvalidTlvTypeFieldError {
+                    return Err(TlvLvError::InvalidTlvTypeField {
                         found: tlv_type as u8,
                         expected: Some(TlvType::EntityId as u8),
-                    }
+                    });
-                    .into());
                 }
             }
             TlvTypeField::Custom(val) => {
-                return Err(InvalidTlvTypeFieldError {
+                return Err(TlvLvError::InvalidTlvTypeField {
                     found: val,
                     expected: Some(TlvType::EntityId as u8),
-                }
+                });
-                .into());
             }
         }
         let len_value = value.value().len();
@@ -449,7 +348,6 @@ pub fn fs_request_has_second_filename(action_code: FilestoreActionCode) -> bool
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 struct FilestoreTlvBase<'first_name, 'second_name> {
     pub action_code: FilestoreActionCode,
     #[cfg_attr(feature = "serde", serde(borrow))]
@@ -663,7 +561,6 @@ impl GenericTlv for FilestoreRequestTlv<'_, '_> {
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct FilestoreResponseTlv<'first_name, 'second_name, 'fs_msg> {
     #[cfg_attr(feature = "serde", serde(borrow))]
     base: FilestoreTlvBase<'first_name, 'second_name>,
@@ -848,23 +745,6 @@ impl GenericTlv for FilestoreResponseTlv<'_, '_, '_> {
     }
 }
 
-pub(crate) fn verify_tlv_type(
-    raw_type: u8,
-    expected_tlv_type: TlvType,
-) -> Result<(), InvalidTlvTypeFieldError> {
-    let tlv_type = TlvType::try_from(raw_type).map_err(|_| InvalidTlvTypeFieldError {
-        found: raw_type,
-        expected: Some(expected_tlv_type.into()),
-    })?;
-    if tlv_type != expected_tlv_type {
-        return Err(InvalidTlvTypeFieldError {
-            found: tlv_type as u8,
-            expected: Some(expected_tlv_type as u8),
-        });
-    }
-    Ok(())
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -1052,14 +932,14 @@ mod tests {
         let tlv_res = Tlv::new(TlvType::MsgToUser, &buf_too_large);
         assert!(tlv_res.is_err());
         let error = tlv_res.unwrap_err();
-        match error {
+        if let TlvLvError::DataTooLarge(size) = error {
-            TlvLvDataTooLargeError(size) => {
             assert_eq!(size, u8::MAX as usize + 1);
             assert_eq!(
                 error.to_string(),
                 "data with size 256 larger than allowed 255 bytes"
             );
-            }
+        } else {
+            panic!("unexpected error {:?}", error);
         }
     }
 
@@ -1369,8 +1249,7 @@ mod tests {
         let error = EntityIdTlv::try_from(msg_to_user_tlv);
         assert!(error.is_err());
         let error = error.unwrap_err();
-        if let TlvLvError::InvalidTlvTypeField(InvalidTlvTypeFieldError { found, expected }) = error
+        if let TlvLvError::InvalidTlvTypeField { found, expected } = error {
-        {
             assert_eq!(found, TlvType::MsgToUser as u8);
             assert_eq!(expected, Some(TlvType::EntityId as u8));
             assert_eq!(
@@ -1414,71 +1293,4 @@ mod tests {
         assert_eq!(tlv_as_vec[0], 20);
         assert_eq!(tlv_as_vec[1], 0);
     }
-
-    #[test]
-    fn test_tlv_to_owned() {
-        let entity_id = UbfU8::new(5);
-        let mut buf: [u8; 4] = [0; 4];
-        assert!(entity_id.write_to_be_bytes(&mut buf).is_ok());
-        let tlv_res = Tlv::new(TlvType::EntityId, &buf[0..1]);
-        assert!(tlv_res.is_ok());
-        let tlv_res = tlv_res.unwrap();
-        let tlv_owned = tlv_res.to_owned();
-        assert_eq!(tlv_res, tlv_owned);
-        let tlv_owned_from_conversion: TlvOwned = tlv_res.into();
-        assert_eq!(tlv_owned_from_conversion, tlv_owned);
-        assert_eq!(tlv_owned_from_conversion, tlv_res);
-    }
-
-    #[test]
-    fn test_owned_tlv() {
-        let entity_id = UbfU8::new(5);
-        let mut buf: [u8; 4] = [0; 4];
-        assert!(entity_id.write_to_be_bytes(&mut buf).is_ok());
-        let tlv_res = TlvOwned::new(TlvType::EntityId, &buf[0..1]);
-        assert_eq!(
-            tlv_res.tlv_type_field(),
-            TlvTypeField::Standard(TlvType::EntityId)
-        );
-        assert_eq!(tlv_res.len_full(), 3);
-        assert_eq!(tlv_res.value().len(), 1);
-        assert_eq!(tlv_res.len_value(), 1);
-        assert!(!tlv_res.is_empty());
-        assert_eq!(tlv_res.value()[0], 5);
-    }
-
-    #[test]
-    fn test_owned_tlv_empty() {
-        let tlv_res = TlvOwned::new_empty(TlvType::FlowLabel);
-        assert_eq!(
-            tlv_res.tlv_type_field(),
-            TlvTypeField::Standard(TlvType::FlowLabel)
-        );
-        assert_eq!(tlv_res.len_full(), 2);
-        assert_eq!(tlv_res.value().len(), 0);
-        assert_eq!(tlv_res.len_value(), 0);
-        assert!(tlv_res.is_empty());
-    }
-
-    #[test]
-    fn test_owned_tlv_custom_type() {
-        let tlv_res = TlvOwned::new_with_custom_type(32, &[]);
-        assert_eq!(tlv_res.tlv_type_field(), TlvTypeField::Custom(32));
-        assert_eq!(tlv_res.len_full(), 2);
-        assert_eq!(tlv_res.value().len(), 0);
-        assert_eq!(tlv_res.len_value(), 0);
-        assert!(tlv_res.is_empty());
-    }
-
-    #[test]
-    fn test_owned_tlv_conversion_to_bytes() {
-        let entity_id = UbfU8::new(5);
-        let mut buf: [u8; 4] = [0; 4];
-        assert!(entity_id.write_to_be_bytes(&mut buf).is_ok());
-        let tlv_res = Tlv::new(TlvType::EntityId, &buf[0..1]);
-        assert!(tlv_res.is_ok());
-        let tlv_res = tlv_res.unwrap();
-        let tlv_owned_from_conversion: TlvOwned = tlv_res.into();
-        assert_eq!(tlv_res.to_vec(), tlv_owned_from_conversion.to_vec());
-    }
 }

src/cfdp/tlv/msg_to_user.rs

@@ -1,11 +1,6 @@
 //! Abstractions for the Message to User CFDP TLV subtype.
-#[cfg(feature = "alloc")]
+use super::{GenericTlv, Tlv, TlvLvError, TlvType, TlvTypeField, WritableTlv};
-use super::TlvOwned;
+use crate::ByteConversionError;
-use super::{GenericTlv, ReadableTlv, Tlv, TlvLvError, TlvType, TlvTypeField, WritableTlv};
-use crate::{
-    cfdp::{InvalidTlvTypeFieldError, TlvLvDataTooLargeError},
-    ByteConversionError,
-};
 use delegate::delegate;
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
@@ -15,7 +10,7 @@ pub struct MsgToUserTlv<'data> {
 
 impl<'data> MsgToUserTlv<'data> {
     /// Create a new message to user TLV where the type field is set correctly.
-    pub fn new(value: &'data [u8]) -> Result<MsgToUserTlv<'data>, TlvLvDataTooLargeError> {
+    pub fn new(value: &'data [u8]) -> Result<MsgToUserTlv<'data>, TlvLvError> {
         Ok(Self {
             tlv: Tlv::new(TlvType::MsgToUser, value)?,
         })
@@ -65,38 +60,21 @@ impl<'data> MsgToUserTlv<'data> {
         match msg_to_user.tlv.tlv_type_field() {
             TlvTypeField::Standard(tlv_type) => {
                 if tlv_type != TlvType::MsgToUser {
-                    return Err(InvalidTlvTypeFieldError {
+                    return Err(TlvLvError::InvalidTlvTypeField {
                         found: tlv_type as u8,
                         expected: Some(TlvType::MsgToUser as u8),
-                    }
+                    });
-                    .into());
                 }
             }
             TlvTypeField::Custom(raw) => {
-                return Err(InvalidTlvTypeFieldError {
+                return Err(TlvLvError::InvalidTlvTypeField {
                     found: raw,
                     expected: Some(TlvType::MsgToUser as u8),
-                }
+                });
-                .into());
             }
         }
         Ok(msg_to_user)
     }
-
-    pub fn to_tlv(&self) -> Tlv<'data> {
-        self.tlv
-    }
-
-    #[cfg(feature = "alloc")]
-    pub fn to_owned(&self) -> TlvOwned {
-        self.tlv.to_owned()
-    }
-}
-
-impl<'a> From<MsgToUserTlv<'a>> for Tlv<'a> {
-    fn from(value: MsgToUserTlv<'a>) -> Tlv<'a> {
-        value.to_tlv()
-    }
 }
 
 impl WritableTlv for MsgToUserTlv<'_> {
@@ -161,40 +139,6 @@ mod tests {
         );
     }
 
-    #[test]
-    fn test_msg_to_user_type_reduction() {
-        let custom_value: [u8; 4] = [1, 2, 3, 4];
-        let msg_to_user = MsgToUserTlv::new(&custom_value).unwrap();
-        let tlv = msg_to_user.to_tlv();
-        assert_eq!(
-            tlv.tlv_type_field(),
-            TlvTypeField::Standard(TlvType::MsgToUser)
-        );
-
-        assert_eq!(tlv.value(), custom_value);
-    }
-
-    #[test]
-    fn test_msg_to_user_to_tlv() {
-        let custom_value: [u8; 4] = [1, 2, 3, 4];
-        let msg_to_user = MsgToUserTlv::new(&custom_value).unwrap();
-        let tlv: Tlv = msg_to_user.into();
-        assert_eq!(msg_to_user.to_tlv(), tlv);
-    }
-
-    #[test]
-    fn test_msg_to_user_owner_converter() {
-        let custom_value: [u8; 4] = [1, 2, 3, 4];
-        let msg_to_user = MsgToUserTlv::new(&custom_value).unwrap();
-        let tlv = msg_to_user.to_owned();
-        assert_eq!(
-            tlv.tlv_type_field(),
-            TlvTypeField::Standard(TlvType::MsgToUser)
-        );
-
-        assert_eq!(tlv.value(), custom_value);
-    }
-
     #[test]
     fn test_reserved_msg_deserialization() {
         let custom_value: [u8; 3] = [1, 2, 3];
@@ -210,9 +154,9 @@ mod tests {
     fn test_reserved_msg_deserialization_invalid_type() {
         let trash: [u8; 5] = [TlvType::FlowLabel as u8, 3, 1, 2, 3];
         let error = MsgToUserTlv::from_bytes(&trash).unwrap_err();
-        if let TlvLvError::InvalidTlvTypeField(inner) = error {
+        if let TlvLvError::InvalidTlvTypeField { found, expected } = error {
-            assert_eq!(inner.found, TlvType::FlowLabel as u8);
+            assert_eq!(found, TlvType::FlowLabel as u8);
-            assert_eq!(inner.expected, Some(TlvType::MsgToUser as u8));
+            assert_eq!(expected, Some(TlvType::MsgToUser as u8));
         } else {
             panic!("Wrong error type returned: {:?}", error);
         }

src/ecss/hk.rs

@@ -5,7 +5,6 @@ use serde::{Deserialize, Serialize};
 
 #[derive(Debug, Eq, PartialEq, Copy, Clone, IntoPrimitive, TryFromPrimitive)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[repr(u8)]
 pub enum Subservice {
     // Regular HK

src/ecss/mod.rs

@@ -1,16 +1,18 @@
 //! Common definitions and helpers required to create PUS TMTC packets according to
 //! [ECSS-E-ST-70-41C](https://ecss.nl/standard/ecss-e-st-70-41c-space-engineering-telemetry-and-telecommand-packet-utilization-15-april-2016/)
 //!
-//! You can find the PUS telecommand types in the [tc] module and the the PUS telemetry
+//! You can find the PUS telecommand definitions in the [tc] module and ithe PUS telemetry definitions
-//! types inside the [tm] module.
+//! inside the [tm] module.
 use crate::{ByteConversionError, CcsdsPacket, CRC_CCITT_FALSE};
 #[cfg(feature = "alloc")]
 use alloc::vec::Vec;
-use core::fmt::Debug;
+use core::fmt::{Debug, Display, Formatter};
 use core::mem::size_of;
 use num_enum::{IntoPrimitive, TryFromPrimitive};
 #[cfg(feature = "serde")]
 use serde::{Deserialize, Serialize};
+#[cfg(feature = "std")]
+use std::error::Error;
 
 pub mod event;
 pub mod hk;
@@ -20,6 +22,7 @@ pub mod tm;
 pub mod verification;
 
 pub type CrcType = u16;
+pub const CCSDS_HEADER_LEN: usize = size_of::<crate::zc::SpHeader>();
 
 #[derive(Debug, Copy, Clone, Eq, PartialEq, IntoPrimitive, TryFromPrimitive)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
@@ -71,7 +74,6 @@ pub enum PusServiceId {
 /// All PUS versions. Only PUS C is supported by this library.
 #[derive(PartialEq, Eq, Copy, Clone, Debug)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[non_exhaustive]
 pub enum PusVersion {
     EsaPus = 0,
@@ -146,19 +148,49 @@ pub enum PfcReal {
     DoubleMilStd = 4,
 }
 
-#[derive(Debug, Copy, Clone, PartialEq, Eq, thiserror::Error)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum PusError {
-    #[error("PUS version {0:?} not supported")]
     VersionNotSupported(PusVersion),
-    #[error("checksum verification for crc16 {0:#06x} failed")]
     ChecksumFailure(u16),
     /// CRC16 needs to be calculated first
-    //#[error("crc16 was not calculated")]
+    CrcCalculationMissing,
-    //CrcCalculationMissing,
+    ByteConversion(ByteConversionError),
-    #[error("pus error: {0}")]
+}
-    ByteConversion(#[from] ByteConversionError),
+
+impl Display for PusError {
+    fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
+        match self {
+            PusError::VersionNotSupported(v) => {
+                write!(f, "PUS version {v:?} not supported")
+            }
+            PusError::ChecksumFailure(crc) => {
+                write!(f, "checksum verification for crc16 {crc:#06x} failed")
+            }
+            PusError::CrcCalculationMissing => {
+                write!(f, "crc16 was not calculated")
+            }
+            PusError::ByteConversion(e) => {
+                write!(f, "pus error: {e}")
+            }
+        }
+    }
+}
+
+#[cfg(feature = "std")]
+impl Error for PusError {
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+        if let PusError::ByteConversion(e) = self {
+            return Some(e);
+        }
+        None
+    }
+}
+
+impl From<ByteConversionError> for PusError {
+    fn from(e: ByteConversionError) -> Self {
+        PusError::ByteConversion(e)
+    }
 }
 
 /// Generic trait to describe common attributes for both PUS Telecommands (TC) and PUS Telemetry
@@ -173,12 +205,13 @@ pub trait PusPacket: CcsdsPacket {
     fn crc16(&self) -> Option<u16>;
 }
 
-pub(crate) fn crc_from_raw_data(raw_data: &[u8]) -> Result<u16, ByteConversionError> {
+pub(crate) fn crc_from_raw_data(raw_data: &[u8]) -> Result<u16, PusError> {
     if raw_data.len() < 2 {
         return Err(ByteConversionError::FromSliceTooSmall {
             found: raw_data.len(),
             expected: 2,
-        });
+        }
+        .into());
     }
     Ok(u16::from_be_bytes(
         raw_data[raw_data.len() - 2..raw_data.len()]
@@ -193,16 +226,35 @@ pub(crate) fn calc_pus_crc16(bytes: &[u8]) -> u16 {
     digest.finalize()
 }
 
+pub(crate) fn crc_procedure(
+    calc_on_serialization: bool,
+    cached_crc16: &Option<u16>,
+    start_idx: usize,
+    curr_idx: usize,
+    slice: &[u8],
+) -> Result<u16, PusError> {
+    let crc16;
+    if calc_on_serialization {
+        crc16 = calc_pus_crc16(&slice[start_idx..curr_idx])
+    } else if cached_crc16.is_none() {
+        return Err(PusError::CrcCalculationMissing);
+    } else {
+        crc16 = cached_crc16.unwrap();
+    }
+    Ok(crc16)
+}
+
 pub(crate) fn user_data_from_raw(
     current_idx: usize,
     total_len: usize,
     slice: &[u8],
-) -> Result<&[u8], ByteConversionError> {
+) -> Result<&[u8], PusError> {
     match current_idx {
         _ if current_idx > total_len - 2 => Err(ByteConversionError::FromSliceTooSmall {
             found: total_len - 2,
             expected: current_idx,
-        }),
+        }
+        .into()),
         _ => Ok(&slice[current_idx..total_len - 2]),
     }
 }
@@ -212,7 +264,7 @@ pub(crate) fn verify_crc16_ccitt_false_from_raw_to_pus_error(
     crc16: u16,
 ) -> Result<(), PusError> {
     verify_crc16_ccitt_false_from_raw(raw_data)
-        .then_some(())
+        .then(|| ())
         .ok_or(PusError::ChecksumFailure(crc16))
 }
 
@@ -228,13 +280,9 @@ pub(crate) fn verify_crc16_ccitt_false_from_raw(raw_data: &[u8]) -> bool {
 macro_rules! ccsds_impl {
     () => {
         delegate!(to self.sp_header {
-            #[inline]
             fn ccsds_version(&self) -> u8;
-            #[inline]
             fn packet_id(&self) -> crate::PacketId;
-            #[inline]
             fn psc(&self) -> crate::PacketSequenceCtrl;
-            #[inline]
             fn data_len(&self) -> u16;
         });
     }
@@ -243,11 +291,8 @@ macro_rules! ccsds_impl {
 macro_rules! sp_header_impls {
     () => {
         delegate!(to self.sp_header {
-            #[inline]
             pub fn set_apid(&mut self, apid: u16) -> bool;
-            #[inline]
             pub fn set_seq_count(&mut self, seq_count: u16) -> bool;
-            #[inline]
             pub fn set_seq_flags(&mut self, seq_flag: SequenceFlags);
         });
     }

src/ecss/scheduling.rs

@@ -54,7 +54,6 @@ pub enum SchedStatus {
 }
 
 impl From<bool> for SchedStatus {
-    #[inline]
     fn from(value: bool) -> Self {
         if value {
             SchedStatus::Enabled

src/ecss/tc.rs

@@ -9,11 +9,9 @@
 //! use spacepackets::ecss::tc::{PusTcCreator, PusTcReader, PusTcSecondaryHeader};
 //!
 //! // Create a ping telecommand with no user application data
-//! let pus_tc = PusTcCreator::new_no_app_data(
+//! let mut sph = SpHeader::tc_unseg(0x02, 0x34, 0).unwrap();
-//!     SpHeader::new_from_apid(0x02),
+//! let tc_header = PusTcSecondaryHeader::new_simple(17, 1);
-//!     PusTcSecondaryHeader::new_simple(17, 1),
+//! let pus_tc = PusTcCreator::new_no_app_data(&mut sph, tc_header, true);
-//!     true
-//! );
 //! println!("{:?}", pus_tc);
 //! assert_eq!(pus_tc.service(), 17);
 //! assert_eq!(pus_tc.subservice(), 1);
@@ -45,11 +43,13 @@ use delegate::delegate;
 use num_enum::{IntoPrimitive, TryFromPrimitive};
 #[cfg(feature = "serde")]
 use serde::{Deserialize, Serialize};
-use zerocopy::{FromBytes, IntoBytes};
+use zerocopy::AsBytes;
 
 #[cfg(feature = "alloc")]
 use alloc::vec::Vec;
 
+pub use legacy_tc::*;
+
 /// PUS C secondary header length is fixed
 pub const PUC_TC_SECONDARY_HEADER_LEN: usize = size_of::<zc::PusTcSecondaryHeader>();
 pub const PUS_TC_MIN_LEN_WITHOUT_APP_DATA: usize =
@@ -61,7 +61,6 @@ pub trait IsPusTelecommand {}
 
 #[derive(Debug, Eq, PartialEq, Copy, Clone, IntoPrimitive, TryFromPrimitive)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[repr(u8)]
 enum AckOpts {
     Acceptance = 0b1000,
@@ -86,9 +85,9 @@ pub trait GenericPusTcSecondaryHeader {
 pub mod zc {
     use crate::ecss::tc::GenericPusTcSecondaryHeader;
     use crate::ecss::{PusError, PusVersion};
-    use zerocopy::{FromBytes, Immutable, IntoBytes, NetworkEndian, Unaligned, U16};
+    use zerocopy::{AsBytes, FromBytes, FromZeroes, NetworkEndian, Unaligned, U16};
 
-    #[derive(FromBytes, IntoBytes, Immutable, Unaligned)]
+    #[derive(FromZeroes, FromBytes, AsBytes, Unaligned)]
     #[repr(C)]
     pub struct PusTcSecondaryHeader {
         version_ack: u8,
@@ -113,36 +112,40 @@ pub mod zc {
     }
 
     impl GenericPusTcSecondaryHeader for PusTcSecondaryHeader {
-        #[inline]
         fn pus_version(&self) -> PusVersion {
-            PusVersion::try_from((self.version_ack >> 4) & 0b1111).unwrap_or(PusVersion::Invalid)
+            PusVersion::try_from(self.version_ack >> 4 & 0b1111).unwrap_or(PusVersion::Invalid)
         }
 
-        #[inline]
         fn ack_flags(&self) -> u8 {
             self.version_ack & 0b1111
         }
 
-        #[inline]
         fn service(&self) -> u8 {
             self.service
         }
 
-        #[inline]
         fn subservice(&self) -> u8 {
             self.subservice
         }
 
-        #[inline]
         fn source_id(&self) -> u16 {
             self.source_id.get()
         }
     }
+
+    impl PusTcSecondaryHeader {
+        pub fn write_to_bytes(&self, slice: &mut [u8]) -> Option<()> {
+            self.write_to(slice)
+        }
+
+        pub fn from_bytes(slice: &[u8]) -> Option<Self> {
+            Self::read_from(slice)
+        }
+    }
 }
 
 #[derive(PartialEq, Eq, Copy, Clone, Debug)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct PusTcSecondaryHeader {
     pub service: u8,
     pub subservice: u8,
@@ -152,27 +155,22 @@ pub struct PusTcSecondaryHeader {
 }
 
 impl GenericPusTcSecondaryHeader for PusTcSecondaryHeader {
-    #[inline]
     fn pus_version(&self) -> PusVersion {
         self.version
     }
 
-    #[inline]
     fn ack_flags(&self) -> u8 {
         self.ack
     }
 
-    #[inline]
     fn service(&self) -> u8 {
         self.service
     }
 
-    #[inline]
     fn subservice(&self) -> u8 {
         self.subservice
     }
 
-    #[inline]
     fn source_id(&self) -> u16 {
         self.source_id
     }
@@ -193,7 +191,6 @@ impl TryFrom<zc::PusTcSecondaryHeader> for PusTcSecondaryHeader {
 }
 
 impl PusTcSecondaryHeader {
-    #[inline]
     pub fn new_simple(service: u8, subservice: u8) -> Self {
         PusTcSecondaryHeader {
             service,
@@ -204,7 +201,6 @@ impl PusTcSecondaryHeader {
         }
     }
 
-    #[inline]
     pub fn new(service: u8, subservice: u8, ack: u8, source_id: u16) -> Self {
         PusTcSecondaryHeader {
             service,
@@ -216,49 +212,89 @@ impl PusTcSecondaryHeader {
     }
 }
 
-/// This class can be used to create PUS C telecommand packet. It is the primary data structure to
+pub mod legacy_tc {
-/// generate the raw byte representation of a PUS telecommand.
+    use crate::ecss::tc::{
+        zc, GenericPusTcSecondaryHeader, IsPusTelecommand, PusTcSecondaryHeader, ACK_ALL,
+        PUC_TC_SECONDARY_HEADER_LEN, PUS_TC_MIN_LEN_WITHOUT_APP_DATA,
+    };
+    use crate::ecss::{
+        ccsds_impl, crc_from_raw_data, crc_procedure, sp_header_impls,
+        verify_crc16_ccitt_false_from_raw_to_pus_error, PusError, PusPacket, WritablePusPacket,
+        CCSDS_HEADER_LEN,
+    };
+    use crate::ecss::{user_data_from_raw, PusVersion};
+    use crate::SequenceFlags;
+    use crate::{ByteConversionError, CcsdsPacket, PacketType, SpHeader, CRC_CCITT_FALSE};
+    use core::mem::size_of;
+    use delegate::delegate;
+    use zerocopy::AsBytes;
+
+    #[cfg(feature = "alloc")]
+    use alloc::vec::Vec;
+
+    #[cfg(feature = "serde")]
+    use serde::{Deserialize, Serialize};
+
+    /// This class models the PUS C telecommand packet. It is the primary data structure to generate the
+    /// raw byte representation of a PUS telecommand or to deserialize from one from raw bytes.
     ///
     /// This class also derives the [serde::Serialize] and [serde::Deserialize] trait if the
     /// [serde] feature is used, which allows to send around TC packets in a raw byte format using a
     /// serde provider like [postcard](https://docs.rs/postcard/latest/postcard/).
     ///
     /// There is no spare bytes support yet.
-#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+    ///
+    /// # Lifetimes
+    ///
+    /// * `'raw_data` - If the TC is not constructed from a raw slice, this will be the life time of
+    ///    a buffer where the user provided application data will be serialized into. If it
+    ///    is, this is the lifetime of the raw byte slice it is constructed from.
+    #[derive(Eq, Copy, Clone, Debug)]
     #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
+    pub struct PusTc<'raw_data> {
-pub struct PusTcCreator<'app_data> {
         sp_header: SpHeader,
         pub sec_header: PusTcSecondaryHeader,
-    app_data: &'app_data [u8],
+        /// If this is set to false, a manual call to [PusTc::calc_own_crc16] or
+        /// [PusTc::update_packet_fields] is necessary for the serialized or cached CRC16 to be valid.
+        pub calc_crc_on_serialization: bool,
+        #[cfg_attr(feature = "serde", serde(skip))]
+        raw_data: Option<&'raw_data [u8]>,
+        app_data: &'raw_data [u8],
+        crc16: Option<u16>,
     }
 
-impl<'app_data> PusTcCreator<'app_data> {
+    impl<'raw_data> PusTc<'raw_data> {
         /// Generates a new struct instance.
         ///
         /// # Arguments
         ///
-    /// * `sp_header` - Space packet header information. The correct packet type and the secondary
+        /// * `sp_header` - Space packet header information. The correct packet type will be set
-    ///     header flag are set correctly by the constructor.
+        ///     automatically
         /// * `sec_header` - Information contained in the data field header, including the service
         ///     and subservice type
         /// * `app_data` - Custom application data
         /// * `set_ccsds_len` - Can be used to automatically update the CCSDS space packet data length
-    ///     field. If this is not set to true, [Self::update_ccsds_data_len] can be called to set
+        ///     field. If this is not set to true, [PusTc::update_ccsds_data_len] can be called to set
         ///     the correct value to this field manually
-    #[inline]
+        #[deprecated(
+            since = "0.7.0",
+            note = "Use specialized PusTcCreator or PusTcReader classes instead"
+        )]
         pub fn new(
-        mut sp_header: SpHeader,
+            sp_header: &mut SpHeader,
             sec_header: PusTcSecondaryHeader,
-        app_data: &'app_data [u8],
+            app_data: Option<&'raw_data [u8]>,
             set_ccsds_len: bool,
         ) -> Self {
             sp_header.set_packet_type(PacketType::Tc);
             sp_header.set_sec_header_flag();
             let mut pus_tc = Self {
-            sp_header,
+                sp_header: *sp_header,
-            app_data,
+                raw_data: None,
+                app_data: app_data.unwrap_or(&[]),
                 sec_header,
+                calc_crc_on_serialization: true,
+                crc16: None,
             };
             if set_ccsds_len {
                 pus_tc.update_ccsds_data_len();
@@ -266,16 +302,20 @@ impl<'app_data> PusTcCreator<'app_data> {
             pus_tc
         }
 
-    /// Simplified version of the [Self::new] function which allows to only specify service
+        /// Simplified version of the [PusTc::new] function which allows to only specify service and
-    /// and subservice instead of the full PUS TC secondary header.
+        /// subservice instead of the full PUS TC secondary header.
-    #[inline]
+        #[deprecated(
+            since = "0.7.0",
+            note = "Use specialized PusTcCreator or PusTcReader classes instead"
+        )]
         pub fn new_simple(
-        sph: SpHeader,
+            sph: &mut SpHeader,
             service: u8,
             subservice: u8,
-        app_data: &'app_data [u8],
+            app_data: Option<&'raw_data [u8]>,
             set_ccsds_len: bool,
         ) -> Self {
+            #[allow(deprecated)]
             Self::new(
                 sph,
                 PusTcSecondaryHeader::new(service, subservice, ACK_ALL, 0),
@@ -284,26 +324,10 @@ impl<'app_data> PusTcCreator<'app_data> {
             )
         }
 
-    #[inline]
-    pub fn new_no_app_data(
-        sp_header: SpHeader,
-        sec_header: PusTcSecondaryHeader,
-        set_ccsds_len: bool,
-    ) -> Self {
-        Self::new(sp_header, sec_header, &[], set_ccsds_len)
-    }
-
-    #[inline]
         pub fn sp_header(&self) -> &SpHeader {
             &self.sp_header
         }
 
-    #[inline]
-    pub fn sp_header_mut(&mut self) -> &mut SpHeader {
-        &mut self.sp_header
-    }
-
-    #[inline]
         pub fn set_ack_field(&mut self, ack: u8) -> bool {
             if ack > 0b1111 {
                 return false;
@@ -312,7 +336,6 @@ impl<'app_data> PusTcCreator<'app_data> {
             true
         }
 
-    #[inline]
         pub fn set_source_id(&mut self, source_id: u16) {
             self.sec_header.source_id = source_id;
         }
@@ -320,48 +343,122 @@ impl<'app_data> PusTcCreator<'app_data> {
         sp_header_impls!();
 
         /// Calculate the CCSDS space packet data length field and sets it
-    /// This is called automatically if the `set_ccsds_len` argument in the [Self::new] call was
+        /// This is called automatically if the `set_ccsds_len` argument in the [PusTc::new] call was
         /// used.
         /// If this was not done or the application data is set or changed after construction,
         /// this function needs to be called to ensure that the data length field of the CCSDS header
         /// is set correctly.
-    #[inline]
         pub fn update_ccsds_data_len(&mut self) {
             self.sp_header.data_len =
                 self.len_written() as u16 - size_of::<crate::zc::SpHeader>() as u16 - 1;
         }
 
-    /// This function calculates and returns the CRC16 for the current packet.
+        /// This function should be called before the TC packet is serialized if
-    pub fn calc_own_crc16(&self) -> u16 {
+        /// [PusTc::calc_crc_on_serialization] is set to False. It will calculate and cache the CRC16.
+        pub fn calc_own_crc16(&mut self) {
             let mut digest = CRC_CCITT_FALSE.digest();
             let sph_zc = crate::zc::SpHeader::from(self.sp_header);
             digest.update(sph_zc.as_bytes());
             let pus_tc_header = zc::PusTcSecondaryHeader::try_from(self.sec_header).unwrap();
             digest.update(pus_tc_header.as_bytes());
+            if !self.app_data.is_empty() {
                 digest.update(self.app_data);
-        digest.finalize()
+            }
+            self.crc16 = Some(digest.finalize())
+        }
+
+        /// This helper function calls both [PusTc::update_ccsds_data_len] and [PusTc::calc_own_crc16].
+        pub fn update_packet_fields(&mut self) {
+            self.update_ccsds_data_len();
+            self.calc_own_crc16();
         }
 
         #[cfg(feature = "alloc")]
-    pub fn append_to_vec(&self, vec: &mut Vec<u8>) -> usize {
+        #[cfg_attr(doc_cfg, doc(cfg(feature = "alloc")))]
+        pub fn append_to_vec(&self, vec: &mut Vec<u8>) -> Result<usize, PusError> {
             let sph_zc = crate::zc::SpHeader::from(self.sp_header);
-        let mut appended_len = PUS_TC_MIN_LEN_WITHOUT_APP_DATA;
+            let appended_len = PUS_TC_MIN_LEN_WITHOUT_APP_DATA + self.app_data.len();
-        appended_len += self.app_data.len();
             let start_idx = vec.len();
+            let mut ser_len = 0;
             vec.extend_from_slice(sph_zc.as_bytes());
+            ser_len += sph_zc.as_bytes().len();
             // The PUS version is hardcoded to PUS C
             let pus_tc_header = zc::PusTcSecondaryHeader::try_from(self.sec_header).unwrap();
             vec.extend_from_slice(pus_tc_header.as_bytes());
+            ser_len += pus_tc_header.as_bytes().len();
             vec.extend_from_slice(self.app_data);
-        let mut digest = CRC_CCITT_FALSE.digest();
+            ser_len += self.app_data.len();
-        digest.update(&vec[start_idx..start_idx + appended_len - 2]);
+            let crc16 = crc_procedure(
-        vec.extend_from_slice(&digest.finalize().to_be_bytes());
+                self.calc_crc_on_serialization,
-        appended_len
+                &self.crc16,
+                start_idx,
+                ser_len,
+                &vec[start_idx..ser_len],
+            )?;
+            vec.extend_from_slice(crc16.to_be_bytes().as_slice());
+            Ok(appended_len)
+        }
+
+        /// Create a [PusTc] instance from a raw slice. On success, it returns a tuple containing
+        /// the instance and the found byte length of the packet.
+        #[deprecated(
+            since = "0.7.0",
+            note = "Use specialized PusTcCreator or PusTcReader classes instead"
+        )]
+        pub fn from_bytes(slice: &'raw_data [u8]) -> Result<(Self, usize), PusError> {
+            let raw_data_len = slice.len();
+            if raw_data_len < PUS_TC_MIN_LEN_WITHOUT_APP_DATA {
+                return Err(ByteConversionError::FromSliceTooSmall {
+                    found: raw_data_len,
+                    expected: PUS_TC_MIN_LEN_WITHOUT_APP_DATA,
+                }
+                .into());
+            }
+            let mut current_idx = 0;
+            let (sp_header, _) = SpHeader::from_be_bytes(&slice[0..CCSDS_HEADER_LEN])?;
+            current_idx += CCSDS_HEADER_LEN;
+            let total_len = sp_header.total_len();
+            if raw_data_len < total_len || total_len < PUS_TC_MIN_LEN_WITHOUT_APP_DATA {
+                return Err(ByteConversionError::FromSliceTooSmall {
+                    found: raw_data_len,
+                    expected: total_len,
+                }
+                .into());
+            }
+            let sec_header = zc::PusTcSecondaryHeader::from_bytes(
+                &slice[current_idx..current_idx + PUC_TC_SECONDARY_HEADER_LEN],
+            )
+            .ok_or(ByteConversionError::ZeroCopyFromError)?;
+            current_idx += PUC_TC_SECONDARY_HEADER_LEN;
+            let raw_data = &slice[0..total_len];
+            let pus_tc = Self {
+                sp_header,
+                sec_header: PusTcSecondaryHeader::try_from(sec_header).unwrap(),
+                raw_data: Some(raw_data),
+                app_data: user_data_from_raw(current_idx, total_len, slice)?,
+                calc_crc_on_serialization: false,
+                crc16: Some(crc_from_raw_data(raw_data)?),
+            };
+            verify_crc16_ccitt_false_from_raw_to_pus_error(
+                raw_data,
+                pus_tc.crc16.expect("CRC16 invalid"),
+            )?;
+            Ok((pus_tc, total_len))
+        }
+
+        #[deprecated(since = "0.5.2", note = "use raw_bytes() instead")]
+        pub fn raw(&self) -> Option<&'raw_data [u8]> {
+            self.raw_bytes()
+        }
+
+        /// If [Self] was constructed [Self::from_bytes], this function will return the slice it was
+        /// constructed from. Otherwise, [None] will be returned.
+        pub fn raw_bytes(&self) -> Option<&'raw_data [u8]> {
+            self.raw_data
         }
     }
 
-impl WritablePusPacket for PusTcCreator<'_> {
+    impl WritablePusPacket for PusTc<'_> {
-    #[inline]
         fn len_written(&self) -> usize {
             PUS_TC_MIN_LEN_WITHOUT_APP_DATA + self.app_data.len()
         }
@@ -382,8 +479,222 @@ impl WritablePusPacket for PusTcCreator<'_> {
             curr_idx += CCSDS_HEADER_LEN;
             let sec_header = zc::PusTcSecondaryHeader::try_from(self.sec_header).unwrap();
             sec_header
-            .write_to(&mut slice[curr_idx..curr_idx + tc_header_len])
+                .write_to_bytes(&mut slice[curr_idx..curr_idx + tc_header_len])
-            .map_err(|_| ByteConversionError::ZeroCopyToError)?;
+                .ok_or(ByteConversionError::ZeroCopyToError)?;
+
+            curr_idx += tc_header_len;
+            slice[curr_idx..curr_idx + self.app_data.len()].copy_from_slice(self.app_data);
+            curr_idx += self.app_data.len();
+            let crc16 = crc_procedure(
+                self.calc_crc_on_serialization,
+                &self.crc16,
+                0,
+                curr_idx,
+                slice,
+            )?;
+            slice[curr_idx..curr_idx + 2].copy_from_slice(crc16.to_be_bytes().as_slice());
+            curr_idx += 2;
+            Ok(curr_idx)
+        }
+    }
+
+    impl PartialEq for PusTc<'_> {
+        fn eq(&self, other: &Self) -> bool {
+            self.sp_header == other.sp_header
+                && self.sec_header == other.sec_header
+                && self.app_data == other.app_data
+        }
+    }
+
+    impl CcsdsPacket for PusTc<'_> {
+        ccsds_impl!();
+    }
+
+    impl PusPacket for PusTc<'_> {
+        delegate!(to self.sec_header {
+            fn pus_version(&self) -> PusVersion;
+            fn service(&self) -> u8;
+            fn subservice(&self) -> u8;
+        });
+
+        fn user_data(&self) -> &[u8] {
+            self.app_data
+        }
+
+        fn crc16(&self) -> Option<u16> {
+            self.crc16
+        }
+    }
+
+    impl GenericPusTcSecondaryHeader for PusTc<'_> {
+        delegate!(to self.sec_header {
+            fn pus_version(&self) -> PusVersion;
+            fn service(&self) -> u8;
+            fn subservice(&self) -> u8;
+            fn source_id(&self) -> u16;
+            fn ack_flags(&self) -> u8;
+        });
+    }
+
+    impl IsPusTelecommand for PusTc<'_> {}
+}
+
+/// This class can be used to create PUS C telecommand packet. It is the primary data structure to
+/// generate the raw byte representation of a PUS telecommand.
+///
+/// This class also derives the [serde::Serialize] and [serde::Deserialize] trait if the
+/// [serde] feature is used, which allows to send around TC packets in a raw byte format using a
+/// serde provider like [postcard](https://docs.rs/postcard/latest/postcard/).
+///
+/// There is no spare bytes support yet.
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
+pub struct PusTcCreator<'raw_data> {
+    sp_header: SpHeader,
+    pub sec_header: PusTcSecondaryHeader,
+    app_data: &'raw_data [u8],
+}
+
+impl<'raw_data> PusTcCreator<'raw_data> {
+    /// Generates a new struct instance.
+    ///
+    /// # Arguments
+    ///
+    /// * `sp_header` - Space packet header information. The correct packet type will be set
+    ///     automatically
+    /// * `sec_header` - Information contained in the data field header, including the service
+    ///     and subservice type
+    /// * `app_data` - Custom application data
+    /// * `set_ccsds_len` - Can be used to automatically update the CCSDS space packet data length
+    ///     field. If this is not set to true, [PusTc::update_ccsds_data_len] can be called to set
+    ///     the correct value to this field manually
+    pub fn new(
+        sp_header: &mut SpHeader,
+        sec_header: PusTcSecondaryHeader,
+        app_data: &'raw_data [u8],
+        set_ccsds_len: bool,
+    ) -> Self {
+        sp_header.set_packet_type(PacketType::Tc);
+        sp_header.set_sec_header_flag();
+        let mut pus_tc = Self {
+            sp_header: *sp_header,
+            app_data,
+            sec_header,
+        };
+        if set_ccsds_len {
+            pus_tc.update_ccsds_data_len();
+        }
+        pus_tc
+    }
+
+    /// Simplified version of the [PusTcCreator::new] function which allows to only specify service
+    /// and subservice instead of the full PUS TC secondary header.
+    pub fn new_simple(
+        sph: &mut SpHeader,
+        service: u8,
+        subservice: u8,
+        app_data: Option<&'raw_data [u8]>,
+        set_ccsds_len: bool,
+    ) -> Self {
+        Self::new(
+            sph,
+            PusTcSecondaryHeader::new(service, subservice, ACK_ALL, 0),
+            app_data.unwrap_or(&[]),
+            set_ccsds_len,
+        )
+    }
+
+    pub fn new_no_app_data(
+        sp_header: &mut SpHeader,
+        sec_header: PusTcSecondaryHeader,
+        set_ccsds_len: bool,
+    ) -> Self {
+        Self::new(sp_header, sec_header, &[], set_ccsds_len)
+    }
+
+    pub fn sp_header(&self) -> &SpHeader {
+        &self.sp_header
+    }
+
+    pub fn set_ack_field(&mut self, ack: u8) -> bool {
+        if ack > 0b1111 {
+            return false;
+        }
+        self.sec_header.ack = ack & 0b1111;
+        true
+    }
+
+    pub fn set_source_id(&mut self, source_id: u16) {
+        self.sec_header.source_id = source_id;
+    }
+
+    sp_header_impls!();
+
+    /// Calculate the CCSDS space packet data length field and sets it
+    /// This is called automatically if the `set_ccsds_len` argument in the [PusTc::new] call was
+    /// used.
+    /// If this was not done or the application data is set or changed after construction,
+    /// this function needs to be called to ensure that the data length field of the CCSDS header
+    /// is set correctly.
+    pub fn update_ccsds_data_len(&mut self) {
+        self.sp_header.data_len =
+            self.len_written() as u16 - size_of::<crate::zc::SpHeader>() as u16 - 1;
+    }
+
+    /// This function should be called before the TC packet is serialized if
+    /// [PusTc::calc_crc_on_serialization] is set to False. It will calculate and cache the CRC16.
+    pub fn calc_own_crc16(&self) -> u16 {
+        let mut digest = CRC_CCITT_FALSE.digest();
+        let sph_zc = crate::zc::SpHeader::from(self.sp_header);
+        digest.update(sph_zc.as_bytes());
+        let pus_tc_header = zc::PusTcSecondaryHeader::try_from(self.sec_header).unwrap();
+        digest.update(pus_tc_header.as_bytes());
+        digest.update(self.app_data);
+        digest.finalize()
+    }
+
+    #[cfg(feature = "alloc")]
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "alloc")))]
+    pub fn append_to_vec(&self, vec: &mut Vec<u8>) -> Result<usize, PusError> {
+        let sph_zc = crate::zc::SpHeader::from(self.sp_header);
+        let mut appended_len = PUS_TC_MIN_LEN_WITHOUT_APP_DATA;
+        appended_len += self.app_data.len();
+        let start_idx = vec.len();
+        vec.extend_from_slice(sph_zc.as_bytes());
+        // The PUS version is hardcoded to PUS C
+        let pus_tc_header = zc::PusTcSecondaryHeader::try_from(self.sec_header).unwrap();
+        vec.extend_from_slice(pus_tc_header.as_bytes());
+        vec.extend_from_slice(self.app_data);
+        let mut digest = CRC_CCITT_FALSE.digest();
+        digest.update(&vec[start_idx..start_idx + appended_len - 2]);
+        vec.extend_from_slice(&digest.finalize().to_be_bytes());
+        Ok(appended_len)
+    }
+}
+
+impl WritablePusPacket for PusTcCreator<'_> {
+    fn len_written(&self) -> usize {
+        PUS_TC_MIN_LEN_WITHOUT_APP_DATA + self.app_data.len()
+    }
+
+    /// Write the raw PUS byte representation to a provided buffer.
+    fn write_to_bytes(&self, slice: &mut [u8]) -> Result<usize, PusError> {
+        let mut curr_idx = 0;
+        let tc_header_len = size_of::<zc::PusTcSecondaryHeader>();
+        let total_size = self.len_written();
+        if total_size > slice.len() {
+            return Err(ByteConversionError::ToSliceTooSmall {
+                found: slice.len(),
+                expected: total_size,
+            }
+            .into());
+        }
+        self.sp_header.write_to_be_bytes(slice)?;
+        curr_idx += CCSDS_HEADER_LEN;
+        let sec_header = zc::PusTcSecondaryHeader::try_from(self.sec_header).unwrap();
+        sec_header
+            .write_to_bytes(&mut slice[curr_idx..curr_idx + tc_header_len])
+            .ok_or(ByteConversionError::ZeroCopyToError)?;
 
         curr_idx += tc_header_len;
         slice[curr_idx..curr_idx + self.app_data.len()].copy_from_slice(self.app_data);
@@ -402,20 +713,15 @@ impl CcsdsPacket for PusTcCreator<'_> {
 
 impl PusPacket for PusTcCreator<'_> {
     delegate!(to self.sec_header {
-        #[inline]
         fn pus_version(&self) -> PusVersion;
-        #[inline]
         fn service(&self) -> u8;
-        #[inline]
         fn subservice(&self) -> u8;
     });
 
-    #[inline]
     fn user_data(&self) -> &[u8] {
         self.app_data
     }
 
-    #[inline]
     fn crc16(&self) -> Option<u16> {
         Some(self.calc_own_crc16())
     }
@@ -423,15 +729,10 @@ impl PusPacket for PusTcCreator<'_> {
 
 impl GenericPusTcSecondaryHeader for PusTcCreator<'_> {
     delegate!(to self.sec_header {
-        #[inline]
         fn pus_version(&self) -> PusVersion;
-        #[inline]
         fn service(&self) -> u8;
-        #[inline]
         fn subservice(&self) -> u8;
-        #[inline]
         fn source_id(&self) -> u16;
-        #[inline]
         fn ack_flags(&self) -> u8;
     });
 }
@@ -451,7 +752,6 @@ impl IsPusTelecommand for PusTcCreator<'_> {}
 /// * `'raw_data` - Lifetime of the provided raw slice.
 #[derive(Eq, Copy, Clone, Debug)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct PusTcReader<'raw_data> {
     #[cfg_attr(feature = "serde", serde(skip))]
     raw_data: &'raw_data [u8],
@@ -463,8 +763,7 @@ pub struct PusTcReader<'raw_data> {
 
 impl<'raw_data> PusTcReader<'raw_data> {
     /// Create a [PusTcReader] instance from a raw slice. On success, it returns a tuple containing
-    /// the instance and the found byte length of the packet. This function also performs a CRC
+    /// the instance and the found byte length of the packet.
-    /// check and will return an appropriate [PusError] if the check fails.
     pub fn new(slice: &'raw_data [u8]) -> Result<(Self, usize), PusError> {
         let raw_data_len = slice.len();
         if raw_data_len < PUS_TC_MIN_LEN_WITHOUT_APP_DATA {
@@ -492,10 +791,10 @@ impl<'raw_data> PusTcReader<'raw_data> {
             }
             .into());
         }
-        let sec_header = zc::PusTcSecondaryHeader::read_from_bytes(
+        let sec_header = zc::PusTcSecondaryHeader::from_bytes(
             &slice[current_idx..current_idx + PUC_TC_SECONDARY_HEADER_LEN],
         )
-        .map_err(|_| ByteConversionError::ZeroCopyFromError)?;
+        .ok_or(ByteConversionError::ZeroCopyFromError)?;
         current_idx += PUC_TC_SECONDARY_HEADER_LEN;
         let raw_data = &slice[0..total_len];
         let pus_tc = Self {
@@ -509,29 +808,24 @@ impl<'raw_data> PusTcReader<'raw_data> {
         Ok((pus_tc, total_len))
     }
 
-    #[inline]
     pub fn app_data(&self) -> &[u8] {
         self.user_data()
     }
 
-    #[inline]
     pub fn raw_data(&self) -> &[u8] {
         self.raw_data
     }
 
-    #[inline]
     pub fn len_packed(&self) -> usize {
         self.sp_header.total_len()
     }
 
-    #[inline]
     pub fn sp_header(&self) -> &SpHeader {
         &self.sp_header
     }
 }
 
 impl PartialEq for PusTcReader<'_> {
-    #[inline]
     fn eq(&self, other: &Self) -> bool {
         self.raw_data == other.raw_data
     }
@@ -543,20 +837,15 @@ impl CcsdsPacket for PusTcReader<'_> {
 
 impl PusPacket for PusTcReader<'_> {
     delegate!(to self.sec_header {
-        #[inline]
         fn pus_version(&self) -> PusVersion;
-        #[inline]
         fn service(&self) -> u8;
-        #[inline]
         fn subservice(&self) -> u8;
     });
 
-    #[inline]
     fn user_data(&self) -> &[u8] {
         self.app_data
     }
 
-    #[inline]
     fn crc16(&self) -> Option<u16> {
         Some(self.crc16)
     }
@@ -564,15 +853,10 @@ impl PusPacket for PusTcReader<'_> {
 
 impl GenericPusTcSecondaryHeader for PusTcReader<'_> {
     delegate!(to self.sec_header {
-        #[inline]
         fn pus_version(&self) -> PusVersion;
-        #[inline]
         fn service(&self) -> u8;
-        #[inline]
         fn subservice(&self) -> u8;
-        #[inline]
         fn source_id(&self) -> u16;
-        #[inline]
         fn ack_flags(&self) -> u8;
     });
 }
@@ -610,19 +894,19 @@ mod tests {
     use postcard::{from_bytes, to_allocvec};
 
     fn base_ping_tc_full_ctor() -> PusTcCreator<'static> {
-        let sph = SpHeader::new_for_unseg_tc_checked(0x02, 0x34, 0).unwrap();
+        let mut sph = SpHeader::tc_unseg(0x02, 0x34, 0).unwrap();
         let tc_header = PusTcSecondaryHeader::new_simple(17, 1);
-        PusTcCreator::new_no_app_data(sph, tc_header, true)
+        PusTcCreator::new_no_app_data(&mut sph, tc_header, true)
     }
 
     fn base_ping_tc_simple_ctor() -> PusTcCreator<'static> {
-        let sph = SpHeader::new_for_unseg_tc_checked(0x02, 0x34, 0).unwrap();
+        let mut sph = SpHeader::tc_unseg(0x02, 0x34, 0).unwrap();
-        PusTcCreator::new_simple(sph, 17, 1, &[], true)
+        PusTcCreator::new_simple(&mut sph, 17, 1, None, true)
     }
 
     fn base_ping_tc_simple_ctor_with_app_data(app_data: &'static [u8]) -> PusTcCreator<'static> {
-        let sph = SpHeader::new_for_unseg_tc_checked(0x02, 0x34, 0).unwrap();
+        let mut sph = SpHeader::tc_unseg(0x02, 0x34, 0).unwrap();
-        PusTcCreator::new_simple(sph, 17, 1, app_data, true)
+        PusTcCreator::new_simple(&mut sph, 17, 1, Some(app_data), true)
     }
 
     #[test]
@@ -678,8 +962,8 @@ mod tests {
 
     #[test]
     fn test_update_func() {
-        let sph = SpHeader::new_for_unseg_tc_checked(0x02, 0x34, 0).unwrap();
+        let mut sph = SpHeader::tc_unseg(0x02, 0x34, 0).unwrap();
-        let mut tc = PusTcCreator::new_simple(sph, 17, 1, &[], false);
+        let mut tc = PusTcCreator::new_simple(&mut sph, 17, 1, None, false);
         assert_eq!(tc.data_len(), 0);
         tc.update_ccsds_data_len();
         assert_eq!(tc.data_len(), 6);
@@ -726,7 +1010,9 @@ mod tests {
     fn test_vec_ser_deser() {
         let pus_tc = base_ping_tc_simple_ctor();
         let mut test_vec = Vec::new();
-        let size = pus_tc.append_to_vec(&mut test_vec);
+        let size = pus_tc
+            .append_to_vec(&mut test_vec)
+            .expect("Error writing TC to vector");
         assert_eq!(size, 13);
         verify_test_tc_raw(&test_vec.as_slice());
         verify_crc_no_app_data(&test_vec.as_slice());
@@ -772,7 +1058,9 @@ mod tests {
         let pus_tc = base_ping_tc_simple_ctor_with_app_data(&[1, 2, 3]);
         verify_test_tc(&pus_tc, true, 16);
         let mut test_vec = Vec::new();
-        let size = pus_tc.append_to_vec(&mut test_vec);
+        let size = pus_tc
+            .append_to_vec(&mut test_vec)
+            .expect("Error writing TC to vector");
         assert_eq!(test_vec[11], 1);
         assert_eq!(test_vec[12], 2);
         assert_eq!(test_vec[13], 3);
@@ -851,8 +1139,7 @@ mod tests {
         if !has_user_data {
             assert!(tc.user_data().is_empty());
         }
-        let mut comp_header =
+        let mut comp_header = SpHeader::tc_unseg(0x02, 0x34, exp_full_len as u16 - 7).unwrap();
-            SpHeader::new_for_unseg_tc_checked(0x02, 0x34, exp_full_len as u16 - 7).unwrap();
         comp_header.set_sec_header_flag();
         assert_eq!(*tc.sp_header(), comp_header);
     }
@@ -863,8 +1150,7 @@ mod tests {
             assert!(tc.user_data().is_empty());
         }
         assert_eq!(tc.len_packed(), exp_full_len);
-        let mut comp_header =
+        let mut comp_header = SpHeader::tc_unseg(0x02, 0x34, exp_full_len as u16 - 7).unwrap();
-            SpHeader::new_for_unseg_tc_checked(0x02, 0x34, exp_full_len as u16 - 7).unwrap();
         comp_header.set_sec_header_flag();
         assert_eq!(*tc.sp_header(), comp_header);
     }

src/lib.rs

@@ -22,6 +22,10 @@
 //!
 //! `spacepackets` supports various runtime environments and is also suitable for `no_std` environments.
 //!
+//! It also offers optional support for [`serde`](https://serde.rs/). This allows serializing and
+//! deserializing them with an appropriate `serde` provider like
+//! [`postcard`](https://github.com/jamesmunns/postcard).
+//!
 //! ### Default features
 //!
 //!  - [`std`](https://doc.rust-lang.org/std/): Enables functionality relying on the standard library.
@@ -32,11 +36,7 @@
 //! ### Optional features
 //!
 //!  - [`serde`](https://serde.rs/): Adds `serde` support for most types by adding `Serialize` and
-//!    `Deserialize` `derives.
+//!    `Deserialize` `derive`s
-//!  - [`chrono`](https://crates.io/crates/chrono): Add basic support for the `chrono` time library.
-//!  - [`timelib`](https://crates.io/crates/time): Add basic support for the `time` time library.
-//!  - [`defmt`](https://defmt.ferrous-systems.com/): Add support for the `defmt` by adding the
-//!    [`defmt::Format`](https://defmt.ferrous-systems.com/format) derive on many types.
 //!
 //! ## Module
 //!
@@ -48,30 +48,35 @@
 //!
 //! ```rust
 //! use spacepackets::SpHeader;
-//! let sp_header = SpHeader::new_for_unseg_tc_checked(0x42, 12, 1).expect("error creating CCSDS TC header");
+//! let sp_header = SpHeader::tc_unseg(0x42, 12, 1).expect("Error creating CCSDS TC header");
 //! println!("{:?}", sp_header);
 //! let mut ccsds_buf: [u8; 32] = [0; 32];
 //! sp_header.write_to_be_bytes(&mut ccsds_buf).expect("Writing CCSDS TC header failed");
 //! println!("{:x?}", &ccsds_buf[0..6]);
 //! ```
 #![no_std]
-#![cfg_attr(docsrs, feature(doc_auto_cfg))]
+#![cfg_attr(doc_cfg, feature(doc_cfg))]
 #[cfg(feature = "alloc")]
 extern crate alloc;
 #[cfg(any(feature = "std", test))]
 extern crate std;
 
-use core::{fmt::Debug, hash::Hash};
+use crate::ecss::CCSDS_HEADER_LEN;
+use core::{
+    fmt::{Debug, Display, Formatter},
+    hash::Hash,
+};
 use crc::{Crc, CRC_16_IBM_3740};
 use delegate::delegate;
-use zerocopy::{FromBytes, IntoBytes};
+
+#[cfg(feature = "std")]
+use std::error::Error;
 
 #[cfg(feature = "serde")]
 use serde::{Deserialize, Serialize};
 
 pub mod cfdp;
 pub mod ecss;
-pub mod seq_count;
 pub mod time;
 pub mod util;
 
@@ -79,8 +84,6 @@ mod private {
     pub trait Sealed {}
 }
 
-pub const CCSDS_HEADER_LEN: usize = core::mem::size_of::<crate::zc::SpHeader>();
-
 /// CRC algorithm used by the PUS standard, the CCSDS TC standard and the CFDP standard.
 pub const CRC_CCITT_FALSE: Crc<u16> = Crc::<u16>::new(&CRC_16_IBM_3740);
 
@@ -88,28 +91,57 @@ pub const MAX_APID: u16 = 2u16.pow(11) - 1;
 pub const MAX_SEQ_COUNT: u16 = 2u16.pow(14) - 1;
 
 /// Generic error type when converting to and from raw byte slices.
-#[derive(Debug, Copy, Clone, PartialEq, Eq, thiserror::Error)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum ByteConversionError {
     /// The passed slice is too small. Returns the passed slice length and expected minimum size
-    #[error("target slice with size {found} is too small, expected size of at least {expected}")]
+    ToSliceTooSmall {
-    ToSliceTooSmall { found: usize, expected: usize },
+        found: usize,
+        expected: usize,
+    },
     /// The provider buffer is too small. Returns the passed slice length and expected minimum size
-    #[error("source slice with size {found} too small, expected at least {expected} bytes")]
+    FromSliceTooSmall {
-    FromSliceTooSmall { found: usize, expected: usize },
+        found: usize,
+        expected: usize,
+    },
     /// The [zerocopy] library failed to write to bytes
-    #[error("zerocopy serialization error")]
     ZeroCopyToError,
-    /// The [zerocopy] library failed to read from bytes
-    #[error("zerocopy deserialization error")]
     ZeroCopyFromError,
 }
 
+impl Display for ByteConversionError {
+    fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
+        match self {
+            ByteConversionError::ToSliceTooSmall { found, expected } => {
+                write!(
+                    f,
+                    "target slice with size {} is too small, expected size of at least {}",
+                    found, expected
+                )
+            }
+            ByteConversionError::FromSliceTooSmall { found, expected } => {
+                write!(
+                    f,
+                    "source slice with size {} too small, expected at least {} bytes",
+                    found, expected
+                )
+            }
+            ByteConversionError::ZeroCopyToError => {
+                write!(f, "zerocopy serialization error")
+            }
+            ByteConversionError::ZeroCopyFromError => {
+                write!(f, "zerocopy deserialization error")
+            }
+        }
+    }
+}
+
+#[cfg(feature = "std")]
+impl Error for ByteConversionError {}
+
 /// CCSDS packet type enumeration.
 #[derive(Debug, PartialEq, Eq, Copy, Clone)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum PacketType {
     Tm = 0,
     Tc = 1,
@@ -133,7 +165,6 @@ pub fn packet_type_in_raw_packet_id(packet_id: u16) -> PacketType {
 
 #[derive(Debug, PartialEq, Eq, Copy, Clone)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum SequenceFlags {
     ContinuationSegment = 0b00,
     FirstSegment = 0b01,
@@ -161,7 +192,6 @@ impl TryFrom<u8> for SequenceFlags {
 /// of the first two bytes in the CCSDS primary header.
 #[derive(Debug, Eq, Copy, Clone)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct PacketId {
     pub ptype: PacketType,
     pub sec_header_flag: bool,
@@ -169,21 +199,18 @@ pub struct PacketId {
 }
 
 impl PartialEq for PacketId {
-    #[inline]
     fn eq(&self, other: &Self) -> bool {
         self.raw().eq(&other.raw())
     }
 }
 
 impl PartialOrd for PacketId {
-    #[inline]
     fn partial_cmp(&self, other: &Self) -> Option<core::cmp::Ordering> {
         Some(self.cmp(other))
     }
 }
 
 impl Ord for PacketId {
-    #[inline]
     fn cmp(&self, other: &Self) -> core::cmp::Ordering {
         self.raw().cmp(&other.raw())
     }
@@ -197,7 +224,6 @@ impl Hash for PacketId {
 }
 
 impl Default for PacketId {
-    #[inline]
     fn default() -> Self {
         PacketId {
             ptype: PacketType::Tm,
@@ -208,34 +234,23 @@ impl Default for PacketId {
 }
 
 impl PacketId {
-    /// This constructor will panic if the passed APID exceeds [MAX_APID].
+    pub const fn const_tc(sec_header: bool, apid: u16) -> Self {
-    /// Use the checked constructor variants to avoid panics.
+        Self::const_new(PacketType::Tc, sec_header, apid)
-    #[inline]
+    }
-    pub const fn new_for_tc(sec_header: bool, apid: u16) -> Self {
+
+    pub const fn const_tm(sec_header: bool, apid: u16) -> Self {
+        Self::const_new(PacketType::Tm, sec_header, apid)
+    }
+
+    pub fn tc(sec_header: bool, apid: u16) -> Option<Self> {
         Self::new(PacketType::Tc, sec_header, apid)
     }
 
-    /// This constructor will panic if the passed APID exceeds [MAX_APID].
+    pub fn tm(sec_header: bool, apid: u16) -> Option<Self> {
-    /// Use the checked constructor variants to avoid panics.
-    #[inline]
-    pub const fn new_for_tm(sec_header: bool, apid: u16) -> Self {
         Self::new(PacketType::Tm, sec_header, apid)
     }
 
-    #[inline]
+    pub const fn const_new(ptype: PacketType, sec_header: bool, apid: u16) -> Self {
-    pub fn new_for_tc_checked(sec_header: bool, apid: u16) -> Option<Self> {
-        Self::new_checked(PacketType::Tc, sec_header, apid)
-    }
-
-    #[inline]
-    pub fn new_for_tm_checked(sec_header: bool, apid: u16) -> Option<Self> {
-        Self::new_checked(PacketType::Tm, sec_header, apid)
-    }
-
-    /// This constructor will panic if the passed APID exceeds [MAX_APID].
-    /// Use the checked variants to avoid panics.
-    #[inline]
-    pub const fn new(ptype: PacketType, sec_header: bool, apid: u16) -> Self {
         if apid > MAX_APID {
             panic!("APID too large");
         }
@@ -246,18 +261,16 @@ impl PacketId {
         }
     }
 
-    #[inline]
+    pub fn new(ptype: PacketType, sec_header_flag: bool, apid: u16) -> Option<PacketId> {
-    pub fn new_checked(ptype: PacketType, sec_header_flag: bool, apid: u16) -> Option<PacketId> {
         if apid > MAX_APID {
             return None;
         }
-        Some(PacketId::new(ptype, sec_header_flag, apid))
+        Some(PacketId::const_new(ptype, sec_header_flag, apid))
     }
 
     /// Set a new Application Process ID (APID). If the passed number is invalid, the APID will
     /// not be set and false will be returned. The maximum allowed value for the 11-bit field is
     /// 2047
-    #[inline]
     pub fn set_apid(&mut self, apid: u16) -> bool {
         if apid > MAX_APID {
             return false;
@@ -266,7 +279,6 @@ impl PacketId {
         true
     }
 
-    #[inline]
     pub fn apid(&self) -> u16 {
         self.apid
     }
@@ -291,17 +303,15 @@ impl From<u16> for PacketId {
 /// third and the fourth byte in the CCSDS primary header.
 #[derive(Debug, PartialEq, Eq, Copy, Clone)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct PacketSequenceCtrl {
     pub seq_flags: SequenceFlags,
     seq_count: u16,
 }
 
 impl PacketSequenceCtrl {
-    /// This constructor panics if the sequence count exceeds [MAX_SEQ_COUNT].
+    /// const variant of [PacketSequenceCtrl::new], but panics if the sequence count exceeds
-    /// Use [Self::new_checked] to avoid panics.
+    /// [MAX_SEQ_COUNT].
-    #[inline]
+    pub const fn const_new(seq_flags: SequenceFlags, seq_count: u16) -> PacketSequenceCtrl {
-    pub const fn new(seq_flags: SequenceFlags, seq_count: u16) -> PacketSequenceCtrl {
         if seq_count > MAX_SEQ_COUNT {
             panic!("Sequence count too large");
         }
@@ -312,22 +322,18 @@ impl PacketSequenceCtrl {
     }
 
