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package dhcpv6
// This module defines the OptClientArchType structure.
// https://www.ietf.org/rfc/rfc5970.txt
import (
"encoding/binary"
"fmt"
"strings"
"github.com/insomniacslk/dhcp/iana"
)
// OptClientArchType represents an option CLIENT_ARCH_TYPE
type OptClientArchType struct {
ArchTypes []iana.ArchType
}
func (op *OptClientArchType) Code() OptionCode {
return OptionClientArchType
}
func (op *OptClientArchType) ToBytes() []byte {
buf := make([]byte, 4)
binary.BigEndian.PutUint16(buf[0:2], uint16(OptionClientArchType))
binary.BigEndian.PutUint16(buf[2:4], uint16(op.Length()))
u16 := make([]byte, 2)
for _, at := range op.ArchTypes {
binary.BigEndian.PutUint16(u16, uint16(at))
buf = append(buf, u16...)
}
return buf
}
func (op *OptClientArchType) Length() int {
return 2*len(op.ArchTypes)
}
func (op *OptClientArchType) String() string {
atStrings := make([]string, 0)
for _, at := range op.ArchTypes {
name := iana.ArchTypeToString(at)
atStrings = append(atStrings, name)
}
return fmt.Sprintf("OptClientArchType{archtype=%v}", strings.Join(atStrings, ", "))
}
// ParseOptClientArchType builds an OptClientArchType structure from
// a sequence of bytes The input data does not include option code and
// length bytes.
func ParseOptClientArchType(data []byte) (*OptClientArchType, error) {
opt := OptClientArchType{}
if len(data) == 0 || len(data)%2 != 0 {
return nil, fmt.Errorf("Invalid arch type data length. Expected multiple of 2 larger than 2, got %v", len(data))
}
for idx := 0; idx < len(data); idx += 2 {
b := data[idx : idx+2]
opt.ArchTypes = append(opt.ArchTypes, iana.ArchType(binary.BigEndian.Uint16(b)))
}
return &opt, nil
}
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