1 files changed, 55 insertions, 0 deletions
diff --git a/chromium/base/android/apk_assets.cc b/chromium/base/android/apk_assets.cc
new file mode 100644
index 00000000000..7a1b1d181f8
--- /dev/null
+++ b/chromium/base/android/apk_assets.cc
@@ -0,0 +1,55 @@
+// Copyright 2015 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <jni.h>
+
+#include "base/android/apk_assets.h"
+
+#include "base/android/jni_array.h"
+#include "base/android/jni_string.h"
+#include "base/android/scoped_java_ref.h"
+#include "base/base_jni_headers/ApkAssets_jni.h"
+#include "base/file_descriptor_store.h"
+
+namespace base {
+namespace android {
+
+int OpenApkAsset(const std::string& file_path,
+                 const std::string& split_name,
+                 base::MemoryMappedFile::Region* region) {
+  // The AssetManager API of the NDK does not expose a method for accessing raw
+  // resources :(
+  JNIEnv* env = base::android::AttachCurrentThread();
+  ScopedJavaLocalRef<jlongArray> jarr =
+      Java_ApkAssets_open(env, ConvertUTF8ToJavaString(env, file_path),
+                          ConvertUTF8ToJavaString(env, split_name));
+  std::vector<jlong> results;
+  base::android::JavaLongArrayToLongVector(env, jarr, &results);
+  CHECK_EQ(3U, results.size());
+  int fd = static_cast<int>(results[0]);
+  region->offset = results[1];
+  // Not a checked_cast because open() may return -1.
+  region->size = static_cast<size_t>(results[2]);
+  return fd;
+}
+
+int OpenApkAsset(const std::string& file_path,
+                 base::MemoryMappedFile::Region* region) {
+  return OpenApkAsset(file_path, std::string(), region);
+}
+
+bool RegisterApkAssetWithFileDescriptorStore(const std::string& key,
+                                             const base::FilePath& file_path) {
+  base::MemoryMappedFile::Region region =
+      base::MemoryMappedFile::Region::kWholeFile;
+  int asset_fd = OpenApkAsset(file_path.value(), &region);
+  if (asset_fd == -1)
+    return false;
+  base::FileDescriptorStore::GetInstance().Set(key, base::ScopedFD(asset_fd),
+                                               region);
+  return true;
+}
+
+}  // namespace android
+}  // namespace base