/**
* set a string from another buffer.
* The string will use the supplied buffer (it not copy the string),
* so it should be a pointer returned by malloc.
* @param s dynamic string
* @param src source buffer
* @return string copied or NULL on memory error
*/
DSTR*
tds_dstr_set(DSTR * s, char *src)
{
DSTR *res = tds_dstr_copy(s, src);
if (TDS_LIKELY(res != NULL))
free(src);
return res;
}
static TDSPACKET*
tds_build_packet(TDSSOCKET *tds, unsigned char *buf, unsigned len)
{
unsigned start;
TDS72_SMP_HEADER mars[2], *p;
TDSPACKET *packet;
p = mars;
if (buf[0] != TDS72_SMP && tds->conn->mars) {
/* allocate a new sid */
if (tds->sid == -1) {
p->signature = TDS72_SMP;
p->type = TDS_SMP_SYN; /* start session */
/* FIXME check !!! */
tds_alloc_new_sid(tds);
tds->recv_seq = 0;
tds->send_seq = 0;
tds->recv_wnd = 4;
tds->send_wnd = 4;
TDS_PUT_A2LE(&p->sid, tds->sid);
p->size = TDS_HOST4LE(0x10);
p->seq = TDS_HOST4LE(0);
TDS_PUT_A4LE(&p->wnd, tds->recv_wnd);
p++;
}
if (tds->sid >= 0) {
p->signature = TDS72_SMP;
p->type = TDS_SMP_DATA;
TDS_PUT_A2LE(&p->sid, tds->sid);
TDS_PUT_A4LE(&p->size, len+16);
TDS_PUT_A4LE(&p->seq, ++tds->send_seq);
/* this is the acknowledge we give to server to stop sending !!! */
tds->recv_wnd = tds->recv_seq + 4;
TDS_PUT_A4LE(&p->wnd, tds->recv_wnd);
p++;
}
}
start = (p - mars) * sizeof(mars[0]);
packet = tds_get_packet(tds->conn, len + start);
if (TDS_LIKELY(packet)) {
packet->sid = tds->sid;
memcpy(packet->buf, mars, start);
memcpy(packet->buf + start, buf, len);
packet->len = len + start;
}
return packet;
}
