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added first PusTm impl

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Robin Müller 2022-07-31 02:27:27 +02:00
parent 776f599e08
commit b7f3ec424c
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GPG Key ID: 71B58F8A3CDFA9AC
4 changed files with 397 additions and 127 deletions
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54
src/ecss.rs
View File

@ -3,6 +3,8 @@ use core::mem::size_of;
use crc::{Crc, CRC_16_IBM_3740};
use serde::{Deserialize, Serialize};
pub type CrcType = u16;
/// CRC algorithm used by the PUS standard
pub const CRC_CCITT_FALSE: Crc<u16> = Crc::<u16>::new(&CRC_16_IBM_3740);
pub const CCSDS_HEADER_LEN: usize = size_of::<crate::zc::SpHeader>();
@ -13,6 +15,20 @@ pub enum PusVersion {
EsaPus = 0,
PusA = 1,
PusC = 2,
Invalid = 0b1111,
}
impl TryFrom<u8> for PusVersion {
type Error = ();
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(()),
}
}
}
#[derive(Debug, Copy, Clone, PartialEq)]
@ -29,9 +45,47 @@ pub enum PusError {
pub trait PusPacket: CcsdsPacket {
const PUS_VERSION: PusVersion = PusVersion::PusC;
fn pus_version(&self) -> PusVersion;
fn service(&self) -> u8;
fn subservice(&self) -> u8;
fn user_data(&self) -> Option<&[u8]>;
fn crc16(&self) -> Option<u16>;
}
pub(crate) fn crc_from_raw_data(raw_data: Option<&[u8]>) -> Result<u16, PusError> {
if let Some(raw_data) = raw_data {
if raw_data.len() < 2 {
return Err(PusError::RawDataTooShort(raw_data.len()));
}
return Ok(u16::from_be_bytes(
raw_data[raw_data.len() - 2..raw_data.len()]
.try_into()
.unwrap(),
));
}
Err(PusError::NoRawData)
}
pub(crate) fn calc_pus_crc16(bytes: &[u8]) -> u16 {
let mut digest = CRC_CCITT_FALSE.digest();
digest.update(bytes);
digest.finalize()
}
pub(crate) fn crc_procedure(
calc_on_serialization: bool,
cached_crc16: &Option<u16>,
curr_idx: usize,
slice: &[u8],
) -> Result<u16, PusError> {
let crc16;
if calc_on_serialization {
crc16 = calc_pus_crc16(&slice[0..curr_idx])
} else if cached_crc16.is_none() {
return Err(PusError::CrcCalculationMissing);
} else {
crc16 = cached_crc16.unwrap();
}
Ok(crc16)
}

226
src/tc.rs
View File

@ -1,4 +1,6 @@
use crate::ecss::{PusError, PusPacket, PusVersion, CRC_CCITT_FALSE};
use crate::ecss::{
crc_from_raw_data, crc_procedure, CrcType, PusError, PusPacket, PusVersion, CRC_CCITT_FALSE,
};
use crate::ser::SpHeader;
use crate::{CcsdsPacket, PacketError, PacketType, SequenceFlags, SizeMissmatch, CCSDS_HEADER_LEN};
use alloc::vec::Vec;
@ -7,10 +9,8 @@ use delegate::delegate;
use serde::{Deserialize, Serialize};
use zerocopy::AsBytes;
type CrcType = u16;
/// PUS C secondary header length is fixed
pub const PUC_TC_SECONDARY_HEADER_LEN: usize = size_of::<zc::PusTcDataFieldHeader>();
pub const PUC_TC_SECONDARY_HEADER_LEN: usize = size_of::<zc::PusTcSecondaryHeader>();
pub const PUS_TC_MIN_LEN_WITHOUT_APP_DATA: usize =
CCSDS_HEADER_LEN + PUC_TC_SECONDARY_HEADER_LEN + size_of::<CrcType>();
const PUS_VERSION: PusVersion = PusVersion::PusC;
@ -28,7 +28,8 @@ pub const ACK_ALL: u8 = AckOpts::Acceptance as u8
| AckOpts::Progress as u8
| AckOpts::Completion as u8;
pub trait PusTcSecondaryHeader {
pub trait PusTcSecondaryHeaderT {
fn pus_version(&self) -> PusVersion;
fn ack_flags(&self) -> u8;
fn service(&self) -> u8;
fn subservice(&self) -> u8;
@ -37,25 +38,25 @@ pub trait PusTcSecondaryHeader {
pub mod zc {
use crate::ecss::{PusError, PusVersion};
use crate::tc::PusTcSecondaryHeader;
