Strip NULL characters, according to new spec

lib/parser_block.js

@@ -89,6 +89,7 @@ ParserBlock.prototype.tokenize = function (state, startLine, endLine) {
 var TABS_SCAN_RE = /[\n\t]/g;
 var NEWLINES_RE  = /\r[\n\u0085]|[\u2424\u2028\u0085]/g;
 var SPACES_RE    = /\u00a0/g;
+var NULL_RE      = /\u0000/g;
 
 ParserBlock.prototype.parse = function (src, options, env, outTokens) {
   var state, lineStart = 0, lastTabPos = 0;
@@ -101,6 +102,9 @@ ParserBlock.prototype.parse = function (src, options, env, outTokens) {
   // Normalize newlines
   src = src.replace(NEWLINES_RE, '\n');
 
+  // Strin NULL characters
+  src = src.replace(NULL_RE, '');
+
   // Replace tabs with proper number of spaces (1..4)
   if (src.indexOf('\t') >= 0) {
     src = src.replace(TABS_SCAN_RE, function (match, offset) {

test/misc.js

@@ -164,6 +164,12 @@ describe('API', function () {
 
 describe('Misc', function () {
 
+  it('Should strip (or replace) NULL characters', function () {
+    var md = markdownit();
+
+    assert.strictEqual(md.render('foo\u0000bar'), '<p>foobar</p>\n');
+  });
+
   it('Should correctly parse strings without tailing \\n', function () {
     var md = markdownit();