1 files changed, 33 insertions, 0 deletions

diff --git a/packets/header.go b/packets/header.go
new file mode 100644
index 0000000..60cd146
--- /dev/null
+++ b/packets/header.go
@@ -0,0 +1,33 @@
+package packets
+
+import (
+        "fmt"
+
+        "github.com/pektezol/bitreader"
+)
+
+func ParseHeader(reader *bitreader.ReaderType) {
+        header := Header{
+                DemoFileStamp:   reader.TryReadStringLen(8),
+                DemoProtocol:    uint(reader.TryReadInt32()),
+                NetworkProtocol: uint(reader.TryReadInt32()),
+                ServerName:      reader.TryReadStringLen(260),
+                ClientName:      reader.TryReadStringLen(260),
+                MapName:         reader.TryReadStringLen(260),
+                GameDirectory:   reader.TryReadStringLen(260),
+                PlaybackTime:    reader.TryReadFloat32(),
+                PlaybackTicks:   int(reader.TryReadInt32()),
+                PlaybackFrames:  int(reader.TryReadInt32()),
+                SignOnLength:    uint(reader.TryReadInt32()),
+        }
+        if header.DemoFileStamp != "HL2DEMO" {
+                panic("Invalid demo file stamp. Make sure a valid demo file is given.")
+        }
+        if header.DemoProtocol != 4 {
+                panic("Given demo is from old engine. This parser is only supported for new engine.")
+        }
+        if header.NetworkProtocol != 2001 {
+                panic("Given demo is not from Portal2. This parser currently only supports Portal 2.")
+        }
+        fmt.Println(header)
+}