use crate::tc::PusTcSecondaryHeaderT;
use zerocopy::{AsBytes, FromBytes, NetworkEndian, Unaligned, U16};
#[derive(FromBytes, AsBytes, Unaligned)]
#[repr(C)]
pub struct PusTcDataFieldHeader {
pub struct PusTcSecondaryHeader {
version_ack: u8,
service: u8,
subservice: u8,
source_id: U16<NetworkEndian>,
}
impl TryFrom<crate::tc::PusTcDataFieldHeader> for PusTcDataFieldHeader {
impl TryFrom<crate::tc::PusTcSecondaryHeader> for PusTcSecondaryHeader {
type Error = PusError;
fn try_from(value: crate::tc::PusTcDataFieldHeader) -> Result<Self, Self::Error> {
fn try_from(value: crate::tc::PusTcSecondaryHeader) -> Result<Self, Self::Error> {
if value.version != PusVersion::PusC {
return Err(PusError::VersionNotSupported(value.version));
}
Ok(PusTcDataFieldHeader {
Ok(PusTcSecondaryHeader {
version_ack: ((value.version as u8) << 4) | value.ack,
service: value.service,
subservice: value.subservice,
@ -64,7 +65,11 @@ pub mod zc {
}
}
impl PusTcSecondaryHeader for PusTcDataFieldHeader {
impl PusTcSecondaryHeaderT for PusTcSecondaryHeader {
fn pus_version(&self) -> PusVersion {
PusVersion::try_from(self.version_ack >> 4 & 0b1111).unwrap_or(PusVersion::Invalid)
}
fn ack_flags(&self) -> u8 {
self.version_ack & 0b1111
}
@ -82,19 +87,19 @@ pub mod zc {
}
}
impl PusTcDataFieldHeader {
pub fn to_bytes(&self, slice: &mut (impl AsMut<[u8]> + ?Sized)) -> Option<()> {
self.write_to(slice.as_mut())
impl PusTcSecondaryHeader {
pub fn to_bytes(&self, slice: &mut [u8]) -> Option<()> {
self.write_to(slice)
}
pub fn from_bytes(slice: &(impl AsRef<[u8]> + ?Sized)) -> Option<Self> {
Self::read_from(slice.as_ref())
pub fn from_bytes(slice: &[u8]) -> Option<Self> {
Self::read_from(slice)
}
}
}
#[derive(PartialEq, Copy, Clone, Serialize, Deserialize, Debug)]
pub struct PusTcDataFieldHeader {
pub struct PusTcSecondaryHeader {
pub service: u8,
pub subservice: u8,
pub source_id: u16,
@ -102,7 +107,11 @@ pub struct PusTcDataFieldHeader {
pub version: PusVersion,
}
impl PusTcSecondaryHeader for PusTcDataFieldHeader {
impl PusTcSecondaryHeaderT for PusTcSecondaryHeader {
fn pus_version(&self) -> PusVersion {
self.version
}
fn ack_flags(&self) -> u8 {
self.ack
}
@ -119,11 +128,12 @@ impl PusTcSecondaryHeader for PusTcDataFieldHeader {
self.source_id
}
}
impl TryFrom<zc::PusTcDataFieldHeader> for PusTcDataFieldHeader {
impl TryFrom<zc::PusTcSecondaryHeader> for PusTcSecondaryHeader {
type Error = ();
fn try_from(value: zc::PusTcDataFieldHeader) -> Result<Self, Self::Error> {
Ok(PusTcDataFieldHeader {
fn try_from(value: zc::PusTcSecondaryHeader) -> Result<Self, Self::Error> {
Ok(PusTcSecondaryHeader {
service: value.service(),
subservice: value.subservice(),
source_id: value.source_id(),
@ -133,9 +143,9 @@ impl TryFrom<zc::PusTcDataFieldHeader> for PusTcDataFieldHeader {
}
}
impl PusTcDataFieldHeader {
impl PusTcSecondaryHeader {
pub fn new_simple(service: u8, subservice: u8) -> Self {
PusTcDataFieldHeader {
PusTcSecondaryHeader {
service,
subservice,
ack: ACK_ALL,
@ -145,7 +155,7 @@ impl PusTcDataFieldHeader {
}
pub fn new(service: u8, subservice: u8, ack: u8, source_id: u16) -> Self {
PusTcDataFieldHeader {
PusTcSecondaryHeader {
service,
subservice,
ack: ack & 0b1111,
@ -155,17 +165,16 @@ impl PusTcDataFieldHeader {
}
}
/// This struct models a PUS telecommand and which can also be used. It is the primary data
/// structure to generate the raw byte representation of a PUS telecommand or to
/// deserialize from one from raw bytes.
