300 lines
11 KiB
Rust
300 lines
11 KiB
Rust
use crate::cfdp::lv::Lv;
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use crate::cfdp::pdu::{FileDirectiveType, PduError, PduHeader};
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use crate::cfdp::tlv::Tlv;
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use crate::cfdp::{ChecksumType, LargeFileFlag};
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use crate::{ByteConversionError, SizeMissmatch};
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#[cfg(feature = "alloc")]
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use alloc::vec::Vec;
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#[cfg(feature = "serde")]
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use serde::{Deserialize, Serialize};
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#[derive(Debug, Copy, Clone, PartialEq, Eq)]
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#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
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pub struct MetadataGenericParams {
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closure_requested: bool,
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checksum_type: ChecksumType,
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file_size: u64,
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}
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impl MetadataGenericParams {
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pub fn new(closure_requested: bool, checksum_type: ChecksumType, file_size: u64) -> Self {
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Self {
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closure_requested,
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checksum_type,
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file_size,
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}
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}
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}
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pub fn build_metadata_opts_from_slice(
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buf: &mut [u8],
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tlvs: &[Tlv],
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) -> Result<usize, ByteConversionError> {
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let mut written = 0;
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for tlv in tlvs {
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written += tlv.write_to_be_bytes(buf)?;
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}
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Ok(written)
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}
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#[cfg(feature = "alloc")]
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pub fn build_metadata_opts_from_vec(
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buf: &mut [u8],
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tlvs: Vec<Tlv>,
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) -> Result<usize, ByteConversionError> {
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build_metadata_opts_from_slice(buf, tlvs.as_slice())
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}
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#[derive(Debug, Copy, Clone, PartialEq, Eq)]
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#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
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pub struct MetadataPdu<'src_name, 'dest_name, 'opts> {
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pdu_header: PduHeader,
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metadata_params: MetadataGenericParams,
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#[cfg_attr(feature = "serde", serde(borrow))]
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src_file_name: Lv<'src_name>,
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#[cfg_attr(feature = "serde", serde(borrow))]
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dest_file_name: Lv<'dest_name>,
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options: Option<&'opts [u8]>,
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}
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impl<'src_name, 'dest_name, 'opts> MetadataPdu<'src_name, 'dest_name, 'opts> {
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pub fn new(
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pdu_header: PduHeader,
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metadata_params: MetadataGenericParams,
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src_file_name: Lv<'src_name>,
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dest_file_name: Lv<'dest_name>,
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) -> Self {
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Self::new_with_opts(
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pdu_header,
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metadata_params,
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src_file_name,
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dest_file_name,
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None,
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)
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}
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pub fn new_with_opts(
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pdu_header: PduHeader,
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metadata_params: MetadataGenericParams,
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src_file_name: Lv<'src_name>,
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dest_file_name: Lv<'dest_name>,
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options: Option<&'opts [u8]>,
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) -> Self {
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Self {
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pdu_header,
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metadata_params,
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src_file_name,
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dest_file_name,
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options,
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}
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}
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pub fn src_file_name(&self) -> Lv<'src_name> {
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self.src_file_name
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}
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pub fn dest_file_name(&self) -> Lv<'dest_name> {
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self.dest_file_name
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}
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pub fn options(&self) -> Option<&'opts [u8]> {
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self.options
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}
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pub fn written_len(&self) -> usize {
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// One directive type octet, and one byte of the parameter field.
