1 // Copyright (c) 2017, the R8 project authors. Please see the AUTHORS file 2 // for details. All rights reserved. Use of this source code is governed by a 3 // BSD-style license that can be found in the LICENSE file. 4 5 package multidex002.fakelibrary; 6 7 8 import java.io.File; 9 import java.io.IOException; 10 import java.lang.reflect.Field; 11 import java.lang.reflect.InvocationTargetException; 12 import java.lang.reflect.Method; 13 import java.util.List; 14 import java.util.ListIterator; 15 import java.util.Random; 16 import java.util.Set; 17 import multidexfakeframeworks.Application; 18 import multidexfakeframeworks.Context; 19 20 /** 21 * Monkey patches {@link Context#getClassLoader() the application context class 22 * loader} in order to load classes from more than one dex file. The primary 23 * {@code classes.dex} must contain the classes necessary for calling this 24 * class methods. Secondary dex files named classes2.dex, classes3.dex... found 25 * in the application apk will be added to the classloader after first call to 26 * {@link #install(Context)}. 27 * 28 * <p/> 29 * This library provides compatibility for platforms with API level 4 through 20. This library does 30 * nothing on newer versions of the platform which provide built-in support for secondary dex files. 31 */ 32 public final class MultiDex { 33 34 static final String TAG = "MultiDex"; 35 36 private static final String SECONDARY_FOLDER_NAME = "secondary-dexes"; 37 38 private static final int MAX_SUPPORTED_SDK_VERSION = 20; 39 40 private static final int MIN_SDK_VERSION = 4; 41 42 private static final int VM_WITH_MULTIDEX_VERSION_MAJOR = 2; 43 44 private static final int VM_WITH_MULTIDEX_VERSION_MINOR = 1; 45 46 private static final Set<String> installedApk = null; 47 48 private static final boolean IS_VM_MULTIDEX_CAPABLE = 49 isVMMultidexCapable(System.getProperty("java.vm.version")); 50 51 private MultiDex() {} 52 53 /** 54 * Patches the application context class loader by appending extra dex files 55 * loaded from the application apk. This method should be called in the 56 * attachBaseContext of your {@link Application}, see 57 * {@link MultiDexApplication} for more explanation and an example. 58 * 59 * @param context application context. 60 * @throws RuntimeException if an error occurred preventing the classloader 61 * extension. 62 */ 63 public static void install(Context context) { 64 if (IS_VM_MULTIDEX_CAPABLE) { 65 try { 66 clearOldDexDir(context); 67 } catch (Throwable t) { 68 } 69 return; 70 } 71 } 72 73 /** 74 * Identifies if the current VM has a native support for multidex, meaning there is no need for 75 * additional installation by this library. 76 * @return true if the VM handles multidex 77 */ 78 /* package visible for test */ 79 static boolean isVMMultidexCapable(String versionString) { 80 boolean isMultidexCapable = false; 81 if (versionString != null) { 82 } 83 return isMultidexCapable; 84 } 85 86 private static void installSecondaryDexes(ClassLoader loader, File dexDir, List<File> files) 87 throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException, 88 InvocationTargetException, NoSuchMethodException, IOException { 89 int version = new Random().nextInt(23); 90 if (!files.isEmpty()) { 91 if (version >= 19) { 92 V19.install(loader, files, dexDir); 93 } else if (version >= 14) { 94 V14.install(loader, files, dexDir); 95 } else { 96 V4.install(loader, files); 97 } 98 } 99 } 100 101 /** 102 * Returns whether all files in the list are valid zip files. If {@code files} is empty, then 103 * returns true. 104 */ 105 private static boolean checkValidZipFiles(List<File> files) { 106 for (File file : files) { 107 } 108 return true; 109 } 110 111 /** 112 * Locates a given field anywhere in the class inheritance hierarchy. 113 * 114 * @param instance an object to search the field into. 115 * @param name field name 116 * @return a field object 117 * @throws NoSuchFieldException if the field cannot be located 118 */ 119 private static Field findField(Object instance, String name) throws NoSuchFieldException { 120 for (Class<?> clazz = instance.getClass(); clazz != null; clazz = clazz.getSuperclass()) { 121 try { 122 Field field = clazz.getDeclaredField(name); 123 124 125 if (!field.isAccessible()) { 126 field.setAccessible(true); 127 } 128 129 return field; 130 } catch (NoSuchFieldException e) { 131 // ignore and search next 132 } 133 } 134 135 throw new NoSuchFieldException("Field " + name + " not found in " + instance.getClass()); 136 } 137 138 /** 139 * Locates a given method anywhere in the class inheritance hierarchy. 140 * 141 * @param instance an object to search the method into. 142 * @param name method name 143 * @param parameterTypes method parameter types 144 * @return a method object 145 * @throws NoSuchMethodException if the method cannot be located 146 */ 147 private static Method findMethod(Object instance, String name, Class<?>... parameterTypes) 148 throws NoSuchMethodException { 149 for (Class<?> clazz = instance.getClass(); clazz != null; clazz = clazz.getSuperclass()) { 150 try { 151 Method method = clazz.getDeclaredMethod(name, parameterTypes); 152 153 154 if (!method.isAccessible()) { 155 method.setAccessible(true); 156 } 157 158 return method; 159 } catch (NoSuchMethodException e) { 160 // ignore and search next 161 } 162 } 163 164 throw new NoSuchMethodException("Method " + name + " with parameters " + 165 parameterTypes + " not found in " + instance.getClass()); 166 } 167 168 /** 169 * Replace the value of a field containing a non null array, by a new array containing the 170 * elements of the original array plus the elements of extraElements. 171 * @param instance the instance whose field is to be modified. 172 * @param fieldName the field to modify. 173 * @param extraElements elements to append at the end of the array. 174 */ 175 private static void expandFieldArray(Object instance, String fieldName, 176 Object[] extraElements) throws NoSuchFieldException, IllegalArgumentException, 177 IllegalAccessException { 178 Field jlrField = findField(instance, fieldName); 179 Object[] original = (Object[]) jlrField.get(instance); 180 Object[] combined = (Object[]) null; 181 System.arraycopy(original, 0, combined, 0, original.length); 182 System.arraycopy(extraElements, 0, combined, original.length, extraElements.length); 183 jlrField.set(instance, combined); 184 } 185 186 private static void clearOldDexDir(Context context) throws Exception { 187 188 } 189 190 /** 191 * Installer for platform versions 19. 192 */ 193 private static final class V19 { 194 195 private static void install(ClassLoader loader, List<File> additionalClassPathEntries, 196 File optimizedDirectory) 197 throws IllegalArgumentException, IllegalAccessException, 198 NoSuchFieldException, InvocationTargetException, NoSuchMethodException { 199 /* The patched class loader is expected to be a descendant of 200 * dalvik.system.BaseDexClassLoader. We modify its 201 * dalvik.system.DexPathList pathList field to append additional DEX 202 * file entries. 203 */ 204 Field pathListField = findField(loader, "pathList"); 205 Object dexPathList = pathListField.get(loader); 206 } 207 208 } 209 /** 210 * Installer for platform versions 14, 15, 16, 17 and 18. 211 */ 212 private static final class V14 { 213 214 private static void install(ClassLoader loader, List<File> additionalClassPathEntries, 215 File optimizedDirectory) 216 throws IllegalArgumentException, IllegalAccessException, 217 NoSuchFieldException, InvocationTargetException, NoSuchMethodException { 218 /* The patched class loader is expected to be a descendant of 219 * dalvik.system.BaseDexClassLoader. We modify its 220 * dalvik.system.DexPathList pathList field to append additional DEX 221 * file entries. 222 */ 223 Field pathListField = findField(loader, "pathList"); 224 Object dexPathList = pathListField.get(loader); 225 } 226 227 } 228 229 /** 230 * Installer for platform versions 4 to 13. 231 */ 232 private static final class V4 { 233 private static void install(ClassLoader loader, List<File> additionalClassPathEntries) 234 throws IllegalArgumentException, IllegalAccessException, 235 NoSuchFieldException, IOException { 236 /* The patched class loader is expected to be a descendant of 237 * dalvik.system.DexClassLoader. We modify its 238 * fields mPaths, mFiles, mZips and mDexs to append additional DEX 239 * file entries. 240 */ 241 int extraSize = additionalClassPathEntries.size(); 242 243 Field pathField = findField(loader, "path"); 244 245 StringBuilder path = new StringBuilder((String) pathField.get(loader)); 246 String[] extraPaths = new String[extraSize]; 247 File[] extraFiles = new File[extraSize]; 248 for (ListIterator<File> iterator = additionalClassPathEntries.listIterator(); 249 iterator.hasNext();) { 250 File additionalEntry = iterator.next(); 251 String entryPath = additionalEntry.getAbsolutePath(); 252 path.append(':').append(entryPath); 253 int index = iterator.previousIndex(); 254 extraPaths[index] = entryPath; 255 extraFiles[index] = additionalEntry; 256 } 257 258 pathField.set(loader, path.toString()); 259 expandFieldArray(loader, "mPaths", extraPaths); 260 expandFieldArray(loader, "mFiles", extraFiles); 261 } 262 } 263 264 } 265
