548 lines
20 KiB
Rust
548 lines
20 KiB
Rust
use crate::cfdp::lv::Lv;
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use crate::cfdp::pdu::{read_fss_field, write_fss_field, FileDirectiveType, PduError, PduHeader};
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use crate::cfdp::tlv::Tlv;
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use crate::cfdp::{ChecksumType, CrcFlag, LargeFileFlag, PduType};
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use crate::{ByteConversionError, SizeMissmatch, CRC_CCITT_FALSE};
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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(&mut buf[written..])?;
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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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/// Helper structure to loop through all options of a metadata PDU. It should be noted that
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/// iterators in Rust are not fallible, but the TLV creation can fail, for example if the raw TLV
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/// data is invalid for some reason. In that case, the iterator will yield [None] because there
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/// is no way to recover from this.
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///
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/// The user can accumulate the length of all TLVs yielded by the iterator and compare it against
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/// the full length of the options to check whether the iterator was able to parse all TLVs
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/// successfully.
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pub struct OptionsIter<'opts> {
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opt_buf: &'opts [u8],
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current_idx: usize,
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}
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impl<'opts> Iterator for OptionsIter<'opts> {
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type Item = Tlv<'opts>;
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fn next(&mut self) -> Option<Self::Item> {
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if self.current_idx == self.opt_buf.len() {
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return None;
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}
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let tlv = Tlv::from_bytes(&self.opt_buf[self.current_idx..]);
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// There are not really fallible iterators so we can't continue here..
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if tlv.is_err() {
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return None;
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}
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let tlv = tlv.unwrap();
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self.current_idx += tlv.len_full();
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Some(tlv)
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}
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}
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/// Metadata PDU abstraction.
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///
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/// For more information, refer to CFDP chapter 5.2.5.
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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_generic(
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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: &'opts [u8],
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) -> Self {
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Self::new_generic(
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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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Some(options),
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)
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}
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pub fn new_generic(
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mut 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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pdu_header.pdu_type = PduType::FileDirective;
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let mut pdu = 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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pdu.pdu_header.pdu_datafield_len = pdu.calc_pdu_datafield_len() as u16;
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pdu
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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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/// Yield an iterator which can be used to loop through all options. Returns [None] if the
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/// options field is empty.
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pub fn options_iter(&self) -> Option<OptionsIter<'opts>> {
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self.options?;
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Some(OptionsIter {
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opt_buf: self.options.unwrap(),
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current_idx: 0,
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})
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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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self.pdu_header.header_len() + self.calc_pdu_datafield_len()
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}
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fn calc_pdu_datafield_len(&self) -> usize {
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// One directve type octet and one byte of the directive parameter field.
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let mut 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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if self.pdu_header.pdu_conf.crc_flag == CrcFlag::WithCrc {
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len += 2;
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}
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len
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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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pub fn write_to_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_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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current_idx += write_fss_field(
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self.pdu_header.common_pdu_conf().file_flag,
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self.metadata_params.file_size,
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&mut buf[current_idx..],
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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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if self.pdu_header.pdu_conf.crc_flag == CrcFlag::WithCrc {
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let mut digest = CRC_CCITT_FALSE.digest();
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digest.update(&buf[..current_idx]);
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buf[current_idx..current_idx + 2].copy_from_slice(&digest.finalize().to_be_bytes());
