From 101d30556e5aac799a93fda418376f7106cc6798 Mon Sep 17 00:00:00 2001
From: anon <anon>
Date: Sun, 2 Apr 2023 12:28:55 +0100
Subject: [PATCH] GetCodepointNext: Add 10xxxxxx checks to multibyte encodings.

---
 src/rtext.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/rtext.c b/src/rtext.c
index c988533d0..dda994874 100644
--- a/src/rtext.c
+++ b/src/rtext.c
@@ -1894,18 +1894,21 @@ int GetCodepointNext(const char *text, int *codepointSize)
     if (0xf0 == (0xf8 & ptr[0]))
     {
         // 4 byte UTF-8 codepoint
+        if(((ptr[1] & 0xC0) ^ 0x80) || ((ptr[2] & 0xC0) ^ 0x80) || ((ptr[3] & 0xC0) ^ 0x80)) { return codepoint; } //10xxxxxx checks
         codepoint = ((0x07 & ptr[0]) << 18) | ((0x3f & ptr[1]) << 12) | ((0x3f & ptr[2]) << 6) | (0x3f & ptr[3]);
         *codepointSize = 4;
     }
     else if (0xe0 == (0xf0 & ptr[0]))
     {
         // 3 byte UTF-8 codepoint */
+        if(((ptr[1] & 0xC0) ^ 0x80) || ((ptr[2] & 0xC0) ^ 0x80)) { return codepoint; } //10xxxxxx checks
         codepoint = ((0x0f & ptr[0]) << 12) | ((0x3f & ptr[1]) << 6) | (0x3f & ptr[2]);
         *codepointSize = 3;
     }
     else if (0xc0 == (0xe0 & ptr[0]))
     {
         // 2 byte UTF-8 codepoint
+        if((ptr[1] & 0xC0) ^ 0x80) { return codepoint; } //10xxxxxx checks
         codepoint = ((0x1f & ptr[0]) << 6) | (0x3f & ptr[1]);
         *codepointSize = 2;
     }