split up NAK PDU API
This commit is contained in:
parent
65d3b4e4e5
commit
6ed023d50d
@ -9,10 +9,182 @@ use super::{
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add_pdu_crc, generic_length_checks_pdu_deserialization, CfdpPdu, FileDirectiveType, PduError,
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add_pdu_crc, generic_length_checks_pdu_deserialization, CfdpPdu, FileDirectiveType, PduError,
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PduHeader, WritablePduPacket,
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PduHeader, WritablePduPacket,
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};
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};
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#[cfg(feature = "serde")]
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#[cfg(feature = "serde")]
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use serde::{Deserialize, Serialize};
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use serde::{Deserialize, Serialize};
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/// Special iterator type for the NAK PDU which allows to iterator over both normal and large file
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#[derive(Debug, PartialEq, Eq, Clone)]
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pub enum SegmentRequests<'a> {
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U32Pairs(&'a [(u32, u32)]),
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U64Pairs(&'a [(u64, u64)]),
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}
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/// NAK PDU abstraction specialized in the creation of NAK PDUs.
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///
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/// It exposes a specialized API which simplifies to generate these NAK PDUs with the
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/// format according to CFDP chapter 5.2.6.
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#[derive(Debug, Clone, PartialEq, Eq)]
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#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
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pub struct NakPduCreator<'seg_reqs> {
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pdu_header: PduHeader,
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start_of_scope: u64,
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end_of_scope: u64,
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segment_requests: Option<SegmentRequests<'seg_reqs>>,
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}
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impl<'seg_reqs> NakPduCreator<'seg_reqs> {
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/// This constructor will set the PDU header [LargeFileFlag] field to the correct value if
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/// segment requests are passed to it. If the segment request field is [None], it will remain
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/// to whatever was configured for the PDU header.
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pub fn new(
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mut pdu_header: PduHeader,
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start_of_scope: u64,
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end_of_scope: u64,
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segment_requests: Option<SegmentRequests<'seg_reqs>>,
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) -> Result<NakPduCreator, PduError> {
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// Force correct direction flag.
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pdu_header.pdu_conf.direction = Direction::TowardsSender;
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if let Some(ref seg_reqs) = segment_requests {
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match seg_reqs {
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SegmentRequests::U32Pairs(_) => {
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if start_of_scope > u32::MAX as u64 || end_of_scope > u32::MAX as u64 {
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return Err(PduError::InvalidStartOrEndOfScopeValue);
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}
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pdu_header.pdu_conf.file_flag = LargeFileFlag::Normal;
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}
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SegmentRequests::U64Pairs(_) => {
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pdu_header.pdu_conf.file_flag = LargeFileFlag::Large;
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}
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}
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}
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let mut nak_pdu = Self {
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pdu_header,
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start_of_scope,
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end_of_scope,
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segment_requests,
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};
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nak_pdu.pdu_header.pdu_datafield_len = nak_pdu.calc_pdu_datafield_len() as u16;
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Ok(nak_pdu)
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}
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pub fn start_of_scope(&self) -> u64 {
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self.start_of_scope
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}
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pub fn end_of_scope(&self) -> u64 {
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self.end_of_scope
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}
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pub fn segment_requests(&self) -> Option<&SegmentRequests> {
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self.segment_requests.as_ref()
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}
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pub fn num_segment_reqs(&self) -> usize {
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match &self.segment_requests {
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Some(seg_reqs) => match seg_reqs {
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SegmentRequests::U32Pairs(pairs) => pairs.len(),
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SegmentRequests::U64Pairs(pairs) => pairs.len(),
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},
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None => 0,
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}
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}
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pub fn pdu_header(&self) -> &PduHeader {
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&self.pdu_header
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}
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fn calc_pdu_datafield_len(&self) -> usize {
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let mut datafield_len = 1;
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if self.file_flag() == LargeFileFlag::Normal {
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datafield_len += 8;
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datafield_len += self.num_segment_reqs() * 8;
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} else {
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datafield_len += 16;
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datafield_len += self.num_segment_reqs() * 16;
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}
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if self.crc_flag() == CrcFlag::WithCrc {
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datafield_len += 2;
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}
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datafield_len
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}
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}
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impl CfdpPdu for NakPduCreator<'_> {
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fn pdu_header(&self) -> &PduHeader {
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&self.pdu_header
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}
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fn file_directive_type(&self) -> Option<FileDirectiveType> {
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Some(FileDirectiveType::NakPdu)
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}
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}
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impl WritablePduPacket for NakPduCreator<'_> {
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fn write_to_bytes(&self, buf: &mut [u8]) -> Result<usize, PduError> {
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let expected_len = self.len_written();
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if buf.len() < expected_len {
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return Err(ByteConversionError::ToSliceTooSmall {
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found: buf.len(),
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expected: expected_len,
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}
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.into());
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}
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let mut current_idx = self.pdu_header.write_to_bytes(buf)?;
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buf[current_idx] = FileDirectiveType::NakPdu as u8;
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current_idx += 1;
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if let Some(ref seg_reqs) = self.segment_requests {
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match seg_reqs {
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SegmentRequests::U32Pairs(pairs) => {
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// Unwrap is okay here, the API should prevent invalid values which would trigger a
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// panic here.
