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package bsdp
import (
"encoding/binary"
"fmt"
"github.com/insomniacslk/dhcp/dhcpv4"
)
// This option implements the server identifier option
// https://tools.ietf.org/html/rfc2132
// OptServerPriority represents an option encapsulating the server priority.
type OptServerPriority struct {
Priority int
}
// ParseOptServerPriority returns a new OptServerPriority from a byte stream, or
// error if any.
func ParseOptServerPriority(data []byte) (*OptServerPriority, error) {
if len(data) < 4 {
return nil, dhcpv4.ErrShortByteStream
}
code := dhcpv4.OptionCode(data[0])
if code != OptionServerPriority {
return nil, fmt.Errorf("expected code %v, got %v", OptionServerPriority, code)
}
length := int(data[1])
if length != 2 {
return nil, fmt.Errorf("unexpected length: expected 2, got %v", length)
}
return &OptServerPriority{Priority: int(binary.BigEndian.Uint16(data[2:4]))}, nil
}
// Code returns the option code.
func (o *OptServerPriority) Code() dhcpv4.OptionCode {
return OptionServerPriority
}
// ToBytes returns a serialized stream of bytes for this option.
func (o *OptServerPriority) ToBytes() []byte {
serialized := make([]byte, 2)
binary.BigEndian.PutUint16(serialized, uint16(o.Priority))
return append([]byte{byte(o.Code()), byte(o.Length())}, serialized...)
}
// String returns a human-readable string.
func (o *OptServerPriority) String() string {
return fmt.Sprintf("BSDP Server Priority -> %v", o.Priority)
}
// Length returns the length of the data portion (excluding option code an byte
// length).
func (o *OptServerPriority) Length() int {
return 2
}
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