work on uniform API

- Add source_data getter for PusTm
- Add std time info updater for CDS short time stamp provider

CHANGELOG.md

@@ -6,9 +6,17 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
-## [unreleased]
+# [unreleased]
 
-## [v0.1.0] 16.08.2022
+## Added
+
+- Basic support for ECSS enumeration types for u8, u16, u32 and u64
+
+## Changed
+
+- Better names for generic error enumerations: `PacketError` renamed to `ByteConversionError`
+
+# [v0.1.0] 16.08.2022
 
 Initial release with CCSDS Space Packet Primary Header implementation and basic PUS TC and TM
 implementations.

src/ecss.rs

@@ -1,6 +1,6 @@
 //! 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/)
-use crate::{CcsdsPacket, PacketError};
+use crate::{ByteConversionError, CcsdsPacket, SizeMissmatch};
 use core::mem::size_of;
 use crc::{Crc, CRC_16_IBM_3740};
 use serde::{Deserialize, Serialize};
@@ -41,7 +41,7 @@ pub enum PusError {
     NoRawData,
     /// CRC16 needs to be calculated first
     CrcCalculationMissing,
-    PacketError(PacketError),
+    PacketError(ByteConversionError),
 }
 
 pub trait PusPacket: CcsdsPacket {
@@ -135,3 +135,156 @@ macro_rules! sp_header_impls {
 
 pub(crate) use ccsds_impl;
 pub(crate) use sp_header_impls;
+
+pub trait EcssEnumeration {
+    fn pfc(&self) -> u8;
+    fn byte_width(&self) -> usize {
+        (self.pfc() / 8) as usize
+    }
+    fn write_to_bytes(&self, buf: &mut [u8]) -> Result<(), ByteConversionError>;
+}
+
+trait ToBeBytes {
+    type ByteArray: AsRef<[u8]>;
+    fn to_be_bytes(&self) -> Self::ByteArray;
+}
+
+impl ToBeBytes for u8 {
+    type ByteArray = [u8; 1];
+
+    fn to_be_bytes(&self) -> Self::ByteArray {
+        u8::to_be_bytes(*self)
+    }
+}
+
+impl ToBeBytes for u16 {
+    type ByteArray = [u8; 2];
+
+    fn to_be_bytes(&self) -> Self::ByteArray {
+        u16::to_be_bytes(*self)
+    }
+}
+
+impl ToBeBytes for u32 {
+    type ByteArray = [u8; 4];
+
+    fn to_be_bytes(&self) -> Self::ByteArray {
+        u32::to_be_bytes(*self)
+    }
+}
+
+impl ToBeBytes for u64 {
+    type ByteArray = [u8; 8];
+
+    fn to_be_bytes(&self) -> Self::ByteArray {
+        u64::to_be_bytes(*self)
+    }
+}
+
+pub struct GenericEcssEnumWrapper<TYPE> {
+    val: TYPE,
+}
+
+impl<TYPE> GenericEcssEnumWrapper<TYPE> {
+    pub fn new(val: TYPE) -> Self {
+        Self { val }
+    }
+}
+
+impl<TYPE: ToBeBytes> EcssEnumeration for GenericEcssEnumWrapper<TYPE> {
+    fn pfc(&self) -> u8 {
+        size_of::<TYPE>() as u8 * 8_u8
+    }
+
+    fn write_to_bytes(&self, buf: &mut [u8]) -> Result<(), ByteConversionError> {
+        if buf.len() < self.byte_width() as usize {
+            return Err(ByteConversionError::ToSliceTooSmall(SizeMissmatch {
+                found: buf.len(),
+                expected: self.byte_width() as usize,
+            }));
+        }
+        buf[0..self.byte_width() as usize].copy_from_slice(self.val.to_be_bytes().as_ref());
+        Ok(())
+    }
+}
+
+pub type EcssEnumU8 = GenericEcssEnumWrapper<u8>;
+pub type EcssEnumU16 = GenericEcssEnumWrapper<u16>;
+pub type EcssEnumU32 = GenericEcssEnumWrapper<u32>;
+pub type EcssEnumU64 = GenericEcssEnumWrapper<u64>;
+
+#[cfg(test)]
+mod tests {
+    use crate::ecss::{EcssEnumU16, EcssEnumU32, EcssEnumU8, EcssEnumeration};
+    use crate::ByteConversionError;
+
+    #[test]
+    fn test_enum_u8() {
+        let mut buf = [0, 0, 0];
+        let my_enum = EcssEnumU8::new(1);
+        my_enum
+            .write_to_bytes(&mut buf[1..2])
+            .expect("To byte conversion of u8 failed");
+        assert_eq!(buf[1], 1);
+    }
+
+    #[test]
+    fn test_enum_u16() {
+        let mut buf = [0, 0, 0];
+        let my_enum = EcssEnumU16::new(0x1f2f);
+        my_enum
+            .write_to_bytes(&mut buf[1..3])
+            .expect("To byte conversion of u8 failed");
+        assert_eq!(buf[1], 0x1f);
+        assert_eq!(buf[2], 0x2f);
+    }
+
+    #[test]
+    fn test_slice_u16_too_small() {
+        let mut buf = [0];
+        let my_enum = EcssEnumU16::new(0x1f2f);
+        let res = my_enum.write_to_bytes(&mut buf[0..1]);
+        assert!(res.is_err());
+        let error = res.unwrap_err();
+        match error {
+            ByteConversionError::ToSliceTooSmall(missmatch) => {
+                assert_eq!(missmatch.expected, 2);
+                assert_eq!(missmatch.found, 1);
+            }
+            _ => {
+                panic!("Unexpected error {:?}", error);
+            }
+        }
+    }
+
+    #[test]
+    fn test_enum_u32() {
+        let mut buf = [0, 0, 0, 0, 0];
+        let my_enum = EcssEnumU32::new(0x1f2f3f4f);
+        my_enum
+            .write_to_bytes(&mut buf[1..5])
+            .expect("To byte conversion of u8 failed");
+        assert_eq!(buf[1], 0x1f);
+        assert_eq!(buf[2], 0x2f);
+        assert_eq!(buf[3], 0x3f);
+        assert_eq!(buf[4], 0x4f);
+    }
+
+    #[test]
+    fn test_slice_u32_too_small() {
+        let mut buf = [0, 0, 0, 0, 0];
+        let my_enum = EcssEnumU32::new(0x1f2f3f4f);
+        let res = my_enum.write_to_bytes(&mut buf[0..3]);
+        assert!(res.is_err());
+        let error = res.unwrap_err();
+        match error {
+            ByteConversionError::ToSliceTooSmall(missmatch) => {
+                assert_eq!(missmatch.expected, 4);
+                assert_eq!(missmatch.found, 3);
+            }
+            _ => {
+                panic!("Unexpected error {:?}", error);
+            }
+        }
+    }
+}

src/lib.rs

@@ -46,7 +46,7 @@
 #![no_std]
 #[cfg(feature = "alloc")]
 extern crate alloc;
-#[cfg(feature = "std")]
+#[cfg(any(feature = "std", test))]
 extern crate std;
 
 use crate::ecss::CCSDS_HEADER_LEN;
@@ -59,20 +59,22 @@ pub mod tc;
 pub mod time;
 pub mod tm;
 
+pub const MAX_APID: u16 = 2u16.pow(11) - 1;
+
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 pub struct SizeMissmatch {
     pub found: usize,
     pub expected: usize,
 }
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
-pub enum PacketError {
+pub enum ByteConversionError {
     /// The passed slice is too small. Returns the found and expected minimum size
-    ToBytesSliceTooSmall(SizeMissmatch),
+    ToSliceTooSmall(SizeMissmatch),
     /// The provider buffer it soo small. Returns the found and expected minimum size
-    FromBytesSliceTooSmall(SizeMissmatch),
+    FromSliceTooSmall(SizeMissmatch),
     /// The [zerocopy] library failed to write to bytes
-    ToBytesZeroCopyError,
+    ZeroCopyToError,
-    FromBytesZeroCopyError,
+    ZeroCopyFromError,
 }
 
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Copy, Clone)]
@@ -142,7 +144,7 @@ impl PacketId {
     /// not be set and false will be returned. The maximum allowed value for the 11-bit field is
     /// 2047
     pub fn set_apid(&mut self, apid: u16) -> bool {
-        if apid > 2u16.pow(11) - 1 {
+        if apid > MAX_APID {
             return false;
         }
         self.apid = apid;
@@ -346,7 +348,7 @@ impl SpHeader {
         ssc: u16,
         data_len: u16,
     ) -> Option<Self> {
-        if ssc > 2u16.pow(14) - 1 || apid > 2u16.pow(11) - 1 {
+        if ssc > 2u16.pow(14) - 1 || apid > MAX_APID {
             return None;
         }
         let mut header = SpHeader::default();
@@ -391,15 +393,15 @@ impl SpHeader {
         self.packet_id.ptype = packet_type;
     }
 
-    pub fn from_raw_slice(buf: &[u8]) -> Result<Self, PacketError> {
+    pub fn from_raw_slice(buf: &[u8]) -> Result<Self, ByteConversionError> {
         if buf.len() < CCSDS_HEADER_LEN + 1 {
-            return Err(PacketError::FromBytesSliceTooSmall(SizeMissmatch {
+            return Err(ByteConversionError::FromSliceTooSmall(SizeMissmatch {
                 found: buf.len(),
                 expected: CCSDS_HEADER_LEN + 1,
             }));
         }
         let zc_header = zc::SpHeader::from_bytes(&buf[0..CCSDS_HEADER_LEN])
-            .ok_or(PacketError::FromBytesZeroCopyError)?;
+            .ok_or(ByteConversionError::ZeroCopyFromError)?;
         Ok(Self::from(zc_header))
     }
 }

src/tc.rs

@@ -20,7 +20,7 @@
 //! // Serialize TC into a raw buffer
 //! let mut test_buf: [u8; 32] = [0; 32];
 //! let size = pus_tc
-//!     .write_to(test_buf.as_mut_slice())
+//!     .write_to_bytes(test_buf.as_mut_slice())
 //!     .expect("Error writing TC to buffer");
 //! assert_eq!(size, 13);
 //! println!("{:?}", &test_buf[0..size]);
@@ -36,7 +36,9 @@ use crate::ecss::{
     verify_crc16_from_raw, CrcType, PusError, PusPacket, PusVersion, CRC_CCITT_FALSE,
 };
 use crate::SpHeader;
-use crate::{CcsdsPacket, PacketError, PacketType, SequenceFlags, SizeMissmatch, CCSDS_HEADER_LEN};
+use crate::{
+    ByteConversionError, CcsdsPacket, PacketType, SequenceFlags, SizeMissmatch, CCSDS_HEADER_LEN,
+};
 use core::mem::size_of;
 use delegate::delegate;
 use serde::{Deserialize, Serialize};
@@ -124,7 +126,7 @@ pub mod zc {
     }
 
     impl PusTcSecondaryHeader {
-        pub fn to_bytes(&self, slice: &mut [u8]) -> Option<()> {
+        pub fn write_to_bytes(&self, slice: &mut [u8]) -> Option<()> {
             self.write_to(slice)
         }
 
@@ -328,13 +330,13 @@ impl<'slice> PusTc<'slice> {
     }
 
     /// Write the raw PUS byte representation to a provided buffer.
-    pub fn write_to(&self, slice: &mut [u8]) -> Result<usize, PusError> {
+    pub fn write_to_bytes(&self, slice: &mut [u8]) -> Result<usize, PusError> {
         let mut curr_idx = 0;
         let sph_zc = crate::zc::SpHeader::from(self.sp_header);
         let tc_header_len = size_of::<zc::PusTcSecondaryHeader>();
         let total_size = self.len_packed();
         if total_size > slice.len() {
-            return Err(PusError::PacketError(PacketError::ToBytesSliceTooSmall(
+            return Err(PusError::PacketError(ByteConversionError::ToSliceTooSmall(
                 SizeMissmatch {
                     found: slice.len(),
                     expected: total_size,
@@ -343,13 +345,13 @@ impl<'slice> PusTc<'slice> {
         }
         sph_zc
             .to_bytes(&mut slice[curr_idx..curr_idx + CCSDS_HEADER_LEN])
-            .ok_or(PusError::PacketError(PacketError::ToBytesZeroCopyError))?;
+            .ok_or(PusError::PacketError(ByteConversionError::ZeroCopyToError))?;
 
