Initial

MareSynchronos/Services/CharaData/Models/MareCharaFileHeader.cs

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+namespace MareSynchronos.Services.CharaData.Models;
+
+public record MareCharaFileHeader(byte Version, MareCharaFileData CharaFileData)
+{
+    public static readonly byte CurrentVersion = 1;
+
+    public byte Version { get; set; } = Version;
+    public MareCharaFileData CharaFileData { get; set; } = CharaFileData;
+    public string FilePath { get; private set; } = string.Empty;
+
+    public void WriteToStream(BinaryWriter writer)
+    {
+        writer.Write('M');
+        writer.Write('C');
+        writer.Write('D');
+        writer.Write('F');
+        writer.Write(Version);
+        var charaFileDataArray = CharaFileData.ToByteArray();
+        writer.Write(charaFileDataArray.Length);
+        writer.Write(charaFileDataArray);
+    }
+
+    public static MareCharaFileHeader? FromBinaryReader(string path, BinaryReader reader)
+    {
+        var chars = new string(reader.ReadChars(4));
+        if (!string.Equals(chars, "MCDF", StringComparison.Ordinal)) throw new InvalidDataException("Not a Mare Chara File");
+
+        MareCharaFileHeader? decoded = null;
+
+        var version = reader.ReadByte();
+        if (version == 1)
+        {
+            var dataLength = reader.ReadInt32();
+
+            decoded = new(version, MareCharaFileData.FromByteArray(reader.ReadBytes(dataLength)))
+            {
+                FilePath = path,
+            };
+        }
+
+        return decoded;
+    }
+
+    public static void AdvanceReaderToData(BinaryReader reader)
+    {
+        reader.ReadChars(4);
+        var version = reader.ReadByte();
+        if (version == 1)
+        {
+            var length = reader.ReadInt32();
+            _ = reader.ReadBytes(length);
+        }
+    }
+}