android_webview/native/aw_assets.cc

   1 // Copyright 2014 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 "android_webview/native/aw_assets.h"
   8
   9 #include "base/android/jni_array.h"
  10 #include "base/android/jni_string.h"
  11 #include "base/android/scoped_java_ref.h"
  12 #include "jni/AwAssets_jni.h"
  13
  14 namespace android_webview {
  15 namespace AwAssets {
  16
  17 bool OpenAsset(const std::string& filename,
  18                int* fd,
  19                int64* offset,
  20                int64* size) {
  21   JNIEnv* env = base::android::AttachCurrentThread();
  22   ScopedJavaLocalRef<jlongArray> jarr = Java_AwAssets_openAsset(
  23       env,
  24       base::android::GetApplicationContext(),
  25       base::android::ConvertUTF8ToJavaString(env, filename).Release());
  26   std::vector<jlong> results;
  27   base::android::JavaLongArrayToLongVector(env, jarr.obj(), &results);
  28   DCHECK_EQ(3U, results.size());
  29   *fd = static_cast<int>(results[0]);
  30   *offset = results[1];
  31   *size = results[2];
  32   return *fd != -1;
  33 }
  34
  35 bool RegisterAssetWithGlobalDescriptors(base::GlobalDescriptors::Key key,
  36                                         const std::string& asset_filename) {
  37   int asset_fd = 0;
  38   int64 asset_off = 0;
  39   int64 asset_len = 0;
  40   bool result =
  41       AwAssets::OpenAsset(asset_filename, &asset_fd, &asset_off, &asset_len);
  42   if (result) {
  43     base::GlobalDescriptors::GetInstance()->Set(
  44         key, asset_fd, base::MemoryMappedFile::Region(asset_off, asset_len));
  45   }
  46   return result;
  47 }
  48
  49 }  // namespace AwAssets
  50
  51 bool RegisterAwAssets(JNIEnv* env) {
  52   return RegisterNativesImpl(env);
  53 }
  54
  55 }  // namespace android_webview