Quick update.

ReMime.ReFile/Program.cs

@@ -2,6 +2,8 @@
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.IO;
+using System.Linq;
+using Microsoft.VisualBasic;
 
 namespace ReMime.Cli
 {
@@ -47,7 +49,10 @@ namespace ReMime.Cli
         [DoesNotReturn]
         private static void ListTypes()
         {
-            foreach (MediaType type in MediaTypeResolver.KnownTypes)
+            var list = MediaTypeResolver.KnownTypes.ToList();
+            list.Sort();
+
+            foreach (MediaType type in list)
             {
                 Console.WriteLine("{0}\t{1}", type.FullTypeNoParameters, string.Join(' ', type.Extensions));
             }

ReMime.ReFile/ReMime.ReFile.csproj

@@ -9,7 +9,7 @@
     <!--NuGet-->
     <GeneratePackageOnBuild>True</GeneratePackageOnBuild>
     <PackageId>ReFuel.ReMime.ReFile</PackageId>
-    <Version>0.1.0</Version>
+    <Version>0.1.1</Version>
     <Authors>H. Utku Maden</Authors>
     <Company>ReFuel</Company>
     <PackageReadmeFile>README.md</PackageReadmeFile>
@@ -34,7 +34,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="ReFuel.ReMime" Version="0.1.0" />
+    <PackageReference Include="ReFuel.ReMime" Version="0.1.1" />
 
     <Content Include="README.md" Pack="true" PackagePath="/" />
     <Content Include="../LICENSE.md" Pack="true" PackagePath="/" />

ReMime.Tests/MediaTypesByExtension.cs

@@ -3,21 +3,9 @@ using ReMime.Platform;
 
 namespace ReMime.Tests
 {
-    public abstract class MediaTypesByExtension<T> where T : IMediaTypeResolver, new()
+    [TestClass]
+    public class MediaTypesByExtension
     {
-        private T CIT;
-
-        protected MediaTypesByExtension()
-        {
-            Unsafe.SkipInit(out CIT);
-        }
-
-        [TestInitialize]
-        public virtual void Initialize()
-        {
-            CIT = new T();
-        }
-
         readonly (string extension, string type)[] ExampleMimeTypes = new (string, string)[] {
             ("png", "image/png"),
             ("gif", "image/gif"),
@@ -34,44 +22,10 @@ namespace ReMime.Tests
         {
             foreach (var(ext, type) in ExampleMimeTypes)
             {
-                Assert.IsTrue(CIT.TryResolve(ext, out MediaType? result));
+                Assert.IsTrue(MediaTypeResolver.TryResolve(ext, out MediaType? result));
                 Assert.AreEqual(result!.FullType, type);
                 Assert.IsTrue(result.Extensions.Contains(ext));
             }
         }
     }
-
-    [TestClass]
-    public class UnixMediaTypes : MediaTypesByExtension<UnixMediaTypeResolver>
-    {
-        [TestInitialize]
-        public override void Initialize()
-        {
-            if (OperatingSystem.IsLinux() || OperatingSystem.IsMacOS() || OperatingSystem.IsFreeBSD())
-            {
-                base.Initialize();
-            }
-            else
-            {
-                Assert.Inconclusive("Cannot test this in this platform.");
-            }
-        }
-    }
-
-    [TestClass]
-    public class Win32MediaTypes : MediaTypesByExtension<Win32MediaTypeResolver>
-    {
-        [TestInitialize]
-        public override void Initialize()
-        {
-            if (OperatingSystem.IsWindows())
-            {
-                base.Initialize();
-            }
-            else
-            {
-                Assert.Inconclusive("Cannot test this in this platform.");
-            }
-        }
-    }
 }

ReMime/ContentResolvers/IMagicValueResolver.cs

@@ -0,0 +1,18 @@
+
+using System.Collections.Generic;
+
+namespace ReMime.ContentResolvers
+{
+    public interface IMagicValueResolver
+    {
+        void AddMagicValue(MagicValueMediaType value);
+
+        void AddMagicValues(IEnumerable<MagicValueMediaType> values)
+        {
+            foreach (MagicValueMediaType value in values)
+            {
+                AddMagicValue(value);
+            }
+        }
+    }
+}

