bring in khatru and eventstore.

eventstore/mmm/position.go

@@ -0,0 +1,27 @@
+package mmm
+
+import (
+	"encoding/binary"
+	"fmt"
+)
+
+type position struct {
+	start uint64
+	size  uint32
+}
+
+func (pos position) String() string {
+	return fmt.Sprintf("<%d|%d|%d>", pos.start, pos.size, pos.start+uint64(pos.size))
+}
+
+func positionFromBytes(posb []byte) position {
+	return position{
+		size:  binary.BigEndian.Uint32(posb[0:4]),
+		start: binary.BigEndian.Uint64(posb[4:12]),
+	}
+}
+
+func bytesFromPosition(out []byte, pos position) {
+	binary.BigEndian.PutUint32(out[0:4], pos.size)
+	binary.BigEndian.PutUint64(out[4:12], pos.start)
+}