Rename SnappyFramedEncoder/Decoder to SnappyFrameEncoder/Decoder
Related issue: #2766 Motivation: Forgot to rename them before the final release by mistake. Modifications: Rename and then re-introduce the deprecated version that extends the renamed class. Result: Better naming
This commit is contained in:
parent
c8841bc9de
commit
1971bd1da6
@ -0,0 +1,212 @@
|
||||
/*
|
||||
* 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:
|
||||
*
|
||||
* http://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.ByteBufUtil;
|
||||
import io.netty.channel.ChannelHandlerContext;
|
||||
import io.netty.handler.codec.ByteToMessageDecoder;
|
||||
|
||||
import java.util.Arrays;
|
||||
import java.util.List;
|
||||
|
||||
import static io.netty.handler.codec.compression.Snappy.*;
|
||||
|
||||
/**
|
||||
* Uncompresses a {@link ByteBuf} encoded with the Snappy framing format.
|
||||
*
|
||||
* See http://code.google.com/p/snappy/source/browse/trunk/framing_format.txt
|
||||
*
|
||||
* 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 byte[] SNAPPY = { 's', 'N', 'a', 'P', 'p', 'Y' };
|
||||
private static final int MAX_UNCOMPRESSED_DATA_SIZE = 65536 + 4;
|
||||
|
||||
private final Snappy snappy = new Snappy();
|
||||
private final boolean validateChecksums;
|
||||
|
||||
private boolean started;
|
||||
private boolean corrupted;
|
||||
|
||||
/**
|
||||
* 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<Object> out) throws Exception {
|
||||
if (corrupted) {
|
||||
in.skipBytes(in.readableBytes());
|
||||
return;
|
||||
}
|
||||
|
||||
try {
|
||||
int idx = in.readerIndex();
|
||||
final int inSize = in.readableBytes();
|
||||
if (inSize < 4) {
|
||||
// We need to be at least able to read the chunk type identifier (one byte),
|
||||
// and the length of the chunk (3 bytes) in order to proceed
|
||||
return;
|
||||
}
|
||||
|
||||
final int chunkTypeVal = in.getUnsignedByte(idx);
|
||||
final ChunkType chunkType = mapChunkType((byte) chunkTypeVal);
|
||||
final int chunkLength = ByteBufUtil.swapMedium(in.getUnsignedMedium(idx + 1));
|
||||
|
||||
switch (chunkType) {
|
||||
case STREAM_IDENTIFIER:
|
||||
if (chunkLength != SNAPPY.length) {
|
||||
throw new DecompressionException("Unexpected length of stream identifier: " + chunkLength);
|
||||
}
|
||||
|
||||
if (inSize < 4 + SNAPPY.length) {
|
||||
break;
|
||||
}
|
||||
|
||||
byte[] identifier = new byte[chunkLength];
|
||||
in.skipBytes(4).readBytes(identifier);
|
||||
|
||||
if (!Arrays.equals(identifier, SNAPPY)) {
|
||||
throw new DecompressionException("Unexpected stream identifier contents. Mismatched snappy " +
|
||||
"protocol version?");
|
||||
}
|
||||
|
||||
started = true;
|
||||
break;
|
||||
case RESERVED_SKIPPABLE:
|
||||
if (!started) {
|
||||
throw new DecompressionException("Received RESERVED_SKIPPABLE tag before STREAM_IDENTIFIER");
|
||||
}
|
||||
|
||||
if (inSize < 4 + chunkLength) {
|
||||
// TODO: Don't keep skippable bytes
|
||||
return;
|
||||
}
|
||||
|
||||
in.skipBytes(4 + chunkLength);
|
||||
break;
|
||||
case RESERVED_UNSKIPPABLE:
|
||||
// The spec mandates that reserved unskippable chunks must immediately
|
||||
// return an error, as we must assume that we cannot decode the stream
|
||||
// correctly
|
||||
throw new DecompressionException(
|
||||
"Found reserved unskippable chunk type: 0x" + Integer.toHexString(chunkTypeVal));
|
||||
case UNCOMPRESSED_DATA:
|
||||
if (!started) {
|
||||
