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[bytom/vapor.git] / vendor / golang.org / x / net / icmp / echo.go

diff --git a/vendor/golang.org/x/net/icmp/echo.go b/vendor/golang.org/x/net/icmp/echo.go
new file mode 100644 (file)
index 0000000..e6f15ef
--- /dev/null
+++ b/vendor/golang.org/x/net/icmp/echo.go
@@ -0,0 +1,45 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package icmp
+
+import "encoding/binary"
+
+// An Echo represents an ICMP echo request or reply message body.
+type Echo struct {
+       ID   int    // identifier
+       Seq  int    // sequence number
+       Data []byte // data
+}
+
+// Len implements the Len method of MessageBody interface.
+func (p *Echo) Len(proto int) int {
+       if p == nil {
+               return 0
+       }
+       return 4 + len(p.Data)
+}
+
+// Marshal implements the Marshal method of MessageBody interface.
+func (p *Echo) Marshal(proto int) ([]byte, error) {
+       b := make([]byte, 4+len(p.Data))
+       binary.BigEndian.PutUint16(b[:2], uint16(p.ID))
+       binary.BigEndian.PutUint16(b[2:4], uint16(p.Seq))
+       copy(b[4:], p.Data)
+       return b, nil
+}
+
+// parseEcho parses b as an ICMP echo request or reply message body.
+func parseEcho(proto int, b []byte) (MessageBody, error) {
+       bodyLen := len(b)
+       if bodyLen < 4 {
+               return nil, errMessageTooShort
+       }
+       p := &Echo{ID: int(binary.BigEndian.Uint16(b[:2])), Seq: int(binary.BigEndian.Uint16(b[2:4]))}
+       if bodyLen > 4 {
+               p.Data = make([]byte, bodyLen-4)
+               copy(p.Data, b[4:])
+       }
+       return p, nil
+}