1 files changed, 84 insertions, 0 deletions
diff --git a/include/vcl/checksum.hxx b/include/vcl/checksum.hxx
new file mode 100644
index 000000000..34d8ed77a
--- /dev/null
+++ b/include/vcl/checksum.hxx
@@ -0,0 +1,84 @@
+/* -*- 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 .
+ */
+
+
+#ifndef INCLUDED_VCL_INC_CHECKSUM_HXX
+#define INCLUDED_VCL_INC_CHECKSUM_HXX
+
+#include <sal/config.h>
+#include <sal/types.h>
+#include <vcl/dllapi.h>
+
+#define BITMAP_CHECKSUM_SIZE 8
+
+typedef sal_uInt64   BitmapChecksum;
+typedef sal_uInt8   BitmapChecksumOctetArray[BITMAP_CHECKSUM_SIZE];
+
+template< sal_uInt8 N = 0 >
+inline void BCToBCOA( BitmapChecksum n, BitmapChecksumOctetArray p )
+{
+  p[N] = static_cast<sal_uInt8>(n >> ( 8 * N ));
+  return BCToBCOA< N + 1 >( n, p );
+}
+
+template<>
+inline void BCToBCOA< BITMAP_CHECKSUM_SIZE >( BitmapChecksum, BitmapChecksumOctetArray )
+{
+    return;
+}
+
+extern "C" {
+
+/*========================================================================
+ *
+ * vcl_crc64 interface.
+ *
+ *======================================================================*/
+/** Evaluate CRC64 over given data.
+
+    This function evaluates the CRC polynomial 0xEDB88320.
+
+    @param  Crc    [in] CRC64 over previous data or zero.
+    @param  Data   [in] data buffer.
+    @param  DatLen [in] data buffer length.
+    @return new CRC64 value.
+ */
+VCL_DLLPUBLIC sal_uInt64 vcl_crc64 (
+    sal_uInt64  Crc,
+    const void *Data, sal_uInt32 DatLen
+)   SAL_THROW_EXTERN_C();
+
+
+const sal_uInt64* vcl_get_crc64_table();
+
+}
+
+inline BitmapChecksum vcl_get_checksum (
+    BitmapChecksum  Checksum,
+    const void *Data,
+    sal_uInt32 DatLen
+)
+{
+    return static_cast<BitmapChecksum>(vcl_crc64( Checksum, Data, DatLen ));
+}
+
+
+#endif // INCLUDED_VCL_INC_CHECKSUM_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */