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OS/2 Shareware BBS: 9 Archive
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OS2ARC_S.ZIP
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ARCCODE.C
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C/C++ Source or Header
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1987-10-14
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2KB
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46 lines
/* ARC - Archive utility - ARCCODE
$define(tag,$$segment(@1,$$index(@1,=)+1))#
$define(version,Version $tag(
TED_VERSION DB =1.02), created on $tag(
TED_DATE DB =01/20/86) at $tag(
TED_TIME DB =13:33:35))#
$undefine(tag)#
$version
(C) COPYRIGHT 1985 by System Enhancement Associates; ALL RIGHTS RESERVED
By: Thom Henderson
Description:
This file contains the routines used to encrypt and decrypt
data in an archive. The encryption method is nothing fancy,
being just a routine XOR, but it is used on the packed data,
and uses a variable length key. The end result is something
that is in theory crackable, but I'd hate to try it. It should
be more than sufficient for casual use.
Language:
Computer Innovations Optimizing C86
*/
#include <stdio.h>
#include "arc.h"
static char *p; /* password pointer */
setcode() /* get set for encoding/decoding */
{
p = password; /* reset password pointer */
}
int code(c) /* encode some character */
int c; /* character to encode */
{
if(p) /* if password is in use */
{ if(!*p) /* if we reached the end */
p = password; /* then wrap back to the start */
return c^*p++; /* very simple here */
}
else return c; /* else no encryption */
}