add PUS A support

CHANGELOG.md

@@ -8,6 +8,21 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 # [unreleased]
 
+## Changed
+
+- `PusVersion::VersionNotSupported` contains raw version number instead of `PusVersion` enum now
+  to make it more flexible.
+- `pus_version` API now returns a `Result<PusVersion, u8>` instead of a `PusVersion` to allow
+  modelling invalid version numbers properly.
+
+## Removed
+
+- `PusVersion::Invalid`, which will be modelled with `Result<PusVersion, u8>` now.
+
+## Added
+
+- Added PUS A legacy support for telecommands inside the `ecss.tc_pus_a` module
+
 # [v0.15.0] 2025-07-18
 
 ## Added
@@ -35,7 +50,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 # [v0.13.1] 2025-03-21
 
-- Bugfix due to operator precendence for `PusTcSecondaryHeader::pus_version`, 
+- 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`
 

src/cfdp/lv.rs

@@ -64,7 +64,7 @@ pub(crate) fn generic_len_check_deserialization(
 
 impl<'data> Lv<'data> {
     #[inline]
-    pub fn new(data: &[u8]) -> Result<Lv, TlvLvDataTooLargeError> {
+    pub fn new(data: &[u8]) -> Result<Lv<'_>, TlvLvDataTooLargeError> {
         if data.len() > u8::MAX as usize {
             return Err(TlvLvDataTooLargeError(data.len()));
         }
@@ -86,7 +86,7 @@ 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, TlvLvDataTooLargeError> {
+    pub fn new_from_str(str_slice: &str) -> Result<Lv<'_>, TlvLvDataTooLargeError> {
         Self::new(str_slice.as_bytes())
     }
 

src/cfdp/pdu/file_data.rs

@@ -201,7 +201,7 @@ impl<'seg_meta, 'file_data> FileDataPdu<'seg_meta, 'file_data> {
             .calc_pdu_datafield_len(self.file_data.len() as u64)
     }
 
-    pub fn segment_metadata(&self) -> Option<&SegmentMetadata> {
+    pub fn segment_metadata(&self) -> Option<&SegmentMetadata<'_>> {
         self.common.segment_metadata.as_ref()
     }
 
@@ -419,8 +419,8 @@ pub fn calculate_max_file_seg_len_for_max_packet_len_and_pdu_header(
     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 let Some(segment_metadata) = segment_metadata {
+        subtract += 1 + segment_metadata.metadata().unwrap().len();
     }
     if pdu_header.common_pdu_conf().file_flag == LargeFileFlag::Large {
         subtract += 8;

src/cfdp/pdu/metadata.rs

@@ -338,11 +338,11 @@ impl<'raw> MetadataPduReader<'raw> {
         &self.metadata_params
     }
 
-    pub fn src_file_name(&self) -> Lv {
+    pub fn src_file_name(&self) -> Lv<'_> {
         self.src_file_name
     }
 
-    pub fn dest_file_name(&self) -> Lv {
+    pub fn dest_file_name(&self) -> Lv<'_> {
         self.dest_file_name
     }
 }

src/cfdp/pdu/nak.rs

@@ -131,7 +131,7 @@ impl<'seg_reqs> NakPduCreator<'seg_reqs> {
         self.end_of_scope
     }
 
-    pub fn segment_requests(&self) -> Option<&SegmentRequests> {
+    pub fn segment_requests(&self) -> Option<&SegmentRequests<'_>> {
         self.segment_requests.as_ref()
     }
 

src/cfdp/tlv/mod.rs

@@ -153,14 +153,17 @@ 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<'_>, TlvLvDataTooLargeError> {
         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<'_>, TlvLvDataTooLargeError> {
         Ok(Tlv {
             tlv_type_field: TlvTypeField::Custom(tlv_type),
             lv: Lv::new(data)?,
@@ -370,7 +373,7 @@ impl EntityIdTlv {
     }
 
