1 /** 2 * Copyright 2013 Florian Schmaus 3 * 4 * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package org.jivesoftware.smack.compression; 17 18 import java.io.InputStream; 19 import java.io.OutputStream; 20 import java.lang.reflect.Constructor; 21 import java.lang.reflect.InvocationTargetException; 22 import java.lang.reflect.Method; 23 24 /** 25 * This class provides XMPP "zlib" compression with the help of JZLib. Note that jzlib-1.0.7 must be used (i.e. in the 26 * classpath), newer versions won't work! 27 * 28 * @author Florian Schmaus 29 * @see <a href="http://www.jcraft.com/jzlib/">JZLib</a> 30 * 31 */ 32 public class JzlibInputOutputStream extends XMPPInputOutputStream { 33 34 private static Class<?> zoClass = null; 35 private static Class<?> ziClass = null; 36 37 static { 38 try { 39 zoClass = Class.forName("com.jcraft.jzlib.ZOutputStream"); 40 ziClass = Class.forName("com.jcraft.jzlib.ZInputStream"); 41 } catch (ClassNotFoundException e) { 42 } 43 } 44 45 public JzlibInputOutputStream() { 46 compressionMethod = "zlib"; 47 } 48 49 @Override 50 public boolean isSupported() { 51 return (zoClass != null && ziClass != null); 52 } 53 54 @Override 55 public InputStream getInputStream(InputStream inputStream) throws SecurityException, NoSuchMethodException, 56 IllegalArgumentException, IllegalAccessException, InvocationTargetException, InstantiationException { 57 Constructor<?> constructor = ziClass.getConstructor(InputStream.class); 58 Object in = constructor.newInstance(inputStream); 59 60 Method method = ziClass.getMethod("setFlushMode", Integer.TYPE); 61 method.invoke(in, 2); 62 return (InputStream) in; 63 } 64 65 @Override 66 public OutputStream getOutputStream(OutputStream outputStream) throws SecurityException, NoSuchMethodException, 67 IllegalArgumentException, InstantiationException, IllegalAccessException, InvocationTargetException { 68 Constructor<?> constructor = zoClass.getConstructor(OutputStream.class, Integer.TYPE); 69 Object out = constructor.newInstance(outputStream, 9); 70 71 Method method = zoClass.getMethod("setFlushMode", Integer.TYPE); 72 method.invoke(out, 2); 73 return (OutputStream) out; 74 } 75 } 76
