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// 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/logging.h"
namespace disk_cache {
OSFile CreateOSFile(const std::wstring& name, int flags, bool* created) {
DWORD disposition = 0;
if (flags & OS_FILE_OPEN)
disposition = OPEN_EXISTING;
if (flags & OS_FILE_CREATE) {
DCHECK(!disposition);
disposition = CREATE_NEW;
}
if (flags & OS_FILE_OPEN_ALWAYS) {
DCHECK(!disposition);
disposition = OPEN_ALWAYS;
}
if (flags & OS_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)
access |= GENERIC_WRITE;
DWORD sharing = (flags & OS_FILE_SHARE_READ) ? FILE_SHARE_READ : 0;
if (flags & OS_FILE_SHARE_WRITE)
access |= FILE_SHARE_WRITE;
HANDLE file = CreateFile(name.c_str(), access, sharing, NULL, disposition, 0,
NULL);
if ((flags & OS_FILE_OPEN_ALWAYS) && created &&
INVALID_HANDLE_VALUE != file) {
*created = (ERROR_ALREADY_EXISTS != GetLastError());
}
return file;
}
} // namespace disk_cache
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