Bzip2Encoder.java — netty Source File

Source Code

/*
 * 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.ChannelFuture;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.ChannelPromise;
import io.netty.handler.codec.MessageToByteEncoder;
import io.netty.util.concurrent.EventExecutor;
import io.netty.util.concurrent.PromiseNotifier;

import static io.netty.handler.codec.compression.Bzip2Constants.BASE_BLOCK_SIZE;
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.MAGIC_NUMBER;
import static io.netty.handler.codec.compression.Bzip2Constants.MAX_BLOCK_SIZE;
import static io.netty.handler.codec.compression.Bzip2Constants.MIN_BLOCK_SIZE;

/**
 * Compresses a {@link ByteBuf} using the Bzip2 algorithm.
 *
 * See <a href="https://en.wikipedia.org/wiki/Bzip2">Bzip2</a>.
 */
public class Bzip2Encoder extends MessageToByteEncoder<ByteBuf> {
    /**
     * Current state of stream.
     */
    private enum State {
        INIT,
        INIT_BLOCK,
        WRITE_DATA,
        CLOSE_BLOCK
    }

    private State currentState = State.INIT;

    /**
     * A writer that provides bit-level writes.
     */
    private final Bzip2BitWriter writer = new Bzip2BitWriter();

    /**
     * The declared maximum block size of the stream (before final run-length decoding).
     */
    private final int streamBlockSize;
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