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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.common.compress.lzf;
import com.ning.compress.lzf.ChunkDecoder;
import com.ning.compress.lzf.LZFChunk;
import com.ning.compress.lzf.util.ChunkDecoderFactory;
import org.apache.lucene.store.IndexInput;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.compress.CompressedIndexInput;
import org.elasticsearch.common.compress.Compressor;
import org.elasticsearch.common.compress.deflate.DeflateCompressor;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.logging.Loggers;
import org.jboss.netty.buffer.ChannelBuffer;
import java.io.IOException;
/**
* @deprecated Use {@link DeflateCompressor} instead
*/
@Deprecated
public class LZFCompressor implements Compressor {
static final byte[] LUCENE_HEADER = {'L', 'Z', 'F', 0};
private ChunkDecoder decoder;
public LZFCompressor() {
this.decoder = ChunkDecoderFactory.safeInstance();
Loggers.getLogger(LZFCompressor.class).debug("using decoder[{}] ", this.decoder.getClass().getSimpleName());
}
@Override
public boolean isCompressed(BytesReference bytes) {
return bytes.length() >= 3 &&
bytes.get(0) == LZFChunk.BYTE_Z &&
bytes.get(1) == LZFChunk.BYTE_V &&
(bytes.get(2) == LZFChunk.BLOCK_TYPE_COMPRESSED || bytes.get(2) == LZFChunk.BLOCK_TYPE_NON_COMPRESSED);
}
@Override
public boolean isCompressed(ChannelBuffer buffer) {
int offset = buffer.readerIndex();
return buffer.readableBytes() >= 3 &&
buffer.getByte(offset) == LZFChunk.BYTE_Z &&
buffer.getByte(offset + 1) == LZFChunk.BYTE_V &&
(buffer.getByte(offset + 2) == LZFChunk.BLOCK_TYPE_COMPRESSED || buffer.getByte(offset + 2) == LZFChunk.BLOCK_TYPE_NON_COMPRESSED);
}
@Override
public boolean isCompressed(IndexInput in) throws IOException {
long currentPointer = in.getFilePointer();
// since we have some metdata before the first compressed header, we check on our specific header
if (in.length() - currentPointer < (LUCENE_HEADER.length)) {
return false;
}
for (int i = 0; i < LUCENE_HEADER.length; i++) {
if (in.readByte() != LUCENE_HEADER[i]) {
in.seek(currentPointer);
return false;
}
}
in.seek(currentPointer);
return true;
}
@Override
public StreamInput streamInput(StreamInput in) throws IOException {
return new LZFCompressedStreamInput(in, decoder);
}
@Override
public StreamOutput streamOutput(StreamOutput out) throws IOException {
throw new UnsupportedOperationException("LZF is only here for back compat, no write support");
}
@Override
public CompressedIndexInput indexInput(IndexInput in) throws IOException {
return new LZFCompressedIndexInput(in, decoder);
}
}