/// This struct models a PUS telecommand. It is the primary data structure to generate the raw byte
/// representation of a PUS telecommand or to deserialize from one from raw bytes.
///
/// There is no spare bytes support.
/// There is no spare bytes support yet
#[derive(PartialEq, Copy, Clone, Serialize, Deserialize, Debug)]
pub struct PusTc<'slice> {
pub sph: SpHeader,
pub data_field_header: PusTcDataFieldHeader,
/// If this is set to false, a manual call to [PusTc::calc_own_crc16] is necessary for the
/// serialized or cached CRC16 to be valid.
pub sp_header: SpHeader,
pub sec_header: PusTcSecondaryHeader,
/// If this is set to false, a manual call to [PusTc::calc_own_crc16] or
/// [PusTc::update_packet_fields] is necessary for the serialized or cached CRC16 to be valid.
pub calc_crc_on_serialization: bool,
#[serde(skip)]
raw_data: Option<&'slice [u8]>,
@ -178,26 +187,26 @@ impl<'slice> PusTc<'slice> {
///
/// # Arguments
///
/// * `sph` - Space packet header information. The correct packet type will be set
/// * `sp_header` - Space packet header information. The correct packet type will be set
/// automatically
/// * `pus_params` - Information contained in the data field header, including the service
/// * `sec_header` - Information contained in the data field header, including the service
/// and subservice type
/// * `app_data` - Custom application data
/// * `set_ccsds_len` - Can be used to automatically update the CCSDS space packet data length
/// field. If this is not set to true, [PusTc::update_ccsds_data_len] can be called to set
/// the correct value to this field manually
/// * `app_data` - Custom application data
pub fn new(
sph: &mut SpHeader,
pus_params: PusTcDataFieldHeader,
sp_header: &mut SpHeader,
sec_header: PusTcSecondaryHeader,
app_data: Option<&'slice [u8]>,
set_ccsds_len: bool,
) -> Self {
sph.packet_id.ptype = PacketType::Tc;
sp_header.packet_id.ptype = PacketType::Tc;
let mut pus_tc = PusTc {
sph: *sph,
sp_header: *sp_header,
raw_data: None,
app_data,
data_field_header: pus_params,
sec_header,
calc_crc_on_serialization: true,
crc16: None,
};
@ -218,7 +227,7 @@ impl<'slice> PusTc<'slice> {
) -> Self {
Self::new(
sph,
PusTcDataFieldHeader::new(service, subservice, ACK_ALL, 0),
PusTcSecondaryHeader::new(service, subservice, ACK_ALL, 0),
app_data,
set_ccsds_len,
)
@ -233,61 +242,48 @@ impl<'slice> PusTc<'slice> {
}
pub fn set_seq_flags(&mut self, seq_flag: SequenceFlags) {
self.sph.psc.seq_flags = seq_flag;
self.sp_header.psc.seq_flags = seq_flag;
}
pub fn set_ack_field(&mut self, ack: u8) -> bool {
if ack > 0b1111 {
return false;
}
self.data_field_header.ack = ack & 0b1111;
self.sec_header.ack = ack & 0b1111;
true
}
pub fn set_source_id(&mut self, source_id: u16) {
self.data_field_header.source_id = source_id;
self.sec_header.source_id = source_id;
}
/// Forwards the call to [crate::PacketId::set_apid]
pub fn set_apid(&mut self, apid: u16) -> bool {
self.sph.packet_id.set_apid(apid)
self.sp_header.packet_id.set_apid(apid)
}
/// Forwards the call to [crate::PacketSequenceCtrl::set_seq_count]
pub fn set_seq_count(&mut self, seq_count: u16) -> bool {
self.sph.psc.set_seq_count(seq_count)
self.sp_header.psc.set_seq_count(seq_count)
}
/// Calculate the CCSDS space packet data length field and sets it
/// This is called automatically if the [set_ccsds_len] argument in the [new] call was used.
