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|
//! User Attribute packets and subpackets.
//!
//! See [Section 5.12 of RFC 4880] for details.
//!
//! [Section 5.12 of RFC 4880]: https://tools.ietf.org/html/rfc4880#section-5.12
use std::fmt;
#[cfg(any(test, feature = "quickcheck"))]
use quickcheck::{Arbitrary, Gen};
#[cfg(any(test, feature = "quickcheck"))]
use rand::Rng;
use buffered_reader::BufferedReader;
use crate::Error;
use crate::Result;
use crate::packet::{
self,
header::BodyLength,
};
use crate::Packet;
use crate::serialize::Marshal;
use crate::serialize::MarshalInto;
/// Holds a UserAttribute packet.
///
/// See [Section 5.12 of RFC 4880] for details.
///
/// [Section 5.12 of RFC 4880]: https://tools.ietf.org/html/rfc4880#section-5.12
// IMPORTANT: If you add fields to this struct, you need to explicitly
// IMPORTANT: implement PartialEq, Eq, and Hash.
#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct UserAttribute {
/// CTB packet header fields.
pub(crate) common: packet::Common,
/// The user attribute.
value: Vec<u8>,
}
impl From<Vec<u8>> for UserAttribute {
fn from(u: Vec<u8>) -> Self {
UserAttribute {
common: Default::default(),
value: u,
}
}
}
impl fmt::Debug for UserAttribute {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_struct("UserAttribute")
.field("value (bytes)", &self.value.len())
.finish()
}
}
impl UserAttribute {
/// Returns a new `UserAttribute` packet.
///
/// Note: a valid UserAttribute has at least one subpacket.
pub fn new(subpackets: &[Subpacket]) -> Result<Self> {
let mut value = Vec::with_capacity(
subpackets.iter().fold(0, |l, s| l + s.serialized_len()));
for s in subpackets {
s.serialize(&mut value)?
}
Ok(UserAttribute {
common: Default::default(),
value
})
}
/// Gets the user attribute packet's raw, unparsed value.
///
/// Most likely you will want to use [`subpackets()`] to iterate
/// over the subpackets.
///
/// [`subpackets()`]: #method.subpackets
pub fn value(&self) -> &[u8] {
self.value.as_slice()
}
/// Gets a mutable reference to the user attribute packet's raw
/// value.
pub fn value_mut(&mut self) -> &mut Vec<u8> {
&mut self.value
}
/// Iterates over the subpackets.
pub fn subpackets(&self) -> SubpacketIterator {
SubpacketIterator {
reader: buffered_reader::Memory::new(&self.value[..]),
}
}
}
impl From<UserAttribute> for Packet {
fn from(s: UserAttribute) -> Self {
Packet::UserAttribute(s)
}
}
#[cfg(any(test, feature = "quickcheck"))]
impl Arbitrary for UserAttribute {
fn arbitrary<G: Gen>(g: &mut G) -> Self {
UserAttribute::new(
&(0..g.gen_range(1, 10))
.map(|_| Subpacket::arbitrary(g))
.collect::<Vec<_>>()[..]).unwrap()
}
}
/// Iterates over subpackets.
pub struct SubpacketIterator<'a> {
reader: buffered_reader::Memory<'a, ()>,
}
impl<'a> Iterator for SubpacketIterator<'a> {
type Item = Result<Subpacket>;
fn next(&mut self) -> Option<Self::Item> {
let length = match BodyLength::parse_new_format(&mut self.reader) {
Ok(BodyLength::Full(l)) => l,
Ok(BodyLength::Partial(_)) | Ok(BodyLength::Indeterminate) =>
return Some(Err(Error::MalformedPacket(
"Partial or Indeterminate length of subpacket".into())
.into())),
Err(e) =>
if e.kind() == ::std::io::ErrorKind::UnexpectedEof {
return None;
} else {
return Some(Err(e.into()));
},
};
let raw = match self.reader.data_consume_hard(length as usize) {
Ok(r) => &r[..length as usize],
Err(e) => return Some(Err(e.into())),
};
if raw.len() == 0 {
return Some(Err(Error::MalformedPacket(
"Subpacket without type octet".into()).into()));
}
let typ = raw[0];
let raw = &raw[1..];
match typ {
// Image.
1 => if raw.len() >= 16 &&
&raw[..3] == &[0x10, 0x00, 0x01]
&& raw[4..16].iter().all(|b| *b == 0)
{
let image_kind = raw[3];
Some(Ok(Subpacket::Image(match image_kind {
1 =>
Image::JPEG(Vec::from(&raw[16..]).into_boxed_slice()),
n @ 100..=110 =>
Image::Private(
n, Vec::from(&raw[16..]).into_boxed_slice()),
n =>
Image::Unknown(
n, Vec::from(&raw[16..]).into_boxed_slice()),
})))
} else {
Some(Err(Error::MalformedPacket(
"Malformed image subpacket".into()).into()))
},
n =>
Some(Ok(Subpacket::Unknown(
n, Vec::from(raw).into_boxed_slice()))),
}
}
}
/// User Attribute subpackets.
///
/// See [Section 5.12 of RFC 4880] for details.
///
/// [Section 5.12 of RFC 4880]: https://tools.ietf.org/html/rfc4880#section-5.12
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub enum Subpacket {
/// Image subpacket.
///
/// See [Section 5.12.1 of RFC 4880] for details.
///
/// [Section 5.12.1 of RFC 4880]: https://tools.ietf.org/html/rfc4880#section-5.12.1
Image(Image),
/// Unknown subpacket.
|