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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"
)
// 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 {
name := iana.ArchTypeToString(at)
archTypes += name
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) {
if len(data) < 2 {
return nil, ErrShortByteStream
}
code := OptionCode(data[0])
if code != OptionClientSystemArchitectureType {
return nil, fmt.Errorf("expected code %v, got %v", OptionClientSystemArchitectureType, code)
}
length := int(data[1])
if length == 0 || length%2 != 0 {
return nil, fmt.Errorf("Invalid length: expected multiple of 2 larger than 2, got %v", length)
}
if len(data) < 2+length {
return nil, ErrShortByteStream
}
archTypes := make([]iana.ArchType, 0, length%2)
for idx := 0; idx < length; idx += 2 {
b := data[2+idx : 2+idx+2]
archTypes = append(archTypes, iana.ArchType(binary.BigEndian.Uint16(b)))
}
return &OptClientArchType{ArchTypes: archTypes}, nil
}
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