     /// Returns [None] if the passed sequence count exceeds [MAX_SEQ_COUNT].
-    #[inline]
+    pub fn new(seq_flags: SequenceFlags, seq_count: u16) -> Option<PacketSequenceCtrl> {
-    pub fn new_checked(seq_flags: SequenceFlags, seq_count: u16) -> Option<PacketSequenceCtrl> {
         if seq_count > MAX_SEQ_COUNT {
             return None;
         }
-        Some(PacketSequenceCtrl::new(seq_flags, seq_count))
+        Some(PacketSequenceCtrl::const_new(seq_flags, seq_count))
     }
-
-    #[inline]
     pub fn raw(&self) -> u16 {
         ((self.seq_flags as u16) << 14) | self.seq_count
     }
 
     /// Set a new sequence count. If the passed number is invalid, the sequence count will not be
     /// set and false will be returned. The maximum allowed value for the 14-bit field is 16383.
-    #[inline]
     pub fn set_seq_count(&mut self, ssc: u16) -> bool {
         if ssc > MAX_SEQ_COUNT {
             return false;
@@ -336,7 +342,6 @@ impl PacketSequenceCtrl {
         true
     }
 
-    #[inline]
     pub fn seq_count(&self) -> u16 {
         self.seq_count
     }
@@ -378,7 +383,6 @@ pub trait CcsdsPacket {
     /// Retrieve data length field
     fn data_len(&self) -> u16;
     /// Retrieve the total packet size based on the data length field
-    #[inline]
     fn total_len(&self) -> usize {
         usize::from(self.data_len()) + CCSDS_HEADER_LEN + 1
     }
@@ -459,7 +463,6 @@ pub trait CcsdsPrimaryHeader {
 /// * `data_len` - Data length field occupies the fifth and the sixth byte of the raw header
 #[derive(Debug, PartialEq, Eq, Copy, Clone)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct SpHeader {
     pub version: u8,
     pub packet_id: PacketId,
@@ -467,12 +470,9 @@ pub struct SpHeader {
     pub data_len: u16,
 }
 
-pub type SpacePacketHeader = SpHeader;
-
 impl Default for SpHeader {
-    /// The default function sets the sequence flag field to [SequenceFlags::Unsegmented] and the
+    /// The default function sets the sequence flag field to [SequenceFlags::Unsegmented]. The data
-    /// data length to 0.
+    /// length field is set to 1, which denotes an empty space packets.
-    #[inline]
     fn default() -> Self {
         SpHeader {
             version: 0,
@@ -481,13 +481,12 @@ impl Default for SpHeader {
                 seq_flags: SequenceFlags::Unsegmented,
                 seq_count: 0,
             },
-            data_len: 0,
+            data_len: 1,
         }
     }
 }
 
 impl SpHeader {
-    #[inline]
     pub const fn new(packet_id: PacketId, psc: PacketSequenceCtrl, data_len: u16) -> Self {
         Self {
             version: 0,
@@ -497,43 +496,9 @@ impl SpHeader {
         }
     }
 
-    /// This constructor sets the sequence flag field to [SequenceFlags::Unsegmented] and the data
+    /// const variant of the [SpHeader::new_fron_single_fields] function. Panics if the passed
-    /// length to 0.
+    /// APID exceeds [MAX_APID] or the passed packet sequence count exceeds [MAX_SEQ_COUNT].
-    ///
+    const fn const_new_from_single_fields(
-    /// This constructor will panic if the APID exceeds [MAX_APID].
-    #[inline]
-    pub const fn new_from_apid(apid: u16) -> Self {
-        SpHeader {
-            version: 0,
-            packet_id: PacketId::new(PacketType::Tm, false, apid),
-            psc: PacketSequenceCtrl {
-                seq_flags: SequenceFlags::Unsegmented,
-                seq_count: 0,
-            },
-            data_len: 0,
-        }
-    }
-
-    /// Checked variant of [Self::new_from_apid].
-    #[inline]
-    pub fn new_from_apid_checked(apid: u16) -> Option<Self> {
-        Some(SpHeader {
-            version: 0,
-            packet_id: PacketId::new_checked(PacketType::Tm, false, apid)?,
-            psc: PacketSequenceCtrl {
-                seq_flags: SequenceFlags::Unsegmented,
-                seq_count: 0,
-            },
-            data_len: 0,
-        })
-    }
-
-    /// This constructor panics if the passed APID exceeds [MAX_APID] or the passed packet sequence
-    /// count exceeds [MAX_SEQ_COUNT].
-    ///
-    /// The checked constructor variants can be used to avoid panics.
-    #[inline]
-    pub const fn new_from_fields(
         ptype: PacketType,
         sec_header: bool,
         apid: u16,
@@ -548,20 +513,17 @@ impl SpHeader {
             panic!("APID is too large");
         }
         Self {
-            psc: PacketSequenceCtrl::new(seq_flags, seq_count),
+            psc: PacketSequenceCtrl::const_new(seq_flags, seq_count),
-            packet_id: PacketId::new(ptype, sec_header, apid),
+            packet_id: PacketId::const_new(ptype, sec_header, apid),
             data_len,
             version: 0,
         }
     }
 
     /// Create a new Space Packet Header instance which can be used to create generic
-    /// Space Packets.
+    /// Space Packets. This will return [None] if the APID or sequence count argument
-    ///
-    /// This will return [None] if the APID or sequence count argument
     /// exceed [MAX_APID] or [MAX_SEQ_COUNT] respectively. The version field is set to 0b000.
-    #[inline]
+    pub fn new_from_single_fields(
-    pub fn new_from_fields_checked(
         ptype: PacketType,
         sec_header: bool,
         apid: u16,
@@ -572,117 +534,56 @@ impl SpHeader {
         if seq_count > MAX_SEQ_COUNT || apid > MAX_APID {
             return None;
         }
-        Some(SpHeader::new_from_fields(
+        Some(SpHeader::const_new_from_single_fields(
             ptype, sec_header, apid, seq_flags, seq_count, data_len,
         ))
     }
 
     /// Helper function for telemetry space packet headers. The packet type field will be
     /// set accordingly. The secondary header flag field is set to false.
-    #[inline]
+    pub fn tm(apid: u16, seq_flags: SequenceFlags, seq_count: u16, data_len: u16) -> Option<Self> {
-    pub fn new_for_tm_checked(
+        Self::new_from_single_fields(PacketType::Tm, false, apid, seq_flags, seq_count, data_len)
-        apid: u16,
-        seq_flags: SequenceFlags,
-        seq_count: u16,
-        data_len: u16,
-    ) -> Option<Self> {
-        Self::new_from_fields_checked(PacketType::Tm, false, apid, seq_flags, seq_count, data_len)
     }
 
     /// Helper function for telemetry space packet headers. The packet type field will be
     /// set accordingly. The secondary header flag field is set to false.
-    #[inline]
+    pub fn tc(apid: u16, seq_flags: SequenceFlags, seq_count: u16, data_len: u16) -> Option<Self> {
-    pub fn new_for_tc_checked(
+        Self::new_from_single_fields(PacketType::Tc, false, apid, seq_flags, seq_count, data_len)
-        apid: u16,
-        seq_flags: SequenceFlags,
-        seq_count: u16,
-        data_len: u16,
-    ) -> Option<Self> {
-        Self::new_from_fields_checked(PacketType::Tc, false, apid, seq_flags, seq_count, data_len)
     }
 
-    /// This is an unchecked constructor which can panic on invalid input.
+    /// Variant of [SpHeader::tm] which sets the sequence flag field to [SequenceFlags::Unsegmented]
-    #[inline]
+    pub fn tm_unseg(apid: u16, seq_count: u16, data_len: u16) -> Option<Self> {
-    pub const fn new_for_tm(
+        Self::tm(apid, SequenceFlags::Unsegmented, seq_count, data_len)
-        apid: u16,
-        seq_flags: SequenceFlags,
-        seq_count: u16,
-        data_len: u16,
-    ) -> Self {
-        Self::new_from_fields(PacketType::Tm, false, apid, seq_flags, seq_count, data_len)
     }
 
-    /// This is an unchecked constructor which can panic on invalid input.
+    /// Variant of [SpHeader::tc] which sets the sequence flag field to [SequenceFlags::Unsegmented]
-    #[inline]
+    pub fn tc_unseg(apid: u16, seq_count: u16, data_len: u16) -> Option<Self> {
-    pub const fn new_for_tc(
+        Self::tc(apid, SequenceFlags::Unsegmented, seq_count, data_len)
-        apid: u16,
-        seq_flags: SequenceFlags,
-        seq_count: u16,
-        data_len: u16,
-    ) -> Self {
-        Self::new_from_fields(PacketType::Tc, false, apid, seq_flags, seq_count, data_len)
     }
 
-    /// Variant of [SpHeader::new_for_tm_checked] which sets the sequence flag field to [SequenceFlags::Unsegmented]
+    //noinspection RsTraitImplementation
-    #[inline]
+    delegate!(to self.packet_id {
-    pub fn new_for_unseg_tm_checked(apid: u16, seq_count: u16, data_len: u16) -> Option<Self> {
-        Self::new_for_tm_checked(apid, SequenceFlags::Unsegmented, seq_count, data_len)
-    }
-
-    /// Variant of [SpHeader::new_for_tc_checked] which sets the sequence flag field to [SequenceFlags::Unsegmented]
-    #[inline]
-    pub fn new_for_unseg_tc_checked(apid: u16, seq_count: u16, data_len: u16) -> Option<Self> {
-        Self::new_for_tc_checked(apid, SequenceFlags::Unsegmented, seq_count, data_len)
-    }
-
-    /// Variant of [SpHeader::new_for_tc] which sets the sequence flag field to [SequenceFlags::Unsegmented].
-    ///
-    /// This is an unchecked constructor which can panic on invalid input.
-    #[inline]
-    pub const fn new_for_unseg_tc(apid: u16, seq_count: u16, data_len: u16) -> Self {
-        Self::new_for_tc(apid, SequenceFlags::Unsegmented, seq_count, data_len)
-    }
-
-    /// Variant of [SpHeader::new_for_tm] which sets the sequence flag field to [SequenceFlags::Unsegmented].
-    ///
-    /// This is an unchecked constructor which can panic on invalid input.
-    #[inline]
-    pub const fn new_for_unseg_tm(apid: u16, seq_count: u16, data_len: u16) -> Self {
-        Self::new_for_tm(apid, SequenceFlags::Unsegmented, seq_count, data_len)
-    }
-
-    delegate! {
-        to self.packet_id {
         /// Returns [false] and fails if the APID exceeds [MAX_APID]
-            #[inline]
         pub fn set_apid(&mut self, apid: u16) -> bool;
-        }
+    });
-    }
 
-    delegate! {
+    delegate!(to self.psc {
-        to self.psc {
         /// Returns [false] and fails if the sequence count exceeds [MAX_SEQ_COUNT]
-            #[inline]
         pub fn set_seq_count(&mut self, seq_count: u16) -> bool;
-        }
+    });
-    }
 
-    #[inline]
     pub fn set_seq_flags(&mut self, seq_flags: SequenceFlags) {
         self.psc.seq_flags = seq_flags;
     }
 
-    #[inline]
     pub fn set_sec_header_flag(&mut self) {
         self.packet_id.sec_header_flag = true;
     }
 
-    #[inline]
     pub fn clear_sec_header_flag(&mut self) {
         self.packet_id.sec_header_flag = false;
     }
 
-    #[inline]
     pub fn set_packet_type(&mut self, packet_type: PacketType) {
         self.packet_id.ptype = packet_type;
     }
@@ -697,8 +598,8 @@ impl SpHeader {
                 expected: CCSDS_HEADER_LEN,
             });
         }
-        let zc_header = zc::SpHeader::read_from_bytes(&buf[0..CCSDS_HEADER_LEN])
+        let zc_header = zc::SpHeader::from_bytes(&buf[0..CCSDS_HEADER_LEN])
-            .map_err(|_| ByteConversionError::ZeroCopyFromError)?;
+            .ok_or(ByteConversionError::ZeroCopyFromError)?;
         Ok((Self::from(zc_header), &buf[CCSDS_HEADER_LEN..]))
     }
 
@@ -716,19 +617,10 @@ impl SpHeader {
         }
         let zc_header: zc::SpHeader = zc::SpHeader::from(*self);
         zc_header
-            .write_to(&mut buf[0..CCSDS_HEADER_LEN])
+            .to_bytes(&mut buf[0..CCSDS_HEADER_LEN])
-            .map_err(|_| ByteConversionError::ZeroCopyToError)?;
+            .ok_or(ByteConversionError::ZeroCopyToError)?;
         Ok(&mut buf[CCSDS_HEADER_LEN..])
     }
-
-    /// Create a vector containing the CCSDS header.
-    #[cfg(feature = "alloc")]
-    pub fn to_vec(&self) -> alloc::vec::Vec<u8> {
-        let mut vec = alloc::vec![0; CCSDS_HEADER_LEN];
-        // This can not fail.
-        self.write_to_be_bytes(&mut vec[..]).unwrap();
-        vec
-    }
 }
 
 impl CcsdsPacket for SpHeader {
@@ -754,7 +646,6 @@ impl CcsdsPacket for SpHeader {
 }
 
 impl CcsdsPrimaryHeader for SpHeader {
-    #[inline]
     fn from_composite_fields(
         packet_id: PacketId,
         psc: PacketSequenceCtrl,
@@ -779,9 +670,9 @@ sph_from_other!(SpHeader, crate::zc::SpHeader);
 pub mod zc {
     use crate::{CcsdsPacket, CcsdsPrimaryHeader, PacketId, PacketSequenceCtrl, VERSION_MASK};
     use zerocopy::byteorder::NetworkEndian;
-    use zerocopy::{FromBytes, Immutable, IntoBytes, Unaligned, U16};
+    use zerocopy::{AsBytes, FromBytes, FromZeroes, Unaligned, U16};
 
-    #[derive(FromBytes, IntoBytes, Immutable, Unaligned, Debug)]
+    #[derive(FromBytes, FromZeroes, AsBytes, Unaligned, Debug)]
     #[repr(C)]
     pub struct SpHeader {
         version_packet_id: U16<NetworkEndian>,
@@ -806,6 +697,14 @@ pub mod zc {
                 data_len: U16::from(data_len),
             }
         }
+
+        pub fn from_bytes(slice: &[u8]) -> Option<Self> {
+            SpHeader::read_from(slice)
+        }
+
+        pub fn to_bytes(&self, slice: &mut [u8]) -> Option<()> {
+            self.write_to(slice)
+        }
     }
 
     impl CcsdsPacket for SpHeader {
@@ -814,12 +713,9 @@ pub mod zc {
             ((self.version_packet_id.get() >> 13) as u8) & 0b111
         }
 
-        #[inline]
         fn packet_id(&self) -> PacketId {
             PacketId::from(self.packet_id_raw())
         }
-
-        #[inline]
         fn psc(&self) -> PacketSequenceCtrl {
             PacketSequenceCtrl::from(self.psc_raw())
         }
@@ -829,12 +725,10 @@ pub mod zc {
             self.data_len.get()
         }
 
-        #[inline]
         fn packet_id_raw(&self) -> u16 {
             self.version_packet_id.get() & (!VERSION_MASK)
         }
 
-        #[inline]
         fn psc_raw(&self) -> u16 {
             self.psc.get()
         }
@@ -858,8 +752,6 @@ pub mod zc {
 pub(crate) mod tests {
     use std::collections::HashSet;
 
-    #[allow(unused_imports)]
-    use crate::ByteConversionError;
     #[cfg(feature = "serde")]
     use crate::CcsdsPrimaryHeader;
     use crate::{
@@ -874,15 +766,14 @@ pub(crate) mod tests {
     use postcard::{from_bytes, to_allocvec};
     #[cfg(feature = "serde")]
     use serde::{de::DeserializeOwned, Serialize};
-    use zerocopy::FromBytes;
 
     const CONST_SP: SpHeader = SpHeader::new(
-        PacketId::new_for_tc(true, 0x36),
+        PacketId::const_tc(true, 0x36),
-        PacketSequenceCtrl::new(SequenceFlags::ContinuationSegment, 0x88),
+        PacketSequenceCtrl::const_new(SequenceFlags::ContinuationSegment, 0x88),
         0x90,
     );
 
-    const PACKET_ID_TM: PacketId = PacketId::new_for_tm(true, 0x22);
+    const PACKET_ID_TM: PacketId = PacketId::const_tm(true, 0x22);
 
     #[cfg(feature = "serde")]
     pub(crate) fn generic_serde_test<T: Serialize + DeserializeOwned + PartialEq + Debug>(
@@ -894,12 +785,11 @@ pub(crate) mod tests {
     }
 
     #[test]
-    #[allow(clippy::assertions_on_constants)]
     fn verify_const_packet_id() {
         assert_eq!(PACKET_ID_TM.apid(), 0x22);
         assert!(PACKET_ID_TM.sec_header_flag);
         assert_eq!(PACKET_ID_TM.ptype, PacketType::Tm);
-        let const_tc_id = PacketId::new_for_tc(true, 0x23);
+        let const_tc_id = PacketId::const_tc(true, 0x23);
         assert_eq!(const_tc_id.ptype, PacketType::Tc);
     }
 
@@ -908,32 +798,32 @@ pub(crate) mod tests {
         let id_default = PacketId::default();
         assert_eq!(id_default.ptype, PacketType::Tm);
         assert_eq!(id_default.apid, 0x000);
-        assert!(!id_default.sec_header_flag);
+        assert_eq!(id_default.sec_header_flag, false);
     }
 
     #[test]
     fn test_packet_id_ctors() {
-        let packet_id = PacketId::new_checked(PacketType::Tc, true, 0x1ff);
+        let packet_id = PacketId::new(PacketType::Tc, true, 0x1ff);
         assert!(packet_id.is_some());
         let packet_id = packet_id.unwrap();
         assert_eq!(packet_id.apid(), 0x1ff);
         assert_eq!(packet_id.ptype, PacketType::Tc);
-        assert!(packet_id.sec_header_flag);
+        assert_eq!(packet_id.sec_header_flag, true);
-        let packet_id_tc = PacketId::new_for_tc_checked(true, 0x1ff);
+        let packet_id_tc = PacketId::tc(true, 0x1ff);
         assert!(packet_id_tc.is_some());
         let packet_id_tc = packet_id_tc.unwrap();
         assert_eq!(packet_id_tc, packet_id);
-        let packet_id_tm = PacketId::new_for_tm_checked(true, 0x2ff);
+        let packet_id_tm = PacketId::tm(true, 0x2ff);
         assert!(packet_id_tm.is_some());
         let packet_id_tm = packet_id_tm.unwrap();
-        assert!(packet_id_tm.sec_header_flag);
+        assert_eq!(packet_id_tm.sec_header_flag, true);
         assert_eq!(packet_id_tm.ptype, PacketType::Tm);
         assert_eq!(packet_id_tm.apid, 0x2ff);
     }
 
     #[test]
     fn verify_const_sp_header() {
-        assert!(CONST_SP.sec_header_flag());
+        assert_eq!(CONST_SP.sec_header_flag(), true);
         assert_eq!(CONST_SP.apid(), 0x36);
         assert_eq!(
             CONST_SP.sequence_flags(),
@@ -974,7 +864,7 @@ pub(crate) mod tests {
     #[test]
     fn test_packet_id() {
         let packet_id =
-            PacketId::new_checked(PacketType::Tm, false, 0x42).expect("Packet ID creation failed");
+            PacketId::new(PacketType::Tm, false, 0x42).expect("Packet ID creation failed");
         assert_eq!(packet_id.raw(), 0x0042);
         let packet_id_from_raw = PacketId::from(packet_id.raw());
         assert_eq!(
@@ -982,26 +872,26 @@ pub(crate) mod tests {
             PacketType::Tm
         );
         assert_eq!(packet_id_from_raw, packet_id);
-        let packet_id_from_new = PacketId::new_checked(PacketType::Tm, false, 0x42).unwrap();
+        let packet_id_from_new = PacketId::new(PacketType::Tm, false, 0x42).unwrap();
         assert_eq!(packet_id_from_new, packet_id);
     }
 
     #[test]
     fn test_invalid_packet_id() {
-        let packet_id_invalid = PacketId::new_checked(PacketType::Tc, true, 0xFFFF);
+        let packet_id_invalid = PacketId::new(PacketType::Tc, true, 0xFFFF);
         assert!(packet_id_invalid.is_none());
     }
 
     #[test]
     fn test_invalid_apid_setter() {
         let mut packet_id =
-            PacketId::new_checked(PacketType::Tm, false, 0x42).expect("Packet ID creation failed");
+            PacketId::new(PacketType::Tm, false, 0x42).expect("Packet ID creation failed");
         assert!(!packet_id.set_apid(0xffff));
     }
 
     #[test]
     fn test_invalid_seq_count() {
-        let mut psc = PacketSequenceCtrl::new_checked(SequenceFlags::ContinuationSegment, 77)
+        let mut psc = PacketSequenceCtrl::new(SequenceFlags::ContinuationSegment, 77)
             .expect("PSC creation failed");
         assert_eq!(psc.seq_count(), 77);
         assert!(!psc.set_seq_count(0xffff));
@@ -1009,7 +899,7 @@ pub(crate) mod tests {
 
