ffprobe: switch to av_bprint_escape for XML escaping

Additionally update the result of the ffprobe XML writing test.

Signed-off-by: Jan Ekström <jan.ekstrom@24i.com>

fftools/ffprobe.c

@@ -1672,24 +1672,6 @@ static av_cold int xml_init(WriterContext *wctx)
     return 0;
 }
 
-static const char *xml_escape_str(AVBPrint *dst, const char *src, void *log_ctx)
-{
-    const char *p;
-
-    for (p = src; *p; p++) {
-        switch (*p) {
-        case '&' : av_bprintf(dst, "%s", "&");  break;
-        case '<' : av_bprintf(dst, "%s", "&lt;");   break;
-        case '>' : av_bprintf(dst, "%s", "&gt;");   break;
-        case '"' : av_bprintf(dst, "%s", "&quot;"); break;
-        case '\'': av_bprintf(dst, "%s", "&apos;"); break;
-        default: av_bprint_chars(dst, *p, 1);
-        }
-    }
-
-    return dst->str;
-}
-
 #define XML_INDENT() printf("%*c", xml->indent_level * 4, ' ')
 
 static void xml_print_section_header(WriterContext *wctx)
@@ -1761,14 +1743,22 @@ static void xml_print_str(WriterContext *wctx, const char *key, const char *valu
 
     if (section->flags & SECTION_FLAG_HAS_VARIABLE_FIELDS) {
         XML_INDENT();
+        av_bprint_escape(&buf, key, NULL,
+                         AV_ESCAPE_MODE_XML, AV_ESCAPE_FLAG_XML_DOUBLE_QUOTES);
         printf("<%s key=\"%s\"",
-               section->element_name, xml_escape_str(&buf, key, wctx));
+               section->element_name, buf.str);
         av_bprint_clear(&buf);
-        printf(" value=\"%s\"/>\n", xml_escape_str(&buf, value, wctx));
+
+        av_bprint_escape(&buf, value, NULL,
+                         AV_ESCAPE_MODE_XML, AV_ESCAPE_FLAG_XML_DOUBLE_QUOTES);
+        printf(" value=\"%s\"/>\n", buf.str);
     } else {
         if (wctx->nb_item[wctx->level])
             printf(" ");
-        printf("%s=\"%s\"", key, xml_escape_str(&buf, value, wctx));
+
+        av_bprint_escape(&buf, value, NULL,
+                         AV_ESCAPE_MODE_XML, AV_ESCAPE_FLAG_XML_DOUBLE_QUOTES);
+        printf("%s=\"%s\"", key, buf.str);
     }
 
     av_bprint_finalize(&buf, NULL);

tests/ref/fate/ffprobe_xml

@@ -51,7 +51,7 @@
 
     <format filename="tests/data/ffprobe-test.nut" nb_streams="3" nb_programs="0" format_name="nut" start_time="0.000000" duration="0.120000" size="1053624" bit_rate="70241600" probe_score="100">
         <tag key="title" value="ffprobe test file"/>
-        <tag key="comment" value="&apos;A comment with CSV, XML &amp; JSON special chars&apos;: &lt;tag value=&quot;x&quot;&gt;"/>
+        <tag key="comment" value="'A comment with CSV, XML &amp; JSON special chars': &lt;tag value=&quot;x&quot;&gt;"/>
         <tag key="comment2" value="I ♥ Üñîçød€"/>
     </format>
 </ffprobe>