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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#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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