diff --git a/CrossModel/Hashfile.Deserializer.cs b/CrossModel/Hashfile.Deserializer.cs
new file mode 100644
index 00000000..61364335
--- /dev/null
+++ b/CrossModel/Hashfile.Deserializer.cs
@@ -0,0 +1,251 @@
+using System.Collections.Generic;
+using System.Linq;
+using SabreTools.Models.Hashfile;
+
+namespace SabreTools.Serialization.CrossModel
+{
+    public partial class Hashfile : IModelSerializer<Models.Hashfile.Hashfile, Models.Metadata.MetadataFile>
+    {
+        /// <inheritdoc/>
+#if NET48
+        public Models.Hashfile.Hashfile Deserialize(Models.Metadata.MetadataFile obj) => Deserialize(obj, Hash.CRC);
+#else
+        public Models.Hashfile.Hashfile? Deserialize(Models.Metadata.MetadataFile? obj) => Deserialize(obj, Hash.CRC);
+#endif
+
+        /// <inheritdoc/>
+#if NET48
+        public Models.Hashfile.Hashfile Deserialize(Models.Metadata.MetadataFile obj, Hash hash)
+#else
+        public Models.Hashfile.Hashfile? Deserialize(Models.Metadata.MetadataFile? obj, Hash hash)
+#endif
+        {
+            if (obj == null)
+                return null;
+
+            var machines = obj.Read<Models.Metadata.Machine[]>(Models.Metadata.MetadataFile.MachineKey);
+            if (machines == null || !machines.Any())
+                return null;
+
+            var hashfiles = machines
+                .Where(m => m != null)
+                .Select(machine => ConvertMachineFromInternalModel(machine, hash));
+
+            var sfvs = new List<SFV>();
+            var md5s = new List<MD5>();
+            var sha1s = new List<SHA1>();
+            var sha256s = new List<SHA256>();
+            var sha384s = new List<SHA384>();
+            var sha512s = new List<SHA512>();
+            var spamsums = new List<SpamSum>();
+
+            foreach (var hashfile in hashfiles)
+            {
+                if (hashfile.SFV != null && hashfile.SFV.Any())
+                    sfvs.AddRange(hashfile.SFV);
+                if (hashfile.MD5 != null && hashfile.MD5.Any())
+                    md5s.AddRange(hashfile.MD5);
+                if (hashfile.SHA1 != null && hashfile.SHA1.Any())
+                    sha1s.AddRange(hashfile.SHA1);
+                if (hashfile.SHA256 != null && hashfile.SHA256.Any())
+                    sha256s.AddRange(hashfile.SHA256);
+                if (hashfile.SHA384 != null && hashfile.SHA384.Any())
+                    sha384s.AddRange(hashfile.SHA384);
+                if (hashfile.SHA512 != null && hashfile.SHA512.Any())
+                    sha512s.AddRange(hashfile.SHA512);
+                if (hashfile.SpamSum != null && hashfile.SpamSum.Any())
+                    spamsums.AddRange(hashfile.SpamSum);
+            }
+
+            var hashfileItem = new Models.Hashfile.Hashfile();
+
+            if (sfvs.Any())
+                hashfileItem.SFV = sfvs.ToArray();
+            if (md5s.Any())
+                hashfileItem.MD5 = md5s.ToArray();
+            if (sha1s.Any())
+                hashfileItem.SHA1 = sha1s.ToArray();
+            if (sha256s.Any())
+                hashfileItem.SHA256 = sha256s.ToArray();
+            if (sha384s.Any())
+                hashfileItem.SHA384 = sha384s.ToArray();
+            if (sha512s.Any())
+                hashfileItem.SHA512 = sha512s.ToArray();
+            if (spamsums.Any())
+                hashfileItem.SpamSum = spamsums.ToArray();
+
+            return hashfileItem;
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.Metadata.MetadataFile"/> to an array of <cref="Models.Hashfile.Hashfile"/>
+        /// </summary>
+#if NET48
+        public static Models.Hashfile.Hashfile[] ConvertArrayFromInternalModel(Models.Metadata.MetadataFile item, Hash hash)
+#else
+        public static Models.Hashfile.Hashfile[]? ConvertArrayFromInternalModel(Models.Metadata.MetadataFile? item, Hash hash)
+#endif
+        {
+            if (item == null)
+                return null;
+
+            var machines = item.Read<Models.Metadata.Machine[]>(Models.Metadata.MetadataFile.MachineKey);
+            if (machines != null && machines.Any())
+            {
+                return machines
+                    .Where(m => m != null)
+                    .Select(machine => ConvertMachineFromInternalModel(machine, hash))
