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

base/platform_file_win.cc

 // 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.
 
-#include "net/disk_cache/os_file.h"
+#include "base/platform_file.h"
 
 #include "base/logging.h"
 
-namespace disk_cache {
+namespace base {
 
-OSFile CreateOSFile(const std::wstring& name, int flags, bool* created) {
+PlatformFile CreatePlatformFile(const std::wstring& name,
+                                int flags,
+                                bool* created) {
   DWORD disposition = 0;
 
-  if (flags & OS_FILE_OPEN)
+  if (flags & PLATFORM_FILE_OPEN)
     disposition = OPEN_EXISTING;
 
-  if (flags & OS_FILE_CREATE) {
+  if (flags & PLATFORM_FILE_CREATE) {
     DCHECK(!disposition);
     disposition = CREATE_NEW;
   }
 
-  if (flags & OS_FILE_OPEN_ALWAYS) {
+  if (flags & PLATFORM_FILE_OPEN_ALWAYS) {
     DCHECK(!disposition);
     disposition = OPEN_ALWAYS;
   }
 
-  if (flags & OS_FILE_CREATE_ALWAYS) {
+  if (flags & PLATFORM_FILE_CREATE_ALWAYS) {
     DCHECK(!disposition);
     disposition = CREATE_ALWAYS;
   }
 
   if (!disposition) {
     NOTREACHED();
     return NULL;
   }
 
-  DWORD access = (flags & OS_FILE_READ) ? GENERIC_READ : 0;
-  if (flags & OS_FILE_WRITE)
+  DWORD access = (flags & PLATFORM_FILE_READ) ? GENERIC_READ : 0;
+  if (flags & PLATFORM_FILE_WRITE)
     access |= GENERIC_WRITE;
 
-  DWORD sharing = (flags & OS_FILE_SHARE_READ) ? FILE_SHARE_READ : 0;
-  if (flags & OS_FILE_SHARE_WRITE)
-    access |= FILE_SHARE_WRITE;
+  DWORD sharing = (flags & PLATFORM_FILE_EXCLUSIVE_READ) ? 0 : FILE_SHARE_READ;
+  if (!(flags & PLATFORM_FILE_EXCLUSIVE_WRITE))
+    sharing |= FILE_SHARE_WRITE;
 
-  HANDLE file = CreateFile(name.c_str(), access, sharing, NULL, disposition, 0,
-                           NULL);
+  DWORD create_flags = 0;
+  if (flags & PLATFORM_FILE_ASYNC)
+    create_flags |= FILE_FLAG_OVERLAPPED;
 
-  if ((flags & OS_FILE_OPEN_ALWAYS) && created &&
+  HANDLE file = CreateFile(name.c_str(), access, sharing, NULL, disposition,
+                           create_flags, NULL);
+
+  if ((flags & PLATFORM_FILE_OPEN_ALWAYS) && created &&
       INVALID_HANDLE_VALUE != file) {
     *created = (ERROR_ALREADY_EXISTS != GetLastError());
   }
 
   return file;
 }
 
 }  // namespace disk_cache