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#include "core.h"
int _ecp_rbuf_start(ECPRBuffer *rbuf, ecp_seq_t seq) {
rbuf->seq_max = seq;
rbuf->seq_start = seq + 1;
return ECP_OK;
}
int _ecp_rbuf_msg_idx(ECPRBuffer *rbuf, ecp_seq_t seq, unsigned short *idx) {
ecp_seq_t seq_offset = seq - rbuf->seq_start;
/* This also checks for seq_start <= seq if seq type range >> rbuf->arr_size */
if (seq_offset >= rbuf->arr_size) return ECP_ERR_FULL;
*idx = ECP_RBUF_IDX_MASK(rbuf->idx_start + seq_offset, rbuf->arr_size);
return ECP_OK;
}
int ecp_rbuf_create(ECPConnection *conn, ECPRBSend *buf_s, ECPRBPacket *msg_s, unsigned int msg_s_size, ECPRBRecv *buf_r, ECPRBMessage *msg_r, unsigned int msg_r_size) {
int rv;
if (buf_s) {
rv = ecp_rbuf_send_create(conn, buf_s, msg_s, msg_s_size);
if (rv) return rv;
rv = ecp_rbuf_send_start(conn);
if (rv) {
ecp_rbuf_send_destroy(conn);
return rv;
}
}
if (buf_r) {
rv = ecp_rbuf_recv_create(conn, buf_r, msg_r, msg_r_size);
if (rv) {
if (buf_s) ecp_rbuf_send_destroy(conn);
return rv;
}
}
return ECP_OK;
}
void ecp_rbuf_destroy(ECPConnection *conn) {
ecp_rbuf_send_destroy(conn);
ecp_rbuf_recv_destroy(conn);
}
int ecp_rbuf_handle_seq(ECPConnection *conn, unsigned char mtype) {
if (conn->rbuf.recv || (mtype == ECP_MTYPE_RBACK) || (mtype == ECP_MTYPE_RBFLUSH)) return 1;
return 0;
}
int ecp_rbuf_set_seq(ECPConnection *conn, ECPSeqItem *si, unsigned char *payload, size_t pld_size) {
ECPRBSend *buf = conn->rbuf.send;
ECPRBuffer *rbuf = &buf->rbuf;
unsigned char mtype;
unsigned short idx;
int rv;
if (si->rb_pass) return ECP_OK;
buf = conn->rbuf.send;
#ifdef ECP_WITH_PTHREAD
pthread_mutex_lock(&buf->mutex);
#endif
rv = _ecp_rbuf_msg_idx(rbuf, si->seq, &idx);
#ifdef ECP_WITH_PTHREAD
pthread_mutex_unlock(&buf->mutex);
#endif
if (rv) return rv;
rv = ecp_pld_get_type(payload, pld_size, &mtype);
if (rv) return rv;
si->rb_mtype = mtype;
si->rb_idx = idx;
rbuf->arr.pkt[idx].size = 0;
rbuf->arr.pkt[idx].flags = 0;
return ECP_OK;
}
ssize_t ecp_rbuf_pld_send(ECPConnection *conn, ECPBuffer *packet, ECPBuffer *payload, size_t pld_size, unsigned char flags, ecp_seq_t seq) {
ECPSocket *sock = conn->sock;
ECPContext *ctx = sock->ctx;
ECPNetAddr addr;
ECPSeqItem seq_item;
int _rv;
ssize_t rv;
_rv = ecp_seq_item_init(&seq_item);
if (_rv) return _rv;
seq_item.seq = seq;
seq_item.seq_w = 1;
seq_item.rb_pass = 1;
rv = ecp_pack_conn(conn, packet, ECP_ECDH_IDX_INV, ECP_ECDH_IDX_INV, payload, pld_size, &addr, &seq_item);
if (rv < 0) return rv;
rv = ecp_pkt_send(sock, &addr, packet, rv, flags);
if (rv < 0) return rv;
return rv;
}
ssize_t ecp_rbuf_pkt_send(ECPConnection *conn, ECPSocket *sock, ECPNetAddr *addr, ECPBuffer *packet, size_t pkt_size, unsigned char flags, ECPTimerItem *ti, ECPSeqItem *si) {
ECPRBSend *buf = conn->rbuf.send;
ECPRBuffer *rbuf = &buf->rbuf;
ecp_seq_t seq = si->seq;
unsigned short idx = si->rb_idx;
unsigned char mtype = si->rb_mtype & ECP_MTYPE_MASK;
unsigned char _flags;
int rb_rel;
int rb_cc;
int do_send;
int do_skip;
int _rv = ECP_OK;
ssize_t rv = 0;
if (pkt_size == 0) return ECP_ERR;
do_send = 1;
do_skip = ecp_rbuf_skip(mtype);
#ifdef ECP_WITH_PTHREAD
pthread_mutex_lock(&buf->mutex);
#endif
rb_rel = (buf->flags & ECP_RBUF_FLAG_RELIABLE);
rb_cc = ((buf->flags & ECP_RBUF_FLAG_CCONTROL) && (buf->cnt_cc || (buf->in_transit >= buf->win_size)));
if (rb_rel || rb_cc) {
ECPRBTimer *rb_timer = NULL;
ECPRBTimerItem *rb_ti = NULL;
_flags = ECP_RBUF_FLAG_IN_RBUF;
if (do_skip) {
_flags |= ECP_RBUF_FLAG_SKIP;
} else {
do_send = 0;
}
if (rbuf->arr.pkt[idx].flags) _rv = ECP_ERR_RBUF_DUP;
if (!_rv && !do_send && ti) {
rb_timer = buf->timer;
#ifdef ECP_WITH_PTHREAD
pthread_mutex_lock(&rb_timer->mutex);
#endif
rb_ti = &rb_timer->item[rb_timer->idx_w];
if (rb_ti->empty) {
rb_ti->empty = 0;
rb_ti->item = *ti;
rb_timer->idx_w = (rb_timer->idx_w + 1) % ECP_MAX_TIMER;
} else {
_rv = ECP_ERR_MAX_TIMER;
}
#ifdef ECP_WITH_PTHREAD
pthread_mutex_unlock(&rb_timer->mutex);
#endif
}
if (_rv) {
rv = _rv;
goto pkt_send_fin;
}
if (!do_send) {
memcpy(rbuf->arr.pkt[idx].buf, packet->buffer, pkt_size);
rbuf->arr.pkt[idx].size = pkt_size;
rbuf->arr.pkt[idx].timer = rb_ti;
rv = pkt_size;
}
rbuf->arr.pkt[idx].flags = _flags;
if (ECP_SEQ_LT(rbuf->seq_max, seq)) rbuf->seq_max = seq;
if (rb_cc && !do_send) {
if (buf->cnt_cc == 0) buf->seq_cc = seq;
buf->cnt_cc++;
}
}
if ((buf->flags & ECP_RBUF_FLAG_CCONTROL) && !do_skip && do_send) {
buf->in_transit++;
}
pkt_send_fin:
#ifdef ECP_WITH_PTHREAD
pthread_mutex_unlock(&buf->mutex);
#endif
if (rv < 0) return rv;
if (do_send) {
if (ti) {
_rv = ecp_timer_push(ti);
if (_rv) return _rv;
}
rv = ecp_pkt_send(sock, addr, packet, pkt_size, flags);
}
return rv;
}
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