         curr_idx += CCSDS_HEADER_LEN;
         let sec_header = zc::PusTcSecondaryHeader::try_from(self.sec_header).unwrap();
         sec_header
-            .to_bytes(&mut slice[curr_idx..curr_idx + tc_header_len])
+            .write_to_bytes(&mut slice[curr_idx..curr_idx + tc_header_len])
-            .ok_or(PusError::PacketError(PacketError::ToBytesZeroCopyError))?;
+            .ok_or(PusError::PacketError(ByteConversionError::ZeroCopyToError))?;
 
         curr_idx += tc_header_len;
         if let Some(app_data) = self.app_data {
@@ -408,16 +410,20 @@ impl<'slice> PusTc<'slice> {
         let mut current_idx = 0;
         let sph =
             crate::zc::SpHeader::from_bytes(&slice[current_idx..current_idx + CCSDS_HEADER_LEN])
-                .ok_or(PusError::PacketError(PacketError::FromBytesZeroCopyError))?;
+                .ok_or(PusError::PacketError(
+                    ByteConversionError::ZeroCopyFromError,
+                ))?;
         current_idx += CCSDS_HEADER_LEN;
         let total_len = sph.total_len();
         if raw_data_len < total_len || total_len < PUS_TC_MIN_LEN_WITHOUT_APP_DATA {
             return Err(PusError::RawDataTooShort(raw_data_len));
         }
-        let sec_header = crate::tc::zc::PusTcSecondaryHeader::from_bytes(
+        let sec_header = zc::PusTcSecondaryHeader::from_bytes(
             &slice[current_idx..current_idx + PUC_TC_SECONDARY_HEADER_LEN],
         )
-        .ok_or(PusError::PacketError(PacketError::FromBytesZeroCopyError))?;
+        .ok_or(PusError::PacketError(
+            ByteConversionError::ZeroCopyFromError,
+        ))?;
         current_idx += PUC_TC_SECONDARY_HEADER_LEN;
         let raw_data = &slice[0..total_len];
         let pus_tc = PusTc {
@@ -431,6 +437,10 @@ impl<'slice> PusTc<'slice> {
         verify_crc16_from_raw(raw_data, pus_tc.crc16.expect("CRC16 invalid"))?;
         Ok((pus_tc, total_len))
     }
+
+    pub fn raw(&self) -> Option<&'slice [u8]> {
+        self.raw_data
+    }
 }
 
 //noinspection RsTraitImplementation
@@ -472,8 +482,8 @@ mod tests {
     use crate::ecss::{PusError, PusPacket};
     use crate::tc::ACK_ALL;
     use crate::tc::{PusTc, PusTcSecondaryHeader, PusTcSecondaryHeaderT};
+    use crate::{ByteConversionError, SpHeader};
     use crate::{CcsdsPacket, SequenceFlags};
-    use crate::{PacketError, SpHeader};
     use alloc::vec::Vec;
 
     fn base_ping_tc_full_ctor() -> PusTc<'static> {
@@ -504,7 +514,7 @@ mod tests {
         let pus_tc = base_ping_tc_simple_ctor();
         let mut test_buf: [u8; 32] = [0; 32];
         let size = pus_tc
-            .write_to(test_buf.as_mut_slice())
+            .write_to_bytes(test_buf.as_mut_slice())
             .expect("Error writing TC to buffer");
         assert_eq!(size, 13);
     }
@@ -514,7 +524,7 @@ mod tests {
         let pus_tc = base_ping_tc_simple_ctor();
         let mut test_buf: [u8; 32] = [0; 32];
         let size = pus_tc
-            .write_to(test_buf.as_mut_slice())
+            .write_to_bytes(test_buf.as_mut_slice())
             .expect("Error writing TC to buffer");
         assert_eq!(size, 13);
         let (tc_from_raw, size) = PusTc::new_from_raw_slice(&test_buf)
@@ -540,7 +550,7 @@ mod tests {
         let pus_tc = base_ping_tc_simple_ctor_with_app_data(&[1, 2, 3]);
         let mut test_buf: [u8; 32] = [0; 32];
         let size = pus_tc
-            .write_to(test_buf.as_mut_slice())
+            .write_to_bytes(test_buf.as_mut_slice())
             .expect("Error writing TC to buffer");
         assert_eq!(size, 16);
         let (tc_from_raw, size) = PusTc::new_from_raw_slice(&test_buf)
@@ -571,7 +581,7 @@ mod tests {
         let pus_tc = base_ping_tc_simple_ctor();
         let mut test_buf: [u8; 32] = [0; 32];
         pus_tc
-            .write_to(test_buf.as_mut_slice())
+            .write_to_bytes(test_buf.as_mut_slice())
             .expect("Error writing TC to buffer");
         test_buf[12] = 0;
         let res = PusTc::new_from_raw_slice(&test_buf);
@@ -587,7 +597,7 @@ mod tests {
         let mut test_buf: [u8; 32] = [0; 32];
         pus_tc.calc_own_crc16();
         pus_tc
-            .write_to(test_buf.as_mut_slice())
+            .write_to_bytes(test_buf.as_mut_slice())
             .expect("Error writing TC to buffer");
         verify_test_tc_raw(&test_buf);
         verify_crc_no_app_data(&test_buf);
@@ -598,7 +608,7 @@ mod tests {
         let mut pus_tc = base_ping_tc_simple_ctor();
         pus_tc.calc_crc_on_serialization = false;
         let mut test_buf: [u8; 32] = [0; 32];
-        let res = pus_tc.write_to(test_buf.as_mut_slice());
+        let res = pus_tc.write_to_bytes(test_buf.as_mut_slice());
         assert!(res.is_err());
         let err = res.unwrap_err();
         assert!(matches!(err, PusError::CrcCalculationMissing { .. }));
@@ -622,12 +632,12 @@ mod tests {
     fn test_write_buf_too_msall() {
         let pus_tc = base_ping_tc_simple_ctor();
         let mut test_buf = [0; 12];
-        let res = pus_tc.write_to(test_buf.as_mut_slice());
+        let res = pus_tc.write_to_bytes(test_buf.as_mut_slice());
         assert!(res.is_err());
         let err = res.unwrap_err();
         match err {
             PusError::PacketError(err) => match err {
-                PacketError::ToBytesSliceTooSmall(missmatch) => {
+                ByteConversionError::ToSliceTooSmall(missmatch) => {
                     assert_eq!(missmatch.expected, pus_tc.len_packed());
                     assert_eq!(missmatch.found, 12);
                 }
@@ -643,7 +653,7 @@ mod tests {
         verify_test_tc(&pus_tc, true, 16);
         let mut test_buf: [u8; 32] = [0; 32];
         let size = pus_tc
-            .write_to(test_buf.as_mut_slice())
+            .write_to_bytes(test_buf.as_mut_slice())
             .expect("Error writing TC to buffer");
         assert_eq!(test_buf[11], 1);
         assert_eq!(test_buf[12], 2);
@@ -667,7 +677,7 @@ mod tests {
         assert_eq!(pus_tc.sequence_flags(), SequenceFlags::Unsegmented);
         pus_tc.calc_own_crc16();
         pus_tc
-            .write_to(test_buf.as_mut_slice())
+            .write_to_bytes(test_buf.as_mut_slice())
             .expect("Error writing TC to buffer");
         assert_eq!(test_buf[0], 0x1f);
         assert_eq!(test_buf[1], 0xff);

src/time.rs

@@ -1,5 +1,5 @@
 //! CCSDS Time Code Formats according to [CCSDS 301.0-B-4](https://public.ccsds.org/Pubs/301x0b4e1.pdf)
-use crate::{PacketError, SizeMissmatch};
+use crate::{ByteConversionError, SizeMissmatch};
 use chrono::{DateTime, TimeZone, Utc};
 
 #[allow(unused_imports)]
@@ -38,12 +38,12 @@ impl TryFrom<u8> for CcsdsTimeCodes {
     }
 }
 
-#[derive(Debug, PartialEq, Eq)]
+#[derive(Debug, PartialEq, Eq, Copy, Clone)]
 pub enum TimestampError {
     /// Contains tuple where first value is the expected time code and the second
     /// value is the found raw value
     InvalidTimeCode(CcsdsTimeCodes, u8),
-    OtherPacketError(PacketError),
+    OtherPacketError(ByteConversionError),
 }
 
 #[cfg(feature = "std")]
@@ -71,7 +71,7 @@ pub const fn ccsds_to_unix_days(ccsds_days: i32) -> i32 {
 }
 
 pub trait TimeWriter {
-    fn write_to_bytes(&self, bytes: &mut [u8]) -> Result<(), PacketError>;
+    fn write_to_bytes(&self, bytes: &mut [u8]) -> Result<(), TimestampError>;
 }
 
 pub trait TimeReader {
@@ -94,7 +94,7 @@ pub trait CcsdsTimeProvider {
     fn date_time(&self) -> DateTime<Utc>;
 }
 
-#[derive(Debug, Copy, Clone)]
+#[derive(Debug, Copy, Clone, Default)]
 pub struct CdsShortTimeProvider {
     pfield: u8,
     ccsds_days: u16,
@@ -125,7 +125,7 @@ impl CdsShortTimeProvider {
         let unix_days_seconds = epoch - secs_of_day;
         let ms_of_day = secs_of_day * 1000 + now.subsec_millis() as u64;
         let provider = Self {
-            pfield: (CcsdsTimeCodes::Cds as u8) << 4,
+            pfield: (Cds as u8) << 4,
             ccsds_days: unix_to_ccsds_days((unix_days_seconds / SECONDS_PER_DAY as u64) as i32)
                 as u16,
             ms_of_day: ms_of_day as u32,
@@ -135,6 +135,17 @@ impl CdsShortTimeProvider {
         Ok(provider.setup(unix_days_seconds as i64, ms_of_day))
     }
 
+    #[cfg(feature = "std")]
+    pub fn update_from_now(&mut self) -> Result<(), SystemTimeError> {
+        let now = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH)?;
+        let epoch = now.as_secs();
+        let secs_of_day = epoch % SECONDS_PER_DAY as u64;
+        let unix_days_seconds = epoch - secs_of_day;
+        let ms_of_day = secs_of_day * 1000 + now.subsec_millis() as u64;
+        self.setup(unix_days_seconds as i64, ms_of_day);
+        Ok(())
+    }
+
     fn setup(mut self, unix_days_seconds: i64, ms_of_day: u64) -> Self {
         self.calc_unix_seconds(unix_days_seconds, ms_of_day);
         self.calc_date_time((ms_of_day % 1000) as u32);
@@ -194,12 +205,14 @@ impl CcsdsTimeProvider for CdsShortTimeProvider {
 }
 
 impl TimeWriter for CdsShortTimeProvider {
-    fn write_to_bytes(&self, buf: &mut [u8]) -> Result<(), PacketError> {
+    fn write_to_bytes(&self, buf: &mut [u8]) -> Result<(), TimestampError> {
         if buf.len() < self.len_as_bytes() {
-            return Err(PacketError::ToBytesSliceTooSmall(SizeMissmatch {
+            return Err(TimestampError::OtherPacketError(
-                expected: self.len_as_bytes(),
+                ByteConversionError::ToSliceTooSmall(SizeMissmatch {
-                found: buf.len(),
+                    expected: self.len_as_bytes(),
-            }));
+                    found: buf.len(),
+                }),
+            ));
         }
         buf[0] = self.pfield;
         buf[1..3].copy_from_slice(self.ccsds_days.to_be_bytes().as_slice());
@@ -212,7 +225,7 @@ impl TimeReader for CdsShortTimeProvider {
     fn from_bytes(buf: &[u8]) -> Result<Self, TimestampError> {
         if buf.len() < CDS_SHORT_LEN {
             return Err(TimestampError::OtherPacketError(
-                PacketError::FromBytesSliceTooSmall(SizeMissmatch {
+                ByteConversionError::FromSliceTooSmall(SizeMissmatch {
                     expected: CDS_SHORT_LEN,
                     found: buf.len(),
                 }),
@@ -246,7 +259,7 @@ impl TimeReader for CdsShortTimeProvider {
 mod tests {
     use super::*;
     use crate::time::TimestampError::{InvalidTimeCode, OtherPacketError};
-    use crate::PacketError::{FromBytesSliceTooSmall, ToBytesSliceTooSmall};
+    use crate::ByteConversionError::{FromSliceTooSmall, ToSliceTooSmall};
     use alloc::format;
     use chrono::{Datelike, Timelike};
 
