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package dhcpv4
import (
"fmt"
"strings"
"github.com/u-root/u-root/pkg/uio"
)
// This option implements the parameter request list option
// https://tools.ietf.org/html/rfc2132
// OptParameterRequestList represents the parameter request list option.
type OptParameterRequestList struct {
RequestedOpts []OptionCode
}
// ParseOptParameterRequestList returns a new OptParameterRequestList from a
// byte stream, or error if any.
func ParseOptParameterRequestList(data []byte) (*OptParameterRequestList, error) {
buf := uio.NewBigEndianBuffer(data)
requestedOpts := make([]OptionCode, 0, buf.Len())
for buf.Len() > 0 {
requestedOpts = append(requestedOpts, OptionCode(buf.Read8()))
}
return &OptParameterRequestList{RequestedOpts: requestedOpts}, buf.Error()
}
// Code returns the option code.
func (o *OptParameterRequestList) Code() OptionCode {
return OptionParameterRequestList
}
// ToBytes returns a serialized stream of bytes for this option.
func (o *OptParameterRequestList) ToBytes() []byte {
ret := []byte{byte(o.Code()), byte(o.Length())}
for _, req := range o.RequestedOpts {
ret = append(ret, byte(req))
}
return ret
}
// String returns a human-readable string for this option.
func (o *OptParameterRequestList) String() string {
var optNames []string
for _, ro := range o.RequestedOpts {
name := ro.String()
if name == "Unknown" {
name += fmt.Sprintf("%s (%v)", name, ro)
}
optNames = append(optNames, name)
}
return fmt.Sprintf("Parameter Request List -> [%v]", strings.Join(optNames, ", "))
}
// Length returns the length of the data portion (excluding option code and byte
// for length, if any).
func (o *OptParameterRequestList) Length() int {
return len(o.RequestedOpts)
}
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