Struct Decoder

pub struct Decoder { /* private fields */ }

Provides the decoding engine for Protocol Buffers.

Implementations

impl Decoder

pub fn decode( &mut self, buf: &mut Vec<u8>, dst: &mut Vec<(u32, Typ, Vec<u8>)>, ) -> Result<usize, DecoderError>

Decodes proto3 encoded fields from the provided buf and writes the result into dst.

The returned fields are tuples of format (tag, type, bytes) where the returned bytes represent the encoded value. The developer should wrap each value into the desired DecoderLit and call parse on it.

use httlib_protos::{Decoder, DecoderLit};
 
let mut decoder = Decoder::default();
 
let mut buf = vec![0x85, 0x35, 0x85];
 
let mut dst = vec![];
let size = decoder.decode(&mut buf, &mut dst).unwrap();
 
for (tag, typ, byt) in dst {
    if tag == 1 {
        i32::from(DecoderLit::Int32(byt));
    }
}

This function consumes the buffer only if the decoding succeeds. The provided vector will stay untouched in case of an error or insufficient data.

On success, the number of written bytes is returned otherwise an error is thrown.

Trait Implementations

impl<'a> Default for Decoder

fn default() -> Self

Returns the “default value” for a type.