/// If this was not done or the application data is set or changed after construction,
/// this function needs to be called to ensure that the data length field of the CCSDS header
/// is set correctly
pub fn update_ccsds_data_len(&mut self) {
self.sph.data_len = self.len_packed() as u16 - size_of::<crate::zc::SpHeader>() as u16 - 1;
}
fn crc_from_raw_data(&self) -> Result<u16, PusError> {
if let Some(raw_data) = self.raw_data {
if raw_data.len() < 2 {
return Err(PusError::RawDataTooShort(raw_data.len()));
}
return Ok(u16::from_be_bytes(
raw_data[raw_data.len() - 2..raw_data.len()]
.try_into()
.unwrap(),
));
}
Err(PusError::NoRawData)
}
pub fn calc_crc16(bytes: &[u8]) -> u16 {
let mut digest = CRC_CCITT_FALSE.digest();
digest.update(bytes);
digest.finalize()
self.sp_header.data_len =
self.len_packed() as u16 - size_of::<crate::zc::SpHeader>() as u16 - 1;
}
/// This function should be called before the TC packet is serialized if
/// [calc_crc_on_serialization] is set to False. It will calculate and cache the CRC16.
pub fn calc_own_crc16(&mut self) {
let mut digest = CRC_CCITT_FALSE.digest();
let sph_zc = crate::zc::SpHeader::from(self.sph);
let sph_zc = crate::zc::SpHeader::from(self.sp_header);
digest.update(sph_zc.as_bytes());
let pus_tc_header = zc::PusTcDataFieldHeader::try_from(self.data_field_header).unwrap();
let pus_tc_header = zc::PusTcSecondaryHeader::try_from(self.sec_header).unwrap();
digest.update(pus_tc_header.as_bytes());
if let Some(app_data) = self.app_data {
digest.update(app_data);
@ -295,22 +291,17 @@ impl<'slice> PusTc<'slice> {
self.crc16 = Some(digest.finalize())
}
/// This function updates two important internal fields: The CCSDS packet length in the
/// space packet header and the CRC16 field. This function should be called before
/// the TC packet is serialized
/// This helper function calls both [update_ccsds_data_len] and [calc_own_crc16]
pub fn update_packet_fields(&mut self) {
self.update_ccsds_data_len();
self.calc_own_crc16();
}
pub fn copy_to_buf(&self, slice: &mut [u8]) -> Result<usize, PusError> {
pub fn write_to(&self, slice: &mut [u8]) -> Result<usize, PusError> {
let mut curr_idx = 0;
let sph_zc = crate::zc::SpHeader::from(self.sph);
let tc_header_len = size_of::<zc::PusTcDataFieldHeader>();
let mut total_size = PUS_TC_MIN_LEN_WITHOUT_APP_DATA;
if let Some(app_data) = self.app_data {
total_size += app_data.len();
};
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::OtherPacketError(
PacketError::ToBytesSliceTooSmall(SizeMissmatch {
@ -324,35 +315,28 @@ impl<'slice> PusTc<'slice> {
.ok_or(PusError::OtherPacketError(
PacketError::ToBytesZeroCopyError,
))?;
curr_idx += 6;
// The PUS version is hardcoded to PUS C
let pus_tc_header = zc::PusTcDataFieldHeader::try_from(self.data_field_header).unwrap();
pus_tc_header
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])
.ok_or(PusError::OtherPacketError(
PacketError::ToBytesZeroCopyError,
))?;
curr_idx += tc_header_len;
if let Some(app_data) = self.app_data {
slice[curr_idx..curr_idx + app_data.len()].copy_from_slice(app_data);
curr_idx += app_data.len();
}
let crc16;
if self.calc_crc_on_serialization {
crc16 = Self::calc_crc16(&slice[0..curr_idx])
} else if self.crc16.is_none() {
return Err(PusError::CrcCalculationMissing);
} else {
crc16 = self.crc16.unwrap();
}
let crc16 = crc_procedure(self.calc_crc_on_serialization, &self.crc16, curr_idx, slice)?;
slice[curr_idx..curr_idx + 2].copy_from_slice(crc16.to_be_bytes().as_slice());
