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/*
*
* 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.qpid.util;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class GZIPUtils
{
private static final Logger LOGGER = LoggerFactory.getLogger(GZIPUtils.class);
public static final String GZIP_CONTENT_ENCODING = "gzip";
/**
* Return a new byte array with the compressed contents of the input buffer
*
* @param input byte buffer to compress
* @return a byte array containing the compressed data, or null if the input was null or there was an unexpected
* IOException while compressing
*/
public static byte[] compressBufferToArray(ByteBuffer input)
{
if(input != null)
{
try (ByteArrayOutputStream compressedBuffer = new ByteArrayOutputStream())
{
try (GZIPOutputStream gzipOutputStream = new GZIPOutputStream(compressedBuffer))
{
if (input.hasArray())
{
gzipOutputStream.write(input.array(),
input.arrayOffset() + input.position(),
input.remaining());
}
else
{
byte[] data = new byte[input.remaining()];
input.duplicate().get(data);
gzipOutputStream.write(data);
}
}
return compressedBuffer.toByteArray();
}
catch (IOException e)
{
LOGGER.warn("Unexpected IOException when attempting to compress with gzip", e);
}
}
return null;
}
public static byte[] uncompressBufferToArray(ByteBuffer contentBuffer)
{
if(contentBuffer != null)
{
try (ByteBufferInputStream input = new ByteBufferInputStream(contentBuffer))
{
return uncompressStreamToArray(input);
}
}
else
{
return null;
}
}
public static byte[] uncompressStreamToArray(InputStream stream)
{
if(stream != null)
{
try (GZIPInputStream gzipInputStream = new GZIPInputStream(stream))
{
ByteArrayOutputStream inflatedContent = new ByteArrayOutputStream();
int read;
byte[] buf = new byte[4096];
while ((read = gzipInputStream.read(buf)) != -1)
{
inflatedContent.write(buf, 0, read);
}
return inflatedContent.toByteArray();
}
catch (IOException e)
{
LOGGER.warn("Unexpected IOException when attempting to uncompress with gzip", e);
}
}
return null;
}
}
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