     /// Convert to a generic [Tlv], which also erases the programmatic type information.
-    pub fn to_tlv(self, buf: &mut [u8]) -> Result<Tlv, ByteConversionError> {
+    pub fn to_tlv(self, buf: &mut [u8]) -> Result<Tlv<'_>, ByteConversionError> {
         Self::len_check(buf)?;
         self.entity_id
             .write_to_be_bytes(&mut buf[2..2 + self.entity_id.size()])?;

src/ecss/mod.rs

@@ -19,7 +19,9 @@ pub mod event;
 pub mod hk;
 pub mod scheduling;
 pub mod tc;
+pub mod tc_pus_a;
 pub mod tm;
+pub mod tm_pus_a;
 pub mod verification;
 
 pub type CrcType = u16;
@@ -80,18 +82,17 @@ pub enum PusVersion {
     EsaPus = 0,
     PusA = 1,
     PusC = 2,
-    Invalid = 0b1111,
 }
 
 impl TryFrom<u8> for PusVersion {
-    type Error = ();
+    type Error = u8;
 
     fn try_from(value: u8) -> Result<Self, Self::Error> {
         match value {
             x if x == PusVersion::EsaPus as u8 => Ok(PusVersion::EsaPus),
             x if x == PusVersion::PusA as u8 => Ok(PusVersion::PusA),
             x if x == PusVersion::PusC as u8 => Ok(PusVersion::PusC),
-            _ => Err(()),
+            _ => Err(value),
         }
     }
 }
@@ -154,7 +155,7 @@ pub enum PfcReal {
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum PusError {
     #[error("PUS version {0:?} not supported")]
-    VersionNotSupported(PusVersion),
+    VersionNotSupported(u8),
     #[error("checksum verification for crc16 {0:#06x} failed")]
     ChecksumFailure(u16),
     /// CRC16 needs to be calculated first
@@ -167,9 +168,7 @@ pub enum PusError {
 /// Generic trait to describe common attributes for both PUS Telecommands (TC) and PUS Telemetry
 /// (TM) packets. All PUS packets are also a special type of [CcsdsPacket]s.
 pub trait PusPacket: CcsdsPacket {
-    const PUS_VERSION: PusVersion = PusVersion::PusC;
-
-    fn pus_version(&self) -> PusVersion;
+    fn pus_version(&self) -> Result<PusVersion, u8>;
     fn service(&self) -> u8;
     fn subservice(&self) -> u8;
     fn user_data(&self) -> &[u8];
@@ -369,6 +368,7 @@ generic_ecss_enum_typedefs_and_from_impls! {
 /// byte representation. This is especially useful for generic abstractions which depend only
 /// on the serialization of those packets.
 pub trait WritablePusPacket {
+    /// The length here also includes the CRC length.
     fn len_written(&self) -> usize;
 
     /// Writes the packet to the given slice without writing the CRC.
@@ -536,9 +536,9 @@ mod tests {
 
     #[test]
     fn test_pus_error_display() {
-        let unsupport_version = PusError::VersionNotSupported(super::PusVersion::EsaPus);
+        let unsupport_version = PusError::VersionNotSupported(super::PusVersion::EsaPus as u8);
         let write_str = unsupport_version.to_string();
-        assert_eq!(write_str, "PUS version EsaPus not supported")
+        assert_eq!(write_str, "PUS version 0 not supported")
     }
 
     #[test]
@@ -572,8 +572,8 @@ mod tests {
     #[test]
     fn test_pus_error_eq_impl() {
         assert_eq!(
-            PusError::VersionNotSupported(PusVersion::EsaPus),
-            PusError::VersionNotSupported(PusVersion::EsaPus)
+            PusError::VersionNotSupported(PusVersion::EsaPus as u8),
+            PusError::VersionNotSupported(PusVersion::EsaPus as u8)
         );
     }
 

src/ecss/tc.rs

@@ -79,7 +79,7 @@ pub const ACK_ALL: u8 = AckOpts::Acceptance as u8
     | AckOpts::Completion as u8;
 
