Move some stuff out of LuaStack

luprex/cpp/core/util.cpp

@@ -850,6 +850,18 @@ static std::string_view read_number_x(const char *p, bool plus, bool minus, bool
     return sv::read_number(source, plus, minus, dec, exp);
 }
 
+eng::string util::decode_token(uint64_t value) {
+    static const char encoding[] =
+        "\0_0123456789abcdefghijklmnopqrstuvwxyz";
+    uint64_t n = value;
+    char buffer[13] = {};
+    for (int i = 11; i >= 0; i--) {
+        buffer[i] = encoding[n % 38];
+        n /= 38;
+    }
+    return eng::string(buffer);
+}
+
 LuaDefine(unittests_util, "", "some unit tests") {
     // Test valid_hostname
     LuaAssert(L, sv::valid_hostname("foo123"));