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Apache Commons Compress software defines an API for working with
compression and archive formats. These include: bzip2, gzip, pack200,
lzma, xz, Snappy, traditional Unix Compress, DEFLATE, DEFLATE64, LZ4,
Brotli, Zstandard and ar, cpio, jar, tar, zip, dump, 7z, arj.
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.apache.commons.compress.compressors.deflate;
import java.io.IOException;
import java.io.OutputStream;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
import org.apache.commons.compress.compressors.CompressorOutputStream;
/**
* Deflate compressor.
* @since 1.9
*/
public class DeflateCompressorOutputStream extends CompressorOutputStream {
private final DeflaterOutputStream out;
private final Deflater deflater;
/**
* Creates a Deflate compressed output stream with the default parameters.
* @param outputStream the stream to wrap
*/
public DeflateCompressorOutputStream(final OutputStream outputStream) {
this(outputStream, new DeflateParameters());
}
/**
* Creates a Deflate compressed output stream with the specified parameters.
* @param outputStream the stream to wrap
* @param parameters the deflate parameters to apply
*/
public DeflateCompressorOutputStream(final OutputStream outputStream,
final DeflateParameters parameters) {
this.deflater = new Deflater(parameters.getCompressionLevel(), !parameters.withZlibHeader());
this.out = new DeflaterOutputStream(outputStream, deflater);
}
@Override
public void close() throws IOException {
try {
out.close();
} finally {
deflater.end();
}
}
/**
* Finishes compression without closing the underlying stream.
* No more data can be written to this stream after finishing.
* @throws IOException on error
*/
public void finish() throws IOException {
out.finish();
}
/**
* Flushes the encoder and calls {@code outputStream.flush()}.
* All buffered pending data will then be decompressible from
* the output stream. Calling this function very often may increase
* the compressed file size a lot.
*/
@Override
public void flush() throws IOException {
out.flush();
}
@Override
public void write(final byte[] buf, final int off, final int len) throws IOException {
out.write(buf, off, len);
}
@Override
public void write(final int b) throws IOException {
out.write(b);
}
}