src/mapblock.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2013 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 Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser 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 "mapblock.h"
  21
  22 #include <sstream>
  23 #include "map.h"
  24 #include "light.h"
  25 #include "nodedef.h"
  26 #include "nodemetadata.h"
  27 #include "gamedef.h"
  28 #include "log.h"
  29 #include "nameidmapping.h"
  30 #include "content_mapnode.h" // For legacy name-id mapping
  31 #include "content_nodemeta.h" // For legacy deserialization
  32 #include "serialization.h"
  33 #ifndef SERVER
  34 #include "client/mapblock_mesh.h"
  35 #endif
  36 #include "porting.h"
  37 #include "util/string.h"
  38 #include "util/serialize.h"
  39 #include "util/basic_macros.h"
  40
  41 static const char *modified_reason_strings[] = {
  42         "initial",
  43         "reallocate",
  44         "setIsUnderground",
  45         "setLightingExpired",
  46         "setGenerated",
  47         "setNode",
  48         "setNodeNoCheck",
  49         "setTimestamp",
  50         "NodeMetaRef::reportMetadataChange",
  51         "clearAllObjects",
  52         "Timestamp expired (step)",
  53         "addActiveObjectRaw",
  54         "removeRemovedObjects/remove",
  55         "removeRemovedObjects/deactivate",
  56         "Stored list cleared in activateObjects due to overflow",
  57         "deactivateFarObjects: Static data moved in",
  58         "deactivateFarObjects: Static data moved out",
  59         "deactivateFarObjects: Static data changed considerably",
  60         "finishBlockMake: expireDayNightDiff",
  61         "unknown",
  62 };
  63
  64
  65 /*
  66         MapBlock
  67 */
  68
  69 MapBlock::MapBlock(Map *parent, v3s16 pos, IGameDef *gamedef, bool dummy):
  70                 m_parent(parent),
  71                 m_pos(pos),
  72                 m_pos_relative(pos * MAP_BLOCKSIZE),
  73                 m_gamedef(gamedef)
  74 {
  75         if (!dummy)
  76                 reallocate();
  77 }
  78
  79 MapBlock::~MapBlock()
  80 {
  81 #ifndef SERVER
  82         {
  83                 delete mesh;
  84                 mesh = nullptr;
  85         }
  86 #endif
  87
  88         delete[] data;
  89 }
  90
  91 bool MapBlock::isValidPositionParent(v3s16 p)
  92 {
  93         if (isValidPosition(p)) {
  94                 return true;
  95         }
  96
  97         return m_parent->isValidPosition(getPosRelative() + p);
  98 }
  99
 100 MapNode MapBlock::getNodeParent(v3s16 p, bool *is_valid_position)
 101 {
 102         if (!isValidPosition(p))
 103                 return m_parent->getNodeNoEx(getPosRelative() + p, is_valid_position);
 104
 105         if (!data) {
 106                 if (is_valid_position)
 107                         *is_valid_position = false;
 108                 return {CONTENT_IGNORE};
 109         }
 110         if (is_valid_position)
 111                 *is_valid_position = true;
 112         return data[p.Z * zstride + p.Y * ystride + p.X];
 113 }
 114
 115 std::string MapBlock::getModifiedReasonString()
 116 {
 117         std::string reason;
 118
 119         const u32 ubound = MYMIN(sizeof(m_modified_reason) * CHAR_BIT,
 120                 ARRLEN(modified_reason_strings));
 121
 122         for (u32 i = 0; i != ubound; i++) {
 123                 if ((m_modified_reason & (1 << i)) == 0)
 124                         continue;
 125
 126                 reason += modified_reason_strings[i];
 127                 reason += ", ";
 128         }
 129
 130         if (reason.length() > 2)
 131                 reason.resize(reason.length() - 2);
 132
 133         return reason;
 134 }
 135
 136
 137 void MapBlock::copyTo(VoxelManipulator &dst)
 138 {
 139         v3s16 data_size(MAP_BLOCKSIZE, MAP_BLOCKSIZE, MAP_BLOCKSIZE);
 140         VoxelArea data_area(v3s16(0,0,0), data_size - v3s16(1,1,1));
 141
 142         // Copy from data to VoxelManipulator
 143         dst.copyFrom(data, data_area, v3s16(0,0,0),
 144                         getPosRelative(), data_size);
 145 }
 146
 147 void MapBlock::copyFrom(VoxelManipulator &dst)
 148 {
 149         v3s16 data_size(MAP_BLOCKSIZE, MAP_BLOCKSIZE, MAP_BLOCKSIZE);
 150         VoxelArea data_area(v3s16(0,0,0), data_size - v3s16(1,1,1));
 151
 152         // Copy from VoxelManipulator to data
 153         dst.copyTo(data, data_area, v3s16(0,0,0),
 154                         getPosRelative(), data_size);
 155 }
 156
 157 void MapBlock::actuallyUpdateDayNightDiff()
 158 {
 159         const NodeDefManager *nodemgr = m_gamedef->ndef();
 160
 161         // Running this function un-expires m_day_night_differs
 162         m_day_night_differs_expired = false;
 163
 164         if (!data) {
 165                 m_day_night_differs = false;
 166                 return;
 167         }
 168
 169         bool differs = false;
 170
 171         /*
 172                 Check if any lighting value differs
 173         */
 174
 175         MapNode previous_n(CONTENT_IGNORE);
 176         for (u32 i = 0; i < nodecount; i++) {
 177                 MapNode n = data[i];
 178
 179                 // If node is identical to previous node, don't verify if it differs
 180                 if (n == previous_n)
 181                         continue;
 182
 183                 differs = !n.isLightDayNightEq(nodemgr);
 184                 if (differs)
 185                         break;
 186                 previous_n = n;
 187         }
 188
 189         /*
 190                 If some lighting values differ, check if the whole thing is
 191                 just air. If it is just air, differs = false
 192         */
 193         if (differs) {
 194                 bool only_air = true;
 195                 for (u32 i = 0; i < nodecount; i++) {
 196                         MapNode &n = data[i];
 197                         if (n.getContent() != CONTENT_AIR) {
 198                                 only_air = false;
 199                                 break;
 200                         }
 201                 }
 202                 if (only_air)
 203                         differs = false;
 204         }
 205
 206         // Set member variable
 207         m_day_night_differs = differs;
 208 }
 209
 210 void MapBlock::expireDayNightDiff()
 211 {
 212         if (!data) {
 213                 m_day_night_differs = false;
 214                 m_day_night_differs_expired = false;
 215                 return;
 216         }
 217
 218         m_day_night_differs_expired = true;
 219 }
 220
 221 s16 MapBlock::getGroundLevel(v2s16 p2d)
 222 {
 223         if(isDummy())
 224                 return -3;
 225         try
 226         {
 227                 s16 y = MAP_BLOCKSIZE-1;
 228                 for(; y>=0; y--)
 229                 {
 230                         MapNode n = getNodeRef(p2d.X, y, p2d.Y);
 231                         if (m_gamedef->ndef()->get(n).walkable) {
 232                                 if(y == MAP_BLOCKSIZE-1)
 233                                         return -2;
 234
 235                                 return y;
 236                         }
 237                 }
 238                 return -1;
 239         }
 240         catch(InvalidPositionException &e)
 241         {
 242                 return -3;
 243         }
 244 }
 245
 246 /*
 247         Serialization
 248 */
 249 // List relevant id-name pairs for ids in the block using nodedef
 250 // Renumbers the content IDs (starting at 0 and incrementing
 251 // use static memory requires about 65535 * sizeof(int) ram in order to be
 252 // sure we can handle all content ids. But it's absolutely worth it as it's
 253 // a speedup of 4 for one of the major time consuming functions on storing
 254 // mapblocks.
