dali/bacnet_stack
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Moved the bvlc portion to datalink.h. Changed the bip_receive to use the same buffer and shift data in.

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This commit is contained in:
skarg
2007-08-11 17:17:29 +00:00
parent 722b183f98
commit 75ae61d9ce
1 changed files with 16 additions and 17 deletions
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bacnet-stack/bip.c
+16 -17
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@@ -165,14 +165,14 @@ uint16_t bip_receive(BACNET_ADDRESS * src, /* source address */
uint16_t max_pdu, /* amount of space available in the PDU */
unsigned timeout)
{ /* number of milliseconds to wait for a packet */
int received_bytes;
uint8_t buf[MAX_MPDU] = { 0 }; /* data */
int received_bytes = 0;
uint16_t pdu_len = 0; /* return value */
fd_set read_fds;
int max;
int max = 0;
struct timeval select_timeout;
struct sockaddr_in sin = { -1 };
socklen_t sin_len = sizeof(sin);
unsigned i = 0;
/* Make sure the socket is open */
if (BIP_Socket < 0)
@@ -195,7 +195,7 @@ uint16_t bip_receive(BACNET_ADDRESS * src, /* source address */
/* see if there is a packet for us */
if (select(max + 1, &read_fds, NULL, NULL, &select_timeout) > 0)
received_bytes = recvfrom(BIP_Socket,
(char *) &buf[0], MAX_MPDU, 0,
(char *) &pdu[0], max_pdu, 0,
(struct sockaddr *) &sin, &sin_len);
else
return 0;
@@ -210,10 +210,10 @@ uint16_t bip_receive(BACNET_ADDRESS * src, /* source address */
return 0;
/* the signature of a BACnet/IP packet */
if (buf[0] != BVLL_TYPE_BACNET_IP)
if (pdu[0] != BVLL_TYPE_BACNET_IP)
return 0;
if ((buf[1] == BVLC_ORIGINAL_UNICAST_NPDU) ||
(buf[1] == BVLC_ORIGINAL_BROADCAST_NPDU)) {
if ((pdu[1] == BVLC_ORIGINAL_UNICAST_NPDU) ||
(pdu[1] == BVLC_ORIGINAL_BROADCAST_NPDU)) {
/* ignore messages from me */
if (sin.sin_addr.s_addr == htonl(BIP_Address.s_addr))
pdu_len = 0;
@@ -226,22 +226,21 @@ uint16_t bip_receive(BACNET_ADDRESS * src, /* source address */
/* FIXME: check destination address */
/* see if it is broadcast or for us */
/* decode the length of the PDU - length is inclusive of BVLC */
(void) decode_unsigned16(&buf[2], &pdu_len);
/* copy the buffer into the PDU */
pdu_len -= 4; /* BVLC header */
if (pdu_len < max_pdu)
memmove(&pdu[0], &buf[4], pdu_len);
(void) decode_unsigned16(&pdu[2], &pdu_len);
/* subtract off the BVLC header */
pdu_len -= 4;
if (pdu_len < max_pdu) {
/* shift the buffer to return a valid PDU */
for (i = 0; i < pdu_len; i++) {
pdu[i] = pdu[i+4];
}
}
/* ignore packets that are too large */
/* clients should check my max-apdu first */
else
pdu_len = 0;
}
}
#ifdef BBMD_ENABLED
if (buf[1] < MAX_BVLC_FUNCTION) {
bbmd_handler(&buf[0], received_bytes, &sin);
}
#endif
return pdu_len;
}