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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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 Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "glk/archetype/crypt.h"
#include "glk/archetype/archetype.h"
namespace Glk {
namespace Archetype {
byte CryptMask;
EncryptionType Encryption;
void crypt_init() {
Encryption = NONE;
CryptMask = 0x55;
}
void cryptinit(EncryptionType crypt_kind, uint seed) {
CryptMask = seed & 0xff;
Encryption = crypt_kind;
if (Encryption == COMPLEX)
g_vm->setRandomNumberSeed(seed);
}
void cryptstr(Common::String &s) {
byte nextMask;
switch (Encryption) {
case SIMPLE:
for (uint i = 0; i < s.size(); ++i)
s.setChar(s[i] ^ CryptMask, i);
break;
case PURPLE:
for (uint i = 0; i < s.size(); ++i) {
s.setChar(s[i] ^ CryptMask, i);
CryptMask += s[i] & 7;
}
break;
case UNPURPLE:
for (uint i = 0; i < s.size(); ++i) {
nextMask = CryptMask + (s[i] & 7);
s.setChar(s[i] ^ CryptMask, i);
CryptMask = nextMask;
}
break;
case COMPLEX:
for (uint i = 0; i < s.size(); ++i) {
s.setChar(s[i] ^ CryptMask, i);
CryptMask = g_vm->getRandomNumber(0x100);
}
break;
default:
break;
}
}
} // End of namespace Archetype
} // End of namespace Glk
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