     #[test]
     fn test_packet_seq_ctrl() {
-        let mut psc = PacketSequenceCtrl::new_checked(SequenceFlags::ContinuationSegment, 77)
+        let mut psc = PacketSequenceCtrl::new(SequenceFlags::ContinuationSegment, 77)
             .expect("PSC creation failed");
         assert_eq!(psc.raw(), 77);
         let psc_from_raw = PacketSequenceCtrl::from(psc.raw());
@@ -1018,18 +908,16 @@ pub(crate) mod tests {
         assert!(!psc.set_seq_count(2u16.pow(15)));
         assert_eq!(psc.raw(), 77);
 
-        let psc_invalid = PacketSequenceCtrl::new_checked(SequenceFlags::FirstSegment, 0xFFFF);
+        let psc_invalid = PacketSequenceCtrl::new(SequenceFlags::FirstSegment, 0xFFFF);
         assert!(psc_invalid.is_none());
-        let psc_from_new =
+        let psc_from_new = PacketSequenceCtrl::new(SequenceFlags::ContinuationSegment, 77).unwrap();
-            PacketSequenceCtrl::new_checked(SequenceFlags::ContinuationSegment, 77).unwrap();
         assert_eq!(psc_from_new, psc);
     }
 
     #[test]
     #[cfg(feature = "serde")]
     fn test_serde_sph() {
-        let sp_header =
+        let sp_header = SpHeader::tc_unseg(0x42, 12, 0).expect("Error creating SP header");
-            SpHeader::new_for_unseg_tc_checked(0x42, 12, 0).expect("Error creating SP header");
         assert_eq!(sp_header.ccsds_version(), 0b000);
         assert!(sp_header.is_tc());
         assert!(!sp_header.sec_header_flag());
@@ -1051,8 +939,7 @@ pub(crate) mod tests {
         assert_eq!(sp_header.ccsds_version(), 0b000);
         assert_eq!(sp_header.data_len, 0);
 
-        let sp_header =
+        let sp_header = SpHeader::tm_unseg(0x7, 22, 36).expect("Error creating SP header");
-            SpHeader::new_for_unseg_tm_checked(0x7, 22, 36).expect("Error creating SP header");
         assert_eq!(sp_header.ccsds_version(), 0b000);
         assert!(sp_header.is_tm());
         assert!(!sp_header.sec_header_flag());
@@ -1066,8 +953,8 @@ pub(crate) mod tests {
         assert_eq!(sp_header.ccsds_version(), 0b000);
 
         let from_comp_fields = SpHeader::from_composite_fields(
-            PacketId::new(PacketType::Tc, true, 0x42),
+            PacketId::new(PacketType::Tc, true, 0x42).unwrap(),
-            PacketSequenceCtrl::new(SequenceFlags::Unsegmented, 0x7),
+            PacketSequenceCtrl::new(SequenceFlags::Unsegmented, 0x7).unwrap(),
             0,
             None,
         );
@@ -1084,7 +971,7 @@ pub(crate) mod tests {
 
     #[test]
     fn test_setters() {
-        let sp_header = SpHeader::new_for_tc_checked(0x42, SequenceFlags::Unsegmented, 25, 0);
+        let sp_header = SpHeader::tc(0x42, SequenceFlags::Unsegmented, 25, 0);
         assert!(sp_header.is_some());
         let mut sp_header = sp_header.unwrap();
         sp_header.set_apid(0x12);
@@ -1102,7 +989,7 @@ pub(crate) mod tests {
 
     #[test]
     fn test_tc_ctor() {
-        let sp_header = SpHeader::new_for_tc_checked(0x42, SequenceFlags::Unsegmented, 25, 0);
+        let sp_header = SpHeader::tc(0x42, SequenceFlags::Unsegmented, 25, 0);
         assert!(sp_header.is_some());
         let sp_header = sp_header.unwrap();
         verify_sp_fields(PacketType::Tc, &sp_header);
@@ -1110,35 +997,23 @@ pub(crate) mod tests {
 
     #[test]
     fn test_tc_ctor_unseg() {
-        let sp_header = SpHeader::new_for_unseg_tc_checked(0x42, 25, 0);
+        let sp_header = SpHeader::tc_unseg(0x42, 25, 0);
         assert!(sp_header.is_some());
         let sp_header = sp_header.unwrap();
         verify_sp_fields(PacketType::Tc, &sp_header);
     }
 
-    #[test]
-    fn test_tc_ctor_unseg_const() {
-        let sp_header = SpHeader::new_for_unseg_tc(0x42, 25, 0);
-        verify_sp_fields(PacketType::Tc, &sp_header);
-    }
-
     #[test]
     fn test_tm_ctor() {
-        let sp_header = SpHeader::new_for_tm_checked(0x42, SequenceFlags::Unsegmented, 25, 0);
+        let sp_header = SpHeader::tm(0x42, SequenceFlags::Unsegmented, 25, 0);
         assert!(sp_header.is_some());
         let sp_header = sp_header.unwrap();
         verify_sp_fields(PacketType::Tm, &sp_header);
     }
 
-    #[test]
-    fn test_tm_ctor_const() {
-        let sp_header = SpHeader::new_for_tm(0x42, SequenceFlags::Unsegmented, 25, 0);
-        verify_sp_fields(PacketType::Tm, &sp_header);
-    }
-
     #[test]
     fn test_tm_ctor_unseg() {
-        let sp_header = SpHeader::new_for_unseg_tm_checked(0x42, 25, 0);
+        let sp_header = SpHeader::tm_unseg(0x42, 25, 0);
         assert!(sp_header.is_some());
         let sp_header = sp_header.unwrap();
         verify_sp_fields(PacketType::Tm, &sp_header);
@@ -1154,10 +1029,10 @@ pub(crate) mod tests {
 
     #[test]
     fn test_zc_sph() {
-        use zerocopy::IntoBytes;
+        use zerocopy::AsBytes;
 
-        let sp_header = SpHeader::new_for_unseg_tc_checked(0x7FF, pow(2, 14) - 1, 0)
+        let sp_header =
-            .expect("Error creating SP header");
+            SpHeader::tc_unseg(0x7FF, pow(2, 14) - 1, 0).expect("Error creating SP header");
         assert_eq!(sp_header.ptype(), PacketType::Tc);
         assert_eq!(sp_header.apid(), 0x7FF);
         assert_eq!(sp_header.data_len(), 0);
@@ -1174,7 +1049,7 @@ pub(crate) mod tests {
         assert_eq!(slice[5], 0x00);
 
         let mut slice = [0; 6];
-        sp_header_zc.write_to(slice.as_mut_slice()).unwrap();
+        sp_header_zc.write_to(slice.as_mut_slice());
         assert_eq!(slice.len(), 6);
         assert_eq!(slice[0], 0x17);
         assert_eq!(slice[1], 0xFF);
@@ -1185,7 +1060,7 @@ pub(crate) mod tests {
 
         let mut test_vec = vec![0_u8; 6];
         let slice = test_vec.as_mut_slice();
-        sp_header_zc.write_to(slice).unwrap();
+        sp_header_zc.write_to(slice);
         let slice = test_vec.as_slice();
         assert_eq!(slice.len(), 6);
         assert_eq!(slice[0], 0x17);
@@ -1195,8 +1070,8 @@ pub(crate) mod tests {
         assert_eq!(slice[4], 0x00);
         assert_eq!(slice[5], 0x00);
 
-        let sp_header = zc::SpHeader::read_from_bytes(slice);
+        let sp_header = zc::SpHeader::from_bytes(slice);
-        assert!(sp_header.is_ok());
+        assert!(sp_header.is_some());
         let sp_header = sp_header.unwrap();
         assert_eq!(sp_header.ccsds_version(), 0b000);
         assert_eq!(sp_header.packet_id_raw(), 0x17FF);
@@ -1222,40 +1097,4 @@ pub(crate) mod tests {
         let mut id_set = HashSet::new();
         id_set.insert(PacketId::from(1_u16));
     }
-
-    #[test]
-    fn sp_header_from_apid() {
-        let sp_header = SpHeader::new_from_apid(0x03);
-        assert_eq!(sp_header.apid(), 0x03);
-        assert_eq!(sp_header.data_len(), 0);
-    }
-
-    #[test]
-    fn sp_header_from_apid_checked() {
-        let sp_header = SpHeader::new_from_apid_checked(0x03).unwrap();
-        assert_eq!(sp_header.apid(), 0x03);
-        assert_eq!(sp_header.data_len(), 0);
-    }
-
-    #[cfg(feature = "defmt")]
-    fn is_defmt_format<T: defmt::Format>(_t: T) {}
-
-    #[test]
-    #[cfg(feature = "defmt")]
-    fn test_defmt_format() {
-        is_defmt_format(ByteConversionError::ToSliceTooSmall {
-            found: 1,
-            expected: 2,
-        });
-    }
-
-    #[test]
-    fn test_sp_header_as_vec() {
-        let sp_header = SpHeader::new_for_unseg_tc(0x42, 25, 1);
-        let sp_header_as_vec = sp_header.to_vec();
-        let sp_header_read_back = SpHeader::from_be_bytes(&sp_header_as_vec)
-            .expect("Error reading back SP header")
-            .0;
-        assert_eq!(sp_header, sp_header_read_back);
-    }
 }

src/seq_count.rs

@@ -1,250 +0,0 @@
-use crate::MAX_SEQ_COUNT;
-use core::cell::Cell;
-use paste::paste;
-#[cfg(feature = "std")]
-pub use stdmod::*;
-
-/// Core trait for objects which can provide a sequence count.
-///
-/// The core functions are not mutable on purpose to allow easier usage with
-/// static structs when using the interior mutability pattern. This can be achieved by using
-/// [Cell], [core::cell::RefCell] or atomic types.
-pub trait SequenceCountProvider {
-    type Raw: Into<u64>;
-    const MAX_BIT_WIDTH: usize;
-
-    fn get(&self) -> Self::Raw;
-
-    fn increment(&self);
-
-    fn get_and_increment(&self) -> Self::Raw {
-        let val = self.get();
-        self.increment();
-        val
-    }
-}
-
-#[derive(Clone)]
-pub struct SeqCountProviderSimple<T: Copy> {
-    seq_count: Cell<T>,
-    max_val: T,
-}
-
-macro_rules! impl_for_primitives {
-    ($($ty: ident,)+) => {
-        $(
-            paste! {
-                impl SeqCountProviderSimple<$ty> {
-                    pub fn [<new_custom_max_val_ $ty>](max_val: $ty) -> Self {
-                        Self {
-                            seq_count: Cell::new(0),
-                            max_val,
-                        }
-                    }
-                    pub fn [<new_ $ty>]() -> Self {
-                        Self {
-                            seq_count: Cell::new(0),
-                            max_val: $ty::MAX
-                        }
-                    }
-                }
-
-                impl Default for SeqCountProviderSimple<$ty> {
-                    fn default() -> Self {
-                        Self::[<new_ $ty>]()
-                    }
-                }
-
-                impl SequenceCountProvider for SeqCountProviderSimple<$ty> {
-                    type Raw = $ty;
-                    const MAX_BIT_WIDTH: usize = core::mem::size_of::<Self::Raw>() * 8;
-
-                    fn get(&self) -> Self::Raw {
-                        self.seq_count.get()
-                    }
-
-                    fn increment(&self) {
-                        self.get_and_increment();
-                    }
-
-                    fn get_and_increment(&self) -> Self::Raw {
-                        let curr_count = self.seq_count.get();
-
-                        if curr_count == self.max_val {
-                            self.seq_count.set(0);
-                        } else {
-                            self.seq_count.set(curr_count + 1);
-                        }
-                        curr_count
-                    }
-                }
-            }
-        )+
-    }
-}
-
-impl_for_primitives!(u8, u16, u32, u64,);
-
-/// This is a sequence count provider which wraps around at [MAX_SEQ_COUNT].
-#[derive(Clone)]
-pub struct CcsdsSimpleSeqCountProvider {
-    provider: SeqCountProviderSimple<u16>,
-}
-
-impl Default for CcsdsSimpleSeqCountProvider {
-    fn default() -> Self {
-        Self {
-            provider: SeqCountProviderSimple::new_custom_max_val_u16(MAX_SEQ_COUNT),
-        }
-    }
-}
-
-impl SequenceCountProvider for CcsdsSimpleSeqCountProvider {
-    type Raw = u16;
-    const MAX_BIT_WIDTH: usize = core::mem::size_of::<Self::Raw>() * 8;
-    delegate::delegate! {
-        to self.provider {
-            fn get(&self) -> u16;
-            fn increment(&self);
-            fn get_and_increment(&self) -> u16;
-        }
-    }
-}
-
-#[cfg(feature = "std")]
-pub mod stdmod {
-    use super::*;
-    use std::sync::{Arc, Mutex};
-
-    macro_rules! sync_clonable_seq_counter_impl {
-         ($($ty: ident,)+) => {
-             $(paste! {
-                 /// These sequence counters can be shared between threads and can also be
-                 /// configured to wrap around at specified maximum values. Please note that
-                 /// that the API provided by this class will not panic und [Mutex] lock errors,
-                 /// but it will yield 0 for the getter functions.
-                 #[derive(Clone, Default)]
-                 pub struct [<SeqCountProviderSync $ty:upper>] {
-                     seq_count: Arc<Mutex<$ty>>,
-                     max_val: $ty
-                 }
-
-                 impl [<SeqCountProviderSync $ty:upper>] {
-                     pub fn new() -> Self {
-                        Self::new_with_max_val($ty::MAX)
-                     }
-
-                     pub fn new_with_max_val(max_val: $ty) -> Self {
-                         Self {
-                             seq_count: Arc::default(),
-                             max_val
-                         }
-                     }
-                 }
-                 impl SequenceCountProvider for [<SeqCountProviderSync $ty:upper>] {
-                    type Raw = $ty;
-                    const MAX_BIT_WIDTH: usize = core::mem::size_of::<Self::Raw>() * 8;
-
-                    fn get(&self) -> $ty {
-                        match self.seq_count.lock() {
-                            Ok(counter) => *counter,
-                            Err(_) => 0
-                        }
-                    }
-
-                    fn increment(&self) {
-                        self.get_and_increment();
-                    }
-
-                    fn get_and_increment(&self) -> $ty {
-                        match self.seq_count.lock() {
-                            Ok(mut counter) => {
-                                let val = *counter;
-                                if val == self.max_val {
-                                    *counter = 0;
-                                } else {
-                                    *counter += 1;
-                                }
-                                val
-                            }
-                            Err(_) => 0,
-                        }
-                    }
-                 }
-             })+
-         }
-    }
-    sync_clonable_seq_counter_impl!(u8, u16, u32, u64,);
-}
-
-#[cfg(test)]
-mod tests {
-    use crate::seq_count::{
-        CcsdsSimpleSeqCountProvider, SeqCountProviderSimple, SeqCountProviderSyncU8,
-        SequenceCountProvider,
-    };
-    use crate::MAX_SEQ_COUNT;
-
-    #[test]
-    fn test_u8_counter() {
-        let u8_counter = SeqCountProviderSimple::<u8>::default();
-        assert_eq!(u8_counter.get(), 0);
-        assert_eq!(u8_counter.get_and_increment(), 0);
-        assert_eq!(u8_counter.get_and_increment(), 1);
-        assert_eq!(u8_counter.get(), 2);
-    }
-
-    #[test]
-    fn test_u8_counter_overflow() {
-        let u8_counter = SeqCountProviderSimple::new_u8();
-        for _ in 0..256 {
-            u8_counter.increment();
-        }
-        assert_eq!(u8_counter.get(), 0);
-    }
-
-    #[test]
-    fn test_ccsds_counter() {
-        let ccsds_counter = CcsdsSimpleSeqCountProvider::default();
-        assert_eq!(ccsds_counter.get(), 0);
-        assert_eq!(ccsds_counter.get_and_increment(), 0);
-        assert_eq!(ccsds_counter.get_and_increment(), 1);
-        assert_eq!(ccsds_counter.get(), 2);
-    }
-
-    #[test]
-    fn test_ccsds_counter_overflow() {
-        let ccsds_counter = CcsdsSimpleSeqCountProvider::default();
-        for _ in 0..MAX_SEQ_COUNT + 1 {
-            ccsds_counter.increment();
-        }
-        assert_eq!(ccsds_counter.get(), 0);
-    }
-
-    #[test]
-    fn test_atomic_ref_counters() {
-        let sync_u8_counter = SeqCountProviderSyncU8::new();
-        assert_eq!(sync_u8_counter.get(), 0);
-        assert_eq!(sync_u8_counter.get_and_increment(), 0);
-        assert_eq!(sync_u8_counter.get_and_increment(), 1);
-        assert_eq!(sync_u8_counter.get(), 2);
-    }
-
-    #[test]
-    fn test_atomic_ref_counters_overflow() {
-        let sync_u8_counter = SeqCountProviderSyncU8::new();
-        for _ in 0..u8::MAX as u16 + 1 {
-            sync_u8_counter.increment();
-        }
-        assert_eq!(sync_u8_counter.get(), 0);
-    }
-
-    #[test]
-    fn test_atomic_ref_counters_overflow_custom_max_val() {
-        let sync_u8_counter = SeqCountProviderSyncU8::new_with_max_val(128);
-        for _ in 0..129 {
-            sync_u8_counter.increment();
-        }
-        assert_eq!(sync_u8_counter.get(), 0);
-    }
-}

src/time/ascii.rs

@@ -40,11 +40,13 @@ pub mod alloc_mod_chrono {
     };
 
     /// Generates a time code formatter using the [FMT_STR_CODE_A_WITH_SIZE] format.
+    #[cfg_attr(doc_cfg, doc(cfg(all(feature = "alloc", feature = "chrono"))))]
     pub fn generate_time_code_a(date: &DateTime<Utc>) -> DelayedFormat<StrftimeItems<'static>> {
         date.format(FMT_STR_CODE_A_WITH_SIZE.0)
     }
 
     /// Generates a time code formatter using the [FMT_STR_CODE_A_TERMINATED_WITH_SIZE] format.
+    #[cfg_attr(doc_cfg, doc(cfg(all(feature = "alloc", feature = "chrono"))))]
     pub fn generate_time_code_a_terminated(
         date: &DateTime<Utc>,
     ) -> DelayedFormat<StrftimeItems<'static>> {
@@ -52,11 +54,13 @@ pub mod alloc_mod_chrono {
     }
 
     /// Generates a time code formatter using the [FMT_STR_CODE_B_WITH_SIZE] format.
+    #[cfg_attr(doc_cfg, doc(cfg(all(feature = "alloc", feature = "chrono"))))]
     pub fn generate_time_code_b(date: &DateTime<Utc>) -> DelayedFormat<StrftimeItems<'static>> {
         date.format(FMT_STR_CODE_B_WITH_SIZE.0)
     }
 
     /// Generates a time code formatter using the [FMT_STR_CODE_B_TERMINATED_WITH_SIZE] format.
+    #[cfg_attr(doc_cfg, doc(cfg(all(feature = "alloc", feature = "chrono"))))]
     pub fn generate_time_code_b_terminated(
         date: &DateTime<Utc>,
     ) -> DelayedFormat<StrftimeItems<'static>> {
@@ -71,19 +75,7 @@ mod tests {
     use std::format;
 
     #[test]
-    fn test_ascii_timestamp_a_unterminated_epoch() {
+    fn test_ascii_timestamp_a_unterminated() {
-        let date = chrono::DateTime::UNIX_EPOCH;
-        let stamp_formatter = generate_time_code_a(&date);
-        let stamp = format!("{}", stamp_formatter);
-        let t_sep = stamp.find('T');
-        assert!(t_sep.is_some());
-        assert_eq!(t_sep.unwrap(), 10);
-        assert_eq!(stamp.len(), FMT_STR_CODE_A_WITH_SIZE.1);
-    }
-
-    #[test]
-    #[cfg_attr(miri, ignore)]
-    fn test_ascii_timestamp_a_unterminated_now() {
         let date = Utc::now();
         let stamp_formatter = generate_time_code_a(&date);
         let stamp = format!("{}", stamp_formatter);
@@ -94,24 +86,7 @@ mod tests {
     }
 
     #[test]
-    fn test_ascii_timestamp_a_terminated_epoch() {
+    fn test_ascii_timestamp_a_terminated() {
-        let date = chrono::DateTime::UNIX_EPOCH;
-        let stamp_formatter = generate_time_code_a_terminated(&date);
-        let stamp = format!("{}", stamp_formatter);
-        let t_sep = stamp.find('T');
-        assert!(t_sep.is_some());
-        assert_eq!(t_sep.unwrap(), 10);
-        let z_terminator = stamp.find('Z');
-        assert!(z_terminator.is_some());
-        assert_eq!(
-            z_terminator.unwrap(),
-            FMT_STR_CODE_A_TERMINATED_WITH_SIZE.1 - 1
-        );
-        assert_eq!(stamp.len(), FMT_STR_CODE_A_TERMINATED_WITH_SIZE.1);
-    }
-    #[test]
-    #[cfg_attr(miri, ignore)]
-    fn test_ascii_timestamp_a_terminated_now() {
         let date = Utc::now();
         let stamp_formatter = generate_time_code_a_terminated(&date);
         let stamp = format!("{}", stamp_formatter);
@@ -128,19 +103,7 @@ mod tests {
     }
 
     #[test]
-    fn test_ascii_timestamp_b_unterminated_epoch() {
+    fn test_ascii_timestamp_b_unterminated() {
-        let date = chrono::DateTime::UNIX_EPOCH;
-        let stamp_formatter = generate_time_code_b(&date);
-        let stamp = format!("{}", stamp_formatter);
-        let t_sep = stamp.find('T');
-        assert!(t_sep.is_some());
-        assert_eq!(t_sep.unwrap(), 8);
-        assert_eq!(stamp.len(), FMT_STR_CODE_B_WITH_SIZE.1);
-    }
-
-    #[test]
-    #[cfg_attr(miri, ignore)]
-    fn test_ascii_timestamp_b_unterminated_now() {
         let date = Utc::now();
         let stamp_formatter = generate_time_code_b(&date);
         let stamp = format!("{}", stamp_formatter);
@@ -151,25 +114,7 @@ mod tests {
     }
 
