.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@1.81.0
+      - uses: dtolnay/rust-toolchain@1.75.0
       - run: cargo check --release
 
   cross-check:

CHANGELOG.md

@@ -7,12 +7,3 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 # [unreleased]
-
-- Bumped `thiserror` to v2
-- Bumped `spacepackets` to v0.13
-- The source and destination handlers can now be used without the `std` feature and only require
-  the `alloc` feature.
-
-# [v0.1.0] 2024-09-11
-
-Initial release

Cargo.toml

@@ -18,49 +18,45 @@ name = "cfdp"
 [dependencies]
 crc = "3"
 smallvec = "1"
-derive-new = ">=0.6, <=0.7"
+derive-new = "0.6"
-
-[dependencies.spacepackets]
-version = "0.13"
-default-features = false
 
 [dependencies.thiserror]
-version = "2"
+version = "1"
-default-features = false
+optional = true
 
 [dependencies.hashbrown]
-version = ">=0.14, <=0.15"
+version = "0.14"
 optional = true
 
 [dependencies.serde]
 version = "1"
 optional = true
 
-[dependencies.defmt]
+[dependencies.spacepackets]
-version = "0.3"
+version = "0.12"
-optional = true
+default-features = false
+git = "https://egit.irs.uni-stuttgart.de/rust/spacepackets"
+branch = "main"
 
 [features]
 default = ["std"]
 std = [
     "alloc",
-    "thiserror/std",
+    "thiserror",
     "spacepackets/std"
 ]
 alloc = [
     "hashbrown",
     "spacepackets/alloc"
 ]
-serde = ["dep:serde", "spacepackets/serde", "hashbrown/serde"]
+serde = ["dep:serde", "spacepackets/serde"]
-defmt = ["dep:defmt", "spacepackets/defmt"]
 
 [dev-dependencies]
 tempfile = "3"
 rand = "0.8"
 log = "0.4"
-fern = "0.7"
+fern = "0.6"
 chrono = "0.4"
-clap = { version = "4", features = ["derive"] }
 
 [package.metadata.docs.rs]
 all-features = true

README.md

@@ -13,14 +13,10 @@ The underlying base packet library used to generate the packets to be sent is th
 
 # Features
 
-The goal of this library is to be flexible enough to support the use-cases of both on-board
+`cfdp-rs` supports various runtime environments and is also suitable for `no_std` environments.
-software and of ground software. It has support to make integration on `std` systems as simple
+It is recommended to activate the `alloc` feature at the very least to allow using the primary
-as possible, but also has sufficient abstraction to allow for integration on`no_std` environments
+components provided by this crate. These components will only allocate memory at initialization
-and can be used on these systems as well as long as the `alloc` feature is activated.
+time and thus are still viable for systems where run-time allocation is prohibited.
-
-Please note even though the `alloc` feature is required for the core handlers, these components
-will only allocate memory at initialization time and thus are still viable for systems where
-run-time allocation is prohibited.
 
 ## Default features
 

coverage.py

@@ -20,7 +20,7 @@ def generate_cov_report(open_report: bool, format: str):
         out_path = "./target/debug/lcov.info"
     os.system(
         f"grcov . -s . --binary-path ./target/debug/ -t {format} --branch --ignore-not-existing "
-        f"--ignore \"examples/*\" -o {out_path}"
+        f"-o {out_path}"
     )
     if format == "lcov":
         os.system(

examples/python-interop/README.md

@@ -1,37 +0,0 @@
-Python Interoperability Example for cfdp-rs
-=======
-
-This example application showcases the interoperability of the CFDP handlers written in Rust
-with a Python implementation which uses [cfdp-py](https://github.com/us-irs/cfdp-py) library.
-
-Both the Rust and the Python app exchange packet data units via a UDP interface and launch
-both a destination and source handler. As such, they are both able to send and receive files.
-Both applications can be started with the command line argument `-f` to initiate a file transfer.
-You can run both applications with `-h` to get more information about the available options.
-
-## Running the Python App
-
-It is recommended to run the Python App in a dedicated virtual environment. For example, on a
-Unix system you can use `python3 -m venv venv` and then `source venv/bin/activate` to create
-and activate a virtual environment.
-
-After that, you can install the required dependencies using
-
-```sh
-pip install -r requirements.txt
-```
-
-and then run the application using `./main.py` or `python3 main.py`.
-
-It is recommended to run `./main.py -h` first to get an overview of some possible options.
-Running the Python App with `./main.py -f` will cause the Python App to start a file copy operation
-with fixed temporary paths.
-
-## Running the Rust App
-
-You can run the Rust application using `cargo`, for example `cargo run --example python-interop`.
-It is recommended to run `cargo run --example python-interop -- -h` to get an overview of some
-possible launch options.
-
-Running the Rust App with `cargo run --example python-interop -- -f` will cause the Rust app to
-start a file copy operation with fixed temporary paths.

examples/python-interop/main.py

@@ -1,9 +1,7 @@
 #!/usr/bin/env python3
 from datetime import timedelta
 from pathlib import Path
-import os
 import ipaddress
-import tempfile
 import socket
 import select
 import threading
@@ -53,6 +51,8 @@ from spacepackets.cfdp.tlv.msg_to_user import ProxyPutResponseParams
 from spacepackets.countdown import Countdown
 from spacepackets.seqcount import SeqCountProvider
 from spacepackets.util import ByteFieldU16, UnsignedByteField
+from tmtccmd.config.cfdp import CfdpParams, generic_cfdp_params_to_put_request
+from tmtccmd.config.args import add_cfdp_procedure_arguments, cfdp_args_to_cfdp_params
 
