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source: code/branches/lodfinal/src/network/packet/Packet.cc @ 2862

Last change on this file since 2862 was 2171, checked in by landauf, 16 years ago

merged revisions 2111-2170 from objecthierarchy branch back to trunk.

  • Property svn:eol-style set to native
File size: 6.6 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 <enet/enet.h>
34#include <boost/bind.hpp>
35
36#include "network/ConnectionManager.h"
37#include "network/ClientInformation.h"
38
39#include "Acknowledgement.h"
40#include "Chat.h"
41#include "ClassID.h"
42#include "Gamestate.h"
43#include "Welcome.h"
44#include "DeleteObjects.h"
45#include "network/Host.h"
46#include "core/CoreIncludes.h"
47
48namespace orxonox{
49
50namespace packet{
51
52#define PACKET_FLAG_DEFAULT ENET_PACKET_FLAG_NO_ALLOCATE
53#define _PACKETID           0
54
55std::map<size_t, Packet *> Packet::packetMap_;
56boost::recursive_mutex Packet::packetMap_mutex;
57
58Packet::Packet(){
59  flags_ = PACKET_FLAG_DEFAULT;
60  packetDirection_ = ENUM::Outgoing;
61  clientID_=0;
62  data_=0;
63  enetPacket_=0;
64  bDataENetAllocated_ = false;
65}
66
67void blub(ENetPacket *packet){
68  COUT(4) << "blubb" << std::endl;
69}
70
71Packet::Packet(uint8_t *data, unsigned int clientID){
72  flags_ = PACKET_FLAG_DEFAULT;
73  packetDirection_ = ENUM::Incoming;
74  clientID_=clientID;
75  data_=data;
76  enetPacket_=0;
77  bDataENetAllocated_ = false;
78}
79
80
81Packet::Packet(const Packet &p){
82  enetPacket_=p.enetPacket_;
83  flags_=p.flags_;
84  packetDirection_ = p.packetDirection_;
85  clientID_ = p.clientID_;
86  if(p.data_){
87    data_ = new uint8_t[p.getSize()];
88    memcpy(data_, p.data_, p.getSize());
89  }else
90    data_=0;
91  bDataENetAllocated_ = p.bDataENetAllocated_;
92}
93
94/**
95@brief
96    Destroys a packet completely.
97   
98    That also means destroying the ENetPacket if one exists. There
99*/
100Packet::~Packet(){
101  // Deallocate data_ memory if necessary.
102  if (this->bDataENetAllocated_){
103    // In this case ENet allocated data_ and will destroy it.
104  }
105  else if (this->data_) {
106    // This destructor was probably called as a consequence to ENet executing our callback.
107    // It simply serves us to be able to deallocate the packet content (data_) ourselves since
108    // we have created it in the first place.
109    delete[] this->data_;
110  }
111
112  // Destroy the ENetPacket if necessary.
113  // Note: For the case ENet used the callback to destroy the packet, we have already set
114  // enetPacket_ to NULL to avoid destroying it again.
115  if (this->enetPacket_){
116    // enetPacket_->data gets destroyed too by ENet if it was allocated by it.
117    enet_packet_destroy(enetPacket_);
118  }
119}
120
121bool Packet::send(){
122  if(packetDirection_ != ENUM::Outgoing && packetDirection_ != ENUM::Bidirectional ){
123    assert(0);
124    return false;
125  }
126  if(!enetPacket_){
127    if(!data_){
128      assert(0);
129      return false;
130    }
131    // Assures we don't create a packet and destroy it right after in another thread
132    // without having a reference in the packetMap_
133    boost::recursive_mutex::scoped_lock lock(Packet::packetMap_mutex);
134    // We deliver ENet the data address so that it doesn't memcpy everything again.
135    // --> We have to delete data_ ourselves!
136    enetPacket_ = enet_packet_create(getData(), getSize(), getFlags());
137    enetPacket_->freeCallback = &Packet::deletePacket;
138    // Add the packet to a global list so we can access it again once enet calls our
139    // deletePacket method. We can of course only give a one argument function to the ENet C library.
140    packetMap_[(size_t)(void*)enetPacket_] = this;
141  }
142#ifndef NDEBUG
143  switch( *(ENUM::Type *)(data_ + _PACKETID) )
144  {
145    case ENUM::Acknowledgement:
146    case ENUM::Chat:
147    case ENUM::ClassID:
148    case ENUM::Gamestate:
149    case ENUM::Welcome:
150    case ENUM::DeleteObjects:
151      break;
152    default:
153      assert(0); //there was some error, if this is the case
154      break;
155  }
156#endif
157//  ENetPacket *temp = enetPacket_;
158//  enetPacket_ = 0; // otherwise we have a double free because enet already handles the deallocation of the packet
159  Host::addPacket( enetPacket_, clientID_);
160  return true;
161}
162
163Packet *Packet::createPacket(ENetPacket *packet, ENetPeer *peer){
164  uint8_t *data = packet->data;
165  assert(ClientInformation::findClient(&peer->address)->getID() != (unsigned int)-2 || !Host::isServer());
166  unsigned int clientID = ClientInformation::findClient(&peer->address)->getID();
167  Packet *p;
168  COUT(5) << "packet type: " << *(ENUM::Type *)&data[_PACKETID] << std::endl;
169  switch( *(ENUM::Type *)(data + _PACKETID) )
170  {
171    case ENUM::Acknowledgement:
172      COUT(4) << "ack" << std::endl;
173      p = new Acknowledgement( data, clientID );
174      break;
175    case ENUM::Chat:
176      COUT(4) << "chat" << std::endl;
177      p = new Chat( data, clientID );
178      break;
179    case ENUM::ClassID:
180      COUT(4) << "classid" << std::endl;
181      p = new ClassID( data, clientID );
182      break;
183    case ENUM::Gamestate:
184      COUT(4) << "gamestate" << std::endl;
185      // TODO: remove brackets
186      p = new Gamestate( data, clientID );
187      break;
188    case ENUM::Welcome:
189      COUT(4) << "welcome" << std::endl;
190      p = new Welcome( data, clientID );
191      break;
192    case ENUM::DeleteObjects:
193      COUT(4) << "deleteobjects" << std::endl;
194      p = new DeleteObjects( data, clientID );
195      break;
196    default:
197      assert(0); //TODO: repair this
198      break;
199  }
200
201  // Data was created by ENet
202  p->bDataENetAllocated_ = true;
203
204  return p;
205}
206
207/**
208@brief
209    ENet calls this method whenever it wants to destroy a packet that contains
210    data we allocated ourselves.
211*/
212void Packet::deletePacket(ENetPacket *enetPacket){
213  boost::recursive_mutex::scoped_lock lock(Packet::packetMap_mutex);
214  // Get our Packet from a gloabal map with all Packets created in the send() method of Packet.
215  std::map<size_t, Packet*>::iterator it = packetMap_.find((size_t)enetPacket);
216  assert(it != packetMap_.end());
217  // Make sure we don't delete it again in the destructor
218  it->second->enetPacket_ = 0;
219  delete it->second;
220  packetMap_.erase(it);
221  COUT(4) << "PacketMap size: " << packetMap_.size() << std::endl;
222}
223
224} // namespace packet
225
226} // namespace orxonox
227
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