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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <sal/types.h>
#include <rtl/crc.h>
#include <cassert>
#include <zlib.h>
// Zlib's crc32() is very fast, so simply use that one instead
// of implementing this ourselves.
sal_uInt32 SAL_CALL rtl_crc32 (
sal_uInt32 Crc,
const void *Data, sal_uInt32 DatLen) SAL_THROW_EXTERN_C()
{
// Check that our types map to zlib correctly.
static_assert(sizeof(uLong) >= sizeof(sal_uInt32));
static_assert(sizeof(uInt) >= sizeof(sal_uInt32));
// Our API says that Crc should be initialized to 0, while
// zlib says it should be initialized with 'crc32(0,Z_NULL,0)',
// which however simply returns 0. Ensure this.
assert(crc32(0, Z_NULL, 0) == 0);
if (Data)
Crc = crc32( Crc, static_cast<const Bytef*>(Data), DatLen);
return Crc;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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