 
 PYTHON_ENTITY_ID = ByteFieldU16(1)
@@ -544,44 +544,23 @@ class CustomCheckTimerProvider(CheckTimerProvider):
 
 
 def main():
-    parser = argparse.ArgumentParser(
+    parser = argparse.ArgumentParser(prog="CFDP Local Entity Application")
-        prog="CFDP Local Entity Application",
-        formatter_class=argparse.RawTextHelpFormatter,
-    )
     parser.add_argument("-v", "--verbose", action="count", default=0)
-    parser.add_argument(
+    add_cfdp_procedure_arguments(parser)
-        "-f",
-        help="Perform a file-copy operation",
-        action="store_true",
-        dest="file_copy",
-    )
-    parser.add_argument(
-        "-m",
-        "--mode",
-        dest="transmission_mode",
-        help=(
-            f"Specify the transfer type{os.linesep}"
-            f' - "0" or "ack" for unacknowledged (Class 0) transfers{os.linesep}'
-            f' - "1" or "nak" for acknowledged (Class 1) transfers. Default value'
-        ),
-        default="nak",
-    )
-    # Optional Boolean argument where you can specify True/False
-    parser.add_argument(
-        "-c",
-        type=bool,
-        nargs="?",
-        const=True,
-        default=None,
-        dest="closure_requested",
-        help="Request transaction closure for the unacknowledged mode",
-    )
     args = parser.parse_args()
     stop_signal = threading.Event()
 
     logging_level = logging.INFO
     if args.verbose >= 1:
         logging_level = logging.DEBUG
+    if args.source is not None and args.target is not None:
+        # Generate a put request from the CLI arguments.
+        cfdp_params = CfdpParams()
+        cfdp_args_to_cfdp_params(args, cfdp_params)
+        put_req = generic_cfdp_params_to_put_request(
+            cfdp_params, PYTHON_ENTITY_ID, RUST_ENTITY_ID, PYTHON_ENTITY_ID
+        )
+        PUT_REQ_QUEUE.put(put_req)
 
     logging.basicConfig(level=logging_level)
 
@@ -632,6 +611,16 @@ def main():
     local_addr = ipaddress.ip_address("0.0.0.0")
     # Localhost as default.
     remote_addr = ipaddress.ip_address("127.0.0.1")
+    """
+    if Path(LOCAL_CFG_JSON_PATH).exists():
+        addr_from_cfg = parse_remote_addr_from_json(Path(LOCAL_CFG_JSON_PATH))
+        if addr_from_cfg is not None:
+            try:
+                remote_addr = ipaddress.ip_address(addr_from_cfg)
+            except ValueError:
+                _LOGGER.warning(f"invalid remote address {remote_addr} from JSON file")
+    """
+    _LOGGER.info(f"Put request will be sent to remote destination {remote_addr}")
     udp_server = UdpServer(
         sleep_time=0.1,
         addr=(str(local_addr), PY_PORT),
@@ -642,27 +631,6 @@ def main():
         stop_signal=stop_signal,
     )
 
-    # Prepare a put request / file copy operation if the user specifies it.
-    if args.file_copy:
-        _LOGGER.info("Performing file copy operation")
-        transmission_mode = None
-        if args.transmission_mode == "ack":
-            transmission_mode = TransmissionMode.ACKNOWLEDGED
-        elif args.transmission_mode == "nak":
-            transmission_mode = TransmissionMode.UNACKNOWLEDGED
-        with tempfile.NamedTemporaryFile(delete=False) as srcfile:
-            srcfile.write(FILE_CONTENT.encode())
-            srcfile_path = srcfile.name
-        tempdir = tempfile.TemporaryDirectory()
-        put_req = PutRequest(
-            destination_id=RUST_ENTITY_ID,
-            source_file=Path(srcfile_path),
-            dest_file=Path(tempdir.name).joinpath("test.txt"),
-            closure_requested=args.closure_requested,
-            trans_mode=transmission_mode,
-        )
-        PUT_REQ_QUEUE.put(put_req)
-
     source_entity_task.start()
     dest_entity_task.start()
     udp_server.start()

examples/python-interop/main.rs

@@ -15,9 +15,8 @@ use cfdp::{
     source::SourceHandler,
     user::{CfdpUser, FileSegmentRecvdParams, MetadataReceivedParams, TransactionFinishedParams},
     EntityType, IndicationConfig, LocalEntityConfig, PduOwnedWithInfo, PduProvider,
-    RemoteEntityConfig, StdTimerCreator, TransactionId, UserFaultHookProvider,
+    RemoteEntityConfig, StdCheckTimerCreator, TransactionId, UserFaultHookProvider,
 };
-use clap::Parser;
 use log::{debug, info, warn};
 use spacepackets::{
     cfdp::{
@@ -38,23 +37,6 @@ const LOG_LEVEL: log::LevelFilter = log::LevelFilter::Info;
 
 const FILE_DATA: &str = "Hello World!";
 
-#[derive(Debug, Copy, Clone, clap::ValueEnum)]
-pub enum TransmissionModeCli {
-    Nak,
-    Ack,
-}
-
-#[derive(clap::Parser)]
-#[command(about = "Arguments for executing a file copy operation")]
-pub struct Cli {
-    #[arg(short, help = "Perform a file copy operation")]
-    file_copy: bool,
-    #[arg(short, default_value = "nak")]
-    mode: Option<TransmissionModeCli>,
-    #[arg(short)]
-    closure_requested: Option<bool>,
-}
-
 #[derive(Default)]
 pub struct ExampleFaultHandler {}
 
