add a test for #208

src/UglyToad.PdfPig.Tests/Fonts/Parser/EncodingReaderTests.cs

@@ -0,0 +1,56 @@
+namespace UglyToad.PdfPig.Tests.Fonts.Parser
+{
+    using System.Text.RegularExpressions;
+    using PdfFonts.Parser;
+    using PdfPig.Core;
+    using PdfPig.Encryption;
+    using PdfPig.Tokenization.Scanner;
+    using PdfPig.Tokens;
+    using Xunit;
+
+    public class EncodingReaderTests
+    {
+        [Fact]
+        public void GetWinAnsiFromNameObject()
+        {
+            const string input = @"
+1 0 obj
+<< /Type /Font /Encoding 12 0 R /Name /WindowsFont1>>
+endobj
+
+12 0 obj
+/WinAnsiEncoding
+endobj";
+
+            var scanner = GetScanner(input);
+
+            var reader = new EncodingReader(scanner);
+
+            var fontDictionary = scanner.Get(new IndirectReference(1, 0));
+
+            var encoding = reader.Read(fontDictionary.Data as DictionaryToken);
+
+            Assert.NotNull(encoding);
+        }
+
+        private static PdfTokenScanner GetScanner(string s)
+        {
+            var input = StringBytesTestConverter.Convert(s, false);
+
+            var locationProvider = new TestObjectLocationProvider();
+
+            var regex = new Regex(@"\n(\d+)\s(\d+)\sobj");
+
+            foreach (Match match in regex.Matches(s))
+            {
+                var objN = match.Groups[1].Value;
+                var gen = match.Groups[2].Value;
+
+                locationProvider.Offsets[new IndirectReference(int.Parse(objN), int.Parse(gen))] = match.Index + 1;
+            }
+            
+            return new PdfTokenScanner(input.Bytes, locationProvider,
+                new TestFilterProvider(), NoOpEncryptionHandler.Instance);
+        }
+    }
+}

src/UglyToad.PdfPig/PdfFonts/Parser/EncodingReader.cs

@@ -2,6 +2,7 @@
 {
     using System;
     using System.Collections.Generic;
+    using Core;
     using Fonts;
     using Fonts.Encodings;
     using PdfPig.Parser.Parts;
@@ -47,13 +48,22 @@
 
                     return WinAnsiEncoding.Instance;
                 }
+
+                throw new InvalidOperationException($"Did not recognize named font: {name} in {fontDictionary}.");
             }
 
-            DictionaryToken encodingDictionary = DirectObjectFinder.Get<DictionaryToken>(baseEncodingObject, pdfScanner);
+            try
+            {
+                DictionaryToken encodingDictionary = DirectObjectFinder.Get<DictionaryToken>(baseEncodingObject, pdfScanner);
 
-            var encoding = ReadEncodingDictionary(encodingDictionary, fontEncoding);
+                var encoding = ReadEncodingDictionary(encodingDictionary, fontEncoding);
 
-            return encoding;
+                return encoding;
+            }
+            catch (Exception ex)
+            {
+                throw new PdfDocumentFormatException($"Failed to locate encoding in {fontDictionary}.", ex);
+            }
         }
 
         private Encoding ReadEncodingDictionary(DictionaryToken encodingDictionary, Encoding fontEncoding)