 255 static content_t getBlockNodeIdMapping_mapping[USHRT_MAX + 1];
 256 static void getBlockNodeIdMapping(NameIdMapping *nimap, MapNode *nodes,
 257         const NodeDefManager *nodedef)
 258 {
 259         memset(getBlockNodeIdMapping_mapping, 0xFF, (USHRT_MAX + 1) * sizeof(content_t));
 260
 261         std::set<content_t> unknown_contents;
 262         content_t id_counter = 0;
 263         for (u32 i = 0; i < MapBlock::nodecount; i++) {
 264                 content_t global_id = nodes[i].getContent();
 265                 content_t id = CONTENT_IGNORE;
 266
 267                 // Try to find an existing mapping
 268                 if (getBlockNodeIdMapping_mapping[global_id] != 0xFFFF) {
 269                         id = getBlockNodeIdMapping_mapping[global_id];
 270                 }
 271                 else
 272                 {
 273                         // We have to assign a new mapping
 274                         id = id_counter++;
 275                         getBlockNodeIdMapping_mapping[global_id] = id;
 276
 277                         const ContentFeatures &f = nodedef->get(global_id);
 278                         const std::string &name = f.name;
 279                         if (name.empty())
 280                                 unknown_contents.insert(global_id);
 281                         else
 282                                 nimap->set(id, name);
 283                 }
 284
 285                 // Update the MapNode
 286                 nodes[i].setContent(id);
 287         }
 288         for (u16 unknown_content : unknown_contents) {
 289                 errorstream << "getBlockNodeIdMapping(): IGNORING ERROR: "
 290                                 << "Name for node id " << unknown_content << " not known" << std::endl;
 291         }
 292 }
 293 // Correct ids in the block to match nodedef based on names.
 294 // Unknown ones are added to nodedef.
 295 // Will not update itself to match id-name pairs in nodedef.
 296 static void correctBlockNodeIds(const NameIdMapping *nimap, MapNode *nodes,
 297                 IGameDef *gamedef)
 298 {
 299         const NodeDefManager *nodedef = gamedef->ndef();
 300         // This means the block contains incorrect ids, and we contain
 301         // the information to convert those to names.
 302         // nodedef contains information to convert our names to globally
 303         // correct ids.
 304         std::unordered_set<content_t> unnamed_contents;
 305         std::unordered_set<std::string> unallocatable_contents;
 306
 307         bool previous_exists = false;
 308         content_t previous_local_id = CONTENT_IGNORE;
 309         content_t previous_global_id = CONTENT_IGNORE;
 310
 311         for (u32 i = 0; i < MapBlock::nodecount; i++) {
 312                 content_t local_id = nodes[i].getContent();
 313                 // If previous node local_id was found and same than before, don't lookup maps
 314                 // apply directly previous resolved id
 315                 // This permits to massively improve loading performance when nodes are similar
 316                 // example: default:air, default:stone are massively present
 317                 if (previous_exists && local_id == previous_local_id) {
 318                         nodes[i].setContent(previous_global_id);
 319                         continue;
 320                 }
 321
 322                 std::string name;
 323                 if (!nimap->getName(local_id, name)) {
 324                         unnamed_contents.insert(local_id);
 325                         previous_exists = false;
 326                         continue;
 327                 }
 328
 329                 content_t global_id;
 330                 if (!nodedef->getId(name, global_id)) {
 331                         global_id = gamedef->allocateUnknownNodeId(name);
 332                         if (global_id == CONTENT_IGNORE) {
 333                                 unallocatable_contents.insert(name);
 334                                 previous_exists = false;
 335                                 continue;
 336                         }
 337                 }
 338                 nodes[i].setContent(global_id);
 339
 340                 // Save previous node local_id & global_id result
 341                 previous_local_id = local_id;
 342                 previous_global_id = global_id;
 343                 previous_exists = true;
 344         }
 345
 346         for (const content_t c: unnamed_contents) {
 347                 errorstream << "correctBlockNodeIds(): IGNORING ERROR: "
 348                                 << "Block contains id " << c
 349                                 << " with no name mapping" << std::endl;
 350         }
 351         for (const std::string &node_name: unallocatable_contents) {