+                    .ToArray();
+            }
+
+            return null;
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.Metadata.Machine"/> to <cref="Models.Hashfile.Hashfile"/>
+        /// </summary>
+        private static Models.Hashfile.Hashfile ConvertMachineFromInternalModel(Models.Metadata.Machine item, Hash hash)
+        {
+            var roms = item.Read<Models.Metadata.Rom[]>(Models.Metadata.Machine.RomKey);
+            if (roms == null)
+                return new Models.Hashfile.Hashfile();
+
+            return new Models.Hashfile.Hashfile
+            {
+                SFV = hash == Hash.CRC
+                    ? roms
+                        .Where(r => r != null)
+                        .Select(ConvertToSFV)
+                        .ToArray()
+                    : null,
+                MD5 = hash == Hash.MD5
+                    ? roms
+                        .Where(r => r != null)
+                        .Select(ConvertToMD5)
+                        .ToArray()
+                    : null,
+                SHA1 = hash == Hash.SHA1
+                    ? roms
+                        .Where(r => r != null)
+                        .Select(ConvertToSHA1)
+                        .ToArray()
+                    : null,
+                SHA256 = hash == Hash.SHA256
+                    ? roms
+                        .Where(r => r != null)
+                        .Select(ConvertToSHA256)
+                        .ToArray()
+                    : null,
+                SHA384 = hash == Hash.SHA384
+                    ? roms
+                        .Where(r => r != null)
+                        .Select(ConvertToSHA384)
+                        .ToArray()
+                    : null,
+                SHA512 = hash == Hash.SHA512
+                    ? roms
+                        .Where(r => r != null)
+                        .Select(ConvertToSHA512)
+                        .ToArray()
+                    : null,
+                SpamSum = hash == Hash.SpamSum
+                    ? roms
+                        .Where(r => r != null)
+                        .Select(ConvertToSpamSum)
+                        .ToArray()
+                    : null,
+            };
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.Metadata.Rom"/> to <cref="Models.Hashfile.MD5"/>
+        /// </summary>
+        private static MD5 ConvertToMD5(Models.Metadata.Rom item)
+        {
+            var md5 = new MD5
+            {
+                Hash = item.ReadString(Models.Metadata.Rom.MD5Key),
+                File = item.ReadString(Models.Metadata.Rom.NameKey),
+            };
+            return md5;
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.Metadata.Rom"/> to <cref="Models.Hashfile.SFV"/>
+        /// </summary>
+        private static SFV ConvertToSFV(Models.Metadata.Rom item)
+        {
+            var sfv = new SFV
+            {
+                File = item.ReadString(Models.Metadata.Rom.NameKey),
+                Hash = item.ReadString(Models.Metadata.Rom.CRCKey),
+            };
+            return sfv;
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.Metadata.Rom"/> to <cref="Models.Hashfile.SHA1"/>
+        /// </summary>
+        private static SHA1 ConvertToSHA1(Models.Metadata.Rom item)
+        {
+            var sha1 = new SHA1
+            {
+                Hash = item.ReadString(Models.Metadata.Rom.SHA1Key),
+                File = item.ReadString(Models.Metadata.Rom.NameKey),
+            };
+            return sha1;
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.Metadata.Rom"/> to <cref="Models.Hashfile.SHA256"/>
+        /// </summary>
+        private static SHA256 ConvertToSHA256(Models.Metadata.Rom item)
+        {
+            var sha256 = new SHA256
+            {
+                Hash = item.ReadString(Models.Metadata.Rom.SHA256Key),
+                File = item.ReadString(Models.Metadata.Rom.NameKey),
+            };
+            return sha256;
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.Metadata.Rom"/> to <cref="Models.Hashfile.SHA384"/>
+        /// </summary>
+        private static SHA384 ConvertToSHA384(Models.Metadata.Rom item)
+        {
