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package sctp
import (
"encoding/binary"
)
// errorCauseHeader represents the shared header that is shared by all error causes
type errorCauseHeader struct {
code errorCauseCode
len uint16
raw []byte
}
const (
errorCauseHeaderLength = 4
)
func (e *errorCauseHeader) marshal() ([]byte, error) {
e.len = uint16(len(e.raw)) + uint16(errorCauseHeaderLength)
raw := make([]byte, e.len)
binary.BigEndian.PutUint16(raw[0:], uint16(e.code))
binary.BigEndian.PutUint16(raw[2:], e.len)
copy(raw[errorCauseHeaderLength:], e.raw)
return raw, nil
}
func (e *errorCauseHeader) unmarshal(raw []byte) error {
e.code = errorCauseCode(binary.BigEndian.Uint16(raw[0:]))
e.len = binary.BigEndian.Uint16(raw[2:])
valueLength := e.len - errorCauseHeaderLength
e.raw = raw[errorCauseHeaderLength : errorCauseHeaderLength+valueLength]
return nil
}
func (e *errorCauseHeader) length() uint16 {
return e.len
}
func (e *errorCauseHeader) errorCauseCode() errorCauseCode {
return e.code
}
// String makes errorCauseHeader printable
func (e errorCauseHeader) String() string {
return e.code.String()
}
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