Merge pull request #7506 from Snuffleupagus/annotation-missing-subtype

Prevent errors when parsing Annotations with missing (or invalid) /Subtype entries (issue 7446)

src/core/annotation.js

@@ -74,13 +74,14 @@ AnnotationFactory.prototype = /** @lends AnnotationFactory.prototype */ {
 
     // Determine the annotation's subtype.
     var subtype = dict.get('Subtype');
-    subtype = isName(subtype) ? subtype.name : '';
+    subtype = isName(subtype) ? subtype.name : null;
 
     // Return the right annotation object based on the subtype and field type.
     var parameters = {
       xref: xref,
       dict: dict,
-      ref: ref
+      ref: ref,
+      subtype: subtype,
     };
 
     switch (subtype) {
@@ -116,8 +117,12 @@ AnnotationFactory.prototype = /** @lends AnnotationFactory.prototype */ {
         return new FileAttachmentAnnotation(parameters);
 
       default:
+        if (!subtype) {
+          warn('Annotation is missing the required /Subtype.');
+        } else {
           warn('Unimplemented annotation type "' + subtype + '", ' +
-             'falling back to base annotation');
+               'falling back to base annotation.');
+        }
         return new Annotation(parameters);
     }
   }
@@ -181,7 +186,7 @@ var Annotation = (function AnnotationClosure() {
     // Expose public properties using a data object.
     this.data = {};
     this.data.id = params.ref.toString();
-    this.data.subtype = dict.get('Subtype').name;
+    this.data.subtype = params.subtype;
     this.data.annotationFlags = this.flags;
     this.data.rect = this.rectangle;
     this.data.color = this.color;

test/pdfs/.gitignore

@@ -31,6 +31,7 @@
 !issue7403.pdf
 !issue7426.pdf
 !issue7439.pdf
+!issue7446.pdf
 !issue7492.pdf
 !filled-background.pdf
 !ArabicCIDTrueType.pdf

test/pdfs/issue7446.pdf

@@ -0,0 +1,51 @@
+%PDF-1.7
+%%μῦ
+
+1 0 obj
+<</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/Annots[6 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
+<</Length 68>>
+stream
+BT
+10 10 TD
+/F1 12 Tf
+(Renders even with a broken annotation) Tj
+ET
+
+endstream
+endobj
+
+6 0 obj
+<</Type/Annot/Rect[266 116 430 204]/Contents( This annotation is broken )>>
+endobj
+
+xref
+0 7
+0000000000 65536 f 
+0000000018 00000 n 
+0000000064 00000 n 
+0000000138 00000 n 
+0000000243 00000 n 
+0000000309 00000 n 
+0000000426 00000 n 
+
+trailer
+<</Size 7/Root 1 0 R>>
+
+startxref
+518
+%%EOF

test/test_manifest.json

@@ -1131,6 +1131,14 @@
        "link": false,
        "type": "eq"
     },
+    {  "id": "issue7446",
+       "file": "pdfs/issue7446.pdf",
+       "md5": "1b5bdd8a806e6ab9eda7c1c707b75fc6",
+       "rounds": 1,
+       "link": false,
+       "type": "load",
+       "about": "Annotation without the required /Subtype."
+    },
     {  "id": "issue7492-eq",
        "file": "pdfs/issue7492.pdf",
        "md5": "7b0b28919c1088a2a5a0aeedbaa4c3ca",

test/unit/annotation_layer_spec.js

@@ -26,11 +26,35 @@ describe('Annotation layer', function() {
     annotationFactory = null;
   });
 