@@ -295,7 +277,6 @@ fn pdu_printout(pdu: &PduOwnedWithInfo) {
 }
 
 fn main() {
-    let cli_args = Cli::parse();
     fern::Dispatch::new()
         .format(|out, message, record| {
             out.finish(format_args!(
@@ -346,7 +327,6 @@ fn main() {
         put_request_cacher,
         2048,
         remote_cfg_python,
-        StdTimerCreator::default(),
         seq_count_provider,
     );
     let mut cfdp_user_source = ExampleCfdpUser::new(EntityType::Sending);
@@ -362,27 +342,18 @@ fn main() {
         dest_tm_tx,
         NativeFilestore::default(),
         remote_cfg_python,
-        StdTimerCreator::default(),
+        StdCheckTimerCreator::default(),
     );
     let mut cfdp_user_dest = ExampleCfdpUser::new(EntityType::Receiving);
 
-    let put_request = if cli_args.file_copy {
+    let put_request = PutRequestOwned::new_regular_request(
-        Some(
-            PutRequestOwned::new_regular_request(
         PYTHON_ID.into(),
         srcfile.to_str().expect("invaid path string"),
         destfile.to_str().expect("invaid path string"),
-                cli_args.mode.map(|m| match m {
+        Some(TransmissionMode::Unacknowledged),
-                    TransmissionModeCli::Ack => TransmissionMode::Acknowledged,
+        Some(true),
-                    TransmissionModeCli::Nak => TransmissionMode::Unacknowledged,
-                }),
-                cli_args.closure_requested,
     )
-            .expect("put request creation failed"),
+    .expect("put request creation failed");
-        )
-    } else {
-        None
-    };
 
     let (source_tc_tx, source_tc_rx) = mpsc::channel();
     let (dest_tc_tx, dest_tc_rx) = mpsc::channel();
@@ -404,12 +375,9 @@ fn main() {
         .name("cfdp src entity".to_string())
         .spawn(move || {
             info!("Starting RUST SRC");
-            if let Some(put_request) = put_request {
-                info!("RUST SRC: Performing put request: {:?}", put_request);
             source_handler
                 .put_request(&put_request)
                 .expect("put request failed");
-            }
             loop {
                 let mut next_delay = None;
                 let mut undelayed_call_count = 0;
@@ -469,9 +437,7 @@ fn main() {
                         }
                     }
                     Err(e) => {
-                        println!("Dest handler error: {}", e);
+                        println!("Source handler error: {}", e);
-                        // TODO: I'd prefer a proper cancel request if a transfer is active..
-                        dest_handler.reset();
                         next_delay = Some(Duration::from_millis(50));
                     }
                 }

examples/python-interop/requirements.txt

@@ -1 +1,2 @@
 cfdp-py @ git+https://github.com/us-irs/cfdp-py.git@main
+tmtccmd == 8.0.2

src/filestore.rs

@@ -1,35 +1,90 @@
+use alloc::string::{String, ToString};
+use core::fmt::Display;
 use spacepackets::cfdp::ChecksumType;
 use spacepackets::ByteConversionError;
 #[cfg(feature = "std")]
+use std::error::Error;
+use std::path::Path;
+#[cfg(feature = "std")]
 pub use std_mod::*;
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, Clone)]
-#[cfg_attr(all(feature = "defmt", not(feature = "std")), derive(defmt::Format))]
-#[non_exhaustive]
 pub enum FilestoreError {
-    #[error("file does not exist")]
     FileDoesNotExist,
-    #[error("file already exists")]
     FileAlreadyExists,
-    #[error("directory does not exist")]
     DirDoesNotExist,
-    #[error("permission error")]
     Permission,
-    #[error("is not a file")]
     IsNotFile,
-    #[error("is not a directory")]
     IsNotDirectory,
-    #[error("byte conversion: {0}")]
+    ByteConversion(ByteConversionError),
-    ByteConversion(#[from] ByteConversionError),
+    Io {
-    #[error("IO error: {0})")]
+        raw_errno: Option<i32>,
-    #[cfg(feature = "std")]
+        string: String,
-    Io(#[from] std::io::Error),
+    },
-    #[error("checksum type not implemented: {0:?}")]
     ChecksumTypeNotImplemented(ChecksumType),
-    #[error("utf8 error")]
+}
-    Utf8Error,
+
-    #[error("other error")]
+impl From<ByteConversionError> for FilestoreError {
-    Other,
+    fn from(value: ByteConversionError) -> Self {
+        Self::ByteConversion(value)
+    }
+}
+
+impl Display for FilestoreError {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+        match self {
+            FilestoreError::FileDoesNotExist => {
+                write!(f, "file does not exist")
+            }
+            FilestoreError::FileAlreadyExists => {
+                write!(f, "file already exists")
+            }
+            FilestoreError::DirDoesNotExist => {
+                write!(f, "directory does not exist")
+            }
+            FilestoreError::Permission => {
+                write!(f, "permission error")
+            }
+            FilestoreError::IsNotFile => {
+                write!(f, "is not a file")
+            }
+            FilestoreError::IsNotDirectory => {
+                write!(f, "is not a directory")
+            }
+            FilestoreError::ByteConversion(e) => {
+                write!(f, "filestore error: {e}")
+            }
+            FilestoreError::Io { raw_errno, string } => {
+                write!(
+                    f,
+                    "filestore generic IO error with raw errno {:?}: {}",
+                    raw_errno, string
+                )
+            }
+            FilestoreError::ChecksumTypeNotImplemented(checksum_type) => {
+                write!(f, "checksum {:?} not implemented", checksum_type)
+            }
+        }
+    }
+}
+
+impl Error for FilestoreError {
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+        match self {
+            FilestoreError::ByteConversion(e) => Some(e),
+            _ => None,
+        }
+    }
+}
+
+#[cfg(feature = "std")]
+impl From<std::io::Error> for FilestoreError {
+    fn from(value: std::io::Error) -> Self {
+        Self::Io {
+            raw_errno: value.raw_os_error(),
+            string: value.to_string(),
+        }
+    }
 }
 
 pub trait VirtualFilestore {
@@ -56,7 +111,14 @@ pub trait VirtualFilestore {
 
     fn filename_from_full_path(path: &str) -> Option<&str>
     where
-        Self: Sized;
+        Self: Sized,
+    {
+        // Convert the path string to a Path
+        let path = Path::new(path);
+
+        // Extract the file name using the file_name() method
+        path.file_name().and_then(|name| name.to_str())
+    }
 
     fn is_file(&self, path: &str) -> Result<bool, FilestoreError>;
 
