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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
// 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 "base/platform_file.h"
#include "base/logging.h"
namespace base {
PlatformFile CreatePlatformFile(const std::wstring& name,
int flags,
bool* created) {
DWORD disposition = 0;
if (flags & PLATFORM_FILE_OPEN)
disposition = OPEN_EXISTING;
if (flags & PLATFORM_FILE_CREATE) {
DCHECK(!disposition);
disposition = CREATE_NEW;
}
if (flags & PLATFORM_FILE_OPEN_ALWAYS) {
DCHECK(!disposition);
disposition = OPEN_ALWAYS;
}
if (flags & PLATFORM_FILE_CREATE_ALWAYS) {
DCHECK(!disposition);
disposition = CREATE_ALWAYS;
}
if (!disposition) {
NOTREACHED();
return NULL;
}
DWORD access = (flags & PLATFORM_FILE_READ) ? GENERIC_READ : 0;
if (flags & PLATFORM_FILE_WRITE)
access |= GENERIC_WRITE;
DWORD sharing = (flags & PLATFORM_FILE_EXCLUSIVE_READ) ? 0 : FILE_SHARE_READ;
if (!(flags & PLATFORM_FILE_EXCLUSIVE_WRITE))
sharing |= FILE_SHARE_WRITE;
DWORD create_flags = 0;
if (flags & PLATFORM_FILE_ASYNC)
create_flags |= FILE_FLAG_OVERLAPPED;
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
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