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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 
OpenApkAsset(const std::string & file_path,base::MemoryMappedFile::Region * region)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 
RegisterApkAssetWithFileDescriptorStore(const std::string & key,const base::FilePath & file_path)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(), &region);
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