Merge pull request rust-lang#329 from MichaelMcDonnell/decompress_file

examples/decompress_file.rs

@@ -0,0 +1,25 @@
+extern crate flate2;
+
+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());
+}