1 files changed, 48 insertions, 0 deletions

diff --git a/pkg/packets/headers.go b/pkg/packets/headers.go
new file mode 100644
index 0000000..543476b
--- /dev/null
+++ b/pkg/packets/headers.go
@@ -0,0 +1,48 @@
+package packets
+
+import (
+        "fmt"
+
+        "github.com/pektezol/bitreader"
+)
+
+type Headers struct {
+        DemoFileStamp   string
+        DemoProtocol    int32
+        NetworkProtocol int32
+        ServerName      string
+        ClientName      string
+        MapName         string
+        GameDirectory   string
+        PlaybackTime    float32
+        PlaybackTicks   int32
+        PlaybackFrames  int32
+        SignOnLength    int32
+}
+
+func ParseHeaders(reader *bitreader.ReaderType) Headers {
+        headers := Headers{
+                DemoFileStamp:   reader.TryReadString(),
+                DemoProtocol:    int32(reader.TryReadInt32()),
+                NetworkProtocol: int32(reader.TryReadInt32()),
+                ServerName:      reader.TryReadStringLen(260),
+                ClientName:      reader.TryReadStringLen(260),
+                MapName:         reader.TryReadStringLen(260),
+                GameDirectory:   reader.TryReadStringLen(260),
+                PlaybackTime:    reader.TryReadFloat32(),
+                PlaybackTicks:   int32(reader.TryReadInt32()),
+                PlaybackFrames:  int32(reader.TryReadInt32()),
+                SignOnLength:    int32(reader.TryReadInt32()),
+        }
+        if headers.DemoFileStamp != "HL2DEMO" {
+                panic("invalid demo file stamp")
+        }
+        if headers.DemoProtocol != 4 {
+                panic("this parser only supports demos from new engine")
+        }
+        if headers.NetworkProtocol != 2001 {
+                panic("this parser only supports demos from portal 2")
+        }
+        fmt.Printf("Headers: %+v\n", headers)
+        return headers
+}