curr_idx += 2;
Ok(curr_idx)
}
pub fn append_to_vec(&self, vec: &mut Vec<u8>) -> Result<usize, PusError> {
let sph_zc = crate::zc::SpHeader::from(self.sph);
let sph_zc = crate::zc::SpHeader::from(self.sp_header);
let mut appended_len = PUS_TC_MIN_LEN_WITHOUT_APP_DATA;
if let Some(app_data) = self.app_data {
appended_len += app_data.len();
@ -362,21 +346,19 @@ impl<'slice> PusTc<'slice> {
vec.extend_from_slice(sph_zc.as_bytes());
curr_idx += sph_zc.as_bytes().len();
// The PUS version is hardcoded to PUS C
let pus_tc_header = zc::PusTcDataFieldHeader::try_from(self.data_field_header).unwrap();
let pus_tc_header = zc::PusTcSecondaryHeader::try_from(self.sec_header).unwrap();
vec.extend_from_slice(pus_tc_header.as_bytes());
curr_idx += pus_tc_header.as_bytes().len();
if let Some(app_data) = self.app_data {
vec.extend_from_slice(app_data);
curr_idx += app_data.len();
}
let crc16;
if self.calc_crc_on_serialization {
crc16 = Self::calc_crc16(&vec[start_idx..curr_idx])
} else if self.crc16.is_none() {
return Err(PusError::CrcCalculationMissing);
} else {
crc16 = self.crc16.unwrap();
}
let crc16 = crc_procedure(
self.calc_crc_on_serialization,
&self.crc16,
curr_idx,
&vec[start_idx..curr_idx],
)?;
vec.extend_from_slice(crc16.to_be_bytes().as_slice());
Ok(appended_len)
}
@ -400,7 +382,7 @@ impl<'slice> PusTc<'slice> {
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::PusTcDataFieldHeader::from_bytes(
let sec_header = crate::tc::zc::PusTcSecondaryHeader::from_bytes(
&slice_ref[current_idx..current_idx + PUC_TC_SECONDARY_HEADER_LEN],
)
.ok_or(PusError::OtherPacketError(
@ -408,8 +390,8 @@ impl<'slice> PusTc<'slice> {
))?;
current_idx += PUC_TC_SECONDARY_HEADER_LEN;
let mut pus_tc = PusTc {
sph: SpHeader::from(sph),
data_field_header: PusTcDataFieldHeader::try_from(sec_header).unwrap(),
sp_header: SpHeader::from(sph),
sec_header: PusTcSecondaryHeader::try_from(sec_header).unwrap(),
raw_data: Some(slice_ref),
app_data: match current_idx {
_ if current_idx == total_len - 2 => None,
@ -421,7 +403,7 @@ impl<'slice> PusTc<'slice> {
calc_crc_on_serialization: false,
crc16: None,
};
pus_tc.crc_from_raw_data()?;
crc_from_raw_data(pus_tc.raw_data)?;
pus_tc.verify()?;
Ok((pus_tc, total_len))
}
@ -436,14 +418,14 @@ impl<'slice> PusTc<'slice> {
if digest.finalize() == 0 {
return Ok(());
}
let crc16 = self.crc_from_raw_data()?;
let crc16 = crc_from_raw_data(self.raw_data)?;
Err(PusError::IncorrectCrc(crc16))
}
}
//noinspection RsTraitImplementation
impl CcsdsPacket for PusTc<'_> {
delegate!(to self.sph {
delegate!(to self.sp_header {
fn ccsds_version(&self) -> u8;
fn packet_id(&self) -> crate::PacketId;
fn psc(&self) -> crate::PacketSequenceCtrl;
@ -453,7 +435,8 @@ impl CcsdsPacket for PusTc<'_> {
//noinspection RsTraitImplementation
impl PusPacket for PusTc<'_> {
delegate!(to self.data_field_header {
delegate!(to self.sec_header {
fn pus_version(&self) -> PusVersion;
fn service(&self) -> u8;
fn subservice(&self) -> u8;
});
@ -468,8 +451,9 @@ impl PusPacket for PusTc<'_> {
}
//noinspection RsTraitImplementation
impl PusTcSecondaryHeader for PusTc<'_> {
delegate!(to self.data_field_header {
impl PusTcSecondaryHeaderT for PusTc<'_> {
delegate!(to self.sec_header {
fn pus_version(&self) -> PusVersion;
fn service(&self) -> u8;
fn subservice(&self) -> u8;
fn source_id(&self) -> u16;
@ -479,16 +463,17 @@ impl PusTcSecondaryHeader for PusTc<'_> {
#[cfg(test)]
mod tests {
use crate::ecss::PusVersion::PusC;
