1 // Copyright 2015 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include <jni.h> 6 7 #include "base/android/apk_assets.h" 8 9 #include "base/android/context_utils.h" 10 #include "base/android/jni_array.h" 11 #include "base/android/jni_string.h" 12 #include "base/android/scoped_java_ref.h" 13 #include "base/file_descriptor_store.h" 14 #include "jni/ApkAssets_jni.h" 15 16 namespace base { 17 namespace android { 18 19 int OpenApkAsset(const std::string& file_path, 20 base::MemoryMappedFile::Region* region) { 21 // The AssetManager API of the NDK does not expose a method for accessing raw 22 // resources :( 23 JNIEnv* env = base::android::AttachCurrentThread(); 24 ScopedJavaLocalRef<jlongArray> jarr = Java_ApkAssets_open( 25 env, base::android::GetApplicationContext(), 26 base::android::ConvertUTF8ToJavaString(env, file_path)); 27 std::vector<jlong> results; 28 base::android::JavaLongArrayToLongVector(env, jarr.obj(), &results); 29 CHECK_EQ(3U, results.size()); 30 int fd = static_cast<int>(results[0]); 31 region->offset = results[1]; 32 region->size = results[2]; 33 return fd; 34 } 35 36 bool RegisterApkAssetWithFileDescriptorStore(const std::string& key, 37 const base::FilePath& file_path) { 38 base::MemoryMappedFile::Region region = 39 base::MemoryMappedFile::Region::kWholeFile; 40 int asset_fd = OpenApkAsset(file_path.value(), ®ion); 41 if (asset_fd == -1) 42 return false; 43 base::FileDescriptorStore::GetInstance().Set(key, base::ScopedFD(asset_fd), 44 region); 45 return true; 46 } 47 48 } // namespace android 49 } // namespace base 50