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let start_of_scope = u32::try_from(self.start_of_scope).unwrap();
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let end_of_scope = u32::try_from(self.end_of_scope).unwrap();
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buf[current_idx..current_idx + 4]
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.copy_from_slice(&start_of_scope.to_be_bytes());
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current_idx += 4;
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buf[current_idx..current_idx + 4].copy_from_slice(&end_of_scope.to_be_bytes());
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current_idx += 4;
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for (next_start_offset, next_end_offset) in *pairs {
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buf[current_idx..current_idx + 4]
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.copy_from_slice(&next_start_offset.to_be_bytes());
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current_idx += 4;
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buf[current_idx..current_idx + 4]
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.copy_from_slice(&next_end_offset.to_be_bytes());
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current_idx += 4;
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}
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}
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SegmentRequests::U64Pairs(pairs) => {
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buf[current_idx..current_idx + 8]
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.copy_from_slice(&self.start_of_scope.to_be_bytes());
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current_idx += 8;
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buf[current_idx..current_idx + 8]
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.copy_from_slice(&self.end_of_scope.to_be_bytes());
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current_idx += 8;
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for (next_start_offset, next_end_offset) in *pairs {
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buf[current_idx..current_idx + 8]
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.copy_from_slice(&next_start_offset.to_be_bytes());
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current_idx += 8;
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buf[current_idx..current_idx + 8]
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.copy_from_slice(&next_end_offset.to_be_bytes());
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current_idx += 8;
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}
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}
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}
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}
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if self.crc_flag() == CrcFlag::WithCrc {
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current_idx = add_pdu_crc(buf, current_idx);
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}
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Ok(current_idx)
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}
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fn len_written(&self) -> usize {
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self.pdu_header.header_len() + self.calc_pdu_datafield_len()
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}
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}
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/// Special iterator type for the NAK PDU which allows to iterate over both normal and large file
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/// segment requests.
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/// segment requests.
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pub struct SegmentRequestIter<'a, T> {
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pub struct SegmentRequestIter<'a, T> {
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seq_req_start: &'a [u8],
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seq_req_start: &'a [u8],
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@ -61,107 +233,31 @@ where
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}
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}
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}
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}
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/// NAK PDU abstraction.
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/// NAK PDU abstraction specialized in the reading NAK PDUs from a raw bytestream.
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///
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///
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/// For more information, refer to CFDP chapter 5.2.6.
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/// This is a zero-copy class where the segment requests can be read using a special iterator
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#[derive(Debug, Copy, Clone, PartialEq, Eq)]
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/// API without the need to copy them.
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#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
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///
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pub struct NakPdu<'seg_reqs> {
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/// The NAK format is expected to be conforming to CFDP chapter 5.2.6.
