Bug fixes of reading and writing (UCS2 and EncodedString)

src/ImageSharp/ImageSharp.csproj

@@ -49,6 +49,7 @@
 
   <ItemGroup>
     <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="5.0.0" />
+    <PackageReference Include="System.Text.Encoding.CodePages" Version="5.0.0" />
   </ItemGroup>
 
   <ItemGroup Condition=" $(TargetFramework.StartsWith('netstandard')) OR '$(TargetFramework)' == 'net472'">

src/ImageSharp/Metadata/Profiles/Exif/ExifEncodedStringHelpers.cs

@@ -12,9 +12,9 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
     {
         public const int CharacterCodeBytesLength = 8;
 
-        private const ulong AsciiCode = 0x_41_53_43_49_49_00_00_00;
+        private const ulong AsciiCode = 0x_00_00_00_49_49_43_53_41;
-        private const ulong JISCode = 0x_4A_49_53_00_00_00_00_00;
+        private const ulong JISCode = 0x_00_00_00_00_00_53_49_4A;
-        private const ulong UnicodeCode = 0x_55_4E_49_43_4F_44_45_00;
+        private const ulong UnicodeCode = 0x_45_44_4F_43_49_4E_55;
         private const ulong UndefinedCode = 0x_00_00_00_00_00_00_00_00;
 
         private static ReadOnlySpan<byte> AsciiCodeBytes => new byte[] { 0x41, 0x53, 0x43, 0x49, 0x49, 0, 0, 0 };
@@ -25,7 +25,13 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
 
         private static ReadOnlySpan<byte> UndefinedCodeBytes => new byte[] { 0, 0, 0, 0, 0, 0, 0, 0 };
 
-        private static Encoding JIS0208Encoding => Encoding.GetEncoding(932);
+        private static Encoding JIS0208Encoding => CodePagesEncodingProvider.Instance.GetEncoding(932);
+
+        public static bool IsEncodedString(ExifTagValue tag) => tag switch
+        {
+            ExifTagValue.UserComment or ExifTagValue.GPSProcessingMethod or ExifTagValue.GPSAreaInformation => true,
+            _ => false
+        };
 
         public static ReadOnlySpan<byte> GetCodeBytes(CharacterCode code) => code switch
         {
@@ -45,7 +51,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
             _ => Encoding.UTF8
         };
 
-        public static bool TryCreate(ReadOnlySpan<byte> buffer, out EncodedString encodedString)
+        public static bool TryParse(ReadOnlySpan<byte> buffer, out EncodedString encodedString)
         {
             if (TryDetect(buffer, out CharacterCode code))
             {
@@ -61,17 +67,17 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
         public static uint GetDataLength(EncodedString encodedString) =>
             (uint)GetEncoding(encodedString.Code).GetByteCount(encodedString.Text) + CharacterCodeBytesLength;
 
-        public static bool IsEncodedString(ExifTagValue tag)
+        public static byte[] GetData(EncodedString encodedString)
         {
-            switch (tag)
+            int length = (int)GetDataLength(encodedString);
-            {
+            byte[] buffer = new byte[length];
-                case ExifTagValue.UserComment:
+
-                case ExifTagValue.GPSProcessingMethod:
+            GetCodeBytes(encodedString.Code).CopyTo(buffer);
-                case ExifTagValue.GPSAreaInformation:
+
-                    return true;
+            string text = encodedString.Text;
-                default:
+            GetEncoding(encodedString.Code).GetBytes(text, 0, text.Length, buffer, CharacterCodeBytesLength);
-                    return false;
+
-            }
+            return buffer;
         }
 
         private static bool TryDetect(ReadOnlySpan<byte> buffer, out CharacterCode code)

src/ImageSharp/Metadata/Profiles/Exif/ExifReader.cs

@@ -220,10 +220,6 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
             if (this.TryReadSpan(buffer))
             {
                 object value = this.ConvertValue(tag.Exif, tag.DataType, buffer, tag.NumberOfComponents > 1 || tag.Exif.IsArray);
-                if (value is EncodedString)
-                {
-                    // Console.WriteLine("EncodedString tag: " + (ushort)tag.Exif.Tag);
-                }
 
                 this.Add(values, tag.Exif, value);
             }
@@ -248,7 +244,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
 
         private byte ConvertToByte(ReadOnlySpan<byte> buffer) => buffer[0];
 
