Struct sequoia_openpgp::serialize::stream::Message

pub struct Message<'a>(/* private fields */);

Streams an OpenPGP message.

Wraps an io::Writer for use with the streaming subsystem. The Message is a stack of filters that create the desired message structure. Literal data must be framed using the LiteralWriter filter. Once all the has been written, the Message must be finalized using Message::finalize.

Implementations

impl<'a> Message<'a>

pub fn new<W: 'a + Write + Send + Sync>(w: W) -> Message<'a>

Starts streaming an OpenPGP message.

Examples

use sequoia_openpgp as openpgp;
use openpgp::serialize::stream::{Message, LiteralWriter};

let message = Message::new(&mut sink);
// Construct the writer stack here.
let mut message = LiteralWriter::new(message).build()?;
// Write literal data to `message` here.
// ...
// Finalize the message.
message.finalize()?;

pub fn finalize_one(self) -> Result<Option<Message<'a>>>

Finalizes the topmost writer, returning the underlying writer.

Finalizes the topmost writer, i.e. flushes any buffered data, and pops it of the stack. This allows for fine-grained control of the resulting message, but must be done with great care. If done improperly, the resulting message may be malformed.

Examples

This demonstrates how to create a compressed, signed message from a detached signature.

use std::io::Write;
use std::convert::TryFrom;
use sequoia_openpgp as openpgp;
use openpgp::packet::{Packet, Signature, one_pass_sig::OnePassSig3};
use openpgp::serialize::Serialize;
use openpgp::serialize::stream::{Message, Compressor, LiteralWriter};

let data: &[u8] = // ...
let sig: Signature = // ...

let message = Message::new(&mut sink);
let mut message = Compressor::new(message).build()?;

// First, write a one-pass-signature packet.
Packet::from(OnePassSig3::try_from(&sig)?)
    .serialize(&mut message)?;

// Then, add the literal data.
let mut message = LiteralWriter::new(message).build()?;
message.write_all(data)?;

// Finally, pop the `LiteralWriter` off the stack to write the
// signature.
let mut message = message.finalize_one()?.unwrap();
Packet::from(sig).serialize(&mut message)?;

// Finalize the message.
message.finalize()?;

pub fn finalize(self) -> Result<()>

Finalizes the message.

Finalizes all writers on the stack, flushing any buffered data.

Note

Failing to finalize the message may result in corrupted messages.

Examples

use sequoia_openpgp as openpgp;
use openpgp::serialize::stream::{Message, LiteralWriter};

let message = Message::new(&mut sink);
// Construct the writer stack here.
let mut message = LiteralWriter::new(message).build()?;
// Write literal data to `message` here.
// ...
// Finalize the message.
message.finalize()?;

Trait Implementations

impl<'a> Debug for Message<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'a> From<&'a mut (dyn Write + Send + Sync)> for Message<'a>

fn from(w: &'a mut (dyn Write + Send + Sync)) -> Self

Converts to this type from the input type.

impl<'a> From<Message<'a>> for Box<dyn Stackable<'a, Cookie> + Send + Sync + 'a>

fn from(s: Message<'a>) -> Self

Converts to this type from the input type.

impl<'a> Write for Message<'a>

fn write(&mut self, buf: &[u8]) -> Result<usize>

Write a buffer into this writer, returning how many bytes were written.

fn flush(&mut self) -> Result<()>

Flush this output stream, ensuring that all intermediately buffered contents reach their destination.

fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> Result<usize, Error>

Like write, except that it writes from a slice of buffers.

fn is_write_vectored(&self) -> bool

🔬This is a nightly-only experimental API. (can_vector)

Determines if this Writer has an efficient write_vectored implementation.

fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>

Attempts to write an entire buffer into this writer.

fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> Result<(), Error>

🔬This is a nightly-only experimental API. (write_all_vectored)

Attempts to write multiple buffers into this writer.

fn write_fmt(&mut self, fmt: Arguments<'_>) -> Result<(), Error>

Writes a formatted string into this writer, returning any error encountered.

fn by_ref(&mut self) -> &mut Self

where Self: Sized,

Creates a “by reference” adapter for this instance of Write.