1 /* 2 * Copyright (C) 2017 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 #define ATRACE_TAG ATRACE_TAG_RESOURCES 18 19 #include "android-base/macros.h" 20 #include "android-base/stringprintf.h" 21 #include "android-base/unique_fd.h" 22 #include "androidfw/ApkAssets.h" 23 #include "utils/misc.h" 24 #include "utils/Trace.h" 25 26 #include "core_jni_helpers.h" 27 #include "jni.h" 28 #include "nativehelper/ScopedUtfChars.h" 29 30 using ::android::base::unique_fd; 31 32 namespace android { 33 34 static jlong NativeLoad(JNIEnv* env, jclass /*clazz*/, jstring java_path, jboolean system, 35 jboolean force_shared_lib, jboolean overlay) { 36 ScopedUtfChars path(env, java_path); 37 if (path.c_str() == nullptr) { 38 return 0; 39 } 40 41 ATRACE_NAME(base::StringPrintf("LoadApkAssets(%s)", path.c_str()).c_str()); 42 43 std::unique_ptr<const ApkAssets> apk_assets; 44 if (overlay) { 45 apk_assets = ApkAssets::LoadOverlay(path.c_str(), system); 46 } else if (force_shared_lib) { 47 apk_assets = ApkAssets::LoadAsSharedLibrary(path.c_str(), system); 48 } else { 49 apk_assets = ApkAssets::Load(path.c_str(), system); 50 } 51 52 if (apk_assets == nullptr) { 53 std::string error_msg = base::StringPrintf("Failed to load asset path %s", path.c_str()); 54 jniThrowException(env, "java/io/IOException", error_msg.c_str()); 55 return 0; 56 } 57 return reinterpret_cast<jlong>(apk_assets.release()); 58 } 59 60 static jlong NativeLoadFromFd(JNIEnv* env, jclass /*clazz*/, jobject file_descriptor, 61 jstring friendly_name, jboolean system, jboolean force_shared_lib) { 62 ScopedUtfChars friendly_name_utf8(env, friendly_name); 63 if (friendly_name_utf8.c_str() == nullptr) { 64 return 0; 65 } 66 67 ATRACE_NAME(base::StringPrintf("LoadApkAssetsFd(%s)", friendly_name_utf8.c_str()).c_str()); 68 69 int fd = jniGetFDFromFileDescriptor(env, file_descriptor); 70 if (fd < 0) { 71 jniThrowException(env, "java/lang/IllegalArgumentException", "Bad FileDescriptor"); 72 return 0; 73 } 74 75 unique_fd dup_fd(::dup(fd)); 76 if (dup_fd < 0) { 77 jniThrowIOException(env, errno); 78 return 0; 79 } 80 81 std::unique_ptr<const ApkAssets> apk_assets = ApkAssets::LoadFromFd(std::move(dup_fd), 82 friendly_name_utf8.c_str(), 83 system, force_shared_lib); 84 if (apk_assets == nullptr) { 85 std::string error_msg = base::StringPrintf("Failed to load asset path %s from fd %d", 86 friendly_name_utf8.c_str(), dup_fd.get()); 87 jniThrowException(env, "java/io/IOException", error_msg.c_str()); 88 return 0; 89 } 90 return reinterpret_cast<jlong>(apk_assets.release()); 91 } 92 93 static void NativeDestroy(JNIEnv* /*env*/, jclass /*clazz*/, jlong ptr) { 94 delete reinterpret_cast<ApkAssets*>(ptr); 95 } 96 97 static jstring NativeGetAssetPath(JNIEnv* env, jclass /*clazz*/, jlong ptr) { 98 const ApkAssets* apk_assets = reinterpret_cast<const ApkAssets*>(ptr); 99 return env->NewStringUTF(apk_assets->GetPath().c_str()); 100 } 101 102 static jlong NativeGetStringBlock(JNIEnv* /*env*/, jclass /*clazz*/, jlong ptr) { 103 const ApkAssets* apk_assets = reinterpret_cast<const ApkAssets*>(ptr); 104 return reinterpret_cast<jlong>(apk_assets->GetLoadedArsc()->GetStringPool()); 105 } 106 107 static jboolean NativeIsUpToDate(JNIEnv* /*env*/, jclass /*clazz*/, jlong ptr) { 108 const ApkAssets* apk_assets = reinterpret_cast<const ApkAssets*>(ptr); 109 (void)apk_assets; 110 return JNI_TRUE; 111 } 112 113 static jlong NativeOpenXml(JNIEnv* env, jclass /*clazz*/, jlong ptr, jstring file_name) { 114 ScopedUtfChars path_utf8(env, file_name); 115 if (path_utf8.c_str() == nullptr) { 116 return 0; 117 } 118 119 const ApkAssets* apk_assets = reinterpret_cast<const ApkAssets*>(ptr); 120 std::unique_ptr<Asset> asset = apk_assets->Open(path_utf8.c_str(), 121 Asset::AccessMode::ACCESS_RANDOM); 122 if (asset == nullptr) { 123 jniThrowException(env, "java/io/FileNotFoundException", path_utf8.c_str()); 124 return 0; 125 } 126 127 // DynamicRefTable is only needed when looking up resource references. Opening an XML file 128 // directly from an ApkAssets has no notion of proper resource references. 129 std::unique_ptr<ResXMLTree> xml_tree = util::make_unique<ResXMLTree>(nullptr /*dynamicRefTable*/); 130 status_t err = xml_tree->setTo(asset->getBuffer(true), asset->getLength(), true); 131 asset.reset(); 132 133 if (err != NO_ERROR) { 134 jniThrowException(env, "java/io/FileNotFoundException", "Corrupt XML binary file"); 135 return 0; 136 } 137 return reinterpret_cast<jlong>(xml_tree.release()); 138 } 139 140 // JNI registration. 141 static const JNINativeMethod gApkAssetsMethods[] = { 142 {"nativeLoad", "(Ljava/lang/String;ZZZ)J", (void*)NativeLoad}, 143 {"nativeLoadFromFd", "(Ljava/io/FileDescriptor;Ljava/lang/String;ZZ)J", 144 (void*)NativeLoadFromFd}, 145 {"nativeDestroy", "(J)V", (void*)NativeDestroy}, 146 {"nativeGetAssetPath", "(J)Ljava/lang/String;", (void*)NativeGetAssetPath}, 147 {"nativeGetStringBlock", "(J)J", (void*)NativeGetStringBlock}, 148 {"nativeIsUpToDate", "(J)Z", (void*)NativeIsUpToDate}, 149 {"nativeOpenXml", "(JLjava/lang/String;)J", (void*)NativeOpenXml}, 150 }; 151 152 int register_android_content_res_ApkAssets(JNIEnv* env) { 153 return RegisterMethodsOrDie(env, "android/content/res/ApkAssets", gApkAssetsMethods, 154 arraysize(gApkAssetsMethods)); 155 } 156 157 } // namespace android 158
