From 9b7554c973c64227c9f145564a63715a285ea4db Mon Sep 17 00:00:00 2001
From: Eliot Jones <elioty@hotmail.co.uk>
Date: Thu, 27 Aug 2020 09:06:14 +0100
Subject: [PATCH] #203 enable utf16 be strings to be written to the document
 builder

---
 .../Writer/PdfDocumentBuilderTests.cs         | 18 +++++++++++++++
 src/UglyToad.PdfPig/Writer/TokenWriter.cs     | 22 ++++++++++++++++++-
 2 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/src/UglyToad.PdfPig.Tests/Writer/PdfDocumentBuilderTests.cs b/src/UglyToad.PdfPig.Tests/Writer/PdfDocumentBuilderTests.cs
index 87125b32..8dc9cb89 100644
--- a/src/UglyToad.PdfPig.Tests/Writer/PdfDocumentBuilderTests.cs
+++ b/src/UglyToad.PdfPig.Tests/Writer/PdfDocumentBuilderTests.cs
@@ -570,6 +570,24 @@
             }
         }
 
+        [Fact]
+        public void CanCreateDocumentInformationDictionaryWithNonAsciiCharacters()
+        {
+            const string littlePig = "маленький поросенок";
+            var builder = new PdfDocumentBuilder();
+            builder.DocumentInformation.Title = littlePig;
+            var page = builder.AddPage(PageSize.A4);
+            var font = builder.AddTrueTypeFont(TrueTypeTestHelper.GetFileBytes("Roboto-Regular.ttf"));
+            page.AddText(littlePig, 12, new PdfPoint(120, 600), font);
+
+            var file = builder.Build();
+            WriteFile(nameof(CanCreateDocumentInformationDictionaryWithNonAsciiCharacters), file);
+            using (var document = PdfDocument.Open(file))
+            {
+                Assert.Equal(littlePig, document.Information.Title);
+            }
+        }
+
         private static void WriteFile(string name, byte[] bytes, string extension = "pdf")
         {
             try
diff --git a/src/UglyToad.PdfPig/Writer/TokenWriter.cs b/src/UglyToad.PdfPig/Writer/TokenWriter.cs
index 458905c1..89f95944 100644
--- a/src/UglyToad.PdfPig/Writer/TokenWriter.cs
+++ b/src/UglyToad.PdfPig/Writer/TokenWriter.cs
@@ -368,8 +368,28 @@
 
         private static void WriteString(StringToken stringToken, Stream outputStream)
         {
+            if (stringToken.EncodedWith == StringToken.Encoding.Iso88591)
+            {
+                var isUtf16 = false;
+                for (var i = 0; i < stringToken.Data.Length; i++)
+                {
+                    var c = stringToken.Data[i];
+                    // Close enough.
+                    if (c > 250)
+                    {
+                        isUtf16 = true;
+                        break;
+                    }
+                }
+
+                if (isUtf16)
+                {
+                    stringToken = new StringToken(stringToken.Data, StringToken.Encoding.Utf16BE);
+                }
+            }
+
             outputStream.WriteByte(StringStart);
-            var bytes = OtherEncodings.StringAsLatin1Bytes(stringToken.Data);
+            var bytes = stringToken.GetBytes();
             outputStream.Write(bytes, 0, bytes.Length);
             outputStream.WriteByte(StringEnd);