compression

Documentation

Index

• Constants
• func FirmwareBlockCompress(data []byte, exhaustive bool) (output []byte, err error)
• func FirmwareBlockDecompress(data []byte) (output []byte, err error)
• type Window
  • func CreateWindow() (t Window)
  • func (t *Window) Find(windowIndex int, buf []byte, exhaustive bool) (offsetIndex, length int)
  • func (t *Window) GetByte(offsetIndex int) byte
  • func (t *Window) GetSet(offsetIndex, windowIndex, length int, buf []byte) (int, []byte)
  • func (t *Window) GetSetByte(offsetIndex, windowIndex int) (int, byte)
  • func (t *Window) Index(i int) int
  • func (t *Window) Peek(offsetIndex, length int, buf []byte) []byte
  • func (t *Window) Set(windowIndex int, buf []byte) int
  • func (t *Window) SetByte(windowIndex int, data byte) int

Constants

const DataMaxSize = 0x8000

const LengthBits = 4

const LiteralBits = 8

const MaxCoded = MaxUncoded + (1 << LengthBits)

const MaxUncoded = 2

const OffsetBits = 11

OffsetBits Number of bits for the Window offset. From this the WindowSize will be calculated In other LZSS implementations, this is usually set to 12

const WindowFillValue = 0x20

WindowFillValue Initial value to fill Window[0 : WindowInitialIndex] In other LZSS implementations, this is usually set to 0x20, but Window[] is filled entirely

const WindowInitialIndex = WindowSize - 0x10 - 1

WindowInitialIndex The windowIndex needs to be set to this before compression/decompression In other LZSS implementations, this is usually set to 0

const WindowSize = 1 << OffsetBits

Functions

func FirmwareBlockCompress

func FirmwareBlockCompress(data []byte, exhaustive bool) (output []byte, err error)

func FirmwareBlockDecompress

func FirmwareBlockDecompress(data []byte) (output []byte, err error)

Types

type Window

type Window [WindowSize]byte

func CreateWindow

func CreateWindow() (t Window)

func (*Window) Find

func (t *Window) Find(windowIndex int, buf []byte, exhaustive bool) (offsetIndex, length int)

func (*Window) GetByte

func (t *Window) GetByte(offsetIndex int) byte

func (*Window) GetSet

func (t *Window) GetSet(offsetIndex, windowIndex, length int, buf []byte) (int, []byte)

func (*Window) GetSetByte

func (t *Window) GetSetByte(offsetIndex, windowIndex int) (int, byte)

func (*Window) Index

func (t *Window) Index(i int) int

func (*Window) Peek

func (t *Window) Peek(offsetIndex, length int, buf []byte) []byte

func (*Window) Set

func (t *Window) Set(windowIndex int, buf []byte) int

func (*Window) SetByte

func (t *Window) SetByte(windowIndex int, data byte) int