uint net_field_length_size(const uchar *ptr) {
 if (*ptr <= 251) return 1;
 if (*ptr == 252) return 3;
 if (*ptr == 253) return 4;
 return 9;
}

uint64_t net_field_length_ll(uchar **packet) {
 const uchar *pos = *packet;
 if (*pos < 251) {
   (*packet)++;
   return (uint64_t)*pos;
 }
 if (*pos == 251) {
   (*packet)++;
   return (uint64_t)NULL_LENGTH;
 }
 if (*pos == 252) {
   (*packet) += 3;
   return (uint64_t)uint2korr(pos + 1);
 }
 if (*pos == 253) {
   (*packet) += 4;
   return (uint64_t)uint3korr(pos + 1);
 }
 (*packet) += 9; /* Must be 254 when here */
 return (uint64_t)uint8korr(pos + 1);
}