throw new DecompressionException("Received UNCOMPRESSED_DATA tag before STREAM_IDENTIFIER");
|
||||
}
|
||||
if (chunkLength > MAX_UNCOMPRESSED_DATA_SIZE) {
|
||||
throw new DecompressionException("Received UNCOMPRESSED_DATA larger than 65540 bytes");
|
||||
}
|
||||
|
||||
if (inSize < 4 + chunkLength) {
|
||||
return;
|
||||
}
|
||||
|
||||
in.skipBytes(4);
|
||||
if (validateChecksums) {
|
||||
int checksum = ByteBufUtil.swapInt(in.readInt());
|
||||
validateChecksum(checksum, in, in.readerIndex(), chunkLength - 4);
|
||||
} else {
|
||||
in.skipBytes(4);
|
||||
}
|
||||
out.add(in.readSlice(chunkLength - 4).retain());
|
||||
break;
|
||||
case COMPRESSED_DATA:
|
||||
if (!started) {
|
||||
throw new DecompressionException("Received COMPRESSED_DATA tag before STREAM_IDENTIFIER");
|
||||
}
|
||||
|
||||
if (inSize < 4 + chunkLength) {
|
||||
return;
|
||||
}
|
||||
|
||||
in.skipBytes(4);
|
||||
int checksum = ByteBufUtil.swapInt(in.readInt());
|
||||
ByteBuf uncompressed = ctx.alloc().buffer(0);
|
||||
if (validateChecksums) {
|
||||
int oldWriterIndex = in.writerIndex();
|
||||
try {
|
||||
in.writerIndex(in.readerIndex() + chunkLength - 4);
|
||||
snappy.decode(in, uncompressed);
|
||||
} finally {
|
||||
in.writerIndex(oldWriterIndex);
|
||||
}
|
||||
validateChecksum(checksum, uncompressed, 0, uncompressed.writerIndex());
|
||||
} else {
|
||||
snappy.decode(in.readSlice(chunkLength - 4), uncompressed);
|
||||
}
|
||||
out.add(uncompressed);
|
||||
snappy.reset();
|
||||
break;
|
||||
}
|
||||
} catch (Exception e) {
|
||||
corrupted = true;
|
||||
throw e;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Decodes the chunk type from the type tag byte.
|
||||
*
|
||||
* @param type The tag byte extracted from the stream
|
||||
* @return The appropriate {@link ChunkType}, defaulting to {@link ChunkType#RESERVED_UNSKIPPABLE}
|
||||
*/
|
||||
private static ChunkType mapChunkType(byte type) {
|
||||
if (type == 0) {
|
||||
return ChunkType.COMPRESSED_DATA;
|
||||
} else if (type == 1) {
|
||||
return ChunkType.UNCOMPRESSED_DATA;
|
||||
} else if (type == (byte) 0xff) {
|
||||
return ChunkType.STREAM_IDENTIFIER;
|
||||
} else if ((type & 0x80) == 0x80) {
|
||||
return ChunkType.RESERVED_SKIPPABLE;
|
||||
} else {
|
||||
return ChunkType.RESERVED_UNSKIPPABLE;
|
||||
}
|
||||
}
|
||||
}
|
@ -0,0 +1,124 @@
|
||||
/*
|
||||
* 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:
|
||||
*
|
||||
* http://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.ByteBufUtil;
|
||||
import io.netty.channel.ChannelHandlerContext;
|
||||
import io.netty.handler.codec.MessageToByteEncoder;
|
||||
|
||||
import static io.netty.handler.codec.compression.Snappy.*;
|
||||
|
||||
/**
|
||||
* Compresses a {@link ByteBuf} using the Snappy framing format.
|
||||
*
|
||||
* See http://code.google.com/p/snappy/source/browse/trunk/framing_format.txt
|
||||
*/
|
||||
public class SnappyFrameEncoder extends MessageToByteEncoder<ByteBuf> {
|
||||
/**
|
||||
* The minimum amount that we'll consider actually attempting to compress.
|
||||
* This value is preamble + the minimum length our Snappy service will
|
||||
* compress (instead of just emitting a literal).
|
||||
*/
|
||||
private static final int MIN_COMPRESSIBLE_LENGTH = 18;
|
||||
|
||||
/**
|
||||
* All streams should start with the "Stream identifier", containing chunk
|
||||
* type 0xff, a length field of 0x6, and 'sNaPpY' in ASCII.
|
||||
*/
|
||||
private static final byte[] STREAM_START = {
|
||||
(byte) 0xff, 0x06, 0x00, 0x00, 0x73, 0x4e, 0x61, 0x50, 0x70, 0x59
|
||||
};
|
||||
|
||||
private final Snappy snappy = new Snappy();
|
||||
private boolean started;
|
||||
|
||||
@Override
|
||||
protected void encode(ChannelHandlerContext ctx, ByteBuf in, ByteBuf out) throws Exception {
|
||||
if (!in.isReadable()) {
|
||||
return;
|
||||
}
|
||||
|
||||
if (!started) {
|
||||
started = true;
|
||||
out.writeBytes(STREAM_START);
|
||||
}
|
||||
|
||||
int dataLength = in.readableBytes();
|
||||
if (dataLength > MIN_COMPRESSIBLE_LENGTH) {
|
||||
for (;;) {
|
||||
final int lengthIdx = out.writerIndex() + 1;
|
||||
if (dataLength < MIN_COMPRESSIBLE_LENGTH) {
|
||||
ByteBuf slice = in.readSlice(dataLength);
|
||||
writeUnencodedChunk(slice, out, dataLength);
|
||||
break;
|
||||
}
|
||||
|
||||
out.writeInt(0);
|
||||
if (dataLength > Short.MAX_VALUE) {
|
||||
ByteBuf slice = in.readSlice(Short.MAX_VALUE);
|
||||
calculateAndWriteChecksum(slice, out);
|
||||
snappy.encode(slice, out, Short.MAX_VALUE);
|
||||
setChunkLength(out, lengthIdx);
|
||||
dataLength -= Short.MAX_VALUE;
|
||||
} else {
|
||||
ByteBuf slice = in.readSlice(dataLength);
|
||||
calculateAndWriteChecksum(slice, out);
|
||||
snappy.encode(slice, out, dataLength);
|
||||
setChunkLength(out, lengthIdx);
|
||||
break;
|
||||
}
|
||||
}
|
||||
} else {
|
||||
writeUnencodedChunk(in, out, dataLength);
|
||||
}
|
||||
}
|
||||
|
||||
private static void writeUnencodedChunk(ByteBuf in, ByteBuf out, int dataLength) {
|
||||
out.writeByte(1);
|
||||
writeChunkLength(out, dataLength + 4);
|
||||
calculateAndWriteChecksum(in, out);
|
||||
out.writeBytes(in, dataLength);
|
||||
}
|
||||
|
||||
private static void setChunkLength(ByteBuf out, int lengthIdx) {
|
||||
int chunkLength = out.writerIndex() - lengthIdx - 3;
|
||||
if (chunkLength >>> 24 != 0) {
|
||||
throw new CompressionException("compressed data too large: " + chunkLength);
|
||||
}
|
||||
out.setMedium(lengthIdx, ByteBufUtil.swapMedium(chunkLength));
|
||||
}
|
||||
|
||||
/**
|
||||
* Writes the 2-byte chunk length to the output buffer.
|
||||
*
|
||||
* @param out The buffer to write to
|
||||
* @param chunkLength The length to write
|
||||
*/
|
||||
private static void writeChunkLength(ByteBuf out, int chunkLength) {
|
||||
out.writeMedium(ByteBufUtil.swapMedium(chunkLength));
|
||||
}
|
||||
|
||||
/**
|
||||
* Calculates and writes the 4-byte checksum to the output buffer
|
||||
*
|
||||
* @param slice The data to calculate the checksum for
|
||||
* @param out The output buffer to write the checksum to
|
||||
*/
|
||||
private static void calculateAndWriteChecksum(ByteBuf slice, ByteBuf out) {
|
||||
out.writeInt(ByteBufUtil.swapInt(calculateChecksum(slice)));
|
||||
}
|
||||
}
|
@ -1,5 +1,5 @@
|
||||
/*
|
||||
* Copyright 2012 The Netty Project
|
||||
* 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
|
||||
@ -13,199 +13,13 @@
|
||||
* License for the specific language governing permissions and limitations
|
||||
* under the License.
|
||||
*/
|
||||
|
||||
package io.netty.handler.codec.compression;
|
||||
|
||||
import static io.netty.handler.codec.compression.Snappy.validateChecksum;
|
||||
import io.netty.buffer.ByteBuf;
|
||||
import io.netty.buffer.ByteBufUtil;
|
||||
import io.netty.channel.ChannelHandlerContext;
|
||||
import io.netty.handler.codec.ByteToMessageDecoder;
|
||||
|
||||
import java.util.Arrays;
|
||||
import java.util.List;
|
||||
|
||||
/**
|
||||
* Uncompresses a {@link ByteBuf} encoded with the Snappy framing format.
|
||||
*
|
||||
* See http://code.google.com/p/snappy/source/browse/trunk/framing_format.txt
|
||||
*
|
||||
* 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 #SnappyFramedDecoder(boolean)} constructor with the argument
|
||||
* set to {@code true}.
|
||||
* @deprecated Use {@link SnappyFrameDecoder} instead.
|
||||
*/
|
||||
public class SnappyFramedDecoder extends ByteToMessageDecoder {
|
||||
|
||||
private enum ChunkType {
|
||||
STREAM_IDENTIFIER,
|
||||
COMPRESSED_DATA,
|
||||
UNCOMPRESSED_DATA,
|
||||
RESERVED_UNSKIPPABLE,
|
||||
RESERVED_SKIPPABLE
|
||||
}
|
||||
|
||||
private static final byte[] SNAPPY = { 's', 'N', 'a', 'P', 'p', 'Y' };
|
||||
private static final int MAX_UNCOMPRESSED_DATA_SIZE = 65536 + 4;
|
||||
|
||||
private final Snappy snappy = new Snappy();
|
||||
private final boolean validateChecksums;
|
||||
|
||||
private boolean started;
|
||||
private boolean corrupted;
|
||||
|
||||
/**
|
||||
* Creates a new snappy-framed decoder with validation of checksums
|
||||
* turned OFF. To turn checksum validation on, please use the alternate
|
||||
* {@link #SnappyFramedDecoder(boolean)} constructor.
|
||||
*/
|
||||
public SnappyFramedDecoder() {
|
||||
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 SnappyFramedDecoder(boolean validateChecksums) {
|
||||
this.validateChecksums = validateChecksums;
|
||||
}
|
||||
|
||||
@Override
|
||||
protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
|
||||
if (corrupted) {
|
||||
in.skipBytes(in.readableBytes());
|
||||
return;
|
||||
}
|
||||
|
||||
try {
|
||||
int idx = in.readerIndex();
|
||||
final int inSize = in.readableBytes();
|
||||
if (inSize < 4) {
|
||||
// We need to be at least able to read the chunk type identifier (one byte),
|
||||
// and the length of the chunk (3 bytes) in order to proceed
|
||||
return;
|
||||
}
|
||||
|
||||
final int chunkTypeVal = in.getUnsignedByte(idx);
|
||||
final ChunkType chunkType = mapChunkType((byte) chunkTypeVal);
|
||||
final int chunkLength = ByteBufUtil.swapMedium(in.getUnsignedMedium(idx + 1));
|
||||
|
||||
switch (chunkType) {
|
||||
case STREAM_IDENTIFIER:
|
||||
if (chunkLength != SNAPPY.length) {
|
||||
throw new DecompressionException("Unexpected length of stream identifier: " + chunkLength);
|
||||
}
|
||||
|
||||
if (inSize < 4 + SNAPPY.length) {
|
||||
break;
|
||||
}
|
||||
|
||||
byte[] identifier = new byte[chunkLength];
|
||||
in.skipBytes(4).readBytes(identifier);
|
||||
|
||||
if (!Arrays.equals(identifier, SNAPPY)) {
|
||||
throw new DecompressionException("Unexpected stream identifier contents. Mismatched snappy " +
|
||||
"protocol version?");
|
||||
}
|
||||
|
||||
started = true;
|
||||
break;
|
