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better error handling

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This commit is contained in:
Robin Mueller
2025-09-18 17:35:32 +02:00
parent 49b7c2d072
commit 5375417f68
1 changed files with 11 additions and 3 deletions
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14
src/cfdp/pdu/nak.rs
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@@ -52,13 +52,21 @@ fn write_start_and_end_of_scope(
current_index current_index
} }
#[derive(Debug, PartialEq, Eq, Copy, Clone, thiserror::Error)]
#[error("packet buffer too small for PDU header")]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct TooSmallForPduHeaderError;
/// This function can be used to retrieve the maximum amount of segment request given a PDU /// This function can be used to retrieve the maximum amount of segment request given a PDU
/// configuration to stay below a certain maximum packet size. This is useful to calculate how many /// configuration to stay below a certain maximum packet size. This is useful to calculate how many
/// NAK PDUs are required inside a NAK sequence. /// NAK PDUs are required inside a NAK sequence.
///
/// Returns an error if the packet buffer can not even hold the PDU header.
pub fn calculate_max_segment_requests( pub fn calculate_max_segment_requests(
mut max_packet_size: usize, mut max_packet_size: usize,
pdu_header: &PduHeader, pdu_header: &PduHeader,
) -> Result<usize, usize> { ) -> Result<usize, TooSmallForPduHeaderError> {
let mut decrement = pdu_header.header_len() + 1; let mut decrement = pdu_header.header_len() + 1;
if pdu_header.common_pdu_conf().crc_flag == CrcFlag::WithCrc { if pdu_header.common_pdu_conf().crc_flag == CrcFlag::WithCrc {
decrement += 2; decrement += 2;
@@ -69,7 +77,7 @@ pub fn calculate_max_segment_requests(
decrement += 16; decrement += 16;
} }
if max_packet_size < decrement { if max_packet_size < decrement {
return Err(max_packet_size); return Err(TooSmallForPduHeaderError);
} }
max_packet_size -= decrement; max_packet_size -= decrement;
Ok( Ok(
@@ -330,7 +338,7 @@ impl<'buf> NakPduCreatorWithReservedSeqReqsBuf<'buf> {
pub fn calculate_max_segment_requests( pub fn calculate_max_segment_requests(
max_packet_size: usize, max_packet_size: usize,
pdu_header: &PduHeader, pdu_header: &PduHeader,
) -> Result<usize, usize> { ) -> Result<usize, TooSmallForPduHeaderError> {
calculate_max_segment_requests(max_packet_size, pdu_header) calculate_max_segment_requests(max_packet_size, pdu_header)
} }