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use std::fmt;
use std::cmp;
use time;
use quickcheck::{Arbitrary, Gen};
use constants::DataFormat;
use conversions::Time;
use Error;
use packet;
use Packet;
use Result;
/// Holds a literal packet.
///
/// A literal packet contains unstructured data. Since the size can
/// be very large, it is advised to process messages containing such
/// packets using a `PacketParser` or a `PacketPileParser` and process
/// the data in a streaming manner rather than the using the
/// `PacketPile::from_file` and related interfaces.
///
/// See [Section 5.9 of RFC 4880] for details.
///
/// [Section 5.9 of RFC 4880]: https://tools.ietf.org/html/rfc4880#section-5.9
#[derive(PartialEq, Eq, Hash, Clone)]
pub struct Literal {
/// CTB packet header fields.
pub(crate) common: packet::Common,
/// A one-octet field that describes how the data is formatted.
format: DataFormat,
/// filename is a string, but strings in Rust are valid UTF-8.
/// There is no guarantee, however, that the filename is valid
/// UTF-8. Thus, we leave filename as a byte array. It can be
/// converted to a string using String::from_utf8() or
/// String::from_utf8_lossy().
filename: Option<Vec<u8>>,
/// A four-octet number that indicates a date associated with the
/// literal data.
date: time::Tm,
}
impl fmt::Debug for Literal {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let filename = if let Some(ref filename) = self.filename {
Some(String::from_utf8_lossy(filename))
} else {
None
};
let body = if let Some(ref body) = self.common.body {
&body[..]
} else {
&b""[..]
};
let threshold = 36;
let prefix = &body[..cmp::min(threshold, body.len())];
let mut prefix_fmt = String::from_utf8_lossy(prefix).into_owned();
if body.len() > threshold {
prefix_fmt.push_str("...");
}
prefix_fmt.push_str(&format!(" ({} bytes)", body.len())[..]);
f.debug_struct("Literal")
.field("format", &self.format)
.field("filename", &filename)
.field("date", &self.date)
.field("body", &prefix_fmt)
.finish()
}
}
impl Literal {
/// Returns a new `Literal` packet.
pub fn new(format: DataFormat) -> Literal {
Literal {
common: Default::default(),
format: format,
filename: None,
date: time::Tm::from_pgp(0),
}
}
/// Gets the Literal packet's body.
pub fn body(&self) -> Option<&[u8]> {
self.common.body.as_ref().map(|b| b.as_slice())
}
/// Sets the Literal packet's body to the provided byte string.
pub fn set_body(&mut self, data: Vec<u8>) -> Vec<u8> {
self.common.set_body(data)
}
/// Gets the Literal packet's content disposition.
pub fn format(&self) -> DataFormat {
self.format
}
/// Sets the Literal packet's content disposition.
pub fn set_format(&mut self, format: DataFormat) -> DataFormat {
::std::mem::replace(&mut self.format, format)
}
/// Gets the literal packet's filename.
///
/// Note: when a literal data packet is protected by a signature,
/// only the literal data packet's body is protected, not the
/// meta-data. As such, this field should normally be ignored.
pub fn filename(&self) -> Option<&[u8]> {
self.filename.as_ref().map(|b| b.as_slice())
}
/// Sets the literal packet's filename field from a byte sequence.
///
/// The standard does not specify the encoding. Filenames must
/// not be longer than 255 bytes.
///
/// Note: when a literal data packet is protected by a signature,
/// only the literal data packet's body is protected, not the
/// meta-data. As such, this field should not be used.
pub fn set_filename_from_bytes(&mut self, filename: &[u8])
-> Result<Option<Vec<u8>>> {
Ok(::std::mem::replace(&mut self.filename, match filename.len() {
0 => None,
1...255 => Some(filename.to_vec()),
n => return
Err(Error::InvalidArgument(
format!("filename too long: {} bytes", n)).into()),
}))
}
/// Sets the literal packet's filename field from a UTF-8 encoded
/// string.
///
/// This is a convenience function, since the field is actually a
/// raw byte string. Filenames must not be longer than 255 bytes.
///
/// Note: when a literal data packet is protected by a signature,
/// only the literal data packet's body is protected, not the
/// meta-data. As such, this field should not be used.
pub fn set_filename(&mut self, filename: &str)
-> Result<Option<Vec<u8>>> {
self.set_filename_from_bytes(filename.as_bytes())
}
/// Gets the literal packet's date field.
///
/// Note: when a literal data packet is protected by a signature,
/// only the literal data packet's body is protected, not the
/// meta-data. As such, this field should normally be ignored.
pub fn date(&self) -> Option<&time::Tm> {
if self.date.to_pgp().unwrap_or(0) == 0 {
None
} else {
Some(&self.date)
}
}
/// Sets the literal packet's date field.
///
/// Note: when a literal data packet is protected by a signature,
/// only the literal data packet's body is protected, not the
/// meta-data. As such, this field should not be used.
pub fn set_date(&mut self, timestamp: Option<time::Tm>) -> Option<time::Tm>
{
let old = ::std::mem::replace(
&mut self.date,
timestamp.map(|t| t.canonicalize())
.unwrap_or(time::Tm::from_pgp(0)));
if old == time::Tm::from_pgp(0) {
None
} else {
Some(old)
}
}
}
impl From<Literal> for Packet {
fn from(s: Literal) -> Self {
Packet::Literal(s)
}
}
impl Arbitrary for Literal {
fn arbitrary<G: Gen>(g: &mut G) -> Self {
let mut l = Literal::new(DataFormat::arbitrary(g));
l.set_body(Vec::<u8>::arbitrary(g));
while let Err(_) = l.set_filename_from_bytes(&Vec::<u8>::arbitrary(g)) {
// Too long, try again.
}
l.set_date(Option::<u32>::arbitrary(g).map(|t| time::Tm::from_pgp(t)));
l
}
}
#[cfg(test)]
mod tests {
use super::*;
use parse::Parse;
use serialize::SerializeInto;
quickcheck! {
fn roundtrip(p: Literal) -> bool {
let q = Literal::from_bytes(&p.to_vec().unwrap()).unwrap();
assert_eq!(p, q);
true
}
}
}