-        private string ConvertToString(ReadOnlySpan<byte> buffer)
+        private string ConvertToString(Encoding encoding, ReadOnlySpan<byte> buffer)
         {
             int nullCharIndex = buffer.IndexOf((byte)0);
 
@@ -257,7 +253,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
                 buffer = buffer.Slice(0, nullCharIndex);
             }
 
-            return ExifConstants.DefaultEncoding.GetString(buffer);
+            return encoding.GetString(buffer);
         }
 
         private object ConvertValue(ExifValue exifValue, ExifDataType dataType, ReadOnlySpan<byte> buffer, bool isArray)
@@ -267,35 +263,20 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
                 return null;
             }
 
-            var tagValue = (ExifTagValue)(ushort)exifValue.Tag;
-            if (ExifUcs2StringHelpers.IsUcs2Tag(tagValue))
-            {
-                return ExifUcs2StringHelpers.ConvertToString(buffer);
-            }
-            else if (ExifEncodedStringHelpers.IsEncodedString(tagValue))
-            {
-                if (ExifEncodedStringHelpers.TryCreate(buffer, out EncodedString encodedString))
-                {
-                    return encodedString;
-                }
-            }
-
             switch (dataType)
             {
                 case ExifDataType.Unknown:
                     return null;
                 case ExifDataType.Ascii:
-                    return this.ConvertToString(buffer);
+                    return this.ConvertToString(ExifConstants.DefaultEncoding, buffer);
                 case ExifDataType.Byte:
                 case ExifDataType.Undefined:
-                {
                     if (!isArray)
                     {
                         return this.ConvertToByte(buffer);
                     }
 
-                    return ExifEncodedStringHelpers.TryCreate(buffer, out EncodedString encodedString) ? encodedString : buffer.ToArray();
+                    return buffer.ToArray();
-                }
 
                 case ExifDataType.DoubleFloat:
                     if (!isArray)

src/ImageSharp/Metadata/Profiles/Exif/ExifUcs2StringHelpers.cs

@@ -10,21 +10,10 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
     {
         public static Encoding Ucs2Encoding => Encoding.GetEncoding("UCS-2");
 
-        public static bool IsUcs2Tag(ExifTagValue tag)
+        public static bool IsUcs2Tag(ExifTagValue tag) => tag switch
         {
-            switch (tag)
+            ExifTagValue.XPAuthor or ExifTagValue.XPComment or ExifTagValue.XPKeywords or ExifTagValue.XPSubject or ExifTagValue.XPTitle => true,
-            {
+            _ => false,
-                case ExifTagValue.XPAuthor:
+        };
-                case ExifTagValue.XPComment:
-                case ExifTagValue.XPKeywords:
-                case ExifTagValue.XPSubject:
-                case ExifTagValue.XPTitle:
-                    return true;
-                default:
-                    return false;
-            }
-        }
-
-        public static string ConvertToString(ReadOnlySpan<byte> buffer) => Ucs2Encoding.GetString(buffer);
     }
 }

src/ImageSharp/Metadata/Profiles/Exif/ExifWriter.cs

@@ -274,9 +274,9 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
         {
             object value = exifValue.GetValue();
 
-            if (exifValue.DataType == ExifDataType.Ascii)
+            if (ExifUcs2StringHelpers.IsUcs2Tag((ExifTagValue)(ushort)exifValue.Tag))
             {
-                return (uint)(ExifUcs2StringHelpers.IsUcs2Tag((ExifTagValue)(ushort)exifValue.Tag) ? ExifUcs2StringHelpers.Ucs2Encoding : ExifConstants.DefaultEncoding).GetByteCount((string)value) + 1;
+                return (uint)ExifUcs2StringHelpers.Ucs2Encoding.GetByteCount((string)value);
             }
 
             if (value is EncodedString encodedString)
@@ -284,6 +284,11 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
                 return ExifEncodedStringHelpers.GetDataLength(encodedString);
             }
 
