Maurice Chu | 667f9a8 | 2013-10-16 13:12:22 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 The Android Open Source Project |
| 3 | * |
| 4 | * 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 | |
| 17 | package android.support.multidex; |
| 18 | |
| 19 | import android.content.Context; |
| 20 | import android.content.pm.ApplicationInfo; |
| 21 | import android.util.Log; |
| 22 | |
| 23 | import java.io.Closeable; |
| 24 | import java.io.File; |
| 25 | import java.io.FileNotFoundException; |
| 26 | import java.io.FileOutputStream; |
| 27 | import java.io.FilenameFilter; |
| 28 | import java.io.IOException; |
| 29 | import java.io.InputStream; |
| 30 | import java.util.ArrayList; |
| 31 | import java.util.List; |
| 32 | import java.util.zip.ZipEntry; |
| 33 | import java.util.zip.ZipFile; |
| 34 | import java.util.zip.ZipOutputStream; |
| 35 | |
| 36 | /** |
| 37 | * Exposes application secondary dex files as files in the application data |
| 38 | * directory. |
| 39 | */ |
| 40 | final class MultiDexExtractor { |
| 41 | |
| 42 | private static final String TAG = MultiDex.TAG; |
| 43 | |
| 44 | /** |
| 45 | * We look for additional dex files named {@code classes2.dex}, |
| 46 | * {@code classes3.dex}, etc. |
| 47 | */ |
| 48 | private static final String DEX_PREFIX = "classes"; |
| 49 | private static final String DEX_SUFFIX = ".dex"; |
| 50 | |
| 51 | private static final String EXTRACTED_NAME_EXT = ".classes"; |
| 52 | private static final String EXTRACTED_SUFFIX = ".zip"; |
| 53 | |
| 54 | private static final int BUFFER_SIZE = 0x4000; |
| 55 | |
| 56 | /** |
| 57 | * Extracts application secondary dexes into files in the application data |
| 58 | * directory. |
| 59 | * |
| 60 | * @param dexDir |
| 61 | * |
| 62 | * @return a list of files that were created. The list may be empty if there |
| 63 | * are no secondary dex files. |
| 64 | * @throws IOException if encounters a problem while reading or writing |
| 65 | * secondary dex files |
| 66 | */ |
| 67 | static List<File> load(Context context, ApplicationInfo applicationInfo, File dexDir) |
| 68 | throws IOException { |
| 69 | |
| 70 | String extractedFilePrefix = new File(applicationInfo.sourceDir).getName() |
| 71 | + EXTRACTED_NAME_EXT; |
| 72 | |
| 73 | prepareDexDir(dexDir, extractedFilePrefix); |
| 74 | |
| 75 | final List<File> files = new ArrayList<File>(); |
| 76 | ZipFile apk = new ZipFile(applicationInfo.sourceDir); |
| 77 | try { |
| 78 | |
| 79 | int secondaryNumber = 2; |
| 80 | |
| 81 | ZipEntry dexFile = apk.getEntry(DEX_PREFIX + secondaryNumber + DEX_SUFFIX); |
| 82 | while (dexFile != null) { |
| 83 | String fileName = extractedFilePrefix + secondaryNumber + EXTRACTED_SUFFIX; |
| 84 | File extractedFile = new File(dexDir, fileName); |
| 85 | files.add(extractedFile); |
| 86 | |
| 87 | if (!extractedFile.isFile()) { |
| 88 | extract(context, apk, dexFile, extractedFile, extractedFilePrefix); |
| 89 | } |
| 90 | secondaryNumber++; |
| 91 | dexFile = apk.getEntry(DEX_PREFIX + secondaryNumber + DEX_SUFFIX); |
| 92 | } |
| 93 | } finally { |
| 94 | try { |
| 95 | apk.close(); |
| 96 | } catch (IOException e) { |
| 97 | Log.w(TAG, "Failed to close resource", e); |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | return files; |
| 102 | } |
| 103 | |
| 104 | private static void prepareDexDir(File dexDir, final String extractedFilePrefix) |
| 105 | throws IOException { |
| 106 | dexDir.mkdir(); |
| 107 | if (!dexDir.isDirectory()) { |
| 108 | throw new IOException("Failed to create dex directory " + dexDir.getPath()); |
| 109 | } |
| 110 | |
| 111 | // Clean possible old files |
| 112 | FilenameFilter filter = new FilenameFilter() { |
| 113 | @Override |
| 114 | public boolean accept(File dir, String name) { |
| 115 | return !name.startsWith(extractedFilePrefix); |
| 116 | } |
| 117 | }; |
| 118 | File[] files = dexDir.listFiles(filter); |
| 119 | if (files == null) { |
| 120 | Log.w(TAG, "Failed to list secondary dex dir content (" + dexDir.getPath() + ")."); |
| 121 | return; |
| 122 | } |
| 123 | for (File oldFile : files) { |
| 124 | if (!oldFile.delete()) { |
| 125 | Log.w(TAG, "Failed to delete old file " + oldFile.getPath()); |
| 126 | } |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | private static void extract( |
| 131 | Context context, ZipFile apk, ZipEntry dexFile, File extractTo, |
| 132 | String extractedFilePrefix) throws IOException, FileNotFoundException { |
| 133 | |
| 134 | InputStream in = apk.getInputStream(dexFile); |
| 135 | ZipOutputStream out = null; |
| 136 | File tmp = File.createTempFile(extractedFilePrefix, EXTRACTED_SUFFIX, |
| 137 | extractTo.getParentFile()); |
| 138 | Log.i(TAG, "Extracting " + tmp.getPath()); |
| 139 | try { |
| 140 | out = new ZipOutputStream(new FileOutputStream(tmp)); |
| 141 | try { |
| 142 | ZipEntry classesDex = new ZipEntry("classes.dex"); |
Yohann Roussel | edf0717 | 2013-11-12 18:11:02 +0100 | [diff] [blame^] | 143 | // keep zip entry time since it is the criteria used by Dalvik |
| 144 | classesDex.setTime(dexFile.getTime()); |
Maurice Chu | 667f9a8 | 2013-10-16 13:12:22 -0700 | [diff] [blame] | 145 | out.putNextEntry(classesDex); |
| 146 | |
| 147 | byte[] buffer = new byte[BUFFER_SIZE]; |
| 148 | int length = in.read(buffer); |
| 149 | while (length > 0) { |
| 150 | out.write(buffer, 0, length); |
| 151 | length = in.read(buffer); |
| 152 | } |
| 153 | } finally { |
| 154 | closeQuietly(out); |
| 155 | } |
| 156 | Log.i(TAG, "Renaming to " + extractTo.getPath()); |
| 157 | if (!tmp.renameTo(extractTo)) { |
| 158 | throw new IOException("Failed to rename \"" + tmp.getAbsolutePath() + "\" to \"" + |
| 159 | extractTo.getAbsolutePath() + "\""); |
| 160 | } |
| 161 | } finally { |
| 162 | closeQuietly(in); |
| 163 | tmp.delete(); // return status ignored |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | /** |
| 168 | * Closes the given {@code Closeable}. Suppresses any IO exceptions. |
| 169 | */ |
| 170 | private static void closeQuietly(Closeable closeable) { |
| 171 | try { |
| 172 | closeable.close(); |
| 173 | } catch (IOException e) { |
| 174 | Log.w(TAG, "Failed to close resource", e); |
| 175 | } |
| 176 | } |
| 177 | } |