I'm pretending that I know what I'm doing

2024-09-21 22:40:15 -06:00
parent 87d60b6918
commit 2054009b97
10 changed files with 193 additions and 32 deletions
@@ -0,0 +1,34 @@
+using System.Text;
+
+namespace fxl.codes.kisekae.data.Archives;
+
+public class LzhExtractor
+{
+    public async void Open(Stream stream, string filename)
+    {
+        var headerSize = stream.ReadByte();
+        var headerSum = stream.ReadByte();
+        var methodBytes = new byte[5];
+        await stream.ReadExactlyAsync(methodBytes);
+
+        var method = Encoding.ASCII.GetString(methodBytes);
+        var skipSize = await ReadLittleEndian(stream);
+        var origSize = await ReadLittleEndian(stream);
+        var time = await ReadLittleEndian(stream);
+        var attribute = stream.ReadByte();
+        var level = stream.ReadByte();
+    }
+
+    private static async Task<int> ReadLittleEndian(Stream stream, int length = 4)
+    {
+        var buffer = new byte[length];
+        await stream.ReadExactlyAsync(buffer);
+        var x = BitConverter.ToInt32(buffer);
+
+        var b0 = (x >> 24) & 255;
+        var b1 = (x >> 16) & 255;
+        var b2 = (x >> 8) & 255;
+        var b3 = (x >> 0) & 255;
+        return (b0 << 0) + (b1 << 8) + (b2 << 16) + (b3 << 24);
+    }
+}