A gzip streaming encoder

This structure implements a Read interface. When read from, it reads uncompressed data from the underlying BufRead and provides the compressed data.

Examples

use std::io::prelude::*;
use std::io;
use flate2::Compression;
use flate2::bufread::GzEncoder;
use std::fs::File;
use std::io::BufReader;

// Opens sample file, compresses the contents and returns a Vector or error
// File wrapped in a BufReader implements BufRead

fn open_hello_world() -> io::Result<Vec<u8>> {
    let f = File::open("examples/hello_world.txt")?;
    let b = BufReader::new(f);
    let mut gz = GzEncoder::new(b, Compression::fast());
    let mut buffer = Vec::new();
    gz.read_to_end(&mut buffer)?;
    Ok(buffer)
}