func NewDNSTransportUpstreamCodec(domain string) (*DNSTransportUpstreamCodec, error) {
ret := DNSTransportUpstreamCodec{domain: domain + "."}
var ok bool
if ret.domain_label_count, ok = dns.IsDomainName(ret.domain); !ok {
return nil, fmt.Errorf("Bad domain %d", domain)
}
name_len := 255 - len(ret.domain)
name_len -= 9 // seq number (4 byte --base32--> 8byte) + '.'
ret.max_len_per_name = name_len / 64 * DNS_UPSTREAM_MAX_LEN_PER_LABEL
if tmp := name_len % 64; tmp > 9 {
ret.max_len_per_name += (tmp - 1) / 8 * 5
}
ret.header_codec = bitcodec.NewBitcodec(&DNSCodecHeader{})
return &ret, nil
}
func NewDNSTransportDownstreamCodec() *DNSTransportDownstreamCodec {
codec := DNSTransportDownstreamCodec{}
codec.header_codec = bitcodec.NewBitcodec(&DNSCodecHeader{})
return &codec
}