+            var sha384 = new SHA384
+            {
+                Hash = item.ReadString(Models.Metadata.Rom.SHA384Key),
+                File = item.ReadString(Models.Metadata.Rom.NameKey),
+            };
+            return sha384;
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.Metadata.Rom"/> to <cref="Models.Hashfile.SHA512"/>
+        /// </summary>
+        private static SHA512 ConvertToSHA512(Models.Metadata.Rom item)
+        {
+            var sha512 = new SHA512
+            {
+                Hash = item.ReadString(Models.Metadata.Rom.SHA512Key),
+                File = item.ReadString(Models.Metadata.Rom.NameKey),
+            };
+            return sha512;
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.Metadata.Rom"/> to <cref="Models.Hashfile.SpamSum"/>
+        /// </summary>
+        private static SpamSum ConvertToSpamSum(Models.Metadata.Rom item)
+        {
+            var spamsum = new SpamSum
+            {
+                Hash = item.ReadString(Models.Metadata.Rom.SpamSumKey),
+                File = item.ReadString(Models.Metadata.Rom.NameKey),
+            };
+            return spamsum;
+        }
+    }
+}
\ No newline at end of file
diff --git a/CrossModel/Hashfile.Serializer.cs b/CrossModel/Hashfile.Serializer.cs
new file mode 100644
index 00000000..dad79c80
--- /dev/null
+++ b/CrossModel/Hashfile.Serializer.cs
@@ -0,0 +1,157 @@
+using System.Linq;
+using SabreTools.Models.Hashfile;
+
+namespace SabreTools.Serialization.CrossModel
+{
+    public partial class Hashfile : IModelSerializer<Models.Hashfile.Hashfile, Models.Metadata.MetadataFile>
+    {
+        /// <inheritdoc/>
+#if NET48
+        public Models.Metadata.MetadataFile Serialize(Models.Hashfile.Hashfile obj)
+#else
+        public Models.Metadata.MetadataFile? Serialize(Models.Hashfile.Hashfile? obj)
+#endif
+        {
+            if (obj == null)
+                return null;
+            
+            var metadataFile = new Models.Metadata.MetadataFile
+            {
+                [Models.Metadata.MetadataFile.HeaderKey] = ConvertHeaderToInternalModel(),
+            };
+
+            var machine = ConvertMachineToInternalModel(obj);
+            metadataFile[Models.Metadata.MetadataFile.MachineKey] = new Models.Metadata.Machine[] { machine };
+
+            return metadataFile;
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.Hashfile.Hashfile"/> to <cref="Models.Metadata.Header"/>
+        /// </summary>
+        private static Models.Metadata.Header ConvertHeaderToInternalModel()
+        {
+            var header = new Models.Metadata.Header
+            {
+                [Models.Metadata.Header.NameKey] = "Hashfile",
+            };
+            return header;
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.Hashfile.Hashfile"/> to <cref="Models.Metadata.Machine"/>
+        /// </summary>
+        private static Models.Metadata.Machine ConvertMachineToInternalModel(Models.Hashfile.Hashfile item)
+        {
+            var machine = new Models.Metadata.Machine();
+
+            if (item.SFV != null && item.SFV.Any())
+                machine[Models.Metadata.Machine.RomKey] = item.SFV.Select(ConvertToInternalModel).ToArray();
+            else if (item.MD5 != null && item.MD5.Any())
+                machine[Models.Metadata.Machine.RomKey] = item.MD5.Select(ConvertToInternalModel).ToArray();
+            else if (item.SHA1 != null && item.SHA1.Any())
+                machine[Models.Metadata.Machine.RomKey] = item.SHA1.Select(ConvertToInternalModel).ToArray();
+            else if (item.SHA256 != null && item.SHA256.Any())
+                machine[Models.Metadata.Machine.RomKey] = item.SHA256.Select(ConvertToInternalModel).ToArray();
+            else if (item.SHA384 != null && item.SHA384.Any())
+                machine[Models.Metadata.Machine.RomKey] = item.SHA384.Select(ConvertToInternalModel).ToArray();
+            else if (item.SHA512 != null && item.SHA512.Any())
+                machine[Models.Metadata.Machine.RomKey] = item.SHA512.Select(ConvertToInternalModel).ToArray();
+            else if (item.SpamSum != null && item.SpamSum.Any())
+                machine[Models.Metadata.Machine.RomKey] = item.SpamSum.Select(ConvertToInternalModel).ToArray();