@@ -66,11 +128,6 @@ pub trait VirtualFilestore {
 
     fn exists(&self, path: &str) -> Result<bool, FilestoreError>;
 
-    /// Extract the file name part of a full path.
-    ///
-    /// This method should behave similarly to the [std::path::Path::file_name] method.
-    fn file_name<'a>(&self, full_path: &'a str) -> Result<Option<&'a str>, FilestoreError>;
-
     fn file_size(&self, path: &str) -> Result<u64, FilestoreError>;
 
     /// This special function is the CFDP specific abstraction to calculate the checksum of a file.
@@ -84,7 +141,6 @@ pub trait VirtualFilestore {
         &self,
         file_path: &str,
         checksum_type: ChecksumType,
-        size_to_verify: u64,
         verification_buf: &mut [u8],
     ) -> Result<u32, FilestoreError>;
 
@@ -97,14 +153,13 @@ pub trait VirtualFilestore {
     /// 4096 or 8192 bytes.
     fn checksum_verify(
         &self,
-        expected_checksum: u32,
         file_path: &str,
         checksum_type: ChecksumType,
-        size_to_verify: u64,
+        expected_checksum: u32,
         verification_buf: &mut [u8],
     ) -> Result<bool, FilestoreError> {
         Ok(
-            self.calculate_checksum(file_path, checksum_type, size_to_verify, verification_buf)?
+            self.calculate_checksum(file_path, checksum_type, verification_buf)?
                 == expected_checksum,
         )
     }
@@ -121,7 +176,6 @@ pub mod std_mod {
     use std::{
         fs::{self, File, OpenOptions},
         io::{BufReader, Read, Seek, SeekFrom, Write},
-        path::Path,
     };
 
     #[derive(Default)]
@@ -147,13 +201,6 @@ pub mod std_mod {
             Ok(())
         }
 
-        fn file_name<'a>(&self, full_path: &'a str) -> Result<Option<&'a str>, FilestoreError> {
-            let path = Path::new(full_path);
-            path.file_name()
-                .map(|s| s.to_str())
-                .ok_or(FilestoreError::Utf8Error)
-        }
-
         fn truncate_file(&self, file_path: &str) -> Result<(), FilestoreError> {
             if !self.exists(file_path)? {
                 return Err(FilestoreError::FileDoesNotExist);
@@ -169,7 +216,10 @@ pub mod std_mod {
         }
 
         fn create_dir(&self, dir_path: &str) -> Result<(), FilestoreError> {
-            fs::create_dir(dir_path)?;
+            fs::create_dir(dir_path).map_err(|e| FilestoreError::Io {
+                raw_errno: e.raw_os_error(),
+                string: e.to_string(),
+            })?;
             Ok(())
         }
 
@@ -255,23 +305,18 @@ pub mod std_mod {
             &self,
             file_path: &str,
             checksum_type: ChecksumType,
-            size_to_verify: u64,
             verification_buf: &mut [u8],
         ) -> Result<u32, FilestoreError> {
             let mut calc_with_crc_lib = |crc: Crc<u32>| -> Result<u32, FilestoreError> {
                 let mut digest = crc.digest();
-                let mut buf_reader = BufReader::new(File::open(file_path)?);
+                let file_to_check = File::open(file_path)?;
-                let mut remaining_bytes = size_to_verify;
+                let mut buf_reader = BufReader::new(file_to_check);
-                while remaining_bytes > 0 {
+                loop {
-                    // Read the smaller of the remaining bytes or the buffer size
+                    let bytes_read = buf_reader.read(verification_buf)?;
-                    let bytes_to_read = remaining_bytes.min(verification_buf.len() as u64) as usize;
-                    let bytes_read = buf_reader.read(&mut verification_buf[0..bytes_to_read])?;
-
                     if bytes_read == 0 {
-                        break; // Reached end of file
+                        break;
                     }
                     digest.update(&verification_buf[0..bytes_read]);
-                    remaining_bytes -= bytes_read as u64;
                 }
                 Ok(digest.finalize())
             };
@@ -283,17 +328,6 @@ pub mod std_mod {
                 _ => Err(FilestoreError::ChecksumTypeNotImplemented(checksum_type)),
             }
         }
-
-        fn filename_from_full_path(path: &str) -> Option<&str>
-        where
-            Self: Sized,
-        {
-            // Convert the path string to a Path
-            let path = Path::new(path);
-
-            // Extract the file name using the file_name() method
-            path.file_name().and_then(|name| name.to_str())
-        }
     }
 
     impl NativeFilestore {
@@ -329,7 +363,7 @@ pub mod std_mod {
 
 #[cfg(test)]
 mod tests {
-    use std::{fs, path::Path, println, string::ToString};
+    use std::{fs, path::Path, println};
 
     use super::*;
     use alloc::format;
@@ -642,7 +676,7 @@ mod tests {
             }
             assert_eq!(
                 error.to_string(),
-                format!("byte conversion: {}", byte_conv_error)
+                format!("filestore error: {}", byte_conv_error)
             );
         } else {
             panic!("unexpected error");
@@ -721,10 +755,9 @@ mod tests {
         checksum = checksum.wrapping_add(u32::from_be_bytes(buffer));
         let mut verif_buf: [u8; 32] = [0; 32];
         let result = NATIVE_FS.checksum_verify(
-            checksum,
             file_path.to_str().unwrap(),
             ChecksumType::Modular,
-            EXAMPLE_DATA_CFDP.len() as u64,
+            checksum,
             &mut verif_buf,
         );
         assert!(result.is_ok());
@@ -737,7 +770,6 @@ mod tests {
         // The file to check does not even need to exist, and the verification buffer can be
         // empty: the null checksum is always yields the same result.
         let result = NATIVE_FS.checksum_verify(
-            0,
             file_path.to_str().unwrap(),
             ChecksumType::NullChecksum,
             0,
@@ -754,7 +786,6 @@ mod tests {
         // The file to check does not even need to exist, and the verification buffer can be
         // empty: the null checksum is always yields the same result.
         let result = NATIVE_FS.checksum_verify(
-            0,
             file_path.to_str().unwrap(),
             ChecksumType::Crc32Proximity1,
             0,
@@ -765,7 +796,7 @@ mod tests {
         if let FilestoreError::ChecksumTypeNotImplemented(cksum_type) = error {
             assert_eq!(
                 error.to_string(),
-                format!("checksum type not implemented: {:?}", cksum_type)
+                format!("checksum {:?} not implemented", cksum_type)
             );
         } else {
             panic!("unexpected error");

src/lib.rs

@@ -1,69 +1,5 @@
-//! This module contains the implementation of the CCSDS File Delivery Protocol (CFDP) high level
+//! This module contains the implementation of the CFDP high level abstractions as specified in
-//! abstractions as specified in CCSDS 727.0-B-5.
+//! CCSDS 727.0-B-5.
-//!
-//! The basic idea of CFDP is to convert files of any size into a stream of packets called packet
-//! data units (PDU). CFPD has an unacknowledged and acknowledged mode, with the option to request
-//! a transaction closure for the unacknowledged mode. Using the unacknowledged mode with no
-//! transaction closure is applicable for simplex communication paths, while the unacknowledged
-//! mode with closure is the easiest way to get a confirmation of a successful file transfer,
-//! including a CRC check on the remote side to verify file integrity. The acknowledged mode is
-//! the most complex mode which includes multiple mechanism to ensure succesfull packet transaction
-//! even for unreliable connections, including lost segment detection. As such, it can be compared
-//! to a specialized TCP for file transfers with remote systems.
-//!
-//! The goal of this library is to be flexible enough to support the use-cases of both on-board
-//! software and of ground software. It has support to make integration on [std] systems as simple
-//! as possible, but also has sufficient abstraction to allow for integration on `no_std`
-//! environments and can be used on these systems as well as long as the [alloc] feature is used
-//! as well.
-//!
-//! Please note even though the [alloc] feature is required for the core handlers, these components
-//! will only allocate memory at initialization time and thus are still viable for systems where
-//! run-time allocation is prohibited.
-//!
-//! The core of this library are the [crate::dest::DestinationHandler] and the
-//! [crate::source::SourceHandler] components which model the CFDP destination and source entity
-//! respectively. You can find high-level and API documentation for both handlers in the respective
-//! [crate::dest] and [crate::source] module.
-//!
-//! # Examples
-//!
-//! This library currently features two example application which showcase how the provided
-//! components could be used to provide CFDP services.
-//!
-//! The [end-to-end test](https://egit.irs.uni-stuttgart.de/rust/cfdp/src/branch/main/tests/end-to-end.rs)
-//! is an integration tests which spawns a CFDP source entity and a CFDP destination entity,
-//! moves them to separate threads and then performs a small file copy operation.
-//! You can run the integration test for a transfer with no closure and with printout to the
-//! standard console by running:
-//!
-//! ```sh
-//! cargo test end_to_end_test_no_closure -- --nocapture
-//! ```
-//!
-//! or with closure:
-//!
-//! ```sh
-//! cargo test end_to_end_test_with_closure -- --nocapture
-//! ```
-//!
-//! The [Python Interoperability](https://egit.irs.uni-stuttgart.de/rust/cfdp/src/branch/main/examples/python-interop)
-//! example showcases the interoperability of the CFDP handlers written in Rust with a Python
-//! implementation. The dedicated example documentation shows how to run this example.
-//!
-//! # Notes on the user hooks and scheduling
-//!
-//! Both examples feature implementations of the [UserFaultHookProvider] and the [user::CfdpUser]
-//! trait which simply print some information to the console to monitor the progress of a file
-//! copy operation. These implementations could be adapted for other handler integrations. For
-//! example, they could signal a GUI application to display some information for the user.
-//!
-//! Even though both examples move the newly spawned handlers to dedicated threads, this is not
-//! the only way they could be scheduled. For example, to support an arbitrary (or bounded)
-//! amount of file copy operations on either source or destination side, those handlers could be
-//! moved into a [std::collections::HashMap] structure which is then scheduled inside a thread, or
-//! you could schedule a fixed amount of handlers inside a
-//! [threadpool](https://docs.rs/threadpool/latest/threadpool/).
 #![no_std]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 #[cfg(feature = "alloc")]
@@ -71,11 +7,12 @@ extern crate alloc;
 #[cfg(any(feature = "std", test))]
 extern crate std;
 
-#[cfg(feature = "alloc")]
+#[cfg(feature = "std")]
 pub mod dest;
+#[cfg(feature = "alloc")]
 pub mod filestore;
 pub mod request;
-#[cfg(feature = "alloc")]
+#[cfg(feature = "std")]
 pub mod source;
 pub mod time;
 pub mod user;
@@ -83,10 +20,11 @@ pub mod user;
 use crate::time::CountdownProvider;
 use core::{cell::RefCell, fmt::Debug, hash::Hash};
 use crc::{Crc, CRC_32_ISCSI, CRC_32_ISO_HDLC};
+#[cfg(feature = "std")]
+use hashbrown::HashMap;
 
 #[cfg(feature = "alloc")]
 pub use alloc_mod::*;
-use core::time::Duration;
 #[cfg(feature = "serde")]
 use serde::{Deserialize, Serialize};
 use spacepackets::{
@@ -97,19 +35,16 @@ use spacepackets::{
     util::{UnsignedByteField, UnsignedEnum},
 };
 #[cfg(feature = "std")]
+use std::time::Duration;
+#[cfg(feature = "std")]
 pub use std_mod::*;
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
-#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub enum EntityType {
     Sending,
     Receiving,
 }
 
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
-#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub enum TimerContext {
     CheckLimit {
         local_id: UnsignedByteField,
@@ -117,10 +52,10 @@ pub enum TimerContext {
         entity_type: EntityType,
     },
     NakActivity {
-        expiry_time: Duration,
+        expiry_time_seconds: f32,
     },
     PositiveAck {
-        expiry_time: Duration,
+        expiry_time_seconds: f32,
     },
 }
 
@@ -161,10 +96,10 @@ pub enum TimerContext {
 /// The timer will be used to perform the Positive Acknowledgement Procedures as  specified in
 /// 4.7. 1of the CFDP standard. The expiration period will be provided by the Positive ACK timer
 /// interval of the remote entity configuration.
-pub trait TimerCreatorProvider {
+pub trait CheckTimerProviderCreator {
-    type Countdown: CountdownProvider;
+    type CheckTimer: CountdownProvider;
 
-    fn create_countdown(&self, timer_context: TimerContext) -> Self::Countdown;
+    fn create_check_timer_provider(&self, timer_context: TimerContext) -> Self::CheckTimer;
 }
 
 /// This structure models the remote entity configuration information as specified in chapter 8.3
@@ -227,8 +162,6 @@ pub trait TimerCreatorProvider {
 /// * `nak_timer_expiration_limit` - See the notes on the Deferred Lost Segment Procedure inside
 ///    the class documentation. Defaults to 2, so the timer may expire two times.
 #[derive(Debug, Copy, Clone)]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
-#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub struct RemoteEntityConfig {
     pub entity_id: UnsignedByteField,
     pub max_packet_len: usize,
@@ -286,12 +219,9 @@ pub trait RemoteEntityConfigProvider {
     fn remove_config(&mut self, remote_id: u64) -> bool;
 }
 
-/// This is a thin wrapper around a [hashbrown::HashMap] to store remote entity configurations.
+#[cfg(feature = "std")]
-/// It implements the full [RemoteEntityConfigProvider] trait.
+#[derive(Default)]
-#[cfg(feature = "alloc")]
+pub struct StdRemoteEntityConfigProvider(pub HashMap<u64, RemoteEntityConfig>);
-#[derive(Default, Debug)]
-#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-pub struct StdRemoteEntityConfigProvider(pub hashbrown::HashMap<u64, RemoteEntityConfig>);
 
 #[cfg(feature = "std")]
 impl RemoteEntityConfigProvider for StdRemoteEntityConfigProvider {
@@ -309,12 +239,8 @@ impl RemoteEntityConfigProvider for StdRemoteEntityConfigProvider {
     }
 }
 
-/// This is a thin wrapper around a [alloc::vec::Vec] to store remote entity configurations.
-/// It implements the full [RemoteEntityConfigProvider] trait.
 #[cfg(feature = "alloc")]
-#[derive(Default, Debug)]
+#[derive(Default)]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
-#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub struct VecRemoteEntityConfigProvider(pub alloc::vec::Vec<RemoteEntityConfig>);
 
 #[cfg(feature = "alloc")]
@@ -347,9 +273,6 @@ impl RemoteEntityConfigProvider for VecRemoteEntityConfigProvider {
     }
 }
 
-/// A remote entity configurations also implements the [RemoteEntityConfigProvider], but the
-/// [RemoteEntityConfigProvider::add_config] and [RemoteEntityConfigProvider::remove_config]
-/// are no-ops and always returns [false].
 impl RemoteEntityConfigProvider for RemoteEntityConfig {
     fn get(&self, remote_id: u64) -> Option<&RemoteEntityConfig> {
         if remote_id == self.entity_id.value() {
@@ -377,7 +300,7 @@ impl RemoteEntityConfigProvider for RemoteEntityConfig {
 /// This trait introduces some callbacks which will be called when a particular CFDP fault
 /// handler is called.
 ///
-/// It is passed into the CFDP handlers as part of the [UserFaultHookProvider] and the local entity
+/// It is passed into the CFDP handlers as part of the [DefaultFaultHandler] and the local entity
 /// configuration and provides a way to specify custom user error handlers. This allows to
 /// implement some CFDP features like fault handler logging, which would not be possible
 /// generically otherwise.
@@ -404,8 +327,6 @@ pub trait UserFaultHookProvider {
     fn ignore_cb(&mut self, transaction_id: TransactionId, cond: ConditionCode, progress: u64);
 }
 
-/// Dummy fault hook which implements [UserFaultHookProvider] but only provides empty
-/// implementations.
 #[derive(Default, Debug, PartialEq, Eq, Copy, Clone)]
 pub struct DummyFaultHook {}
 
@@ -443,7 +364,7 @@ impl UserFaultHookProvider for DummyFaultHook {
 /// It does so by mapping each applicable [spacepackets::cfdp::ConditionCode] to a fault handler
 /// which is denoted by the four [spacepackets::cfdp::FaultHandlerCode]s. This code is used
 /// to select the error handling inside the CFDP handler itself in addition to dispatching to a
-/// user-provided callback function provided by the [UserFaultHookProvider].
+/// user-provided callback function provided by the [UserFaultHandler].
 ///
 /// Some note on the provided default settings:
 ///
@@ -544,9 +465,6 @@ impl<UserHandler: UserFaultHookProvider> FaultHandler<UserHandler> {
     }
 }
 
