/* 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.enc;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.nio.channels.Channels;
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/**
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* Output stream that wraps native brotli encoder.
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*/
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public class BrotliOutputStream extends OutputStream {
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/** The default internal buffer size used by the encoder. */
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private static final int DEFAULT_BUFFER_SIZE = 16384;
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private final Encoder encoder;
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/**
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* Creates a BrotliOutputStream.
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*
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* @param destination underlying destination
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* @param params encoding settings
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* @param bufferSize intermediate buffer size
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*/
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public BrotliOutputStream(OutputStream destination, Encoder.Parameters params, int bufferSize)
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throws IOException {
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this.encoder = new Encoder(Channels.newChannel(destination), params, bufferSize);
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}
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public BrotliOutputStream(OutputStream destination, Encoder.Parameters params)
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throws IOException {
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this(destination, params, DEFAULT_BUFFER_SIZE);
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}
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public BrotliOutputStream(OutputStream destination) throws IOException {
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this(destination, new Encoder.Parameters());
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}
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@Override
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public void close() throws IOException {
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encoder.close();
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}
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@Override
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public void flush() throws IOException {
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if (encoder.closed) {
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throw new IOException("write after close");
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}
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encoder.flush();
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}
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@Override
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public void write(int b) throws IOException {
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if (encoder.closed) {
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throw new IOException("write after close");
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}
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while (!encoder.encode(EncoderJNI.Operation.PROCESS)) {
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// Busy-wait loop.
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}
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encoder.inputBuffer.put((byte) b);
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}
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@Override
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public void write(byte[] b) throws IOException {
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this.write(b, 0, b.length);
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}
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@Override
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public void write(byte[] b, int off, int len) throws IOException {
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if (encoder.closed) {
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throw new IOException("write after close");
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}
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while (len > 0) {
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if (!encoder.encode(EncoderJNI.Operation.PROCESS)) {
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continue;
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}
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int limit = Math.min(len, encoder.inputBuffer.remaining());
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encoder.inputBuffer.put(b, off, limit);
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off += limit;
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len -= limit;
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}
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}
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}
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