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/* Copyright 2017 Google Inc. All Rights Reserved.
Distributed under MIT license.
See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
*/
package org.brotli.wrapper.dec;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.ReadableByteChannel;
/**
* ReadableByteChannel that wraps native brotli decoder.
*/
public class BrotliDecoderChannel extends Decoder implements ReadableByteChannel {
/** The default internal buffer size used by the decoder. */
private static final int DEFAULT_BUFFER_SIZE = 16384;
private final Object mutex = new Object();
/**
* Creates a BrotliDecoderChannel.
*
* @param source underlying source
* @param bufferSize intermediate buffer size
* @param customDictionary initial LZ77 dictionary
*/
public BrotliDecoderChannel(ReadableByteChannel source, int bufferSize) throws IOException {
super(source, bufferSize);
}
public BrotliDecoderChannel(ReadableByteChannel source) throws IOException {
this(source, DEFAULT_BUFFER_SIZE);
}
@Override
public boolean isOpen() {
synchronized (mutex) {
return !closed;
}
}
@Override
public void close() throws IOException {
synchronized (mutex) {
super.close();
}
}
@Override
public int read(ByteBuffer dst) throws IOException {
synchronized (mutex) {
if (closed) {
throw new ClosedChannelException();
}
int result = 0;
while (dst.hasRemaining()) {
int outputSize = decode();
if (outputSize == -1) {
return result == 0 ? -1 : result;
}
result += consume(dst);
}
return result;
}
}
}
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