TCPSocketConnection.cpp

00001 /* Copyright (C) 2012 mbed.org, MIT License
00002  *
00003  * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
00004  * and associated documentation files (the "Software"), to deal in the Software without restriction,
00005  * including without limitation the rights to use, copy, modify, merge, publish, distribute,
00006  * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
00007  * furnished to do so, subject to the following conditions:
00008  *
00009  * The above copyright notice and this permission notice shall be included in all copies or
00010  * substantial portions of the Software.
00011  *
00012  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
00013  * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00014  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
00015  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00016  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00017  */
00018 #include "TCPSocketConnection.h"
00019 #include <cstring>
00020 
00021 using std::memset;
00022 using std::memcpy;
00023 
00024 // not a big code.
00025 // refer from EthernetInterface by mbed official driver
00026 TCPSocketConnection::TCPSocketConnection() :
00027     _is_connected(false)
00028 {
00029 }
00030 
00031 int TCPSocketConnection::connect(const char* host, const int port)
00032 {  
00033     if (_sock_fd < 0) {
00034         _sock_fd = eth->new_socket();
00035         if (_sock_fd < 0) {
00036             return -1;
00037         }
00038     }
00039     if (set_address(host, port) != 0) {
00040         return -1;
00041     }    
00042     if (!eth->connect(_sock_fd, get_address(), port)) {
00043         return -1;
00044     }
00045     set_blocking(false);
00046     // add code refer from EthernetInterface.
00047     _is_connected = true;
00048     return 0;
00049 }
00050 
00051 bool TCPSocketConnection::is_connected(void)
00052 {
00053     // force update recent state.
00054     _is_connected = eth->is_connected(_sock_fd);
00055     return _is_connected;
00056 }
00057 
00058 
00059 bool TCPSocketConnection::is_fin_received(void)
00060 {
00061     return eth->is_fin_received(_sock_fd);
00062 }
00063 
00064 int TCPSocketConnection::send(char* data, int length)
00065 {
00066     // add to cover exception.
00067     if ((_sock_fd < 0) || !_is_connected)
00068         return -1;
00069 
00070     int size = eth->wait_writeable(_sock_fd, _blocking ? -1 : _timeout);
00071     if (size < 0) {
00072         return -1;
00073     }
00074     if (size > length) {
00075         size = length;
00076     }
00077     return eth->send(_sock_fd, data, size);
00078 }
00079 
00080 // -1 if unsuccessful, else number of bytes written
00081 int TCPSocketConnection::send_all(char* data, int length)
00082 {
00083 
00084     int writtenLen = 0;
00085     while (writtenLen < length) {
00086         int size = eth->wait_writeable(_sock_fd, _blocking ? -1 : _timeout);
00087         if (size < 0) {
00088             return -1;
00089         }
00090         if (size > (length-writtenLen)) {
00091             size = (length-writtenLen);
00092         }
00093         int ret = eth->send(_sock_fd, data + writtenLen, size);
00094         if (ret < 0) {
00095             return -1;
00096         }
00097         writtenLen += ret;
00098     }
00099     return writtenLen;
00100 }
00101 
00102 // -1 if unsuccessful, else number of bytes received
00103 int TCPSocketConnection::receive(char* data, int length)
00104 {
00105     // add to cover exception.
00106     if ((_sock_fd < 0) || !_is_connected)
00107         return -1;
00108 
00109     int size = eth->wait_readable(_sock_fd, _blocking ? -1 : _timeout);
00110     if (size < 0) {
00111         return -1;
00112     }
00113     if (size > length) {
00114         size = length;
00115     }
00116     return eth->recv(_sock_fd, data, size);
00117 }
00118 
00119 // -1 if unsuccessful, else number of bytes received
00120 int TCPSocketConnection::receive_all(char* data, int length)
00121 {
00122     int readLen = 0;
00123     while (readLen < length) {
00124         int size = eth->wait_readable(_sock_fd, _blocking ? -1 :_timeout);
00125         if (size <= 0) {
00126             break;
00127         }
00128         if (size > (length - readLen)) {
00129             size = length - readLen;
00130         }
00131         int ret = eth->recv(_sock_fd, data + readLen, size);
00132         if (ret < 0) {
00133             return -1;
00134         }
00135         readLen += ret;
00136     }
00137     return readLen;
00138 }
00139