ReMime/ContentResolvers/MagEx.cs

@@ -0,0 +1,86 @@
+
+using System;
+
+namespace ReMime.ContentResolvers
+{
+    /* You've heard of regular expressions, now prepare for magical expressions :sparkles:. */
+    /// <summary>
+    /// Bit pattern detecting state machine inspired by text regular expressions.
+    /// </summary>
+    public class MagEx
+    {
+        /**
+         * 0 1 2 3 4 5 6 7 8 9 a b c d e f      4-bit patterns to match.
+         * l h                                  Single bit pattern.
+         * *                                    Any bit pattern.
+         * ?                                    Any 4-bit pattern.
+         * 'pattern'                            ASCII pattern with no terminator. Implies @.
+         * @                                    Align to 8-bits.
+         * %                                    Align to 4-bits.
+         */
+
+        public string Pattern { get; }
+
+        public MagEx(string pattern)
+        {
+            Pattern = pattern;
+        }
+
+        public bool Match(ReadOnlySpan<byte> bytes)
+        {
+            byte current;
+            int needle;
+            int haystack;
+            int bits;
+            int pi = 0;
+            ReadOnlySpan<char> ascii = ReadOnlySpan<char>.Empty;
+            for (int i = 0; i < bytes.Length; i++)
+            {
+                current = bytes[i];
+                bits = 8;
+
+                while (bits > 0)
+                {
+                    char pat = Pattern[pi];
+                    switch (pat)
+                    {
+                    case '0': case '1': case '2': case '3':
+                    case '4': case '5': case '6': case '7':
+                    case '8': case '9': case 'a': case 'A':
+                    case 'b': case 'B': case 'c': case 'C':
+                    case 'd': case 'D': case 'e': case 'E':
+                    case 'f': case 'F':
+                        haystack = current & 0xF;
+                        current >>= 4;
+                        bits -= 4;
+
+                        if (pat >= '0' && pat <= '9')
+                        {
+                            needle = pat - '0';
+                        }
+                        else if (pat >= 'a' && pat <= 'f')
+                        {
+                            needle = pat - 'a';
+                        }
+                        else
+                        {
+                            needle = pat - 'A';
+                        }
+
+                        if (haystack == needle)
+                        {
+                            pi++;
+                        }
+                        else
+                        {
+                            
+                        }
+                        break;
+                    }
+                }
+            }
+
+            return false;
+        }
+    }
+}

ReMime/ContentResolvers/MagicContentResolver.cs

@@ -6,30 +6,28 @@ using System.Linq;
 
 namespace ReMime.ContentResolvers
 {
-    public record MagicValueMediaType(MediaType MediaType, MagicValue[] MagicValues, string[] Extensions);
+    public record MagicValueMediaType(MediaType MediaType, MagicValue[] MagicValues)
+    {
+        public IReadOnlyCollection<string> Extensions { get; } = MediaType.Extensions;
+    }
 
-    public class MagicContentResolver : IMediaContentResolver
+    public class MagicContentResolver : IMediaContentResolver, IMagicValueResolver
     {
         private readonly List<MediaType> _mediaTypes = new List<MediaType>();
         private readonly Dictionary<string, MediaType> _extensions = new Dictionary<string, MediaType>();
         private readonly Tree _tree = new Tree();
         private int _maxBytes = 0;
 
-        public MagicContentResolver(IEnumerable<MagicValueMediaType> values) : this()
+        private MagicContentResolver()
         {
-            AddMagicValues(values);
+            IEnumerable<MagicValueMediaType> entries;
-        }
-
-        public MagicContentResolver()
-        {
-            List<MagicValueDatabaseEntry> entries;
             
             using (Stream str = typeof(MagicContentResolver).Assembly.GetManifestResourceStream("ReMime.ContentResolvers.database.jsonc")!)
             {
                 entries = MagicValueDatabaseEntry.GetEntries(str);
             }
 
