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package dhcpv4
// This option implements the Client System Architecture Type option
// https://tools.ietf.org/html/rfc4578
import (
"encoding/binary"
"fmt"
"github.com/insomniacslk/dhcp/iana"
"github.com/u-root/u-root/pkg/uio"
)
// OptClientArchType represents an option encapsulating the Client System
// Architecture Type option Definition.
type OptClientArchType struct {
ArchTypes []iana.ArchType
}
// Code returns the option code.
func (o *OptClientArchType) Code() OptionCode {
return OptionClientSystemArchitectureType
}
// ToBytes returns a serialized stream of bytes for this option.
func (o *OptClientArchType) ToBytes() []byte {
ret := []byte{byte(o.Code()), byte(o.Length())}
for _, at := range o.ArchTypes {
buf := make([]byte, 2)
binary.BigEndian.PutUint16(buf[0:2], uint16(at))
ret = append(ret, buf...)
}
return ret
}
// Length returns the length of the data portion (excluding option code an byte
// length).
func (o *OptClientArchType) Length() int {
return 2 * len(o.ArchTypes)
}
// String returns a human-readable string.
func (o *OptClientArchType) String() string {
var archTypes string
for idx, at := range o.ArchTypes {
archTypes += at.String()
if idx < len(o.ArchTypes)-1 {
archTypes += ", "
}
}
return fmt.Sprintf("Client System Architecture Type -> %v", archTypes)
}
// ParseOptClientArchType returns a new OptClientArchType from a byte stream,
// or error if any.
func ParseOptClientArchType(data []byte) (*OptClientArchType, error) {
buf := uio.NewBigEndianBuffer(data)
if buf.Len() == 0 {
return nil, fmt.Errorf("must have at least one archtype if option is present")
}
archTypes := make([]iana.ArchType, 0, buf.Len()/2)
for buf.Has(2) {
archTypes = append(archTypes, iana.ArchType(buf.Read16()))
}
return &OptClientArchType{ArchTypes: archTypes}, buf.FinError()
}
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