/* -*- 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 #include #include #include // 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(Data), DatLen); return Crc; } /* vim:set shiftwidth=4 softtabstop=4 expandtab: */