@@ -22,6 +22,7 @@

 #include "libavutil/common.h"

 #include "libavutil/parseutils.h"

 #include "htmlsubtitles.h"

+#include <ctype.h>

 static int html_color_parse(void *log_ctx, const char *str)

 {

@@ -52,6 +53,25 @@ static void rstrip_spaces_buf(AVBPrint *buf)

 }

 /*

+ * Fast code for scanning text enclosed in braces. Functionally

+ * equivalent to this sscanf call:

+ *

+ * sscanf(in, "{\\an%*1u}%n", &len) >= 0 && len > 0

+ */

+static int scanbraces(const char* in) {

+    if (strncmp(in, "{\\an", 4) != 0) {

+        return 0;

+    }

+    if (!isdigit(in[4])) {

+        return 0;

+    }

+    if (in[5] != '}') {

+        return 0;

+    }

+    return 1;

+}

+

+/*

  * Fast code for scanning the rest of a tag. Functionally equivalent to

  * this sscanf call:

  *

@@ -110,9 +130,7 @@ int ff_htmlmarkup_to_ass(void *log_ctx, AVBPrint *dst, const char *in)

             break;

         case '{':    /* skip all {\xxx} substrings except for {\an%d}

                         and all microdvd like styles such as {Y:xxx} */

-            len = 0;

-            an += sscanf(in, "{\\an%*1u}%n", &len) >= 0 && len > 0;

-

+            an += scanbraces(in);

             if (!closing_brace_missing) {

                 if (   (an != 1 && in[1] == '\\')

                     || (in[1] && strchr("CcFfoPSsYy", in[1]) && in[2] == ':')) {