use crate::ecss::{PusError, PusPacket};
use crate::ser::SpHeader;
use crate::tc::ACK_ALL;
use crate::tc::{PusTc, PusTcDataFieldHeader, PusTcSecondaryHeader};
use crate::tc::{PusTc, PusTcSecondaryHeader, PusTcSecondaryHeaderT};
use crate::{CcsdsPacket, SequenceFlags};
use alloc::vec::Vec;
fn base_ping_tc_full_ctor() -> PusTc<'static> {
let mut sph = SpHeader::tc(0x02, 0x34, 0).unwrap();
let tc_header = PusTcDataFieldHeader::new_simple(17, 1);
let tc_header = PusTcSecondaryHeader::new_simple(17, 1);
PusTc::new(&mut sph, tc_header, None, true)
}
@ -514,7 +499,7 @@ mod tests {
let pus_tc = base_ping_tc_simple_ctor();
let mut test_buf: [u8; 32] = [0; 32];
let size = pus_tc
.copy_to_buf(test_buf.as_mut_slice())
.write_to(test_buf.as_mut_slice())
.expect("Error writing TC to buffer");
assert_eq!(size, 13);
}
@ -523,7 +508,7 @@ mod tests {
let pus_tc = base_ping_tc_simple_ctor();
let mut test_buf: [u8; 32] = [0; 32];
let size = pus_tc
.copy_to_buf(test_buf.as_mut_slice())
.write_to(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)
@ -551,7 +536,7 @@ mod tests {
let pus_tc = base_ping_tc_simple_ctor();
let mut test_buf: [u8; 32] = [0; 32];
pus_tc
.copy_to_buf(test_buf.as_mut_slice())
.write_to(test_buf.as_mut_slice())
.expect("Error writing TC to buffer");
test_buf[12] = 0;
let res = PusTc::new_from_raw_slice(&test_buf);
@ -567,7 +552,7 @@ mod tests {
let mut test_buf: [u8; 32] = [0; 32];
pus_tc.calc_own_crc16();
pus_tc
.copy_to_buf(test_buf.as_mut_slice())
.write_to(test_buf.as_mut_slice())
.expect("Error writing TC to buffer");
verify_test_tc_raw(&test_buf);
verify_crc_no_app_data(&test_buf);
@ -578,7 +563,7 @@ 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.copy_to_buf(test_buf.as_mut_slice());
let res = pus_tc.write_to(test_buf.as_mut_slice());
assert!(res.is_err());
let err = res.unwrap_err();
assert!(matches!(err, PusError::CrcCalculationMissing { .. }));
@ -604,7 +589,7 @@ mod tests {
verify_test_tc(&pus_tc, true, 16);
let mut test_buf: [u8; 32] = [0; 32];
let size = pus_tc
.copy_to_buf(test_buf.as_mut_slice())
.write_to(test_buf.as_mut_slice())
.expect("Error writing TC to buffer");
assert_eq!(test_buf[11], 1);
assert_eq!(test_buf[12], 2);
@ -628,7 +613,7 @@ mod tests {
assert_eq!(pus_tc.sequence_flags(), SequenceFlags::Unsegmented);
pus_tc.calc_own_crc16();
pus_tc
.copy_to_buf(test_buf.as_mut_slice())
.write_to(test_buf.as_mut_slice())
.expect("Error writing TC to buffer");
assert_eq!(test_buf[0], 0x1f);
assert_eq!(test_buf[1], 0xff);
@ -643,6 +628,7 @@ mod tests {
fn verify_test_tc(tc: &PusTc, has_user_data: bool, exp_full_len: usize) {
assert_eq!(PusPacket::service(tc), 17);
assert_eq!(PusPacket::subservice(tc), 1);
assert_eq!(PusPacket::pus_version(tc), PusC);
if !has_user_data {
assert_eq!(tc.user_data(), None);
}
@ -652,7 +638,7 @@ mod tests {
assert_eq!(tc.ack_flags(), ACK_ALL);
assert_eq!(tc.len_packed(), exp_full_len);
assert_eq!(
tc.sph,
tc.sp_header,
SpHeader::tc(0x02, 0x34, exp_full_len as u16 - 7).unwrap()
);
}

14
src/time.rs
View File

@ -60,19 +60,19 @@ pub const fn ccsds_to_unix_days(ccsds_days: i32) -> i32 {
ccsds_days + DAYS_CCSDS_TO_UNIX
}
trait TimeWriter {
pub trait TimeWriter {
fn write_to_bytes(&self, bytes: &mut [u8]) -> Result<(), PacketError>;
}
trait TimeReader {
pub trait TimeReader {
fn from_bytes(buf: &[u8]) -> Result<Self, TimestampError>
where
Self: Sized;
}
/// Trait for generic CCSDS time providers
trait CcsdsTimeProvider {