 352                 errorstream << "correctBlockNodeIds(): IGNORING ERROR: "
 353                                 << "Could not allocate global id for node name \""
 354                                 << node_name << "\"" << std::endl;
 355         }
 356 }
 357
 358 void MapBlock::serialize(std::ostream &os, u8 version, bool disk)
 359 {
 360         if(!ser_ver_supported(version))
 361                 throw VersionMismatchException("ERROR: MapBlock format not supported");
 362
 363         if (!data)
 364                 throw SerializationError("ERROR: Not writing dummy block.");
 365
 366         FATAL_ERROR_IF(version < SER_FMT_VER_LOWEST_WRITE, "Serialisation version error");
 367
 368         // First byte
 369         u8 flags = 0;
 370         if(is_underground)
 371                 flags |= 0x01;
 372         if(getDayNightDiff())
 373                 flags |= 0x02;
 374         if (!m_generated)
 375                 flags |= 0x08;
 376         writeU8(os, flags);
 377         if (version >= 27) {
 378                 writeU16(os, m_lighting_complete);
 379         }
 380
 381         /*
 382                 Bulk node data
 383         */
 384         NameIdMapping nimap;
 385         if(disk)
 386         {
 387                 MapNode *tmp_nodes = new MapNode[nodecount];
 388                 for(u32 i=0; i<nodecount; i++)
 389                         tmp_nodes[i] = data[i];
 390                 getBlockNodeIdMapping(&nimap, tmp_nodes, m_gamedef->ndef());
 391
 392                 u8 content_width = 2;
 393                 u8 params_width = 2;
 394                 writeU8(os, content_width);
 395                 writeU8(os, params_width);
 396                 MapNode::serializeBulk(os, version, tmp_nodes, nodecount,
 397                                 content_width, params_width, true);
 398                 delete[] tmp_nodes;
 399         }
 400         else
 401         {
 402                 u8 content_width = 2;
 403                 u8 params_width = 2;
 404                 writeU8(os, content_width);
 405                 writeU8(os, params_width);
 406                 MapNode::serializeBulk(os, version, data, nodecount,
 407                                 content_width, params_width, true);
 408         }
 409
 410         /*
 411                 Node metadata
 412         */
 413         std::ostringstream oss(std::ios_base::binary);
 414         m_node_metadata.serialize(oss, version, disk);
 415         compressZlib(oss.str(), os);
 416
 417         /*
 418                 Data that goes to disk, but not the network
 419         */
 420         if(disk)
 421         {
 422                 if(version <= 24){
 423                         // Node timers
 424                         m_node_timers.serialize(os, version);
 425                 }
 426
 427                 // Static objects
 428                 m_static_objects.serialize(os);
 429
 430                 // Timestamp
 431                 writeU32(os, getTimestamp());
 432
 433                 // Write block-specific node definition id mapping
 434                 nimap.serialize(os);
 435
 436                 if(version >= 25){
 437                         // Node timers
 438                         m_node_timers.serialize(os, version);
 439                 }
 440         }
 441 }
 442
 443 void MapBlock::serializeNetworkSpecific(std::ostream &os)
 444 {
 445         if (!data) {
 446                 throw SerializationError("ERROR: Not writing dummy block.");
 447         }
 448
 449         writeU8(os, 1); // version
 450         writeF1000(os, 0); // deprecated heat
 451         writeF1000(os, 0); // deprecated humidity
 452 }
 453
 454 void MapBlock::deSerialize(std::istream &is, u8 version, bool disk)
 455 {
 456         if(!ser_ver_supported(version))
 457                 throw VersionMismatchException("ERROR: MapBlock format not supported");
 458
 459         TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())<<std::endl);
 460
 461         m_day_night_differs_expired = false;
 462
 463         if(version <= 21)
 464         {
 465                 deSerialize_pre22(is, version, disk);
 466                 return;
 467         }
 468
 469         u8 flags = readU8(is);
 470         is_underground = (flags & 0x01) != 0;
 471         m_day_night_differs = (flags & 0x02) != 0;
 472         if (version < 27)
 473                 m_lighting_complete = 0xFFFF;
 474         else
 475                 m_lighting_complete = readU16(is);
 476         m_generated = (flags & 0x08) == 0;
 477
 478         /*
 479                 Bulk node data
 480         */
 481         TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 482                         <<": Bulk node data"<<std::endl);
 483         u8 content_width = readU8(is);
 484         u8 params_width = readU8(is);
 485         if(content_width != 1 && content_width != 2)
