Struct sequoia_openpgp::serialize::stream::LiteralWriter[][src]

pub struct LiteralWriter<'a> { /* fields omitted */ }
Expand description

Writes a literal data packet.

Literal data, i.e. the payload or plaintext, must be wrapped in a literal data packet to be transported over OpenPGP (see Section 5.9 of RFC 4880). The body will be written using partial length encoding, or, if the body is short, using full length encoding.

Note on metadata

A literal data packet can communicate some metadata: a hint as to what kind of data is transported, the original file name, and a timestamp. Note that this metadata will not be authenticated by signatures (but will be authenticated by a SEIP/MDC container), and are therefore unreliable and should not be trusted.

Therefore, it is good practice not to set this metadata when creating a literal data packet, and not to interpret it when consuming one.

Implementations

Creates a new literal writer.

Examples
use std::io::Write;
use sequoia_openpgp as openpgp;
use openpgp::serialize::stream::{Message, LiteralWriter};

let mut sink = vec![];
{
    let message = Message::new(&mut sink);
    let mut message = LiteralWriter::new(message)
        // Customize the `LiteralWriter` here.
        .build()?;
    message.write_all(b"Hello world.")?;
    message.finalize()?;
}
assert_eq!(b"\xcb\x12b\x00\x00\x00\x00\x00Hello world.",
           sink.as_slice());

Sets the data format.

Examples
use std::io::Write;
use sequoia_openpgp as openpgp;
use openpgp::types::DataFormat;
use openpgp::serialize::stream::{Message, LiteralWriter};

let mut sink = vec![];
{
    let message = Message::new(&mut sink);
    let mut message = LiteralWriter::new(message)
        .format(DataFormat::Text)
        .build()?;
    message.write_all(b"Hello world.")?;
    message.finalize()?;
}
assert_eq!(b"\xcb\x12t\x00\x00\x00\x00\x00Hello world.",
           sink.as_slice());

Sets the filename.

The standard does not specify the encoding. Filenames must not be longer than 255 bytes. Returns an error if the given name is longer than that.

Examples
use std::io::Write;
use sequoia_openpgp as openpgp;
use openpgp::serialize::stream::{Message, LiteralWriter};

let mut sink = vec![];
{
    let message = Message::new(&mut sink);
    let mut message = LiteralWriter::new(message)
        .filename("foobar")?
        .build()?;
    message.write_all(b"Hello world.")?;
    message.finalize()?;
}
assert_eq!(b"\xcb\x18b\x06foobar\x00\x00\x00\x00Hello world.",
           sink.as_slice());

Sets the date.

This date may be the modification date or the creation date. Returns an error if the given date is not representable by OpenPGP.

Examples
use std::io::Write;
use sequoia_openpgp as openpgp;
use openpgp::types::Timestamp;
use openpgp::serialize::stream::{Message, LiteralWriter};

let mut sink = vec![];
{
    let message = Message::new(&mut sink);
    let mut message = LiteralWriter::new(message)
        .date(Timestamp::from(1585925313))?
        .build()?;
    message.write_all(b"Hello world.")?;
    message.finalize()?;
}
assert_eq!(b"\xcb\x12b\x00\x5e\x87\x4c\xc1Hello world.",
           sink.as_slice());

Builds the literal writer, returning the writer stack.

The next step is to write the payload to the writer stack.

Examples
use std::io::Write;
use sequoia_openpgp as openpgp;
use openpgp::serialize::stream::{Message, LiteralWriter};

let mut sink = vec![];
{
    let message = Message::new(&mut sink);
    let mut message = LiteralWriter::new(message)
        // Customize the `LiteralWriter` here.
        .build()?;
    message.write_all(b"Hello world.")?;
    message.finalize()?;
}
assert_eq!(b"\xcb\x12b\x00\x00\x00\x00\x00Hello world.",
           sink.as_slice());

Trait Implementations

Formats the value using the given formatter. Read more

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

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

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

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

Determines if this Writer has an efficient write_vectored implementation. Read more

Attempts to write an entire buffer into this writer. Read more

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

Attempts to write multiple buffers into this writer. Read more

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

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

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Performs the conversion.

Performs the conversion.

Should always be Self

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.