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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 09:06:44 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 09:06:44 +0000
commited5640d8b587fbcfed7dd7967f3de04b37a76f26 (patch)
tree7a5f7c6c9d02226d7471cb3cc8fbbf631b415303 /sal/rtl/crc.cxx
parentInitial commit. (diff)
downloadlibreoffice-ed5640d8b587fbcfed7dd7967f3de04b37a76f26.tar.xz
libreoffice-ed5640d8b587fbcfed7dd7967f3de04b37a76f26.zip
Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'sal/rtl/crc.cxx')
-rw-r--r--sal/rtl/crc.cxx45
1 files changed, 45 insertions, 0 deletions
diff --git a/sal/rtl/crc.cxx b/sal/rtl/crc.cxx
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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: */