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Easy Redis Java client and Real-Time Data Platform. Valkey compatible. Sync/Async/RxJava3/Reactive API. Client side caching. Over 50 Redis based Java objects and services: JCache API, Apache Tomcat, Hibernate, Spring, Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Scheduler, RPC
/*
* Copyright 2014 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.handler.codec.compression;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;
import java.util.List;
import static io.netty.handler.codec.compression.Bzip2Constants.BASE_BLOCK_SIZE;
import static io.netty.handler.codec.compression.Bzip2Constants.BLOCK_HEADER_MAGIC_1;
import static io.netty.handler.codec.compression.Bzip2Constants.BLOCK_HEADER_MAGIC_2;
import static io.netty.handler.codec.compression.Bzip2Constants.END_OF_STREAM_MAGIC_1;
import static io.netty.handler.codec.compression.Bzip2Constants.END_OF_STREAM_MAGIC_2;
import static io.netty.handler.codec.compression.Bzip2Constants.HUFFMAN_MAXIMUM_TABLES;
import static io.netty.handler.codec.compression.Bzip2Constants.HUFFMAN_MAX_ALPHABET_SIZE;
import static io.netty.handler.codec.compression.Bzip2Constants.HUFFMAN_MINIMUM_TABLES;
import static io.netty.handler.codec.compression.Bzip2Constants.HUFFMAN_SELECTOR_LIST_MAX_LENGTH;
import static io.netty.handler.codec.compression.Bzip2Constants.HUFFMAN_SYMBOL_RANGE_SIZE;
import static io.netty.handler.codec.compression.Bzip2Constants.MAGIC_NUMBER;
import static io.netty.handler.codec.compression.Bzip2Constants.MAX_BLOCK_SIZE;
import static io.netty.handler.codec.compression.Bzip2Constants.MAX_SELECTORS;
import static io.netty.handler.codec.compression.Bzip2Constants.MIN_BLOCK_SIZE;
/**
* Uncompresses a {@link ByteBuf} encoded with the Bzip2 format.
*
* See Bzip2.
*/
public class Bzip2Decoder extends ByteToMessageDecoder {
/**
* Current state of stream.
*/
private enum State {
INIT,
INIT_BLOCK,
INIT_BLOCK_PARAMS,
RECEIVE_HUFFMAN_USED_MAP,
RECEIVE_HUFFMAN_USED_BITMAPS,
RECEIVE_SELECTORS_NUMBER,
RECEIVE_SELECTORS,
RECEIVE_HUFFMAN_LENGTH,
DECODE_HUFFMAN_DATA,
EOF
}
private State currentState = State.INIT;
/**
* A reader that provides bit-level reads.
*/
private final Bzip2BitReader reader = new Bzip2BitReader();
/**
* The decompressor for the current block.
*/
private Bzip2BlockDecompressor blockDecompressor;
/**
* Bzip2 Huffman coding stage.
*/
private Bzip2HuffmanStageDecoder huffmanStageDecoder;
/**
* Always: in the range 0 .. 9. The current block size is 100000 * this number.
*/
private int blockSize;
/**
* The CRC of the current block as read from the block header.
*/
private int blockCRC;
/**
* The merged CRC of all blocks decompressed so far.
*/
private int streamCRC;
@Override
protected void decode(ChannelHandlerContext ctx, ByteBuf in, List
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