Header parsing

readme.md

@@ -22,3 +22,8 @@ Analysis of TF2 Demo files. To help me get more _data driven_ approaches to get
 Parsing the demo files. Hopefully once, maybe multiple times.
 
 Only intrested after the start of the official match. Warmup should not count.
+
+
+Big up for (DemoInfo)[https://github.com/StatsHelix/demoinfo/tree/master/DemoInfo] for providing some inspiration
+
+And thanks to the lads at (demostf)[https://github.com/demostf/parser] for TF2 specific code

src/Program.cs

@@ -1,2 +1,112 @@
 // See https://aka.ms/new-console-template for more information
+using System.Text;
+using DemoParser;
+
 Console.WriteLine("Hello, World!");
+//TODO: Config
+const string _DemoPath = "/home/sherwood/projects/tf2DemoAnalysis/demos/";
+
+var demoFilePaths = Directory.GetFiles(_DemoPath, "*.dem");
+
+foreach(var currentDemoPath in demoFilePaths){
+    var demo = File.OpenRead(Path.Combine(_DemoPath, currentDemoPath));
+
+    var info = DemoParsing.ReadDemoHeader(demo);
+    Console.WriteLine($"{currentDemoPath}: Header parsed ");
+}
+
+
+
+
+
+
+namespace DemoParser{
+
+    public record demoHeader(
+        int demoProtocol,
+        int networkProtocol,
+        string ServerName,
+        string ClientName,
+        string MapName,
+        string GameDirectory,
+        float playbackTime,
+        int Ticks,
+        int Frames,
+        int SignOnLength
+    );
+
+    public class DemoParsing{
+        public static demoHeader ReadDemoHeader(FileStream stream){
+            // 8 chars
+            // int
+            // int
+            // 260 chars
+            // 260 chars
+            // 260 chars
+            // 260 chars
+            //float
+            //int
+            //int
+            //int
+
+            //Read the header.
+
+
+            // If the first 8 chars are not "HL2DEMO" then it is not valid.
+            var buffer = new Byte[8];
+            stream.Read(buffer, 0, 8);
+
+            if(Encoding.ASCII.GetString(buffer) != "HL2DEMO\0"){
+                throw new Exception($"DemoFile not valid! Filestamp: {Encoding.ASCII.GetString(buffer)}");
+            }
+
+            return new demoHeader(
+                readInt(stream),
+                readInt(stream),
+                readString(stream, 260, Encoding.ASCII),
+                readString(stream, 260, Encoding.ASCII),
+                readString(stream, 260, Encoding.ASCII),
+                readString(stream, 260, Encoding.ASCII),
+                readFloat(stream),
+                readInt(stream),
+                readInt(stream),
+                readInt(stream)
+            );
+
+            
+        }
+
+        public static int readInt(FileStream stream, int offset = 0){
+            var buffer = new Byte[4];
+            stream.Read(buffer, offset, 4);
+            return BitConverter.ToInt32(buffer,0);
+        }
+
+        public static float readFloat(FileStream stream, int offset = 0){
+            var buffer = new Byte[4];
+            stream.Read(buffer, offset, 4);
+            return BitConverter.ToSingle(buffer,0);
+        }
+
+        //Reads until end of string
+        public static string readString(FileStream stream, int maxLength, Encoding encoding,int offset = 0){
+            var buffer = new Byte[maxLength];
+            var readBytes = stream.Read(buffer, offset, maxLength);
+
+            var readString = encoding.GetString(buffer).Split('\0')[0];
+
+            return readString;
+
+        }
+
+
+    }
+
+    // static class helper{
+
+    //     public static string ReadCString(this BinaryReader reader, int length, Encoding encoding)
+	// 	{
+	// 		return encoding.GetString(reader.ReadBytes(length)).Split(new char[] { '\0' }, 2)[0];  
+	// 	}
+    // }
+}