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package bsdp
import (
"fmt"
"github.com/insomniacslk/dhcp/dhcpv4"
)
// OptGeneric is an option that only contains the option code and associated
// data. Every option that does not have a specific implementation will fall
// back to this option.
type OptGeneric struct {
OptionCode dhcpv4.OptionCode
Data []byte
}
// ParseOptGeneric parses a bytestream and creates a new OptGeneric from it,
// or an error.
func ParseOptGeneric(data []byte) (*OptGeneric, error) {
if len(data) == 0 {
return nil, dhcpv4.ErrZeroLengthByteStream
}
var (
length int
optionData []byte
)
code := dhcpv4.OptionCode(data[0])
length = int(data[1])
if len(data) < length+2 {
return nil, fmt.Errorf("invalid data length: declared %v, actual %v", length, len(data))
}
optionData = data[2 : length+2]
return &OptGeneric{OptionCode: code, Data: optionData}, nil
}
// Code returns the generic option code.
func (o OptGeneric) Code() dhcpv4.OptionCode {
return o.OptionCode
}
// ToBytes returns a serialized generic option as a slice of bytes.
func (o OptGeneric) ToBytes() []byte {
return append([]byte{byte(o.Code()), byte(o.Length())}, o.Data...)
}
// String returns a human-readable representation of a generic option.
func (o OptGeneric) String() string {
code, ok := OptionCodeToString[o.Code()]
if !ok {
code = "Unknown"
}
return fmt.Sprintf("%v -> %v", code, o.Data)
}
// Length returns the number of bytes comprising the data section of the option.
func (o OptGeneric) Length() int {
return len(o.Data)
}
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