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//! Extracts files from an archive.
//!
//! To extract all files from an archive into the current directory, run:
//!
//! ```shell
//! cargo run --example extract <path/to/archive.a>
//! ```
//!
//! This is roughly equivalent to running:
//!
//! ```shell
//! ar -x <path/to/archive.a>
//! ```
extern crate ar;
use std::env;
use std::fs::File;
use std::io;
use std::path::Path;
use std::str;
fn main() {
let num_args = env::args().count();
if num_args != 2 {
println!("Usage: extract <path/to/archive.a>");
return;
}
let input_path = env::args().nth(1).unwrap();
let input_path = Path::new(&input_path);
let input_file =
File::open(input_path).expect("failed to open input file");
let mut archive = ar::Archive::new(input_file);
while let Some(entry) = archive.next_entry() {
let mut entry = entry.expect("failed to parse archive entry");
let output_path = Path::new(
str::from_utf8(entry.header().identifier())
.expect("Non UTF-8 filename"),
)
.to_path_buf();
let mut output_file = File::create(&output_path)
.expect(&format!("unable to create file {:?}", output_path));
io::copy(&mut entry, &mut output_file)
.expect(&format!("failed to extract file {:?}", output_path));
}
}
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