+            if (exifValue.DataType == ExifDataType.Ascii)
+            {
+                return (uint)ExifConstants.DefaultEncoding.GetByteCount((string)value) + 1;
+            }
+
             if (value is Array arrayValue)
             {
                 return (uint)arrayValue.Length;
@@ -378,21 +383,14 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
             switch (dataType)
             {
                 case ExifDataType.Ascii:
-                    offset = Write((ExifUcs2StringHelpers.IsUcs2Tag((ExifTagValue)(ushort)exifValue.Tag) ? ExifUcs2StringHelpers.Ucs2Encoding : ExifConstants.DefaultEncoding).GetBytes((string)value), destination, offset);
+                    offset = Write(ExifConstants.DefaultEncoding.GetBytes((string)value), destination, offset);
                     destination[offset] = 0;
                     return offset + 1;
                 case ExifDataType.Byte:
                 case ExifDataType.Undefined:
-                    if (value is EncodedString encodedString)
+                    if (value is byte[] array)
                     {
-                        ReadOnlySpan<byte> codeBytes = ExifEncodedStringHelpers.GetCodeBytes(encodedString.Code);
+                        offset = Write(array, destination, offset);
-                        codeBytes.CopyTo(destination.Slice(offset));
-                        offset += codeBytes.Length;
-
-                        ReadOnlySpan<byte> dataBytes = ExifEncodedStringHelpers.GetEncoding(encodedString.Code).GetBytes(encodedString.Text);
-                        dataBytes.CopyTo(destination.Slice(offset));
-                        offset += dataBytes.Length;
-
                         return offset;
                     }
                     else
@@ -441,14 +439,25 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
             }
         }
 
-        internal static int WriteValue(IExifValue value, Span<byte> destination, int offset)
+        internal static int WriteValue(IExifValue exifValue, Span<byte> destination, int offset)
         {
-            if (value.IsArray)
+            object value = exifValue.GetValue();
+
+            if (ExifUcs2StringHelpers.IsUcs2Tag((ExifTagValue)(ushort)exifValue.Tag))
+            {
+                value = ExifUcs2StringHelpers.Ucs2Encoding.GetBytes((string)value);
+            }
+            else if (value is EncodedString encodedString)
+            {
+                value = ExifEncodedStringHelpers.GetData(encodedString);
+            }
+
+            if (exifValue.IsArray)
             {
-                return WriteArray(value, destination, offset);
+                return WriteArray(exifValue, destination, offset);
             }
 
-            return WriteValue(value, value.DataType, value.GetValue(), destination, offset);
+            return WriteValue(exifValue, exifValue.DataType, value, destination, offset);
         }
     }
 }

src/ImageSharp/Metadata/Profiles/Exif/Tags/ExifTag.String.cs

@@ -275,30 +275,5 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
         /// Gets the GPSDateStamp exif tag.
         /// </summary>
         public static ExifTag<string> GPSDateStamp { get; } = new ExifTag<string>(ExifTagValue.GPSDateStamp);
-
-        /// <summary>
-        /// Gets the title tag used by Windows (encoded in UCS2).
-        /// </summary>
-        public static ExifTag<string> XPTitle => new ExifTag<string>(ExifTagValue.XPTitle);
-
-        /// <summary>
-        /// Gets the comment tag used by Windows (encoded in UCS2).
-        /// </summary>
-        public static ExifTag<string> XPComment => new ExifTag<string>(ExifTagValue.XPComment);
-
-        /// <summary>
-        /// Gets the author tag used by Windows (encoded in UCS2).
-        /// </summary>
-        public static ExifTag<string> XPAuthor => new ExifTag<string>(ExifTagValue.XPAuthor);
-
-        /// <summary>
-        /// Gets the keywords tag used by Windows (encoded in UCS2).
-        /// </summary>
-        public static ExifTag<string> XPKeywords => new ExifTag<string>(ExifTagValue.XPKeywords);
-
-        /// <summary>
-        /// Gets the subject tag used by Windows (encoded in UCS2).
-        /// </summary>
-        public static ExifTag<string> XPSubject => new ExifTag<string>(ExifTagValue.XPSubject);
     }
 }

src/ImageSharp/Metadata/Profiles/Exif/Tags/ExifTag.Ucs2String.cs

@@ -0,0 +1,34 @@
+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
+
+namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
+{
+    /// <content/>
+    public abstract partial class ExifTag
+    {
+        /// <summary>
+        /// Gets the title tag used by Windows (encoded in UCS2).
+        /// </summary>
+        public static ExifTag<string> XPTitle => new ExifTag<string>(ExifTagValue.XPTitle);
+
+        /// <summary>
+        /// Gets the comment tag used by Windows (encoded in UCS2).
+        /// </summary>
+        public static ExifTag<string> XPComment => new ExifTag<string>(ExifTagValue.XPComment);
+
+        /// <summary>
+        /// Gets the author tag used by Windows (encoded in UCS2).
+        /// </summary>
+        public static ExifTag<string> XPAuthor => new ExifTag<string>(ExifTagValue.XPAuthor);
+
+        /// <summary>
+        /// Gets the keywords tag used by Windows (encoded in UCS2).
+        /// </summary>
+        public static ExifTag<string> XPKeywords => new ExifTag<string>(ExifTagValue.XPKeywords);
+
+        /// <summary>
+        /// Gets the subject tag used by Windows (encoded in UCS2).
+        /// </summary>
+        public static ExifTag<string> XPSubject => new ExifTag<string>(ExifTagValue.XPSubject);
+    }
+}

