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()
  36 {
  37 }
  38
  39 NodeMetadata::~NodeMetadata()
  40 {
  41 }
  42
  43 NodeMetadata* NodeMetadata::deSerialize(std::istream &is)
  44 {
  45         // Read id
  46         u8 buf[2];
  47         is.read((char*)buf, 2);
  48         s16 id = readS16(buf);
  49
  50         // Read data
  51         std::string data = deSerializeString(is);
  52
  53         // Find factory function
  54         core::map<u16, Factory>::Node *n;
  55         n = m_types.find(id);
  56         if(n == NULL)
  57         {
  58                 // If factory is not found, just return.
  59                 infostream<<"WARNING: NodeMetadata: No factory for typeId="
  60                                 <<id<<std::endl;
  61                 return NULL;
  62         }
  63
  64         // Try to load the metadata. If it fails, just return.
  65         try
  66         {
  67                 std::istringstream iss(data, std::ios_base::binary);
  68
  69                 Factory f = n->getValue();
  70                 NodeMetadata *meta = (*f)(iss);
  71                 return meta;
  72         }
  73         catch(SerializationError &e)
  74         {
  75                 infostream<<"WARNING: NodeMetadata: ignoring SerializationError"<<std::endl;
  76                 return NULL;
  77         }
  78 }
  79
  80 void NodeMetadata::serialize(std::ostream &os)
  81 {
  82         u8 buf[2];
  83         writeU16(buf, typeId());
  84         os.write((char*)buf, 2);
  85
  86         std::ostringstream oss(std::ios_base::binary);
  87         serializeBody(oss);
  88         os<<serializeString(oss.str());
  89 }
  90
  91 void NodeMetadata::registerType(u16 id, Factory f)
  92 {
  93         core::map<u16, Factory>::Node *n;
  94         n = m_types.find(id);
  95         if(n)
  96                 return;
  97         m_types.insert(id, f);
  98 }
  99
 100 /*
 101         NodeMetadataList
 102 */
 103
 104 void NodeMetadataList::serialize(std::ostream &os)
 105 {
 106         u8 buf[6];
 107
 108         u16 version = 1;
 109         writeU16(buf, version);
 110         os.write((char*)buf, 2);
 111
 112         u16 count = m_data.size();
 113         writeU16(buf, count);
 114         os.write((char*)buf, 2);
 115
 116         for(core::map<v3s16, NodeMetadata*>::Iterator
 117                         i = m_data.getIterator();
 118                         i.atEnd()==false; i++)
 119         {
 120                 v3s16 p = i.getNode()->getKey();
 121                 NodeMetadata *data = i.getNode()->getValue();
 122
 123                 u16 p16 = p.Z*MAP_BLOCKSIZE*MAP_BLOCKSIZE + p.Y*MAP_BLOCKSIZE + p.X;
 124                 writeU16(buf, p16);
 125                 os.write((char*)buf, 2);
 126
 127                 data->serialize(os);
 128         }
 129
 130 }
 131 void NodeMetadataList::deSerialize(std::istream &is)
 132 {
 133         m_data.clear();
 134
 135         u8 buf[6];
 136
 137         is.read((char*)buf, 2);
 138         u16 version = readU16(buf);
 139
 140         if(version > 1)
 141         {
 142                 infostream<<__FUNCTION_NAME<<": version "<<version<<" not supported"
 143                                 <<std::endl;
 144                 throw SerializationError("NodeMetadataList::deSerialize");
 145         }
 146
 147         is.read((char*)buf, 2);
 148         u16 count = readU16(buf);
 149
 150         for(u16 i=0; i<count; i++)
 151         {
 152                 is.read((char*)buf, 2);
 153                 u16 p16 = readU16(buf);
 154
 155                 v3s16 p(0,0,0);
 156                 p.Z += p16 / MAP_BLOCKSIZE / MAP_BLOCKSIZE;
 157                 p16 -= p.Z * MAP_BLOCKSIZE * MAP_BLOCKSIZE;
 158                 p.Y += p16 / MAP_BLOCKSIZE;
 159                 p16 -= p.Y * MAP_BLOCKSIZE;
 160                 p.X += p16;
 161
 162                 NodeMetadata *data = NodeMetadata::deSerialize(is);
 163
 164                 if(data == NULL)
 165                         continue;
 166
 167                 if(m_data.find(p))
 168                 {
 169                         infostream<<"WARNING: NodeMetadataList::deSerialize(): "
 170                                         <<"already set data at position"
 171                                         <<"("<<p.X<<","<<p.Y<<","<<p.Z<<"): Ignoring."
 172                                         <<std::endl;
 173                         delete data;
 174                         continue;
 175                 }
 176
 177                 m_data.insert(p, data);
 178         }
 179 }
 180
 181 NodeMetadataList::~NodeMetadataList()
 182 {
 183         for(core::map<v3s16, NodeMetadata*>::Iterator
 184                         i = m_data.getIterator();
 185                         i.atEnd()==false; i++)
 186         {
 187                 delete i.getNode()->getValue();
 188         }
 189 }
 190
 191 NodeMetadata* NodeMetadataList::get(v3s16 p)
 192 {
 193         core::map<v3s16, NodeMetadata*>::Node *n;
 194         n = m_data.find(p);
 195         if(n == NULL)
 196                 return NULL;
 197         return n->getValue();
 198 }
 199
 200 void NodeMetadataList::remove(v3s16 p)
 201 {
 202         NodeMetadata *olddata = get(p);
 203         if(olddata)
 204         {
 205                 delete olddata;
 206                 m_data.remove(p);
 207         }
 208 }
 209
 210 void NodeMetadataList::set(v3s16 p, NodeMetadata *d)
 211 {
 212         remove(p);
 213         m_data.insert(p, d);
 214 }
 215
 216 bool NodeMetadataList::step(float dtime)
 217 {
 218         bool something_changed = false;
 219         for(core::map<v3s16, NodeMetadata*>::Iterator
 220                         i = m_data.getIterator();
 221                         i.atEnd()==false; i++)
 222         {
 223                 v3s16 p = i.getNode()->getKey();
 224                 NodeMetadata *meta = i.getNode()->getValue();
 225                 bool changed = meta->step(dtime);
 226                 if(changed)
 227                         something_changed = true;
 228         }
 229         return something_changed;
 230 }
 231