Add DisplayNameUtf8 and DirectoryNameUtf8

#47

Author: Krusen

BencodeNET.Tests/Torrents/TorrentTests.cs

@@ -92,6 +92,49 @@ public void DisplayName_UnknownFileMode_ThrowsBencodeException()
             act.Should().Throw<BencodeException>();
         }
 
+        [Theory]
+        [AutoMockedData]
+        public void DisplayNameUtf8_SingleFile_IsFileName(string fileName)
+        {
+            var torrent = new Torrent
+            {
+                File = new SingleFileInfo
+                {
+                    FileNameUtf8 = fileName
+                }
+            };
+
+            torrent.FileMode.Should().Be(TorrentFileMode.Single);
+            torrent.DisplayNameUtf8.Should().Be(fileName);
+        }
+
+        [Theory]
+        [AutoMockedData]
+        public void DisplayNameUtf8_MultiFile_IsDirectoryName(string directoryNameUtf8)
+        {
+            var torrent = new Torrent
+            {
+                Files = new MultiFileInfoList(default, directoryNameUtf8)
+                {
+                    new MultiFileInfo()
+                }
+            };
+
+            torrent.FileMode.Should().Be(TorrentFileMode.Multi);
+            torrent.DisplayNameUtf8.Should().Be(directoryNameUtf8);
+        }
+
+        [Fact]
+        public void DisplayNameUtf8_UnknownFileMode_ThrowsBencodeException()
+        {
+            var torrent = new Torrent();
+
+            Func<string> act = () => torrent.DisplayNameUtf8;
+
+            torrent.FileMode.Should().Be(TorrentFileMode.Unknown);
+            act.Should().Throw<BencodeException>();
+        }
+
         [Fact]
         public void PiecesAsHexString_Get_ReturnsHexUppercaseWithoutDashes()
         {

BencodeNET/Torrents/MultiFileInfoList.cs

@@ -21,12 +21,29 @@ public MultiFileInfoList(string directoryName)
             DirectoryName = directoryName;
         }
 
+        /// <summary></summary>
+        /// <param name="directoryName">Name of directory to store files in.</param>
+        /// <param name="directoryNameUtf8">Name of directory to store files in.</param>
+        public MultiFileInfoList(string directoryName, string directoryNameUtf8)
+        {
+            DirectoryName = directoryName;
+            DirectoryNameUtf8 = directoryNameUtf8;
+        }
+
         /// <summary>
         /// The name of the directory in which to store all the files. This is purely advisory.
         /// </summary>
         /// <remarks>
         /// Corresponds to the 'name' field.
         /// </remarks>
         public string DirectoryName { get; set; }
+
+        /// <summary>
+        /// The UTF-8 encoded name of the directory in which to store all the files. This is purely advisory.
+        /// </summary>
+        /// <remarks>
+        /// Corresponds to the 'name.utf-8' field.
+        /// </remarks>
+        public string DirectoryNameUtf8 { get; set; }
     }
 }

BencodeNET/Torrents/Torrent.cs

@@ -133,6 +133,20 @@ public virtual string DisplayName
             }
         }
 
+        public virtual string DisplayNameUtf8
+        {
+            get
+            {
+                if (FileMode == TorrentFileMode.Single)
+                    return File.FileNameUtf8;
+
+                if (FileMode == TorrentFileMode.Multi)
+                    return Files.DirectoryNameUtf8;
+
+                throw new BencodeException("Cannot get torrent display name. Unknown torrent file mode.");
+            }
+        }
+
         /// <summary>
         /// [optional] The creation date of the torrent.
         /// </summary>

BencodeNET/Torrents/TorrentParser.cs

@@ -237,6 +237,7 @@ protected virtual MultiFileInfoList ParseMultiFileInfo(BDictionary info, Encodin
             var list = new MultiFileInfoList
             {
                 DirectoryName = info.Get<BString>(TorrentInfoFields.Name).ToString(encoding),
+                DirectoryNameUtf8 = info.Get<BString>(TorrentInfoFields.NameUtf8).ToString(encoding)
             };
 
             var fileInfos = info.Get<BList>(TorrentInfoFields.Files).Cast<BDictionary>()