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use std::io;
mod encoder;
mod decoder;
pub use self::decoder::Decoder;
pub use self::encoder::{AutoFinishEncoder, Encoder};
pub fn decode_all<R: io::Read>(source: R) -> io::Result<Vec<u8>> {
let mut result = Vec::new();
try!(copy_decode(source, &mut result));
Ok(result)
}
pub fn copy_decode<R, W>(source: R, mut destination: W) -> io::Result<()>
where R: io::Read,
W: io::Write
{
let mut decoder = try!(Decoder::new(source));
try!(io::copy(&mut decoder, &mut destination));
Ok(())
}
pub fn encode_all<R: io::Read>(source: R, level: i32) -> io::Result<Vec<u8>> {
let mut result = Vec::<u8>::new();
try!(copy_encode(source, &mut result, level));
Ok(result)
}
pub fn copy_encode<R, W>(mut source: R, destination: W, level: i32)
-> io::Result<()>
where R: io::Read,
W: io::Write
{
let mut encoder = try!(Encoder::new(destination, level));
try!(io::copy(&mut source, &mut encoder));
try!(encoder.finish());
Ok(())
}
#[cfg(test)]
mod tests {
use super::{Decoder, Encoder};
use super::{copy_encode, decode_all, encode_all};
use partial_io::{PartialOp, PartialWrite};
use std::io;
use std::iter;
#[test]
fn test_end_of_frame() {
use std::io::{Read, Write};
let mut enc = Encoder::new(Vec::new(), 1).unwrap();
enc.write_all(b"foo").unwrap();
let mut compressed = enc.finish().unwrap();
compressed.push(0);
let mut dec = Decoder::new(&compressed[..]).unwrap().single_frame();
let mut buf = Vec::new();
dec.read_to_end(&mut buf).unwrap();
assert_eq!(&buf, b"foo");
}
#[test]
fn test_concatenated_frames() {
let mut buffer = Vec::new();
copy_encode(&b"foo"[..], &mut buffer, 1).unwrap();
copy_encode(&b"bar"[..], &mut buffer, 2).unwrap();
copy_encode(&b"baz"[..], &mut buffer, 3).unwrap();
assert_eq!(&decode_all(&buffer[..]).unwrap(), b"foobarbaz");
}
#[test]
fn test_flush() {
use std::io::Write;
let buf = Vec::new();
let mut z = Encoder::new(buf, 19).unwrap();
z.write_all(b"hello").unwrap();
z.flush().unwrap();
let buf = z.finish().unwrap();
let s = decode_all(&buf[..]).unwrap();
let s = ::std::str::from_utf8(&s).unwrap();
assert_eq!(s, "hello");
}
#[test]
fn test_try_finish() {
use std::io::Write;
let mut z = setup_try_finish();
z.get_mut().set_ops(iter::repeat(PartialOp::Unlimited));
z.flush().unwrap();
let buf = match z.try_finish() {
Ok(buf) => buf.into_inner(),
Err((_z, e)) => panic!("try_finish failed with {:?}", e),
};
assert_eq!(&decode_all(&buf[..]).unwrap(), b"hello");
}
#[test]
#[should_panic]
fn test_write_after_try_finish() {
use std::io::Write;
let mut z = setup_try_finish();
z.write_all(b"hello world").unwrap();
}
fn setup_try_finish() -> Encoder<PartialWrite<Vec<u8>>> {
use std::io::Write;
let buf = PartialWrite::new(Vec::new(),
iter::repeat(PartialOp::Unlimited));
let mut z = Encoder::new(buf, 19).unwrap();
z.write_all(b"hello").unwrap();
z.get_mut()
.set_ops(iter::repeat(PartialOp::Err(io::ErrorKind::WouldBlock)));
let (z, err) = z.try_finish().unwrap_err();
assert_eq!(err.kind(), io::ErrorKind::WouldBlock);
z
}
#[test]
fn test_failing_write() {
use std::io::Write;
let buf = PartialWrite::new(Vec::new(), iter::repeat(PartialOp::Err(io::ErrorKind::WouldBlock)));
let mut z = Encoder::new(buf, 1).unwrap();
let input = "b".repeat(128 * 1024).into_bytes();
assert_eq!(z.write(&input).unwrap(), 128 * 1024);
assert_eq!(z.write(b"abc").unwrap_err().kind(),
io::ErrorKind::WouldBlock);
z.get_mut().set_ops(iter::repeat(PartialOp::Unlimited));
let buf = z.finish().unwrap().into_inner();
assert_eq!(&decode_all(&buf[..]).unwrap(), &input);
}
#[test]
fn test_invalid_frame() {
use std::io::Read;
let data = &[1u8, 2u8, 3u8, 4u8, 5u8];
let mut dec = Decoder::new(&data[..]).unwrap();
assert_eq!(dec.read_to_end(&mut Vec::new()).err().map(|e| e.kind()),
Some(io::ErrorKind::Other));
}
#[test]
fn test_incomplete_frame() {
use std::io::{Read, Write};
let mut enc = Encoder::new(Vec::new(), 1).unwrap();
enc.write_all(b"This is a regular string").unwrap();
let mut compressed = enc.finish().unwrap();
let half_size = compressed.len() - 2;
compressed.truncate(half_size);
let mut dec = Decoder::new(&compressed[..]).unwrap();
assert_eq!(dec.read_to_end(&mut Vec::new()).err().map(|e| e.kind()),
Some(io::ErrorKind::UnexpectedEof));
}
#[test]
fn test_legacy() {
use std::fs;
use std::io::Read;
let mut target = Vec::new();
fs::File::open("assets/example.txt")
.unwrap()
.read_to_end(&mut target)
.unwrap();
for version in &[5, 6, 7, 8] {
let filename = format!("assets/example.txt.v{}.zst", version);
let file = fs::File::open(filename).unwrap();
let mut decoder = Decoder::new(file).unwrap();
let mut buffer = Vec::new();
decoder.read_to_end(&mut buffer).unwrap();
assert!(target == buffer,
"Error decompressing legacy version {}",
version);
}
}
fn test_full_cycle(input: &[u8], level: i32) {
::test_cycle_unwrap(input,
|data| encode_all(data, level),
|data| decode_all(data));
}
#[test]
fn test_ll_source() {
let data = include_bytes!("../../zstd-safe/zstd-sys/src/bindings.rs");
for level in 1..5 {
test_full_cycle(data, level);
}
}
}