+  describe('AnnotationFactory', function () {
+    it('should handle missing /Subtype', function () {
+      var annotationDict = new Dict();
+      annotationDict.set('Type', Name.get('Annot'));
+
+      var xrefMock = new XrefMock([annotationDict]);
+      var annotationRef = new Ref(1, 0);
+
+      var annotation = annotationFactory.create(xrefMock, annotationRef);
+      var data = annotation.data;
+      expect(data.annotationType).toBeUndefined();
+    });
+  });
+
   describe('Annotation', function() {
+    var dict, ref;
+
+    beforeAll(function (done) {
+      dict = new Dict();
+      ref = new Ref(1, 0);
+      done();
+    });
+
+    afterAll(function () {
+      dict = ref = null;
+    });
+
     it('should set and get flags', function() {
-      var dict = new Dict();
-      dict.set('Subtype', '');
-      var annotation = new Annotation({ dict: dict, ref: 0 });
+      var annotation = new Annotation({ dict: dict, ref: ref });
       annotation.setFlags(13);
 
       expect(annotation.hasFlag(AnnotationFlag.INVISIBLE)).toEqual(true);
@@ -40,81 +64,63 @@ describe('Annotation layer', function() {
     });
 
     it('should be viewable and not printable by default', function() {
-      var dict = new Dict();
-      dict.set('Subtype', '');
-      var annotation = new Annotation({ dict: dict, ref: 0 });
+      var annotation = new Annotation({ dict: dict, ref: ref });
 
       expect(annotation.viewable).toEqual(true);
       expect(annotation.printable).toEqual(false);
     });
 
     it('should set and get a valid rectangle', function() {
-      var dict = new Dict();
-      dict.set('Subtype', '');
-      var annotation = new Annotation({ dict: dict, ref: 0 });
+      var annotation = new Annotation({ dict: dict, ref: ref });
       annotation.setRectangle([117, 694, 164.298, 720]);
 
       expect(annotation.rectangle).toEqual([117, 694, 164.298, 720]);
     });
 
     it('should not set and get an invalid rectangle', function() {
-      var dict = new Dict();
-      dict.set('Subtype', '');
-      var annotation = new Annotation({ dict: dict, ref: 0 });
+      var annotation = new Annotation({ dict: dict, ref: ref });
       annotation.setRectangle([117, 694, 164.298]);
 
       expect(annotation.rectangle).toEqual([0, 0, 0, 0]);
     });
 
     it('should reject a color if it is not an array', function() {
-      var dict = new Dict();
-      dict.set('Subtype', '');
-      var annotation = new Annotation({ dict: dict, ref: 0 });
+      var annotation = new Annotation({ dict: dict, ref: ref });
       annotation.setColor('red');
 
       expect(annotation.color).toEqual(new Uint8Array([0, 0, 0]));
     });
 
     it('should set and get a transparent color', function() {
-      var dict = new Dict();
-      dict.set('Subtype', '');
-      var annotation = new Annotation({ dict: dict, ref: 0 });
+      var annotation = new Annotation({ dict: dict, ref: ref });
       annotation.setColor([]);
 
       expect(annotation.color).toEqual(null);
     });
 
     it('should set and get a grayscale color', function() {
-      var dict = new Dict();
-      dict.set('Subtype', '');
-      var annotation = new Annotation({ dict: dict, ref: 0 });
+      var annotation = new Annotation({ dict: dict, ref: ref });
       annotation.setColor([0.4]);
 
       expect(annotation.color).toEqual(new Uint8Array([102, 102, 102]));
     });
 
     it('should set and get an RGB color', function() {
-      var dict = new Dict();
-      dict.set('Subtype', '');
-      var annotation = new Annotation({ dict: dict, ref: 0 });
+      var annotation = new Annotation({ dict: dict, ref: ref });
       annotation.setColor([0, 0, 1]);
 
       expect(annotation.color).toEqual(new Uint8Array([0, 0, 255]));
     });
 
     it('should set and get a CMYK color', function() {
-      var dict = new Dict();
-      dict.set('Subtype', '');
-      var annotation = new Annotation({ dict: dict, ref: 0 });
+      var annotation = new Annotation({ dict: dict, ref: ref });
       annotation.setColor([0.1, 0.92, 0.84, 0.02]);
 
       expect(annotation.color).toEqual(new Uint8Array([233, 59, 47]));
     });
 
     it('should not set and get an invalid color', function() {
-      var dict = new Dict();
-      dict.set('Subtype', '');
-      var annotation = new Annotation({ dict: dict, ref: 0 });
+      var annotation = new Annotation({ dict: dict, ref: ref });
       annotation.setColor([0.4, 0.6]);
 
       expect(annotation.color).toEqual(new Uint8Array([0, 0, 0]));