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Handle multiple MQTT messages per RECV event

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PUBLISHED_FROM=fc98c51254dd94d3f443fb66e49449da7d9e754c
This commit is contained in:
Deomid Ryabkov 2017-04-10 18:34:35 +03:00 committed by Cesanta Bot
parent bd130136bc
commit 08a10a8af5
1 changed files with 19 additions and 11 deletions
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30
mongoose.c
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@ -9740,21 +9740,27 @@ static const char *scanto(const char *p, struct mg_str *s) {
MG_INTERNAL int parse_mqtt(struct mbuf *io, struct mg_mqtt_message *mm) {
uint8_t header;
size_t len = 0;
size_t len = 0, len_len = 0;
const char *p, *end;
unsigned char lc = 0;
int cmd;
const char *p = &io->buf[1], *end;
if (io->len < 2) return -1;
header = io->buf[0];
cmd = header >> 4;
/* decode mqtt variable length */
do {
len += (*p & 127) << 7 * (p - &io->buf[1]);
} while ((*p++ & 128) != 0 && ((size_t)(p - io->buf) <= io->len));
len = len_len = 0;
p = io->buf + 1;
while ((size_t)(p - io->buf) < io->len) {
lc = *((const unsigned char *) p++);
len += (lc & 0x7f) << 7 * len_len;
len_len++;
if (!(lc & 0x80) || (len_len > sizeof(len))) break;
}
end = p + len;
if (end > io->buf + io->len + 1) {
if (lc & 0x80 || end > io->buf + io->len) {
return -1;
}
@ -9829,7 +9835,6 @@ MG_INTERNAL int parse_mqtt(struct mbuf *io, struct mg_mqtt_message *mm) {
static void mqtt_handler(struct mg_connection *nc, int ev,
void *ev_data MG_UD_ARG(void *user_data)) {
int len;
struct mbuf *io = &nc->recv_mbuf;
struct mg_mqtt_message mm;
memset(&mm, 0, sizeof(mm));
@ -9838,10 +9843,13 @@ static void mqtt_handler(struct mg_connection *nc, int ev,
switch (ev) {
case MG_EV_RECV:
len = parse_mqtt(io, &mm);
if (len == -1) break; /* not fully buffered */
nc->handler(nc, MG_MQTT_EVENT_BASE + mm.cmd, &mm MG_UD_ARG(user_data));
mbuf_remove(io, len);
/* There can be multiple messages in the buffer, process them all. */
while (1) {
int len = parse_mqtt(io, &mm);
if (len == -1) break; /* not fully buffered */
nc->handler(nc, MG_MQTT_EVENT_BASE + mm.cmd, &mm MG_UD_ARG(user_data));
mbuf_remove(io, len);
}
break;
}
}