 pub trait GenericPusTcSecondaryHeader {
-    fn pus_version(&self) -> PusVersion;
+    fn pus_version(&self) -> Result<PusVersion, u8>;
     fn ack_flags(&self) -> u8;
     fn service(&self) -> u8;
     fn subservice(&self) -> u8;
@@ -104,7 +104,7 @@ pub mod zc {
         type Error = PusError;
         fn try_from(value: crate::ecss::tc::PusTcSecondaryHeader) -> Result<Self, Self::Error> {
             if value.version != PusVersion::PusC {
-                return Err(PusError::VersionNotSupported(value.version));
+                return Err(PusError::VersionNotSupported(value.version as u8));
             }
             Ok(PusTcSecondaryHeader {
                 version_ack: ((value.version as u8) << 4) | value.ack,
@@ -117,8 +117,8 @@ 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)
+        fn pus_version(&self) -> Result<PusVersion, u8> {
+            PusVersion::try_from((self.version_ack >> 4) & 0b1111)
         }
 
         #[inline]
@@ -156,8 +156,8 @@ pub struct PusTcSecondaryHeader {
 
 impl GenericPusTcSecondaryHeader for PusTcSecondaryHeader {
     #[inline]
-    fn pus_version(&self) -> PusVersion {
-        self.version
+    fn pus_version(&self) -> Result<PusVersion, u8> {
+        Ok(self.version)
     }
 
     #[inline]
@@ -444,7 +444,7 @@ impl CcsdsPacket for PusTcCreator<'_> {
 impl PusPacket for PusTcCreator<'_> {
     delegate!(to self.sec_header {
         #[inline]
-        fn pus_version(&self) -> PusVersion;
+        fn pus_version(&self) -> Result<PusVersion, u8>;
         #[inline]
         fn service(&self) -> u8;
         #[inline]
@@ -465,7 +465,7 @@ impl PusPacket for PusTcCreator<'_> {
 impl GenericPusTcSecondaryHeader for PusTcCreator<'_> {
     delegate!(to self.sec_header {
         #[inline]
-        fn pus_version(&self) -> PusVersion;
+        fn pus_version(&self) -> Result<PusVersion, u8>;
         #[inline]
         fn service(&self) -> u8;
         #[inline]
@@ -730,7 +730,7 @@ impl CcsdsPacket for PusTcReader<'_> {
 impl PusPacket for PusTcReader<'_> {
     delegate!(to self.sec_header {
         #[inline]
-        fn pus_version(&self) -> PusVersion;
+        fn pus_version(&self) -> Result<PusVersion, u8>;
         #[inline]
         fn service(&self) -> u8;
         #[inline]
@@ -751,7 +751,7 @@ impl PusPacket for PusTcReader<'_> {
 impl GenericPusTcSecondaryHeader for PusTcReader<'_> {
     delegate!(to self.sec_header {
         #[inline]
-        fn pus_version(&self) -> PusVersion;
+        fn pus_version(&self) -> Result<PusVersion, u8>;
         #[inline]
         fn service(&self) -> u8;
         #[inline]
@@ -1157,14 +1157,14 @@ mod tests {
         assert_eq!(PusPacket::subservice(tc), 1);
         assert_eq!(GenericPusTcSecondaryHeader::subservice(tc), 1);
         assert!(tc.sec_header_flag());
-        assert_eq!(PusPacket::pus_version(tc), PusC);
+        assert_eq!(PusPacket::pus_version(tc).unwrap(), PusC);
         assert_eq!(tc.seq_count(), 0x34);
         assert_eq!(tc.source_id(), 0);
         assert_eq!(tc.apid(), 0x02);
         assert_eq!(tc.ack_flags(), ACK_ALL);
-        assert_eq!(PusPacket::pus_version(tc), PusVersion::PusC);
+        assert_eq!(PusPacket::pus_version(tc).unwrap(), PusVersion::PusC);
         assert_eq!(
-            GenericPusTcSecondaryHeader::pus_version(tc),
+            GenericPusTcSecondaryHeader::pus_version(tc).unwrap(),
             PusVersion::PusC
         );
     }

src/ecss/tm.rs

@@ -75,7 +75,7 @@ pub const PUS_TM_MIN_LEN_WITHOUT_SOURCE_DATA: usize =
     CCSDS_HEADER_LEN + PUS_TM_MIN_SEC_HEADER_LEN + size_of::<CrcType>();
 
 pub trait GenericPusTmSecondaryHeader {
-    fn pus_version(&self) -> PusVersion;
+    fn pus_version(&self) -> Result<PusVersion, u8>;
     fn sc_time_ref_status(&self) -> u8;
     fn service(&self) -> u8;
     fn subservice(&self) -> u8;
@@ -107,7 +107,7 @@ pub mod zc {
         type Error = PusError;
         fn try_from(header: crate::ecss::tm::PusTmSecondaryHeader) -> Result<Self, Self::Error> {
             if header.pus_version != PusVersion::PusC {
-                return Err(PusError::VersionNotSupported(header.pus_version));
+                return Err(PusError::VersionNotSupported(header.pus_version as u8));
             }
             Ok(PusTmSecHeaderWithoutTimestamp {
                 pus_version_and_sc_time_ref_status: ((header.pus_version as u8) << 4)
@@ -122,9 +122,8 @@ pub mod zc {
 
     impl GenericPusTmSecondaryHeader for PusTmSecHeaderWithoutTimestamp {
         #[inline]
-        fn pus_version(&self) -> PusVersion {
+        fn pus_version(&self) -> Result<PusVersion, u8> {
             PusVersion::try_from((self.pus_version_and_sc_time_ref_status >> 4) & 0b1111)
-                .unwrap_or(PusVersion::Invalid)
         }
 
         #[inline]
@@ -201,8 +200,8 @@ impl<'stamp> PusTmSecondaryHeader<'stamp> {
 
 impl GenericPusTmSecondaryHeader for PusTmSecondaryHeader<'_> {
     #[inline]
-    fn pus_version(&self) -> PusVersion {
-        self.pus_version
+    fn pus_version(&self) -> Result<PusVersion, u8> {
+        Ok(self.pus_version)
     }
 
     #[inline]
@@ -232,12 +231,16 @@ impl GenericPusTmSecondaryHeader for PusTmSecondaryHeader<'_> {
 }
 
 impl<'slice> TryFrom<zc::PusTmSecHeader<'slice>> for PusTmSecondaryHeader<'slice> {
-    type Error = ();
+    type Error = PusError;
 
     #[inline]
     fn try_from(sec_header: zc::PusTmSecHeader<'slice>) -> Result<Self, Self::Error> {
+        let version = sec_header.zc_header.pus_version();
+        if let Err(e) = version {
+            return Err(PusError::VersionNotSupported(e));
+        }
         Ok(PusTmSecondaryHeader {
-            pus_version: sec_header.zc_header.pus_version(),
+            pus_version: version.unwrap(),
             sc_time_ref_status: sec_header.zc_header.sc_time_ref_status(),
             service: sec_header.zc_header.service(),
             subservice: sec_header.zc_header.subservice(),
@@ -488,9 +491,12 @@ impl CcsdsPacket for PusTmCreator<'_, '_> {
 }
 
