From 82871ba1bac1d62f69e1933b66659e62d2e5e063 Mon Sep 17 00:00:00 2001
From: Arda Serdar Pektezol <1669855+pektezol@users.noreply.github.com>
Date: Tue, 12 Sep 2023 20:53:09 +0300
Subject: another rewrite, v1.0.0

---
 pkg/packets/headers.go | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 pkg/packets/headers.go

(limited to 'pkg/packets/headers.go')

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
+}
-- 
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