arithmetic

Documentation

Overview

Package arithmetic contains the jbig2 arithmetic decoder used to decode the jbig2 encoded segments.

Index

• type Decoder
  • func New(r reader.StreamReader) (*Decoder, error)
  • func (d *Decoder) DecodeBit(stats *DecoderStats) (int, error)
  • func (d *Decoder) DecodeIAID(codeLen uint64, stats *DecoderStats) (int64, error)
  • func (d *Decoder) DecodeInt(stats *DecoderStats) (int32, error)
• type DecoderStats
  • func NewStats(contextSize int32, index int32) *DecoderStats
  • func (d *DecoderStats) Copy() *DecoderStats
  • func (d *DecoderStats) Overwrite(dNew *DecoderStats)
  • func (d *DecoderStats) Reset()
  • func (d *DecoderStats) SetIndex(index int32)
  • func (d *DecoderStats) String() string

Types

type Decoder

type Decoder struct {
	// ContextSize is the current decoder context size
	ContextSize          []uint32
	ReferedToContextSize []uint32
	// contains filtered or unexported fields
}

Decoder is the arithmetic Decoder structure, used to decode the jbig2 Segments.

func New

func New(r reader.StreamReader) (*Decoder, error)

New creates new arithmetic Decoder.

func (*Decoder) DecodeBit

func (d *Decoder) DecodeBit(stats *DecoderStats) (int, error)

DecodeBit decodes a single bit using provided decoder stats.

func (*Decoder) DecodeIAID

func (d *Decoder) DecodeIAID(codeLen uint64, stats *DecoderStats) (int64, error)

DecodeIAID decodes the IAID procedure, Annex A.3.

func (*Decoder) DecodeInt

func (d *Decoder) DecodeInt(stats *DecoderStats) (int32, error)

DecodeInt decodes the Integer from the arithmetic Decoder for the provided DecoderStats.

type DecoderStats

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

DecoderStats is the structure that contains arithmetic decode context.

func NewStats

func NewStats(contextSize int32, index int32) *DecoderStats

NewStats creates new DecoderStats of size 'contextSize'.

func (*DecoderStats) Copy

func (d *DecoderStats) Copy() *DecoderStats

Copy copies the DecoderStats.

func (*DecoderStats) Overwrite

func (d *DecoderStats) Overwrite(dNew *DecoderStats)

Overwrite overwrites the codingContextTable from new DecoderStats 'dNew'.

func (*DecoderStats) Reset

func (d *DecoderStats) Reset()

Reset resets current decoder stats.

func (*DecoderStats) SetIndex

func (d *DecoderStats) SetIndex(index int32)

SetIndex sets current decoder stats 'index'.

func (*DecoderStats) String

func (d *DecoderStats) String() string

String implements Stringer interface.