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let mut len = self.pdu_header.header_len() + 2;
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if self.pdu_header.common_pdu_conf().file_flag == LargeFileFlag::Large {
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len += 8;
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} else {
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len += 4;
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}
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len += self.src_file_name.len_full();
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len += self.dest_file_name.len_full();
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if let Some(opts) = self.options {
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len += opts.len();
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}
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len
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}
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pub fn write_to_be_bytes(&self, buf: &mut [u8]) -> Result<usize, PduError> {
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let expected_len = self.written_len();
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if buf.len() < expected_len {
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return Err(ByteConversionError::ToSliceTooSmall(SizeMissmatch {
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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_be_bytes(buf)?;
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buf[current_idx] = FileDirectiveType::MetadataPdu as u8;
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current_idx += 1;
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buf[current_idx] = ((self.metadata_params.closure_requested as u8) << 7)
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| (self.metadata_params.checksum_type as u8);
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current_idx += 1;
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if self.pdu_header.common_pdu_conf().file_flag == LargeFileFlag::Large {
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buf[current_idx..current_idx + core::mem::size_of::<u64>()]
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.copy_from_slice(&self.metadata_params.file_size.to_be_bytes());
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current_idx += core::mem::size_of::<u64>()
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} else {
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if self.metadata_params.file_size > u32::MAX as u64 {
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return Err(PduError::FileSizeTooLarge(self.metadata_params.file_size));
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}
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buf[current_idx..current_idx + core::mem::size_of::<u32>()]
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.copy_from_slice(&(self.metadata_params.file_size as u32).to_be_bytes());
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current_idx += core::mem::size_of::<u32>()
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}
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current_idx += self
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.src_file_name
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.write_to_be_bytes(&mut buf[current_idx..])?;
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current_idx += self
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.dest_file_name
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.write_to_be_bytes(&mut buf[current_idx..])?;
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if let Some(opts) = self.options {
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buf[current_idx..current_idx + opts.len()].copy_from_slice(opts);
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current_idx += opts.len();
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}
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Ok(current_idx)
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}
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pub fn from_be_bytes<'longest: 'src_name + 'dest_name + 'opts>(
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buf: &'longest [u8],
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) -> Result<MetadataPdu<'src_name, 'dest_name, 'opts>, PduError> {
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let (pdu_header, mut current_idx) = PduHeader::from_be_bytes(buf)?;
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let full_len_without_crc = pdu_header.verify_length_and_checksum(buf)?;
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let is_large_file = pdu_header.pdu_conf.file_flag == LargeFileFlag::Large;
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// Minimal length: 1 byte + FSS (4 byte) + 2 empty LV (1 byte)
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let mut min_expected_len = current_idx + 7;
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if is_large_file {
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min_expected_len += 4;
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}
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min_expected_len = core::cmp::max(min_expected_len, pdu_header.pdu_len());
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if buf.len() < min_expected_len {
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return Err(ByteConversionError::FromSliceTooSmall(SizeMissmatch {
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found: buf.len(),
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expected: min_expected_len,
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})
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.into());
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}
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let directive_type = FileDirectiveType::try_from(buf[current_idx]).map_err(|_| {
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PduError::InvalidDirectiveType((buf[current_idx], FileDirectiveType::MetadataPdu))
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})?;
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if directive_type != FileDirectiveType::MetadataPdu {
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return Err(PduError::WrongDirectiveType((
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directive_type,
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FileDirectiveType::MetadataPdu,
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)));
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}
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current_idx += 1;
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let file_size = if pdu_header.pdu_conf.file_flag == LargeFileFlag::Large {
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u64::from_be_bytes(buf[current_idx + 1..current_idx + 9].try_into().unwrap())
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} else {
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u32::from_be_bytes(buf[current_idx + 1..current_idx + 5].try_into().unwrap()) as u64
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};
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let metadata_params = MetadataGenericParams {
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closure_requested: ((buf[current_idx] >> 6) & 0b1) != 0,
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checksum_type: ChecksumType::try_from(buf[current_idx] & 0b1111)
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.map_err(|_| PduError::InvalidChecksumType(buf[current_idx] & 0b1111))?,
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file_size,
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};
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current_idx += 5;
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if is_large_file {
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current_idx += 4;
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}
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let src_file_name = Lv::from_be_bytes(&buf[current_idx..])?;
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current_idx += src_file_name.len_full();
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let dest_file_name = Lv::from_be_bytes(&buf[current_idx..])?;
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current_idx += dest_file_name.len_full();
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// All left-over bytes are options.
