53 lines
1.8 KiB
C
53 lines
1.8 KiB
C
/*
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* $Id$
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*/
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/*
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* Harbour Project source code:
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* CT_CHECKSUM() CA-Tools function
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*
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* Copyright 1999 Victor Szakats <info@szelvesz.hu>
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* www - http://www.harbour-project.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version, with one exception:
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*
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* The exception is that if you link the Harbour Runtime Library (HRL)
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* and/or the Harbour Virtual Machine (HVM) with other files to produce
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* an executable, this does not by itself cause the resulting executable
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* to be covered by the GNU General Public License. Your use of that
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* executable is in no way restricted on account of linking the HRL
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* and/or HVM code into it.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA (or visit
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* their web site at http://www.gnu.org/).
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*
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*/
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#include "hbapi.h"
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HB_FUNC( CT_CHECKSUM )
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{
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BYTE * pbyString = ( BYTE * ) hb_parc( 1 );
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ULONG ulLen = hb_parclen( 1 );
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ULONG ulPos;
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ULONG ulResult = 0;
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for( ulPos = 0; ulPos < ulLen; ulPos++ )
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ulResult += ( ( ULONG ) ( pbyString[ ulPos ] + ( ULONG ) ( pbyString[ ulPos + 1 ] * 256 ) ) ) & 0xFFFF;
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/* NOTE: Using hb_retnd() instead of hb_retnl() to always return a
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positive value. */
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hb_retnd( ( ULONG ) ( ( ulResult & 0x00FFFFFF ) | ( ( ulLen & 0xFF ) << 24 ) ) );
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}
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