1 files changed, 82 insertions, 0 deletions
diff --git a/engines/glk/archetype/crypt.cpp b/engines/glk/archetype/crypt.cpp
new file mode 100644
index 0000000000..d99dab0907
--- /dev/null
+++ b/engines/glk/archetype/crypt.cpp
@@ -0,0 +1,82 @@
+/* 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