Remove unnecessary loop and indentation in decompressors
Motivation: Decompression handlers contain heavy use of switch-case statements. We use compact indentation style for 'case' so that we utilize our screen real-estate more efficiently. Also, the following decompression handlers do not need to run a loop, because ByteToMessageDecoder already runs a loop for them: - FastLzFrameDecoder - Lz4FrameDecoder - LzfDecoder Modifications: - Fix indentations - Do not wrap the decoding logic with a for loop when unnecessary - Handle the case where a FastLz/Lzf frame contains no data properly so that the buffer does not leak and less garbage is produced. Result: - Efficiency - Compact source code - No buffer leak
This commit is contained in:
Trustin Lee
parent
79450e081b
commit
ad4418cf9b
@ -81,232 +81,233 @@ public class Bzip2Decoder extends ByteToMessageDecoder {
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if (!in.isReadable()) {
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return;
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}
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final Bzip2BitReader reader = this.reader;
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reader.setByteBuf(in);
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for (;;) {
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switch (currentState) {
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case INIT:
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if (in.readableBytes() < 4) {
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return;
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}
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int magicNumber = in.readUnsignedMedium();
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if (magicNumber != MAGIC_NUMBER) {
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throw new DecompressionException("Unexpected stream identifier contents. Mismatched bzip2 " +
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"protocol version?");
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}
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int blockSize = in.readByte() - '0';
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if (blockSize < MIN_BLOCK_SIZE || blockSize > MAX_BLOCK_SIZE) {
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throw new DecompressionException("block size is invalid");
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}
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this.blockSize = blockSize * BASE_BLOCK_SIZE;
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case INIT:
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if (in.readableBytes() < 4) {
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return;
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}
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int magicNumber = in.readUnsignedMedium();
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if (magicNumber != MAGIC_NUMBER) {
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throw new DecompressionException("Unexpected stream identifier contents. Mismatched bzip2 " +
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"protocol version?");
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}
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int blockSize = in.readByte() - '0';
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if (blockSize < MIN_BLOCK_SIZE || blockSize > MAX_BLOCK_SIZE) {
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throw new DecompressionException("block size is invalid");
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}
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this.blockSize = blockSize * BASE_BLOCK_SIZE;
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streamCRC = 0;
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currentState = State.INIT_BLOCK;
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case INIT_BLOCK:
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if (!reader.hasReadableBytes(10)) {
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return;
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streamCRC = 0;
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currentState = State.INIT_BLOCK;
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case INIT_BLOCK:
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if (!reader.hasReadableBytes(10)) {
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return;
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}
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// Get the block magic bytes.
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final int magic1 = reader.readBits(24);
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final int magic2 = reader.readBits(24);
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if (magic1 == END_OF_STREAM_MAGIC_1 && magic2 == END_OF_STREAM_MAGIC_2) {
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// End of stream was reached. Check the combined CRC.
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final int storedCombinedCRC = reader.readInt();
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if (storedCombinedCRC != streamCRC) {
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throw new DecompressionException("stream CRC error");
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}
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// Get the block magic bytes.
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final int magic1 = reader.readBits(24);
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final int magic2 = reader.readBits(24);
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if (magic1 == END_OF_STREAM_MAGIC_1 && magic2 == END_OF_STREAM_MAGIC_2) {
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// End of stream was reached. Check the combined CRC.
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final int storedCombinedCRC = reader.readInt();
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if (storedCombinedCRC != streamCRC) {
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throw new DecompressionException("stream CRC error");
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}
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currentState = State.EOF;
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break;
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}
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if (magic1 != BLOCK_HEADER_MAGIC_1 || magic2 != BLOCK_HEADER_MAGIC_2) {
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throw new DecompressionException("bad block header");
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}
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blockCRC = reader.readInt();
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currentState = State.INIT_BLOCK_PARAMS;
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case INIT_BLOCK_PARAMS:
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if (!reader.hasReadableBits(25)) {
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return;
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}
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final boolean blockRandomised = reader.readBoolean();
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final int bwtStartPointer = reader.readBits(24);
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currentState = State.EOF;
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break;
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}
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if (magic1 != BLOCK_HEADER_MAGIC_1 || magic2 != BLOCK_HEADER_MAGIC_2) {
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throw new DecompressionException("bad block header");
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}
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blockCRC = reader.readInt();
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currentState = State.INIT_BLOCK_PARAMS;
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case INIT_BLOCK_PARAMS:
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if (!reader.hasReadableBits(25)) {
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return;
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}
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final boolean blockRandomised = reader.readBoolean();
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final int bwtStartPointer = reader.readBits(24);
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blockDecompressor = new Bzip2BlockDecompressor(this.blockSize, blockCRC,
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blockRandomised, bwtStartPointer, reader);
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currentState = State.RECEIVE_HUFFMAN_USED_MAP;
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case RECEIVE_HUFFMAN_USED_MAP:
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if (!reader.hasReadableBits(16)) {
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return;
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}
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blockDecompressor.huffmanInUse16 = reader.readBits(16);
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currentState = State.RECEIVE_HUFFMAN_USED_BITMAPS;
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case RECEIVE_HUFFMAN_USED_BITMAPS:
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Bzip2BlockDecompressor blockDecompressor = this.blockDecompressor;
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final int inUse16 = blockDecompressor.huffmanInUse16;
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final int bitNumber = Integer.bitCount(inUse16);
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final byte[] huffmanSymbolMap = blockDecompressor.huffmanSymbolMap;
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blockDecompressor = new Bzip2BlockDecompressor(this.blockSize, blockCRC,
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blockRandomised, bwtStartPointer, reader);
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currentState = State.RECEIVE_HUFFMAN_USED_MAP;
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case RECEIVE_HUFFMAN_USED_MAP:
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if (!reader.hasReadableBits(16)) {
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return;
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}
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blockDecompressor.huffmanInUse16 = reader.readBits(16);
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currentState = State.RECEIVE_HUFFMAN_USED_BITMAPS;
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case RECEIVE_HUFFMAN_USED_BITMAPS:
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Bzip2BlockDecompressor blockDecompressor = this.blockDecompressor;
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final int inUse16 = blockDecompressor.huffmanInUse16;
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final int bitNumber = Integer.bitCount(inUse16);
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final byte[] huffmanSymbolMap = blockDecompressor.huffmanSymbolMap;
