allow indirect references in xref streams as an attempt to fix #457

src/UglyToad.PdfPig/Filters/DefaultFilterProvider.cs

@@ -1,11 +1,11 @@
 namespace UglyToad.PdfPig.Filters
 {
+    using Core;
     using System;
     using System.Collections.Generic;
     using System.Linq;
-    using Core;
     using Tokens;
-    using UglyToad.PdfPig.Util;
+    using Util;
 
     /// <inheritdoc />
     /// <summary>

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

@@ -269,7 +269,7 @@
                 return false;
             }
             
-            xrefTablePart = crossReferenceStreamParser.Parse(objByteOffset, fromTableAtOffset, objectStream);
+            xrefTablePart = crossReferenceStreamParser.Parse(objByteOffset, fromTableAtOffset, objectStream, pdfScanner);
 
             return true;
         }

src/UglyToad.PdfPig/Parser/Parts/CrossReference/CrossReferenceStreamParser.cs

@@ -4,6 +4,7 @@
     using Core;
     using Filters;
     using PdfPig.CrossReference;
+    using Tokenization.Scanner;
     using Tokens;
     using Util;
 
@@ -19,9 +20,9 @@
         /// <summary>
         /// Parses through the unfiltered stream and populates the xrefTable HashMap.
         /// </summary>
-        public CrossReferenceTablePart Parse(long streamOffset, long? fromTableAtOffset, StreamToken stream)
+        public CrossReferenceTablePart Parse(long streamOffset, long? fromTableAtOffset, StreamToken stream, IPdfTokenScanner pdfTokenScanner)
         {
-            var decoded = stream.Decode(filterProvider);
+            var decoded = stream.DecodeWithLookup(filterProvider, pdfTokenScanner);
 
             var fieldSizes = new CrossReferenceStreamFieldSize(stream.StreamDictionary);
 

src/UglyToad.PdfPig/PdfExtensions.cs

@@ -51,8 +51,12 @@
         /// Get the decoded data from this stream.
         /// </summary>
         public static IReadOnlyList<byte> Decode(this StreamToken stream, IFilterProvider filterProvider)
+            => DecodeWithLookup(stream, filterProvider, null);
+        internal static IReadOnlyList<byte> DecodeWithLookup(this StreamToken stream, IFilterProvider filterProvider, IPdfTokenScanner pdfTokenScanner)
         {
-            var filters = filterProvider.GetFilters(stream.StreamDictionary);
+            var filters = pdfTokenScanner != null
+                ? new FilterProviderWithLookup(filterProvider).GetFilters(stream.StreamDictionary, pdfTokenScanner)
+                : filterProvider.GetFilters(stream.StreamDictionary);
 
             var transform = stream.Data;
             for (var i = 0; i < filters.Count; i++)