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added distiction between CCSDS packet and user data

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This commit is contained in:
Robin Müller
2025-11-17 16:14:20 +01:00
committed by Robin Mueller
parent f001234025
commit 3e3f33a7d1
2 changed files with 107 additions and 41 deletions
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10
CHANGELOG.md
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@@ -8,6 +8,16 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
# [unreleased]
## Changed
- Added distinction between `CcsdsPacketReader::user_data` and `CcsdsPacketReader::packet_data`.
- Added distinction between `CcsdsPacketCreatorWithReservedData::user_data` and
`CcsdsPacketCreatorWithReservedData::packet_data`, including mutable variants as well.
## Added
- `checksum` getter for `CcsdsPacketReader`.
# [v0.17.0] 2025-11-06
## Changed

138
src/lib.rs
View File

@@ -1008,9 +1008,21 @@ impl CcsdsPacketCreatorWithReservedData<'_> {
CcsdsPacketIdAndPsc::new_from_ccsds_packet(self)
}
/// Mutable access to the packet data field.
#[inline]
/// Mutable access to the full packet data field.
pub fn packet_data_mut(&mut self) -> &mut [u8] {
let len = self.packet_len();
&mut self.buf[CCSDS_HEADER_LEN..len]
}
/// Read-only access to the full packet data field.
pub fn packet_data(&mut self) -> &[u8] {
let len = self.packet_len();
&self.buf[CCSDS_HEADER_LEN..len]
}
/// Mutable access to the user data field which excludes the optional CRC16.
#[inline]
pub fn user_data_mut(&mut self) -> &mut [u8] {
let len = self.packet_len();
match self.checksum {
Some(ChecksumType::WithCrc16) | Some(ChecksumType::WithCrc16ButIgnored) => {
@@ -1020,9 +1032,9 @@ impl CcsdsPacketCreatorWithReservedData<'_> {
}
}
/// Read-only access to the packet data field.
/// Read-only access to the user data field which excludes the optional CRC16.
#[inline]
pub fn packet_data(&mut self) -> &[u8] {
pub fn user_data(&mut self) -> &[u8] {
let len = self.packet_len();
match self.checksum {
Some(ChecksumType::WithCrc16) | Some(ChecksumType::WithCrc16ButIgnored) => {
@@ -1387,7 +1399,7 @@ impl CcsdsPacket for CcsdsPacketCreator<'_> {
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct CcsdsPacketCreatorOwned {
common: CcsdsPacketCreatorCommon,
packet_data: alloc::vec::Vec<u8>,
user_data: alloc::vec::Vec<u8>,
}
#[cfg(feature = "alloc")]
@@ -1406,14 +1418,14 @@ impl CcsdsPacketCreatorOwned {
pub fn new(
sp_header: SpHeader,
packet_type: PacketType,
packet_data: &[u8],
user_data: &[u8],
checksum: Option<ChecksumType>,
) -> Result<Self, CcsdsPacketCreationError> {
let common =
CcsdsPacketCreatorCommon::new(sp_header, packet_type, packet_data.len(), checksum)?;
CcsdsPacketCreatorCommon::new(sp_header, packet_type, user_data.len(), checksum)?;
Ok(Self {
common,
packet_data: packet_data.to_vec(),
user_data: user_data.to_vec(),
})
}
@@ -1421,12 +1433,12 @@ impl CcsdsPacketCreatorOwned {
pub fn new_with_checksum(
sp_header: SpHeader,
packet_type: PacketType,
packet_data: &[u8],
user_data: &[u8],
) -> Result<Self, CcsdsPacketCreationError> {
Self::new(
sp_header,
packet_type,
packet_data,
user_data,
Some(ChecksumType::WithCrc16),
)
}
@@ -1434,12 +1446,12 @@ impl CcsdsPacketCreatorOwned {
/// Constructor for telemetry which always appends a CRC16 checksum at the packet end.
pub fn new_tm_with_checksum(
sp_header: SpHeader,
packet_data: &[u8],
user_data: &[u8],
) -> Result<Self, CcsdsPacketCreationError> {
Self::new(
sp_header,
PacketType::Tm,
packet_data,
user_data,
Some(ChecksumType::WithCrc16),
)
}
@@ -1447,25 +1459,25 @@ impl CcsdsPacketCreatorOwned {
/// Constructor for telecommands which always appends a CRC16 checksum at the packet end.
pub fn new_tc_with_checksum(
sp_header: SpHeader,
packet_data: &[u8],
user_data: &[u8],
) -> Result<Self, CcsdsPacketCreationError> {
Self::new(
sp_header,
PacketType::Tc,
packet_data,
user_data,
Some(ChecksumType::WithCrc16),
)
}
/// Full length when written to bytes.
pub fn len_written(&self) -> usize {
self.common.len_written(self.packet_data.len())
self.common.len_written(self.user_data.len())
}
/// Write the CCSDS packet to the provided buffer.
pub fn write_to_bytes(&self, buf: &mut [u8]) -> Result<usize, ByteConversionError> {
self.common
.write_to_bytes(buf, self.len_written(), &self.packet_data)
.write_to_bytes(buf, self.len_written(), &self.user_data)
}
/// CCSDS space packet header.
@@ -1483,7 +1495,7 @@ impl CcsdsPacketCreatorOwned {
/// Create a CCSDS packet as a vector.
#[cfg(feature = "alloc")]
pub fn to_vec(&self) -> alloc::vec::Vec<u8> {
self.common.to_vec(self.len_written(), &self.packet_data)
self.common.to_vec(self.len_written(), &self.user_data)
}
}
@@ -1528,12 +1540,19 @@ pub enum CcsdsPacketReadError {
}
/// CCSDS packet reader structure.
///
/// This implementation makes one assumption about the passed data: It allows verifying a
/// CRC16-CCITT checksum at the last two bytes of the packet data field and excluding it from the
/// [Self::packet_data] slice. For that purpose, it makes a distinction between the full
/// [Self::packet_data] including the checksum, and [Self::user_data] which does not include
/// the checksum.
#[derive(Debug)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct CcsdsPacketReader<'buf> {
sp_header: SpHeader,
packet_data: &'buf [u8],
checksum: Option<u16>,
}
impl<'buf> CcsdsPacketReader<'buf> {
@@ -1550,7 +1569,7 @@ impl<'buf> CcsdsPacketReader<'buf> {
/// Generic constructor.
pub fn new(
buf: &'buf [u8],
checksum: Option<ChecksumType>,
checksum_type: Option<ChecksumType>,
) -> Result<Self, CcsdsPacketReadError> {
let sp_header = SpHeader::from_be_bytes(&buf[0..CCSDS_HEADER_LEN])?.0;
if sp_header.packet_len() > buf.len() {
@@ -1560,21 +1579,26 @@ impl<'buf> CcsdsPacketReader<'buf> {
}
.into());
}
let user_data = match checksum {
let checksum = match checksum_type {
Some(ChecksumType::WithCrc16) => {
if CRC_CCITT_FALSE.checksum(&buf[0..sp_header.packet_len()]) != 0 {
return Err(CcsdsPacketReadError::CrcError);
}
&buf[CCSDS_HEADER_LEN..sp_header.packet_len() - 2]
Some(u16::from_be_bytes([
buf[sp_header.packet_len() - 2],
buf[sp_header.packet_len() - 1],
]))
}
Some(ChecksumType::WithCrc16ButIgnored) => {
&buf[CCSDS_HEADER_LEN..sp_header.packet_len() - 2]
}
None => &buf[CCSDS_HEADER_LEN..sp_header.packet_len()],
Some(ChecksumType::WithCrc16ButIgnored) => Some(u16::from_be_bytes([
buf[sp_header.packet_len() - 2],
buf[sp_header.packet_len() - 1],
])),
None => None,
};
Ok(Self {
sp_header,
packet_data: user_data,
packet_data: &buf[CCSDS_HEADER_LEN..sp_header.packet_len()],
checksum,
})
}
}
@@ -1598,12 +1622,27 @@ impl CcsdsPacketReader<'_> {
self.sp_header.packet_id.packet_type
}
/// Read-only access to the packet data field.
/// Read-only access to the full packet data field.
///
/// This might also include the checksum. [Self::user_data] can be used to only retrieve the
/// user data slice without the checksum part.
#[inline]
pub fn packet_data(&self) -> &[u8] {
self.packet_data
}
/// Read-only access to the user data field.
///
/// This is the data without the checksum, if the packet has one.
#[inline]
pub fn user_data(&self) -> &[u8] {
if self.checksum.is_some() {
self.packet_data()[0..self.packet_data().len() - 2].as_ref()
} else {
self.packet_data()
}
}
/// 11-bit Application Process ID field.
#[inline]
pub fn apid(&self) -> u11 {
@@ -1633,6 +1672,12 @@ impl CcsdsPacketReader<'_> {
pub fn data_len(&self) -> u16 {
self.sp_header.data_len()
}
/// Packet checksum if available.
#[inline]
pub fn checksum(&self) -> Option<u16> {
self.checksum
}
}
impl CcsdsPacket for CcsdsPacketReader<'_> {
@@ -2075,8 +2120,12 @@ pub(crate) mod tests {
packet_creator.psc(),
PacketSequenceControl::new(SequenceFlags::Unsegmented, u14::new(0))
);
assert_eq!(packet_creator.packet_data_mut(), &mut [0, 0, 0, 0]);
assert_eq!(packet_creator.packet_data(), &[0, 0, 0, 0]);
assert_eq!(packet_creator.user_data_mut(), &mut [0, 0, 0, 0]);
assert_eq!(packet_creator.user_data(), &[0, 0, 0, 0]);
// Includes the unwritten checksum bytes.
assert_eq!(packet_creator.packet_data_mut(), &mut [0, 0, 0, 0, 0, 0]);
assert_eq!(packet_creator.packet_data(), &[0, 0, 0, 0, 0, 0]);
assert_eq!(packet_creator.user_data(), &[0, 0, 0, 0]);
assert_eq!(packet_creator.ccsds_version(), u3::new(0b000));
}
@@ -2104,8 +2153,8 @@ pub(crate) mod tests {
packet_creator.psc(),
PacketSequenceControl::new(SequenceFlags::Unsegmented, u14::new(0))
);
assert_eq!(packet_creator.packet_data_mut(), &mut [0, 0, 0, 0]);
assert_eq!(packet_creator.packet_data(), &[0, 0, 0, 0]);
assert_eq!(packet_creator.user_data_mut(), &mut [0, 0, 0, 0]);
assert_eq!(packet_creator.user_data(), &[0, 0, 0, 0]);
}
#[test]
@@ -2119,7 +2168,7 @@ pub(crate) mod tests {
&mut buf,
)
.unwrap();
packet_creator.packet_data_mut().copy_from_slice(&data);
packet_creator.user_data_mut().copy_from_slice(&data);
let written_len = packet_creator.finish();
assert_eq!(
CcsdsPacketCreatorWithReservedData::packet_len_for_user_data_with_checksum(4).unwrap(),
@@ -2151,7 +2200,7 @@ pub(crate) mod tests {
Some(ChecksumType::WithCrc16),
)
.unwrap();
packet_creator.packet_data_mut().copy_from_slice(&data);
packet_creator.user_data_mut().copy_from_slice(&data);
let written_len = packet_creator.finish();
assert_eq!(
CcsdsPacketCreatorWithReservedData::packet_len_for_user_data_with_checksum(4).unwrap(),
@@ -2190,6 +2239,7 @@ pub(crate) mod tests {
// Enforced 1 byte packet length.
assert_eq!(reader.packet_data(), &[0]);
assert_eq!(reader.packet_len(), 7);
assert!(reader.checksum().is_none());
}
#[test]
@@ -2204,15 +2254,16 @@ pub(crate) mod tests {
Some(ChecksumType::WithCrc16ButIgnored),
)
.unwrap();
packet_creator.packet_data_mut().copy_from_slice(&data);
packet_creator.user_data_mut().copy_from_slice(&data);
// Special case.
assert_eq!(packet_creator.packet_len(), 13);
packet_creator.finish();
let reader =
CcsdsPacketReader::new(&buf[0..13], Some(ChecksumType::WithCrc16ButIgnored)).unwrap();
// Enforced 1 byte packet length.
assert_eq!(reader.packet_data(), &data);
assert_eq!(reader.user_data(), &data);
assert_eq!(reader.packet_len(), 13);
assert!(reader.checksum().is_some());
}
#[test]
@@ -2245,7 +2296,7 @@ pub(crate) mod tests {
&mut buf,
)
.unwrap();
packet_creator.packet_data_mut().copy_from_slice(&data);
packet_creator.user_data_mut().copy_from_slice(&data);
let written_len = packet_creator.finish();
assert_eq!(
CcsdsPacketCreatorWithReservedData::packet_len_for_user_data_with_checksum(4).unwrap(),
@@ -2276,7 +2327,7 @@ pub(crate) mod tests {
&mut buf,
)
.unwrap();
packet_creator.packet_data_mut().copy_from_slice(&data);
packet_creator.user_data_mut().copy_from_slice(&data);
let written_len = packet_creator.finish();
assert_eq!(
CcsdsPacketCreatorWithReservedData::packet_len_for_user_data_with_checksum(4).unwrap(),
@@ -2310,7 +2361,7 @@ pub(crate) mod tests {
)
.unwrap();
let sph = *packet_creator.sp_header();
packet_creator.packet_data_mut().copy_from_slice(&data);
packet_creator.user_data_mut().copy_from_slice(&data);
assert_eq!(
packet_creator.ccsds_packet_id_and_psc(),
CcsdsPacketIdAndPsc::from(sph)
@@ -2415,7 +2466,7 @@ pub(crate) mod tests {
.to_vec();
let reader =
CcsdsPacketReader::new(&packet_raw, Some(ChecksumType::WithCrc16ButIgnored)).unwrap();
assert_eq!(reader.packet_data(), data);
assert_eq!(reader.user_data(), data);
}
fn generic_test_creator(packet_raw: &[u8], sp_header: &SpHeader, packet_type: PacketType) {
@@ -2482,7 +2533,7 @@ pub(crate) mod tests {
}
fn generic_ccsds_reader_test(
packet_data: &[u8],
user_data: &[u8],
packet_raw: &[u8],
packet_type: PacketType,
sp_header: SpHeader,
@@ -2493,7 +2544,11 @@ pub(crate) mod tests {
);
let reader = CcsdsPacketReader::new_with_checksum(packet_raw).unwrap();
assert_eq!(*reader.sp_header(), sp_header);
assert_eq!(reader.packet_data(), packet_data);
assert_eq!(
&reader.packet_data()[0..reader.packet_data().len() - 2],
user_data
);
assert_eq!(reader.user_data(), user_data);
assert_eq!(reader.apid(), u11::new(0x1));
assert_eq!(
reader.packet_id(),
@@ -2506,6 +2561,7 @@ pub(crate) mod tests {
assert_eq!(reader.packet_len(), packet_raw.len());
assert_eq!(reader.packet_type(), packet_type);
assert_eq!(reader.data_len() as usize, packet_raw.len() - 7);
assert!(reader.checksum().is_some());
}
#[test]
@@ -2704,7 +2760,7 @@ pub(crate) mod tests {
*packet_raw.last_mut().unwrap() = 0;
let reader =
CcsdsPacketReader::new(&packet_raw, Some(ChecksumType::WithCrc16ButIgnored)).unwrap();
assert_eq!(reader.packet_data(), data);
assert_eq!(reader.user_data(), data);
}
#[test]