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/*
* Copyright 2012 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.Snappy.validateChecksum;
/**
* Uncompresses a {@link ByteBuf} encoded with the Snappy framing format.
*
* See Snappy framing format.
*
* Note that by default, validation of the checksum header in each chunk is
* DISABLED for performance improvements. If performance is less of an issue,
* or if you would prefer the safety that checksum validation brings, please
* use the {@link #SnappyFrameDecoder(boolean)} constructor with the argument
* set to {@code true}.
*/
public class SnappyFrameDecoder extends ByteToMessageDecoder {
private enum ChunkType {
STREAM_IDENTIFIER,
COMPRESSED_DATA,
UNCOMPRESSED_DATA,
RESERVED_UNSKIPPABLE,
RESERVED_SKIPPABLE
}
private static final int SNAPPY_IDENTIFIER_LEN = 6;
// See https://github.org.apache.activemq.artemis.shaded.com.google/snappy/blob/1.1.9/framing_format.txt#L95
private static final int MAX_UNCOMPRESSED_DATA_SIZE = 65536 + 4;
// See https://github.org.apache.activemq.artemis.shaded.com.google/snappy/blob/1.1.9/framing_format.txt#L82
private static final int MAX_DECOMPRESSED_DATA_SIZE = 65536;
// See https://github.org.apache.activemq.artemis.shaded.com.google/snappy/blob/1.1.9/framing_format.txt#L82
private static final int MAX_COMPRESSED_CHUNK_SIZE = 16777216 - 1;
private final Snappy snappy = new Snappy();
private final boolean validateChecksums;
private boolean started;
private boolean corrupted;
private int numBytesToSkip;
/**
* Creates a new snappy-framed decoder with validation of checksums
* turned OFF. To turn checksum validation on, please use the alternate
* {@link #SnappyFrameDecoder(boolean)} constructor.
*/
public SnappyFrameDecoder() {
this(false);
}
/**
* Creates a new snappy-framed decoder with validation of checksums
* as specified.
*
* @param validateChecksums
* If true, the checksum field will be validated against the actual
* uncompressed data, and if the checksums do not match, a suitable
* {@link DecompressionException} will be thrown
*/
public SnappyFrameDecoder(boolean validateChecksums) {
this.validateChecksums = validateChecksums;
}
@Override
protected void decode(ChannelHandlerContext ctx, ByteBuf in, List