michael@0: // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #include "base/platform_file.h"
michael@0: 
michael@0: #include "base/logging.h"
michael@0: 
michael@0: namespace base {
michael@0: 
michael@0: PlatformFile CreatePlatformFile(const std::wstring& name,
michael@0:                                 int flags,
michael@0:                                 bool* created) {
michael@0:   DWORD disposition = 0;
michael@0: 
michael@0:   if (flags & PLATFORM_FILE_OPEN)
michael@0:     disposition = OPEN_EXISTING;
michael@0: 
michael@0:   if (flags & PLATFORM_FILE_CREATE) {
michael@0:     DCHECK(!disposition);
michael@0:     disposition = CREATE_NEW;
michael@0:   }
michael@0: 
michael@0:   if (flags & PLATFORM_FILE_OPEN_ALWAYS) {
michael@0:     DCHECK(!disposition);
michael@0:     disposition = OPEN_ALWAYS;
michael@0:   }
michael@0: 
michael@0:   if (flags & PLATFORM_FILE_CREATE_ALWAYS) {
michael@0:     DCHECK(!disposition);
michael@0:     disposition = CREATE_ALWAYS;
michael@0:   }
michael@0: 
michael@0:   if (!disposition) {
michael@0:     NOTREACHED();
michael@0:     return NULL;
michael@0:   }
michael@0: 
michael@0:   DWORD access = (flags & PLATFORM_FILE_READ) ? GENERIC_READ : 0;
michael@0:   if (flags & PLATFORM_FILE_WRITE)
michael@0:     access |= GENERIC_WRITE;
michael@0: 
michael@0:   DWORD sharing = (flags & PLATFORM_FILE_EXCLUSIVE_READ) ? 0 : FILE_SHARE_READ;
michael@0:   if (!(flags & PLATFORM_FILE_EXCLUSIVE_WRITE))
michael@0:     sharing |= FILE_SHARE_WRITE;
michael@0: 
michael@0:   DWORD create_flags = 0;
michael@0:   if (flags & PLATFORM_FILE_ASYNC)
michael@0:     create_flags |= FILE_FLAG_OVERLAPPED;
michael@0: 
michael@0:   HANDLE file = CreateFile(name.c_str(), access, sharing, NULL, disposition,
michael@0:                            create_flags, NULL);
michael@0: 
michael@0:   if ((flags & PLATFORM_FILE_OPEN_ALWAYS) && created &&
michael@0:       INVALID_HANDLE_VALUE != file) {
michael@0:     *created = (ERROR_ALREADY_EXISTS != GetLastError());
michael@0:   }
michael@0: 
michael@0:   return file;
michael@0: }
michael@0: 
michael@0: }  // namespace disk_cache