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48 lines
1.6 KiB
C++
48 lines
1.6 KiB
C++
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include <jni.h>
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#include "base/android/apk_assets.h"
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#include "base/android/jni_array.h"
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#include "base/android/jni_string.h"
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#include "base/android/scoped_java_ref.h"
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#include "base/file_descriptor_store.h"
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#include "jni/ApkAssets_jni.h"
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namespace base {
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namespace android {
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int OpenApkAsset(const std::string& file_path,
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base::MemoryMappedFile::Region* region) {
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// The AssetManager API of the NDK does not expose a method for accessing raw
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// resources :(
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JNIEnv* env = base::android::AttachCurrentThread();
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ScopedJavaLocalRef<jlongArray> jarr = Java_ApkAssets_open(
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env, base::android::ConvertUTF8ToJavaString(env, file_path));
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std::vector<jlong> results;
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base::android::JavaLongArrayToLongVector(env, jarr.obj(), &results);
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CHECK_EQ(3U, results.size());
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int fd = static_cast<int>(results[0]);
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region->offset = results[1];
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region->size = results[2];
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return fd;
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}
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bool RegisterApkAssetWithFileDescriptorStore(const std::string& key,
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const base::FilePath& file_path) {
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base::MemoryMappedFile::Region region =
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base::MemoryMappedFile::Region::kWholeFile;
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int asset_fd = OpenApkAsset(file_path.value(), ®ion);
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if (asset_fd == -1)
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return false;
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base::FileDescriptorStore::GetInstance().Set(key, base::ScopedFD(asset_fd),
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region);
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return true;
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}
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} // namespace android
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} // namespace base
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