xpress

Documentation

Overview

Package xpress decompresses the XPRESS (LZ77 + Huffman) compression format used by some WIM resources, per [MS-XCA] "LZ77+Huffman". It is a clean-room port of wimlib's xpress_decompress.c.

Each compressed chunk begins with 256 bytes encoding 512 four-bit Huffman codeword lengths (symbols 0-255 are literals; 256-511 are match headers), followed by a 16-bit-little-endian bitstream of Huffman-coded symbols.

Index

• Variables
• func Decompress(in []byte, outSize int) ([]byte, error)

Variables

var ErrCorrupt = errors.New("xpress: corrupt data")

ErrCorrupt indicates malformed XPRESS data.

Functions

func Decompress

func Decompress(in []byte, outSize int) ([]byte, error)

Decompress decompresses a single XPRESS chunk into exactly outSize bytes.