zstd 0.3.0

Binding for the zstd compression library.
Documentation 
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extern crate zstd;

use std::env;
use std::str::FromStr;
use std::io::{self, Write};

fn main() {
    match env::args().skip(1).next() {
        None => {
            writeln!(&mut io::stderr(),
                     "Invalid option. Usage: `stream [-d|-1..-21]`")
                .unwrap();
        }
        Some(ref option) if option == "-d" => decompress(),
        Some(ref option) => {
            if option.starts_with("-") {
                let level = match i32::from_str(&option[1..]) {
                    Ok(level) => level,
                    Err(e) => panic!("Error parsing compression level: {}", e),
                };
                compress(level);
            } else {
                writeln!(&mut io::stderr(),
                         "Invalid option. Usage: `stream [-d|-1..-21]`")
                    .unwrap();
            }
        }
    }
}

fn compress(level: i32) {
    zstd::stream::copy_encode(io::stdin(), io::stdout(), level).unwrap();
}

fn decompress() {
    zstd::stream::copy_decode(io::stdin(), io::stdout()).unwrap();
}