| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package android.content.res; |
| |
| import android.annotation.NonNull; |
| import android.annotation.UnsupportedAppUsage; |
| |
| import com.android.internal.annotations.GuardedBy; |
| import com.android.internal.util.Preconditions; |
| |
| import java.io.FileDescriptor; |
| import java.io.IOException; |
| |
| /** |
| * The loaded, immutable, in-memory representation of an APK. |
| * |
| * The main implementation is native C++ and there is very little API surface exposed here. The APK |
| * is mainly accessed via {@link AssetManager}. |
| * |
| * Since the ApkAssets instance is immutable, it can be reused and shared across AssetManagers, |
| * making the creation of AssetManagers very cheap. |
| * @hide |
| */ |
| public final class ApkAssets { |
| @GuardedBy("this") private final long mNativePtr; |
| @GuardedBy("this") private StringBlock mStringBlock; |
| |
| /** |
| * Creates a new ApkAssets instance from the given path on disk. |
| * |
| * @param path The path to an APK on disk. |
| * @return a new instance of ApkAssets. |
| * @throws IOException if a disk I/O error or parsing error occurred. |
| */ |
| public static @NonNull ApkAssets loadFromPath(@NonNull String path) throws IOException { |
| return new ApkAssets(path, false /*system*/, false /*forceSharedLib*/, false /*overlay*/); |
| } |
| |
| /** |
| * Creates a new ApkAssets instance from the given path on disk. |
| * |
| * @param path The path to an APK on disk. |
| * @param system When true, the APK is loaded as a system APK (framework). |
| * @return a new instance of ApkAssets. |
| * @throws IOException if a disk I/O error or parsing error occurred. |
| */ |
| public static @NonNull ApkAssets loadFromPath(@NonNull String path, boolean system) |
| throws IOException { |
| return new ApkAssets(path, system, false /*forceSharedLib*/, false /*overlay*/); |
| } |
| |
| /** |
| * Creates a new ApkAssets instance from the given path on disk. |
| * |
| * @param path The path to an APK on disk. |
| * @param system When true, the APK is loaded as a system APK (framework). |
| * @param forceSharedLibrary When true, any packages within the APK with package ID 0x7f are |
| * loaded as a shared library. |
| * @return a new instance of ApkAssets. |
| * @throws IOException if a disk I/O error or parsing error occurred. |
| */ |
| public static @NonNull ApkAssets loadFromPath(@NonNull String path, boolean system, |
| boolean forceSharedLibrary) throws IOException { |
| return new ApkAssets(path, system, forceSharedLibrary, false /*overlay*/); |
| } |
| |
| /** |
| * Creates a new ApkAssets instance from the given file descriptor. Not for use by applications. |
| * |
| * Performs a dup of the underlying fd, so you must take care of still closing |
| * the FileDescriptor yourself (and can do that whenever you want). |
| * |
| * @param fd The FileDescriptor of an open, readable APK. |
| * @param friendlyName The friendly name used to identify this ApkAssets when logging. |
| * @param system When true, the APK is loaded as a system APK (framework). |
| * @param forceSharedLibrary When true, any packages within the APK with package ID 0x7f are |
| * loaded as a shared library. |
| * @return a new instance of ApkAssets. |
| * @throws IOException if a disk I/O error or parsing error occurred. |
| */ |
| public static @NonNull ApkAssets loadFromFd(@NonNull FileDescriptor fd, |
| @NonNull String friendlyName, boolean system, boolean forceSharedLibrary) |
| throws IOException { |
| return new ApkAssets(fd, friendlyName, system, forceSharedLibrary); |
| } |
| |
| /** |
| * Creates a new ApkAssets instance from the IDMAP at idmapPath. The overlay APK path |
| * is encoded within the IDMAP. |
| * |
| * @param idmapPath Path to the IDMAP of an overlay APK. |
| * @param system When true, the APK is loaded as a system APK (framework). |
| * @return a new instance of ApkAssets. |
| * @throws IOException if a disk I/O error or parsing error occurred. |
| */ |
| public static @NonNull ApkAssets loadOverlayFromPath(@NonNull String idmapPath, boolean system) |
| throws IOException { |
| return new ApkAssets(idmapPath, system, false /*forceSharedLibrary*/, true /*overlay*/); |
| } |
| |
| private ApkAssets(@NonNull String path, boolean system, boolean forceSharedLib, boolean overlay) |
| throws IOException { |
| Preconditions.checkNotNull(path, "path"); |
| mNativePtr = nativeLoad(path, system, forceSharedLib, overlay); |
| mStringBlock = new StringBlock(nativeGetStringBlock(mNativePtr), true /*useSparse*/); |
| } |
| |
| private ApkAssets(@NonNull FileDescriptor fd, @NonNull String friendlyName, boolean system, |
| boolean forceSharedLib) throws IOException { |
| Preconditions.checkNotNull(fd, "fd"); |
| Preconditions.checkNotNull(friendlyName, "friendlyName"); |
| mNativePtr = nativeLoadFromFd(fd, friendlyName, system, forceSharedLib); |
| mStringBlock = new StringBlock(nativeGetStringBlock(mNativePtr), true /*useSparse*/); |
| } |
| |
| @UnsupportedAppUsage |
| public @NonNull String getAssetPath() { |
| synchronized (this) { |
| return nativeGetAssetPath(mNativePtr); |
| } |
| } |
| |
| CharSequence getStringFromPool(int idx) { |
| synchronized (this) { |
| return mStringBlock.get(idx); |
| } |
| } |
| |
| /** |
| * Retrieve a parser for a compiled XML file. This is associated with a single APK and |
| * <em>NOT</em> a full AssetManager. This means that shared-library references will not be |
| * dynamically assigned runtime package IDs. |
| * |
| * @param fileName The path to the file within the APK. |
| * @return An XmlResourceParser. |
| * @throws IOException if the file was not found or an error occurred retrieving it. |
| */ |
| public @NonNull XmlResourceParser openXml(@NonNull String fileName) throws IOException { |
| Preconditions.checkNotNull(fileName, "fileName"); |
| synchronized (this) { |
| long nativeXmlPtr = nativeOpenXml(mNativePtr, fileName); |
| try (XmlBlock block = new XmlBlock(null, nativeXmlPtr)) { |
| XmlResourceParser parser = block.newParser(); |
| // If nativeOpenXml doesn't throw, it will always return a valid native pointer, |
| // which makes newParser always return non-null. But let's be paranoid. |
| if (parser == null) { |
| throw new AssertionError("block.newParser() returned a null parser"); |
| } |
| return parser; |
| } |
| } |
| } |
| |
| /** |
| * Returns false if the underlying APK was changed since this ApkAssets was loaded. |
| */ |
| public boolean isUpToDate() { |
| synchronized (this) { |
| return nativeIsUpToDate(mNativePtr); |
| } |
| } |
| |
| @Override |
| public String toString() { |
| return "ApkAssets{path=" + getAssetPath() + "}"; |
| } |
| |
| @Override |
| protected void finalize() throws Throwable { |
| nativeDestroy(mNativePtr); |
| } |
| |
| private static native long nativeLoad( |
| @NonNull String path, boolean system, boolean forceSharedLib, boolean overlay) |
| throws IOException; |
| private static native long nativeLoadFromFd(@NonNull FileDescriptor fd, |
| @NonNull String friendlyName, boolean system, boolean forceSharedLib) |
| throws IOException; |
| private static native void nativeDestroy(long ptr); |
| private static native @NonNull String nativeGetAssetPath(long ptr); |
| private static native long nativeGetStringBlock(long ptr); |
| private static native boolean nativeIsUpToDate(long ptr); |
| private static native long nativeOpenXml(long ptr, @NonNull String fileName) throws IOException; |
| } |