     #[test]
-    fn test_ascii_timestamp_b_terminated_epoch() {
+    fn test_ascii_timestamp_b_terminated() {
-        let date = chrono::DateTime::UNIX_EPOCH;
-        let stamp_formatter = generate_time_code_b_terminated(&date);
-        let stamp = format!("{}", stamp_formatter);
-        let t_sep = stamp.find('T');
-        assert!(t_sep.is_some());
-        assert_eq!(t_sep.unwrap(), 8);
-        let z_terminator = stamp.find('Z');
-        assert!(z_terminator.is_some());
-        assert_eq!(
-            z_terminator.unwrap(),
-            FMT_STR_CODE_B_TERMINATED_WITH_SIZE.1 - 1
-        );
-        assert_eq!(stamp.len(), FMT_STR_CODE_B_TERMINATED_WITH_SIZE.1);
-    }
-
-    #[test]
-    #[cfg_attr(miri, ignore)]
-    fn test_ascii_timestamp_b_terminated_now() {
         let date = Utc::now();
         let stamp_formatter = generate_time_code_b_terminated(&date);
         let stamp = format!("{}", stamp_formatter);

src/time/cds.rs

@@ -1,19 +1,23 @@
 //! Module to generate or read CCSDS Day Segmented (CDS) timestamps as specified in
 //! [CCSDS 301.0-B-4](https://public.ccsds.org/Pubs/301x0b4e1.pdf) section 3.3 .
 //!
-//! The core data structure to do this is the [CdsTime] struct and the
+//! The core data structure to do this is the [TimeProvider] struct and the
 //! [get_dyn_time_provider_from_bytes] function to retrieve correct instances of the
 //! struct from a bytestream.
 use crate::private::Sealed;
 use crate::ByteConversionError;
 use core::cmp::Ordering;
-use core::fmt::Debug;
+use core::fmt::{Debug, Display, Formatter};
 use core::ops::{Add, AddAssign};
 use core::time::Duration;
 
+use delegate::delegate;
+
 #[cfg(feature = "std")]
 use super::StdTimestampError;
 #[cfg(feature = "std")]
+use std::error::Error;
+#[cfg(feature = "std")]
 use std::time::{SystemTime, SystemTimeError};
 
 #[cfg(feature = "chrono")]
@@ -30,9 +34,8 @@ use core::any::Any;
 use serde::{Deserialize, Serialize};
 
 use super::{
-    ccsds_to_unix_days, unix_to_ccsds_days, CcsdsTimeCode, CcsdsTimeProvider,
+    ccsds_to_unix_days, unix_to_ccsds_days, CcsdsTimeCode, CcsdsTimeProvider, TimeReader,
-    DateBeforeCcsdsEpochError, TimeReader, TimeWriter, TimestampError, UnixTime, MS_PER_DAY,
+    TimeWriter, TimestampError, UnixTime, MS_PER_DAY, SECONDS_PER_DAY,
-    SECONDS_PER_DAY,
 };
 
 /// Base value for the preamble field for a time field parser to determine the time field type.
@@ -55,7 +58,7 @@ pub trait ProvidesDaysLength: Sealed + Clone {
         + Into<i64>;
 }
 
-/// Type level token to be used as a generic parameter to [CdsTime].
+/// Type level token to be used as a generic parameter to [TimeProvider].
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Default)]
 pub struct DaysLen16Bits {}
 
@@ -64,7 +67,7 @@ impl ProvidesDaysLength for DaysLen16Bits {
     type FieldType = u16;
 }
 
-/// Type level token to be used as a generic parameter to [CdsTime].
+/// Type level token to be used as a generic parameter to [TimeProvider].
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Default)]
 pub struct DaysLen24Bits {}
 impl Sealed for DaysLen24Bits {}
@@ -74,7 +77,6 @@ impl ProvidesDaysLength for DaysLen24Bits {
 
 #[derive(Debug, PartialEq, Eq, Copy, Clone)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum LengthOfDaySegment {
     Short16Bits = 0,
     Long24Bits = 1,
@@ -89,21 +91,34 @@ pub enum SubmillisPrecision {
     Reserved = 0b11,
 }
 
-#[derive(Debug, PartialEq, Eq, Copy, Clone, thiserror::Error)]
+#[derive(Debug, PartialEq, Eq, Copy, Clone)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum CdsError {
     /// CCSDS days value exceeds maximum allowed size or is negative
-    #[error("invalid ccsds days {0}")]
     InvalidCcsdsDays(i64),
     /// There are distinct constructors depending on the days field width detected in the preamble
     /// field. This error will be returned if there is a missmatch.
-    #[error("wrong constructor for length of day {0:?} detected in preamble")]
     InvalidCtorForDaysOfLenInPreamble(LengthOfDaySegment),
-    #[error("date before CCSDS epoch: {0}")]
-    DateBeforeCcsdsEpoch(#[from] DateBeforeCcsdsEpochError),
 }
 
+impl Display for CdsError {
+    fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
+        match self {
+            CdsError::InvalidCcsdsDays(days) => {
+                write!(f, "invalid ccsds days {days}")
+            }
+            CdsError::InvalidCtorForDaysOfLenInPreamble(length_of_day) => {
+                write!(
+                    f,
+                    "wrong constructor for length of day {length_of_day:?} detected in preamble",
+                )
+            }
+        }
+    }
+}
+
+#[cfg(feature = "std")]
+impl Error for CdsError {}
 pub fn length_of_day_segment_from_pfield(pfield: u8) -> LengthOfDaySegment {
     if (pfield >> 2) & 0b1 == 1 {
         return LengthOfDaySegment::Long24Bits;
@@ -111,7 +126,6 @@ pub fn length_of_day_segment_from_pfield(pfield: u8) -> LengthOfDaySegment {
     LengthOfDaySegment::Short16Bits
 }
 
-#[inline]
 pub fn precision_from_pfield(pfield: u8) -> SubmillisPrecision {
     match pfield & 0b11 {
         0b01 => SubmillisPrecision::Microseconds,
@@ -142,19 +156,19 @@ pub fn precision_from_pfield(pfield: u8) -> SubmillisPrecision {
 ///
 /// ```
 /// use core::time::Duration;
-/// use spacepackets::time::cds::{CdsTime, length_of_day_segment_from_pfield, LengthOfDaySegment};
+/// use spacepackets::time::cds::{TimeProvider, length_of_day_segment_from_pfield, LengthOfDaySegment};
-/// use spacepackets::time::{TimeWriter, CcsdsTimeCode, CcsdsTimeProvider};
+/// use spacepackets::time::{TimeWriter, CcsdsTimeCodes, CcsdsTimeProvider};
 ///
-/// let timestamp_now = CdsTime::now_with_u16_days().unwrap();
+/// let timestamp_now = TimeProvider::from_now_with_u16_days().unwrap();
 /// let mut raw_stamp = [0; 7];
 /// {
 ///     let written = timestamp_now.write_to_bytes(&mut raw_stamp).unwrap();
-///     assert_eq!((raw_stamp[0] >> 4) & 0b111, CcsdsTimeCode::Cds as u8);
+///     assert_eq!((raw_stamp[0] >> 4) & 0b111, CcsdsTimeCodes::Cds as u8);
 ///     assert_eq!(written, 7);
 /// }
 /// {
 ///     assert_eq!(length_of_day_segment_from_pfield(raw_stamp[0]), LengthOfDaySegment::Short16Bits);
-///     let read_result = CdsTime::from_bytes_with_u16_days(&raw_stamp);
+///     let read_result = TimeProvider::from_bytes_with_u16_days(&raw_stamp);
 ///     assert!(read_result.is_ok());
 ///     let stamp_deserialized = read_result.unwrap();
 ///     assert_eq!(stamp_deserialized.len_as_bytes(), 7);
@@ -174,7 +188,7 @@ pub struct CdsTime<DaysLen: ProvidesDaysLength = DaysLen16Bits> {
     submillis: u32,
     /// This is not strictly necessary but still cached because it significantly simplifies the
     /// calculation of [`DateTime<Utc>`].
-    unix_time: UnixTime,
+    unix_stamp: UnixTime,
 }
 
 /// Common properties for all CDS time providers.
@@ -212,11 +226,11 @@ impl ConversionFromUnix {
         unix_seconds: i64,
         subsec_nanos: u32,
         precision: SubmillisPrecision,
-    ) -> Result<Self, DateBeforeCcsdsEpochError> {
+    ) -> Result<Self, TimestampError> {
         let (unix_days, secs_of_day) = calc_unix_days_and_secs_of_day(unix_seconds);
         let ccsds_days = unix_to_ccsds_days(unix_days);
         if ccsds_days == 0 && (secs_of_day > 0 || subsec_nanos > 0) || ccsds_days < 0 {
-            return Err(DateBeforeCcsdsEpochError(
+            return Err(TimestampError::DateBeforeCcsdsEpoch(
                 UnixTime::new_checked(unix_seconds, subsec_nanos)
                     .expect("unix timestamp creation failed"),
             ));
@@ -239,70 +253,54 @@ impl ConversionFromUnix {
 }
 
 impl CdsCommon for ConversionFromUnix {
-    #[inline]
     fn submillis_precision(&self) -> SubmillisPrecision {
         self.submilis_prec
     }
 
-    #[inline]
     fn ms_of_day(&self) -> u32 {
         self.ms_of_day
     }
 
-    #[inline]
     fn ccsds_days_as_u32(&self) -> u32 {
         self.ccsds_days
     }
 
-    #[inline]
     fn submillis(&self) -> u32 {
         self.submillis
     }
 }
 
 impl CdsConverter for ConversionFromUnix {
-    #[inline]
     fn unix_days_seconds(&self) -> i64 {
         self.unix_days_seconds
     }
 }
-
 /// Helper struct which generates fields for the CDS time provider from a datetime.
-#[cfg(feature = "chrono")]
 struct ConversionFromChronoDatetime {
     unix_conversion: ConversionFromUnix,
     submillis_prec: SubmillisPrecision,
     submillis: u32,
 }
 
-#[cfg(feature = "chrono")]
 impl CdsCommon for ConversionFromChronoDatetime {
-    #[inline]
     fn submillis_precision(&self) -> SubmillisPrecision {
         self.submillis_prec
     }
 
-    delegate::delegate! {
+    delegate! {
         to self.unix_conversion {
-            #[inline]
             fn ms_of_day(&self) -> u32;
-            #[inline]
             fn ccsds_days_as_u32(&self) -> u32;
         }
     }
 
-    #[inline]
     fn submillis(&self) -> u32 {
         self.submillis
     }
 }
 
-#[cfg(feature = "chrono")]
 impl CdsConverter for ConversionFromChronoDatetime {
-    delegate::delegate! {to self.unix_conversion {
+    delegate! {to self.unix_conversion { fn unix_days_seconds(&self) -> i64; }}
-        #[inline]
-        fn unix_days_seconds(&self) -> i64;
-    }}
 }
 
 #[inline]
@@ -320,29 +318,30 @@ fn calc_unix_days_and_secs_of_day(unix_seconds: i64) -> (i64, u32) {
 
 #[cfg(feature = "chrono")]
 impl ConversionFromChronoDatetime {
-    fn new(dt: &chrono::DateTime<chrono::Utc>) -> Result<Self, DateBeforeCcsdsEpochError> {
+    fn new(dt: &chrono::DateTime<chrono::Utc>) -> Result<Self, TimestampError> {
         Self::new_generic(dt, SubmillisPrecision::Absent)
     }
 
     fn new_with_submillis_us_prec(
         dt: &chrono::DateTime<chrono::Utc>,
-    ) -> Result<Self, DateBeforeCcsdsEpochError> {
+    ) -> Result<Self, TimestampError> {
         Self::new_generic(dt, SubmillisPrecision::Microseconds)
     }
 
     fn new_with_submillis_ps_prec(
         dt: &chrono::DateTime<chrono::Utc>,
-    ) -> Result<Self, DateBeforeCcsdsEpochError> {
+    ) -> Result<Self, TimestampError> {
         Self::new_generic(dt, SubmillisPrecision::Picoseconds)
     }
 
+    #[cfg(feature = "chrono")]
     fn new_generic(
         dt: &chrono::DateTime<chrono::Utc>,
         prec: SubmillisPrecision,
-    ) -> Result<Self, DateBeforeCcsdsEpochError> {
+    ) -> Result<Self, TimestampError> {
         // The CDS timestamp does not support timestamps before the CCSDS epoch.
         if dt.year() < 1958 {
-            return Err(DateBeforeCcsdsEpochError(UnixTime::from(*dt)));
+            return Err(TimestampError::DateBeforeCcsdsEpoch(UnixTime::from(*dt)));
         }
         // The contained values in the conversion should be all positive now
         let unix_conversion =
@@ -417,7 +416,7 @@ impl CdsCommon for ConversionFromNow {
     fn submillis_precision(&self) -> SubmillisPrecision {
         self.submillis_prec
     }
-    delegate::delegate! {
+    delegate! {
         to self.unix_conversion {
             fn ms_of_day(&self) -> u32;
             fn ccsds_days_as_u32(&self) -> u32;
@@ -431,32 +430,35 @@ impl CdsCommon for ConversionFromNow {
 
 #[cfg(feature = "std")]
 impl CdsConverter for ConversionFromNow {
-    delegate::delegate! {to self.unix_conversion { fn unix_days_seconds(&self) -> i64; }}
+    delegate! {to self.unix_conversion { fn unix_days_seconds(&self) -> i64; }}
 }
 
 #[cfg(feature = "alloc")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "alloc")))]
 pub trait DynCdsTimeProvider: CcsdsTimeProvider + CdsTimestamp + TimeWriter + Any {}
 #[cfg(feature = "alloc")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "alloc")))]
 impl DynCdsTimeProvider for CdsTime<DaysLen16Bits> {}
 #[cfg(feature = "alloc")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "alloc")))]
 impl DynCdsTimeProvider for CdsTime<DaysLen24Bits> {}
 
-/// This function returns the correct [CdsTime] instance from a raw byte array
+/// This function returns the correct [TimeProvider] instance from a raw byte array
 /// by checking the length of days field. It also checks the CCSDS time code for correctness.
 ///
 /// # Example
 ///
 /// ```
 /// use spacepackets::time::cds::{
-///     CdsTime, LengthOfDaySegment, get_dyn_time_provider_from_bytes, SubmillisPrecision,
+///     TimeProvider, LengthOfDaySegment, get_dyn_time_provider_from_bytes, SubmillisPrecision,
 /// };
-/// use spacepackets::time::{TimeWriter, CcsdsTimeCode, CcsdsTimeProvider};
+/// use spacepackets::time::{TimeWriter, CcsdsTimeCodes, CcsdsTimeProvider};
 ///
-/// let timestamp_now = CdsTime::new_with_u16_days(24, 24);
+/// let timestamp_now = TimeProvider::new_with_u16_days(24, 24);
 /// let mut raw_stamp = [0; 7];
 /// {
 ///     let written = timestamp_now.write_to_bytes(&mut raw_stamp).unwrap();
-///     assert_eq!((raw_stamp[0] >> 4) & 0b111, CcsdsTimeCode::Cds as u8);
+///     assert_eq!((raw_stamp[0] >> 4) & 0b111, CcsdsTimeCodes::Cds as u8);
 ///     assert_eq!(written, 7);
 /// }
 /// {
@@ -468,6 +470,7 @@ impl DynCdsTimeProvider for CdsTime<DaysLen24Bits> {}
 /// }
 /// ```
 #[cfg(feature = "alloc")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "alloc")))]
 pub fn get_dyn_time_provider_from_bytes(
     buf: &[u8],
 ) -> Result<Box<dyn DynCdsTimeProvider>, TimestampError> {
@@ -569,7 +572,7 @@ impl<ProvidesDaysLen: ProvidesDaysLength> CdsTime<ProvidesDaysLen> {
             ));
         }
         let pfield = buf[0];
-        match CcsdsTimeCode::try_from((pfield >> 4) & 0b111) {
+        match CcsdsTimeCode::try_from(pfield >> 4 & 0b111) {
             Ok(cds_type) => match cds_type {
                 CcsdsTimeCode::Cds => (),
                 _ => {
@@ -582,7 +585,7 @@ impl<ProvidesDaysLen: ProvidesDaysLength> CdsTime<ProvidesDaysLen> {
             _ => {
                 return Err(TimestampError::InvalidTimeCode {
                     expected: CcsdsTimeCode::Cds,
-                    found: (pfield >> 4) & 0b111,
+                    found: pfield >> 4 & 0b111,
                 });
             }
         };
@@ -638,7 +641,7 @@ impl<ProvidesDaysLen: ProvidesDaysLength> CdsTime<ProvidesDaysLen> {
         if let Some(precision) = self.precision_as_ns() {
             subsec_nanos += precision;
         }
-        self.unix_time = UnixTime::new(unix_days_seconds, subsec_nanos);
+        self.unix_stamp = UnixTime::new(unix_days_seconds, subsec_nanos);
     }
 
     fn length_check(&self, buf: &[u8], len_as_bytes: usize) -> Result<(), TimestampError> {
@@ -665,7 +668,7 @@ impl<ProvidesDaysLen: ProvidesDaysLength> CdsTime<ProvidesDaysLen> {
             pfield: Self::generate_p_field(days_len, SubmillisPrecision::Absent),
             ccsds_days,
             ms_of_day,
-            unix_time: Default::default(),
+            unix_stamp: Default::default(),
             submillis: 0,
         };
         let unix_days_seconds = ccsds_to_unix_days(i64::from(ccsds_days)) * SECONDS_PER_DAY as i64;
@@ -677,7 +680,7 @@ impl<ProvidesDaysLen: ProvidesDaysLength> CdsTime<ProvidesDaysLen> {
     fn from_dt_generic(
         dt: &chrono::DateTime<chrono::Utc>,
         days_len: LengthOfDaySegment,
-    ) -> Result<Self, CdsError> {
+    ) -> Result<Self, TimestampError> {
         let conv_from_dt = ConversionFromChronoDatetime::new(dt)?;
         Self::generic_from_conversion(days_len, conv_from_dt)
     }
@@ -686,7 +689,7 @@ impl<ProvidesDaysLen: ProvidesDaysLength> CdsTime<ProvidesDaysLen> {
     fn from_dt_generic_us_prec(
         dt: &chrono::DateTime<chrono::Utc>,
         days_len: LengthOfDaySegment,
-    ) -> Result<Self, CdsError> {
+    ) -> Result<Self, TimestampError> {
         let conv_from_dt = ConversionFromChronoDatetime::new_with_submillis_us_prec(dt)?;
         Self::generic_from_conversion(days_len, conv_from_dt)
     }
@@ -695,7 +698,7 @@ impl<ProvidesDaysLen: ProvidesDaysLength> CdsTime<ProvidesDaysLen> {
     fn from_dt_generic_ps_prec(
         dt: &chrono::DateTime<chrono::Utc>,
         days_len: LengthOfDaySegment,
-    ) -> Result<Self, CdsError> {
+    ) -> Result<Self, TimestampError> {
         let conv_from_dt = ConversionFromChronoDatetime::new_with_submillis_ps_prec(dt)?;
         Self::generic_from_conversion(days_len, conv_from_dt)
     }
@@ -704,46 +707,48 @@ impl<ProvidesDaysLen: ProvidesDaysLength> CdsTime<ProvidesDaysLen> {
         unix_stamp: &UnixTime,
         days_len: LengthOfDaySegment,
         submillis_prec: SubmillisPrecision,
-    ) -> Result<Self, CdsError> {
+    ) -> Result<Self, TimestampError> {
         let conv_from_dt =
             ConversionFromUnix::new(unix_stamp.secs, unix_stamp.subsec_nanos, submillis_prec)?;
         Self::generic_from_conversion(days_len, conv_from_dt)
     }
 
     #[cfg(feature = "std")]
-    fn now_generic(days_len: LengthOfDaySegment) -> Result<Self, StdTimestampError> {
+    fn from_now_generic(days_len: LengthOfDaySegment) -> Result<Self, StdTimestampError> {
         let conversion_from_now = ConversionFromNow::new()?;
         Self::generic_from_conversion(days_len, conversion_from_now)
-            .map_err(|e| StdTimestampError::Timestamp(TimestampError::from(e)))
+            .map_err(StdTimestampError::Timestamp)
     }
 
     #[cfg(feature = "std")]
-    fn now_generic_with_us_prec(days_len: LengthOfDaySegment) -> Result<Self, StdTimestampError> {
+    fn from_now_generic_us_prec(days_len: LengthOfDaySegment) -> Result<Self, StdTimestampError> {
         let conversion_from_now = ConversionFromNow::new_with_submillis_us_prec()?;
         Self::generic_from_conversion(days_len, conversion_from_now)
-            .map_err(|e| StdTimestampError::Timestamp(TimestampError::from(e)))
+            .map_err(StdTimestampError::Timestamp)
     }
 