||||
case RESERVED_SKIPPABLE:
|
||||
if (!started) {
|
||||
throw new DecompressionException("Received RESERVED_SKIPPABLE tag before STREAM_IDENTIFIER");
|
||||
}
|
||||
|
||||
if (inSize < 4 + chunkLength) {
|
||||
// TODO: Don't keep skippable bytes
|
||||
return;
|
||||
}
|
||||
|
||||
in.skipBytes(4 + chunkLength);
|
||||
break;
|
||||
case RESERVED_UNSKIPPABLE:
|
||||
// The spec mandates that reserved unskippable chunks must immediately
|
||||
// return an error, as we must assume that we cannot decode the stream
|
||||
// correctly
|
||||
throw new DecompressionException(
|
||||
"Found reserved unskippable chunk type: 0x" + Integer.toHexString(chunkTypeVal));
|
||||
case UNCOMPRESSED_DATA:
|
||||
if (!started) {
|
||||
throw new DecompressionException("Received UNCOMPRESSED_DATA tag before STREAM_IDENTIFIER");
|
||||
}
|
||||
if (chunkLength > MAX_UNCOMPRESSED_DATA_SIZE) {
|
||||
throw new DecompressionException("Received UNCOMPRESSED_DATA larger than 65540 bytes");
|
||||
}
|
||||
|
||||
if (inSize < 4 + chunkLength) {
|
||||
return;
|
||||
}
|
||||
|
||||
in.skipBytes(4);
|
||||
if (validateChecksums) {
|
||||
int checksum = ByteBufUtil.swapInt(in.readInt());
|
||||
validateChecksum(checksum, in, in.readerIndex(), chunkLength - 4);
|
||||
} else {
|
||||
in.skipBytes(4);
|
||||
}
|
||||
out.add(in.readSlice(chunkLength - 4).retain());
|
||||
break;
|
||||
case COMPRESSED_DATA:
|
||||
if (!started) {
|
||||
throw new DecompressionException("Received COMPRESSED_DATA tag before STREAM_IDENTIFIER");
|
||||
}
|
||||
|
||||
if (inSize < 4 + chunkLength) {
|
||||
return;
|
||||
}
|
||||
|
||||
in.skipBytes(4);
|
||||
int checksum = ByteBufUtil.swapInt(in.readInt());
|
||||
ByteBuf uncompressed = ctx.alloc().buffer(0);
|
||||
if (validateChecksums) {
|
||||
int oldWriterIndex = in.writerIndex();
|
||||
try {
|
||||
in.writerIndex(in.readerIndex() + chunkLength - 4);
|
||||
snappy.decode(in, uncompressed);
|
||||
} finally {
|
||||
in.writerIndex(oldWriterIndex);
|
||||
}
|
||||
validateChecksum(checksum, uncompressed, 0, uncompressed.writerIndex());
|
||||
} else {
|
||||
snappy.decode(in.readSlice(chunkLength - 4), uncompressed);
|
||||
}
|
||||
out.add(uncompressed);
|
||||
snappy.reset();
|
||||
break;
|
||||
}
|
||||
} catch (Exception e) {
|
||||
corrupted = true;
|
||||
throw e;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Decodes the chunk type from the type tag byte.
|
||||
*
|
||||
* @param type The tag byte extracted from the stream
|
||||
* @return The appropriate {@link ChunkType}, defaulting to {@link ChunkType#RESERVED_UNSKIPPABLE}
|
||||
*/
|
||||
private static ChunkType mapChunkType(byte type) {
|
||||
if (type == 0) {
|
||||
return ChunkType.COMPRESSED_DATA;
|
||||
} else if (type == 1) {
|
||||
return ChunkType.UNCOMPRESSED_DATA;
|
||||
} else if (type == (byte) 0xff) {
|
||||
return ChunkType.STREAM_IDENTIFIER;
|
||||
} else if ((type & 0x80) == 0x80) {
|
||||
return ChunkType.RESERVED_SKIPPABLE;
|
||||
} else {
|
||||
return ChunkType.RESERVED_UNSKIPPABLE;
|
||||
}
|
||||
}
|
||||
@Deprecated
|
||||
public class SnappyFramedDecoder extends SnappyFrameDecoder {
|
||||
// Nothing new. Just stting here for backward compatibility.
