76 lines
2.7 KiB
Java
76 lines
2.7 KiB
Java
/**
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* Copyright 2013 Florian Schmaus
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*
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* All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack.compression;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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/**
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* This class provides XMPP "zlib" compression with the help of JZLib. Note that jzlib-1.0.7 must be used (i.e. in the
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* classpath), newer versions won't work!
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*
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* @author Florian Schmaus
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* @see <a href="http://www.jcraft.com/jzlib/">JZLib</a>
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*
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*/
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public class JzlibInputOutputStream extends XMPPInputOutputStream {
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private static Class<?> zoClass = null;
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private static Class<?> ziClass = null;
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static {
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try {
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zoClass = Class.forName("com.jcraft.jzlib.ZOutputStream");
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ziClass = Class.forName("com.jcraft.jzlib.ZInputStream");
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} catch (ClassNotFoundException e) {
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}
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}
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public JzlibInputOutputStream() {
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compressionMethod = "zlib";
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}
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@Override
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public boolean isSupported() {
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return (zoClass != null && ziClass != null);
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}
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@Override
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public InputStream getInputStream(InputStream inputStream) throws SecurityException, NoSuchMethodException,
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IllegalArgumentException, IllegalAccessException, InvocationTargetException, InstantiationException {
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Constructor<?> constructor = ziClass.getConstructor(InputStream.class);
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Object in = constructor.newInstance(inputStream);
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Method method = ziClass.getMethod("setFlushMode", Integer.TYPE);
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method.invoke(in, 2);
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return (InputStream) in;
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}
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@Override
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public OutputStream getOutputStream(OutputStream outputStream) throws SecurityException, NoSuchMethodException,
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IllegalArgumentException, InstantiationException, IllegalAccessException, InvocationTargetException {
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Constructor<?> constructor = zoClass.getConstructor(OutputStream.class, Integer.TYPE);
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Object out = constructor.newInstance(outputStream, 9);
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Method method = zoClass.getMethod("setFlushMode", Integer.TYPE);
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method.invoke(out, 2);
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return (OutputStream) out;
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}
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}
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