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if (!reader.hasReadableBits(bitNumber * HUFFMAN_SYMBOL_RANGE_SIZE + 3)) {
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return;
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}
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if (!reader.hasReadableBits(bitNumber * HUFFMAN_SYMBOL_RANGE_SIZE + 3)) {
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return;
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}
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int huffmanSymbolCount = 0;
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if (bitNumber > 0) {
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for (int i = 0; i < 16; i++) {
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if ((inUse16 & 1 << 15 >>> i) != 0) {
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for (int j = 0, k = i << 4; j < HUFFMAN_SYMBOL_RANGE_SIZE; j++, k++) {
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if (reader.readBoolean()) {
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huffmanSymbolMap[huffmanSymbolCount++] = (byte) k;
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}
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int huffmanSymbolCount = 0;
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if (bitNumber > 0) {
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for (int i = 0; i < 16; i++) {
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if ((inUse16 & 1 << 15 >>> i) != 0) {
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for (int j = 0, k = i << 4; j < HUFFMAN_SYMBOL_RANGE_SIZE; j++, k++) {
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if (reader.readBoolean()) {
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huffmanSymbolMap[huffmanSymbolCount++] = (byte) k;
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}
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}
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}
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}
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blockDecompressor.huffmanEndOfBlockSymbol = huffmanSymbolCount + 1;
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}
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blockDecompressor.huffmanEndOfBlockSymbol = huffmanSymbolCount + 1;
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int totalTables = reader.readBits(3);
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if (totalTables < HUFFMAN_MINIMUM_TABLES || totalTables > HUFFMAN_MAXIMUM_TABLES) {
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throw new DecompressionException("incorrect huffman groups number");
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}
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int alphaSize = huffmanSymbolCount + 2;
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if (alphaSize > HUFFMAN_MAX_ALPHABET_SIZE) {
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throw new DecompressionException("incorrect alphabet size");
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}
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huffmanStageDecoder = new Bzip2HuffmanStageDecoder(reader, totalTables, alphaSize);
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currentState = State.RECEIVE_SELECTORS_NUMBER;
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case RECEIVE_SELECTORS_NUMBER:
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if (!reader.hasReadableBits(15)) {
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int totalTables = reader.readBits(3);
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if (totalTables < HUFFMAN_MINIMUM_TABLES || totalTables > HUFFMAN_MAXIMUM_TABLES) {
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throw new DecompressionException("incorrect huffman groups number");
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}
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int alphaSize = huffmanSymbolCount + 2;
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if (alphaSize > HUFFMAN_MAX_ALPHABET_SIZE) {
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throw new DecompressionException("incorrect alphabet size");
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}
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huffmanStageDecoder = new Bzip2HuffmanStageDecoder(reader, totalTables, alphaSize);
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currentState = State.RECEIVE_SELECTORS_NUMBER;
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case RECEIVE_SELECTORS_NUMBER:
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if (!reader.hasReadableBits(15)) {
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return;
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}
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int totalSelectors = reader.readBits(15);
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if (totalSelectors < 1 || totalSelectors > MAX_SELECTORS) {
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throw new DecompressionException("incorrect selectors number");
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}
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huffmanStageDecoder.selectors = new byte[totalSelectors];
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currentState = State.RECEIVE_SELECTORS;
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case RECEIVE_SELECTORS:
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Bzip2HuffmanStageDecoder huffmanStageDecoder = this.huffmanStageDecoder;
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byte[] selectors = huffmanStageDecoder.selectors;
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totalSelectors = selectors.length;
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final Bzip2MoveToFrontTable tableMtf = huffmanStageDecoder.tableMTF;
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int currSelector;
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// Get zero-terminated bit runs (0..62) of MTF'ed Huffman table. length = 1..6
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for (currSelector = huffmanStageDecoder.currentSelector;
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currSelector < totalSelectors; currSelector++) {
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if (!reader.hasReadableBits(HUFFMAN_SELECTOR_LIST_MAX_LENGTH)) {
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// Save state if end of current ByteBuf was reached
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huffmanStageDecoder.currentSelector = currSelector;
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return;
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}
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int totalSelectors = reader.readBits(15);
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if (totalSelectors < 1 || totalSelectors > MAX_SELECTORS) {
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throw new DecompressionException("incorrect selectors number");
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int index = 0;
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while (reader.readBoolean()) {
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index++;
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}
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huffmanStageDecoder.selectors = new byte[totalSelectors];
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selectors[currSelector] = tableMtf.indexToFront(index);
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}
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currentState = State.RECEIVE_SELECTORS;
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case RECEIVE_SELECTORS:
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Bzip2HuffmanStageDecoder huffmanStageDecoder = this.huffmanStageDecoder;
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byte[] selectors = huffmanStageDecoder.selectors;
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totalSelectors = selectors.length;
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final Bzip2MoveToFrontTable tableMtf = huffmanStageDecoder.tableMTF;
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currentState = State.RECEIVE_HUFFMAN_LENGTH;
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case RECEIVE_HUFFMAN_LENGTH:
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huffmanStageDecoder = this.huffmanStageDecoder;
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totalTables = huffmanStageDecoder.totalTables;
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final byte[][] codeLength = huffmanStageDecoder.tableCodeLengths;
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alphaSize = huffmanStageDecoder.alphabetSize;
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int currSelector;
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// Get zero-terminated bit runs (0..62) of MTF'ed Huffman table. length = 1..6
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for (currSelector = huffmanStageDecoder.currentSelector;
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currSelector < totalSelectors; currSelector++) {
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if (!reader.hasReadableBits(HUFFMAN_SELECTOR_LIST_MAX_LENGTH)) {
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// Save state if end of current ByteBuf was reached
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huffmanStageDecoder.currentSelector = currSelector;
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return;
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}
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int index = 0;
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while (reader.readBoolean()) {
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index++;
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}
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selectors[currSelector] = tableMtf.indexToFront(index);
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/* Now the coding tables */
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int currGroup;
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int currLength = huffmanStageDecoder.currentLength;
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int currAlpha = 0;
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boolean modifyLength = huffmanStageDecoder.modifyLength;
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boolean saveStateAndReturn = false;
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loop: for (currGroup = huffmanStageDecoder.currentGroup; currGroup < totalTables; currGroup++) {
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// start_huffman_length
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if (!reader.hasReadableBits(5)) {
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saveStateAndReturn = true;
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break;
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}
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currentState = State.RECEIVE_HUFFMAN_LENGTH;
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case RECEIVE_HUFFMAN_LENGTH:
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huffmanStageDecoder = this.huffmanStageDecoder;
