I dunno man

fxl.codes.kisekae.data.test/BitStreamTests.cs

@@ -39,7 +39,7 @@ public class BitStreamTests
     }
 
     [Test]
-    public void TestReadLong()
+    public void TestReadInt()
     {
         var random = (uint)Random.Shared.Next();
         var bytes = BitConverter.GetBytes(random);

fxl.codes.kisekae.data.test/LZWTests.cs

@@ -1,4 +1,3 @@
-using fxl.codes.kisekae.data.Archives;
 using fxl.codes.kisekae.data.Archives.Algorithms;
 
 namespace fxl.codes.kisekae.data.test;
@@ -20,30 +19,10 @@ public class LZWTests
     {
         Assert.Multiple(() =>
         {
-            Assert.That(_lzw.Encode(_unencoded), Is.EqualTo(_encoded), "Encoding failed");
+            var streamUnencoded = new MemoryStream(_unencoded);
-            Assert.That(_lzw.Decode(_encoded), Is.EqualTo(_unencoded), "Decoding failed");
+            var streamEncoded = new MemoryStream(_encoded);
-        });
+            Assert.That(_lzw.Encode(streamUnencoded), Is.EqualTo(_encoded), "Encoding failed");
-    }
+            Assert.That(_lzw.Decode(streamEncoded), Is.EqualTo(_unencoded), "Decoding failed");
-
-    [Test]
-    public void TestDecompressLzh()
-    {
-        var assembly = typeof(LZWTests).Assembly;
-        foreach (var resource in assembly.GetManifestResourceNames())
-        {
-            using var stream = assembly.GetManifestResourceStream(resource);
-            if (stream == null) continue;
-
-            var files = LhCodecService.GetFiles(in stream);
-            foreach (var file in files)
-                Assert.Multiple(() =>
-                {
-                    Assert.That(file.CompressedFile, Is.Not.Null);
-                    Assert.That(file.CompressedFile, Is.Not.Empty);
-
-                    var decompressed = _lzw.Decode(file.CompressedFile);
-                    Assert.That(decompressed, Is.Not.Null);
         });
     }
 }
-}

fxl.codes.kisekae.data/Archives/Algorithms/Huffman.cs

@@ -0,0 +1,47 @@
+namespace fxl.codes.kisekae.data.Archives.Algorithms;
+
+public class Huffman
+{
+    private readonly List<HuffmanNode> Nodes;
+
+    public Huffman()
+    {
+        Nodes = new List<HuffmanNode>();
+        for (var i = char.MinValue; i < char.MaxValue; i++) Nodes.Add(new HuffmanNode(i, 1));
+    }
+}
+
+internal class HuffmanNode
+{
+    public readonly char Value;
+    public HuffmanNode Left;
+    public HuffmanNode Parent;
+    public HuffmanNode Right;
+    public HuffmanSide Side;
+    public int Weight;
+
+    public HuffmanNode(char value, int weight = 0)
+    {
+        Value = value;
+        Weight = weight;
+    }
+
+    public HuffmanNode(HuffmanNode left, HuffmanNode right)
+    {
+        Left = left;
+        Left.Side = HuffmanSide.Left;
+        Left.Parent = this;
+
+        Right = right;
+        Right.Side = HuffmanSide.Right;
+        Right.Parent = this;
+
+        Weight = left.Weight + right.Weight;
+    }
+}
+
+internal enum HuffmanSide
+{
+    Left,
+    Right
+}

fxl.codes.kisekae.data/Archives/Algorithms/IAlgorithm.cs

@@ -2,6 +2,6 @@ namespace fxl.codes.kisekae.data.Archives.Algorithms;
 
 public interface IAlgorithm
 {
-    byte[] Encode(ReadOnlySpan<byte> stream);
+    byte[] Encode(Stream stream);
-    byte[] Decode(ReadOnlySpan<byte> stream);
+    byte[] Decode(Stream stream, int bitLength);
 }

fxl.codes.kisekae.data/Archives/Algorithms/LZW.cs

@@ -4,24 +4,38 @@ namespace fxl.codes.kisekae.data.Archives.Algorithms;
 
 internal class LZW : IAlgorithm
 {
+    private static readonly Dictionary<uint, string> DecodeDictionary;
+    private static readonly Dictionary<string, uint> EncodeDictionary;
     private readonly int Max;
 
+    static LZW()
+    {
+        DecodeDictionary = new Dictionary<uint, string>();
+        EncodeDictionary = new Dictionary<string, uint>();
+
+        for (uint i = 0; i <= byte.MaxValue; i++)
+        {
+            var value = $"{(char)i}";
+            DecodeDictionary.Add(i, value);
+            EncodeDictionary.Add(value, i);
+        }
+    }
+
     internal LZW(int max = short.MaxValue)
     {
         Max = max;
     }
 
-    public byte[] Decode(ReadOnlySpan<byte> stream)
+    public byte[] Decode(Stream stream, int bitLength = 32)
     {
+        var dictionary = DecodeDictionary.ToDictionary(x => x.Key, x => x.Value);
         uint next = byte.MaxValue + 1;
-        var dictionary = new Dictionary<uint, string>();
-        for (uint i = 0; i <= byte.MaxValue; i++) dictionary.Add(i, $"{(char)i}");
-
         var buffer = "";
         var decoded = new List<string>();
-        for (var i = 0; i < stream.Length; i += 4)
+        var bitStream = new BitStream(stream);
+        while (bitStream.Position < bitStream.Length)
         {
-            var code = BitConverter.ToUInt32(stream[i..(i + 4)]);
+            var code = bitStream.ReadBits(bitLength);
             if (!dictionary.ContainsKey(code)) dictionary[code] = buffer + buffer[0];
 
             decoded.Add(dictionary[code]);
@@ -33,17 +47,18 @@ internal class LZW : IAlgorithm
         return decoded.SelectMany(Encoding.UTF8.GetBytes).ToArray();
     }
 
-    public byte[] Encode(ReadOnlySpan<byte> stream)
+    public byte[] Encode(Stream stream)
     {
-        var next = byte.MaxValue + 1;
+        uint next = byte.MaxValue + 1;
-        var dictionary = new Dictionary<string, int>();
+        var dictionary = EncodeDictionary.ToDictionary(x => x.Key, x => x.Value);
-        for (var i = 0; i <= byte.MaxValue; i++) dictionary.Add($"{(char)i}", i);
 
         var buffer = "";
-        var encoded = new List<int>();
+        var encoded = new List<uint>();
-        foreach (var part in stream)
+        while (true)
         {
-            var charValue = (char)part;
+            if (stream.Position >= stream.Length) break;
+
+            var charValue = (char)stream.ReadByte();
             buffer += charValue;
             if (dictionary.ContainsKey(buffer)) continue;
             if (next <= Max) dictionary.Add(buffer, next++);

fxl.codes.kisekae.data/Archives/BitStream.cs

@@ -41,17 +41,27 @@ public class BitStream : Stream
             }
 
         var buffer = _bitBuffer;
+        if (bitLength < 32)
+        {
             buffer >>= 32 - bitLength;
-#if DEBUG
-        Console.WriteLine($"BitStream buffer: {_bitBuffer:b}, extracted number: {buffer:b}");
-#endif
             _bitBuffer <<= bitLength;
+        }
+        else
+        {
+            _bitBuffer = 0;
+        }
+
         Position += bitLength;
         _bitBufferCount -= bitLength;
 
         return buffer;
     }
 
+    public override int ReadByte()
+    {
+        return (int)ReadBits(8);
+    }
+
     public override void Flush()
     {
         throw new NotImplementedException();