include/vcl/checksum.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
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   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
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   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20
  21 #ifndef INCLUDED_VCL_INC_CHECKSUM_HXX
  22 #define INCLUDED_VCL_INC_CHECKSUM_HXX
  23
  24 #include <sal/config.h>
  25 #include <sal/types.h>
  26 #include <vcl/dllapi.h>
  27
  28 #define BITMAP_CHECKSUM_SIZE 8
  29
  30 typedef sal_uInt64   BitmapChecksum;
  31 typedef sal_uInt8   BitmapChecksumOctetArray[BITMAP_CHECKSUM_SIZE];
  32
  33 template< sal_uInt8 N = 0 >
  34 inline void BCToBCOA( BitmapChecksum n, BitmapChecksumOctetArray p )
  35 {
  36   p[N] = static_cast<sal_uInt8>(n >> ( 8 * N ));
  37   return BCToBCOA< N + 1 >( n, p );
  38 }
  39
  40 template<>
  41 inline void BCToBCOA< BITMAP_CHECKSUM_SIZE >( BitmapChecksum, BitmapChecksumOctetArray )
  42 {
  43     return;
  44 }
  45
  46 extern "C" {
  47
  48 /*========================================================================
  49  *
  50  * vcl_crc64 interface.
  51  *
  52  *======================================================================*/
  53 /** Evaluate CRC64 over given data.
  54
  55     This function evaluates the CRC polynomial 0xEDB88320.
  56
  57     @param  Crc    [in] CRC64 over previous data or zero.
  58     @param  Data   [in] data buffer.
  59     @param  DatLen [in] data buffer length.
  60     @return new CRC64 value.
  61  */
  62 VCL_DLLPUBLIC sal_uInt64 vcl_crc64 (
  63     sal_uInt64  Crc,
  64     const void *Data, sal_uInt32 DatLen
  65 )   SAL_THROW_EXTERN_C();
  66
  67
  68 const sal_uInt64* vcl_get_crc64_table();
  69
  70 }
  71
  72 inline BitmapChecksum vcl_get_checksum (
  73     BitmapChecksum  Checksum,
  74     const void *Data,
  75     sal_uInt32 DatLen
  76 )
  77 {
  78     return static_cast<BitmapChecksum>(vcl_crc64( Checksum, Data, DatLen ));
  79 }
  80
  81
  82 #endif // INCLUDED_VCL_INC_CHECKSUM_HXX
  83
  84 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */