From ed5640d8b587fbcfed7dd7967f3de04b37a76f26 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 11:06:44 +0200 Subject: Adding upstream version 4:7.4.7. Signed-off-by: Daniel Baumann --- sal/rtl/crc.cxx | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 sal/rtl/crc.cxx (limited to 'sal/rtl/crc.cxx') diff --git a/sal/rtl/crc.cxx b/sal/rtl/crc.cxx new file mode 100644 index 000000000..7912b15d0 --- /dev/null +++ b/sal/rtl/crc.cxx @@ -0,0 +1,45 @@ +/* -*- 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: */ -- cgit v1.2.3