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#![crate_name = "flate"]
#![experimental]
#![crate_type = "rlib"]
#![crate_type = "dylib"]
#![doc(html_logo_url = "http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
html_favicon_url = "http://www.rust-lang.org/favicon.ico",
html_root_url = "http://doc.rust-lang.org/nightly/")]
#![feature(phase, unboxed_closures)]
#[cfg(test)] #[phase(plugin, link)] extern crate log;
extern crate libc;
use libc::{c_void, size_t, c_int};
use std::c_vec::CVec;
use std::ptr::Unique;
#[link(name = "miniz", kind = "static")]
extern {
fn tdefl_compress_mem_to_heap(psrc_buf: *const c_void,
src_buf_len: size_t,
pout_len: *mut size_t,
flags: c_int)
-> *mut c_void;
fn tinfl_decompress_mem_to_heap(psrc_buf: *const c_void,
src_buf_len: size_t,
pout_len: *mut size_t,
flags: c_int)
-> *mut c_void;
}
static LZ_NORM : c_int = 0x80;
static TINFL_FLAG_PARSE_ZLIB_HEADER : c_int = 0x1;
static TDEFL_WRITE_ZLIB_HEADER : c_int = 0x01000;
fn deflate_bytes_internal(bytes: &[u8], flags: c_int) -> Option<CVec<u8>> {
unsafe {
let mut outsz : size_t = 0;
let res = tdefl_compress_mem_to_heap(bytes.as_ptr() as *const _,
bytes.len() as size_t,
&mut outsz,
flags);
if !res.is_null() {
let res = Unique(res);
Some(CVec::new_with_dtor(res.0 as *mut u8, outsz as uint, move|:| libc::free(res.0)))
} else {
None
}
}
}
pub fn deflate_bytes(bytes: &[u8]) -> Option<CVec<u8>> {
deflate_bytes_internal(bytes, LZ_NORM)
}
pub fn deflate_bytes_zlib(bytes: &[u8]) -> Option<CVec<u8>> {
deflate_bytes_internal(bytes, LZ_NORM | TDEFL_WRITE_ZLIB_HEADER)
}
fn inflate_bytes_internal(bytes: &[u8], flags: c_int) -> Option<CVec<u8>> {
unsafe {
let mut outsz : size_t = 0;
let res = tinfl_decompress_mem_to_heap(bytes.as_ptr() as *const _,
bytes.len() as size_t,
&mut outsz,
flags);
if !res.is_null() {
let res = Unique(res);
Some(CVec::new_with_dtor(res.0 as *mut u8, outsz as uint, move|:| libc::free(res.0)))
} else {
None
}
}
}
pub fn inflate_bytes(bytes: &[u8]) -> Option<CVec<u8>> {
inflate_bytes_internal(bytes, 0)
}
pub fn inflate_bytes_zlib(bytes: &[u8]) -> Option<CVec<u8>> {
inflate_bytes_internal(bytes, TINFL_FLAG_PARSE_ZLIB_HEADER)
}
#[cfg(test)]
mod tests {
use super::{inflate_bytes, deflate_bytes};
use std::rand;
use std::rand::Rng;
#[test]
fn test_flate_round_trip() {
let mut r = rand::thread_rng();
let mut words = vec!();
for _ in range(0u, 20) {
let range = r.gen_range(1u, 10);
let v = r.gen_iter::<u8>().take(range).collect::<Vec<u8>>();
words.push(v);
}
for _ in range(0u, 20) {
let mut input = vec![];
for _ in range(0u, 2000) {
input.push_all(r.choose(words.as_slice()).unwrap().as_slice());
}
debug!("de/inflate of {} bytes of random word-sequences",
input.len());
let cmp = deflate_bytes(input.as_slice()).expect("deflation failed");
let out = inflate_bytes(cmp.as_slice()).expect("inflation failed");
debug!("{} bytes deflated to {} ({:.1}% size)",
input.len(), cmp.len(),
100.0 * ((cmp.len() as f64) / (input.len() as f64)));
assert_eq!(input, out.as_slice());
}
}
#[test]
fn test_zlib_flate() {
let bytes = vec!(1, 2, 3, 4, 5);
let deflated = deflate_bytes(bytes.as_slice()).expect("deflation failed");
let inflated = inflate_bytes(deflated.as_slice()).expect("inflation failed");
assert_eq!(inflated.as_slice(), bytes);
}
}