1 files changed, 10 insertions, 2 deletions
diff --git a/dotnet/Mammoth/Couscous/mammoth/internal/util/Base64Encoding.cs b/dotnet/Mammoth/Couscous/mammoth/internal/util/Base64Encoding.cs
index f8270b0..24d2f9c 100644
--- a/dotnet/Mammoth/Couscous/mammoth/internal/util/Base64Encoding.cs
+++ b/dotnet/Mammoth/Couscous/mammoth/internal/util/Base64Encoding.cs
@@ -3,8 +3,16 @@ using Mammoth.Couscous.java.io;
 
 namespace Mammoth.Couscous.org.zwobble.mammoth.@internal.util {
     internal static class Base64Encoding {
-        internal static string streamToBase64(SupplierWithException<InputStream, IOException> stream) {
-            throw new UnsupportedOperationException();
+        internal static string streamToBase64(SupplierWithException<InputStream, IOException> streamSupplier) {
+            using (var stream = streamSupplier.get().Stream) {
+                return streamToBase64(stream);
+            }
+        }
+        
+        internal static string streamToBase64(System.IO.Stream stream) {
+            var memoryStream = new System.IO.MemoryStream();
+            stream.CopyTo(memoryStream);
+            return System.Convert.ToBase64String(memoryStream.ToArray());
         }
     }
 }