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
-#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub struct IndicationConfig {
     pub eof_sent: bool,
     pub eof_recv: bool,
@@ -569,7 +487,6 @@ impl Default for IndicationConfig {
     }
 }
 
-/// Each CFDP entity handler has a [LocalEntityConfig]uration.
 pub struct LocalEntityConfig<UserFaultHook: UserFaultHookProvider> {
     pub id: UnsignedByteField,
     pub indication_cfg: IndicationConfig,
@@ -646,29 +563,31 @@ pub mod std_mod {
         }
     }
 
-    /// Simple implementation of the [CountdownProvider] trait assuming a standard runtime.
+    /// Simple implementation of the [CheckTimerCreator] trait assuming a standard runtime.
+    /// It also assumes that a second accuracy of the check timer period is sufficient.
     #[derive(Debug)]
-    pub struct StdCountdown {
+    pub struct StdCheckTimer {
-        expiry_time: Duration,
+        expiry_time_seconds: u64,
         start_time: std::time::Instant,
     }
 
-    impl StdCountdown {
+    impl StdCheckTimer {
-        pub fn new(expiry_time: Duration) -> Self {
+        pub fn new(expiry_time_seconds: u64) -> Self {
             Self {
-                expiry_time,
+                expiry_time_seconds,
                 start_time: std::time::Instant::now(),
             }
         }
 
         pub fn expiry_time_seconds(&self) -> u64 {
-            self.expiry_time.as_secs()
+            self.expiry_time_seconds
         }
     }
 
-    impl CountdownProvider for StdCountdown {
+    impl CountdownProvider for StdCheckTimer {
         fn has_expired(&self) -> bool {
-            if self.start_time.elapsed() > self.expiry_time {
+            let elapsed_time = self.start_time.elapsed();
+            if elapsed_time.as_nanos() > self.expiry_time_seconds as u128 * 1_000_000_000 {
                 return true;
             }
             false
@@ -679,36 +598,40 @@ pub mod std_mod {
         }
     }
 
-    pub struct StdTimerCreator {
+    pub struct StdCheckTimerCreator {
-        pub check_limit_timeout: Duration,
+        pub check_limit_timeout_secs: u64,
     }
 
-    impl StdTimerCreator {
+    impl StdCheckTimerCreator {
-        pub const fn new(check_limit_timeout: Duration) -> Self {
+        pub const fn new(check_limit_timeout_secs: u64) -> Self {
             Self {
-                check_limit_timeout,
+                check_limit_timeout_secs,
             }
         }
     }
 
-    impl Default for StdTimerCreator {
+    impl Default for StdCheckTimerCreator {
         fn default() -> Self {
-            Self::new(Duration::from_secs(5))
+            Self::new(5)
         }
     }
 
-    impl TimerCreatorProvider for StdTimerCreator {
+    impl CheckTimerProviderCreator for StdCheckTimerCreator {
-        type Countdown = StdCountdown;
+        type CheckTimer = StdCheckTimer;
 
-        fn create_countdown(&self, timer_context: TimerContext) -> Self::Countdown {
+        fn create_check_timer_provider(&self, timer_context: TimerContext) -> Self::CheckTimer {
             match timer_context {
                 TimerContext::CheckLimit {
                     local_id: _,
                     remote_id: _,
                     entity_type: _,
-                } => StdCountdown::new(self.check_limit_timeout),
+                } => StdCheckTimer::new(self.check_limit_timeout_secs),
-                TimerContext::NakActivity { expiry_time } => StdCountdown::new(expiry_time),
+                TimerContext::NakActivity {
-                TimerContext::PositiveAck { expiry_time } => StdCountdown::new(expiry_time),
+                    expiry_time_seconds,
+                } => StdCheckTimer::new(Duration::from_secs_f32(expiry_time_seconds).as_secs()),
+                TimerContext::PositiveAck {
+                    expiry_time_seconds,
+                } => StdCheckTimer::new(Duration::from_secs_f32(expiry_time_seconds).as_secs()),
             }
         }
     }
@@ -718,7 +641,6 @@ pub mod std_mod {
 /// number of that transfer which is also determined by the CFDP source entity.
 #[derive(Debug, Eq, Copy, Clone)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct TransactionId {
     source_id: UnsignedByteField,
     seq_num: UnsignedByteField,
@@ -760,15 +682,11 @@ pub enum State {
     Suspended = 2,
 }
 
-/// [crc::Crc] instance using [crc::CRC_32_ISO_HDLC].
+/// SANA registry entry: https://sanaregistry.org/r/checksum_identifiers/records/4
-///
+/// Entry in CRC catalogue: https://reveng.sourceforge.io/crc-catalogue/all.htm#crc.cat.crc-32
-/// SANA registry entry: <https://sanaregistry.org/r/checksum_identifiers/records/4>,
-/// Entry in CRC catalogue: <https://reveng.sourceforge.io/crc-catalogue/all.htm#crc.cat.crc-32>
 pub const CRC_32: Crc<u32> = Crc::<u32>::new(&CRC_32_ISO_HDLC);
-/// [crc::Crc] instance using [crc::CRC_32_ISCSI].
+/// SANA registry entry: https://sanaregistry.org/r/checksum_identifiers/records/3
-///
+/// Entry in CRC catalogue: https://reveng.sourceforge.io/crc-catalogue/all.htm#crc.cat.crc-32-iscsi
-/// SANA registry entry: <https://sanaregistry.org/r/checksum_identifiers/records/3>,
-/// Entry in CRC catalogue: <https://reveng.sourceforge.io/crc-catalogue/all.htm#crc.cat.crc-32-iscsi>
 pub const CRC_32C: Crc<u32> = Crc::<u32>::new(&CRC_32_ISCSI);
 