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pub struct NakPduReader<'seg_reqs> {
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pdu_header: PduHeader,
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pdu_header: PduHeader,
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start_of_scope: u64,
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start_of_scope: u64,
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end_of_scope: u64,
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end_of_scope: u64,
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seg_reqs_raw: &'seg_reqs [u8],
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seg_reqs_raw: &'seg_reqs [u8],
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}
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}
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impl<'seg_reqs> NakPdu<'seg_reqs> {
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impl CfdpPdu for NakPduReader<'_> {
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pub fn new(
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fn pdu_header(&self) -> &PduHeader {
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mut pdu_header: PduHeader,
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start_of_scope: u64,
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end_of_scope: u64,
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seg_reqs_raw: &'seg_reqs [u8],
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) -> Result<NakPdu, PduError> {
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// Force correct direction flag.
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pdu_header.pdu_conf.direction = Direction::TowardsSender;
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if pdu_header.common_pdu_conf().file_flag == LargeFileFlag::Large {
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if seg_reqs_raw.len() % 16 != 0 {
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return Err(PduError::InvalidSegmentRequestFormat);
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}
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} else {
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if seg_reqs_raw.len() % 8 != 0 {
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return Err(PduError::InvalidSegmentRequestFormat);
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}
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if start_of_scope > u32::MAX as u64 || end_of_scope > u32::MAX as u64 {
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return Err(PduError::InvalidStartOrEndOfScopeValue);
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}
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}
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let mut nak_pdu = Self {
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pdu_header,
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start_of_scope,
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end_of_scope,
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seg_reqs_raw,
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};
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nak_pdu.pdu_header.pdu_datafield_len = nak_pdu.calc_pdu_datafield_len() as u16;
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Ok(nak_pdu)
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}
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pub fn start_of_scope(&self) -> u64 {
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self.start_of_scope
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}
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pub fn end_of_scope(&self) -> u64 {
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self.end_of_scope
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}
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pub fn get_normal_segment_requests_iterator(&self) -> Option<SegmentRequestIter<'_, u32>> {
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if self.file_flag() == LargeFileFlag::Large {
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return None;
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}
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Some(SegmentRequestIter {
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seq_req_start: self.seg_reqs_raw,
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current_idx: 0,
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phantom: PhantomData,
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})
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}
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pub fn get_large_segment_requests_iterator(&self) -> Option<SegmentRequestIter<'_, u64>> {
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if self.file_flag() == LargeFileFlag::Normal {
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return None;
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}
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Some(SegmentRequestIter {
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seq_req_start: self.seg_reqs_raw,
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current_idx: 0,
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phantom: PhantomData,
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})
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}
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pub fn num_segment_reqs(&self) -> usize {
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if self.file_flag() == LargeFileFlag::Large {
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self.seg_reqs_raw.len() / 16
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} else {
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self.seg_reqs_raw.len() / 8
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}
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}
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pub fn pdu_header(&self) -> &PduHeader {
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&self.pdu_header
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&self.pdu_header
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}
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}
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fn calc_pdu_datafield_len(&self) -> usize {
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fn file_directive_type(&self) -> Option<FileDirectiveType> {
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let mut datafield_len = 1;
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Some(FileDirectiveType::NakPdu)
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if self.file_flag() == LargeFileFlag::Normal {
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datafield_len += 8;
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datafield_len += self.num_segment_reqs() * 8;
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} else {
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datafield_len += 16;
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datafield_len += self.num_segment_reqs() * 16;
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}
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if self.crc_flag() == CrcFlag::WithCrc {