src/ImageSharp/Metadata/Profiles/Exif/Values/EncodedString.cs

@@ -66,6 +66,18 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
         /// </summary>
         public string Text { get; }
 
+        /// <summary>
+        /// Converts the specified <see cref="string"/> to an instance of this type.
+        /// </summary>
+        /// <param name="text">The text value.</param>
+        public static implicit operator EncodedString(string text) => new(text);
+
+        /// <summary>
+        /// Converts the specified <see cref="EncodedString"/> to a <see cref="string"/>.
+        /// </summary>
+        /// <param name="encodedString">The <see cref="EncodedString"/> to convert.</param>
+        public static explicit operator string(EncodedString encodedString) => encodedString.Text;
+
         /// <inheritdoc/>
         public override bool Equals(object obj) => obj is EncodedString other && this.Equals(other);
 

src/ImageSharp/Metadata/Profiles/Exif/Values/ExifEncodedString.cs

@@ -38,6 +38,14 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
                 this.Value = new EncodedString(stringValue);
                 return true;
             }
+            else if (value is byte[] buffer)
+            {
+                if (ExifEncodedStringHelpers.TryParse(buffer, out EncodedString encodedString))
+                {
+                    this.Value = encodedString;
+                    return true;
+                }
+            }
 
             return false;
         }

src/ImageSharp/Metadata/Profiles/Exif/Values/ExifUcs2String.cs

@@ -0,0 +1,47 @@
+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
+
+namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
+{
+    internal sealed class ExifUcs2String : ExifValue<string>
+    {
+        public ExifUcs2String(ExifTag<string> tag)
+            : base(tag)
+        {
+        }
+
+        public ExifUcs2String(ExifTagValue tag)
+            : base(tag)
+        {
+        }
+
+        private ExifUcs2String(ExifUcs2String value)
+            : base(value)
+        {
+        }
+
+        public override ExifDataType DataType => ExifDataType.Byte;
+
+        protected override string StringValue => this.Value;
+
+        public override object GetValue() => this.Value;
+
+        public override bool TrySetValue(object value)
+        {
+            if (base.TrySetValue(value))
+            {
+                return true;
+            }
+
+            if (value is byte[] buffer)
+            {
+                this.Value = ExifUcs2StringHelpers.Ucs2Encoding.GetString(buffer);
+                return true;
+            }
+
+            return false;
+        }
+
+        public override IExifValue DeepClone() => new ExifUcs2String(this);
+    }
+}

src/ImageSharp/Metadata/Profiles/Exif/Values/ExifValues.cs

@@ -280,11 +280,6 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
                 case ExifTagValue.GPSDestBearingRef: return new ExifString(ExifTag.GPSDestBearingRef);
                 case ExifTagValue.GPSDestDistanceRef: return new ExifString(ExifTag.GPSDestDistanceRef);
                 case ExifTagValue.GPSDateStamp: return new ExifString(ExifTag.GPSDateStamp);
-                case ExifTagValue.XPTitle: return new ExifString(ExifTag.XPTitle);
-                case ExifTagValue.XPComment: return new ExifString(ExifTag.XPComment);
-                case ExifTagValue.XPAuthor: return new ExifString(ExifTag.XPAuthor);
-                case ExifTagValue.XPKeywords: return new ExifString(ExifTag.XPKeywords);
-                case ExifTagValue.XPSubject: return new ExifString(ExifTag.XPSubject);
 
                 case ExifTagValue.FileSource: return new ExifByte(ExifTag.FileSource, ExifDataType.Undefined);
                 case ExifTagValue.SceneType: return new ExifByte(ExifTag.SceneType, ExifDataType.Undefined);
@@ -302,6 +297,12 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
                 case ExifTagValue.DeviceSettingDescription: return new ExifByteArray(ExifTag.DeviceSettingDescription, ExifDataType.Undefined);
                 case ExifTagValue.ImageSourceData: return new ExifByteArray(ExifTag.ImageSourceData, ExifDataType.Undefined);
 