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totalTables = huffmanStageDecoder.totalTables;
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final byte[][] codeLength = huffmanStageDecoder.tableCodeLengths;
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alphaSize = huffmanStageDecoder.alphabetSize;
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/* Now the coding tables */
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int currGroup;
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int currLength = huffmanStageDecoder.currentLength;
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int currAlpha = 0;
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boolean modifyLength = huffmanStageDecoder.modifyLength;
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boolean saveStateAndReturn = false;
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loop: for (currGroup = huffmanStageDecoder.currentGroup; currGroup < totalTables; currGroup++) {
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// start_huffman_length
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if (!reader.hasReadableBits(5)) {
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if (currLength < 0) {
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currLength = reader.readBits(5);
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}
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for (currAlpha = huffmanStageDecoder.currentAlpha; currAlpha < alphaSize; currAlpha++) {
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// delta_bit_length: 1..40
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if (!reader.isReadable()) {
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saveStateAndReturn = true;
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break;
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break loop;
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}
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if (currLength < 0) {
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currLength = reader.readBits(5);
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}
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for (currAlpha = huffmanStageDecoder.currentAlpha; currAlpha < alphaSize; currAlpha++) {
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// delta_bit_length: 1..40
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while (modifyLength || reader.readBoolean()) { // 0=>next symbol; 1=>alter length
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if (!reader.isReadable()) {
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modifyLength = true;
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saveStateAndReturn = true;
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break loop;
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}
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// 1=>decrement length; 0=>increment length
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currLength += reader.readBoolean() ? -1 : 1;
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modifyLength = false;
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if (!reader.isReadable()) {
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saveStateAndReturn = true;
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break loop;
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}
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while (modifyLength || reader.readBoolean()) { // 0=>next symbol; 1=>alter length
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if (!reader.isReadable()) {
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modifyLength = true;
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saveStateAndReturn = true;
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break loop;
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}
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// 1=>decrement length; 0=>increment length
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currLength += reader.readBoolean() ? -1 : 1;
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modifyLength = false;
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if (!reader.isReadable()) {
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saveStateAndReturn = true;
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break loop;
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}
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}
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codeLength[currGroup][currAlpha] = (byte) currLength;
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}
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currLength = -1;
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currAlpha = huffmanStageDecoder.currentAlpha = 0;
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modifyLength = false;
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codeLength[currGroup][currAlpha] = (byte) currLength;
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}
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if (saveStateAndReturn) {
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// Save state if end of current ByteBuf was reached
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huffmanStageDecoder.currentGroup = currGroup;
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huffmanStageDecoder.currentLength = currLength;
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huffmanStageDecoder.currentAlpha = currAlpha;
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huffmanStageDecoder.modifyLength = modifyLength;
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return;
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}
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// Finally create the Huffman tables
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huffmanStageDecoder.createHuffmanDecodingTables();
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currentState = State.DECODE_HUFFMAN_DATA;
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case DECODE_HUFFMAN_DATA:
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blockDecompressor = this.blockDecompressor;
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final int oldReaderIndex = in.readerIndex();
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final boolean decoded = blockDecompressor.decodeHuffmanData(this.huffmanStageDecoder);
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if (!decoded) {
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return;
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}
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// It used to avoid "Bzip2Decoder.decode() did not read anything but decoded a message" exception.
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// Because previous operation may read only a few bits from Bzip2BitReader.bitBuffer and
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// don't read incomming ByteBuf.
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if (in.readerIndex() == oldReaderIndex && in.isReadable()) {
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reader.refill();
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}
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final int blockLength = blockDecompressor.blockLength();
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final ByteBuf uncompressed = ctx.alloc().buffer(blockLength);
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boolean success = false;
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try {
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int uncByte;
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while ((uncByte = blockDecompressor.read()) >= 0) {
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uncompressed.writeByte(uncByte);
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}
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int currentBlockCRC = blockDecompressor.checkCRC();
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streamCRC = (streamCRC << 1 | streamCRC >>> 31) ^ currentBlockCRC;
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out.add(uncompressed);
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success = true;
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} finally {
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if (!success) {
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uncompressed.release();
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}
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}
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currentState = State.INIT_BLOCK;
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break;
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case EOF:
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in.skipBytes(in.readableBytes());
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currLength = -1;
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currAlpha = huffmanStageDecoder.currentAlpha = 0;
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modifyLength = false;
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}
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if (saveStateAndReturn) {
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// Save state if end of current ByteBuf was reached
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huffmanStageDecoder.currentGroup = currGroup;
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huffmanStageDecoder.currentLength = currLength;
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huffmanStageDecoder.currentAlpha = currAlpha;
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huffmanStageDecoder.modifyLength = modifyLength;
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return;
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default:
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throw new IllegalStateException();
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}
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// Finally create the Huffman tables
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huffmanStageDecoder.createHuffmanDecodingTables();
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currentState = State.DECODE_HUFFMAN_DATA;
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case DECODE_HUFFMAN_DATA:
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blockDecompressor = this.blockDecompressor;
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final int oldReaderIndex = in.readerIndex();
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final boolean decoded = blockDecompressor.decodeHuffmanData(this.huffmanStageDecoder);
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if (!decoded) {
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return;
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}
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// It used to avoid "Bzip2Decoder.decode() did not read anything but decoded a message" exception.
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// Because previous operation may read only a few bits from Bzip2BitReader.bitBuffer and
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// don't read incomming ByteBuf.