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datafield_len += 2;
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}
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datafield_len
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}
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}
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}
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pub fn from_bytes(buf: &'seg_reqs [u8]) -> Result<NakPdu, PduError> {
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impl<'seg_reqs> NakPduReader<'seg_reqs> {
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pub fn from_bytes(buf: &'seg_reqs [u8]) -> Result<NakPduReader, PduError> {
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let (pdu_header, mut current_idx) = PduHeader::from_bytes(buf)?;
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let (pdu_header, mut current_idx) = PduHeader::from_bytes(buf)?;
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let full_len_without_crc = pdu_header.verify_length_and_checksum(buf)?;
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let full_len_without_crc = pdu_header.verify_length_and_checksum(buf)?;
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// Minimum length of 9: 1 byte directive field and start and end of scope for normal file
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// Minimum length of 9: 1 byte directive field and start and end of scope for normal file
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@ -205,81 +301,84 @@ impl<'seg_reqs> NakPdu<'seg_reqs> {
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u64::from_be_bytes(buf[current_idx..current_idx + 4].try_into().unwrap());
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u64::from_be_bytes(buf[current_idx..current_idx + 4].try_into().unwrap());
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current_idx += 4;
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current_idx += 4;
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}
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}
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Self::new(
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Ok(Self {
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pdu_header,
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pdu_header,
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start_of_scope,
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start_of_scope,
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end_of_scope,
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end_of_scope,
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&buf[current_idx..full_len_without_crc],
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seg_reqs_raw: &buf[current_idx..full_len_without_crc],
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)
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})
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}
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}
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impl CfdpPdu for NakPdu<'_> {
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fn pdu_header(&self) -> &PduHeader {
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&self.pdu_header
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}
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}
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fn file_directive_type(&self) -> Option<FileDirectiveType> {
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pub fn start_of_scope(&self) -> u64 {
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Some(FileDirectiveType::NakPdu)
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self.start_of_scope
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}
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}
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}
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impl WritablePduPacket for NakPdu<'_> {
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pub fn end_of_scope(&self) -> u64 {
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fn write_to_bytes(&self, buf: &mut [u8]) -> Result<usize, PduError> {
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self.end_of_scope
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let expected_len = self.len_written();
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}
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if buf.len() < expected_len {
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return Err(ByteConversionError::ToSliceTooSmall {
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found: buf.len(),
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expected: expected_len,
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}
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.into());
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}
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let mut current_idx = self.pdu_header.write_to_bytes(buf)?;
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buf[current_idx] = FileDirectiveType::NakPdu as u8;
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current_idx += 1;
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/// This function returns [None] if this NAK PDUs contains segment requests for a large file.
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pub fn get_normal_segment_requests_iterator(&self) -> Option<SegmentRequestIter<'_, u32>> {
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if self.file_flag() == LargeFileFlag::Large {
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if self.file_flag() == LargeFileFlag::Large {
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buf[current_idx..current_idx + 8].copy_from_slice(&self.start_of_scope.to_be_bytes());
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return None;
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current_idx += 8;
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|
||||||
buf[current_idx..current_idx + 8].copy_from_slice(&self.end_of_scope.to_be_bytes());
|
|
||||||
current_idx += 8;
|
|
||||||
// Unwrap is okay here, we checked the file flag.
|
|
||||||
let segments_iter = self.get_large_segment_requests_iterator().unwrap();
|
|
||||||
for (next_start_offset, next_end_offset) in segments_iter {
|
|
||||||
buf[current_idx..current_idx + 8].copy_from_slice(&next_start_offset.to_be_bytes());
|
|
||||||
current_idx += 8;
|
|
||||||
buf[current_idx..current_idx + 8].copy_from_slice(&next_end_offset.to_be_bytes());
|
|
||||||
current_idx += 8;
|
|
||||||
}
|
|
||||||
} else {
|
|
||||||
// Unwrap is okay here, the API should prevent invalid values which would trigger a
|
|
||||||
// panic here.
|
|
||||||
let start_of_scope = u32::try_from(self.start_of_scope).unwrap();
|
|
||||||
let end_of_scope = u32::try_from(self.end_of_scope).unwrap();
|
|
||||||
buf[current_idx..current_idx + 4].copy_from_slice(&start_of_scope.to_be_bytes());
|
|
||||||
current_idx += 4;
|
|
||||||
buf[current_idx..current_idx + 4].copy_from_slice(&end_of_scope.to_be_bytes());
|
|
||||||
current_idx += 4;
|
|
||||||
// Unwrap is okay here, we checked the file flag.
|
|
||||||
let segments_iter = self.get_normal_segment_requests_iterator().unwrap();
|
|
||||||
for (next_start_offset, next_end_offset) in segments_iter {
|
|
||||||
buf[current_idx..current_idx + 4].copy_from_slice(&next_start_offset.to_be_bytes());
|
|
||||||
current_idx += 4;
|
|
||||||
buf[current_idx..current_idx + 4].copy_from_slice(&next_end_offset.to_be_bytes());
|
|
||||||
current_idx += 4;
|
|
||||||
}
|
|
||||||
}
|
}
|
||||||
|
Some(SegmentRequestIter {
|
||||||
if self.crc_flag() == CrcFlag::WithCrc {
|
seq_req_start: self.seg_reqs_raw,
|
||||||
current_idx = add_pdu_crc(buf, current_idx);
|
current_idx: 0,
|
||||||
}
|
phantom: PhantomData,
|
||||||
Ok(current_idx)
|
})
|
||||||
}
|
}
|
||||||
|
|
||||||
fn len_written(&self) -> usize {
|
/// This function returns [None] if this NAK PDUs contains segment requests for a normal file.
|
||||||
self.pdu_header.header_len() + self.calc_pdu_datafield_len()
|
pub fn get_large_segment_requests_iterator(&self) -> Option<SegmentRequestIter<'_, u64>> {
|
||||||
|
if self.file_flag() == LargeFileFlag::Normal {
|
||||||
|
return None;
|
||||||
|
}
|
||||||
|
Some(SegmentRequestIter {
|
||||||
|
seq_req_start: self.seg_reqs_raw,
|
||||||
|
current_idx: 0,
|
||||||
|
phantom: PhantomData,
|
||||||
|
})
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
#[cfg(test)]
|
#[cfg(test)]
|
||||||
mod tests {}
|
mod tests {
|
||||||
|
use crate::cfdp::{
|
||||||
|
pdu::tests::{common_pdu_conf, TEST_DEST_ID, TEST_SEQ_NUM, TEST_SRC_ID},
|
||||||
|
PduType, TransmissionMode,
|
||||||
|
};
|
||||||
|
|
||||||
|
use super::*;
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn test_basic_creator() {
|
||||||
|
let pdu_conf = common_pdu_conf(CrcFlag::NoCrc, LargeFileFlag::Normal);
|
||||||
|
let pdu_header = PduHeader::new_no_file_data(pdu_conf, 0);
|
||||||
|
let nak_pdu =
|
||||||
|
NakPduCreator::new(pdu_header, 0, 0, None).expect("creating NAK PDU creator failed");
|
||||||
|
assert_eq!(nak_pdu.start_of_scope(), 0);
|
||||||
|
assert_eq!(nak_pdu.end_of_scope(), 0);
|
||||||
|
assert_eq!(nak_pdu.segment_requests(), None);
|
||||||
|
assert_eq!(nak_pdu.num_segment_reqs(), 0);
|
||||||
|
|
||||||
|
assert_eq!(nak_pdu.crc_flag(), CrcFlag::NoCrc);
|
||||||
|
assert_eq!(nak_pdu.file_flag(), LargeFileFlag::Normal);
|
||||||
|
assert_eq!(nak_pdu.pdu_type(), PduType::FileDirective);
|
||||||
|
assert_eq!(
|
||||||
|
nak_pdu.file_directive_type(),
|
||||||
|
Some(FileDirectiveType::NakPdu),
|
||||||
|
);
|
||||||
|
assert_eq!(nak_pdu.transmission_mode(), TransmissionMode::Acknowledged);
|
||||||
|
assert_eq!(nak_pdu.direction(), Direction::TowardsSender);
|
||||||
|
assert_eq!(nak_pdu.source_id(), TEST_SRC_ID.into());
|
||||||
|
assert_eq!(nak_pdu.dest_id(), TEST_DEST_ID.into());
|
||||||
|
assert_eq!(nak_pdu.transaction_seq_num(), TEST_SEQ_NUM.into());
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn test_serialization_empty() {}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn test_serialization_one_segment() {}
|
||||||
|
}
|
||||||
|
Loading…
Reference in New Issue
Block a user