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current_idx += 2;
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}
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Ok(current_idx)
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}
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pub fn from_bytes<'longest: 'src_name + 'dest_name + 'opts>(
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buf: &'longest [u8],
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) -> Result<Self, PduError> {
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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 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 (fss_len, file_size) =
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read_fss_field(pdu_header.pdu_conf.file_flag, &buf[current_idx + 1..]);
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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 += 1 + fss_len;
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let src_file_name = Lv::from_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_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::{
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build_metadata_opts_from_slice, build_metadata_opts_from_vec, MetadataGenericParams,
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MetadataPdu,
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};
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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::tlv::{Tlv, TlvType};
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use crate::cfdp::{
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ChecksumType, CrcFlag, LargeFileFlag, PduType, SegmentMetadataFlag, SegmentationControl,
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};
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use crate::util::UbfU8;
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use std::vec;
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const SRC_FILENAME: &'static str = "hello-world.txt";
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const DEST_FILENAME: &'static str = "hello-world2.txt";
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fn common_pdu_conf(crc_flag: CrcFlag, fss: LargeFileFlag) -> 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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let mut pdu_conf = CommonPduConfig::new_with_defaults(src_id, dest_id, transaction_seq_num)
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.expect("Generating common PDU config");
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pdu_conf.crc_flag = crc_flag;
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pdu_conf.file_flag = fss;
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pdu_conf
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}
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fn generic_metadata_pdu<'opts>(
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crc_flag: CrcFlag,
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fss: LargeFileFlag,
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opts: Option<&'opts [u8]>,
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) -> (
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Lv<'static>,
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Lv<'static>,
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MetadataPdu<'static, 'static, 'opts>,
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) {
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let pdu_header = PduHeader::new_no_file_data(common_pdu_conf(crc_flag, fss), 0);
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let metadata_params = MetadataGenericParams::new(false, ChecksumType::Crc32, 0x1010);
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let src_filename = Lv::new_from_str(SRC_FILENAME).expect("Generating string LV failed");
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let dest_filename =
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Lv::new_from_str(DEST_FILENAME).expect("Generating destination LV failed");
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(
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src_filename,
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dest_filename,
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MetadataPdu::new_generic(
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pdu_header,
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metadata_params,
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src_filename,
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dest_filename,
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opts,
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),
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)
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}
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#[test]
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fn test_basic() {
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let (src_filename, dest_filename, metadata_pdu) =
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generic_metadata_pdu(CrcFlag::NoCrc, LargeFileFlag::Normal, None);
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assert_eq!(
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metadata_pdu.written_len(),
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metadata_pdu.pdu_header().header_len()
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+ 1
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+ 1
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+ 4
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+ src_filename.len_full()
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+ dest_filename.len_full()
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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 (src_filename, dest_filename, metadata_pdu) =
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generic_metadata_pdu(CrcFlag::NoCrc, LargeFileFlag::Normal, None);
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let mut buf: [u8; 64] = [0; 64];
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let res = metadata_pdu.write_to_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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metadata_pdu.pdu_header.header_len()
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+ 1
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+ 1
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+ 4
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+ src_filename.len_full()
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+ dest_filename.len_full()
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);
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verify_raw_header(metadata_pdu.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()), 0x1010);
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let mut current_idx = 13;
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let src_name_from_raw =
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Lv::from_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_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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#[test]
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fn test_deserialization() {
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let (_, _, metadata_pdu) =
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generic_metadata_pdu(CrcFlag::NoCrc, LargeFileFlag::Normal, None);
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let mut buf: [u8; 64] = [0; 64];
