Implement NullStream, fix #1832

src/parser.js

@@ -230,6 +230,9 @@ var Parser = (function ParserClosure() {
       return stream;
     },
     makeFilter: function Parser_makeFilter(stream, name, length, params) {
+      if (stream.dict.get('Length') === 0) {
+        return new NullStream(stream);
+      }
       if (name == 'FlateDecode' || name == 'Fl') {
         if (params) {
           return new PredictorStream(new FlateStream(stream), params);

src/stream.js

@@ -2350,3 +2350,12 @@ var LZWStream = (function LZWStreamClosure() {
   return LZWStream;
 })();
 
+var NullStream = (function NullStreamClosure() {
+  function NullStream() {
+    Stream.call(this, new Uint8Array(0));
+  }
+
+  NullStream.prototype = Stream.prototype;
+
+  return NullStream;
+})();