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if (in.readerIndex() == oldReaderIndex && in.isReadable()) {
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reader.refill();
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}
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final int blockLength = blockDecompressor.blockLength();
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final ByteBuf uncompressed = ctx.alloc().buffer(blockLength);
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boolean success = false;
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try {
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int uncByte;
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while ((uncByte = blockDecompressor.read()) >= 0) {
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uncompressed.writeByte(uncByte);
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}
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int currentBlockCRC = blockDecompressor.checkCRC();
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streamCRC = (streamCRC << 1 | streamCRC >>> 31) ^ currentBlockCRC;
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out.add(uncompressed);
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success = true;
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} finally {
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if (!success) {
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uncompressed.release();
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}
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}
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currentState = State.INIT_BLOCK;
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break;
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case EOF:
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in.skipBytes(in.readableBytes());
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return;
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default:
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throw new IllegalStateException();
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}
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}
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}
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@ -18,6 +18,7 @@ package io.netty.handler.codec.compression;
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import io.netty.buffer.ByteBuf;
|
||||
import io.netty.channel.ChannelHandlerContext;
|
||||
import io.netty.handler.codec.ByteToMessageDecoder;
|
||||
import io.netty.util.internal.EmptyArrays;
|
||||
|
||||
import java.util.List;
|
||||
import java.util.zip.Adler32;
|
||||
@ -108,104 +109,115 @@ public class FastLzFrameDecoder extends ByteToMessageDecoder {
|
||||
|
||||
@Override
|
||||
protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
|
||||
for (;;) {
|
||||
try {
|
||||
switch (currentState) {
|
||||
case INIT_BLOCK:
|
||||
if (in.readableBytes() < 4) {
|
||||
return;
|
||||
}
|
||||
|
||||
final int magic = in.readUnsignedMedium();
|
||||
if (magic != MAGIC_NUMBER) {
|
||||
throw new DecompressionException("unexpected block identifier");
|
||||
}
|
||||
|
||||
final byte options = in.readByte();
|
||||
isCompressed = (options & 0x01) == BLOCK_TYPE_COMPRESSED;
|
||||
hasChecksum = (options & 0x10) == BLOCK_WITH_CHECKSUM;
|
||||
|
||||
currentState = State.INIT_BLOCK_PARAMS;
|
||||
case INIT_BLOCK_PARAMS:
|
||||
if (in.readableBytes() < 2 + (isCompressed ? 2 : 0) + (hasChecksum ? 4 : 0)) {
|
||||
return;
|
||||
}
|
||||
currentChecksum = hasChecksum ? in.readInt() : 0;
|
||||
chunkLength = in.readUnsignedShort();
|
||||
originalLength = isCompressed ? in.readUnsignedShort() : chunkLength;
|
||||
|
||||
currentState = State.DECOMPRESS_DATA;
|
||||
case DECOMPRESS_DATA:
|
||||
final int chunkLength = this.chunkLength;
|
||||
if (in.readableBytes() < chunkLength) {
|
||||
return;
|
||||
}
|
||||
|
||||
final int idx = in.readerIndex();
|
||||
final int originalLength = this.originalLength;
|
||||
|
||||
ByteBuf uncompressed = ctx.alloc().heapBuffer(originalLength, originalLength);
|
||||
final byte[] output = uncompressed.array();
|
||||
final int outputPtr = uncompressed.arrayOffset() + uncompressed.writerIndex();
|
||||
|
||||
boolean success = false;
|
||||
try {
|
||||
if (isCompressed) {
|
||||
final byte[] input;
|
||||
final int inputPtr;
|
||||
if (in.hasArray()) {
|
||||
input = in.array();
|
||||
inputPtr = in.arrayOffset() + idx;
|
||||
} else {
|
||||
input = new byte[chunkLength];
|
||||
in.getBytes(idx, input);
|
||||
inputPtr = 0;
|
||||
}
|
||||
|
||||
final int decompressedBytes = decompress(input, inputPtr, chunkLength,
|
||||
output, outputPtr, originalLength);
|
||||
if (originalLength != decompressedBytes) {
|
||||
throw new DecompressionException(String.format(
|
||||
"stream corrupted: originalLength(%d) and actual length(%d) mismatch",
|
||||
originalLength, decompressedBytes));
|
||||
}
|
||||
} else {
|
||||
in.getBytes(idx, output, outputPtr, chunkLength);
|
||||
}
|
||||
|
||||
final Checksum checksum = this.checksum;
|
||||
