src/nodemetadata.cpp

   1 /*
   2 Minetest-c55
   3 Copyright (C) 2010-2011 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "nodemetadata.h"
  21 #include "utility.h"
  22 #include "mapnode.h"
  23 #include "exceptions.h"
  24 #include "inventory.h"
  25 #include <sstream>
  26 #include "content_mapnode.h"
  27 #include "log.h"
  28
  29 /*
  30         NodeMetadata
  31 */
  32
  33 core::map<u16, NodeMetadata::Factory> NodeMetadata::m_types;
  34
  35 NodeMetadata::NodeMetadata(IGameDef *gamedef):
  36         m_gamedef(gamedef)
  37 {
  38 }
  39
  40 NodeMetadata::~NodeMetadata()
  41 {
  42 }
  43
  44 NodeMetadata* NodeMetadata::deSerialize(std::istream &is, IGameDef *gamedef)
  45 {
  46         // Read id
  47         u8 buf[2];
  48         is.read((char*)buf, 2);
  49         s16 id = readS16(buf);
  50
  51         // Read data
  52         std::string data = deSerializeString(is);
  53
  54         // Find factory function
  55         core::map<u16, Factory>::Node *n;
  56         n = m_types.find(id);
  57         if(n == NULL)
  58         {
  59                 // If factory is not found, just return.
  60                 infostream<<"WARNING: NodeMetadata: No factory for typeId="
  61                                 <<id<<std::endl;
  62                 return NULL;
  63         }
  64
  65         // Try to load the metadata. If it fails, just return.
  66         try
  67         {
  68                 std::istringstream iss(data, std::ios_base::binary);
  69
  70                 Factory f = n->getValue();
  71                 NodeMetadata *meta = (*f)(iss, gamedef);
  72                 return meta;
  73         }
  74         catch(SerializationError &e)
  75         {
  76                 infostream<<"WARNING: NodeMetadata: ignoring SerializationError"<<std::endl;
  77                 return NULL;
  78         }
  79 }
  80
  81 void NodeMetadata::serialize(std::ostream &os)
  82 {
  83         u8 buf[2];
  84         writeU16(buf, typeId());
  85         os.write((char*)buf, 2);
  86
  87         std::ostringstream oss(std::ios_base::binary);
  88         serializeBody(oss);
  89         os<<serializeString(oss.str());
  90 }
  91
  92 void NodeMetadata::registerType(u16 id, Factory f)
  93 {
  94         core::map<u16, Factory>::Node *n;
  95         n = m_types.find(id);
  96         if(n)
  97                 return;
  98         m_types.insert(id, f);
  99 }
 100
 101 /*
 102         NodeMetadataList
 103 */
 104
 105 void NodeMetadataList::serialize(std::ostream &os)
 106 {
 107         u8 buf[6];
 108
 109         u16 version = 1;
 110         writeU16(buf, version);
 111         os.write((char*)buf, 2);
 112
 113         u16 count = m_data.size();
 114         writeU16(buf, count);
 115         os.write((char*)buf, 2);
 116
 117         for(core::map<v3s16, NodeMetadata*>::Iterator
 118                         i = m_data.getIterator();
 119                         i.atEnd()==false; i++)
 120         {
 121                 v3s16 p = i.getNode()->getKey();
 122                 NodeMetadata *data = i.getNode()->getValue();
 123
 124                 u16 p16 = p.Z*MAP_BLOCKSIZE*MAP_BLOCKSIZE + p.Y*MAP_BLOCKSIZE + p.X;
 125                 writeU16(buf, p16);
 126                 os.write((char*)buf, 2);
 127
 128                 data->serialize(os);
 129         }
 130
 131 }
 132 void NodeMetadataList::deSerialize(std::istream &is, IGameDef *gamedef)
 133 {
 134         m_data.clear();
 135
 136         u8 buf[6];
 137
 138         is.read((char*)buf, 2);
 139         u16 version = readU16(buf);
 140
 141         if(version > 1)
 142         {
 143                 infostream<<__FUNCTION_NAME<<": version "<<version<<" not supported"
 144                                 <<std::endl;
 145                 throw SerializationError("NodeMetadataList::deSerialize");
 146         }
 147
 148         is.read((char*)buf, 2);
 149         u16 count = readU16(buf);
 150
 151         for(u16 i=0; i<count; i++)
 152         {
 153                 is.read((char*)buf, 2);
 154                 u16 p16 = readU16(buf);
 155
 156                 v3s16 p(0,0,0);
 157                 p.Z += p16 / MAP_BLOCKSIZE / MAP_BLOCKSIZE;
 158                 p16 -= p.Z * MAP_BLOCKSIZE * MAP_BLOCKSIZE;
 159                 p.Y += p16 / MAP_BLOCKSIZE;
 160                 p16 -= p.Y * MAP_BLOCKSIZE;
 161                 p.X += p16;
 162
 163                 NodeMetadata *data = NodeMetadata::deSerialize(is, gamedef);
 164
 165                 if(data == NULL)
 166                         continue;
 167
 168                 if(m_data.find(p))
 169                 {
 170                         infostream<<"WARNING: NodeMetadataList::deSerialize(): "
 171                                         <<"already set data at position"
 172                                         <<"("<<p.X<<","<<p.Y<<","<<p.Z<<"): Ignoring."
 173                                         <<std::endl;
 174                         delete data;
 175                         continue;
 176                 }
 177
 178                 m_data.insert(p, data);
 179         }
 180 }
 181
 182 NodeMetadataList::~NodeMetadataList()
 183 {
 184         for(core::map<v3s16, NodeMetadata*>::Iterator
 185                         i = m_data.getIterator();
 186                         i.atEnd()==false; i++)
 187         {
 188                 delete i.getNode()->getValue();
 189         }
 190 }
 191
 192 NodeMetadata* NodeMetadataList::get(v3s16 p)
 193 {
 194         core::map<v3s16, NodeMetadata*>::Node *n;
 195         n = m_data.find(p);
 196         if(n == NULL)
 197                 return NULL;
 198         return n->getValue();
 199 }
 200
 201 void NodeMetadataList::remove(v3s16 p)
 202 {
 203         NodeMetadata *olddata = get(p);
 204         if(olddata)
 205         {
 206                 delete olddata;
 207                 m_data.remove(p);
 208         }
 209 }
 210
 211 void NodeMetadataList::set(v3s16 p, NodeMetadata *d)
 212 {
 213         remove(p);
 214         m_data.insert(p, d);
 215 }
 216
 217 bool NodeMetadataList::step(float dtime)
 218 {
 219         bool something_changed = false;
 220         for(core::map<v3s16, NodeMetadata*>::Iterator
 221                         i = m_data.getIterator();
 222                         i.atEnd()==false; i++)
 223         {
 224                 v3s16 p = i.getNode()->getKey();
 225                 NodeMetadata *meta = i.getNode()->getValue();
 226                 bool changed = meta->step(dtime);
 227                 if(changed)
 228                         something_changed = true;
 229         }
 230         return something_changed;
 231 }
 232