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Lz4Codec.java
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138 lines (117 loc) · 4.19 KB
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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 org.apache.orc.impl;
import net.jpountz.lz4.LZ4Compressor;
import net.jpountz.lz4.LZ4Factory;
import net.jpountz.lz4.LZ4SafeDecompressor;
import org.apache.orc.CompressionCodec;
import org.apache.orc.CompressionKind;
import java.io.IOException;
import java.nio.ByteBuffer;
/**
* @since 2.3.0
*/
public class Lz4Codec implements CompressionCodec, DirectDecompressionCodec {
private static final LZ4Factory lz4Factory = LZ4Factory.fastestInstance();
private static final ThreadLocal<byte[]> threadBuffer = ThreadLocal.withInitial(() -> null);
public Lz4Codec() {}
protected static byte[] getBuffer(int size) {
byte[] result = threadBuffer.get();
if (result == null || result.length < size || result.length > size * 2) {
result = new byte[size];
threadBuffer.set(result);
}
return result;
}
@Override
public Options getDefaultOptions() {
return CompressionCodec.NullOptions.INSTANCE;
}
@Override
public boolean compress(ByteBuffer in, ByteBuffer out,
ByteBuffer overflow,
Options options) throws IOException {
int inBytes = in.remaining();
// Skip with minimum size check similar to ZstdCodec
if (inBytes < 10) return false;
LZ4Compressor compressor = lz4Factory.fastCompressor();
int maxOutputLength = compressor.maxCompressedLength(inBytes);
byte[] compressed = getBuffer(maxOutputLength);
int outBytes = compressor.compress(in.array(), in.arrayOffset() + in.position(), inBytes,
compressed, 0, maxOutputLength);
if (outBytes < inBytes) {
int remaining = out.remaining();
if (remaining >= outBytes) {
System.arraycopy(compressed, 0, out.array(), out.arrayOffset() +
out.position(), outBytes);
out.position(out.position() + outBytes);
} else {
System.arraycopy(compressed, 0, out.array(), out.arrayOffset() +
out.position(), remaining);
out.position(out.limit());
System.arraycopy(compressed, remaining, overflow.array(),
overflow.arrayOffset(), outBytes - remaining);
overflow.position(outBytes - remaining);
}
return true;
} else {
return false;
}
}
@Override
public void decompress(ByteBuffer in, ByteBuffer out) throws IOException {
if (in.isDirect() && out.isDirect()) {
directDecompress(in, out);
return;
}
int srcOffset = in.arrayOffset() + in.position();
int srcSize = in.remaining();
int dstOffset = out.arrayOffset() + out.position();
int dstSize = out.remaining();
LZ4SafeDecompressor decompressor = lz4Factory.safeDecompressor();
int decompressedBytes = decompressor.decompress(in.array(), srcOffset, srcSize, out.array(),
dstOffset, dstSize);
in.position(in.limit());
out.position(dstOffset + decompressedBytes);
out.flip();
}
@Override
public boolean isAvailable() {
return true;
}
@Override
public void directDecompress(ByteBuffer in, ByteBuffer out) throws IOException {
LZ4SafeDecompressor decompressor = lz4Factory.safeDecompressor();
decompressor.decompress(in, out);
out.flip();
}
@Override
public void reset() {
}
@Override
public void destroy() {
}
@Override
public CompressionKind getKind() {
return CompressionKind.LZ4;
}
@Override
public void close() {
OrcCodecPool.returnCodec(CompressionKind.LZ4, this);
}
}