-            AddMagicValues(entries.Select(x => (MagicValueMediaType)x));
+            AddMagicValues(entries);
         }
 
         public IReadOnlyCollection<MediaType> MediaTypes => _mediaTypes.AsReadOnly();
@@ -86,6 +84,8 @@ namespace ReMime.ContentResolvers
             return _extensions.TryGetValue(extension, out mediaType);            
         }
 
+        public static MagicContentResolver Instance { get; } = new MagicContentResolver();
+
         private class Tree
         {
             public MagicValueMediaType? Node { get; private set; }

ReMime/ContentResolvers/MagicValueDatabaseEntry.cs

@@ -18,24 +18,24 @@ namespace ReMime.ContentResolvers
         [JsonPropertyName("extensions")]
         public List<string> Extensions { get; set; } = new List<string>();
 
-        public static List<MagicValueDatabaseEntry> GetEntries(Stream str)
+        public static IEnumerable<MagicValueMediaType> GetEntries(Stream str)
         {
             return JsonSerializer.Deserialize<List<MagicValueDatabaseEntry>>(str, new JsonSerializerOptions()
             {
                 AllowTrailingCommas = true,
                 ReadCommentHandling = JsonCommentHandling.Skip
-            }) ?? throw new Exception();
+            })?.Select(x => (MagicValueMediaType)x)
+            ?? throw new Exception();
         }
 
         public static explicit operator MagicValueMediaType(MagicValueDatabaseEntry entry)
         {
             return new MagicValueMediaType(
-                new MediaType(entry.Type),
+                new MediaType(entry.Type, entry.Extensions),
                 entry.Magic.Select(x => (MagicValue.TryParse(x, out var value), value))
                            .Where(x => x.Item1)
                            .Select(x => (MagicValue)x.value!)
-                           .ToArray(),
+                           .ToArray()
-                entry.Extensions.ToArray()
             );
         }
     }

ReMime/ContentResolvers/RiffResolver.cs

@@ -7,7 +7,7 @@ using System.Runtime.InteropServices;
 
 namespace ReMime.ContentResolvers
 {
-    public class RiffResolver : IMediaTypeResolver, IMediaContentResolver
+    public class RiffResolver : IMediaContentResolver, IMagicValueResolver
     {
         public readonly List<MediaType> _mediaTypes = new List<MediaType>();
         public readonly Dictionary<string, MediaType> _extensions = new Dictionary<string, MediaType>();
@@ -15,27 +15,26 @@ namespace ReMime.ContentResolvers
 
         public IReadOnlyCollection<MediaType> MediaTypes { get; }
 
-        public RiffResolver()
+        private RiffResolver()
         {
             MediaTypes = _mediaTypes.AsReadOnly();
 
-            List<MagicValueDatabaseEntry> entries;
+            IEnumerable<MagicValueMediaType> entries;
             
             using (Stream str = typeof(MagicContentResolver).Assembly.GetManifestResourceStream("ReMime.ContentResolvers.riff.jsonc")!)
             {
                 entries = MagicValueDatabaseEntry.GetEntries(str);
             }
 
-            foreach (var entry in entries)
+            AddMagicValues(entries);
-            {
-                AddRiffType((MagicValueMediaType)entry);
-            }
         }
 
-        public RiffResolver(IEnumerable<MagicValueMediaType> values) : this()
+        public void AddMagicValues(IEnumerable<MagicValueMediaType> entries)
         {
-            foreach (MagicValueMediaType value in values)
+            foreach (var entry in entries)
-                AddRiffType(value);
+            {
+                AddMagicValue(entry);
+            }
         }
 
         public bool TryResolve(Stream str, [NotNullWhen(true)] out MediaType? mediaType)
@@ -69,7 +68,7 @@ namespace ReMime.ContentResolvers
         /// Add a RIFF sub-magic value to this resolver.
         /// </summary>
         /// <param name="type"></param>
-        public void AddRiffType(MagicValueMediaType type)
+        public void AddMagicValue(MagicValueMediaType type)
         {
             if (type.MagicValues.Length == 0)
                 throw new ArgumentException("Expected at least one media type.");
@@ -92,6 +91,8 @@ namespace ReMime.ContentResolvers
             }
         }
 