|
||||
}
|
||||
|
@ -1,5 +1,5 @@
|
||||
/*
|
||||
* Copyright 2012 The Netty Project
|
||||
* 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
|
||||
@ -13,112 +13,13 @@
|
||||
* 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.ByteBufUtil;
|
||||
import io.netty.channel.ChannelHandlerContext;
|
||||
import io.netty.handler.codec.MessageToByteEncoder;
|
||||
|
||||
import static io.netty.handler.codec.compression.Snappy.*;
|
||||
|
||||
/**
|
||||
* Compresses a {@link ByteBuf} using the Snappy framing format.
|
||||
*
|
||||
* See http://code.google.com/p/snappy/source/browse/trunk/framing_format.txt
|
||||
* @deprecated Use {@link SnappyFrameEncoder} instead.
|
||||
*/
|
||||
public class SnappyFramedEncoder extends MessageToByteEncoder<ByteBuf> {
|
||||
/**
|
||||
* The minimum amount that we'll consider actually attempting to compress.
|
||||
* This value is preamble + the minimum length our Snappy service will
|
||||
* compress (instead of just emitting a literal).
|
||||
*/
|
||||
private static final int MIN_COMPRESSIBLE_LENGTH = 18;
|
||||
|
||||
/**
|
||||
* All streams should start with the "Stream identifier", containing chunk
|
||||
* type 0xff, a length field of 0x6, and 'sNaPpY' in ASCII.
|
||||
*/
|
||||
private static final byte[] STREAM_START = {
|
||||
(byte) 0xff, 0x06, 0x00, 0x00, 0x73, 0x4e, 0x61, 0x50, 0x70, 0x59
|
||||
};
|
||||
|
||||
private final Snappy snappy = new Snappy();
|
||||
private boolean started;
|
||||
|
||||
@Override
|
||||
protected void encode(ChannelHandlerContext ctx, ByteBuf in, ByteBuf out) throws Exception {
|
||||
if (!in.isReadable()) {
|
||||
return;
|
||||
}
|
||||
|
||||
if (!started) {
|
||||
started = true;
|
||||
out.writeBytes(STREAM_START);
|
||||
}
|
||||
|
||||
int dataLength = in.readableBytes();
|
||||
if (dataLength > MIN_COMPRESSIBLE_LENGTH) {
|
||||
for (;;) {
|
||||
final int lengthIdx = out.writerIndex() + 1;
|
||||
if (dataLength < MIN_COMPRESSIBLE_LENGTH) {
|
||||
ByteBuf slice = in.readSlice(dataLength);
|
||||
writeUnencodedChunk(slice, out, dataLength);
|
||||
break;
|
||||
}
|
||||
|
||||
out.writeInt(0);
|
||||
if (dataLength > Short.MAX_VALUE) {
|
||||
ByteBuf slice = in.readSlice(Short.MAX_VALUE);
|
||||
calculateAndWriteChecksum(slice, out);
|
||||
snappy.encode(slice, out, Short.MAX_VALUE);
|
||||
setChunkLength(out, lengthIdx);
|
||||
dataLength -= Short.MAX_VALUE;
|
||||
} else {
|
||||
ByteBuf slice = in.readSlice(dataLength);
|
||||
calculateAndWriteChecksum(slice, out);
|
||||
snappy.encode(slice, out, dataLength);
|
||||
setChunkLength(out, lengthIdx);
|
||||
break;
|
||||
}
|
||||
}
|
||||
} else {
|
||||
writeUnencodedChunk(in, out, dataLength);
|
||||
}
|
||||
}
|
||||
|
||||
private static void writeUnencodedChunk(ByteBuf in, ByteBuf out, int dataLength) {
|
||||
out.writeByte(1);
|
||||
writeChunkLength(out, dataLength + 4);
|
||||
calculateAndWriteChecksum(in, out);
|
||||
out.writeBytes(in, dataLength);
|
||||
}
|
||||
|
||||
private static void setChunkLength(ByteBuf out, int lengthIdx) {
|
||||
int chunkLength = out.writerIndex() - lengthIdx - 3;
|
||||
if (chunkLength >>> 24 != 0) {
|
||||
throw new CompressionException("compressed data too large: " + chunkLength);
|
||||
}
|
||||
out.setMedium(lengthIdx, ByteBufUtil.swapMedium(chunkLength));
|
||||
}
|
||||
|
||||
/**
|
||||
* Writes the 2-byte chunk length to the output buffer.
