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package dhcpv4
import (
"fmt"
)
// This option implements the Class Identifier option
// https://tools.ietf.org/html/rfc2132
// OptClassIdentifier represents the DHCP message type option.
type OptClassIdentifier struct {
Identifier string
}
// ParseOptClassIdentifier constructs an OptClassIdentifier struct from a sequence of
// bytes and returns it, or an error.
func ParseOptClassIdentifier(data []byte) (*OptClassIdentifier, error) {
// Should at least have code and length
if len(data) < 2 {
return nil, ErrShortByteStream
}
code := OptionCode(data[0])
if code != OptionClassIdentifier {
return nil, fmt.Errorf("expected option %v, got %v instead", OptionClassIdentifier, code)
}
length := int(data[1])
if len(data) < 2+length {
return nil, ErrShortByteStream
}
return &OptClassIdentifier{Identifier: string(data[2 : 2+length])}, nil
}
// Code returns the option code.
func (o *OptClassIdentifier) Code() OptionCode {
return OptionClassIdentifier
}
// ToBytes returns a serialized stream of bytes for this option.
func (o *OptClassIdentifier) ToBytes() []byte {
return append([]byte{byte(o.Code()), byte(o.Length())}, []byte(o.Identifier)...)
}
// String returns a human-readable string for this option.
func (o *OptClassIdentifier) String() string {
return fmt.Sprintf("Class Identifier -> %v", o.Identifier)
}
// Length returns the length of the data portion (excluding option code and byte
// for length, if any).
func (o *OptClassIdentifier) Length() int {
return len(o.Identifier)
}
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