html: Don't stop on unsupported encoding

Continue to parse unlike in the XML case.

HTMLparser.c

@@ -3628,10 +3628,6 @@ htmlCharEncCheckAsciiCompatible(htmlParserCtxt *ctxt,
             XML_ENC_INPUT | XML_ENC_HTML,
             ctxt->convImpl, ctxt->convCtxt,
             &handler);
-    /*
-     * TODO: Unlike the XML parser, we shouldn't raise a fatal
-     * if the encoding is unsupported.
-     */
     if (res != XML_ERR_OK) {
         xmlFatalErr(ctxt, res, (const char *) encoding);
         return(-1);
@@ -3711,10 +3707,6 @@ htmlCheckMeta(htmlParserCtxtPtr ctxt, const xmlChar **atts) {
             return;
         }
 
-        /*
-         * TODO: Unlike the XML parser, we shouldn't raise a fatal
-         * if the encoding is unsupported.
-         */
         xmlSetDeclaredEncoding(ctxt, encoding);
     }
 }

parserInternals.c

@@ -468,14 +468,24 @@ void
 xmlFatalErr(xmlParserCtxt *ctxt, xmlParserErrors code, const char *info)
 {
     const char *errmsg;
+    xmlErrorDomain domain = XML_FROM_PARSER;
+    xmlErrorLevel level = XML_ERR_FATAL;
 
     errmsg = xmlErrString(code);
 
+    if ((ctxt != NULL) && (ctxt->html)) {
+        domain = XML_FROM_HTML;
+
+        /* Continue if encoding is unsupported */
+        if (code == XML_ERR_UNSUPPORTED_ENCODING)
+            level = XML_ERR_ERROR;
+    }
+
     if (info == NULL) {
-        xmlCtxtErr(ctxt, NULL, XML_FROM_PARSER, code, XML_ERR_FATAL,
+        xmlCtxtErr(ctxt, NULL, domain, code, level,
                    NULL, NULL, NULL, 0, "%s\n", errmsg);
     } else {
-        xmlCtxtErr(ctxt, NULL, XML_FROM_PARSER, code, XML_ERR_FATAL,
+        xmlCtxtErr(ctxt, NULL, domain, code, level,
                    (const xmlChar *) info, NULL, NULL, 0,
                    "%s: %s\n", errmsg, info);
     }