if (hasChecksum && checksum != null) {
|
||||
checksum.reset();
|
||||
checksum.update(output, outputPtr, originalLength);
|
||||
final int checksumResult = (int) checksum.getValue();
|
||||
if (checksumResult != currentChecksum) {
|
||||
throw new DecompressionException(String.format(
|
||||
"stream corrupted: mismatching checksum: %d (expected: %d)",
|
||||
checksumResult, currentChecksum));
|
||||
}
|
||||
}
|
||||
uncompressed.writerIndex(uncompressed.writerIndex() + originalLength);
|
||||
out.add(uncompressed);
|
||||
in.skipBytes(chunkLength);
|
||||
|
||||
currentState = State.INIT_BLOCK;
|
||||
success = true;
|
||||
} finally {
|
||||
if (!success) {
|
||||
uncompressed.release();
|
||||
}
|
||||
}
|
||||
break;
|
||||
case CORRUPTED:
|
||||
in.skipBytes(in.readableBytes());
|
||||
return;
|
||||
default:
|
||||
throw new IllegalStateException();
|
||||
try {
|
||||
switch (currentState) {
|
||||
case INIT_BLOCK:
|
||||
if (in.readableBytes() < 4) {
|
||||
break;
|
||||
}
|
||||
} catch (Exception e) {
|
||||
currentState = State.CORRUPTED;
|
||||
throw e;
|
||||
|
||||
final int magic = in.readUnsignedMedium();
|
||||
if (magic != MAGIC_NUMBER) {
|
||||
throw new DecompressionException("unexpected block identifier");
|
||||
}
|
||||
|
||||
final byte options = in.readByte();
|
||||
isCompressed = (options & 0x01) == BLOCK_TYPE_COMPRESSED;
|
||||
hasChecksum = (options & 0x10) == BLOCK_WITH_CHECKSUM;
|
||||
|
||||
currentState = State.INIT_BLOCK_PARAMS;
|
||||
case INIT_BLOCK_PARAMS:
|
||||
if (in.readableBytes() < 2 + (isCompressed ? 2 : 0) + (hasChecksum ? 4 : 0)) {
|
||||
break;
|
||||
}
|
||||
currentChecksum = hasChecksum ? in.readInt() : 0;
|
||||
chunkLength = in.readUnsignedShort();
|
||||
originalLength = isCompressed ? in.readUnsignedShort() : chunkLength;
|
||||
|
||||
currentState = State.DECOMPRESS_DATA;
|
||||
case DECOMPRESS_DATA:
|
||||
final int chunkLength = this.chunkLength;
|
||||
if (in.readableBytes() < chunkLength) {
|
||||
break;
|
||||
}
|
||||
|
||||
final int idx = in.readerIndex();
|
||||
final int originalLength = this.originalLength;
|
||||
|
||||
final ByteBuf uncompressed;
|
||||
final byte[] output;
|
||||
final int outputPtr;
|
||||
|
||||
if (originalLength != 0) {
|
||||
uncompressed = ctx.alloc().heapBuffer(originalLength, originalLength);
|
||||
output = uncompressed.array();
|
||||
outputPtr = uncompressed.arrayOffset() + uncompressed.writerIndex();
|
||||
} else {
|
||||
uncompressed = null;
|
||||
output = EmptyArrays.EMPTY_BYTES;
|
||||
outputPtr = 0;
|
||||
}
|
||||
|
||||
boolean success = false;
|
||||
try {
|
||||
if (isCompressed) {
|
||||
final byte[] input;
|
||||
final int inputPtr;
|
||||
if (in.hasArray()) {
|
||||
input = in.array();
|
||||
inputPtr = in.arrayOffset() + idx;
|
||||
} else {
|
||||
input = new byte[chunkLength];
|
||||
in.getBytes(idx, input);
|
||||
inputPtr = 0;
|
||||
}
|
||||
|
||||
final int decompressedBytes = decompress(input, inputPtr, chunkLength,
|
||||
output, outputPtr, originalLength);
|
||||
if (originalLength != decompressedBytes) {
|
||||
throw new DecompressionException(String.format(
|
||||
"stream corrupted: originalLength(%d) and actual length(%d) mismatch",
|
||||
originalLength, decompressedBytes));
|
||||
}
|
||||
} else {
|
||||
in.getBytes(idx, output, outputPtr, chunkLength);
|
||||
}
|
||||
|
||||
final Checksum checksum = this.checksum;
|
||||
if (hasChecksum && checksum != null) {
|
||||
checksum.reset();
|
||||
checksum.update(output, outputPtr, originalLength);
|
||||
final int checksumResult = (int) checksum.getValue();
|
||||
if (checksumResult != currentChecksum) {
|
||||
throw new DecompressionException(String.format(
|
||||
"stream corrupted: mismatching checksum: %d (expected: %d)",
|
||||
checksumResult, currentChecksum));
|
||||
}
|
||||
}
|
||||
|
||||
if (uncompressed != null) {
|
||||
uncompressed.writerIndex(uncompressed.writerIndex() + originalLength);
|
||||
out.add(uncompressed);
|
||||
}
|
||||
in.skipBytes(chunkLength);
|
||||
|
||||
currentState = State.INIT_BLOCK;
|
||||
success = true;
|
||||
} finally {
|
||||
if (!success) {
|
||||
uncompressed.release();
|
||||
}
|
||||
}
|
||||
break;
|
||||
case CORRUPTED:
|
||||
in.skipBytes(in.readableBytes());
|
||||
break;
|
||||
default:
|
||||
throw new IllegalStateException();
|
||||
}
|
||||
} catch (Exception e) {
|
||||
currentState = State.CORRUPTED;
|
||||
throw e;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@ -148,149 +148,147 @@ public class Lz4FrameDecoder extends ByteToMessageDecoder {
|
||||
|
||||
@Override
|
||||
protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
|
||||
for (;;) {
|
||||
try {
|
||||
switch (currentState) {
|
||||
case INIT_BLOCK:
|
||||
if (in.readableBytes() < HEADER_LENGTH) {
|
||||
return;
|
||||
}
|
||||
final long magic = in.readLong();
|
||||
if (magic != MAGIC_NUMBER) {
|
||||
throw new DecompressionException("unexpected block identifier");
|
||||
try {
|
||||
switch (currentState) {
|
||||
case INIT_BLOCK:
|
||||
if (in.readableBytes() < HEADER_LENGTH) {
|
||||
break;
|
||||
}
|
||||
final long magic = in.readLong();
|
||||
