First commit

This project shall offer a iRacing telemetry parser with as little
dependencies as possible

diskSubHeader.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+)
+
+const (
+	SubHeaderSize = 32 // SubHeaderSize is the size of the subheader
+)
+
+// DiskSubHeader represents the IBT sub headers
+type DiskSubHeader struct {
+	StartDate   float64 // StartDate represents the start data of the telemetry
+	StartTime   float64 // StartTime ...
+	EndTime     float64 // EndTime ...
+	LapCount    int32   // LapCount represents the total number laps
+	RecordCount int32   // RecordCount ...
+}
+
+// parseTelemetrySubHeader will return a pointer to a DiskSubHeader variable
+// or nil if an error occurs. In which case the error return value is more
+// valuable
+func parseTelemetrySubHeader(buf [SubHeaderSize]byte) (*DiskSubHeader, error) {
+	dst := DiskSubHeader{}
+	err := binary.Read(bytes.NewBuffer(buf[:]), binary.LittleEndian, &dst)
+	if err != nil {
+		return nil, err
+	}
+
+	return &dst, nil
+}
+
+// ToString renders a string showing the values of the struct
+func (d *DiskSubHeader) ToString() string {
+  return fmt.Sprintf(
+    "StartDate:   %13f (0x%04x)\n" +
+    "StartTime:   %13f (0x%08x)\n" +
+    "EndTime:     %13f (0x%08x)\n" +
+    "LapCount:    %13d (0x%04x)\n" +
+    "RecordCount: %13d (0x%04x)\n",
+    d.StartDate, d.StartDate, d.StartTime, d.StartTime,
+    d.EndTime, d.EndTime, d.LapCount, d.LapCount,
+    d.RecordCount, d.RecordCount,
+  )
+}