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Amiga MA Magazine 1998 #6
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amigamamagazinepolishissue1998.iso
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packery
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xpk_source
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xpkmaster
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checksum.c
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C/C++ Source or Header
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1996-10-19
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626b
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39 lines
#ifndef XPKMASTER_CHECKSUM_C
#define XPKMASTER_CHECKSUM_C
/* Routinesheader
Name: checksum.c
Main: xpkmaster
Versionstring: $VER: checksum.c 1.0 (05.10.96)
Author: SDI
Distribution: PD
Description: Simple checksum routines
1.0 05.10.96 : first real version
*/
#include <exec/types.h>
UBYTE hchecksum(STRPTR ptr, ULONG count)
{
register UBYTE sum = 0;
while(count-- > 0)
sum ^= *ptr++;
return sum;
}
UWORD cchecksum(ULONG *ptr, ULONG count)
{
register ULONG sum = 0;
while(count-- > 0)
sum ^= *ptr++;
return (UWORD) ((sum ^ (sum >> 16)) & 0xffff);
}
#endif /* XPKMASTER_CHECKSUM_C */