zstd 0.3.0

Binding for the zstd compression library.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49

extern crate zstd;
extern crate clap;

use std::fs;
use std::io;
use clap::{App, Arg};

fn main() {
    // This will be a simple application:
    // takes a single (repeatable and optional) argument.
    let matches = App::new("zstdcat")
        .version("0.1")
        .author("Yann Collet (zstd), Alexandre Bury (zstd-rs)")
        .about("Decompress FILEs to standard output.")
        .arg(Arg::with_name("FILE")
            .index(1)
            .multiple(true)
            .help("Files to decompress. With no file, or when given -, \
                   read standard input."))
        .get_matches();

    // If nothign was given, act as if `-` was there.
    match matches.values_of("FILE") {
        None => decompress_file("-").unwrap(),
        Some(files) => {
            // Decompress each file sequentially.
            for file in files {
                decompress_file(file).unwrap();
            }
        }
    }
}

// Dispatch the source reader depending on the filename
fn decompress_file(file: &str) -> io::Result<()> {
    match file {
        "-" => decompress_from(io::stdin()),
        other => {
            decompress_from(io::BufReader::new(try!(fs::File::open(other))))
        }
    }
}

// Decompress from a `Reader` into stdout
fn decompress_from<R: io::Read>(r: R) -> io::Result<()> {
    let mut decoder = try!(zstd::Decoder::new(r));
    try!(io::copy(&mut decoder, &mut io::stdout()));
    Ok(())
}