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use std::fmt;
use std::ops::{Deref, DerefMut};
use crate::packet::{self, Common};
use crate::Packet;
use crate::Container;
use crate::constants::CompressionAlgorithm;
/// Holds a compressed data packet.
///
/// A compressed data packet is a container. See [Section 5.6 of RFC
/// 4880] for details.
///
/// When the parser encounters a compressed data packet with an
/// unknown compress algorithm, it returns an `Unknown` packet instead
/// of a `CompressedData` packet.
///
/// [Section 5.6 of RFC 4880]: https://tools.ietf.org/html/rfc4880#section-5.6
#[derive(PartialEq, Eq, Hash, Clone)]
pub struct CompressedData {
/// CTB packet header fields.
pub(crate) common: packet::Common,
/// Algorithm used to compress the payload.
algo: CompressionAlgorithm,
}
impl fmt::Debug for CompressedData {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_struct("CompressedData")
.field("algo", &self.algo)
.field("children",
&self.common.children.as_ref()
.map(|c| &c.packets).unwrap_or(&Vec::new()))
.field("body (bytes)",
&self.common.body.as_ref().unwrap_or(&b"".to_vec()).len())
.finish()
}
}
impl CompressedData {
/// Returns a new `CompressedData` packet.
pub fn new(algo: CompressionAlgorithm) -> Self {
CompressedData {
common: Default::default(),
algo: algo,
}
}
/// Gets the compression algorithm.
pub fn algorithm(&self) -> CompressionAlgorithm {
self.algo
}
/// Sets the compression algorithm.
pub fn set_algorithm(&mut self, algo: CompressionAlgorithm) -> CompressionAlgorithm {
::std::mem::replace(&mut self.algo, algo)
}
/// Adds a new packet to the container.
pub fn push(mut self, packet: Packet) -> Self {
if self.common.children.is_none() {
self.common.children = Some(Container::new());
}
self.common.children.as_mut().unwrap().push(packet);
self
}
/// Inserts a new packet to the container at a particular index.
/// If `i` is 0, the new packet is insert at the front of the
/// container. If `i` is one, it is inserted after the first
/// packet, etc.
pub fn insert(mut self, i: usize, packet: Packet) -> Self {
if self.common.children.is_none() {
self.common.children = Some(Container::new());
}
self.common.children.as_mut().unwrap().insert(i, packet);
self
}
}
impl From<CompressedData> for Packet {
fn from(s: CompressedData) -> Self {
Packet::CompressedData(s)
}
}
// Allow transparent access of common fields.
impl<'a> Deref for CompressedData {
type Target = Common;
fn deref(&self) -> &Self::Target {
&self.common
}
}
// Allow transparent access of common fields.
impl<'a> DerefMut for CompressedData {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.common
}
}
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