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      1 // Copyright 2013 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 "base/android/important_file_writer_android.h"
      6 
      7 #include <string>
      8 
      9 #include "base/android/jni_string.h"
     10 #include "base/files/important_file_writer.h"
     11 #include "base/threading/thread_restrictions.h"
     12 #include "jni/ImportantFileWriterAndroid_jni.h"
     13 
     14 namespace base {
     15 namespace android {
     16 
     17 static jboolean WriteFileAtomically(JNIEnv* env,
     18                                     jclass /* clazz */,
     19                                     jstring file_name,
     20                                     jbyteArray data) {
     21   // This is called on the UI thread during shutdown to save tab data, so
     22   // needs to enable IO.
     23   base::ThreadRestrictions::ScopedAllowIO allow_io;
     24   std::string native_file_name;
     25   base::android::ConvertJavaStringToUTF8(env, file_name, &native_file_name);
     26   base::FilePath path(native_file_name);
     27   int data_length = env->GetArrayLength(data);
     28   jbyte* native_data = env->GetByteArrayElements(data, NULL);
     29   std::string native_data_string(reinterpret_cast<char *>(native_data),
     30                                  data_length);
     31   bool result = base::ImportantFileWriter::WriteFileAtomically(
     32       path, native_data_string);
     33   env->ReleaseByteArrayElements(data, native_data, JNI_ABORT);
     34   return result;
     35 }
     36 
     37 bool RegisterImportantFileWriterAndroid(JNIEnv* env) {
     38   return RegisterNativesImpl(env);
     39 }
     40 
     41 }  // namespace android
     42 }  // namespace base
     43