LZW encoder and decoder.

This crate provides a Encoder and Decoder to compress and decompress LZW data. This particular implementation provides the GIF and TIFF variation, as well as the original fixed 12 bit LZW variation.

It's fast, and use limited memory to do so: the decoder only uses the stack.

It works with any [std::io::Read] and [std::io::Write].

Examples

Encoding GIF data

use salzweg::{
decoder::{DecodingError, GifStyleDecoder},
encoder::{EncodingError, GifStyleEncoder},
Endianness,
};

let data = [0, 0, 1, 3];
let mut compressed = vec![];
let mut decompressed = vec![];

GifStyleEncoder::encode(&data[..], &mut compressed, 2).expect("Compression failed");

assert_eq!(compressed, [0x04, 0x32, 0x05]);

GifStyleDecoder::decode(&compressed[..], &mut decompressed, 2).expect("Decompression failed");

assert_eq!(decompressed, data);

Compressing a file using the TIFF variation

use salzweg::encoder::TiffStyleEncoder;
use std::{fs::File, io::BufReader};

let path = std::path::Path::new(env!("CARGO_MANIFEST_DIR"))
.parent()
.expect("Couldn't find parent folder")
.join("test-assets/lorem_ipsum.txt");

let output_file = std::io::sink(); // Let's pretend this is a file.

let data = BufReader::new(File::open(path).expect("Couldn't open the file"));

TiffStyleEncoder::encode(data, output_file).expect("Compression failed");