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// Copyright 2014 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
// A DstUnreach represents an ICMP destination unreachable message
// body.
type DstUnreach struct {
Data []byte // data
}
// Len implements the Len method of MessageBody interface.
func (p *DstUnreach) Len() int {
if p == nil {
return 0
}
return 4 + len(p.Data)
}
// Marshal implements the Marshal method of MessageBody interface.
func (p *DstUnreach) Marshal() ([]byte, error) {
b := make([]byte, 4+len(p.Data))
copy(b[4:], p.Data)
return b, nil
}
// parseDstUnreach parses b as an ICMP destination unreachable message
// body.
func parseDstUnreach(b []byte) (MessageBody, error) {
bodyLen := len(b)
if bodyLen < 4 {
return nil, errMessageTooShort
}
p := &DstUnreach{}
if bodyLen > 4 {
p.Data = make([]byte, bodyLen-4)
copy(p.Data, b[4:])
}
return p, nil
}
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