 486                 throw SerializationError("MapBlock::deSerialize(): invalid content_width");
 487         if(params_width != 2)
 488                 throw SerializationError("MapBlock::deSerialize(): invalid params_width");
 489         MapNode::deSerializeBulk(is, version, data, nodecount,
 490                         content_width, params_width, true);
 491
 492         /*
 493                 NodeMetadata
 494         */
 495         TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 496                         <<": Node metadata"<<std::endl);
 497         // Ignore errors
 498         try {
 499                 std::ostringstream oss(std::ios_base::binary);
 500                 decompressZlib(is, oss);
 501                 std::istringstream iss(oss.str(), std::ios_base::binary);
 502                 if (version >= 23)
 503                         m_node_metadata.deSerialize(iss, m_gamedef->idef());
 504                 else
 505                         content_nodemeta_deserialize_legacy(iss,
 506                                 &m_node_metadata, &m_node_timers,
 507                                 m_gamedef->idef());
 508         } catch(SerializationError &e) {
 509                 warningstream<<"MapBlock::deSerialize(): Ignoring an error"
 510                                 <<" while deserializing node metadata at ("
 511                                 <<PP(getPos())<<": "<<e.what()<<std::endl;
 512         }
 513
 514         /*
 515                 Data that is only on disk
 516         */
 517         if(disk)
 518         {
 519                 // Node timers
 520                 if(version == 23){
 521                         // Read unused zero
 522                         readU8(is);
 523                 }
 524                 if(version == 24){
 525                         TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 526                                         <<": Node timers (ver==24)"<<std::endl);
 527                         m_node_timers.deSerialize(is, version);
 528                 }
 529
 530                 // Static objects
 531                 TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 532                                 <<": Static objects"<<std::endl);
 533                 m_static_objects.deSerialize(is);
 534
 535                 // Timestamp
 536                 TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 537                                 <<": Timestamp"<<std::endl);
 538                 setTimestamp(readU32(is));
 539                 m_disk_timestamp = m_timestamp;
 540
 541                 // Dynamically re-set ids based on node names
 542                 TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 543                                 <<": NameIdMapping"<<std::endl);
 544                 NameIdMapping nimap;
 545                 nimap.deSerialize(is);
 546                 correctBlockNodeIds(&nimap, data, m_gamedef);
 547
 548                 if(version >= 25){
 549                         TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 550                                         <<": Node timers (ver>=25)"<<std::endl);
 551                         m_node_timers.deSerialize(is, version);
 552                 }
 553         }
 554
 555         TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 556                         <<": Done."<<std::endl);
 557 }
 558
 559 void MapBlock::deSerializeNetworkSpecific(std::istream &is)
 560 {
 561         try {
 562                 int version = readU8(is);
 563                 //if(version != 1)
 564                 //      throw SerializationError("unsupported MapBlock version");
 565                 if(version >= 1) {
 566                         readF1000(is); // deprecated heat
 567                         readF1000(is); // deprecated humidity
 568                 }
 569         }
 570         catch(SerializationError &e)
 571         {
 572                 warningstream<<"MapBlock::deSerializeNetworkSpecific(): Ignoring an error"
 573                                 <<": "<<e.what()<<std::endl;
 574         }
 575 }
 576
 577 /*
 578         Legacy serialization
 579 */
 580
 581 void MapBlock::deSerialize_pre22(std::istream &is, u8 version, bool disk)
 582 {
 583         // Initialize default flags
 584         is_underground = false;
 585         m_day_night_differs = false;
 586         m_lighting_complete = 0xFFFF;
 587         m_generated = true;
 588
 589         // Make a temporary buffer
 590         u32 ser_length = MapNode::serializedLength(version);
 591         SharedBuffer<u8> databuf_nodelist(nodecount * ser_length);
 592
 593         // These have no compression
 594         if (version <= 3 || version == 5 || version == 6) {
 595                 char tmp;
 596                 is.read(&tmp, 1);
 597                 if (is.gcount() != 1)
