Stops objects indexing at the end

.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

@@ -0,0 +1,68 @@
+%PDF-1.7
+
+1 0 obj  % entry point
+<<
+  /Type /Catalog
+  /Pages 2 0 R
+>>
+endobj
+
+2 0 obj
+<<
+  /Type /Pages
+  /MediaBox [ 0 0 200 200 ]
+  /Count 1
+  /Kids [ 3 0 R ]
+>>
+endobj
+
+3 0 obj
+<<
+  /Type /Page
+  /Parent 2 0 R
+  /Resources <<
+    /Font <<
+      /F1 4 0 R 
+    >>
+  >>
+  /Contents 5 0 R
+>>
+endobj
+
+4 0 obj
+<<
+  /Type /Font
+  /Subtype /Type1
+  /BaseFont /Times-Roman
+>>
+endobj
+
+5 0 obj  % page content
+<<
+  /Length 44
+>>
+stream
+BT
+70 50 TD
+/F1 12 Tf
+(Hello, world!) Tj
+ET
+endstream
+endobj
+
+xref
+0 6
+0000000000 65535 f 
+0000000010 00000 n 
+0000000079 00000 n 
+0000000173 00000 n 
+0000000301 00000 n 
+0000000380 00000 n 
+trailer
+<<
+  /Size 6
+  /Root 1 0 R
+>>
+startxref
+492
+%%EOF

test/test_manifest.json

@@ -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",