|
||||
*
|
||||
* @param out The buffer to write to
|
||||
* @param chunkLength The length to write
|
||||
*/
|
||||
private static void writeChunkLength(ByteBuf out, int chunkLength) {
|
||||
out.writeMedium(ByteBufUtil.swapMedium(chunkLength));
|
||||
}
|
||||
|
||||
/**
|
||||
* Calculates and writes the 4-byte checksum to the output buffer
|
||||
*
|
||||
* @param slice The data to calculate the checksum for
|
||||
* @param out The output buffer to write the checksum to
|
||||
*/
|
||||
private static void calculateAndWriteChecksum(ByteBuf slice, ByteBuf out) {
|
||||
out.writeInt(ByteBufUtil.swapInt(calculateChecksum(slice)));
|
||||
}
|
||||
@Deprecated
|
||||
public class SnappyFramedEncoder extends SnappyFrameEncoder {
|
||||
// Nothing new. Just stting here for backward compatibility.
|
||||
}
|
||||
|
@ -24,12 +24,12 @@ import org.junit.Test;
|
||||
import static io.netty.util.ReferenceCountUtil.releaseLater;
|
||||
import static org.junit.Assert.*;
|
||||
|
||||
public class SnappyFramedDecoderTest {
|
||||
public class SnappyFrameDecoderTest {
|
||||
private EmbeddedChannel channel;
|
||||
|
||||
@Before
|
||||
public void initChannel() {
|
||||
channel = new EmbeddedChannel(new SnappyFramedDecoder());
|
||||
channel = new EmbeddedChannel(new SnappyFrameDecoder());
|
||||
}
|
||||
|
||||
@Test(expected = DecompressionException.class)
|
||||
@ -133,7 +133,7 @@ public class SnappyFramedDecoderTest {
|
||||
|
||||
@Test(expected = DecompressionException.class)
|
||||
public void testInvalidChecksumThrowsException() throws Exception {
|
||||
EmbeddedChannel channel = new EmbeddedChannel(new SnappyFramedDecoder(true));
|
||||
EmbeddedChannel channel = new EmbeddedChannel(new SnappyFrameDecoder(true));
|
||||
|
||||
// checksum here is presented as 0
|
||||
ByteBuf in = Unpooled.wrappedBuffer(new byte[] {
|
||||
@ -146,7 +146,7 @@ public class SnappyFramedDecoderTest {
|
||||
|
||||
@Test
|
||||
public void testInvalidChecksumDoesNotThrowException() throws Exception {
|
||||
EmbeddedChannel channel = new EmbeddedChannel(new SnappyFramedDecoder(true));
|
||||
EmbeddedChannel channel = new EmbeddedChannel(new SnappyFrameDecoder(true));
|
||||
|
||||
// checksum here is presented as a282986f (little endian)
|
||||
ByteBuf in = Unpooled.wrappedBuffer(new byte[] {
|
@ -25,12 +25,12 @@ import org.junit.Test;
|
||||
import static io.netty.util.ReferenceCountUtil.*;
|
||||
import static org.junit.Assert.*;
|
||||
|
||||
public class SnappyFramedEncoderTest {
|
||||
public class SnappyFrameEncoderTest {
|
||||
private EmbeddedChannel channel;
|
||||
|
||||
@Before
|
||||
public void setUp() {
|
||||
channel = new EmbeddedChannel(new SnappyFramedEncoder());
|
||||
channel = new EmbeddedChannel(new SnappyFrameEncoder());
|
||||
}
|
||||
|
||||
@Test
|
@ -33,12 +33,12 @@ public class SnappyIntegrationTest extends IntegrationTest {
|
||||
|
||||
@Override
|
||||
protected EmbeddedChannel createEncoderEmbeddedChannel() {
|
||||
return new EmbeddedChannel(new SnappyFramedEncoder());
|
||||
return new EmbeddedChannel(new SnappyFrameEncoder());
|
||||
}
|
||||
|
||||
@Override
|
||||
protected EmbeddedChannel createDecoderEmbeddedChannel() {
|
||||
return new EmbeddedChannel(new SnappyFramedDecoder());
|
||||
return new EmbeddedChannel(new SnappyFrameDecoder());
|
||||
}
|
||||
|
||||
@Test
|
||||
|
Loading…
Reference in New Issue
Block a user