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let mut options = None;
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if current_idx < full_len_without_crc {
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options = Some(&buf[current_idx..full_len_without_crc]);
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}
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Ok(Self {
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pdu_header,
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metadata_params,
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src_file_name,
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dest_file_name,
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options,
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})
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}
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}
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#[cfg(test)]
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pub mod tests {
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use crate::cfdp::lv::Lv;
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use crate::cfdp::pdu::metadata::{MetadataGenericParams, MetadataPdu};
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use crate::cfdp::pdu::tests::verify_raw_header;
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use crate::cfdp::pdu::{CommonPduConfig, FileDirectiveType, PduHeader};
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use crate::cfdp::ChecksumType;
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use crate::util::UbfU8;
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fn common_pdu_conf() -> CommonPduConfig {
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let src_id = UbfU8::new(5);
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let dest_id = UbfU8::new(10);
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let transaction_seq_num = UbfU8::new(20);
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CommonPduConfig::new_with_defaults(src_id, dest_id, transaction_seq_num)
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.expect("Generating common PDU config")
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}
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#[test]
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fn test_basic() {
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let pdu_header = PduHeader::new_no_file_data(common_pdu_conf(), 0);
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let metadata_params = MetadataGenericParams::new(false, ChecksumType::Crc32, 10);
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let src_filename =
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Lv::new_from_str("hello-world.txt").expect("Generating string LV failed");
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let src_len = src_filename.len_full();
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let dest_filename =
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Lv::new_from_str("hello-world2.txt").expect("Generating destination LV failed");
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let dest_len = dest_filename.len_full();
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let metadata_pdu =
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MetadataPdu::new(pdu_header, metadata_params, src_filename, dest_filename);
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assert_eq!(
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metadata_pdu.written_len(),
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pdu_header.header_len() + 1 + 1 + 4 + src_len + dest_len
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);
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assert_eq!(metadata_pdu.src_file_name(), src_filename);
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assert_eq!(metadata_pdu.dest_file_name(), dest_filename);
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assert_eq!(metadata_pdu.options(), None);
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}
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#[test]
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fn test_serialization() {
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let pdu_header = PduHeader::new_no_file_data(common_pdu_conf(), 0);
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let metadata_params = MetadataGenericParams::new(false, ChecksumType::Crc32, 10);
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let src_filename =
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Lv::new_from_str("hello-world.txt").expect("Generating string LV failed");
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let src_len = src_filename.len_full();
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let dest_filename =
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Lv::new_from_str("hello-world2.txt").expect("Generating destination LV failed");
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let dest_len = dest_filename.len_full();
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let metadata_pdu =
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MetadataPdu::new(pdu_header, metadata_params, src_filename, dest_filename);
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let mut buf: [u8; 64] = [0; 64];
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let res = metadata_pdu.write_to_be_bytes(&mut buf);
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assert!(res.is_ok());
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let written = res.unwrap();
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assert_eq!(
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written,
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pdu_header.header_len() + 1 + 1 + 4 + src_len + dest_len
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);
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verify_raw_header(&pdu_header, &buf);
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assert_eq!(buf[7], FileDirectiveType::MetadataPdu as u8);
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assert_eq!(buf[8] >> 6, false as u8);
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assert_eq!(buf[8] & 0b1111, ChecksumType::Crc32 as u8);
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assert_eq!(u32::from_be_bytes(buf[9..13].try_into().unwrap()), 10);
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let mut current_idx = 13;
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let src_name_from_raw =
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Lv::from_be_bytes(&buf[current_idx..]).expect("Creating source name LV failed");
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assert_eq!(src_name_from_raw, src_filename);
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current_idx += src_name_from_raw.len_full();
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let dest_name_from_raw =
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Lv::from_be_bytes(&buf[current_idx..]).expect("Creating dest name LV failed");
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assert_eq!(dest_name_from_raw, dest_filename);
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current_idx += dest_name_from_raw.len_full();
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// No options, so no additional data here.
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assert_eq!(current_idx, written);
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}
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}
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