Use simdutf to validate utf8 in websocket server (#11140)

packages/bun-uws/src/WebSocketProtocol.h

@@ -25,6 +25,9 @@
 #include <cstdlib>
 #include <string_view>
 
+// bun-specific
+#include "simdutf.h"
+
 namespace uWS {
 
 /* We should not overcomplicate these */
@@ -109,50 +112,9 @@ T cond_byte_swap(T value) {
     return value;
 }
 
-// Based on utf8_check.c by Markus Kuhn, 2005
-// https://www.cl.cam.ac.uk/~mgk25/ucs/utf8_check.c
-// Optimized for predominantly 7-bit content by Alex Hultman, 2016
-// Licensed as Zlib, like the rest of this project
 static bool isValidUtf8(unsigned char *s, size_t length)
 {
-    for (unsigned char *e = s + length; s != e; ) {
-        if (s + 4 <= e) {
-            uint32_t tmp;
-            memcpy(&tmp, s, 4);
-            if ((tmp & 0x80808080) == 0) {
-                s += 4;
-                continue;
-            }
-        }
-
-        while (!(*s & 0x80)) {
-            if (++s == e) {
-                return true;
-            }
-        }
-
-        if ((s[0] & 0x60) == 0x40) {
-            if (s + 1 >= e || (s[1] & 0xc0) != 0x80 || (s[0] & 0xfe) == 0xc0) {
-                return false;
-            }
-            s += 2;
-        } else if ((s[0] & 0xf0) == 0xe0) {
-            if (s + 2 >= e || (s[1] & 0xc0) != 0x80 || (s[2] & 0xc0) != 0x80 ||
-                    (s[0] == 0xe0 && (s[1] & 0xe0) == 0x80) || (s[0] == 0xed && (s[1] & 0xe0) == 0xa0)) {
-                return false;
-            }
-            s += 3;
-        } else if ((s[0] & 0xf8) == 0xf0) {
-            if (s + 3 >= e || (s[1] & 0xc0) != 0x80 || (s[2] & 0xc0) != 0x80 || (s[3] & 0xc0) != 0x80 ||
-                    (s[0] == 0xf0 && (s[1] & 0xf0) == 0x80) || (s[0] == 0xf4 && s[1] > 0x8f) || s[0] > 0xf4) {
-                return false;
-            }
-            s += 4;
-        } else {
-            return false;
-        }
-    }
-    return true;
+    return simdutf::validate_utf8(reinterpret_cast<const char *>(s), length);
 }
 
 struct CloseFrame {