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|
//! Packet container support.
//!
//! Some packets contain other packets. This creates a tree
//! structure.
use std::fmt;
use std::hash::{Hash, Hasher};
use std::slice;
use std::vec;
use crate::{
Packet,
crypto::hash,
packet::Iter,
types::HashAlgorithm,
};
/// A packet's body holds either unprocessed bytes, processed bytes,
/// or packets.
///
/// We conceptually divide packets into two parts: the header and the
/// body. Whereas the header is read eagerly when the packet is
/// deserialized, the body is only read on demand.
///
/// A packet's body is stored here either when configured via
/// [`PacketParserBuilder::buffer_unread_content`], when one of the
/// [`PacketPile`] deserialization routines is used, or on demand for
/// a particular packet using the
/// [`PacketParser::buffer_unread_content`] method.
///
/// [`PacketParserBuilder::buffer_unread_content`]: ../parse/struct.PacketParserBuilder.html#method.buffer_unread_content
/// [`PacketPile`]: ../struct.PacketPile.html
/// [`PacketParser::buffer_unread_content`]: ../parse/struct.PacketParser.html#method.buffer_unread_content
///
/// There are three different types of packets:
///
/// - Packets like the [`UserID`] and [`Signature`] packets, don't
/// actually have a body.
///
/// [`UserID`]: ../packet/struct.UserID.html
/// [`Signature`]: ../packet/signature/struct.Signature.html
///
/// - One packet, the literal data packet, includes unstructured
/// data. That data is stored in [`Literal`].
///
/// [`Literal`]: ../packet/struct.Literal.html
///
/// - Some packets are containers. If the parser does not parse the
/// packet's child, either because the caller used
/// [`PacketParser::next`] to get the next packet, or the maximum
/// recursion depth was reached, then the packets can be stored here
/// as a byte stream. (If the caller so chooses, the content can be
/// parsed later using the regular deserialization routines, since
/// the content is just an OpenPGP message.)
///
/// [`PacketParser::next`]: ../parse/struct.PacketParser.html#method.next
#[derive(Clone, Debug)]
pub enum Body {
/// Unprocessed packet body.
///
/// The body has not been processed, i.e. it is still encrypted.
///
/// Note: if some of a packet's data is streamed, and the
/// `PacketParser` is configured to buffer unread content, then
/// this is not the packet's entire content; it is just the unread
/// content.
Unprocessed(Vec<u8>),
/// Processed packed body.
///
/// The body has been processed, i.e. decompressed or decrypted,
/// but not parsed into packets.
///
/// Note: if some of a packet's data is streamed, and the
/// `PacketParser` is configured to buffer unread content, then
/// this is not the packet's entire content; it is just the unread
/// content.
Processed(Vec<u8>),
/// Parsed packet body.
///
/// Used by container packets (such as the encryption and
/// compression packets) to reference their immediate children.
/// This results in a tree structure.
///
/// This is automatically populated when using the [`PacketPile`]
/// deserialization routines, e.g., [`PacketPile::from_file`]. By
/// default, it is *not* automatically filled in by the
/// [`PacketParser`] deserialization routines; this needs to be
/// done manually.
///
/// [`PacketPile`]: ../struct.PacketPile.html
/// [`PacketPile::from_file`]: ../struct.PacketPile.html#method.from_file
/// [`PacketParser`]: ../parse/struct.PacketParser.html
Structured(Vec<Packet>),
}
/// Holds packet bodies.
///
/// This is used by OpenPGP container packets, like the compressed
/// data packet, to store the containing packets.
#[derive(Clone)]
pub struct Container {
/// Holds a packet's body.
body: Body,
/// We compute a digest over the body to implement comparison.
body_digest: Vec<u8>,
}
impl std::ops::Deref for Container {
type Target = Body;
fn deref(&self) -> &Self::Target {
&self.body
}
}
// Pick the fastest hash function from the SHA2 family for the
// architectures word size. On 64-bit architectures, SHA512 is almost
// twice as fast, but on 32-bit ones, SHA256 is faster.
#[cfg(target_pointer_width = "64")]
const CONTAINER_BODY_HASH: HashAlgorithm = HashAlgorithm::SHA512;
#[cfg(not(target_pointer_width = "64"))]
const CONTAINER_BODY_HASH: HashAlgorithm = HashAlgorithm::SHA256;
impl PartialEq for Container {
fn eq(&self, other: &Container) -> bool {
use Body::*;
match (&self.body, &other.body) {
(Unprocessed(_), Unprocessed(_)) =>
self.body_digest == other.body_digest,
(Processed(_), Processed(_)) =>
self.body_digest == other.body_digest,
(Structured(a), Structured(b)) =>
a == b,
_ => false,
}
}
}
impl Eq for Container {}
impl Hash for Container {
fn hash<H: Hasher>(&self, state: &mut H) {
if let Body::Structured(packets) = &self.body {
packets.hash(state);
} else {
self.body_digest.hash(state);
}
}
}
impl Default for Container {
fn default() -> Self {
Self {
body: Body::Structured(Vec::with_capacity(0)),
body_digest: Vec::with_capacity(0),
}
}
}
impl From<Vec<Packet>> for Container {
fn from(packets: Vec<Packet>) -> Self {
Self {
body: Body::Structured(packets),
body_digest: Vec::with_capacity(0),
}
}
}
impl fmt::Debug for Container {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fn fmt_bytes(f: &mut fmt::Formatter, tag: &str, bytes: &[u8],
digest: String)
-> fmt::Result
{
let threshold = 16;
let prefix = &bytes[..std::cmp::min(threshold, bytes.len())];
let mut prefix_fmt = crate::fmt::hex::encode(prefix);
if bytes.len() > threshold {
prefix_fmt.push_str("...");
}
prefix_fmt.push_str(&format!(" ({} bytes)", bytes.len())[..]);
f.debug_struct("Container")
.field(tag, &prefix_fmt)
.field("digest", &digest)
.finish()
}
use Body::*;
match &self.body {
Unprocessed(bytes) =>
fmt_bytes(f, "unprocessed", bytes, self.body_digest()),
Processed(bytes) =>
fmt_bytes(f, "processed", bytes, self.body_digest()),
Structured(packets) =>
f.debug_struct("Container").field("packets", packets).finish(),
}
}
}
impl Container {
pub(crate) fn default_unprocessed() -> Self {
Self {
body: Body::Unprocessed(Vec::with_capacity(0)),
body_digest: Self::empty_body_digest(),
}
}
/// Returns a reference to this Packet's children.
///
/// Returns `None` if the body is not structured.
pub fn children_ref(&self) -> Option<&[Packet]> {
if
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