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...
...
...
#define NX_SOURCE_CODE
#include "nx_api.h"
#include "nx_tcp.h"
#include "nx_packet.h"
...
...
UINT _nx_tcp_socket_bytes_available(NX_TCP_SOCKET *socket_ptr, ULONG *bytes_available)
{
NX_IP *ip_ptr;
NX_PACKET *packet_ptr;
UINT data_size;
NX_TCP_HEADER *header_ptr;
UINT header_length;
INT done = 0;
ip_ptr = socket_ptr -> nx_tcp_socket_ip_ptr;
tx_mutex_get(&(ip_ptr -> nx_ip_protection), TX_WAIT_FOREVER);
*bytes_available = 0;
if ((socket_ptr -> nx_tcp_socket_state <= NX_TCP_LISTEN_STATE) ||
(socket_ptr -> nx_tcp_socket_state > NX_TCP_ESTABLISHED))
{
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
return(NX_NOT_CONNECTED);
}if ((socket_ptr -> nx_tcp_socket_state <= NX_TCP_LISTEN_STATE) || (socket_ptr -> nx_tcp_socket_state > NX_TCP_ESTABLISHED)) { ... }
packet_ptr = socket_ptr -> nx_tcp_socket_receive_queue_head;
if (packet_ptr == NX_NULL)
{
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
return(NX_SUCCESS);
}if (packet_ptr == NX_NULL) { ... }
/* ... */
do
{
if (packet_ptr -> nx_packet_queue_next == ((NX_PACKET *)NX_PACKET_READY))
{
header_ptr = (NX_TCP_HEADER *)packet_ptr -> nx_packet_prepend_ptr;
header_length = (UINT)((header_ptr -> nx_tcp_header_word_3 >> NX_TCP_HEADER_SHIFT) * sizeof(ULONG));
data_size = (UINT)(packet_ptr -> nx_packet_length - header_length);
*bytes_available += data_size;
if (packet_ptr == socket_ptr -> nx_tcp_socket_receive_queue_tail)
{
done = 1;
}if (packet_ptr == socket_ptr -> nx_tcp_socket_receive_queue_tail) { ... }
else
{
packet_ptr = packet_ptr -> nx_packet_union_next.nx_packet_tcp_queue_next;
}else { ... }
}if (packet_ptr -> nx_packet_queue_next == ((NX_PACKET *)NX_PACKET_READY)) { ... }
else
{
/* ... */
done = 1;
}else { ... }
...} while (!done);
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
return(NX_SUCCESS);
}{ ... }