/* gs_transmitter.cc - Classe de transmission des grosses string */ /* Simulotron - Programme de simulation de robot {{{ * * Copyright (C) 2005 Nicolas Haller * * Robot APB Team/Efrei 2005. * Web: http://assos.efrei.fr/robot/ * Email: robot AT efrei DOT fr * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * }}} */ #include "gs/gs_transmitter.hh" #include "gs/gs_message.hh" #include "socket/socket_client.hh" #include #include GSTransmitter::GSTransmitter(SocketClient & socket) :socket_(socket) { } /// Renvoie 0 quand un message est récupéré, -1 sinon int GSTransmitter::getGS(GSMessage & gsm) { ///\bug Pas portable le code, suppose des int à 4 octect fd_set fds; timeval tv = {0, 0}; unsigned int size = 0; FD_ZERO(&fds); FD_SET(socket_.getFD(), &fds); //On lit le socket que si y'a quelque chose à lire ///\bug C'est top ca? if(select(socket_.getFD() + 1, &fds, NULL, NULL, &tv) > 0) { std::string strRead (socket_.read ()); strBrut_ += strRead; } // Si la chaine à moins de 4 octect, y'a pas de message if (strBrut_.size() < 4) return -1; // On récupère la taille de la gs grace au 4 premier octect size = static_cast (strBrut_[0]) << 24 | static_cast (strBrut_[1]) << 16 | static_cast (strBrut_[2]) << 8 | static_cast (strBrut_[3]); if(size > strBrut_.size() - 4) return -1; gsm.writeGS (strBrut_.substr(4, size).data(), size); strBrut_.erase (0, size + 4); return 0; } void GSTransmitter::putGS(const GSMessage & gsm) { ///\bug Pas portable le code, suppose des int à 4 octect std::string gs(gsm.getGS ()); char bsize[4]; int size = gs.size(); // On transfore la taille de la gs en 4 octect qui seront envoyé en premier bsize[0] = static_cast (size >> 24); bsize[1] = static_cast (size >> 16); bsize[2] = static_cast (size >> 8); bsize[3] = static_cast (size); gs.insert(0, bsize, 4); socket_.write (gs); }