include/vcl/checksum.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
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   9  * This file incorporates work covered by the following license notice:
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  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 <tools/solar.h>
  27 #include <vcl/dllapi.h>
  28
  29 #define BITMAP_CHECKSUM_SIZE 8
  30
  31 typedef sal_uInt64   BitmapChecksum;
  32 typedef sal_uInt8   BitmapChecksumOctetArray[BITMAP_CHECKSUM_SIZE];
  33
  34 template< sal_uInt8 N = 0 >
  35 inline void BCToBCOA( BitmapChecksum n, BitmapChecksumOctetArray p )
  36 {
  37   p[N] = static_cast<sal_uInt8>(n >> ( 8 * N ));
  38   return BCToBCOA< N + 1 >( n, p );
  39 }
  40
  41 template<>
  42 inline void BCToBCOA< BITMAP_CHECKSUM_SIZE >( BitmapChecksum, BitmapChecksumOctetArray )
  43 {
  44     return;
  45 }
  46
  47 extern "C" {
  48
  49 /*========================================================================
  50  *
  51  * vcl_crc64 interface.
  52  *
  53  *======================================================================*/
  54 /** Evaluate CRC64 over given data.
  55
  56     This function evaluates the CRC polynomial 0xEDB88320.
  57
  58     @param  Crc    [in] CRC64 over previous data or zero.
  59     @param  Data   [in] data buffer.
  60     @param  DatLen [in] data buffer length.
  61     @return new CRC64 value.
  62  */
  63 VCL_DLLPUBLIC sal_uInt64 SAL_CALL vcl_crc64 (
  64     sal_uInt64  Crc,
  65     const void *Data, sal_uInt32 DatLen
  66 )   SAL_THROW_EXTERN_C();
  67
  68
  69 VCL_DLLPUBLIC const sal_uInt64* vcl_get_crc64_table();
  70
  71 }
  72
  73 inline BitmapChecksum vcl_get_checksum (
  74     BitmapChecksum  Checksum,
  75     const void *Data,
  76     sal_uInt32 DatLen
  77 )
  78 {
  79     return (BitmapChecksum)(vcl_crc64( Checksum, Data, DatLen ));
  80 }
  81
  82
  83 #endif // INCLUDED_VCL_INC_CHECKSUM_HXX
  84
  85 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */