deflateencoder-bufread.rs

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use flate2::bufread::DeflateEncoder;

use flate2::Compression;

use std::fs::File;

use std::io;

use std::io::prelude::*;

use std::io::BufReader;

// Open file and debug print the contents compressed with Deflate

fn main() {

    println!("{:?}", open_hello_world().unwrap());

// 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 deflater = DeflateEncoder::new(b, Compression::fast());

    let mut buffer = Vec::new();

    deflater.read_to_end(&mut buffer)?;

    Ok(buffer)