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package net.jpountz.lz4;
/*
* Licensed 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.
*/
import java.nio.ByteBuffer;
import net.jpountz.util.ByteBufferUtils;
import net.jpountz.util.SafeUtils;
/**
* {@link LZ4FastDecompressor} implemented with JNI bindings to the original C
* implementation of LZ4.
*/
final class LZ4JNIFastDecompressor extends LZ4FastDecompressor {
public static final LZ4JNIFastDecompressor INSTANCE = new LZ4JNIFastDecompressor();
private static LZ4FastDecompressor SAFE_INSTANCE;
@Override
public final int decompress(byte[] src, int srcOff, byte[] dest, int destOff, int destLen) {
SafeUtils.checkRange(src, srcOff);
SafeUtils.checkRange(dest, destOff, destLen);
final int result = LZ4JNI.LZ4_decompress_fast(src, null, srcOff, dest, null, destOff, destLen);
if (result < 0) {
throw new LZ4Exception("Error decoding offset " + (srcOff - result) + " of input buffer");
}
return result;
}
@Override
public int decompress(ByteBuffer src, int srcOff, ByteBuffer dest, int destOff, int destLen) {
ByteBufferUtils.checkNotReadOnly(dest);
ByteBufferUtils.checkRange(src, srcOff);
ByteBufferUtils.checkRange(dest, destOff, destLen);
if ((src.hasArray() || src.isDirect()) && (dest.hasArray() || dest.isDirect())) {
byte[] srcArr = null, destArr = null;
ByteBuffer srcBuf = null, destBuf = null;
if (src.hasArray()) {
srcArr = src.array();
srcOff += src.arrayOffset();
} else {
assert src.isDirect();
srcBuf = src;
}
if (dest.hasArray()) {
destArr = dest.array();
destOff += dest.arrayOffset();
} else {
assert dest.isDirect();
destBuf = dest;
}
final int result = LZ4JNI.LZ4_decompress_fast(srcArr, srcBuf, srcOff, destArr, destBuf, destOff, destLen);
if (result < 0) {
throw new LZ4Exception("Error decoding offset " + (srcOff - result) + " of input buffer");
}
return result;
} else {
LZ4FastDecompressor safeInstance = SAFE_INSTANCE;
if (safeInstance == null) {
safeInstance = SAFE_INSTANCE = LZ4Factory.safeInstance().fastDecompressor();
}
return safeInstance.decompress(src, srcOff, dest, destOff, destLen);
}
}
}
