Revert "Do not URI escape in server side includes"

This reverts commit 960f0e2.

This commit introduced

- an infinite loop, found by OSS-Fuzz, which could be easily fixed.
- an algorithm with quadratic runtime
- a security issue, see
  https://bugzilla.gnome.org/show_bug.cgi?id=769760

A better approach is to add an option not to escape URLs at all
which libxml2 should have possibly done in the first place.

HTMLtree.c

@@ -706,49 +706,22 @@ htmlAttrDumpOutput(xmlOutputBufferPtr buf, xmlDocPtr doc, xmlAttrPtr cur,
 		 (!xmlStrcasecmp(cur->name, BAD_CAST "src")) ||
 		 ((!xmlStrcasecmp(cur->name, BAD_CAST "name")) &&
 		  (!xmlStrcasecmp(cur->parent->name, BAD_CAST "a"))))) {
+		xmlChar *escaped;
 		xmlChar *tmp = value;
-		/* xmlURIEscapeStr() escapes '"' so it can be safely used. */
-		xmlBufCCat(buf->buffer, "\"");
 
 		while (IS_BLANK_CH(*tmp)) tmp++;
 
-		/* URI Escape everything, except server side includes. */
-		for ( ; ; ) {
-		    xmlChar *escaped;
-		    xmlChar endChar;
-		    xmlChar *end = NULL;
-		    xmlChar *start = (xmlChar *)xmlStrstr(tmp, BAD_CAST "<!--");
-		    if (start != NULL) {
-			end = (xmlChar *)xmlStrstr(tmp, BAD_CAST "-->");
-			if (end != NULL) {
-			    *start = '\0';
-			}
-		    }
-
-		    /* Escape the whole string, or until start (set to '\0'). */
-		    escaped = xmlURIEscapeStr(tmp, BAD_CAST"@/:=?;#%&,+");
-		    if (escaped != NULL) {
-		        xmlBufCat(buf->buffer, escaped);
-		        xmlFree(escaped);
-		    } else {
-		        xmlBufCat(buf->buffer, tmp);
-		    }
-
-		    if (end == NULL) { /* Everything has been written. */
-			break;
-		    }
-
-		    /* Do not escape anything within server side includes. */
-		    *start = '<'; /* Restore the first character of "<!--". */
-		    end += 3; /* strlen("-->") */
-		    endChar = *end;
-		    *end = '\0';
-		    xmlBufCat(buf->buffer, start);
-		    *end = endChar;
-		    tmp = end;
+		/*
+		 * the < and > have already been escaped at the entity level
+		 * And doing so here breaks server side includes
+		 */
+		escaped = xmlURIEscapeStr(tmp, BAD_CAST"@/:=?;#%&,+<>");
+		if (escaped != NULL) {
+		    xmlBufWriteQuotedString(buf->buffer, escaped);
+		    xmlFree(escaped);
+		} else {
+		    xmlBufWriteQuotedString(buf->buffer, value);
 		}
-
-		xmlBufCCat(buf->buffer, "\"");
 	    } else {
 		xmlBufWriteQuotedString(buf->buffer, value);
 	    }