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

base/platform_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_
+#ifndef BASE_PLATFORM_FILE_H_
+#define BASE_PLATFORM_FILE_H_
+
+#include "build/build_config.h"
+#if defined(OS_WIN)
+#include <windows.h>
+#endif
 
 #include <string>
 
-#include "build/build_config.h"
-
-namespace disk_cache {
+namespace base {
 
 #if defined(OS_WIN)
-#include <windows.h>
-typedef HANDLE OSFile;
+typedef HANDLE PlatformFile;
+const PlatformFile kInvalidPlatformFileValue = INVALID_HANDLE_VALUE;
 #elif defined(OS_POSIX)
-typedef int OSFile;
-const OSFile INVALID_HANDLE_VALUE = -1;
+typedef int PlatformFile;
+const PlatformFile kInvalidPlatformFileValue = -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
+enum PlatformFileFlags {
+  PLATFORM_FILE_OPEN = 1,
+  PLATFORM_FILE_CREATE = 2,
+  PLATFORM_FILE_OPEN_ALWAYS = 4,    // May create a new file.
+  PLATFORM_FILE_CREATE_ALWAYS = 8,  // May overwrite an old file.
+  PLATFORM_FILE_READ = 16,
+  PLATFORM_FILE_WRITE = 32,
+  PLATFORM_FILE_EXCLUSIVE_READ = 64,  // EXCLUSIVE is opposite of Windows SHARE
+  PLATFORM_FILE_EXCLUSIVE_WRITE = 128,
+  PLATFORM_FILE_ASYNC = 256
 };
 
-// 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);
+// Creates or open the given file. If PLATFORM_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.
+PlatformFile CreatePlatformFile(const std::wstring& name,
+                                int flags,
+                                bool* created);
 
-}  // namespace disk_cache
+}  // namespace base
 
-#endif  // NET_DISK_CACHE_OS_FILE_H_
+#endif  // BASE_PLATFORM_FILE_H_