/*! Reads header data from the actual header of the message
* Remainig fragment buf and length is in frag->frag and frag->frag_len
*
* @return 0 on success */
long
gcs_act_proto_read (gcs_act_frag_t* frag, const void* buf, size_t buf_len)
{
frag->proto_ver = ((uint8_t*)buf)[PROTO_PV_OFFSET];
if (gu_unlikely(buf_len < PROTO_DATA_OFFSET)) {
gu_error ("Action message too short: %zu, expected at least %d",
buf_len, PROTO_DATA_OFFSET);
return -EBADMSG;
}
if (gu_unlikely(frag->proto_ver > PROTO_VERSION)) {
gu_error ("Bad protocol version %d, expected %d",
frag->proto_ver, PROTO_VERSION);
return -EPROTO; // this fragment should be dropped
}
((uint8_t*)buf)[PROTO_PV_OFFSET] = 0x0;
frag->act_id = gu_be64(*(uint64_t*)buf);
frag->act_size = gtohl (((uint32_t*)buf)[2]);
frag->frag_no = gtohl (((uint32_t*)buf)[3]);
frag->act_type = ((uint8_t*)buf)[PROTO_AT_OFFSET];
frag->frag = ((uint8_t*)buf) + PROTO_DATA_OFFSET;
frag->frag_len = buf_len - PROTO_DATA_OFFSET;
/* return 0 or -EMSGSIZE */
return ((frag->act_size > GCS_MAX_ACT_SIZE) * -EMSGSIZE);
}
ssize_t len (ssize_t offset) const
{
return gtohl(*(reinterpret_cast<uint32_t*>(req_ + offset)));
}