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source: code/branches/lastmanstanding2/src/libraries/network/packet/Packet.cc @ 8302

Last change on this file since 8302 was 7163, checked in by dafrick, 14 years ago

Merged presentation3 branch into trunk.

  • Property svn:eol-style set to native
File size: 7.3 KB
Line 
1/*
2 *   ORXONOX - the hottest 3D action shooter ever to exist
3 *                    > www.orxonox.net <
4 *
5 *
6 *   License notice:
7 *
8 *   This program is free software; you can redistribute it and/or
9 *   modify it under the terms of the GNU General Public License
10 *   as published by the Free Software Foundation; either version 2
11 *   of the License, or (at your option) any later version.
12 *
13 *   This program is distributed in the hope that it will be useful,
14 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
15 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 *   GNU General Public License for more details.
17 *
18 *   You should have received a copy of the GNU General Public License
19 *   along with this program; if not, write to the Free Software
20 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
21 *
22 *   Author:
23 *      Oliver Scheuss, (C) 2008
24 *   Co-authors:
25 *      ...
26 *
27 */
28
29
30#include "Packet.h"
31
32#include <cassert>
33#include <cstring>
34#define WIN32_LEAN_AND_MEAN
35#include <enet/enet.h>
36#include <boost/static_assert.hpp>
37
38#include "util/Debug.h"
39#include "Acknowledgement.h"
40#include "Chat.h"
41#include "ClassID.h"
42#include "DeleteObjects.h"
43#include "FunctionCalls.h"
44#include "FunctionIDs.h"
45#include "Gamestate.h"
46#include "Welcome.h"
47#include "network/Host.h"
48#include "network/ClientInformation.h"
49
50namespace orxonox{
51
52namespace packet{
53
54// Make sure we assume the right values
55BOOST_STATIC_ASSERT(static_cast<int>(PacketFlag::Reliable)   == static_cast<int>(ENET_PACKET_FLAG_RELIABLE));
56BOOST_STATIC_ASSERT(static_cast<int>(PacketFlag::Unsequence) == static_cast<int>(ENET_PACKET_FLAG_UNSEQUENCED));
57BOOST_STATIC_ASSERT(static_cast<int>(PacketFlag::NoAllocate) == static_cast<int>(ENET_PACKET_FLAG_NO_ALLOCATE));
58
59#define PACKET_FLAG_DEFAULT PacketFlag::NoAllocate
60#define _PACKETID           0
61
62std::map<size_t, Packet *> Packet::packetMap_;
63
64Packet::Packet()
65{
66  flags_ = PACKET_FLAG_DEFAULT;
67  packetDirection_ = Direction::Outgoing;
68  clientID_=0;
69  data_=0;
70  enetPacket_=0;
71  bDataENetAllocated_ = false;
72}
73
74Packet::Packet(uint8_t *data, unsigned int clientID)
75{
76  flags_ = PACKET_FLAG_DEFAULT;
77  packetDirection_ = Direction::Incoming;
78  clientID_=clientID;
79  data_=data;
80  enetPacket_=0;
81  bDataENetAllocated_ = false;
82}
83
84
85Packet::Packet(const Packet &p){
86  enetPacket_=p.enetPacket_;
87  flags_=p.flags_;
88  packetDirection_ = p.packetDirection_;
89  clientID_ = p.clientID_;
90  if(p.data_){
91    data_ = new uint8_t[p.getSize()];
92    memcpy(data_, p.data_, p.getSize());
93  }else
94    data_=0;
95  bDataENetAllocated_ = p.bDataENetAllocated_;
96}
97
98/**
99@brief
100    Destroys a packet completely.
101
102    That also means destroying the ENetPacket if one exists. There
103*/
104Packet::~Packet(){
105  // Deallocate data_ memory if necessary.
106  if (this->bDataENetAllocated_){
107    // In this case ENet allocated data_ and will destroy it.
108  }
109  else if (this->data_) {
110    // This destructor was probably called as a consequence of ENet executing our callback.
111    // It simply serves us to be able to deallocate the packet content (data_) ourselves since
112    // we have created it in the first place.
113    delete[] this->data_;
114  }
115
116  // Destroy the ENetPacket if necessary.
117  // Note: For the case ENet used the callback to destroy the packet, we have already set
118  // enetPacket_ to NULL to avoid destroying it again.
119  if (this->enetPacket_){
120    // enetPacket_->data gets destroyed too by ENet if it was allocated by it.
121    enet_packet_destroy(enetPacket_);
122  }
123}
124
125bool Packet::send(){
126  if(packetDirection_ != Direction::Outgoing && packetDirection_ != Direction::Bidirectional ){
127    assert(0);
128    return false;
129  }
130  if(!enetPacket_){
131    if(!data_){
132      assert(0);
133      return false;
134    }
135    // We deliver ENet the data address so that it doesn't memcpy everything again.
136    // --> We have to delete data_ ourselves!
137    enetPacket_ = enet_packet_create(getData(), getSize(), getFlags());
138    enetPacket_->freeCallback = &Packet::deletePacket;
139    // Add the packet to a global list so we can access it again once enet calls our
140    // deletePacket method. We can of course only give a one argument function to the ENet C library.
141    {
142      // Assures we don't create a packet and destroy it right after in another thread
143      // without having a reference in the packetMap_
144      packetMap_[reinterpret_cast<size_t>(enetPacket_)] = this;
145    }
146  }
147#ifndef NDEBUG
148  switch( *(Type::Value *)(data_ + _PACKETID) )
149  {
150    case Type::Acknowledgement:
151    case Type::Chat:
152    case Type::ClassID:
153    case Type::Gamestate:
154    case Type::Welcome:
155    case Type::DeleteObjects:
156    case Type::FunctionIDs:
157    case Type::FunctionCalls:
158      break;
159    default:
160      assert(0); //there was some error, if this is the case
161      break;
162  }
163#endif
164//  ENetPacket *temp = enetPacket_;
165//  enetPacket_ = 0; // otherwise we have a double free because enet already handles the deallocation of the packet
166  if(!Host::addPacket( enetPacket_, clientID_))
167    enet_packet_destroy(this->enetPacket_); // if we could not add the packet to the enet queue delete it manually
168  return true;
169}
170
171Packet *Packet::createPacket(ENetPacket *packet, ENetPeer *peer){
172  uint8_t *data = packet->data;
173  assert(ClientInformation::findClient(&peer->address)->getID() != static_cast<unsigned int>(-2) || !Host::isServer());
174  unsigned int clientID = ClientInformation::findClient(&peer->address)->getID();
175  Packet *p = 0;
176  COUT(6) << "packet type: " << *(Type::Value *)&data[_PACKETID] << std::endl;
177  switch( *(Type::Value *)(data + _PACKETID) )
178  {
179    case Type::Acknowledgement:
180      COUT(5) << "ack" << std::endl;
181      p = new Acknowledgement( data, clientID );
182      break;
183    case Type::Chat:
184      COUT(5) << "chat" << std::endl;
185      p = new Chat( data, clientID );
186      break;
187    case Type::ClassID:
188      COUT(5) << "classid" << std::endl;
189      p = new ClassID( data, clientID );
190      break;
191    case Type::Gamestate:
192      COUT(5) << "gamestate" << std::endl;
193      // TODO: remove brackets
194      p = new Gamestate( data, clientID );
195      break;
196    case Type::Welcome:
197      COUT(5) << "welcome" << std::endl;
198      p = new Welcome( data, clientID );
199      break;
200    case Type::DeleteObjects:
201      COUT(5) << "deleteobjects" << std::endl;
202      p = new DeleteObjects( data, clientID );
203      break;
204    case Type::FunctionCalls:
205      COUT(5) << "functionCalls" << std::endl;
206      p = new FunctionCalls( data, clientID );
207      break;
208    case Type::FunctionIDs:
209      COUT(5) << "functionIDs" << std::endl;
210      p = new FunctionIDs( data, clientID );
211      break;
212    default:
213      assert(0); //TODO: repair this
214      break;
215  }
216
217  // Data was created by ENet
218  p->bDataENetAllocated_ = true;
219  p->enetPacket_ = packet;
220
221  return p;
222}
223
224/**
225@brief
226    ENet calls this method whenever it wants to destroy a packet that contains
227    data we allocated ourselves.
228*/
229void Packet::deletePacket(ENetPacket *enetPacket){
230  // Get our Packet from a global map with all Packets created in the send() method of Packet.
231  std::map<size_t, Packet*>::iterator it = packetMap_.find(reinterpret_cast<size_t>(enetPacket));
232  assert(it != packetMap_.end());
233  // Make sure we don't delete it again in the destructor
234  it->second->enetPacket_ = 0;
235  delete it->second;
236  packetMap_.erase(it);
237  COUT(6) << "PacketMap size: " << packetMap_.size() << std::endl;
238}
239
240} // namespace packet
241
242} // namespace orxonox
243
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