+                case ExifTagValue.XPTitle:  return new ExifUcs2String(ExifTag.XPTitle);
+                case ExifTagValue.XPComment: return new ExifUcs2String(ExifTag.XPComment);
+                case ExifTagValue.XPAuthor: return new ExifUcs2String(ExifTag.XPAuthor);
+                case ExifTagValue.XPKeywords: return new ExifUcs2String(ExifTag.XPKeywords);
+                case ExifTagValue.XPSubject: return new ExifUcs2String(ExifTag.XPSubject);
+
                 case ExifTagValue.UserComment: return new ExifEncodedString(ExifTag.UserComment);
                 case ExifTagValue.GPSProcessingMethod: return new ExifEncodedString(ExifTag.GPSProcessingMethod);
                 case ExifTagValue.GPSAreaInformation: return new ExifEncodedString(ExifTag.GPSAreaInformation);

tests/ImageSharp.Tests/Formats/Jpg/JpegDecoderTests.Metadata.cs

@@ -303,32 +303,56 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
         }
 
         [Fact]
-        public void ExifIfdStructure()
+        public void EncodedStringTags()
         {
             byte[] exifBytes;
             using var memoryStream = new MemoryStream();
             using (var image = Image.Load(TestFile.GetInputFileFullPath(TestImages.Jpeg.Baseline.Calliphora)))
             {
                 var exif = new ExifProfile();
-                exif.SetValue(ExifTag.XPAuthor, "Dan Petitt");
-
-                exif.SetValue(ExifTag.XPTitle, "A bit of test metadata for image title");
-                exif.SetValue(ExifTag.UserComment, new EncodedString(EncodedString.CharacterCode.ASCII, "A bit of normal comment text"));
 
                 exif.SetValue(ExifTag.GPSDateStamp, "2022-01-06");
-                exif.SetValue(ExifTag.XPKeywords, "Keywords");
 
-                image.Metadata.ExifProfile = exif;
+                exif.SetValue(ExifTag.XPTitle, "A bit of test metadata for image title");
+                exif.SetValue(ExifTag.XPComment, "A bit of test metadata for image comment");
+                exif.SetValue(ExifTag.XPAuthor, "Dan Petitt");
+                exif.SetValue(ExifTag.XPKeywords, "Keyword1;Keyword2");
+                exif.SetValue(ExifTag.XPSubject, "This is a subject");
+
+                exif.SetValue(ExifTag.UserComment, new EncodedString(EncodedString.CharacterCode.ASCII, "user comment (ASCII)"));
+                exif.SetValue(ExifTag.GPSProcessingMethod, new EncodedString(EncodedString.CharacterCode.JIS, "GPS processing method (JIS)"));
+                exif.SetValue(ExifTag.GPSAreaInformation, new EncodedString(EncodedString.CharacterCode.Unicode, "GPS area info (Unicode)"));
 
                 exifBytes = exif.ToByteArray();
 
+                image.Metadata.ExifProfile = exif;
+
+                image.Save(@"c:\\temp\1.jpeg");
                 image.Save(memoryStream, new JpegEncoder());
             }
 
             memoryStream.Seek(0, SeekOrigin.Begin);
             using (var image = Image.Load(memoryStream))
             {
-                Assert.NotNull(image.Metadata.ExifProfile);
+                ExifProfile exif = image.Metadata.ExifProfile;
+                Assert.NotNull(exif);
+
+                Assert.Equal("2022-01-06", exif.GetValue(ExifTag.GPSDateStamp).Value);
+
+                Assert.Equal("A bit of test metadata for image title", exif.GetValue(ExifTag.XPTitle).Value);
+                Assert.Equal("A bit of test metadata for image comment", exif.GetValue(ExifTag.XPComment).Value);
+                Assert.Equal("Dan Petitt", exif.GetValue(ExifTag.XPAuthor).Value);
+                Assert.Equal("Keyword1;Keyword2", exif.GetValue(ExifTag.XPKeywords).Value);
+                Assert.Equal("This is a subject", exif.GetValue(ExifTag.XPSubject).Value);
+
+                Assert.Equal("user comment (ASCII)", exif.GetValue(ExifTag.UserComment).Value.Text);
+                Assert.Equal(EncodedString.CharacterCode.ASCII, exif.GetValue(ExifTag.UserComment).Value.Code);
+
+                Assert.Equal("GPS processing method (JIS)", exif.GetValue(ExifTag.GPSProcessingMethod).Value.Text);
+                Assert.Equal(EncodedString.CharacterCode.JIS, exif.GetValue(ExifTag.GPSProcessingMethod).Value.Code);
+
+                Assert.Equal("GPS area info (Unicode)", exif.GetValue(ExifTag.GPSAreaInformation).Value.Text);
+                Assert.Equal(EncodedString.CharacterCode.Unicode, exif.GetValue(ExifTag.GPSAreaInformation).Value.Code);
             }
         }
     }

