udp sender/receiver improvements.

[paraslash.git] / udp_recv.c

diff --git a/udp_recv.c b/udp_recv.c
index b3ea83c625e172a04eb053bd12060d8794beabf4..66dc36b904822437851b538499f9fe43203ed3a2 100644 (file)
--- a/udp_recv.c
+++ b/udp_recv.c
@@ -53,9 +53,9 @@ static void udp_recv_pre_select(struct sched *s, struct task *t)
        para_fd_set(purd->fd, &s->rfds, &s->max_fileno);
 }
 
-static int enough_space(size_t packet_size, size_t loaded)
+static int enough_space(size_t nbytes, size_t loaded)
 {
-       return packet_size + loaded < UDP_RECV_CHUNK_SIZE + UDP_AUDIO_HEADER_LEN;
+       return nbytes + loaded < UDP_RECV_CHUNK_SIZE;
 }
 
 static void udp_recv_post_select(__a_unused struct sched *s, struct task *t)
@@ -75,20 +75,21 @@ static void udp_recv_post_select(__a_unused struct sched *s, struct task *t)
                return;
        ret = recv_bin_buffer(purd->fd, tmpbuf, UDP_RECV_CHUNK_SIZE);
        if (ret < 0) {
-               t->error = 0;
-               if (errno != EINTR && errno != EAGAIN)
-                       t->error = -ERRNO_TO_PARA_ERROR(errno);
+               if (is_errno(ret, EINTR) || is_errno(ret, EAGAIN))
+                       goto success;
+               t->error = ret;
                return;
        }
+       t->error = -E_RECV_EOF;
+       if (!ret)
+               return;
        packet_size = ret;
-       if (packet_size < UDP_AUDIO_HEADER_LEN) {
-               t->error = -E_UDP_SHORT_PACKET; /* FIXME: We shouldn't fail here */
+       t->error = -E_UDP_SHORT_PACKET;
+       if (packet_size < UDP_AUDIO_HEADER_LEN)
                return;
-       }
-       if (udp_check_magic(tmpbuf, packet_size) < 0) {
-               t->error = -E_UDP_NO_MAGIC;
+       t->error = -E_UDP_NO_MAGIC;
+       if (udp_check_magic(tmpbuf, packet_size) < 0)
                return;
-       }
        stream_type = udp_read_stream_type(tmpbuf);
        packet_type = udp_read_packet_type(tmpbuf);
 //     PARA_INFO_LOG("packet type: %d, stream type: %d,"
@@ -96,6 +97,7 @@ static void udp_recv_post_select(__a_unused struct sched *s, struct task *t)
 //             (unsigned) stream_type, rn->loaded);
        switch (packet_type) {
                uint16_t header_len, payload_len;
+
        case UDP_EOF_PACKET:
                t->error = -E_RECV_EOF;
                return;
@@ -105,23 +107,19 @@ static void udp_recv_post_select(__a_unused struct sched *s, struct task *t)
                /* fall through */
        case UDP_DATA_PACKET:
                if (!purd->have_header && stream_type == UDP_HEADER_STREAM)
-               /* can't use the data, wait for header */
+                       /* can't use the data, wait for header */
                        goto success;
-               if (!enough_space(packet_size, rn->loaded)) {
-                       t->error = -E_OVERRUN;
+               payload_len = packet_size - UDP_AUDIO_HEADER_LEN;
+               if (!payload_len)
+                       goto success;
+               t->error = -E_OVERRUN;
+               if (!enough_space(payload_len, rn->loaded))
                        return;
-               }
-               if (packet_size > UDP_AUDIO_HEADER_LEN) {
-                       memcpy(rn->buf + rn->loaded, tmpbuf + UDP_AUDIO_HEADER_LEN,
-                               packet_size - UDP_AUDIO_HEADER_LEN);
-                       rn->loaded += packet_size - UDP_AUDIO_HEADER_LEN;
-               }
+               memcpy(rn->buf + rn->loaded, tmpbuf + UDP_AUDIO_HEADER_LEN,
+                       payload_len);
+               rn->loaded += payload_len;
                goto success;
        case UDP_HEADER_PACKET:
-               if (!enough_space(packet_size, rn->loaded)) {
-                       t->error = -E_OVERRUN;
-                       return;
-               }
                header_len = udp_read_header_len(tmpbuf);
                if (header_len + UDP_AUDIO_HEADER_LEN > packet_size) {
                        t->error = -E_INVALID_HEADER;
@@ -130,21 +128,23 @@ static void udp_recv_post_select(__a_unused struct sched *s, struct task *t)
 //             PARA_DEBUG_LOG("header packet (%zu bytes), header len: %d\n",
 //                     packet_size, header_len);
                if (!purd->have_header) {
+                       t->error = -E_OVERRUN;
+                       if (!enough_space(header_len, rn->loaded))
+                               return;
                        purd->have_header = 1;
                        rn->loaded = header_len;
                        memcpy(rn->buf, tmpbuf + UDP_AUDIO_HEADER_LEN,
                                rn->loaded);
-//                     sleep(1);
                        goto success;
                }
                payload_len = packet_size - UDP_AUDIO_HEADER_LEN - header_len;
-               if (rn->loaded + payload_len > UDP_RECV_CHUNK_SIZE) {
-                       t->error = -E_OVERRUN;
+               if (!payload_len)
+                       goto success;
+               t->error = -E_OVERRUN;
+               if (!enough_space(payload_len, rn->loaded))
                        return;
-               }
-               if (payload_len)
-                       memcpy(rn->buf + rn->loaded, tmpbuf
-                               + (packet_size - payload_len), payload_len);
+               memcpy(rn->buf + rn->loaded, tmpbuf + UDP_AUDIO_HEADER_LEN +
+                       header_len, payload_len);
                rn->loaded += payload_len;
        }
 success: