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