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metadata_pdu.write_to_bytes(&mut buf).unwrap();
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let pdu_read_back = MetadataPdu::from_bytes(&buf);
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assert!(pdu_read_back.is_ok());
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let pdu_read_back = pdu_read_back.unwrap();
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assert_eq!(pdu_read_back, metadata_pdu);
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}
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#[test]
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fn test_with_crc_flag() {
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let (src_filename, dest_filename, metadata_pdu) =
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generic_metadata_pdu(CrcFlag::WithCrc, LargeFileFlag::Normal, None);
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let mut buf: [u8; 64] = [0; 64];
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let write_res = metadata_pdu.write_to_bytes(&mut buf);
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assert!(write_res.is_ok());
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let written = write_res.unwrap();
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assert_eq!(
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written,
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metadata_pdu.pdu_header().header_len()
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+ 1
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+ 1
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+ core::mem::size_of::<u32>()
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+ src_filename.len_full()
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+ dest_filename.len_full()
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+ 2
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);
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let pdu_read_back = MetadataPdu::from_bytes(&buf).unwrap();
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assert_eq!(pdu_read_back, metadata_pdu);
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}
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#[test]
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fn test_with_large_file_flag() {
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let (src_filename, dest_filename, metadata_pdu) =
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generic_metadata_pdu(CrcFlag::NoCrc, LargeFileFlag::Large, None);
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let mut buf: [u8; 64] = [0; 64];
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let write_res = metadata_pdu.write_to_bytes(&mut buf);
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assert!(write_res.is_ok());
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let written = write_res.unwrap();
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assert_eq!(
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written,
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metadata_pdu.pdu_header().header_len()
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+ 1
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+ 1
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+ core::mem::size_of::<u64>()
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+ src_filename.len_full()
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+ dest_filename.len_full()
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);
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let pdu_read_back = MetadataPdu::from_bytes(&buf).unwrap();
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assert_eq!(pdu_read_back, metadata_pdu);
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}
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#[test]
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fn test_opts_builders() {
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let tlv1 = Tlv::new_empty(TlvType::FlowLabel);
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let msg_to_user: [u8; 4] = [1, 2, 3, 4];
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let tlv2 = Tlv::new(TlvType::MsgToUser, &msg_to_user).unwrap();
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let tlv_slice = [tlv1, tlv2];
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|
let mut buf: [u8; 32] = [0; 32];
|
|
let opts = build_metadata_opts_from_slice(&mut buf, &tlv_slice);
|
|
assert!(opts.is_ok());
|
|
let opts_len = opts.unwrap();
|
|
assert_eq!(opts_len, tlv1.len_full() + tlv2.len_full());
|
|
let tlv1_conv_back = Tlv::from_bytes(&buf).unwrap();
|
|
assert_eq!(tlv1_conv_back, tlv1);
|
|
let tlv2_conv_back = Tlv::from_bytes(&buf[tlv1_conv_back.len_full()..]).unwrap();
|
|
assert_eq!(tlv2_conv_back, tlv2);
|
|
}
|
|
|
|
#[test]
|
|
fn test_opts_builders_from_vec() {
|
|
let tlv1 = Tlv::new_empty(TlvType::FlowLabel);
|
|
let msg_to_user: [u8; 4] = [1, 2, 3, 4];
|
|
let tlv2 = Tlv::new(TlvType::MsgToUser, &msg_to_user).unwrap();
|
|
let tlv_vec = vec![tlv1, tlv2];
|
|
let mut buf: [u8; 32] = [0; 32];
|
|
let opts = build_metadata_opts_from_vec(&mut buf, &tlv_vec);
|
|
assert!(opts.is_ok());
|
|
let opts_len = opts.unwrap();
|
|
assert_eq!(opts_len, tlv1.len_full() + tlv2.len_full());
|
|
let tlv1_conv_back = Tlv::from_bytes(&buf).unwrap();
|
|
assert_eq!(tlv1_conv_back, tlv1);
|
|
let tlv2_conv_back = Tlv::from_bytes(&buf[tlv1_conv_back.len_full()..]).unwrap();
|
|
assert_eq!(tlv2_conv_back, tlv2);
|
|
}
|
|
|
|
#[test]
|
|
fn test_with_opts() {
|
|
let tlv1 = Tlv::new_empty(TlvType::FlowLabel);
|
|
let msg_to_user: [u8; 4] = [1, 2, 3, 4];
|
|
let tlv2 = Tlv::new(TlvType::MsgToUser, &msg_to_user).unwrap();
|
|
let tlv_vec = vec![tlv1, tlv2];
|
|
let mut opts_buf: [u8; 32] = [0; 32];
|
|
let opts_len = build_metadata_opts_from_vec(&mut opts_buf, &tlv_vec).unwrap();
|
|
let (src_filename, dest_filename, metadata_pdu) = generic_metadata_pdu(
|
|
CrcFlag::NoCrc,
|
|
LargeFileFlag::Normal,
|
|
Some(&opts_buf[..opts_len]),
|
|
);
|
|
let mut buf: [u8; 128] = [0; 128];
|
|
let write_res = metadata_pdu.write_to_bytes(&mut buf);
|
|
assert!(write_res.is_ok());
|
|
let written = write_res.unwrap();
|
|
assert_eq!(
|
|
written,
|
|
metadata_pdu.pdu_header.header_len()
|
|
+ 1
|
|
+ 1
|
|
+ 4
|
|
+ src_filename.len_full()
|
|
+ dest_filename.len_full()
|
|
+ opts_len
|
|
);
|
|
let pdu_read_back = MetadataPdu::from_bytes(&buf).unwrap();
|
|
assert_eq!(pdu_read_back, metadata_pdu);
|
|
let opts_iter = pdu_read_back.options_iter();
|
|
assert!(opts_iter.is_some());
|
|
let opts_iter = opts_iter.unwrap();
|
|
let mut accumulated_len = 0;
|
|
for (idx, opt) in opts_iter.enumerate() {
|
|
assert_eq!(tlv_vec[idx], opt);
|
|
accumulated_len += opt.len_full();
|
|
}
|
|
assert_eq!(accumulated_len, pdu_read_back.options().unwrap().len());
|
|
}
|
|
|
|
#[test]
|
|
fn test_corrects_pdu_header() {
|
|
let pdu_header = PduHeader::new_for_file_data(
|
|
common_pdu_conf(CrcFlag::NoCrc, LargeFileFlag::Normal),
|
|
0,
|
|
SegmentMetadataFlag::NotPresent,
|
|
SegmentationControl::NoRecordBoundaryPreservation,
|
|
);
|
|
let metadata_params = MetadataGenericParams::new(false, ChecksumType::Crc32, 10);
|
|
let src_filename = Lv::new_from_str(SRC_FILENAME).expect("Generating string LV failed");
|
|
let dest_filename =
|
|
Lv::new_from_str(DEST_FILENAME).expect("Generating destination LV failed");
|
|
let metadata_pdu =
|
|
MetadataPdu::new(pdu_header, metadata_params, src_filename, dest_filename);
|
|
assert_eq!(metadata_pdu.pdu_header().pdu_type(), PduType::FileDirective);
|
|
}
|
|
}
|