+
+            return machine;
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.Hashfile.MD5"/> to <cref="Models.Metadata.Rom"/>
+        /// </summary>
+        private static Models.Metadata.Rom ConvertToInternalModel(MD5 item)
+        {
+            var rom = new Models.Metadata.Rom
+            {
+                [Models.Metadata.Rom.MD5Key] = item.Hash,
+                [Models.Metadata.Rom.NameKey] = item.File,
+            };
+            return rom;
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.Hashfile.SFV"/> to <cref="Models.Metadata.Rom"/>
+        /// </summary>
+        private static Models.Metadata.Rom ConvertToInternalModel(SFV item)
+        {
+            var rom = new Models.Metadata.Rom
+            {
+                [Models.Metadata.Rom.NameKey] = item.File,
+                [Models.Metadata.Rom.CRCKey] = item.Hash,
+            };
+            return rom;
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.Hashfile.SHA1"/> to <cref="Models.Metadata.Rom"/>
+        /// </summary>
+        private static Models.Metadata.Rom ConvertToInternalModel(SHA1 item)
+        {
+            var rom = new Models.Metadata.Rom
+            {
+                [Models.Metadata.Rom.SHA1Key] = item.Hash,
+                [Models.Metadata.Rom.NameKey] = item.File,
+            };
+            return rom;
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.Hashfile.SHA256"/> to <cref="Models.Metadata.Rom"/>
+        /// </summary>
+        private static Models.Metadata.Rom ConvertToInternalModel(SHA256 item)
+        {
+            var rom = new Models.Metadata.Rom
+            {
+                [Models.Metadata.Rom.SHA256Key] = item.Hash,
+                [Models.Metadata.Rom.NameKey] = item.File,
+            };
+            return rom;
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.Hashfile.SHA384"/> to <cref="Models.Metadata.Rom"/>
+        /// </summary>
+        private static Models.Metadata.Rom ConvertToInternalModel(SHA384 item)
+        {
+            var rom = new Models.Metadata.Rom
+            {
+                [Models.Metadata.Rom.SHA384Key] = item.Hash,
+                [Models.Metadata.Rom.NameKey] = item.File,
+            };
+            return rom;
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.Hashfile.SHA512"/> to <cref="Models.Metadata.Rom"/>
+        /// </summary>
+        private static Models.Metadata.Rom ConvertToInternalModel(SHA512 item)
+        {
+            var rom = new Models.Metadata.Rom
+            {
+                [Models.Metadata.Rom.SHA512Key] = item.Hash,
+                [Models.Metadata.Rom.NameKey] = item.File,
+            };
+            return rom;
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.Hashfile.SpamSum"/> to <cref="Models.Metadata.Rom"/>
+        /// </summary>
+        private static Models.Metadata.Rom ConvertToInternalModel(SpamSum item)
+        {
+            var rom = new Models.Metadata.Rom
+            {
+                [Models.Metadata.Rom.SpamSumKey] = item.Hash,
+                [Models.Metadata.Rom.NameKey] = item.File,
+            };
+            return rom;
+        }
+    }
+}
\ No newline at end of file
diff --git a/Files/Hashfile.Deserializer.cs b/Files/Hashfile.Deserializer.cs
new file mode 100644
index 00000000..f4538eda
--- /dev/null
+++ b/Files/Hashfile.Deserializer.cs
@@ -0,0 +1,18 @@
+namespace SabreTools.Serialization.Files
+{
+    public partial class Hashfile : IFileSerializer<Models.Hashfile.Hashfile>
+    {
+        /// <inheritdoc/>
+#if NET48
+        public Models.Hashfile.Hashfile Deserialize(string path)
+#else
+        public Models.Hashfile.Hashfile? Deserialize(string? path)
+#endif
+        {
+            using (var stream = PathProcessor.OpenStream(path))
+            {
+                return new Streams.Hashfile().Deserialize(stream);
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/Files/Hashfile.Serializer.cs b/Files/Hashfile.Serializer.cs
new file mode 100644
index 00000000..3122c0cd
--- /dev/null
+++ b/Files/Hashfile.Serializer.cs
@@ -0,0 +1,25 @@
+namespace SabreTools.Serialization.Files
+{
+    public partial class Hashfile : IFileSerializer<Models.Hashfile.Hashfile>
+    {
+        /// <inheritdoc/>
