lzma

package module

v0.0.1-alpha9 Latest Latest Go to latest Published: May 2, 2024 License: GPL-3.0 Imports: 5 Imported by: 0

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Repository

github.com/kulaginds/lzma

README ¶

Golang LZMA reader implementation

Format specification

This package based on LZMA reader from C++ code LzmaSpec.cpp from specification.

The reader1 and reader2 has constructor specially for sevenzip package.

Benchmark

LZMA1 decompress

I have private 1GB tar file, compressed by lzma-utility from xz package.

Environment:

os: macOS Ventura 13.6.1 (22G313)
arch: amd64
cpu: Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz

Decompression speed:

7z (21.07) - 52.37 MiB/s (+103.77%)
xz (5.4.3) - 43.99 MiB/s (+71.17%)
my (v0.0.1-alpha9) - 42.59 MiB/s (+65.71%)
ulikunitz/xz (orisano fork at commit 4b4c597)- 25.70 MiB/s (compared with this speed)

This reader more fast than package of ulikunitz/xz by reducing allocations, inlining hot functions and unbranching.

Documentation ¶

Index ¶

Variables
func BitTreeDecode(probs []prob, numBits int, rc *rangeDecoder) (uint32, error)
func BitTreeReverseDecode(probs []prob, numBits int, rc *rangeDecoder) (uint32, error)
func DecodeDictSize(properties []byte) (uint32, error)
func DecodeDictSize2(encodedDictSize byte) uint32
func DecodeProp(d byte) (uint8, uint8, uint8, error)
func DecodeUnpackSize(header []byte) uint64
type Reader1
type Reader2
- func NewReader2(inStream io.Reader, dictSize int) (*Reader2, error)
- func NewReader2ForSevenZip(inStream io.Reader, props []byte) (*Reader2, error)
- func (r *Reader2) Read(p []byte) (n int, err error)

Constants ¶

This section is empty.

Variables ¶

View Source

var (
	ErrCorrupted           = errors.New("corrupted")
	ErrIncorrectProperties = errors.New("incorrect LZMA properties")
	ErrResultError         = errors.New("result error")
	ErrDictOutOfRange      = errors.New("dictionary capacity is out of range")
	ErrUnexpectedLZMA2Code = errors.New("unexpected lzma2 code")
	ErrNoLZMAReader        = errors.New("no lzma reader on chunkLZMAResetState")
)

Functions ¶

func BitTreeDecode ¶

func BitTreeDecode(probs []prob, numBits int, rc *rangeDecoder) (uint32, error)

func BitTreeReverseDecode ¶

func BitTreeReverseDecode(probs []prob, numBits int, rc *rangeDecoder) (uint32, error)

func DecodeDictSize ¶

func DecodeDictSize(properties []byte) (uint32, error)

func DecodeDictSize2 ¶

func DecodeDictSize2(encodedDictSize byte) uint32

func DecodeProp ¶

func DecodeProp(d byte) (uint8, uint8, uint8, error)

func DecodeUnpackSize ¶

func DecodeUnpackSize(header []byte) uint64

Types ¶

type Reader1 ¶

type Reader1 struct {
	// contains filtered or unexported fields
}

func NewReader1 ¶

func NewReader1(inStream io.ByteReader) (*Reader1, error)

func NewReader1ForReader2 ¶

func NewReader1ForReader2(inStream io.ByteReader, prop byte, unpackSize uint64, outWindow *window) (*Reader1, error)

func NewReader1ForSevenZip ¶

func NewReader1ForSevenZip(inStream io.ByteReader, props []byte, unpackSize uint64) (*Reader1, error)

func (*Reader1) DecodeDistance ¶

func (r *Reader1) DecodeDistance(len uint32) (uint32, error)

func (*Reader1) DecodeLiteral ¶

func (r *Reader1) DecodeLiteral(state uint32, rep0 uint32) error

func (*Reader1) Read ¶

func (r *Reader1) Read(p []byte) (n int, err error)

func (*Reader1) Reopen ¶

func (r *Reader1) Reopen(inStream io.ByteReader, unpackSize uint64) error

func (*Reader1) Reset ¶

func (r *Reader1) Reset()

type Reader2 ¶

type Reader2 struct {
	// contains filtered or unexported fields
}

func NewReader2 ¶

func NewReader2(inStream io.Reader, dictSize int) (*Reader2, error)

func NewReader2ForSevenZip ¶

func NewReader2ForSevenZip(inStream io.Reader, props []byte) (*Reader2, error)

func (*Reader2) Read ¶

func (r *Reader2) Read(p []byte) (n int, err error)

Source Files ¶

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