source: golgotha/src/i4/checksum/checksum.cc @ 80

Last change on this file since 80 was 80, checked in by Sam Hocevar, 12 years ago
  • Adding the Golgotha source code. Not sure what's going to be interesting in there, but since it's all public domain, there's certainly stuff to pick up.
File size: 960 bytes
Line 
1/********************************************************************** <BR>
2  This file is part of Crack dot Com's free source code release of
3  Golgotha. <a href="http://www.crack.com/golgotha_release"> <BR> for
4  information about compiling & licensing issues visit this URL</a>
5  <PRE> If that doesn't help, contact Jonathan Clark at
6  golgotha_source@usa.net (Subject should have "GOLG" in it)
7***********************************************************************/
8
9#include "arch.hh"
10
11w32 i4_check_sum32(void *buf, w32 buf_len)
12{
13  w8 c1=0,c2=0,c3=0,c4=0;
14  while (buf_len)
15  {
16    c1+=*((w8 *)buf);
17    c2+=c1;
18    buf=(void *)(((w8 *)buf)+1);
19    c3+=c2;
20    c4+=c3;
21    buf_len--;
22  }
23  return (c1|(c2<<8)|(c3<<16)|(c4<<24));
24}
25
26w16 i4_check_sum16(void *buf, w32 buf_len)
27{
28  w8 c1=0,c2=0;
29
30  while (buf_len)
31  {
32    c1+=*((w8 *)buf);
33    buf=(void *)(((w8 *)buf)+1);
34    c2+=c1;
35  }
36  return (c1|(c2<<8));
37}
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