Package com.itextpdf.io.codec.brotli.dec

Class Decode

java.lang.Object

com.itextpdf.io.codec.brotli.dec.Decode

final class Decode
extends java.lang.Object

API for Brotli decompression.

Field Summary

Fields

Modifier and Type	Field	Description
private static int[]	CODE_LENGTH_CODE_ORDER
private static int	CODE_LENGTH_CODES
private static int	CODE_LENGTH_REPEAT_CODE
private static int	DEFAULT_CODE_LENGTH
private static int	DISTANCE_CONTEXT_BITS
private static int[]	DISTANCE_SHORT_CODE_INDEX_OFFSET
private static int[]	DISTANCE_SHORT_CODE_VALUE_OFFSET
private static int[]	FIXED_TABLE	Static Huffman code for the code length code lengths.
private static int	HUFFMAN_TABLE_BITS
private static int	HUFFMAN_TABLE_MASK
private static int	LITERAL_CONTEXT_BITS
private static int	NUM_BLOCK_LENGTH_CODES
private static int	NUM_DISTANCE_SHORT_CODES
private static int	NUM_INSERT_AND_COPY_CODES
private static int	NUM_LITERAL_CODES

Constructor Summary

Constructors

Constructor	Description
Decode()

Method Summary

Modifier and Type	Method	Description
private static void	copyUncompressedData(State state)
private static void	decodeBlockTypeAndLength(State state, int treeType)
private static void	decodeCommandBlockSwitch(State state)
private static int	decodeContextMap(int contextMapSize, byte[] contextMap, BitReader br)
private static void	decodeDistanceBlockSwitch(State state)
private static void	decodeLiteralBlockSwitch(State state)
private static void	decodeMetaBlockLength(BitReader br, State state)
private static int	decodeVarLenUnsignedByte(BitReader br)	Decodes a number in the range [0..255], by reading 1 - 11 bits.
(package private) static void	decompress(State state)	Actual decompress implementation.
private static void	inverseMoveToFrontTransform(byte[] v, int vLen)
private static void	maybeReallocateRingBuffer(State state)
private static void	moveToFront(int[] v, int index)
private static int	readBlockLength(int[] table, int offset, BitReader br)
(package private) static void	readHuffmanCode(int alphabetSize, int[] table, int offset, BitReader br)
private static void	readHuffmanCodeLengths(int[] codeLengthCodeLengths, int numSymbols, int[] codeLengths, BitReader br)
private static void	readMetablockHuffmanCodesAndContextMaps(State state)
private static void	readMetablockInfo(State state)	Reads next metablock header.
private static int	readSymbol(int[] table, int offset, BitReader br)	Decodes the next Huffman code from bit-stream.
(package private) static void	setCustomDictionary(State state, byte[] data)
private static int	translateShortCodes(int code, int[] ringBuffer, int index)
private static boolean	writeRingBuffer(State state)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEFAULT_CODE_LENGTH

private static final int DEFAULT_CODE_LENGTH

See Also:

Constant Field Values

CODE_LENGTH_REPEAT_CODE

private static final int CODE_LENGTH_REPEAT_CODE

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Constant Field Values

NUM_LITERAL_CODES

private static final int NUM_LITERAL_CODES

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Constant Field Values

NUM_INSERT_AND_COPY_CODES

private static final int NUM_INSERT_AND_COPY_CODES

See Also:

Constant Field Values

NUM_BLOCK_LENGTH_CODES

private static final int NUM_BLOCK_LENGTH_CODES

See Also:

Constant Field Values

LITERAL_CONTEXT_BITS

private static final int LITERAL_CONTEXT_BITS

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Constant Field Values

DISTANCE_CONTEXT_BITS

private static final int DISTANCE_CONTEXT_BITS

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Constant Field Values

HUFFMAN_TABLE_BITS

private static final int HUFFMAN_TABLE_BITS

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Constant Field Values

HUFFMAN_TABLE_MASK

private static final int HUFFMAN_TABLE_MASK

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Constant Field Values

CODE_LENGTH_CODES

private static final int CODE_LENGTH_CODES

See Also:

Constant Field Values

CODE_LENGTH_CODE_ORDER

private static final int[] CODE_LENGTH_CODE_ORDER

NUM_DISTANCE_SHORT_CODES

private static final int NUM_DISTANCE_SHORT_CODES

See Also:

Constant Field Values

DISTANCE_SHORT_CODE_INDEX_OFFSET

private static final int[] DISTANCE_SHORT_CODE_INDEX_OFFSET

DISTANCE_SHORT_CODE_VALUE_OFFSET

private static final int[] DISTANCE_SHORT_CODE_VALUE_OFFSET

FIXED_TABLE

private static final int[] FIXED_TABLE

Static Huffman code for the code length code lengths.

Constructor Detail

Decode

Decode()

Method Detail

decodeVarLenUnsignedByte

private static int decodeVarLenUnsignedByte(BitReader br)

Decodes a number in the range [0..255], by reading 1 - 11 bits.

decodeMetaBlockLength

private static void decodeMetaBlockLength(BitReader br,
                                          State state)

readSymbol

private static int readSymbol(int[] table,
                              int offset,
                              BitReader br)

Decodes the next Huffman code from bit-stream.

readBlockLength

private static int readBlockLength(int[] table,
                                   int offset,
                                   BitReader br)

translateShortCodes

private static int translateShortCodes(int code,
                                       int[] ringBuffer,
                                       int index)

moveToFront

private static void moveToFront(int[] v,
                                int index)

inverseMoveToFrontTransform

private static void inverseMoveToFrontTransform(byte[] v,
                                                int vLen)

readHuffmanCodeLengths

private static void readHuffmanCodeLengths(int[] codeLengthCodeLengths,
                                           int numSymbols,
                                           int[] codeLengths,
                                           BitReader br)

readHuffmanCode

static void readHuffmanCode(int alphabetSize,
                            int[] table,
                            int offset,
                            BitReader br)

decodeContextMap

private static int decodeContextMap(int contextMapSize,
                                    byte[] contextMap,
                                    BitReader br)

decodeBlockTypeAndLength

private static void decodeBlockTypeAndLength(State state,
                                             int treeType)

decodeLiteralBlockSwitch

private static void decodeLiteralBlockSwitch(State state)

decodeCommandBlockSwitch

private static void decodeCommandBlockSwitch(State state)

decodeDistanceBlockSwitch

private static void decodeDistanceBlockSwitch(State state)

maybeReallocateRingBuffer

private static void maybeReallocateRingBuffer(State state)

readMetablockInfo

private static void readMetablockInfo(State state)

Reads next metablock header.

Parameters:

state - decoding state

readMetablockHuffmanCodesAndContextMaps

private static void readMetablockHuffmanCodesAndContextMaps(State state)

copyUncompressedData

private static void copyUncompressedData(State state)

writeRingBuffer

private static boolean writeRingBuffer(State state)

setCustomDictionary

static void setCustomDictionary(State state,
                                byte[] data)

decompress

static void decompress(State state)

Actual decompress implementation.