1 /***************************************************************************
2 * Copyright (C) 2006 by Gerd v. Egidy *
5 * This library is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU Lesser General Public License version *
7 * 2.1 as published by the Free Software Foundation. *
9 * This library is distributed in the hope that it will be useful, *
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
12 * GNU Lesser General Public License for more details. *
14 * You should have received a copy of the GNU Lesser General Public *
15 * License along with this program; if not, write to the *
16 * Free Software Foundation, Inc., *
17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
18 ***************************************************************************/
24 #include <netinet/in.h>
26 #include "connection.hxx"
31 connection::packet_size_indicator connection::bytes_available()
33 // no size information -> no packet
34 if (buffer.size() < sizeof(packet_size_indicator))
37 packet_size_indicator psize=ntohl(*((packet_size_indicator*)(buffer.data())));
39 // enough data for one packet in buffer?
40 if (buffer.size() < sizeof(packet_size_indicator)+psize)
43 // ok, full packet there
47 /** @brief read a complete data packet from the buffer. The packet is removed from the
49 @param[out] data the data package
50 @retval true if packet found
52 bool connection::get_packet(std::string& data)
54 packet_size_indicator psize;
56 if ((psize=bytes_available()))
58 data.assign(buffer,sizeof(packet_size_indicator),psize);
59 buffer.erase(0,sizeof(packet_size_indicator)+psize);
66 /** @brief get (maybe incomplete) data of the next packet from the buffer. Does not remove the data
67 from the connection buffer.
68 @param[out] data the data package
69 @retval full size of the packet when it will be complete
71 unsigned int connection::peek_packet(std::string& data)
73 // no size information -> no packet
74 if (buffer.size() < sizeof(packet_size_indicator))
77 packet_size_indicator psize=ntohl(*((packet_size_indicator*)(buffer.data())));
79 // not the full data available?
80 packet_size_indicator currsize=psize;
81 if (buffer.size() < currsize+sizeof(packet_size_indicator))
82 currsize=buffer.size()-sizeof(packet_size_indicator);
84 data.assign(buffer,sizeof(packet_size_indicator),currsize);
89 /// send a blob to the peer
90 void connection::write(const std::string& data)
92 // prepend packet size to data
93 packet_size_indicator psize=htonl(data.size());
94 std::string send_data(data);
95 send_data.insert(0,(char*)&psize,sizeof(packet_size_indicator));
97 real_write(send_data);