+#if NET48
+        public bool Serialize(Models.Hashfile.Hashfile obj, string path)
+#else
+        public bool Serialize(Models.Hashfile.Hashfile? obj, string? path)
+#endif
+        {
+            using (var stream = new Streams.Hashfile().Serialize(obj))
+            {
+                if (stream == null)
+                    return false;
+
+                using (var fs = System.IO.File.OpenWrite(path))
+                {
+                    stream.CopyTo(fs);
+                    return true;
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/Streams/HashFile.Deserializer.cs b/Streams/HashFile.Deserializer.cs
new file mode 100644
index 00000000..3dac02b7
--- /dev/null
+++ b/Streams/HashFile.Deserializer.cs
@@ -0,0 +1,169 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using SabreTools.Models.Hashfile;
+
+namespace SabreTools.Serialization.Streams
+{
+    public partial class Hashfile : IStreamSerializer<Models.Hashfile.Hashfile>
+    {
+        /// <inheritdoc/>
+#if NET48
+        public Models.Hashfile.Hashfile Deserialize(Stream data) => Deserialize(data, Hash.CRC);
+#else
+        public Models.Hashfile.Hashfile? Deserialize(Stream? data) => Deserialize(data, Hash.CRC);
+#endif
+
+        /// <inheritdoc cref="Deserialize(Stream)"/>
+#if NET48
+        public Models.Hashfile.Hashfile Deserialize(Stream data, Hash hash)
+#else
+        public Models.Hashfile.Hashfile? Deserialize(Stream? data, Hash hash)
+#endif
+        {
+            // If the stream is null
+            if (data == null)
+                return default;
+
+            // Setup the reader and output
+            var reader = new StreamReader(data);
+            var dat = new Models.Hashfile.Hashfile();
+            var additional = new List<string>();
+
+            // Loop through the rows and parse out values
+            var hashes = new List<object>();
+            while (!reader.EndOfStream)
+            {
+                // Read and split the line
+#if NET48
+                string line = reader.ReadLine();
+                string[] lineParts = line?.Split(new char[] { ' ' } , StringSplitOptions.RemoveEmptyEntries);
+#else
+                string? line = reader.ReadLine();
+                string[]? lineParts = line?.Split(' ', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
+#endif
+                if (lineParts == null)
+                    continue;
+
+                // Parse the line into a hash
+                switch (hash)
+                {
+                    case Hash.CRC:
+                        var sfv = new SFV
+                        {
+#if NET48
+                            File = string.Join(" ", lineParts.Take(lineParts.Length - 1)),
+                            Hash = lineParts[lineParts.Length - 1],
+#else
+                            File = string.Join(" ", lineParts[..^1]),
+                            Hash = lineParts[^1],
+#endif
+                        };
+                        hashes.Add(sfv);
+                        break;
+                    case Hash.MD5:
+                        var md5 = new MD5
+                        {
+                            Hash = lineParts[0],
+#if NET48
+                            File = string.Join(" ", lineParts.Skip(1)),
+#else
+                            File = string.Join(" ", lineParts[1..]),
+#endif
+                        };
+                        hashes.Add(md5);
+                        break;
+                    case Hash.SHA1:
+                        var sha1 = new SHA1
+                        {
+                            Hash = lineParts[0],
+#if NET48
+                            File = string.Join(" ", lineParts.Skip(1)),
+#else
+                            File = string.Join(" ", lineParts[1..]),
+#endif
+                        };
+                        hashes.Add(sha1);
+                        break;
+                    case Hash.SHA256:
+                        var sha256 = new SHA256
+                        {
+                            Hash = lineParts[0],
+#if NET48
+                            File = string.Join(" ", lineParts.Skip(1)),
+#else
+                            File = string.Join(" ", lineParts[1..]),
+#endif
+                        };
