diff options
author | Paul Gilbert | 2019-10-27 21:17:49 -0700 |
---|---|---|
committer | Paul Gilbert | 2019-11-11 18:20:29 -0800 |
commit | 7ee61fa5d4a6dfd6880e48b83a8dae1d485d1e94 (patch) | |
tree | 0272e5cc42c21fe9e8ed59291594bcfad5e343b3 /engines/glk/archetype/crypt.h | |
parent | 0b3f59c3f87debc8fc25cb5e540be87904207cbb (diff) | |
download | scummvm-rg350-7ee61fa5d4a6dfd6880e48b83a8dae1d485d1e94.tar.gz scummvm-rg350-7ee61fa5d4a6dfd6880e48b83a8dae1d485d1e94.tar.bz2 scummvm-rg350-7ee61fa5d4a6dfd6880e48b83a8dae1d485d1e94.zip |
GLK: ARCHETYPE: Added converted files
Diffstat (limited to 'engines/glk/archetype/crypt.h')
-rw-r--r-- | engines/glk/archetype/crypt.h | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/engines/glk/archetype/crypt.h b/engines/glk/archetype/crypt.h new file mode 100644 index 0000000000..d978210e9a --- /dev/null +++ b/engines/glk/archetype/crypt.h @@ -0,0 +1,64 @@ +/* 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. + * + */ + +#ifndef ARCHETYPE_CRYPT +#define ARCHETYPE_CRYPT + +#include "common/scummsys.h" +#include "common/str.h" + +namespace Glk { +namespace Archetype { + +enum EncryptionType { + NONE, SIMPLE, PURPLE, UNPURPLE, COMPLEX, DEBUGGING_ON +}; + +extern byte CryptMask; +extern EncryptionType Encryption; + +/** + * Initializes fields local to the file + */ +extern void crypt_init(); + +extern void cryptinit(EncryptionType crypt_kind, uint seed); + +/** + * Encrypts or decrypts a string.Since all encryption methods are based on XOR, + * the same method both encrypts anddecrypts. + * If <method> is SIMPLE, the CryptMask is simply XORed with each byte in the string. + * If <method> is PURPLE, the CryptMask is changed each time after using it, + * by adding to it the lowest three bits of the result of the last encrypted + * byte.This way the mask changes frequently anddynamically in a way that + * is difficult to predict. + * If <method> is UNPURPLE, the same algorithm as PURPLE is used except that + * the next CryptMask must be determined before altering the byte under consideration. + * if <method> is COMPLEX, a pseudorandom sequence is used to alter the + * CryptMask.This can make prediction well-nigh impossible. + */ +extern void cryptstr(Common::String &s); + +} // End of namespace Archetype +} // End of namespace Glk + +#endif |