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 TCPSocketConnection::TCPSocketConnection() :
00025         _is_connected(false) {
00026 }
00027 
00028 int TCPSocketConnection::connect(const char* host, const int port) {
00029     if (init_socket(SOCK_STREAM) < 0)
00030         return -1;
00031     
00032     if (set_address(host, port) != 0)
00033         return -1;
00034     
00035     if (lwip_connect(_sock_fd, (const struct sockaddr *) &_remoteHost, sizeof(_remoteHost)) < 0) {
00036         close();
00037         return -1;
00038     }
00039     _is_connected = true;
00040     
00041     return 0;
00042 }
00043 
00044 bool TCPSocketConnection::is_connected(void) {
00045     return _is_connected;
00046 }
00047 
00048 int TCPSocketConnection::send(char* data, int length) {
00049     if ((_sock_fd < 0) || !_is_connected)
00050         return -1;
00051     
00052     if (!_blocking) {
00053         TimeInterval timeout(_timeout);
00054         if (wait_writable(timeout) != 0)
00055             return -1;
00056     }
00057     
00058     int n = lwip_send(_sock_fd, data, length, 0);
00059     _is_connected = (n != 0);
00060     
00061     return n;
00062 }
00063 
00064 // -1 if unsuccessful, else number of bytes written
00065 int TCPSocketConnection::send_all(char* data, int length) {
00066     if ((_sock_fd < 0) || !_is_connected)
00067         return -1;
00068     
00069     size_t writtenLen = 0;
00070     TimeInterval timeout(_timeout);
00071     while (writtenLen < length) {
00072         if (!_blocking) {
00073             // Wait for socket to be writeable
00074             if (wait_writable(timeout) != 0)
00075                 return writtenLen;
00076         }
00077         
00078         int ret = lwip_send(_sock_fd, data + writtenLen, length - writtenLen, 0);
00079         if (ret > 0) {
00080             writtenLen += ret;
00081             continue;
00082         } else if (ret == 0) {
00083             _is_connected = false;
00084             return writtenLen;
00085         } else {
00086             return -1; //Connnection error
00087         }
00088     }
00089     return writtenLen;
00090 }
00091 
00092 int TCPSocketConnection::receive(char* data, int length) {
00093     if ((_sock_fd < 0) || !_is_connected)
00094         return -1;
00095     
00096     if (!_blocking) {
00097         TimeInterval timeout(_timeout);
00098         if (wait_readable(timeout) != 0)
00099             return -1;
00100     }
00101     
00102     int n = lwip_recv(_sock_fd, data, length, 0);
00103     _is_connected = (n != 0);
00104     
00105     return n;
00106 }
00107 
00108 // -1 if unsuccessful, else number of bytes received
00109 int TCPSocketConnection::receive_all(char* data, int length) {
00110     if ((_sock_fd < 0) || !_is_connected)
00111         return -1;
00112     
00113     size_t readLen = 0;
00114     TimeInterval timeout(_timeout);
00115     while (readLen < length) {
00116         if (!_blocking) {
00117             //Wait for socket to be readable
00118             if (wait_readable(timeout) != 0)
00119                 return readLen;
00120         }
00121         
00122         int ret = lwip_recv(_sock_fd, data + readLen, length - readLen, 0);
00123         if (ret > 0) {
00124             readLen += ret;
00125         } else if (ret == 0) {
00126             _is_connected = false;
00127             return readLen;
00128         } else {
00129             return -1; //Connnection error
00130         }
00131     }
00132     return readLen;
00133 }