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package dhcpv6
import (
"fmt"
"time"
"github.com/u-root/u-root/pkg/uio"
)
// OptElapsedTime returns an Elapsed Time option as defined by RFC 3315 Section
// 22.9.
func OptElapsedTime(dur time.Duration) Option {
return &optElapsedTime{ElapsedTime: dur}
}
type optElapsedTime struct {
ElapsedTime time.Duration
}
func (*optElapsedTime) Code() OptionCode {
return OptionElapsedTime
}
// ToBytes marshals this option to bytes.
func (op *optElapsedTime) ToBytes() []byte {
buf := uio.NewBigEndianBuffer(nil)
buf.Write16(uint16(op.ElapsedTime.Round(10*time.Millisecond) / (10 * time.Millisecond)))
return buf.Data()
}
func (op *optElapsedTime) String() string {
return fmt.Sprintf("ElapsedTime: %s", op.ElapsedTime)
}
// build an optElapsedTime structure from a sequence of bytes.
// The input data does not include option code and length bytes.
func parseOptElapsedTime(data []byte) (*optElapsedTime, error) {
var opt optElapsedTime
buf := uio.NewBigEndianBuffer(data)
opt.ElapsedTime = time.Duration(buf.Read16()) * 10 * time.Millisecond
return &opt, buf.FinError()
}
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