/
HeaderEnrichment.go
90 lines (74 loc) · 2.31 KB
/
HeaderEnrichment.go
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package pfcpType
import (
"fmt"
"math/bits"
)
type HeaderEnrichment struct {
HeaderType uint8 // 0x00011111
LengthOfHeaderFieldName uint8
HeaderFieldName []byte
LengthOfHeaderFieldValue uint8
HeaderFieldValue []byte
}
func (h *HeaderEnrichment) MarshalBinary() (data []byte, err error) {
// Octet 5
if bits.Len8(h.HeaderType) > 5 {
return []byte(""), fmt.Errorf("Header type shall not be greater than 5 bits binary integer")
}
data = append([]byte(""), h.HeaderType)
// Octet 6
data = append(data, h.LengthOfHeaderFieldName)
// Octet 7 to m
if len(h.HeaderFieldName) != int(h.LengthOfHeaderFieldName) {
return []byte(""), fmt.Errorf("Unmatch length of header field name: Expect %d, got %d",
h.LengthOfHeaderFieldName, len(h.HeaderFieldName))
}
data = append(data, h.HeaderFieldName...)
// Octet p
data = append(data, h.LengthOfHeaderFieldValue)
// Octet (p+1) to q
if len(h.HeaderFieldValue) != int(h.LengthOfHeaderFieldValue) {
return []byte(""), fmt.Errorf("Unmatch length of header field name: Expect %d, got %d",
h.LengthOfHeaderFieldValue, len(h.HeaderFieldValue))
}
data = append(data, h.HeaderFieldValue...)
return data, nil
}
func (h *HeaderEnrichment) UnmarshalBinary(data []byte) error {
length := uint16(len(data))
var idx uint16 = 0
// Octet 5
if length < idx+1 {
return fmt.Errorf("Inadequate TLV length: %d", length)
}
h.HeaderType = data[idx] & Mask5
idx = idx + 1
// Octet 6
if length < idx+1 {
return fmt.Errorf("Inadequate TLV length: %d", length)
}
h.LengthOfHeaderFieldName = data[idx]
idx = idx + 1
// Octet 7 to m
if length < idx+uint16(h.LengthOfHeaderFieldName) {
return fmt.Errorf("Inadequate TLV length: %d", length)
}
h.HeaderFieldName = data[idx : idx+uint16(h.LengthOfHeaderFieldName)]
idx = idx + uint16(h.LengthOfHeaderFieldName)
// Octet p
if length < idx+1 {
return fmt.Errorf("Inadequate TLV length: %d", length)
}
h.LengthOfHeaderFieldValue = data[idx]
idx = idx + 1
// Octet (p+1) to q
if length < idx+uint16(h.LengthOfHeaderFieldValue) {
return fmt.Errorf("Inadequate TLV length: %d", length)
}
h.HeaderFieldValue = data[idx : idx+uint16(h.LengthOfHeaderFieldValue)]
idx = idx + uint16(h.LengthOfHeaderFieldValue)
if length != idx {
return fmt.Errorf("Inadequate TLV length: %d", length)
}
return nil
}