github.com/hxx258456/ccgo@v0.0.5-0.20230213014102-48b35f46f66f/net/icmp/messagebody.go (about)

     1  // Copyright 2012 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package icmp
     6  
     7  // A MessageBody represents an ICMP message body.
     8  type MessageBody interface {
     9  	// Len returns the length of ICMP message body.
    10  	// The provided proto must be either the ICMPv4 or ICMPv6
    11  	// protocol number.
    12  	Len(proto int) int
    13  
    14  	// Marshal returns the binary encoding of ICMP message body.
    15  	// The provided proto must be either the ICMPv4 or ICMPv6
    16  	// protocol number.
    17  	Marshal(proto int) ([]byte, error)
    18  }
    19  
    20  // A RawBody represents a raw message body.
    21  //
    22  // A raw message body is excluded from message processing and can be
    23  // used to construct applications such as protocol conformance
    24  // testing.
    25  type RawBody struct {
    26  	Data []byte // data
    27  }
    28  
    29  // Len implements the Len method of MessageBody interface.
    30  func (p *RawBody) Len(proto int) int {
    31  	if p == nil {
    32  		return 0
    33  	}
    34  	return len(p.Data)
    35  }
    36  
    37  // Marshal implements the Marshal method of MessageBody interface.
    38  func (p *RawBody) Marshal(proto int) ([]byte, error) {
    39  	return p.Data, nil
    40  }
    41  
    42  // parseRawBody parses b as an ICMP message body.
    43  func parseRawBody(proto int, b []byte) (MessageBody, error) {
    44  	p := &RawBody{Data: make([]byte, len(b))}
    45  	copy(p.Data, b)
    46  	return p, nil
    47  }
    48  
    49  // A DefaultMessageBody represents the default message body.
    50  //
    51  // Deprecated: Use RawBody instead.
    52  type DefaultMessageBody = RawBody