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
  28 /*
  29         NodeMetadata
  30 */
  31
  32 core::map<u16, NodeMetadata::Factory> NodeMetadata::m_types;
  33
  34 NodeMetadata::NodeMetadata()
  35 {
  36 }
  37
  38 NodeMetadata::~NodeMetadata()
  39 {
  40 }
  41
  42 NodeMetadata* NodeMetadata::deSerialize(std::istream &is)
  43 {
  44         // Read id
  45         u8 buf[2];
  46         is.read((char*)buf, 2);
  47         s16 id = readS16(buf);
  48
  49         // Read data
  50         std::string data = deSerializeString(is);
  51
  52         // Find factory function
  53         core::map<u16, Factory>::Node *n;
  54         n = m_types.find(id);
  55         if(n == NULL)
  56         {
  57                 // If factory is not found, just return.
  58                 dstream<<"WARNING: NodeMetadata: No factory for typeId="
  59                                 <<id<<std::endl;
  60                 return NULL;
  61         }
  62
  63         // Try to load the metadata. If it fails, just return.
  64         try
  65         {
  66                 std::istringstream iss(data, std::ios_base::binary);
  67
  68                 Factory f = n->getValue();
  69                 NodeMetadata *meta = (*f)(iss);
  70                 return meta;
  71         }
  72         catch(SerializationError &e)
  73         {
  74                 dstream<<"WARNING: NodeMetadata: ignoring SerializationError"<<std::endl;
  75                 return NULL;
  76         }
  77 }
  78
  79 void NodeMetadata::serialize(std::ostream &os)
  80 {
  81         u8 buf[2];
  82         writeU16(buf, typeId());
  83         os.write((char*)buf, 2);
  84
  85         std::ostringstream oss(std::ios_base::binary);
  86         serializeBody(oss);
  87         os<<serializeString(oss.str());
  88 }
  89
  90 void NodeMetadata::registerType(u16 id, Factory f)
  91 {
  92         core::map<u16, Factory>::Node *n;
  93         n = m_types.find(id);
  94         if(n)
  95                 return;
  96         m_types.insert(id, f);
  97 }
  98
  99 /*
 100         NodeMetadataList
 101 */
 102
 103 void NodeMetadataList::serialize(std::ostream &os)
 104 {
 105         u8 buf[6];
 106
 107         u16 version = 1;
 108         writeU16(buf, version);
 109         os.write((char*)buf, 2);
 110
 111         u16 count = m_data.size();
 112         writeU16(buf, count);
 113         os.write((char*)buf, 2);
 114
 115         for(core::map<v3s16, NodeMetadata*>::Iterator
 116                         i = m_data.getIterator();
 117                         i.atEnd()==false; i++)
 118         {
 119                 v3s16 p = i.getNode()->getKey();
 120                 NodeMetadata *data = i.getNode()->getValue();
 121
 122                 u16 p16 = p.Z*MAP_BLOCKSIZE*MAP_BLOCKSIZE + p.Y*MAP_BLOCKSIZE + p.X;
 123                 writeU16(buf, p16);
 124                 os.write((char*)buf, 2);
 125
 126                 data->serialize(os);
 127         }
 128
 129 }
 130 void NodeMetadataList::deSerialize(std::istream &is)
 131 {
 132         m_data.clear();
 133
 134         u8 buf[6];
 135
 136         is.read((char*)buf, 2);
 137         u16 version = readU16(buf);
 138
 139         if(version > 1)
 140         {
 141                 dstream<<__FUNCTION_NAME<<": version "<<version<<" not supported"
 142                                 <<std::endl;
 143                 throw SerializationError("NodeMetadataList::deSerialize");
 144         }
 145
 146         is.read((char*)buf, 2);
 147         u16 count = readU16(buf);
 148
 149         for(u16 i=0; i<count; i++)
 150         {
 151                 is.read((char*)buf, 2);
 152                 u16 p16 = readU16(buf);
 153
 154                 v3s16 p(0,0,0);
 155                 p.Z += p16 / MAP_BLOCKSIZE / MAP_BLOCKSIZE;
 156                 p16 -= p.Z * MAP_BLOCKSIZE * MAP_BLOCKSIZE;
 157                 p.Y += p16 / MAP_BLOCKSIZE;
 158                 p16 -= p.Y * MAP_BLOCKSIZE;
 159                 p.X += p16;
 160
 161                 NodeMetadata *data = NodeMetadata::deSerialize(is);
 162
 163                 if(data == NULL)
 164                         continue;
 165
 166                 if(m_data.find(p))
 167                 {
 168                         dstream<<"WARNING: NodeMetadataList::deSerialize(): "
 169                                         <<"already set data at position"
 170                                         <<"("<<p.X<<","<<p.Y<<","<<p.Z<<"): Ignoring."
 171                                         <<std::endl;
 172                         delete data;
 173                         continue;
 174                 }
 175
 176                 m_data.insert(p, data);
 177         }
 178 }
 179
 180 NodeMetadataList::~NodeMetadataList()
 181 {
 182         for(core::map<v3s16, NodeMetadata*>::Iterator
 183                         i = m_data.getIterator();
 184                         i.atEnd()==false; i++)
 185         {
 186                 delete i.getNode()->getValue();
 187         }
 188 }
 189
 190 NodeMetadata* NodeMetadataList::get(v3s16 p)
 191 {
 192         core::map<v3s16, NodeMetadata*>::Node *n;
 193         n = m_data.find(p);
 194         if(n == NULL)
 195                 return NULL;
 196         return n->getValue();
 197 }
 198
 199 void NodeMetadataList::remove(v3s16 p)
 200 {
 201         NodeMetadata *olddata = get(p);
 202         if(olddata)
 203         {
 204                 delete olddata;
 205                 m_data.remove(p);
 206         }
 207 }
 208
 209 void NodeMetadataList::set(v3s16 p, NodeMetadata *d)
 210 {
 211         remove(p);
 212         m_data.insert(p, d);
 213 }
 214
 215 bool NodeMetadataList::step(float dtime)
 216 {
 217         bool something_changed = false;
 218         for(core::map<v3s16, NodeMetadata*>::Iterator
 219                         i = m_data.getIterator();
 220                         i.atEnd()==false; i++)
 221         {
 222                 v3s16 p = i.getNode()->getKey();
 223                 NodeMetadata *meta = i.getNode()->getValue();
 224                 bool changed = meta->step(dtime);
 225                 if(changed)
 226                         something_changed = true;
 227         }
 228         return something_changed;
 229 }
 230