Update test Issue874: No longer missing a font

Including the stream-xref means that the formerly missing font is no longer missing, so simply run the two test-cases under the (stricter) assumption of SkipMissingFonts=false.

src/UglyToad.PdfPig.Tests/Integration/GithubIssuesTests.cs

@@ -472,19 +472,13 @@
         {
             var doc = IntegrationHelpers.GetDocumentPath("ErcotFacts.pdf");
 
-            using (var document = PdfDocument.Open(doc, new ParsingOptions() { UseLenientParsing = true, SkipMissingFonts = true }))
-            {
-                var page1 = document.GetPage(1);
-                Assert.Equal(1788, page1.Letters.Count);
-
-                var page2 = document.GetPage(2);
-                Assert.Equal(2430, page2.Letters.Count);
-            }
-
             using (var document = PdfDocument.Open(doc, new ParsingOptions() { UseLenientParsing = true, SkipMissingFonts = false }))
             {
-                var ex = Assert.Throws<ArgumentNullException>(() => document.GetPage(1));
-                Assert.StartsWith("Value cannot be null.", ex.Message);
+                var page1 = document.GetPage(1);
+                Assert.Equal(1939, page1.Letters.Count);
+
+                var page2 = document.GetPage(2);
+                Assert.Equal(2434, page2.Letters.Count);
             }
         }
 

src/UglyToad.PdfPig/CrossReference/CrossReferenceTableBuilder.cs

@@ -56,16 +56,16 @@
                 // add this and follow chain defined by 'Prev' keys
                 xrefPartToBytePositionOrder.Add(firstCrossReferenceOffset);
 
-                // Get any streams that are tied to this table.
-                var activePart = currentPart;
-                var dependents = parts.Where(x => x.TiedToXrefAtOffset == activePart.Offset);
-                foreach (var dependent in dependents)
-                {
-                    xrefPartToBytePositionOrder.Add(dependent.Offset);
-                }
-
                 while (currentPart.Dictionary != null)
                 {
+                    // Get any streams that are tied to this table.
+                    var activePart = currentPart;
+                    var dependents = parts.Where(x => x.TiedToXrefAtOffset == activePart.Offset);
+                    foreach (var dependent in dependents)
+                    {
+                        xrefPartToBytePositionOrder.Add(dependent.Offset);
+                    }
+
                     long prevBytePos = currentPart.GetPreviousOffset();
                     if (prevBytePos == -1)
                     {

src/UglyToad.PdfPig/Parser/FileStructure/FirstPassParser.cs

@@ -153,6 +153,23 @@ internal static partial class FirstPassParser
             {
                 results.Add(table);
                 nextLocation = table.GetPrevious();
+
+                // Also add any optional associated Stream
+                var xRefStm = table.GetXRefStm();
+                if (xRefStm is long xRefStmValue)
+                {
+                    var stream = GetXrefStreamOrTable(
+                        offset,
+                        input,
+                        scanner,
+                        xRefStmValue,
+                        log);
+
+                    if (stream != null)
+                    {
+                        results.Add(stream);
+                    }
+                }
             }
             else if (streamOrTable is XrefStream stream)
             {

src/UglyToad.PdfPig/Parser/FileStructure/XrefTable.cs

@@ -44,4 +44,14 @@ internal sealed class XrefTable : IXrefSection
 
         return null;
     }
+
+    public long? GetXRefStm()
+    {
+        if (Dictionary != null && Dictionary.TryGet(NameToken.XrefStm, out NumericToken xRefStm))
+        {
+            return xRefStm.Long;
+        }
+
+        return null;
+    }
 }