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package dhcpv4
import (
"fmt"
)
// This option implements the Bootfile name Option.
// https://tools.ietf.org/html/rfc2132
// OptBootfileName implements the BootFile Name option
type OptBootfileName struct {
BootfileName []byte
}
// Code returns the option code
func (op *OptBootfileName) Code() OptionCode {
return OptionBootfileName
}
// ToBytes serializes the option and returns it as a sequence of bytes
func (op *OptBootfileName) ToBytes() []byte {
return append([]byte{byte(op.Code()), byte(op.Length())}, op.BootfileName...)
}
// Length returns the option length in bytes
func (op *OptBootfileName) Length() int {
return len(op.BootfileName)
}
func (op *OptBootfileName) String() string {
return fmt.Sprintf("Bootfile Name -> %s", op.BootfileName)
}
// ParseOptBootfileName returns a new OptBootfile from a byte stream or error if any
func ParseOptBootfileName(data []byte) (*OptBootfileName, error) {
if len(data) < 3 {
return nil, ErrShortByteStream
}
code := OptionCode(data[0])
if code != OptionBootfileName {
return nil, fmt.Errorf("ParseOptBootfileName: invalid code: %v; want %v", code, OptionBootfileName)
}
length := int(data[1])
if length < 1 {
return nil, fmt.Errorf("Bootfile name has invalid length of %d", length)
}
bootFileNameData := data[2:]
if len(bootFileNameData) < length {
return nil, fmt.Errorf("ParseOptBootfileName: short data: %d bytes; want %d",
len(bootFileNameData), length)
}
return &OptBootfileName{BootfileName: bootFileNameData[:length]}, nil
}
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