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