+                        hashes.Add(sha256);
+                        break;
+                    case Hash.SHA384:
+                        var sha384 = new SHA384
+                        {
+                            Hash = lineParts[0],
+#if NET48
+                            File = string.Join(" ", lineParts.Skip(1)),
+#else
+                            File = string.Join(" ", lineParts[1..]),
+#endif
+                        };
+                        hashes.Add(sha384);
+                        break;
+                    case Hash.SHA512:
+                        var sha512 = new SHA512
+                        {
+                            Hash = lineParts[0],
+#if NET48
+                            File = string.Join(" ", lineParts.Skip(1)),
+#else
+                            File = string.Join(" ", lineParts[1..]),
+#endif
+                        };
+                        hashes.Add(sha512);
+                        break;
+                    case Hash.SpamSum:
+                        var spamSum = new SpamSum
+                        {
+                            Hash = lineParts[0],
+#if NET48
+                            File = string.Join(" ", lineParts.Skip(1)),
+#else
+                            File = string.Join(" ", lineParts[1..]),
+#endif
+                        };
+                        hashes.Add(spamSum);
+                        break;
+                }
+            }
+
+            // Assign the hashes to the hashfile and return
+            switch (hash)
+            {
+                case Hash.CRC:
+                    dat.SFV = hashes.Cast<SFV>().ToArray();
+                    break;
+                case Hash.MD5:
+                    dat.MD5 = hashes.Cast<MD5>().ToArray();
+                    break;
+                case Hash.SHA1:
+                    dat.SHA1 = hashes.Cast<SHA1>().ToArray();
+                    break;
+                case Hash.SHA256:
+                    dat.SHA256 = hashes.Cast<SHA256>().ToArray();
+                    break;
+                case Hash.SHA384:
+                    dat.SHA384 = hashes.Cast<SHA384>().ToArray();
+                    break;
+                case Hash.SHA512:
+                    dat.SHA512 = hashes.Cast<SHA512>().ToArray();
+                    break;
+                case Hash.SpamSum:
+                    dat.SpamSum = hashes.Cast<SpamSum>().ToArray();
+                    break;
+            }
+            dat.ADDITIONAL_ELEMENTS = additional.ToArray();
+            return dat;
+        }
+    }
+}
\ No newline at end of file
diff --git a/Streams/Hashfile.Serializer.cs b/Streams/Hashfile.Serializer.cs
new file mode 100644
index 00000000..c6e3d95d
--- /dev/null
+++ b/Streams/Hashfile.Serializer.cs
@@ -0,0 +1,268 @@
+using System;
+using System.IO;
+using System.Linq;
+using System.Text;
+using SabreTools.IO.Writers;
+using SabreTools.Models.Hashfile;
+
+namespace SabreTools.Serialization.Streams
+{
+    public partial class Hashfile : IStreamSerializer<Models.Hashfile.Hashfile>
+    {
+        /// <inheritdoc/>
+#if NET48
+        public Stream Serialize(Models.Hashfile.Hashfile obj) => Serialize(obj, Hash.CRC);
+#else
+        public Stream? Serialize(Models.Hashfile.Hashfile? obj) => Serialize(obj, Hash.CRC);
+#endif
+
+        /// <inheritdoc/>
+#if NET48
+        public Stream Serialize(Models.Hashfile.Hashfile obj, Hash hash)
+#else
+        public Stream? Serialize(Models.Hashfile.Hashfile? obj, Hash hash)
+#endif
+        {
+            // If the metadata file is null
+            if (obj == null)
+                return null;
+
+            // Setup the writer and output
+            var stream = new MemoryStream();
+            var writer = new SeparatedValueWriter(stream, Encoding.UTF8)
+            {
+                Separator = ' ',
+                Quotes = false,
+                VerifyFieldCount = false,
+            };
+
+            // Write out the items, if they exist
+            switch (hash)
+            {
+                case Hash.CRC:
+                    WriteSFV(obj.SFV, writer);
+                    break;
+                case Hash.MD5:
+                    WriteMD5(obj.MD5, writer);
+                    break;
