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use Error;
use wire;
use flate2;
use std::io::prelude::*;
use std::io::Cursor;
#[derive(Copy, Clone, Debug)]
pub enum Algorithm
{
Zlib,
}
#[derive(Clone, Debug)]
pub enum Compression
{
Disabled,
Enabled(Algorithm),
}
impl wire::Middleware for Compression
{
fn encode_data(&mut self, data: Vec<u8>) -> Result<Vec<u8>, Error> {
match *self {
Compression::Enabled(algorithm) => match algorithm {
Algorithm::Zlib => {
let e = flate2::write::ZlibEncoder::new(data, flate2::Compression::best());
Ok(e.finish()?)
},
},
Compression::Disabled => Ok(data),
}
}
fn decode_data(&mut self, data: Vec<u8>) -> Result<Vec<u8>, Error> {
match *self {
Compression::Enabled(algorithm) => match algorithm {
Algorithm::Zlib => {
let d = flate2::read::ZlibDecoder::new(Cursor::new(data));
let bytes: Result<Vec<u8>, _> = d.bytes().collect();
Ok(bytes?)
},
},
Compression::Disabled => Ok(data),
}
}
}