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/**
* Copyright 2013 Florian Schmaus
*
* All rights reserved. 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.jivesoftware.smack.compression;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
* This class provides XMPP "zlib" compression with the help of JZLib. Note that jzlib-1.0.7 must be used (i.e. in the
* classpath), newer versions won't work!
*
* @author Florian Schmaus
* @see <a href="http://www.jcraft.com/jzlib/">JZLib</a>
*
*/
public class JzlibInputOutputStream extends XMPPInputOutputStream {
private static Class<?> zoClass = null;
private static Class<?> ziClass = null;
static {
try {
zoClass = Class.forName("com.jcraft.jzlib.ZOutputStream");
ziClass = Class.forName("com.jcraft.jzlib.ZInputStream");
} catch (ClassNotFoundException e) {
}
}
public JzlibInputOutputStream() {
compressionMethod = "zlib";
}
@Override
public boolean isSupported() {
return (zoClass != null && ziClass != null);
}
@Override
public InputStream getInputStream(InputStream inputStream) throws SecurityException, NoSuchMethodException,
IllegalArgumentException, IllegalAccessException, InvocationTargetException, InstantiationException {
Constructor<?> constructor = ziClass.getConstructor(InputStream.class);
Object in = constructor.newInstance(inputStream);
Method method = ziClass.getMethod("setFlushMode", Integer.TYPE);
method.invoke(in, 2);
return (InputStream) in;
}
@Override
public OutputStream getOutputStream(OutputStream outputStream) throws SecurityException, NoSuchMethodException,
IllegalArgumentException, InstantiationException, IllegalAccessException, InvocationTargetException {
Constructor<?> constructor = zoClass.getConstructor(OutputStream.class, Integer.TYPE);
Object out = constructor.newInstance(outputStream, 9);
Method method = zoClass.getMethod("setFlushMode", Integer.TYPE);
method.invoke(out, 2);
return (OutputStream) out;
}
}
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