Add write and read/write support to FileStream (renamed from FileInputStream)...

net/disk_cache/os_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 NET_DISK_CACHE_OS_FILE_H_
-#define NET_DISK_CACHE_OS_FILE_H_
-
-#include <string>
-
-#include "build/build_config.h"
-
-namespace disk_cache {
-
-#if defined(OS_WIN)
-#include <windows.h>
-typedef HANDLE OSFile;
-#elif defined(OS_POSIX)
-typedef int OSFile;
-const OSFile INVALID_HANDLE_VALUE = -1;
-#endif
-
-enum OSFileFlags {
-  OS_FILE_OPEN = 1,
-  OS_FILE_CREATE = 2,
-  OS_FILE_OPEN_ALWAYS = 4,    // May create a new file.
-  OS_FILE_CREATE_ALWAYS = 8,  // May overwrite an old file.
-  OS_FILE_READ = 16,
-  OS_FILE_WRITE = 32,
-  OS_FILE_SHARE_READ = 64,
-  OS_FILE_SHARE_WRITE = 128
-};
-
-// Creates or open the given file. If OS_FILE_OPEN_ALWAYS is used, and |created|
-// is provided, |created| will be set to true if the file was created or to
-// false in case the file was just opened.
-OSFile CreateOSFile(const std::wstring& name, int flags, bool* created);
-
-}  // namespace disk_cache
-
-#endif  // NET_DISK_CACHE_OS_FILE_H_