fix bug #50661 (DOMDocument::loadXML does not allow UTF-16)

add test

NEWS

@@ -8,6 +8,7 @@ PHP                                                                        NEWS
   (Ilia)
 - Added stream_resolve_include_path(). (Mikko)
 
+- Fixed bug #50661 (DOMDocument::loadXML does not allow UTF-16). (Rob)
 - Fixed bug #50657 (copy() with an empty (zero-byte) HTTP source succeeds
   but returns false). (Ilia)
 - Fixed bug #50636 (MySQLi_Result sets values before calling constructor).

ext/dom/document.c

@@ -1542,7 +1542,7 @@ char *_dom_get_valid_file_path(char *source, char *resolved_path, int resolved_p
 }
 /* }}} */
 
-static xmlDocPtr dom_document_parser(zval *id, int mode, char *source, int options TSRMLS_DC) /* {{{ */
+static xmlDocPtr dom_document_parser(zval *id, int mode, char *source, int source_len, int options TSRMLS_DC) /* {{{ */
 {
     xmlDocPtr ret;
     xmlParserCtxtPtr ctxt = NULL;
@@ -1579,7 +1579,7 @@ static xmlDocPtr dom_document_parser(zval *id, int mode, char *source, int optio
 		}
 		
 	} else {
-		ctxt = xmlCreateDocParserCtxt(source);
+		ctxt = xmlCreateMemoryParserCtxt(source, source_len);
 	}
 
 	if (ctxt == NULL) {
@@ -1682,7 +1682,7 @@ static void dom_parse_document(INTERNAL_FUNCTION_PARAMETERS, int mode) {
 		RETURN_FALSE;
 	}
 
-	newdoc = dom_document_parser(id, mode, source, options TSRMLS_CC);
+	newdoc = dom_document_parser(id, mode, source, source_len, options TSRMLS_CC);
 
 	if (!newdoc)
 		RETURN_FALSE;

ext/dom/tests/bug50661.phpt

@@ -0,0 +1,16 @@
+--TEST--
+Bug #50661 (DOMDocument::loadXML does not allow UTF-16).
+--SKIPIF--
+<?php require_once('skipif.inc'); ?>
+--FILE--
+<?php
+$data = "\xFE\xFF\x00\x3C\x00\x66\x00\x6F\x00\x6F\x00\x2F\x00\x3E";
+
+$dom = new DOMDocument();
+$dom->loadXML($data);
+echo $dom->saveXML();
+
+?>
+--EXPECT--
+<?xml version="1.0"?>
+<foo/>