@@ -334,7 +347,7 @@ mod tests {
             let res = time_stamper.write_to_bytes(&mut buf[0..i]);
             assert!(res.is_err());
             match res.unwrap_err() {
-                ToBytesSliceTooSmall(missmatch) => {
+                OtherPacketError(ToSliceTooSmall(missmatch)) => {
                     assert_eq!(missmatch.found, i);
                     assert_eq!(missmatch.expected, 7);
                 }
@@ -357,7 +370,7 @@ mod tests {
                     panic!("Unexpected error");
                 }
                 OtherPacketError(e) => match e {
-                    FromBytesSliceTooSmall(missmatch) => {
+                    FromSliceTooSmall(missmatch) => {
                         assert_eq!(missmatch.found, i);
                         assert_eq!(missmatch.expected, 7);
                     }

src/tm.rs

@@ -5,7 +5,8 @@ use crate::ecss::{
     verify_crc16_from_raw, CrcType, PusError, PusPacket, PusVersion, CRC_CCITT_FALSE,
 };
 use crate::{
-    CcsdsPacket, PacketError, PacketType, SequenceFlags, SizeMissmatch, SpHeader, CCSDS_HEADER_LEN,
+    ByteConversionError, CcsdsPacket, PacketType, SequenceFlags, SizeMissmatch, SpHeader,
+    CCSDS_HEADER_LEN,
 };
 use core::mem::size_of;
 use serde::{Deserialize, Serialize};
@@ -66,7 +67,7 @@ pub mod zc {
     }
 
     impl PusTmSecHeaderWithoutTimestamp {
-        pub fn to_bytes(&self, slice: &mut [u8]) -> Option<()> {
+        pub fn write_to_bytes(&self, slice: &mut [u8]) -> Option<()> {
             self.write_to(slice)
         }
 
@@ -258,6 +259,10 @@ impl<'slice> PusTm<'slice> {
         self.sec_header.time_stamp
     }
 
+    pub fn source_data(&self) -> Option<&'slice [u8]> {
+        self.source_data
+    }
+
     pub fn set_dest_id(&mut self, dest_id: u16) {
         self.sec_header.dest_id = dest_id;
     }
@@ -304,12 +309,12 @@ impl<'slice> PusTm<'slice> {
     }
 
     /// Write the raw PUS byte representation to a provided buffer.
-    pub fn write_to(&self, slice: &mut [u8]) -> Result<usize, PusError> {
+    pub fn write_to_bytes(&self, slice: &mut [u8]) -> Result<usize, PusError> {
         let mut curr_idx = 0;
         let sph_zc = crate::zc::SpHeader::from(self.sp_header);
         let total_size = self.len_packed();
         if total_size > slice.len() {
-            return Err(PusError::PacketError(PacketError::ToBytesSliceTooSmall(
+            return Err(PusError::PacketError(ByteConversionError::ToSliceTooSmall(
                 SizeMissmatch {
                     found: slice.len(),
                     expected: total_size,
@@ -318,14 +323,14 @@ impl<'slice> PusTm<'slice> {
         }
         sph_zc
             .to_bytes(&mut slice[curr_idx..curr_idx + CCSDS_HEADER_LEN])
-            .ok_or(PusError::PacketError(PacketError::ToBytesZeroCopyError))?;
+            .ok_or(PusError::PacketError(ByteConversionError::ZeroCopyToError))?;
 