tests/ImageSharp.Tests/Metadata/Profiles/Exif/ExifProfileTests.cs

@@ -591,7 +591,7 @@ namespace SixLabors.ImageSharp.Tests.Metadata.Profiles.Exif
             foreach (IExifValue value in profile.Values)
             {
                 Assert.NotNull(value.GetValue());
-        }
+            }
 
             IExifValue<string> software = profile.GetValue(ExifTag.Software);
             Assert.Equal("Windows Photo Editor 10.0.10011.16384", software.Value);

tests/ImageSharp.Tests/Metadata/Profiles/Exif/Values/ExifValuesTests.cs

@@ -1,6 +1,8 @@
 // Copyright (c) Six Labors.
 // Licensed under the Apache License, Version 2.0.
 
+using System;
+using System.Text;
 using SixLabors.ImageSharp.Metadata.Profiles.Exif;
 using Xunit;
 
@@ -291,11 +293,6 @@ namespace SixLabors.ImageSharp.Tests.Metadata.Profiles.Exif.Values
             { ExifTag.GPSDestBearingRef },
             { ExifTag.GPSDestDistanceRef },
             { ExifTag.GPSDateStamp },
-            { ExifTag.XPTitle },
-            { ExifTag.XPComment },
-            { ExifTag.XPAuthor },
-            { ExifTag.XPKeywords },
-            { ExifTag.XPSubject },
         };
 
         public static TheoryData<ExifTag> UndefinedTags => new TheoryData<ExifTag>
@@ -327,6 +324,15 @@ namespace SixLabors.ImageSharp.Tests.Metadata.Profiles.Exif.Values
             { ExifTag.GPSAreaInformation }
         };
 
+        public static TheoryData<ExifTag> Ucs2StringTags => new TheoryData<ExifTag>
+        {
+            { ExifTag.XPTitle },
+            { ExifTag.XPComment },
+            { ExifTag.XPAuthor },
+            { ExifTag.XPKeywords },
+            { ExifTag.XPSubject },
+        };
+
         [Theory]
         [MemberData(nameof(ByteTags))]
         public void ExifByteTests(ExifTag tag)
@@ -602,13 +608,38 @@ namespace SixLabors.ImageSharp.Tests.Metadata.Profiles.Exif.Values
         [MemberData(nameof(EncodedStringTags))]
         public void ExifEncodedStringTests(ExifTag tag)
         {
-            var expected = new EncodedString(EncodedString.CharacterCode.JIS, "test string");
+            foreach (object code in Enum.GetValues(typeof(EncodedString.CharacterCode)))
+            {
+                var charCode = (EncodedString.CharacterCode)code;
+
+                const string expectedText = "test string";
+                var expected = new EncodedString(charCode, expectedText);
+                ExifValue value = ExifValues.Create(tag);
+
+                Assert.False(value.TrySetValue(123));
+                Assert.True(value.TrySetValue(expected));
+
+                var typed = (ExifEncodedString)value;
+                Assert.Equal(expected, typed.Value);
+                Assert.Equal(expectedText, (string)typed.Value);
+                Assert.Equal(charCode, typed.Value.Code);
+            }
+        }
+
+        [Theory]
+        [MemberData(nameof(Ucs2StringTags))]
+        public void ExifUcs2StringTests(ExifTag tag)
+        {
+            const string expected = "Dan Petitt";
             ExifValue value = ExifValues.Create(tag);
 
             Assert.False(value.TrySetValue(123));
             Assert.True(value.TrySetValue(expected));
 
-            var typed = (ExifEncodedString)value;
+            var typed = (ExifUcs2String)value;
+            Assert.Equal(expected, typed.Value);
+
+            Assert.True(value.TrySetValue(Encoding.GetEncoding("UCS-2").GetBytes(expected)));
             Assert.Equal(expected, typed.Value);
         }
     }