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