+                case Hash.SHA1:
+                    WriteSHA1(obj.SHA1, writer);
+                    break;
+                case Hash.SHA256:
+                    WriteSHA256(obj.SHA256, writer);
+                    break;
+                case Hash.SHA384:
+                    WriteSHA384(obj.SHA384, writer);
+                    break;
+                case Hash.SHA512:
+                    WriteSHA512(obj.SHA512, writer);
+                    break;
+                case Hash.SpamSum:
+                    WriteSpamSum(obj.SpamSum, writer);
+                    break;
+                default:
+                    throw new ArgumentOutOfRangeException(nameof(hash));
+            }
+
+            // Return the stream
+            stream.Seek(0, SeekOrigin.Begin);
+            return stream;
+        }
+
+        /// <summary>
+        /// Write SFV information to the current writer
+        /// </summary>
+        /// <param name="sfvs">Array of SFV objects representing the files</param>
+        /// <param name="writer">SeparatedValueWriter representing the output</param>
+#if NET48
+        private static void WriteSFV(SFV[] sfvs, SeparatedValueWriter writer)
+#else
+        private static void WriteSFV(SFV[]? sfvs, SeparatedValueWriter writer)
+#endif
+        {
+            // If the item information is missing, we can't do anything
+            if (sfvs == null || !sfvs.Any())
+                return;
+
+            // Loop through and write out the items
+            foreach (var sfv in sfvs)
+            {
+                if (sfv == null)
+                    continue;
+                if (string.IsNullOrWhiteSpace(sfv.File) || string.IsNullOrWhiteSpace(sfv.Hash))
+                    continue;
+
+                writer.WriteValues(new string[] { sfv.File, sfv.Hash });
+                writer.Flush();
+            }
+        }
+
+        /// <summary>
+        /// Write MD5 information to the current writer
+        /// </summary>
+        /// <param name="md5s">Array of MD5 objects representing the files</param>
+        /// <param name="writer">SeparatedValueWriter representing the output</param>
+#if NET48
+        private static void WriteMD5(MD5[] md5s, SeparatedValueWriter writer)
+#else
+        private static void WriteMD5(MD5[]? md5s, SeparatedValueWriter writer)
+#endif
+        {
+            // If the item information is missing, we can't do anything
+            if (md5s == null || !md5s.Any())
+                return;
+
+            // Loop through and write out the items
+            foreach (var md5 in md5s)
+            {
+                if (md5 == null)
+                    continue;
+                if (string.IsNullOrWhiteSpace(md5.Hash) || string.IsNullOrWhiteSpace(md5.File))
+                    continue;
+
+                writer.WriteValues(new string[] { md5.Hash, md5.File });
+                writer.Flush();
+            }
+        }
+
+        /// <summary>
+        /// Write SHA1 information to the current writer
+        /// </summary>
+        /// <param name="sha1s">Array of SHA1 objects representing the files</param>
+        /// <param name="writer">SeparatedValueWriter representing the output</param>
+#if NET48
+        private static void WriteSHA1(SHA1[] sha1s, SeparatedValueWriter writer)
+#else
+        private static void WriteSHA1(SHA1[]? sha1s, SeparatedValueWriter writer)
+#endif
+        {
+            // If the item information is missing, we can't do anything
+            if (sha1s == null || !sha1s.Any())
+                return;
+
+            // Loop through and write out the items
+            foreach (var sha1 in sha1s)
+            {
+                if (sha1 == null)
+                    continue;
+                if (string.IsNullOrWhiteSpace(sha1.Hash) || string.IsNullOrWhiteSpace(sha1.File))
+                    continue;
+
+                writer.WriteValues(new string[] { sha1.Hash, sha1.File });
+                writer.Flush();
+            }
+        }
+
+        /// <summary>
+        /// Write SHA256 information to the current writer
+        /// </summary>
+        /// <param name="sha256s">Array of SHA256 objects representing the files</param>
+        /// <param name="writer">SeparatedValueWriter representing the output</param>