         curr_idx += CCSDS_HEADER_LEN;
         let sec_header_len = size_of::<zc::PusTmSecHeaderWithoutTimestamp>();
         let sec_header = zc::PusTmSecHeaderWithoutTimestamp::try_from(self.sec_header).unwrap();
         sec_header
-            .to_bytes(&mut slice[curr_idx..curr_idx + sec_header_len])
+            .write_to_bytes(&mut slice[curr_idx..curr_idx + sec_header_len])
-            .ok_or(PusError::PacketError(PacketError::ToBytesZeroCopyError))?;
+            .ok_or(PusError::PacketError(ByteConversionError::ZeroCopyToError))?;
         curr_idx += sec_header_len;
         let timestamp_len = self.sec_header.time_stamp.len();
         slice[curr_idx..curr_idx + timestamp_len].copy_from_slice(self.sec_header.time_stamp);
@@ -394,7 +399,9 @@ impl<'slice> PusTm<'slice> {
         let mut current_idx = 0;
         let sph =
             crate::zc::SpHeader::from_bytes(&slice[current_idx..current_idx + CCSDS_HEADER_LEN])
-                .ok_or(PusError::PacketError(PacketError::FromBytesZeroCopyError))?;
+                .ok_or(PusError::PacketError(
+                    ByteConversionError::ZeroCopyFromError,
+                ))?;
         current_idx += 6;
         let total_len = sph.total_len();
         if raw_data_len < total_len || total_len < PUS_TM_MIN_LEN_WITHOUT_SOURCE_DATA {
@@ -403,7 +410,9 @@ impl<'slice> PusTm<'slice> {
         let sec_header_zc = zc::PusTmSecHeaderWithoutTimestamp::from_bytes(
             &slice[current_idx..current_idx + PUC_TM_MIN_SEC_HEADER_LEN],
         )
-        .ok_or(PusError::PacketError(PacketError::FromBytesZeroCopyError))?;
+        .ok_or(PusError::PacketError(
+            ByteConversionError::ZeroCopyFromError,
+        ))?;
         current_idx += PUC_TM_MIN_SEC_HEADER_LEN;
         let zc_sec_header_wrapper = zc::PusTmSecHeader {
             zc_header: sec_header_zc,
@@ -492,7 +501,9 @@ mod tests {
         let time_stamp = dummy_time_stamp();
         let pus_tm = base_ping_reply_full_ctor(&time_stamp);
         let mut buf: [u8; 32] = [0; 32];
-        let ser_len = pus_tm.write_to(&mut buf).expect("Serialization failed");
+        let ser_len = pus_tm
+            .write_to_bytes(&mut buf)
+            .expect("Serialization failed");
         assert_eq!(ser_len, 22);
         verify_raw_ping_reply(&buf);
     }
@@ -502,7 +513,9 @@ mod tests {
         let src_data = [1, 2, 3];
         let hk_reply = base_hk_reply(dummy_time_stamp(), &src_data);
         let mut buf: [u8; 32] = [0; 32];
-        let ser_len = hk_reply.write_to(&mut buf).expect("Serialization failed");
+        let ser_len = hk_reply
+            .write_to_bytes(&mut buf)
+            .expect("Serialization failed");
         assert_eq!(ser_len, 25);
         assert_eq!(buf[20], 1);
         assert_eq!(buf[21], 2);
@@ -528,7 +541,9 @@ mod tests {
         let time_stamp = dummy_time_stamp();
         let pus_tm = base_ping_reply_full_ctor(&time_stamp);
         let mut buf: [u8; 32] = [0; 32];
-        let ser_len = pus_tm.write_to(&mut buf).expect("Serialization failed");
+        let ser_len = pus_tm
+            .write_to_bytes(&mut buf)
+            .expect("Serialization failed");
         assert_eq!(ser_len, 22);
         let (tm_deserialized, size) =
             PusTm::new_from_raw_slice(&buf, 7).expect("Deserialization failed");
@@ -544,13 +559,13 @@ mod tests {
         tm.calc_crc_on_serialization = false;
         assert_eq!(tm.data_len(), 0x00);
         let mut buf: [u8; 32] = [0; 32];
-        let res = tm.write_to(&mut buf);
+        let res = tm.write_to_bytes(&mut buf);
         assert!(res.is_err());
         assert!(matches!(res.unwrap_err(), PusError::CrcCalculationMissing));
         tm.update_ccsds_data_len();
         assert_eq!(tm.data_len(), 15);
         tm.calc_own_crc16();
-        let res = tm.write_to(&mut buf);
+        let res = tm.write_to_bytes(&mut buf);
         assert!(res.is_ok());
         tm.sp_header.data_len = 0;
         tm.update_packet_fields();
@@ -562,13 +577,13 @@ mod tests {
         let time_stamp = dummy_time_stamp();
         let pus_tm = base_ping_reply_full_ctor(&time_stamp);
         let mut buf: [u8; 16] = [0; 16];
-        let res = pus_tm.write_to(&mut buf);
+        let res = pus_tm.write_to_bytes(&mut buf);
         assert!(res.is_err());
         let error = res.unwrap_err();
         assert!(matches!(error, PusError::PacketError { .. }));
         match error {
             PusError::PacketError(err) => match err {
-                PacketError::ToBytesSliceTooSmall(size_missmatch) => {
+                ByteConversionError::ToSliceTooSmall(size_missmatch) => {
                     assert_eq!(size_missmatch.expected, 22);
                     assert_eq!(size_missmatch.found, 16);
                 }