1b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato/* 2b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * ProGuard -- shrinking, optimization, obfuscation, and preverification 3b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * of Java bytecode. 4b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 5b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * Copyright (c) 2002-2013 Eric Lafortune (eric@graphics.cornell.edu) 6b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 7b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * This program is free software; you can redistribute it and/or modify it 8b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * under the terms of the GNU General Public License as published by the Free 9b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Software Foundation; either version 2 of the License, or (at your option) 10b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * any later version. 11b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 12b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * This program is distributed in the hope that it will be useful, but WITHOUT 13b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * more details. 16b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 17b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * You should have received a copy of the GNU General Public License along 18b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * with this program; if not, write to the Free Software Foundation, Inc., 19b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 21b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratopackage proguard.io; 22b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 23b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.classfile.*; 24b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.classfile.util.ClassUtil; 25b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 26b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport java.io.IOException; 27b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport java.util.Map; 28b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 29b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato/** 30b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * This DataEntryReader delegates to another DataEntryReader, renaming the 31b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * data entries based on the renamed classes in the given ClassPool. 32b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 33b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @author Eric Lafortune 34b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 35b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratopublic class DataEntryObfuscator implements DataEntryReader 36b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato{ 37b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato private final ClassPool classPool; 38b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato private final Map packagePrefixMap; 39b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato private final DataEntryReader dataEntryReader; 40b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 41b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 42b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 43b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Creates a new DataEntryObfuscator. 44b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @param classPool the class pool that maps from old names to new 45b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * names. 46b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @param packagePrefixMap the map from old package prefixes to new package 47b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * prefixes. 48b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @param dataEntryReader the DataEntryReader to which calls will be 49b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * delegated. 50b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 51b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public DataEntryObfuscator(ClassPool classPool, 52b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato Map packagePrefixMap, 53b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato DataEntryReader dataEntryReader) 54b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 55b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this.classPool = classPool; 56b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this.packagePrefixMap = packagePrefixMap; 57b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this.dataEntryReader = dataEntryReader; 58b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 59b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 60b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 61b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Implementations for DataEntryReader. 62b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 63b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public void read(DataEntry dataEntry) throws IOException 64b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 65b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Delegate to the actual data entry reader. 66b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato dataEntryReader.read(renamedDataEntry(dataEntry)); 67b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 68b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 69b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 70b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 71b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Create a renamed data entry, if possible. 72b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 73b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato private DataEntry renamedDataEntry(DataEntry dataEntry) 74b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 75b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato String dataEntryName = dataEntry.getName(); 76b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 77b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Try to find a corresponding class name by removing increasingly 78b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang // long suffixes. 79b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato for (int suffixIndex = dataEntryName.length() - 1; 80b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato suffixIndex > 0; 81b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato suffixIndex--) 82b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 83b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato char c = dataEntryName.charAt(suffixIndex); 84b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato if (!Character.isLetterOrDigit(c)) 85b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 86b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Chop off the suffix. 87b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato String className = dataEntryName.substring(0, suffixIndex); 88b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 89b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Did we get to the package separator? 90b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato if (c == ClassConstants.INTERNAL_PACKAGE_SEPARATOR) 91b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 92b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato break; 93b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 94b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 95b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Is there a class corresponding to the data entry? 96b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato Clazz clazz = classPool.getClass(className); 97b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato if (clazz != null) 98b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 99b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Did the class get a new name? 100b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato String newClassName = clazz.getName(); 101b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato if (!className.equals(newClassName)) 102b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 103b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Return a renamed data entry. 104b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato String newDataEntryName = 105b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato newClassName + dataEntryName.substring(suffixIndex); 106b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 107b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato return new RenamedDataEntry(dataEntry, newDataEntryName); 108b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 109b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang else 110b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang { 111b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang // Otherwise stop looking. 112b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang return dataEntry; 113b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang } 114b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 115b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 116b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 117b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 118b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang // Try to find a corresponding package name by increasingly removing 119b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang // more subpackages. 120b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang String packagePrefix = dataEntryName; 121b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang do 122b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 123b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang // Chop off the class name or the last subpackage name. 124b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang packagePrefix = ClassUtil.internalPackagePrefix(packagePrefix); 125b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 126b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang // Is there a package corresponding to the package prefix? 127b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang String newPackagePrefix = (String)packagePrefixMap.get(packagePrefix); 128b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang if (newPackagePrefix != null) 129b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang { 130b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang // Did the package get a new name? 131b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang if (!packagePrefix.equals(newPackagePrefix)) 132b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang { 133b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang // Return a renamed data entry. 134b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang String newDataEntryName = 135b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang newPackagePrefix + dataEntryName.substring(packagePrefix.length()); 136b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang 137b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang return new RenamedDataEntry(dataEntry, newDataEntryName); 138b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang } 139b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang else 140b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang { 141b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang // Otherwise stop looking. 142b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang return dataEntry; 143b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang } 144b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang } 145b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 146b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang while (packagePrefix.length() > 0); 147b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 148b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato return dataEntry; 149b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 150b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato} 151