+        public static RiffResolver Instance { get; } = new RiffResolver();
+
         [StructLayout(LayoutKind.Auto, Size = 12)]
         private struct RiffChunk
         {

ReMime/MediaTypeResolver.cs

@@ -50,22 +50,13 @@ namespace ReMime
 
         static MediaTypeResolver()
         {
-            AddResolver(new RiffResolver(), 9997);
+            AddResolver(RiffResolver.Instance, 1000);
-            AddResolver(new MagicContentResolver(), 9998);
+            AddResolver(MagicContentResolver.Instance, 1001);
 
-            if (OperatingSystem.IsWindows())
+            if (Win32MediaTypeResolver.Instance != null)
-            {
+                AddResolver(Win32MediaTypeResolver.Instance, 1002);
-                AddResolver(new Win32MediaTypeResolver());
+            if (UnixMediaTypeResolver.Instance != null)
-            }
+                AddResolver(UnixMediaTypeResolver.Instance, 1002);
-            else if (OperatingSystem.IsLinux())
-            {
-                AddResolver(new UnixMediaTypeResolver());
-                // TODO: add freedesktop mime type database.
-            }
-            else if (OperatingSystem.IsMacOS())
-            {
-                AddResolver(new UnixMediaTypeResolver()); //?
-            }
         }
 
         /// <summary>

ReMime/Platform/UnixMediaTypeResolver.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Collections.Immutable;
+using System.Diagnostics;
 using System.IO;
 
 namespace ReMime.Platform
@@ -13,7 +14,7 @@ namespace ReMime.Platform
         private readonly Dictionary<string, MediaType> _extensionsMap = new Dictionary<string, MediaType>();
         public IReadOnlyCollection<MediaType> MediaTypes { get; }
 
-        public UnixMediaTypeResolver()
+        private UnixMediaTypeResolver()
         {
             {
                 bool valid = OperatingSystem.IsLinux() || OperatingSystem.IsMacOS() || OperatingSystem.IsFreeBSD();
@@ -53,6 +54,20 @@ namespace ReMime.Platform
             return _extensionsMap.TryGetValue(extension, out mediaType);
         }
 
+        public static UnixMediaTypeResolver? Instance { get; } = null;
+
+        static UnixMediaTypeResolver()
+        {
+            try
+            {
+                Instance = new UnixMediaTypeResolver();
+            }
+            catch (Exception ex)
+            {
+                Debug.WriteLine(ex);
+            }
+        }
+
         private static readonly char[] s_delimeters = new char[] { '\t', ' ' };
 
         private static void DigestMimeDatabase(TextReader reader, List<MediaType> types)

ReMime/Platform/Win32MediaTypeResolver.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Linq;
 using Microsoft.Win32;
 
@@ -13,7 +14,7 @@ namespace ReMime.Platform
         private readonly Dictionary<string, MediaType> _extensionsMap = new Dictionary<string, MediaType>();
         public IReadOnlyCollection<MediaType> MediaTypes { get; }
         
-        public Win32MediaTypeResolver()
+        private Win32MediaTypeResolver()
         {
             if (!OperatingSystem.IsWindows())
                 throw new PlatformNotSupportedException();
@@ -57,5 +58,19 @@ namespace ReMime.Platform
         {
             return _extensionsMap.TryGetValue(extension, out mediaType);
         }
+
+        public static Win32MediaTypeResolver? Instance { get; } = null;
+
+        static Win32MediaTypeResolver()
+        {
+            try
+            {
+                Instance = new Win32MediaTypeResolver();
+            }
+            catch (Exception ex)
+            {
+                Debug.WriteLine(ex);
+            }
+        }
     }
 }

ReMime/ReMime.csproj

@@ -8,7 +8,7 @@
     <!--NuGet-->
     <GeneratePackageOnBuild>True</GeneratePackageOnBuild>
     <PackageId>ReFuel.ReMime</PackageId>
-    <Version>0.1.0</Version>
+    <Version>0.1.1</Version>
     <Authors>H. Utku Maden</Authors>
     <Company>ReFuel</Company>
     <PackageReadmeFile>README.md</PackageReadmeFile>