JdkZlibDecoder.java — netty Source File

Source Code

/*
 * Copyright 2013 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.buffer.ByteBufAllocator;
import io.netty.channel.ChannelHandlerContext;
import io.netty.util.internal.ObjectUtil;

import java.util.List;
import java.util.zip.CRC32;
import java.util.zip.DataFormatException;
import java.util.zip.Deflater;
import java.util.zip.Inflater;

/**
 * Decompress a {@link ByteBuf} using the inflate algorithm.
 */
public class JdkZlibDecoder extends ZlibDecoder {
    private static final int FHCRC = 0x02;
    private static final int FEXTRA = 0x04;
    private static final int FNAME = 0x08;
    private static final int FCOMMENT = 0x10;
    private static final int FRESERVED = 0xE0;

    private Inflater inflater;
    private final byte[] dictionary;

    // GZIP related
    private final ByteBufChecksum crc;
    private final boolean decompressConcatenated;

    private enum GzipState {
        HEADER_START,
        HEADER_END,
        FLG_READ,
        XLEN_READ,
        SKIP_FNAME,
        SKIP_COMMENT,
        PROCESS_FHCRC,
        FOOTER_START,
    }

    private GzipState gzipState = GzipState.HEADER_START;
    private int flags = -1;
    private int xlen = -1;
    private boolean needsRead;
// ... (485 more lines)