From 00e6cad71b5fa6e72d90e2dbd86c8e8c182ae02d Mon Sep 17 00:00:00 2001
From: RD42 <42702181+dashr9230@users.noreply.github.com>
Date: Mon, 13 Nov 2023 20:29:50 +0800
Subject: [PATCH] [saco] Implement `K_EncodeString` and `K_DecodeString`

---
 saco/runutil.cpp | 41 ++++++++++++++++++++++++++++++++++++++++-
 saco/runutil.h   |  3 +++
 2 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/saco/runutil.cpp b/saco/runutil.cpp
index 38d9e76..eb62cbf 100644
--- a/saco/runutil.cpp
+++ b/saco/runutil.cpp
@@ -234,4 +234,43 @@ void Util_Base64Encode( char *cpInput, char *cpOutput )
 	return;
 }
 
-//----------------------------------------------------
\ No newline at end of file
+//----------------------------------------------------
+// Simple rotate right 3 character encoding for
+// hiding strings in the exe.
+
+void K_EncodeString(char *szInput, char *szOutput)
+{
+	char b;
+
+	while(*szInput) {
+		b = *szInput;
+		_asm mov bl, b
+		_asm ror bl, 3
+		_asm mov b, bl
+		*szOutput = b;
+		szInput++;
+		szOutput++;
+	}
+	*szOutput = 0;
+}
+
+//----------------------------------------------------
+
+char * K_DecodeString(unsigned char *szInput)
+{
+	char b;
+	char *st = (char *)szInput;
+
+	while(*szInput) {
+		b = *szInput;
+		_asm mov bl, b
+		_asm rol bl, 3
+		_asm mov b, bl
+		*szInput = b;
+		szInput++;
+	}
+
+	return st;
+}
+
+//----------------------------------------------------
diff --git a/saco/runutil.h b/saco/runutil.h
index dadb861..1ca751b 100644
--- a/saco/runutil.h
+++ b/saco/runutil.h
@@ -9,4 +9,7 @@ char *Util_strrev(char *str);
 char * Util_itoa(int v, char *s, int r);
 void Util_Base64Encode( char *cpInput, char *cpOutput );
 
+char * K_DecodeString(unsigned char *szInput);
+void K_EncodeString(char *szInput, char *szOutput);
+
 //----------------------------------------------------
\ No newline at end of file