fn len(&self) -> usize;
pub trait CcsdsTimeProvider {
fn len_as_bytes(&self) -> usize;
/// Returns the pfield of the time provider. The pfield can have one or two bytes depending
/// on the extension bit (first bit). The time provider should returns a tuple where the first
@ -162,7 +162,7 @@ impl CdsShortTimeProvider {
}
impl CcsdsTimeProvider for CdsShortTimeProvider {
fn len(&self) -> usize {
fn len_as_bytes(&self) -> usize {
CDS_SHORT_LEN
}
@ -185,9 +185,9 @@ impl CcsdsTimeProvider for CdsShortTimeProvider {
impl TimeWriter for CdsShortTimeProvider {
fn write_to_bytes(&self, buf: &mut [u8]) -> Result<(), PacketError> {
if buf.len() < self.len() {
if buf.len() < self.len_as_bytes() {
return Err(PacketError::ToBytesSliceTooSmall(SizeMissmatch {
expected: self.len(),
expected: self.len_as_bytes(),
found: buf.len(),
}));
}

230
src/tm.rs
View File

@ -1 +1,231 @@
use crate::ecss::{crc_procedure, CrcType, PusError, PusVersion, CRC_CCITT_FALSE};
use crate::ser::SpHeader;
use crate::{PacketError, PacketType, SizeMissmatch, CCSDS_HEADER_LEN};
use core::mem::size_of;
use serde::{Deserialize, Serialize};
use zerocopy::AsBytes;
/// Length without timestamp
pub const PUC_TM_MIN_SEC_HEADER_LEN: usize = 7;
pub const PUS_TM_MIN_LEN_WITHOUT_SOURCE_DATA: usize =
CCSDS_HEADER_LEN + PUC_TM_MIN_SEC_HEADER_LEN + size_of::<CrcType>();
pub mod zc {
use crate::ecss::{PusError, PusVersion};
use zerocopy::{AsBytes, FromBytes, NetworkEndian, Unaligned, U16};
#[derive(FromBytes, AsBytes, Unaligned)]
#[repr(C)]
pub struct PusTmSecHeaderWithoutTimestamp {
pus_version_and_sc_time_ref_status: u8,
service: u8,
subservice: u8,
msg_counter: U16<NetworkEndian>,
dest_id: U16<NetworkEndian>,
}
impl TryFrom<crate::tm::PusTmSecondaryHeader<'_>> for PusTmSecHeaderWithoutTimestamp {
type Error = PusError;
fn try_from(header: crate::tm::PusTmSecondaryHeader) -> Result<Self, Self::Error> {
if header.pus_version != PusVersion::PusC {
return Err(PusError::VersionNotSupported(header.pus_version));
}
Ok(PusTmSecHeaderWithoutTimestamp {
pus_version_and_sc_time_ref_status: ((header.pus_version as u8) << 4)
| header.sc_time_ref_status,
service: header.service,
subservice: header.subservice,
msg_counter: U16::from(header.msg_counter),
dest_id: U16::from(header.dest_id),
})
}
}
impl PusTmSecHeaderWithoutTimestamp {
pub fn to_bytes(&self, slice: &mut [u8]) -> Option<()> {
self.write_to(slice)
}
pub fn from_bytes(slice: &[u8]) -> Option<Self> {
Self::read_from(slice)
}
}
}
#[derive(PartialEq, Serialize, Deserialize, Copy, Clone, Debug)]
pub struct PusTmSecondaryHeader<'slice> {
pus_version: PusVersion,
pub sc_time_ref_status: u8,
pub service: u8,
pub subservice: u8,
pub msg_counter: u16,
pub dest_id: u16,
pub time_stamp: &'slice [u8],
}
impl<'slice> PusTmSecondaryHeader<'slice> {
pub fn new_simple(service: u8, subservice: u8, time_stamp: &'slice [u8]) -> Self {
PusTmSecondaryHeader {
pus_version: PusVersion::PusC,
sc_time_ref_status: 0,
service,
subservice,
msg_counter: 0,
dest_id: 0,
time_stamp,
}
}
pub fn new(
service: u8,
subservice: u8,
msg_counter: u16,
dest_id: u16,
time_stamp: &'slice [u8],
) -> Self {
PusTmSecondaryHeader {
pus_version: PusVersion::PusC,
sc_time_ref_status: 0,
service,
subservice,
msg_counter,
dest_id,
time_stamp,
}
}
}
/// This struct models a PUS telemetry and which can also be used. It is the primary data
/// structure to generate the raw byte representation of PUS telemetry or to
/// deserialize from one from raw bytes.