     #[cfg(feature = "std")]
     fn from_now_generic_ps_prec(days_len: LengthOfDaySegment) -> Result<Self, StdTimestampError> {
         let conversion_from_now = ConversionFromNow::new_with_submillis_ps_prec()?;
         Self::generic_from_conversion(days_len, conversion_from_now)
-            .map_err(|e| StdTimestampError::Timestamp(TimestampError::from(e)))
+            .map_err(StdTimestampError::Timestamp)
     }
 
     fn generic_from_conversion<C: CdsConverter>(
         days_len: LengthOfDaySegment,
         converter: C,
-    ) -> Result<Self, CdsError> {
+    ) -> Result<Self, TimestampError> {
-        let ccsds_days: ProvidesDaysLen::FieldType = converter
+        let ccsds_days: ProvidesDaysLen::FieldType =
-            .ccsds_days_as_u32()
+            converter.ccsds_days_as_u32().try_into().map_err(|_| {
-            .try_into()
+                TimestampError::Cds(CdsError::InvalidCcsdsDays(
-            .map_err(|_| CdsError::InvalidCcsdsDays(converter.ccsds_days_as_u32().into()))?;
+                    converter.ccsds_days_as_u32().into(),
+                ))
+            })?;
         let mut provider = Self {
             pfield: Self::generate_p_field(days_len, converter.submillis_precision()),
             ccsds_days,
             ms_of_day: converter.ms_of_day(),
-            unix_time: Default::default(),
+            unix_stamp: Default::default(),
             submillis: converter.submillis(),
         };
         provider.setup(converter.unix_days_seconds(), converter.ms_of_day());
@@ -771,6 +776,7 @@ impl<ProvidesDaysLen: ProvidesDaysLength> CdsTime<ProvidesDaysLen> {
     }
 
     #[cfg(feature = "std")]
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
     pub fn update_from_now(&mut self) -> Result<(), StdTimestampError> {
         let conversion_from_now = self.generic_conversion_from_now()?;
         let ccsds_days: ProvidesDaysLen::FieldType = conversion_from_now
@@ -806,19 +812,22 @@ impl CdsTime<DaysLen24Bits> {
 
     /// Generate a time stamp from the current time using the system clock.
     #[cfg(feature = "std")]
-    pub fn now_with_u24_days() -> Result<Self, StdTimestampError> {
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
-        Self::now_generic(LengthOfDaySegment::Long24Bits)
+    pub fn from_now_with_u24_days() -> Result<Self, StdTimestampError> {
+        Self::from_now_generic(LengthOfDaySegment::Long24Bits)
     }
 
-    /// Create a provider from a [`chrono::DateTime<chrono::Utc>`] struct.
+    /// Create a provider from a [`DateTime<Utc>`] struct.
     ///
     /// ## Errors
     ///
-    /// This function will return [CdsError::DateBeforeCcsdsEpoch] if the time is before the CCSDS
+    /// This function will return [TimestampError::DateBeforeCcsdsEpoch] or
-    /// epoch (1958-01-01T00:00:00+00:00) or the CCSDS days value exceeds the allowed bit width
+    /// [TimestampError::Cds] if the time is before the CCSDS epoch (1958-01-01T00:00:00+00:00)
-    /// (24 bits).
+    /// or the CCSDS days value exceeds the allowed bit width (24 bits).
     #[cfg(feature = "chrono")]
-    pub fn from_dt_with_u24_days(dt: &chrono::DateTime<chrono::Utc>) -> Result<Self, CdsError> {
+    pub fn from_dt_with_u24_days(
+        dt: &chrono::DateTime<chrono::Utc>,
+    ) -> Result<Self, TimestampError> {
         Self::from_dt_generic(dt, LengthOfDaySegment::Long24Bits)
     }
 
@@ -826,13 +835,13 @@ impl CdsTime<DaysLen24Bits> {
     ///
     /// ## Errors
     ///
-    /// This function will return [CdsError::DateBeforeCcsdsEpoch] if the time is before the CCSDS
+    /// This function will return [TimestampError::DateBeforeCcsdsEpoch] or
-    /// epoch (1958-01-01T00:00:00+00:00) or the CCSDS days value exceeds the allowed bit width
+    /// [TimestampError::Cds] if the time is before the CCSDS epoch (1958-01-01T00:00:00+00:00)
-    /// (24 bits).
+    /// or the CCSDS days value exceeds the allowed bit width (24 bits).
-    pub fn from_unix_time_with_u24_day(
+    pub fn from_unix_stamp_with_u24_days(
         unix_stamp: &UnixTime,
         submillis_prec: SubmillisPrecision,
-    ) -> Result<Self, CdsError> {
+    ) -> Result<Self, TimestampError> {
         Self::from_unix_generic(unix_stamp, LengthOfDaySegment::Long24Bits, submillis_prec)
     }
 
@@ -840,7 +849,7 @@ impl CdsTime<DaysLen24Bits> {
     #[cfg(feature = "chrono")]
     pub fn from_dt_with_u24_days_us_precision(
         dt: &chrono::DateTime<chrono::Utc>,
-    ) -> Result<Self, CdsError> {
+    ) -> Result<Self, TimestampError> {
         Self::from_dt_generic_us_prec(dt, LengthOfDaySegment::Long24Bits)
     }
 
@@ -848,20 +857,22 @@ impl CdsTime<DaysLen24Bits> {
     #[cfg(feature = "chrono")]
     pub fn from_dt_with_u24_days_ps_precision(
         dt: &chrono::DateTime<chrono::Utc>,
-    ) -> Result<Self, CdsError> {
+    ) -> Result<Self, TimestampError> {
         Self::from_dt_generic_ps_prec(dt, LengthOfDaySegment::Long24Bits)
     }
 
-    /// Like [Self::now_with_u24_days] but with microsecond sub-millisecond precision.
+    /// Like [Self::from_now_with_u24_days] but with microsecond sub-millisecond precision.
     #[cfg(feature = "std")]
-    pub fn now_with_u24_days_us_precision() -> Result<Self, StdTimestampError> {
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
-        Self::now_generic_with_us_prec(LengthOfDaySegment::Long24Bits)
+    pub fn from_now_with_u24_days_us_precision() -> Result<Self, StdTimestampError> {
+        Self::from_now_generic_us_prec(LengthOfDaySegment::Long24Bits)
     }
 
-    /// Like [Self::now_with_u24_days] but with picoseconds sub-millisecond precision.
+    /// Like [Self::from_now_with_u24_days] but with picoseconds sub-millisecond precision.
     #[cfg(feature = "std")]
-    pub fn now_with_u24_days_ps_precision() -> Result<Self, StdTimestampError> {
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
-        Self::now_generic_with_us_prec(LengthOfDaySegment::Long24Bits)
+    pub fn from_now_with_u24_days_ps_precision() -> Result<Self, StdTimestampError> {
+        Self::from_now_generic_us_prec(LengthOfDaySegment::Long24Bits)
     }
 
     pub fn from_bytes_with_u24_days(buf: &[u8]) -> Result<Self, TimestampError> {
@@ -898,33 +909,36 @@ impl CdsTime<DaysLen16Bits> {
         Self::generic_new(LengthOfDaySegment::Short16Bits, ccsds_days, ms_of_day).unwrap()
     }
 
-    /// Create a provider from a [`chrono::DateTime<Utc>`] struct.
+    /// Create a provider from a [`DateTime<Utc>`] struct.
     ///
-    /// This function will return a [CdsError::DateBeforeCcsdsEpoch] if the time is before the
+    /// This function will return a [TimestampError::DateBeforeCcsdsEpoch] or a
-    /// CCSDS epoch (01-01-1958 00:00:00) or the CCSDS days value exceeds the allowed bit width
+    /// [TimestampError::Cds] if the time is before the CCSDS epoch (01-01-1958 00:00:00) or
-    /// (16 bits).
+    /// the CCSDS days value exceeds the allowed bit width (16 bits).
     #[cfg(feature = "chrono")]
-    pub fn from_dt_with_u16_days(dt: &chrono::DateTime<chrono::Utc>) -> Result<Self, CdsError> {
+    pub fn from_dt_with_u16_days(
+        dt: &chrono::DateTime<chrono::Utc>,
+    ) -> Result<Self, TimestampError> {
         Self::from_dt_generic(dt, LengthOfDaySegment::Short16Bits)
     }
 
     /// Generate a time stamp from the current time using the system clock.
     #[cfg(feature = "std")]
-    pub fn now_with_u16_days() -> Result<Self, StdTimestampError> {
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
-        Self::now_generic(LengthOfDaySegment::Short16Bits)
+    pub fn from_now_with_u16_days() -> Result<Self, StdTimestampError> {
+        Self::from_now_generic(LengthOfDaySegment::Short16Bits)
     }
 
     /// Create a provider from a generic UNIX timestamp (seconds since 1970-01-01T00:00:00+00:00).
     ///
     /// ## Errors
     ///
-    /// This function will return [CdsError::DateBeforeCcsdsEpoch] if the time is before the CCSDS
+    /// This function will return [TimestampError::DateBeforeCcsdsEpoch] or
-    /// epoch (1958-01-01T00:00:00+00:00) or the CCSDS days value exceeds the allowed bit width
+    /// [TimestampError::Cds] if the time is before the CCSDS epoch (1958-01-01T00:00:00+00:00)
-    /// (24 bits).
+    /// or the CCSDS days value exceeds the allowed bit width (24 bits).
-    pub fn from_unix_time_with_u16_days(
+    pub fn from_unix_stamp_with_u16_days(
         unix_stamp: &UnixTime,
         submillis_prec: SubmillisPrecision,
-    ) -> Result<Self, CdsError> {
+    ) -> Result<Self, TimestampError> {
         Self::from_unix_generic(unix_stamp, LengthOfDaySegment::Short16Bits, submillis_prec)
     }
 
@@ -932,7 +946,7 @@ impl CdsTime<DaysLen16Bits> {
     #[cfg(feature = "chrono")]
     pub fn from_dt_with_u16_days_us_precision(
         dt: &chrono::DateTime<chrono::Utc>,
-    ) -> Result<Self, CdsError> {
+    ) -> Result<Self, TimestampError> {
         Self::from_dt_generic_us_prec(dt, LengthOfDaySegment::Short16Bits)
     }
 
@@ -940,18 +954,20 @@ impl CdsTime<DaysLen16Bits> {
     #[cfg(feature = "chrono")]
     pub fn from_dt_with_u16_days_ps_precision(
         dt: &chrono::DateTime<chrono::Utc>,
-    ) -> Result<Self, CdsError> {
+    ) -> Result<Self, TimestampError> {
         Self::from_dt_generic_ps_prec(dt, LengthOfDaySegment::Short16Bits)
     }
 
-    /// Like [Self::now_with_u16_days] but with microsecond sub-millisecond precision.
+    /// Like [Self::from_now_with_u16_days] but with microsecond sub-millisecond precision.
     #[cfg(feature = "std")]
-    pub fn now_with_u16_days_us_precision() -> Result<Self, StdTimestampError> {
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
-        Self::now_generic_with_us_prec(LengthOfDaySegment::Short16Bits)
+    pub fn from_now_with_u16_days_us_precision() -> Result<Self, StdTimestampError> {
+        Self::from_now_generic_us_prec(LengthOfDaySegment::Short16Bits)
     }
 
-    /// Like [Self::now_with_u16_days] but with picosecond sub-millisecond precision.
+    /// Like [Self::from_now_with_u16_days] but with picosecond sub-millisecond precision.
     #[cfg(feature = "std")]
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
     pub fn from_now_with_u16_days_ps_precision() -> Result<Self, StdTimestampError> {
         Self::from_now_generic_ps_prec(LengthOfDaySegment::Short16Bits)
     }
@@ -1152,7 +1168,7 @@ impl AddAssign<Duration> for CdsTime<DaysLen24Bits> {
 
 #[cfg(feature = "chrono")]
 impl TryFrom<chrono::DateTime<chrono::Utc>> for CdsTime<DaysLen16Bits> {
-    type Error = CdsError;
+    type Error = TimestampError;
 
     fn try_from(dt: chrono::DateTime<chrono::Utc>) -> Result<Self, Self::Error> {
         let conversion = ConversionFromChronoDatetime::new(&dt)?;
@@ -1162,7 +1178,8 @@ impl TryFrom<chrono::DateTime<chrono::Utc>> for CdsTime<DaysLen16Bits> {
 
 #[cfg(feature = "chrono")]
 impl TryFrom<chrono::DateTime<chrono::Utc>> for CdsTime<DaysLen24Bits> {
-    type Error = CdsError;
+    type Error = TimestampError;
+
     fn try_from(dt: chrono::DateTime<chrono::Utc>) -> Result<Self, Self::Error> {
         let conversion = ConversionFromChronoDatetime::new(&dt)?;
         Self::generic_from_conversion(LengthOfDaySegment::Long24Bits, conversion)
@@ -1184,16 +1201,16 @@ impl<ProvidesDaysLen: ProvidesDaysLength> CcsdsTimeProvider for CdsTime<Provides
 
     #[inline]
     fn unix_secs(&self) -> i64 {
-        self.unix_time.secs
+        self.unix_stamp.secs
     }
     #[inline]
     fn subsec_nanos(&self) -> u32 {
-        self.unix_time.subsec_nanos
+        self.unix_stamp.subsec_nanos
     }
 
     #[inline]
-    fn unix_time(&self) -> UnixTime {
+    fn unix_stamp(&self) -> UnixTime {
-        self.unix_time
+        self.unix_stamp
     }
 }
 
@@ -1340,7 +1357,7 @@ mod tests {
     #[test]
     fn test_time_stamp_zero_args() {
         let time_stamper = CdsTime::new_with_u16_days(0, 0);
-        let unix_stamp = time_stamper.unix_time();
+        let unix_stamp = time_stamper.unix_stamp();
         assert_eq!(
             unix_stamp.secs,
             (DAYS_CCSDS_TO_UNIX * SECONDS_PER_DAY as i32) as i64
@@ -1369,7 +1386,7 @@ mod tests {
     #[test]
     fn test_time_stamp_unix_epoch() {
         let time_stamper = CdsTime::new_with_u16_days((-DAYS_CCSDS_TO_UNIX) as u16, 0);
-        assert_eq!(time_stamper.unix_time().secs, 0);
+        assert_eq!(time_stamper.unix_stamp().secs, 0);
         assert_eq!(
             time_stamper.submillis_precision(),
             SubmillisPrecision::Absent
@@ -1446,7 +1463,7 @@ mod tests {
     fn test_write() {
         let mut buf = [0; 16];
         let time_stamper_0 = CdsTime::new_with_u16_days(0, 0);
-        let unix_stamp = time_stamper_0.unix_time();
+        let unix_stamp = time_stamper_0.unix_stamp();
         assert_eq!(
             unix_stamp.secs,
             (DAYS_CCSDS_TO_UNIX * SECONDS_PER_DAY as i32).into()
@@ -1591,23 +1608,20 @@ mod tests {
     }
 
     #[test]
-    #[cfg_attr(miri, ignore)]
     fn test_time_now() {
-        let timestamp_now = CdsTime::now_with_u16_days().unwrap();
+        let timestamp_now = CdsTime::from_now_with_u16_days().unwrap();
         let compare_stamp = chrono::Utc::now();
         generic_now_test(timestamp_now, compare_stamp);
     }
 
     #[test]
-    #[cfg_attr(miri, ignore)]
     fn test_time_now_us_prec() {
-        let timestamp_now = CdsTime::now_with_u16_days_us_precision().unwrap();
+        let timestamp_now = CdsTime::from_now_with_u16_days_us_precision().unwrap();
         let compare_stamp = chrono::Utc::now();
         generic_now_test(timestamp_now, compare_stamp);
     }
 
     #[test]
-    #[cfg_attr(miri, ignore)]
     fn test_time_now_ps_prec() {
         let timestamp_now = CdsTime::from_now_with_u16_days_ps_precision().unwrap();
         let compare_stamp = chrono::Utc::now();
@@ -1615,7 +1629,6 @@ mod tests {
     }
 
     #[test]
-    #[cfg_attr(miri, ignore)]
     fn test_time_now_ps_prec_u16_days() {
         let timestamp_now = CdsTime::from_now_with_u16_days_ps_precision().unwrap();
         let compare_stamp = chrono::Utc::now();
@@ -1623,9 +1636,8 @@ mod tests {
     }
 
     #[test]
-    #[cfg_attr(miri, ignore)]
     fn test_time_now_ps_prec_u24_days() {
-        let timestamp_now = CdsTime::now_with_u24_days_ps_precision().unwrap();
+        let timestamp_now = CdsTime::from_now_with_u24_days_ps_precision().unwrap();
         let compare_stamp = chrono::Utc::now();
         generic_now_test(timestamp_now, compare_stamp);
     }
@@ -1910,7 +1922,7 @@ mod tests {
     fn test_creation_from_unix_stamp_0_u16_days() {
         let unix_secs = 0;
         let subsec_millis = 0;
-        let time_provider = CdsTime::from_unix_time_with_u16_days(
+        let time_provider = CdsTime::from_unix_stamp_with_u16_days(
             &UnixTime::new(unix_secs, subsec_millis),
             SubmillisPrecision::Absent,
         )
@@ -1922,7 +1934,7 @@ mod tests {
     fn test_creation_from_unix_stamp_0_u24_days() {
         let unix_secs = 0;
         let subsec_millis = 0;
-        let time_provider = CdsTime::from_unix_time_with_u24_day(
+        let time_provider = CdsTime::from_unix_stamp_with_u24_days(
             &UnixTime::new(unix_secs, subsec_millis),
             SubmillisPrecision::Absent,
         )
@@ -1939,8 +1951,10 @@ mod tests {
             .unwrap()
             .and_local_timezone(chrono::Utc)
             .unwrap();
-        let time_provider =
+        let time_provider = CdsTime::from_unix_stamp_with_u16_days(
-            CdsTime::from_unix_time_with_u16_days(&datetime_utc.into(), SubmillisPrecision::Absent)
+            &datetime_utc.into(),
+            SubmillisPrecision::Absent,
+        )
         .expect("creating provider from unix stamp failed");
         // https://www.timeanddate.com/date/durationresult.html?d1=01&m1=01&y1=1958&d2=14&m2=01&y2=2023
         // Leap years need to be accounted for as well.
@@ -1957,7 +1971,7 @@ mod tests {
     fn test_creation_0_ccsds_days() {
         let unix_secs = DAYS_CCSDS_TO_UNIX as i64 * SECONDS_PER_DAY as i64;
         let subsec_millis = 0;
-        let time_provider = CdsTime::from_unix_time_with_u16_days(
+        let time_provider = CdsTime::from_unix_stamp_with_u16_days(
             &UnixTime::new(unix_secs, subsec_millis),
             SubmillisPrecision::Absent,
         )
@@ -1969,7 +1983,7 @@ mod tests {
     fn test_invalid_creation_from_unix_stamp_days_too_large() {
         let invalid_unix_secs: i64 = (u16::MAX as i64 + 1) * SECONDS_PER_DAY as i64;
         let subsec_millis = 0;
-        match CdsTime::from_unix_time_with_u16_days(
+        match CdsTime::from_unix_stamp_with_u16_days(
             &UnixTime::new(invalid_unix_secs, subsec_millis),
             SubmillisPrecision::Absent,
         ) {
@@ -1977,12 +1991,12 @@ mod tests {
                 panic!("creation should not succeed")
             }
             Err(e) => {
-                if let CdsError::InvalidCcsdsDays(days) = e {
+                if let TimestampError::Cds(CdsError::InvalidCcsdsDays(days)) = e {
                     assert_eq!(
                         days,
                         unix_to_ccsds_days(invalid_unix_secs / SECONDS_PER_DAY as i64)
                     );
-                    assert_eq!(e.to_string(), "invalid ccsds days 69919");
+                    assert_eq!(e.to_string(), "cds error: invalid ccsds days 69919");
                 } else {
                     panic!("unexpected error {}", e)
                 }
@@ -1996,7 +2010,7 @@ mod tests {
         // precisely 31-12-1957 23:59:55
         let unix_secs = DAYS_CCSDS_TO_UNIX * SECONDS_PER_DAY as i32 - 5;
         let subsec_millis = 0;
-        match CdsTime::from_unix_time_with_u16_days(
+        match CdsTime::from_unix_stamp_with_u16_days(
             &UnixTime::new(unix_secs as i64, subsec_millis),
             SubmillisPrecision::Absent,
         ) {
@@ -2004,8 +2018,8 @@ mod tests {
                 panic!("creation should not succeed")
             }
             Err(e) => {
-                if let CdsError::DateBeforeCcsdsEpoch(DateBeforeCcsdsEpochError(unix_dt)) = e {
+                if let TimestampError::DateBeforeCcsdsEpoch(dt) = e {
-                    let dt = unix_dt.chrono_date_time();
+                    let dt = dt.chrono_date_time();
                     if let chrono::LocalResult::Single(dt) = dt {
                         assert_eq!(dt.year(), 1957);
                         assert_eq!(dt.month(), 12);
@@ -2235,9 +2249,7 @@ mod tests {
             .unwrap();
         let time_provider = CdsTime::from_dt_with_u24_days(&datetime_utc);
         assert!(time_provider.is_err());
-        if let CdsError::DateBeforeCcsdsEpoch(DateBeforeCcsdsEpochError(dt)) =
+        if let TimestampError::DateBeforeCcsdsEpoch(dt) = time_provider.unwrap_err() {
-            time_provider.unwrap_err()
-        {
             assert_eq!(dt, datetime_utc.into());
         }
     }
@@ -2280,11 +2292,10 @@ mod tests {
     }
 
     #[test]
-    #[cfg_attr(miri, ignore)]
     fn test_update_from_now() {
         let mut stamp = CdsTime::new_with_u16_days(0, 0);
         let _ = stamp.update_from_now();
-        let dt = stamp.unix_time().chrono_date_time().unwrap();
+        let dt = stamp.unix_stamp().chrono_date_time().unwrap();
         assert!(dt.year() > 2020);
     }
 
