diff --git a/pcap.go b/pcap.go
new file mode 100644
index 0000000..5bc44a6
--- /dev/null
+++ b/pcap.go
@@ -0,0 +1,77 @@
+package main
+//package pcap
+
+import (
+	"time"
+	"os"
+	"fmt"
+	"io"
+	"encoding/binary"
+)
+
+const MAGIC = 0xa1b2c3d4
+const MAXFRAME = 9000
+
+const LINKTYPE_ETHERNET = 1
+const LINKTYPE_RAW = 101
+
+type Frame struct {
+	ts time.Time
+	caplen uint32
+	framelen uint32
+	payload string
+}
+
+type FileHeader struct {
+	VersionMajor uint16
+	VersionMinor uint16
+	ThisZone int32
+	SigFigs uint32
+	SnapLen int32
+	LinkType int32
+}
+
+type PcapFile struct {
+	order binary.ByteOrder
+	header FileHeader
+}
+
+type Reader struct {
+	PcapFile
+	r io.Reader
+}
+
+type Writer struct {
+	PcapFile
+	w io.Writer
+}
+
+func NewReader(r io.Reader) (*Reader, error) {
+	var h FileHeader
+	var magic uint32
+	var order binary.ByteOrder = binary.BigEndian
+
+	if err := binary.Read(r, order, &magic); err != nil {
+		return nil, err
+	}
+	if magic != MAGIC {
+		order = binary.LittleEndian
+	}
+
+	if err := binary.Read(r, order, &h); err != nil {
+		return nil, err
+	}
+
+	ret := &Reader{PcapFile{order, h}, r}
+
+	return ret, nil
+}
+
+func main() {
+	r, err := NewReader(os.Stdin)
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println(r.order, r.header)
+}