///
/// There is no spare bytes support yet.
#[derive(PartialEq, Serialize, Deserialize, Debug, Copy, Clone)]
pub struct PusTm<'slice> {
pub sp_header: SpHeader,
pub sec_header: PusTmSecondaryHeader<'slice>,
/// If this is set to false, a manual call to [PusTm::calc_own_crc16] or
/// [PusTm::update_packet_fields] is necessary for the serialized or cached CRC16 to be valid.
pub calc_crc_on_serialization: bool,
#[serde(skip)]
raw_data: Option<&'slice [u8]>,
source_data: Option<&'slice [u8]>,
crc16: Option<u16>,
}
impl<'slice> PusTm<'slice> {
/// Generates a new struct instance.
///
/// # Arguments
///
/// * `sp_header` - Space packet header information. The correct packet type will be set
/// automatically
/// * `pus_params` - Information contained in the data field header, including the service
/// and subservice type
/// * `set_ccsds_len` - Can be used to automatically update the CCSDS space packet data length
/// field. If this is not set to true, [PusTm::update_ccsds_data_len] can be called to set
/// the correct value to this field manually
/// * `app_data` - Custom application data
pub fn new(
sp_header: &mut SpHeader,
sec_header: PusTmSecondaryHeader<'slice>,
source_data: Option<&'slice [u8]>,
set_ccsds_len: bool,
) -> Self {
sp_header.packet_id.ptype = PacketType::Tm;
let mut pus_tm = PusTm {
sp_header: *sp_header,
raw_data: None,
source_data,
sec_header,
calc_crc_on_serialization: true,
crc16: None,
};
if set_ccsds_len {
pus_tm.update_ccsds_data_len();
}
pus_tm
}
pub fn len_packed(&self) -> usize {
let mut length = PUS_TM_MIN_LEN_WITHOUT_SOURCE_DATA;
length += self.sec_header.time_stamp.len();
if let Some(src_data) = self.source_data {
length += src_data.len();
}
length
}
/// This is called automatically if the [set_ccsds_len] argument in the [new] call was used.
/// If this was not done or the time stamp or source data is set or changed after construction,
/// this function needs to be called to ensure that the data length field of the CCSDS header
/// is set correctly
pub fn update_ccsds_data_len(&mut self) {
self.sp_header.data_len =
self.len_packed() as u16 - size_of::<crate::zc::SpHeader>() as u16 - 1;
}
/// This function should be called before the TM packet is serialized if
/// [calc_crc_on_serialization] is set to False. It will calculate and cache the CRC16.
pub fn calc_own_crc16(&mut self) {
let mut digest = CRC_CCITT_FALSE.digest();
let sph_zc = crate::zc::SpHeader::from(self.sp_header);
digest.update(sph_zc.as_bytes());
let pus_tc_header = zc::PusTmSecHeaderWithoutTimestamp::try_from(self.sec_header).unwrap();
digest.update(pus_tc_header.as_bytes());
digest.update(self.sec_header.time_stamp);
if let Some(src_data) = self.source_data {
digest.update(src_data);
}
self.crc16 = Some(digest.finalize())
}
/// This helper function calls both [update_ccsds_data_len] and [calc_own_crc16]
pub fn update_packet_fields(&mut self) {
self.update_ccsds_data_len();
self.calc_own_crc16();
}
pub fn write_to(&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::OtherPacketError(
PacketError::ToBytesSliceTooSmall(SizeMissmatch {
found: slice.len(),
expected: total_size,
}),
));
}
sph_zc
.to_bytes(&mut slice[curr_idx..curr_idx + 6])
.ok_or(PusError::OtherPacketError(
PacketError::ToBytesZeroCopyError,
))?;
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])
.ok_or(PusError::OtherPacketError(
PacketError::ToBytesZeroCopyError,
))?;
curr_idx += sec_header_len;
slice[curr_idx..].copy_from_slice(self.sec_header.time_stamp);
curr_idx += self.sec_header.time_stamp.len();
if let Some(src_data) = self.source_data {
slice[curr_idx..curr_idx + src_data.len()].copy_from_slice(src_data);
curr_idx += src_data.len();
}
let crc16 = crc_procedure(self.calc_crc_on_serialization, &self.crc16, curr_idx, slice)?;
slice[curr_idx..curr_idx + 2].copy_from_slice(crc16.to_be_bytes().as_slice());
curr_idx += 2;
Ok(curr_idx)
}
}
#[cfg(test)]
mod tests {}