 #[derive(Debug, PartialEq, Eq, Copy, Clone)]
@@ -778,8 +696,6 @@ pub enum PacketTarget {
     DestEntity,
 }
 
-/// Generic trait which models a raw CFDP packet data unit (PDU) block with some additional context
-/// information.
 pub trait PduProvider {
     fn pdu_type(&self) -> PduType;
     fn file_directive_type(&self) -> Option<FileDirectiveType>;
@@ -877,7 +793,7 @@ impl<'raw> PduRawWithInfo<'raw> {
             });
         }
         if pdu_header.pdu_datafield_len() < 1 {
-            return Err(PduError::Format);
+            return Err(PduError::FormatError);
         }
         // Route depending on PDU type and directive type if applicable. Retrieve directive type
         // from the raw stream for better performance (with sanity and directive code check).
@@ -1003,7 +919,7 @@ pub(crate) mod tests {
     };
     use user::{CfdpUser, OwnedMetadataRecvdParams, TransactionFinishedParams};
 
-    use crate::{PacketTarget, StdCountdown};
+    use crate::{PacketTarget, StdCheckTimer};
 
     use super::*;
 
@@ -1353,7 +1269,7 @@ pub(crate) mod tests {
 
     #[test]
     fn test_std_check_timer() {
-        let mut std_check_timer = StdCountdown::new(Duration::from_secs(1));
+        let mut std_check_timer = StdCheckTimer::new(1);
         assert!(!std_check_timer.has_expired());
         assert_eq!(std_check_timer.expiry_time_seconds(), 1);
         std::thread::sleep(Duration::from_millis(800));
@@ -1366,9 +1282,10 @@ pub(crate) mod tests {
 
     #[test]
     fn test_std_check_timer_creator() {
-        let std_check_timer_creator = StdTimerCreator::new(Duration::from_secs(1));
+        let std_check_timer_creator = StdCheckTimerCreator::new(1);
-        let check_timer = std_check_timer_creator.create_countdown(TimerContext::NakActivity {
+        let check_timer =
-            expiry_time: Duration::from_secs(1),
+            std_check_timer_creator.create_check_timer_provider(TimerContext::NakActivity {
+                expiry_time_seconds: 1.0,
             });
         assert_eq!(check_timer.expiry_time_seconds(), 1);
     }
@@ -1546,7 +1463,7 @@ pub(crate) mod tests {
 
     #[test]
     fn transaction_id_hashable_usable_as_map_key() {
-        let mut map = hashbrown::HashMap::new();
+        let mut map = HashMap::new();
         let transaction_id_0 = TransactionId::new(
             UnsignedByteFieldU8::new(1).into(),
             UnsignedByteFieldU8::new(2).into(),

src/request.rs

@@ -10,8 +10,6 @@ use spacepackets::{
 pub use alloc_mod::*;
 
 #[derive(Debug, PartialEq, Eq)]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
-#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct FilePathTooLarge(pub usize);
 
 /// This trait is an abstraction for different Put Request structures which can be used
@@ -169,8 +167,6 @@ impl<'src_file, 'dest_file> PutRequest<'src_file, 'dest_file, 'static, 'static,
 }
 
 #[derive(Debug, PartialEq, Eq)]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
-#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct TlvWithInvalidType(pub(crate) ());
 
 impl<'msgs_to_user> PutRequest<'static, 'static, 'msgs_to_user, 'static, 'static, 'static> {
@@ -240,7 +236,6 @@ pub mod alloc_mod {
     /// Owned variant of [PutRequest] with no lifetimes which is also [Clone]able.
     #[derive(Debug, Clone, PartialEq, Eq)]
     #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
-    #[cfg_attr(feature = "defmt", derive(defmt::Format))]
     pub struct PutRequestOwned {
         pub destination_id: UnsignedByteField,
         source_file: Option<alloc::string::String>,

src/user.rs

@@ -15,8 +15,6 @@ use spacepackets::{
 use super::TransactionId;
 
 #[derive(Debug, Copy, Clone)]
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
-#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct TransactionFinishedParams {
     pub id: TransactionId,
     pub condition_code: ConditionCode,

tests/end-to-end.rs

@@ -14,7 +14,7 @@ use cfdp::{
     source::SourceHandler,
     user::{CfdpUser, FileSegmentRecvdParams, MetadataReceivedParams, TransactionFinishedParams},
     EntityType, IndicationConfig, LocalEntityConfig, PduOwnedWithInfo, RemoteEntityConfig,
-    StdTimerCreator, TransactionId, UserFaultHookProvider,
+    StdCheckTimerCreator, TransactionId, UserFaultHookProvider,
 };
 use spacepackets::{
     cfdp::{ChecksumType, ConditionCode, TransmissionMode},
@@ -202,7 +202,6 @@ fn end_to_end_test(with_closure: bool) {
         put_request_cacher,
         2048,
         remote_cfg_of_dest,
-        StdTimerCreator::default(),
         seq_count_provider,
     );
     let mut cfdp_user_source = ExampleCfdpUser::new(EntityType::Sending, completion_signal_source);
@@ -226,7 +225,7 @@ fn end_to_end_test(with_closure: bool) {
         dest_tx,
         NativeFilestore::default(),
         remote_cfg_of_source,
-        StdTimerCreator::default(),
+        StdCheckTimerCreator::default(),
     );
     let mut cfdp_user_dest = ExampleCfdpUser::new(EntityType::Receiving, completion_signal_dest);