org.igniterealtime.jbosh.GZIPCodec Maven / Gradle / Ivy
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Library to connect to Cisco Enterprise Chat and Email (ECE) chat interface which is a modified version of XMPP over BOSH standard.
/*
* Copyright 2009 Mike Cumings
*
* Licensed 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.igniterealtime.jbosh;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
/**
* Codec methods for compressing and uncompressing using GZIP.
*/
final class GZIPCodec {
/**
* Size of the internal buffer when decoding.
*/
private static final int BUFFER_SIZE = 512;
///////////////////////////////////////////////////////////////////////////
// Constructors:
/**
* Prevent construction.
*/
private GZIPCodec() {
// Empty
}
/**
* Returns the name of the codec.
*
* @return string name of the codec (i.e., "gzip")
*/
public static String getID() {
return "gzip";
}
/**
* Compress/encode the data provided using the GZIP format.
*
* @param data data to compress
* @return compressed data
* @throws IOException on compression failure
*/
public static byte[] encode(final byte[] data) throws IOException {
ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
GZIPOutputStream gzOut = null;
try {
gzOut = new GZIPOutputStream(byteOut);
gzOut.write(data);
gzOut.close();
byteOut.close();
return byteOut.toByteArray();
} finally {
gzOut.close();
byteOut.close();
}
}
/**
* Uncompress/decode the data provided using the GZIP format.
*
* @param data data to uncompress
* @return uncompressed data
* @throws IOException on decompression failure
*/
public static byte[] decode(final byte[] compressed) throws IOException {
ByteArrayInputStream byteIn = new ByteArrayInputStream(compressed);
ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
GZIPInputStream gzIn = null;
try {
gzIn = new GZIPInputStream(byteIn);
int read;
byte[] buffer = new byte[BUFFER_SIZE];
do {
read = gzIn.read(buffer);
if (read > 0) {
byteOut.write(buffer, 0, read);
}
} while (read >= 0);
return byteOut.toByteArray();
} finally {
gzIn.close();
byteOut.close();
}
}
}