decompress_file.rs

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use flate2::bufread;

use std::env::args;

use std::fs::File;

use std::io::copy;

use std::io::BufReader;

use std::time::Instant;

fn main() {

    // E.g. `cargo run --example decompress_file examples/hello_world.txt.gz hello_world.txt`

    if args().len() != 3 {

        eprintln!("Usage: ./decompress_file `source` `target`");

        return;

    let input = BufReader::new(File::open(args().nth(1).unwrap()).unwrap());

    let mut output = File::create(args().nth(2).unwrap()).unwrap();

    let source_len = input.get_ref().metadata().unwrap().len();

    let start = Instant::now();

    let mut decoder = bufread::GzDecoder::new(input);

    copy(&mut decoder, &mut output).unwrap();

    println!("Source len: {:?}", source_len);

    println!("Target len: {:?}", output.metadata().unwrap().len());

    println!("Elapsed: {:?}", start.elapsed());