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/*\
* Rotix - A program to generate rotational obfuscations
* Copyright (C) 2001 Sjoerd Hemminga
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
* USA
\*/
/*\
* Define the flags used.
*
* This is upwards compatible. Programs using this interface will still be
* able to connect to later versions of this file. Other flags will be
* added when needed.
\*/
#define ROTATE_RIGHT_FLAG 1
/*\
* This function rotates rotar by rotor. NOTE that rotar contains the
* rotated contents after running this function.
\*/
void rotate (int rotor, char *rotar, char flags)
{
int i;
if (!(flags & ROTATE_RIGHT_FLAG)) {
/* Instead of rotate right, rotate left. */
rotor = -rotor;
}
/* Make sure that rotor-values over 127 don't cause problems. */
rotor %= 26;
/* Convert negative rotor values to a positive equivalent. */
if (rotor < 0) {
rotor += 26;
}
for (i = 0; rotar[i]; i++) {
if ( (rotar[i] >= 65) && (rotar[i] <= 90) ) {
rotar[i] -= 65;
rotar[i] += rotor;
rotar[i] %= 26;
rotar[i] += 65;
}
if ( (rotar[i] >= 97) && (rotar[i] <= 122) ) {
rotar[i] -= 97;
rotar[i] += rotor;
rotar[i] %= 26;
rotar[i] += 97;
}
}
}
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