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#include "core.h"
int _ecp_rbuf_init(ECPRBuffer *rbuf, ECPRBMessage *msg, unsigned int msg_size) {
rbuf->msg = msg;
if (msg_size) {
if (msg == NULL) return ECP_ERR;
rbuf->msg_size = msg_size;
memset(rbuf->msg, 0, sizeof(ECPRBMessage) * msg_size);
} else {
rbuf->msg_size = ECP_SEQ_HALF;
}
return ECP_OK;
}
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) {
ecp_seq_t seq_offset = seq - rbuf->seq_start;
// This also checks for seq_start <= seq if seq type range >> rbuf->msg_size
if (seq_offset < rbuf->msg_size) return ECP_RBUF_IDX_MASK(rbuf->msg_start + seq_offset, rbuf->msg_size);
return ECP_ERR_RBUF_FULL;
}
ssize_t _ecp_rbuf_msg_store(ECPRBuffer *rbuf, ecp_seq_t seq, int idx, unsigned char *msg, size_t msg_size, unsigned char test_flags, unsigned char set_flags) {
idx = idx < 0 ? _ecp_rbuf_msg_idx(rbuf, seq) : idx;
if (idx < 0) return idx;
if (rbuf->msg == NULL) return 0;
if (test_flags && (test_flags & rbuf->msg[idx].flags)) return ECP_ERR_RBUF_DUP;
if (msg_size) memcpy(rbuf->msg[idx].msg, msg, msg_size);
rbuf->msg[idx].size = msg_size;
rbuf->msg[idx].flags = set_flags;
return msg_size;
}
int ecp_rbuf_create(ECPConnection *conn, ECPRBSend *buf_s, ECPRBMessage *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);
}
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;
ssize_t rv;
int _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, &seq_item, payload, pld_size, &addr);
if (rv < 0) return rv;
rv = ecp_pkt_send(sock, &addr, packet, rv, flags);
if (rv < 0) return rv;
return rv;
}
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;
unsigned char mtype;
int idx;
int rv;
if (si->rb_pass) return ECP_OK;
buf = conn->rbuf.send;
#ifdef ECP_WITH_PTHREAD
pthread_mutex_lock(&buf->mutex);
#endif
idx = _ecp_rbuf_msg_idx(&buf->rbuf, si->seq);
#ifdef ECP_WITH_PTHREAD
pthread_mutex_unlock(&buf->mutex);
#endif
if (idx < 0) return idx;
rv = ecp_pld_get_type(payload, pld_size, &mtype);
if (rv) return rv;
si->rb_mtype = mtype;
si->rb_idx = idx;
buf->rbuf.msg[idx].size = 0;
buf->rbuf.msg[idx].flags = 0;
return ECP_OK;
}
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;
int do_send = 1;
ssize_t rv = 0;
buf = conn->rbuf.send;
if (!si->rb_pass) {
unsigned char flags = 0;
ecp_seq_t seq = si->seq;
unsigned int idx = si->rb_idx;
unsigned char mtype = si->rb_mtype & ECP_MTYPE_MASK;
if (mtype < ECP_MAX_MTYPE_SYS) flags |= ECP_RBUF_FLAG_SYS;
rv = _ecp_rbuf_msg_store(&buf->rbuf, seq, idx, packet->buffer, pkt_size, 0, flags);
if (rv < 0) return rv;
if (buf->flags & ECP_RBUF_FLAG_CCONTROL) {
int _rv = ECP_OK;
#ifdef ECP_WITH_PTHREAD
pthread_mutex_lock(&buf->mutex);
#endif
if (ECP_SEQ_LT(buf->rbuf.seq_max, seq)) buf->rbuf.seq_max = seq;
if (buf->cnt_cc || (buf->in_transit >= buf->win_size)) {
if (!buf->cnt_cc) buf->seq_cc = seq;
buf->cnt_cc++;
buf->rbuf.msg[idx].flags |= ECP_RBUF_FLAG_IN_CCONTROL;
do_send = 0;
if (ti) {
ECPRBTimer *timer = &buf->timer;
ECPRBTimerItem *item = &timer->item[timer->idx_w];
if (!item->occupied) {
item->occupied = 1;
item->item = *ti;
buf->rbuf.msg[idx].idx_t = timer->idx_w;
timer->idx_w = (timer->idx_w) % ECP_MAX_TIMER;
} else {
_rv = ECP_ERR_MAX_TIMER;
}
} else {
buf->rbuf.msg[idx].idx_t = -1;
}
} else {
buf->in_transit++;
}
#ifdef ECP_WITH_PTHREAD
pthread_mutex_unlock(&buf->mutex);
#endif
if (_rv) return _rv;
}
}
if (do_send) {
if (ti) {
int _rv;
_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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