 impl PusPacket for PusTmCreator<'_, '_> {
+    #[inline]
+    fn pus_version(&self) -> Result<PusVersion, u8> {
+        Ok(self.sec_header.pus_version)
+    }
+
     delegate!(to self.sec_header {
-        #[inline]
-        fn pus_version(&self) -> PusVersion;
         #[inline]
         fn service(&self) -> u8;
         #[inline]
@@ -511,7 +517,7 @@ impl PusPacket for PusTmCreator<'_, '_> {
 impl GenericPusTmSecondaryHeader for PusTmCreator<'_, '_> {
     delegate!(to self.sec_header {
         #[inline]
-        fn pus_version(&self) -> PusVersion;
+        fn pus_version(&self) -> Result<PusVersion, u8>;
         #[inline]
         fn service(&self) -> u8;
         #[inline]
@@ -797,7 +803,7 @@ impl CcsdsPacket for PusTmReader<'_> {
 impl PusPacket for PusTmReader<'_> {
     delegate!(to self.sec_header {
         #[inline]
-        fn pus_version(&self) -> PusVersion;
+        fn pus_version(&self) -> Result<PusVersion, u8>;
         #[inline]
         fn service(&self) -> u8;
         #[inline]
@@ -818,7 +824,7 @@ impl PusPacket for PusTmReader<'_> {
 impl GenericPusTmSecondaryHeader for PusTmReader<'_> {
     delegate!(to self.sec_header {
         #[inline]
-        fn pus_version(&self) -> PusVersion;
+        fn pus_version(&self) -> Result<PusVersion, u8>;
         #[inline]
         fn service(&self) -> u8;
         #[inline]
@@ -977,7 +983,7 @@ impl CcsdsPacket for PusTmZeroCopyWriter<'_> {
 
 impl PusPacket for PusTmZeroCopyWriter<'_> {
     #[inline]
-    fn pus_version(&self) -> PusVersion {
+    fn pus_version(&self) -> Result<PusVersion, u8> {
         self.sec_header_without_timestamp().pus_version()
     }
 
@@ -1011,7 +1017,7 @@ impl GenericPusTmSecondaryHeader for PusTmZeroCopyWriter<'_> {
     delegate! {
         to self.sec_header_without_timestamp() {
             #[inline]
-            fn pus_version(&self) -> PusVersion;
+            fn pus_version(&self) -> Result<PusVersion, u8>;
             #[inline]
             fn sc_time_ref_status(&self) -> u8;
             #[inline]
@@ -1047,12 +1053,12 @@ mod tests {
 
     const DUMMY_DATA: &[u8] = &[0, 1, 2];
 
-    fn base_ping_reply_full_ctor(timestamp: &[u8]) -> PusTmCreator {
+    fn base_ping_reply_full_ctor<'a, 'b>(timestamp: &'a [u8]) -> PusTmCreator<'a, 'b> {
         let sph = SpHeader::new_for_unseg_tm_checked(0x123, 0x234, 0).unwrap();
         let tm_header = PusTmSecondaryHeader::new_simple(17, 2, timestamp);
         PusTmCreator::new_no_source_data(sph, tm_header, true)
     }
-    fn ping_reply_with_data(timestamp: &[u8]) -> PusTmCreator {
+    fn ping_reply_with_data<'a, 'b>(timestamp: &'a [u8]) -> PusTmCreator<'a, 'b> {
         let sph = SpHeader::new_for_unseg_tm_checked(0x123, 0x234, 0).unwrap();
         let tm_header = PusTmSecondaryHeader::new_simple(17, 2, timestamp);
         PusTmCreator::new(sph, tm_header, DUMMY_DATA, true)
@@ -1442,12 +1448,12 @@ mod tests {
         if has_user_data {
             assert!(!tm.user_data().is_empty());
         }
-        assert_eq!(PusPacket::pus_version(tm), PusC);
+        assert_eq!(PusPacket::pus_version(tm).unwrap(), PusC);
         assert_eq!(tm.apid(), 0x123);
         assert_eq!(tm.seq_count(), 0x234);
-        assert_eq!(PusPacket::pus_version(tm), PusVersion::PusC);
+        assert_eq!(PusPacket::pus_version(tm).unwrap(), PusVersion::PusC);
         assert_eq!(
-            GenericPusTmSecondaryHeader::pus_version(tm),
+            GenericPusTmSecondaryHeader::pus_version(tm).unwrap(),
             PusVersion::PusC
         );
         assert_eq!(tm.data_len(), exp_full_len as u16 - 7);