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 
00019 #include "TCPSocketConnection.h"
00020 #include <cstring>
00021 
00022 using std::memset;
00023 using std::memcpy;
00024 
00025 // not a big code.
00026 // refer from EthernetInterface by mbed official driver
00027 TCPSocketConnection::TCPSocketConnection() :
00028     _is_connected(false)
00029 {
00030 }
00031 
00032 int TCPSocketConnection::connect(const char* host, const int port)
00033 {
00034     if (_sock_fd < 0) {
00035         _sock_fd = eth->new_socket();
00036         if (_sock_fd < 0) {
00037             return -1;
00038         }
00039     }
00040     if (set_address(host, port) != 0) {
00041         return -1;
00042     }
00043     if (!eth->connect(_sock_fd, get_address(), port)) {
00044         return -1;
00045     }
00046     set_blocking(false);
00047     // add code refer from EthernetInterface.
00048     _is_connected = true;
00049 
00050     return 0;
00051 }
00052 
00053 bool TCPSocketConnection::is_connected(void)
00054 {
00055     // force update recent state.
00056     _is_connected = eth->is_connected(_sock_fd);
00057     return _is_connected;
00058 }
00059 
00060 int TCPSocketConnection::send(char* data, int length)
00061 {
00062     if((_sock_fd<0) || !(eth->is_connected(_sock_fd)))
00063         return -1;
00064 
00065     int size = eth->wait_writeable(_sock_fd, _blocking ? -1 : _timeout);
00066     if (size < 0) 
00067         return -1;
00068 
00069     if (size > length) 
00070         size = length;
00071 
00072     return eth->send(_sock_fd, data, size);
00073 }
00074 
00075 // -1 if unsuccessful, else number of bytes written
00076 int TCPSocketConnection::send_all(char* data, int length)
00077 {
00078     int writtenLen = 0;
00079 
00080     if(_sock_fd<0)
00081         return -1;
00082 
00083     while (writtenLen < length) {
00084 
00085         if(!(eth->is_connected(_sock_fd)))
00086             return -1;
00087 
00088         int size = eth->wait_writeable(_sock_fd, _blocking ? -1 : _timeout);
00089         if (size < 0) {
00090             return -1;
00091         }
00092         if (size > (length-writtenLen)) {
00093             size = (length-writtenLen);
00094         }
00095         int ret = eth->send(_sock_fd, data + writtenLen, size);
00096         if (ret < 0) {
00097             return -1;
00098         }
00099         writtenLen += ret;
00100     }
00101     return writtenLen;
00102 }
00103 
00104 // -1 if unsuccessful, else number of bytes received
00105 int TCPSocketConnection::receive(char* data, int length)
00106 {
00107     if((_sock_fd<0) || !(eth->is_connected(_sock_fd)))
00108         return -1;
00109 
00110     int size = eth->wait_readable(_sock_fd, _blocking ? -1 : _timeout);
00111     if (size < 0) {
00112         return -1;
00113     }
00114     if (size > length) {
00115         size = length;
00116     }
00117     return eth->recv(_sock_fd, data, size);
00118 }
00119 
00120 // -1 if unsuccessful, else number of bytes received
00121 int TCPSocketConnection::receive_all(char* data, int length)
00122 {
00123     if(_sock_fd<0)
00124         return -1;
00125 
00126     int readLen = 0;
00127     while (readLen < length) {
00128 
00129         if(!(eth->is_connected(_sock_fd)))
00130             return -1;
00131 
00132         int size = eth->wait_readable(_sock_fd, _blocking ? -1 :_timeout);
00133         if (size <= 0) {
00134             break;
00135         }
00136         if (size > (length - readLen)) {
00137             size = length - readLen;
00138         }
00139         int ret = eth->recv(_sock_fd, data + readLen, size);
00140         if (ret < 0) {
00141             return -1;
00142         }
00143         readLen += ret;
00144     }
00145     return readLen;
00146 }