if (magic != MAGIC_NUMBER) {
|
||||
throw new DecompressionException("unexpected block identifier");
|
||||
}
|
||||
|
||||
final int token = in.readByte();
|
||||
final int compressionLevel = (token & 0x0F) + COMPRESSION_LEVEL_BASE;
|
||||
int blockType = token & 0xF0;
|
||||
|
||||
int compressedLength = Integer.reverseBytes(in.readInt());
|
||||
if (compressedLength < 0 || compressedLength > MAX_BLOCK_SIZE) {
|
||||
throw new DecompressionException(String.format(
|
||||
"invalid compressedLength: %d (expected: 0-%d)",
|
||||
compressedLength, MAX_BLOCK_SIZE));
|
||||
}
|
||||
|
||||
int decompressedLength = Integer.reverseBytes(in.readInt());
|
||||
final int maxDecompressedLength = 1 << compressionLevel;
|
||||
if (decompressedLength < 0 || decompressedLength > maxDecompressedLength) {
|
||||
throw new DecompressionException(String.format(
|
||||
"invalid decompressedLength: %d (expected: 0-%d)",
|
||||
decompressedLength, maxDecompressedLength));
|
||||
}
|
||||
if (decompressedLength == 0 && compressedLength != 0
|
||||
|| decompressedLength != 0 && compressedLength == 0
|
||||
|| blockType == BLOCK_TYPE_NON_COMPRESSED && decompressedLength != compressedLength) {
|
||||
throw new DecompressionException(String.format(
|
||||
"stream corrupted: compressedLength(%d) and decompressedLength(%d) mismatch",
|
||||
compressedLength, decompressedLength));
|
||||
}
|
||||
|
||||
int currentChecksum = Integer.reverseBytes(in.readInt());
|
||||
if (decompressedLength == 0 && compressedLength == 0) {
|
||||
if (currentChecksum != 0) {
|
||||
throw new DecompressionException("stream corrupted: checksum error");
|
||||
}
|
||||
currentState = State.FINISHED;
|
||||
decompressor = null;
|
||||
checksum = null;
|
||||
break;
|
||||
}
|
||||
|
||||
this.blockType = blockType;
|
||||
this.compressedLength = compressedLength;
|
||||
this.decompressedLength = decompressedLength;
|
||||
this.currentChecksum = currentChecksum;
|
||||
|
||||
currentState = State.DECOMPRESS_DATA;
|
||||
case DECOMPRESS_DATA:
|
||||
blockType = this.blockType;
|
||||
compressedLength = this.compressedLength;
|
||||
decompressedLength = this.decompressedLength;
|
||||
currentChecksum = this.currentChecksum;
|
||||
|
||||
if (in.readableBytes() < compressedLength) {
|
||||
break;
|
||||
}
|
||||
|
||||
final int idx = in.readerIndex();
|
||||
|
||||
ByteBuf uncompressed = ctx.alloc().heapBuffer(decompressedLength, decompressedLength);
|
||||
final byte[] dest = uncompressed.array();
|
||||
final int destOff = uncompressed.arrayOffset() + uncompressed.writerIndex();
|
||||
|
||||
boolean success = false;
|
||||
try {
|
||||
switch (blockType) {
|
||||
case BLOCK_TYPE_NON_COMPRESSED: {
|
||||
in.getBytes(idx, dest, destOff, decompressedLength);
|
||||
break;
|
||||
}
|
||||
case BLOCK_TYPE_COMPRESSED: {
|
||||
final byte[] src;
|
||||
final int srcOff;
|
||||
if (in.hasArray()) {
|
||||
src = in.array();
|
||||
srcOff = in.arrayOffset() + idx;
|
||||
} else {
|
||||
src = new byte[compressedLength];
|
||||
in.getBytes(idx, src);
|
||||
srcOff = 0;
|
||||
}
|
||||
|
||||
final int token = in.readByte();
|
||||
final int compressionLevel = (token & 0x0F) + COMPRESSION_LEVEL_BASE;
|
||||
int blockType = token & 0xF0;
|
||||
|
||||
int compressedLength = Integer.reverseBytes(in.readInt());
|
||||
if (compressedLength < 0 || compressedLength > MAX_BLOCK_SIZE) {
|
||||
throw new DecompressionException(String.format(
|
||||
"invalid compressedLength: %d (expected: 0-%d)",
|
||||
compressedLength, MAX_BLOCK_SIZE));
|
||||
}
|
||||
|
||||
int decompressedLength = Integer.reverseBytes(in.readInt());
|
||||
final int maxDecompressedLength = 1 << compressionLevel;
|
||||
if (decompressedLength < 0 || decompressedLength > maxDecompressedLength) {
|
||||
throw new DecompressionException(String.format(
|
||||
"invalid decompressedLength: %d (expected: 0-%d)",
|
||||
decompressedLength, maxDecompressedLength));
|
||||
}
|
||||
if (decompressedLength == 0 && compressedLength != 0
|
||||
|| decompressedLength != 0 && compressedLength == 0
|
||||
|| blockType == BLOCK_TYPE_NON_COMPRESSED && decompressedLength != compressedLength) {
|
||||
throw new DecompressionException(String.format(
|
||||
"stream corrupted: compressedLength(%d) and decompressedLength(%d) mismatch",
|
||||
compressedLength, decompressedLength));
|
||||
}
|
||||
|
||||
int currentChecksum = Integer.reverseBytes(in.readInt());
|
||||
if (decompressedLength == 0 && compressedLength == 0) {
|
||||
if (currentChecksum != 0) {
|
||||
throw new DecompressionException("stream corrupted: checksum error");
|
||||
}
|
||||
currentState = State.FINISHED;
|
||||
decompressor = null;
|
||||
checksum = null;
|
||||
break;
|
||||
}
|
||||
|
||||
this.blockType = blockType;
|
||||
this.compressedLength = compressedLength;
|
||||
this.decompressedLength = decompressedLength;
|
||||
this.currentChecksum = currentChecksum;
|
||||
|
||||
currentState = State.DECOMPRESS_DATA;
|
||||
case DECOMPRESS_DATA:
|
||||
blockType = this.blockType;
|
||||
compressedLength = this.compressedLength;
|
||||
decompressedLength = this.decompressedLength;
|
||||
currentChecksum = this.currentChecksum;
|
||||
|
||||
if (in.readableBytes() < compressedLength) {
|
||||
return;
|
||||
}
|
||||
|
||||
final int idx = in.readerIndex();
|
||||
|
||||
ByteBuf uncompressed = ctx.alloc().heapBuffer(decompressedLength, decompressedLength);
|
||||
final byte[] dest = uncompressed.array();
|
||||
final int destOff = uncompressed.arrayOffset() + uncompressed.writerIndex();
|
||||
|
||||
boolean success = false;
|
||||
try {
|
||||
switch (blockType) {
|
||||
case BLOCK_TYPE_NON_COMPRESSED: {
|
||||
in.getBytes(idx, dest, destOff, decompressedLength);
|
||||
break;
|
||||
}
|
||||
case BLOCK_TYPE_COMPRESSED: {
|
||||
final byte[] src;
|
||||
final int srcOff;
|
||||
if (in.hasArray()) {
|
||||
src = in.array();
|
||||
srcOff = in.arrayOffset() + idx;
|
||||
} else {
|
||||
src = new byte[compressedLength];
|
||||
in.getBytes(idx, src);
|
||||
srcOff = 0;
|
||||
}
|
||||
|
||||
try {
|
||||
final int readBytes = decompressor.decompress(src, srcOff,
|
||||
dest, destOff, decompressedLength);
|
||||
if (compressedLength != readBytes) {
|
||||
throw new DecompressionException(String.format(
|
||||
"stream corrupted: compressedLength(%d) and actual length(%d) mismatch",
|
||||
compressedLength, readBytes));
|
||||
}
|
||||
} catch (LZ4Exception e) {
|
||||
throw new DecompressionException(e);
|
||||
}
|
||||
break;
|
||||
}
|
||||
default:
|
||||
throw new DecompressionException(String.format(
|
||||
"unexpected blockType: %d (expected: %d or %d)",
|
||||
blockType, BLOCK_TYPE_NON_COMPRESSED, BLOCK_TYPE_COMPRESSED));
|
||||
}
|
||||
|
||||
final Checksum checksum = this.checksum;
|
||||
if (checksum != null) {
|
||||
checksum.reset();
|
||||
checksum.update(dest, destOff, decompressedLength);
|
||||
final int checksumResult = (int) checksum.getValue();
|
||||
if (checksumResult != currentChecksum) {
|
||||
throw new DecompressionException(String.format(
|
||||
"stream corrupted: mismatching checksum: %d (expected: %d)",
|
||||
checksumResult, currentChecksum));
|
||||
}
|
||||
}
|
||||
uncompressed.writerIndex(uncompressed.writerIndex() + decompressedLength);
|
||||
out.add(uncompressed);
|
||||
in.skipBytes(compressedLength);
|
||||
|
||||
currentState = State.INIT_BLOCK;
|
||||
success = true;
|
||||
} finally {
|
||||
if (!success) {
|
||||
uncompressed.release();
|
||||
final int readBytes = decompressor.decompress(src, srcOff,
|
||||
dest, destOff, decompressedLength);
|
||||
if (compressedLength != readBytes) {
|
||||
throw new DecompressionException(String.format(
|
||||
"stream corrupted: compressedLength(%d) and actual length(%d) mismatch",
|
||||
compressedLength, readBytes));
|
||||
}
|
||||
} catch (LZ4Exception e) {
|
||||
throw new DecompressionException(e);
|
||||
}
|
||||
break;
|
||||
case FINISHED:
|
||||
case CORRUPTED:
|
||||
in.skipBytes(in.readableBytes());
|
||||
return;
|
||||
}
|
||||
default:
|
||||
throw new IllegalStateException();
|
||||
throw new DecompressionException(String.format(
|
||||
"unexpected blockType: %d (expected: %d or %d)",
|
||||
blockType, BLOCK_TYPE_NON_COMPRESSED, BLOCK_TYPE_COMPRESSED));
|
||||
}
|
||||
|
||||
final Checksum checksum = this.checksum;
|
||||
if (checksum != null) {
|
||||
checksum.reset();
|
||||
checksum.update(dest, destOff, decompressedLength);
|
||||
final int checksumResult = (int) checksum.getValue();
|
||||
if (checksumResult != currentChecksum) {
|
||||
throw new DecompressionException(String.format(
|
||||
"stream corrupted: mismatching checksum: %d (expected: %d)",
|
||||
checksumResult, currentChecksum));
|
||||
}
|
||||
}
|
||||
uncompressed.writerIndex(uncompressed.writerIndex() + decompressedLength);
|
||||
out.add(uncompressed);
|
||||
in.skipBytes(compressedLength);
|
||||
|
||||
currentState = State.INIT_BLOCK;
|
||||
success = true;
|
||||
} finally {
|
||||
if (!success) {
|
||||
uncompressed.release();
|
||||
}
|
||||
}
|
||||
} catch (Exception e) {
|
||||
currentState = State.CORRUPTED;
|
||||
throw e;
|
||||
break;
|
||||
case FINISHED:
|
||||
case CORRUPTED:
|
||||
in.skipBytes(in.readableBytes());
|
||||
break;
|
||||
default:
|
||||
throw new IllegalStateException();
|
||||
}
|
||||
} catch (Exception e) {
|
||||
currentState = State.CORRUPTED;
|
||||
throw e;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
@ -109,104 +109,102 @@ public class LzfDecoder extends ByteToMessageDecoder {
|
||||
|
||||
@Override
|
||||
protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
|
||||
for (;;) {
|
||||
try {
|
||||
switch (currentState) {
|
||||
case INIT_BLOCK:
|
||||
if (in.readableBytes() < HEADER_LEN_NOT_COMPRESSED) {
|
||||
return;
|
||||
}
|
||||
final int magic = in.readUnsignedShort();
|
||||
if (magic != MAGIC_NUMBER) {
|
||||
throw new DecompressionException("unexpected block identifier");
|
||||
}
|
||||
|
||||
final int type = in.readByte();
|
||||
switch (type) {
|
||||
case BLOCK_TYPE_NON_COMPRESSED:
|
||||
isCompressed = false;
|
||||
currentState = State.DECOMPRESS_DATA;
|
||||
break;
|
||||
case BLOCK_TYPE_COMPRESSED:
|
||||
isCompressed = true;
|
||||
currentState = State.INIT_ORIGINAL_LENGTH;
|
||||
break;
|
||||
default:
|
||||
throw new DecompressionException(String.format(
