Stops objects indexing at the end

Author: yurydelendik

.gitattributes

@@ -0,0 +1 @@
+*.pdf -crlf

src/core/obj.js

@@ -758,6 +758,9 @@ var XRef = (function XRefClosure() {
         if (ch === 37) { // %-comment
           do {
             ++position;
+            if (position >= length) {
+              break;
+            }
             ch = buffer[position];
           } while (ch !== 13 && ch !== 10);
           continue;

test/pdfs/.gitignore

@@ -36,6 +36,7 @@
 !type4psfunc.pdf
 !issue1350.pdf
 !S2.pdf
+!helloworld-bad.pdf
 !zerowidthline.pdf
 !issue1002.pdf
 !issue925.pdf

test/pdfs/helloworld-bad.pdf

@@ -897,6 +897,12 @@
       "link": true,
       "type": "eq"
     },
+    {  "id": "helloworld-bad",
+      "file": "pdfs/helloworld-bad.pdf",
+      "md5": "bf5ab1cf7fe3a502c3754f55e6ceeabd",
+      "rounds": 1,
+      "type": "load"
+    },
     {  "id": "issue818",
       "file": "pdfs/issue818.pdf",
       "md5": "dd2f8a5bd65164ad74da2b45a6ca90cc",