| /* |
| * |
| * 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.server.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; |
| } |
| } |