+#if NET48
+        private static void WriteSHA256(SHA256[] sha256s, SeparatedValueWriter writer)
+#else
+        private static void WriteSHA256(SHA256[]? sha256s, SeparatedValueWriter writer)
+#endif
+        {
+            // If the item information is missing, we can't do anything
+            if (sha256s == null || !sha256s.Any())
+                return;
+
+            // Loop through and write out the items
+            foreach (var sha256 in sha256s)
+            {
+                if (sha256 == null)
+                    continue;
+                if (string.IsNullOrWhiteSpace(sha256.Hash) || string.IsNullOrWhiteSpace(sha256.File))
+                    continue;
+
+                writer.WriteValues(new string[] { sha256.Hash, sha256.File });
+                writer.Flush();
+            }
+        }
+
+        /// <summary>
+        /// Write SHA384 information to the current writer
+        /// </summary>
+        /// <param name="sha384s">Array of SHA384 objects representing the files</param>
+        /// <param name="writer">SeparatedValueWriter representing the output</param>
+#if NET48
+        private static void WriteSHA384(SHA384[] sha384s, SeparatedValueWriter writer)
+#else
+        private static void WriteSHA384(SHA384[]? sha384s, SeparatedValueWriter writer)
+#endif
+        {
+            // If the item information is missing, we can't do anything
+            if (sha384s == null || !sha384s.Any())
+                return;
+
+            // Loop through and write out the items
+            foreach (var sha384 in sha384s)
+            {
+                if (sha384 == null)
+                    continue;
+                if (string.IsNullOrWhiteSpace(sha384.Hash) || string.IsNullOrWhiteSpace(sha384.File))
+                    continue;
+
+                writer.WriteValues(new string[] { sha384.Hash, sha384.File });
+                writer.Flush();
+            }
+        }
+
+        /// <summary>
+        /// Write SHA512 information to the current writer
+        /// </summary>
+        /// <param name="sha512s">Array of SHA512 objects representing the files</param>
+        /// <param name="writer">SeparatedValueWriter representing the output</param>
+#if NET48
+        private static void WriteSHA512(SHA512[] sha512s, SeparatedValueWriter writer)
+#else
+        private static void WriteSHA512(SHA512[]? sha512s, SeparatedValueWriter writer)
+#endif
+        {
+            // If the item information is missing, we can't do anything
+            if (sha512s == null || !sha512s.Any())
+                return;
+
+            // Loop through and write out the items
+            foreach (var sha512 in sha512s)
+            {
+                if (sha512 == null)
+                    continue;
+                if (string.IsNullOrWhiteSpace(sha512.Hash) || string.IsNullOrWhiteSpace(sha512.File))
+                    continue;
+
+                writer.WriteValues(new string[] { sha512.Hash, sha512.File });
+                writer.Flush();
+            }
+        }
+
+        /// <summary>
+        /// Write SpamSum information to the current writer
+        /// </summary>
+        /// <param name="spamsums">Array of SpamSum objects representing the files</param>
+        /// <param name="writer">SeparatedValueWriter representing the output</param>
+#if NET48
+        private static void WriteSpamSum(SpamSum[] spamsums, SeparatedValueWriter writer)
+#else
+        private static void WriteSpamSum(SpamSum[]? spamsums, SeparatedValueWriter writer)
+#endif
+        {
+            // If the item information is missing, we can't do anything
+            if (spamsums == null || !spamsums.Any())
+                return;
+
+            // Loop through and write out the items
+            foreach (var spamsum in spamsums)
+            {
+                if (spamsum == null)
+                    continue;
+                if (string.IsNullOrWhiteSpace(spamsum.Hash) || string.IsNullOrWhiteSpace(spamsum.File))
+                    continue;
+
+                writer.WriteValues(new string[] { spamsum.Hash, spamsum.File });
+                writer.Flush();
+            }
+        }
+    }
+}
\ No newline at end of file