@@ -2296,9 +2307,8 @@ mod tests {
 
     #[test]
     #[cfg(feature = "serde")]
-    #[cfg_attr(miri, ignore)]
     fn test_serialization() {
-        let stamp_now = CdsTime::now_with_u16_days().expect("Error retrieving time");
+        let stamp_now = CdsTime::from_now_with_u16_days().expect("Error retrieving time");
         let val = to_allocvec(&stamp_now).expect("Serializing timestamp failed");
         assert!(val.len() > 0);
         let stamp_deser: CdsTime = from_bytes(&val).expect("Stamp deserialization failed");

src/time/mod.rs

@@ -1,11 +1,12 @@
 //! CCSDS Time Code Formats according to [CCSDS 301.0-B-4](https://public.ccsds.org/Pubs/301x0b4e1.pdf)
 use crate::ByteConversionError;
 #[cfg(feature = "chrono")]
-use chrono::{TimeZone, Utc};
+use chrono::{DateTime, LocalResult, TimeZone, Utc};
 use core::cmp::Ordering;
 use core::fmt::{Display, Formatter};
 use core::ops::{Add, AddAssign, Sub};
 use core::time::Duration;
+use core::u8;
 
 #[allow(unused_imports)]
 #[cfg(not(feature = "std"))]
@@ -32,7 +33,6 @@ pub const NANOS_PER_SECOND: u32 = 1_000_000_000;
 
 #[derive(Debug, PartialEq, Eq, Copy, Clone)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum CcsdsTimeCode {
     CucCcsdsEpoch = 0b001,
     CucAgencyEpoch = 0b010,
@@ -63,21 +63,15 @@ pub fn ccsds_time_code_from_p_field(pfield: u8) -> Result<CcsdsTimeCode, u8> {
     CcsdsTimeCode::try_from(raw_bits).map_err(|_| raw_bits)
 }
 
-#[derive(Debug, PartialEq, Eq, Copy, Clone, thiserror::Error)]
-#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
-#[error("date before ccsds epoch: {0:?}")]
-pub struct DateBeforeCcsdsEpochError(UnixTime);
-
 #[derive(Debug, PartialEq, Eq, Copy, Clone)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[non_exhaustive]
 pub enum TimestampError {
     InvalidTimeCode { expected: CcsdsTimeCode, found: u8 },
     ByteConversion(ByteConversionError),
     Cds(cds::CdsError),
     Cuc(cuc::CucError),
+    DateBeforeCcsdsEpoch(UnixTime),
     CustomEpochNotSupported,
 }
 
@@ -99,6 +93,9 @@ impl Display for TimestampError {
             TimestampError::ByteConversion(e) => {
                 write!(f, "time stamp: {e}")
             }
+            TimestampError::DateBeforeCcsdsEpoch(e) => {
+                write!(f, "datetime with date before ccsds epoch: {e:?}")
+            }
             TimestampError::CustomEpochNotSupported => {
                 write!(f, "custom epochs are not supported")
             }
@@ -117,7 +114,6 @@ impl Error for TimestampError {
         }
     }
 }
-
 impl From<cds::CdsError> for TimestampError {
     fn from(e: cds::CdsError) -> Self {
         TimestampError::Cds(e)
@@ -131,6 +127,7 @@ impl From<cuc::CucError> for TimestampError {
 }
 
 #[cfg(feature = "std")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
 pub mod std_mod {
     use crate::time::TimestampError;
     use std::time::SystemTimeError;
@@ -138,7 +135,7 @@ pub mod std_mod {
 
     #[derive(Debug, Clone, Error)]
     pub enum StdTimestampError {
-        #[error("system time error: {0:?}")]
+        #[error("system time error: {0}")]
         SystemTime(#[from] SystemTimeError),
         #[error("timestamp error: {0}")]
         Timestamp(#[from] TimestampError),
@@ -146,6 +143,7 @@ pub mod std_mod {
 }
 
 #[cfg(feature = "std")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
 pub fn seconds_since_epoch() -> f64 {
     SystemTime::now()
         .duration_since(SystemTime::UNIX_EPOCH)
@@ -157,7 +155,6 @@ pub fn seconds_since_epoch() -> f64 {
 ///
 ///  - CCSDS epoch: 1958-01-01T00:00:00+00:00
 ///  - UNIX Epoch: 1970-01-01T00:00:00+00:00
-#[inline]
 pub const fn unix_to_ccsds_days(unix_days: i64) -> i64 {
     unix_days - DAYS_CCSDS_TO_UNIX as i64
 }
@@ -166,24 +163,22 @@ pub const fn unix_to_ccsds_days(unix_days: i64) -> i64 {
 ///
 ///  - CCSDS epoch: 1958-01-01T00:00:00+00:00
 ///  - UNIX Epoch: 1970-01-01T00:00:00+00:00
-#[inline]
 pub const fn ccsds_to_unix_days(ccsds_days: i64) -> i64 {
     ccsds_days + DAYS_CCSDS_TO_UNIX as i64
 }
 
 /// Similar to [unix_to_ccsds_days] but converts the epoch instead, which is the number of elpased
 /// seconds since the CCSDS and UNIX epoch times.
-#[inline]
 pub const fn unix_epoch_to_ccsds_epoch(unix_epoch: i64) -> i64 {
     unix_epoch - (DAYS_CCSDS_TO_UNIX as i64 * SECONDS_PER_DAY as i64)
 }
 
-#[inline]
 pub const fn ccsds_epoch_to_unix_epoch(ccsds_epoch: i64) -> i64 {
     ccsds_epoch + (DAYS_CCSDS_TO_UNIX as i64 * SECONDS_PER_DAY as i64)
 }
 
 #[cfg(feature = "std")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
 pub fn ms_of_day_using_sysclock() -> u32 {
     ms_of_day(seconds_since_epoch())
 }
@@ -204,6 +199,7 @@ pub trait TimeWriter {
     fn write_to_bytes(&self, bytes: &mut [u8]) -> Result<usize, TimestampError>;
 
     #[cfg(feature = "alloc")]
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "alloc")))]
     fn to_vec(&self) -> Result<alloc::vec::Vec<u8>, TimestampError> {
         let mut vec = alloc::vec![0; self.len_written()];
         self.write_to_bytes(&mut vec)?;
@@ -237,16 +233,18 @@ pub trait CcsdsTimeProvider {
         (self.subsec_nanos() / 1_000_000) as u16
     }
 
-    fn unix_time(&self) -> UnixTime {
+    fn unix_stamp(&self) -> UnixTime {
         UnixTime::new(self.unix_secs(), self.subsec_nanos())
     }
 
     #[cfg(feature = "chrono")]
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "chrono")))]
     fn chrono_date_time(&self) -> chrono::LocalResult<chrono::DateTime<chrono::Utc>> {
         chrono::Utc.timestamp_opt(self.unix_secs(), self.subsec_nanos())
     }
 
     #[cfg(feature = "timelib")]
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "timelib")))]
     fn timelib_date_time(&self) -> Result<time::OffsetDateTime, time::error::ComponentRange> {
         Ok(time::OffsetDateTime::from_unix_timestamp(self.unix_secs())?
             + time::Duration::nanoseconds(self.subsec_nanos().into()))
@@ -260,7 +258,6 @@ pub trait CcsdsTimeProvider {
 /// similarly to other common time formats and libraries.
 #[derive(Default, Debug, Copy, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct UnixTime {
     secs: i64,
     subsec_nanos: u32,
@@ -304,7 +301,7 @@ impl UnixTime {
     }
 
     /// This function will panic if the subsecond value is larger than the fraction of a second.
-    /// Use [Self::new_checked] if you want to handle this case without a panic.
+    /// Use [new_checked] if you want to handle this case without a panic.
     pub const fn new(unix_seconds: i64, subsecond_nanos: u32) -> Self {
         if subsecond_nanos >= NANOS_PER_SECOND {
             panic!("invalid subsecond nanos value");
@@ -316,7 +313,7 @@ impl UnixTime {
     }
 
     /// This function will panic if the subsecond value is larger than the fraction of a second.
-    /// Use [Self::new_subsec_millis_checked] if you want to handle this case without a panic.
+    /// Use [new_subsecond_millis_checked] if you want to handle this case without a panic.
     pub const fn new_subsec_millis(unix_seconds: i64, subsecond_millis: u16) -> Self {
         if subsecond_millis >= 1000 {
             panic!("invalid subsecond millisecond value");
@@ -344,7 +341,8 @@ impl UnixTime {
     }
 
     #[cfg(feature = "std")]
-    pub fn now() -> Result<Self, SystemTimeError> {
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
+    pub fn from_now() -> Result<Self, SystemTimeError> {
         let now = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH)?;
         let epoch = now.as_secs();
         Ok(Self::new(epoch as i64, now.subsec_nanos()))
@@ -355,49 +353,43 @@ impl UnixTime {
         self.secs as f64 + (self.subsec_nanos as f64 / 1_000_000_000.0)
     }
 
-    pub fn as_secs(&self) -> i64 {
+    pub fn secs(&self) -> i64 {
         self.secs
     }
 
     #[cfg(feature = "chrono")]
-    pub fn chrono_date_time(&self) -> chrono::LocalResult<chrono::DateTime<chrono::Utc>> {
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "chrono")))]
+    pub fn chrono_date_time(&self) -> LocalResult<DateTime<Utc>> {
         Utc.timestamp_opt(self.secs, self.subsec_nanos)
     }
 
     #[cfg(feature = "timelib")]
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "timelib")))]
     pub fn timelib_date_time(&self) -> Result<time::OffsetDateTime, time::error::ComponentRange> {
-        Ok(time::OffsetDateTime::from_unix_timestamp(self.as_secs())?
+        Ok(time::OffsetDateTime::from_unix_timestamp(self.secs())?
             + time::Duration::nanoseconds(self.subsec_nanos().into()))
     }
 
     // Calculate the difference in milliseconds between two UnixTimestamps
-    pub fn diff_in_millis(&self, other: &UnixTime) -> Option<i64> {
+    pub fn diff_in_millis(&self, other: &UnixTime) -> i64 {
-        let seconds_difference = self.secs.checked_sub(other.secs)?;
+        let seconds_difference = self.secs - other.secs;
         // Convert seconds difference to milliseconds
-        let milliseconds_difference = seconds_difference.checked_mul(1000)?;
+        let milliseconds_difference = seconds_difference * 1000;
 
         // Calculate the difference in subsecond milliseconds directly
         let subsecond_difference_nanos = self.subsec_nanos as i64 - other.subsec_nanos as i64;
 
         // Combine the differences
-        Some(milliseconds_difference + (subsecond_difference_nanos / 1_000_000))
+        milliseconds_difference + (subsecond_difference_nanos / 1_000_000)
     }
 }
 
-#[cfg(feature = "chrono")]
+impl From<DateTime<Utc>> for UnixTime {
-impl From<chrono::DateTime<chrono::Utc>> for UnixTime {
+    fn from(value: DateTime<Utc>) -> Self {
-    fn from(value: chrono::DateTime<chrono::Utc>) -> Self {
         Self::new(value.timestamp(), value.timestamp_subsec_nanos())
     }
 }
 
-#[cfg(feature = "timelib")]
-impl From<time::OffsetDateTime> for UnixTime {
-    fn from(value: time::OffsetDateTime) -> Self {
-        Self::new(value.unix_timestamp(), value.nanosecond())
-    }
-}
-
 impl PartialOrd for UnixTime {
     fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
         Some(self.cmp(other))
@@ -445,11 +437,11 @@ pub struct StampDiff {
 }
 
 impl Sub for UnixTime {
-    type Output = Option<StampDiff>;
+    type Output = StampDiff;
 
     fn sub(self, rhs: Self) -> Self::Output {
-        let difference = self.diff_in_millis(&rhs)?;
+        let difference = self.diff_in_millis(&rhs);
-        Some(if difference < 0 {
+        if difference < 0 {
             StampDiff {
                 positive_duration: false,
                 duration_absolute: Duration::from_millis(-difference as u64),
@@ -459,7 +451,7 @@ impl Sub for UnixTime {
                 positive_duration: true,
                 duration_absolute: Duration::from_millis(difference as u64),
             }
-        })
+        }
     }
 }
 
@@ -542,7 +534,6 @@ mod tests {
     }
 
     #[test]
-    #[cfg_attr(miri, ignore)]
     fn test_get_current_time() {
         let sec_floats = seconds_since_epoch();
         assert!(sec_floats > 0.0);
@@ -557,7 +548,6 @@ mod tests {
     }
 
     #[test]
-    #[cfg_attr(miri, ignore)]
     fn test_ccsds_epoch() {
         let now = SystemTime::now()
             .duration_since(SystemTime::UNIX_EPOCH)
@@ -650,7 +640,7 @@ mod tests {
     fn test_addition() {
         let mut stamp0 = UnixTime::new_only_secs(1);
         stamp0 += Duration::from_secs(5);
-        assert_eq!(stamp0.as_secs(), 6);
+        assert_eq!(stamp0.secs(), 6);
         assert_eq!(stamp0.subsec_millis(), 0);
         let stamp1 = stamp0 + Duration::from_millis(500);
         assert_eq!(stamp1.secs, 6);
@@ -678,9 +668,8 @@ mod tests {
     }
 
     #[test]
-    #[cfg_attr(miri, ignore)]
     fn test_from_now() {
-        let stamp_now = UnixTime::now().unwrap();
+        let stamp_now = UnixTime::from_now().unwrap();
         let dt_now = stamp_now.chrono_date_time().unwrap();
         assert!(dt_now.year() >= 2020);
     }
@@ -691,7 +680,7 @@ mod tests {
         let StampDiff {
             positive_duration,
             duration_absolute,
-        } = (stamp_later - UnixTime::new(1, 0)).expect("stamp diff error");
+        } = stamp_later - UnixTime::new(1, 0);
         assert!(positive_duration);
         assert_eq!(duration_absolute, Duration::from_secs(1));
     }
@@ -703,7 +692,7 @@ mod tests {
         let StampDiff {
             positive_duration,
             duration_absolute,
-        } = (stamp_later - stamp_earlier).expect("stamp diff error");
+        } = stamp_later - stamp_earlier;
         assert!(positive_duration);
         assert_eq!(duration_absolute, Duration::from_millis(1900));
     }
@@ -715,7 +704,7 @@ mod tests {
         let StampDiff {
             positive_duration,
             duration_absolute,
-        } = (stamp_earlier - stamp_later).expect("stamp diff error");
+        } = stamp_earlier - stamp_later;
         assert!(!positive_duration);
         assert_eq!(duration_absolute, Duration::from_millis(1900));
     }
@@ -750,13 +739,4 @@ mod tests {
         assert_eq!(timelib_dt.minute(), 0);
         assert_eq!(timelib_dt.second(), 0);
     }
-
-    #[test]
-    #[cfg(feature = "timelib")]
-    fn test_unix_stamp_from_timelib_datetime() {
-        let timelib_dt = time::OffsetDateTime::UNIX_EPOCH;
-        let unix_time = UnixTime::from(timelib_dt);
-        let timelib_converted_back = unix_time.timelib_date_time().unwrap();
-        assert_eq!(timelib_dt, timelib_converted_back);
-    }
 }

src/util.rs

@@ -15,12 +15,10 @@ pub trait ToBeBytes {
 impl ToBeBytes for () {
     type ByteArray = [u8; 0];
 
-    #[inline]
     fn written_len(&self) -> usize {
         0
     }
 
-    #[inline]
     fn to_be_bytes(&self) -> Self::ByteArray {
         []
     }
@@ -29,12 +27,9 @@ impl ToBeBytes for () {
 impl ToBeBytes for u8 {
     type ByteArray = [u8; 1];
 
-    #[inline]
     fn written_len(&self) -> usize {
         1
     }
-
-    #[inline]
     fn to_be_bytes(&self) -> Self::ByteArray {
         u8::to_be_bytes(*self)
     }
@@ -43,12 +38,9 @@ impl ToBeBytes for u8 {
 impl ToBeBytes for u16 {
     type ByteArray = [u8; 2];
 
-    #[inline]
     fn written_len(&self) -> usize {
         2
     }
-
-    #[inline]
     fn to_be_bytes(&self) -> Self::ByteArray {
         u16::to_be_bytes(*self)
     }
@@ -57,12 +49,9 @@ impl ToBeBytes for u16 {
 impl ToBeBytes for u32 {
     type ByteArray = [u8; 4];
 
-    #[inline]
     fn written_len(&self) -> usize {
         4
     }
-
-    #[inline]
     fn to_be_bytes(&self) -> Self::ByteArray {
         u32::to_be_bytes(*self)
     }
@@ -71,12 +60,9 @@ impl ToBeBytes for u32 {
 impl ToBeBytes for u64 {
     type ByteArray = [u8; 8];
 
-    #[inline]
     fn written_len(&self) -> usize {
         8
     }
-
-    #[inline]
     fn to_be_bytes(&self) -> Self::ByteArray {
         u64::to_be_bytes(*self)
     }
@@ -91,6 +77,7 @@ pub trait UnsignedEnum {
     fn value(&self) -> u64;
 
     #[cfg(feature = "alloc")]
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "alloc")))]
     fn to_vec(&self) -> alloc::vec::Vec<u8> {
         let mut buf = alloc::vec![0; self.size()];
         self.write_to_be_bytes(&mut buf).unwrap();
@@ -118,7 +105,6 @@ pub enum UnsignedByteFieldError {
 }
 
 impl From<ByteConversionError> for UnsignedByteFieldError {
-    #[inline]
     fn from(value: ByteConversionError) -> Self {
         Self::ByteConversionError(value)
     }
@@ -146,24 +132,20 @@ impl Error for UnsignedByteFieldError {}
 /// Type erased variant.
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct UnsignedByteField {
     width: usize,
     value: u64,
 }
 
 impl UnsignedByteField {
-    #[inline]
     pub const fn new(width: usize, value: u64) -> Self {
         Self { width, value }
     }
 
-    #[inline]
     pub const fn value_const(&self) -> u64 {
         self.value
     }
 
-    #[inline]
     pub fn new_from_be_bytes(width: usize, buf: &[u8]) -> Result<Self, UnsignedByteFieldError> {
         if width > buf.len() {
             return Err(ByteConversionError::FromSliceTooSmall {
@@ -196,12 +178,10 @@ impl UnsignedByteField {
 }
 
 impl UnsignedEnum for UnsignedByteField {
-    #[inline]
     fn size(&self) -> usize {
         self.width
     }
 
-    #[inline]
     fn value(&self) -> u64 {
         self.value_const()
     }
@@ -241,7 +221,6 @@ impl UnsignedEnum for UnsignedByteField {
 
 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct GenericUnsignedByteField<TYPE: Copy + Into<u64>> {
     value: TYPE,
 }
@@ -257,7 +236,6 @@ impl<TYPE: Copy + Into<u64>> GenericUnsignedByteField<TYPE> {
 }
 
 impl<TYPE: Copy + ToBeBytes + Into<u64>> UnsignedEnum for GenericUnsignedByteField<TYPE> {
-    #[inline]
     fn size(&self) -> usize {
         self.value.written_len()
     }
@@ -273,7 +251,6 @@ impl<TYPE: Copy + ToBeBytes + Into<u64>> UnsignedEnum for GenericUnsignedByteFie
         Ok(self.value.written_len())
     }
 
-    #[inline]
     fn value(&self) -> u64 {
         self.value_typed().into()
     }
@@ -299,7 +276,6 @@ impl From<UnsignedByteFieldU8> for UnsignedByteField {
 impl TryFrom<UnsignedByteField> for UnsignedByteFieldU8 {
     type Error = UnsignedByteFieldError;
 
-    #[inline]
     fn try_from(value: UnsignedByteField) -> Result<Self, Self::Error> {
         if value.width != 1 {
             return Err(UnsignedByteFieldError::InvalidWidth {
@@ -312,7 +288,6 @@ impl TryFrom<UnsignedByteField> for UnsignedByteFieldU8 {
 }
 
 impl From<UnsignedByteFieldU16> for UnsignedByteField {
-    #[inline]
     fn from(value: UnsignedByteFieldU16) -> Self {
         Self::new(2, value.value as u64)
     }
@@ -321,7 +296,6 @@ impl From<UnsignedByteFieldU16> for UnsignedByteField {
 impl TryFrom<UnsignedByteField> for UnsignedByteFieldU16 {
     type Error = UnsignedByteFieldError;
 
-    #[inline]
     fn try_from(value: UnsignedByteField) -> Result<Self, Self::Error> {
         if value.width != 2 {
             return Err(UnsignedByteFieldError::InvalidWidth {
@@ -334,7 +308,6 @@ impl TryFrom<UnsignedByteField> for UnsignedByteFieldU16 {
 }
 
 impl From<UnsignedByteFieldU32> for UnsignedByteField {
-    #[inline]
     fn from(value: UnsignedByteFieldU32) -> Self {
         Self::new(4, value.value as u64)
     }
@@ -343,7 +316,6 @@ impl From<UnsignedByteFieldU32> for UnsignedByteField {
 impl TryFrom<UnsignedByteField> for UnsignedByteFieldU32 {
     type Error = UnsignedByteFieldError;
 
-    #[inline]
     fn try_from(value: UnsignedByteField) -> Result<Self, Self::Error> {
         if value.width != 4 {
             return Err(UnsignedByteFieldError::InvalidWidth {
@@ -356,7 +328,6 @@ impl TryFrom<UnsignedByteField> for UnsignedByteFieldU32 {
 }
 
 impl From<UnsignedByteFieldU64> for UnsignedByteField {
-    #[inline]
     fn from(value: UnsignedByteFieldU64) -> Self {
         Self::new(8, value.value)
     }
@@ -365,7 +336,6 @@ impl From<UnsignedByteFieldU64> for UnsignedByteField {
 impl TryFrom<UnsignedByteField> for UnsignedByteFieldU64 {
     type Error = UnsignedByteFieldError;
 
-    #[inline]
     fn try_from(value: UnsignedByteField) -> Result<Self, Self::Error> {
         if value.width != 8 {
             return Err(UnsignedByteFieldError::InvalidWidth {