Port some things in browser/{download,history}, minor things in common....

chrome/browser/download/save_file.h

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_DOWNLOAD_SAVE_FILE_H__
 #define CHROME_BROWSER_DOWNLOAD_SAVE_FILE_H__
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/scoped_ptr.h"
 #include "chrome/browser/download/save_types.h"
 
 // SaveFile ----------------------------------------------------------------
 
 // These objects live exclusively on the file thread and handle the writing
 // operations for one save item. These objects live only for the duration that
 // the saving job is 'in progress': once the saving job has been completed or
 // canceled, the SaveFile is destroyed. One SaveFile object represents one item
 // in a save session.
 class SaveFile {
  public:
   explicit SaveFile(const SaveFileCreateInfo* info);
   ~SaveFile();
 
   // Write a new chunk of data to the file. Returns true on success.
-  bool AppendDataToFile(const char* data, int data_len);
+  bool AppendDataToFile(const char* data, size_t data_len);
 
   // Abort the saving job and automatically close the file.
   void Cancel();
 
   // Rename the saved file. Returns 'true' if the rename was successful.
   bool Rename(const std::wstring& full_path);
 
   void Finish();
 
   // Accessors.
   int save_id() const { return info_->save_id; }
   int render_process_id() const { return info_->render_process_id; }
   int render_view_id() const { return info_->render_view_id; }
   int request_id() const { return info_->request_id; }
   SaveFileCreateInfo::SaveFileSource save_source() const {
     return info_->save_source;
   }
 
   int64 bytes_so_far() const { return bytes_so_far_; }
   std::wstring full_path() const { return full_path_; }
   bool path_renamed() const { return path_renamed_; }
   bool in_progress() const { return in_progress_; }
 
  private:
   // Open or Close the OS file handle. The file is opened in the constructor
   // based on creation information passed to it, and automatically closed in
   // the destructor.
   void Close();
-  bool Open(const wchar_t* open_mode);
+  bool Open(const char* open_mode);
 
   scoped_ptr<const SaveFileCreateInfo> info_;
 
   // OS file handle for writing
   FILE* file_;
 
   // Amount of data received up to this point. We may not know in advance how
   // much data to expect since some servers don't provide that information.
   int64 bytes_so_far_;
 
   // Full path to the saved file including the file name.
   std::wstring full_path_;
 
   // Whether the saved file is still using its initial temporary path.
   bool path_renamed_;
 
   // Whether the saved file is still receiving data.
   bool in_progress_;
 
   DISALLOW_EVIL_CONSTRUCTORS(SaveFile);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_SAVE_FILE_H__