|
||||
"unknown type of chunk: %d (expected: %d or %d)",
|
||||
type, BLOCK_TYPE_NON_COMPRESSED, BLOCK_TYPE_COMPRESSED));
|
||||
}
|
||||
chunkLength = in.readUnsignedShort();
|
||||
|
||||
if (type != BLOCK_TYPE_COMPRESSED) {
|
||||
break;
|
||||
}
|
||||
case INIT_ORIGINAL_LENGTH:
|
||||
if (in.readableBytes() < 2) {
|
||||
return;
|
||||
}
|
||||
originalLength = in.readUnsignedShort();
|
||||
|
||||
currentState = State.DECOMPRESS_DATA;
|
||||
case DECOMPRESS_DATA:
|
||||
final int chunkLength = this.chunkLength;
|
||||
if (in.readableBytes() < chunkLength) {
|
||||
return;
|
||||
}
|
||||
final int originalLength = this.originalLength;
|
||||
|
||||
if (isCompressed) {
|
||||
final int idx = in.readerIndex();
|
||||
|
||||
final byte[] inputArray;
|
||||
final int inPos;
|
||||
if (in.hasArray()) {
|
||||
inputArray = in.array();
|
||||
inPos = in.arrayOffset() + idx;
|
||||
} else {
|
||||
inputArray = recycler.allocInputBuffer(chunkLength);
|
||||
in.getBytes(idx, inputArray, 0, chunkLength);
|
||||
inPos = 0;
|
||||
}
|
||||
|
||||
ByteBuf uncompressed = ctx.alloc().heapBuffer(originalLength, originalLength);
|
||||
final byte[] outputArray = uncompressed.array();
|
||||
final int outPos = uncompressed.arrayOffset() + uncompressed.writerIndex();
|
||||
|
||||
boolean success = false;
|
||||
try {
|
||||
decoder.decodeChunk(inputArray, inPos, outputArray, outPos, outPos + originalLength);
|
||||
uncompressed.writerIndex(uncompressed.writerIndex() + originalLength);
|
||||
out.add(uncompressed);
|
||||
in.skipBytes(chunkLength);
|
||||
success = true;
|
||||
} finally {
|
||||
if (!success) {
|
||||
uncompressed.release();
|
||||
}
|
||||
}
|
||||
|
||||
if (!in.hasArray()) {
|
||||
recycler.releaseInputBuffer(inputArray);
|
||||
}
|
||||
} else {
|
||||
out.add(in.readSlice(chunkLength).retain());
|
||||
}
|
||||
|
||||
currentState = State.INIT_BLOCK;
|
||||
break;
|
||||
case CORRUPTED:
|
||||
in.skipBytes(in.readableBytes());
|
||||
return;
|
||||
default:
|
||||
throw new IllegalStateException();
|
||||
try {
|
||||
switch (currentState) {
|
||||
case INIT_BLOCK:
|
||||
if (in.readableBytes() < HEADER_LEN_NOT_COMPRESSED) {
|
||||
break;
|
||||
}
|
||||
} catch (Exception e) {
|
||||
currentState = State.CORRUPTED;
|
||||
decoder = null;
|
||||
recycler = null;
|
||||
throw e;
|
||||
final int magic = in.readUnsignedShort();
|
||||
if (magic != MAGIC_NUMBER) {
|
||||
throw new DecompressionException("unexpected block identifier");
|
||||
}
|
||||
|
||||
final int type = in.readByte();
|
||||
switch (type) {
|
||||
case BLOCK_TYPE_NON_COMPRESSED:
|
||||
isCompressed = false;
|
||||
currentState = State.DECOMPRESS_DATA;
|
||||
break;
|
||||
case BLOCK_TYPE_COMPRESSED:
|
||||
isCompressed = true;
|
||||
currentState = State.INIT_ORIGINAL_LENGTH;
|
||||
break;
|
||||
default:
|
||||
throw new DecompressionException(String.format(
|
||||
"unknown type of chunk: %d (expected: %d or %d)",
|
||||
type, BLOCK_TYPE_NON_COMPRESSED, BLOCK_TYPE_COMPRESSED));
|
||||
}
|
||||
chunkLength = in.readUnsignedShort();
|
||||
|
||||
if (type != BLOCK_TYPE_COMPRESSED) {
|
||||
break;
|
||||
}
|
||||
case INIT_ORIGINAL_LENGTH:
|
||||
if (in.readableBytes() < 2) {
|
||||
break;
|
||||
}
|
||||
originalLength = in.readUnsignedShort();
|
||||
|
||||
currentState = State.DECOMPRESS_DATA;
|
||||
case DECOMPRESS_DATA:
|
||||
final int chunkLength = this.chunkLength;
|
||||
if (in.readableBytes() < chunkLength) {
|
||||
break;
|
||||
}
|
||||
final int originalLength = this.originalLength;
|
||||
|
||||
if (isCompressed) {
|
||||
final int idx = in.readerIndex();
|
||||
|
||||
final byte[] inputArray;
|
||||
final int inPos;
|
||||
if (in.hasArray()) {
|
||||
inputArray = in.array();
|
||||
inPos = in.arrayOffset() + idx;
|
||||
} else {
|
||||
inputArray = recycler.allocInputBuffer(chunkLength);
|
||||
in.getBytes(idx, inputArray, 0, chunkLength);
|
||||
inPos = 0;
|
||||
}
|
||||
|
||||
ByteBuf uncompressed = ctx.alloc().heapBuffer(originalLength, originalLength);
|
||||
final byte[] outputArray = uncompressed.array();
|
||||
final int outPos = uncompressed.arrayOffset() + uncompressed.writerIndex();
|
||||
|
||||
boolean success = false;
|
||||
try {
|
||||
decoder.decodeChunk(inputArray, inPos, outputArray, outPos, outPos + originalLength);
|
||||
uncompressed.writerIndex(uncompressed.writerIndex() + originalLength);
|
||||
out.add(uncompressed);
|
||||
in.skipBytes(chunkLength);
|
||||
success = true;
|
||||
} finally {
|
||||
if (!success) {
|
||||
uncompressed.release();
|
||||
}
|
||||
}
|
||||
|
||||
if (!in.hasArray()) {
|
||||
recycler.releaseInputBuffer(inputArray);
|
||||
}
|
||||
} else if (chunkLength > 0) {
|
||||
out.add(in.readSlice(chunkLength).retain());
|
||||
}
|
||||
|
||||
currentState = State.INIT_BLOCK;
|
||||
break;
|
||||
case CORRUPTED:
|
||||
in.skipBytes(in.readableBytes());
|
||||
break;
|
||||
default:
|
||||
throw new IllegalStateException();
|
||||
}
|
||||
} catch (Exception e) {
|
||||
currentState = State.CORRUPTED;
|
||||
decoder = null;
|
||||
recycler = null;
|
||||
throw e;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user