Implement scr parsing

ParkanPlayground/Extensions.cs

@@ -0,0 +1,39 @@
+using System.Buffers.Binary;
+using System.Text;
+
+namespace ParkanPlayground;
+
+public static class Extensions
+{
+    public static int ReadInt32LittleEndian(this FileStream fs)
+    {
+        Span<byte> buf = stackalloc byte[4];
+        fs.ReadExactly(buf);
+
+        return BinaryPrimitives.ReadInt32LittleEndian(buf);
+    }
+
+    public static float ReadFloatLittleEndian(this FileStream fs)
+    {
+        Span<byte> buf = stackalloc byte[4];
+        fs.ReadExactly(buf);
+
+        return BinaryPrimitives.ReadSingleLittleEndian(buf);
+    }
+
+    public static string ReadLengthPrefixedString(this FileStream fs)
+    {
+        var len = fs.ReadInt32LittleEndian();
+
+        if (len == 0)
+        {
+            return "";
+        }
+
+        var buffer = new byte[len];
+
+        fs.ReadExactly(buffer, 0, len);
+
+        return Encoding.ASCII.GetString(buffer, 0, len);
+    }
+}