 598                         throw SerializationError(std::string(FUNCTION_NAME)
 599                                 + ": not enough input data");
 600                 is_underground = tmp;
 601                 is.read((char *)*databuf_nodelist, nodecount * ser_length);
 602                 if ((u32)is.gcount() != nodecount * ser_length)
 603                         throw SerializationError(std::string(FUNCTION_NAME)
 604                                 + ": not enough input data");
 605         } else if (version <= 10) {
 606                 u8 t8;
 607                 is.read((char *)&t8, 1);
 608                 is_underground = t8;
 609
 610                 {
 611                         // Uncompress and set material data
 612                         std::ostringstream os(std::ios_base::binary);
 613                         decompress(is, os, version);
 614                         std::string s = os.str();
 615                         if (s.size() != nodecount)
 616                                 throw SerializationError(std::string(FUNCTION_NAME)
 617                                         + ": not enough input data");
 618                         for (u32 i = 0; i < s.size(); i++) {
 619                                 databuf_nodelist[i*ser_length] = s[i];
 620                         }
 621                 }
 622                 {
 623                         // Uncompress and set param data
 624                         std::ostringstream os(std::ios_base::binary);
 625                         decompress(is, os, version);
 626                         std::string s = os.str();
 627                         if (s.size() != nodecount)
 628                                 throw SerializationError(std::string(FUNCTION_NAME)
 629                                         + ": not enough input data");
 630                         for (u32 i = 0; i < s.size(); i++) {
 631                                 databuf_nodelist[i*ser_length + 1] = s[i];
 632                         }
 633                 }
 634
 635                 if (version >= 10) {
 636                         // Uncompress and set param2 data
 637                         std::ostringstream os(std::ios_base::binary);
 638                         decompress(is, os, version);
 639                         std::string s = os.str();
 640                         if (s.size() != nodecount)
 641                                 throw SerializationError(std::string(FUNCTION_NAME)
 642                                         + ": not enough input data");
 643                         for (u32 i = 0; i < s.size(); i++) {
 644                                 databuf_nodelist[i*ser_length + 2] = s[i];
 645                         }
 646                 }
 647         } else { // All other versions (10 to 21)
 648                 u8 flags;
 649                 is.read((char*)&flags, 1);
 650                 is_underground = (flags & 0x01) != 0;
 651                 m_day_night_differs = (flags & 0x02) != 0;
 652                 if(version >= 18)
 653                         m_generated = (flags & 0x08) == 0;
 654
 655                 // Uncompress data
 656                 std::ostringstream os(std::ios_base::binary);
 657                 decompress(is, os, version);
 658                 std::string s = os.str();
 659                 if (s.size() != nodecount * 3)
 660                         throw SerializationError(std::string(FUNCTION_NAME)
 661                                 + ": decompress resulted in size other than nodecount*3");
 662
 663                 // deserialize nodes from buffer
 664                 for (u32 i = 0; i < nodecount; i++) {
 665                         databuf_nodelist[i*ser_length] = s[i];
 666                         databuf_nodelist[i*ser_length + 1] = s[i+nodecount];
 667                         databuf_nodelist[i*ser_length + 2] = s[i+nodecount*2];
 668                 }
 669
 670                 /*
 671                         NodeMetadata
 672                 */
 673                 if (version >= 14) {
 674                         // Ignore errors
 675                         try {
 676                                 if (version <= 15) {
 677                                         std::string data = deSerializeString(is);
 678                                         std::istringstream iss(data, std::ios_base::binary);
 679                                         content_nodemeta_deserialize_legacy(iss,
 680                                                 &m_node_metadata, &m_node_timers,
 681                                                 m_gamedef->idef());
 682                                 } else {
 683                                         //std::string data = deSerializeLongString(is);
 684                                         std::ostringstream oss(std::ios_base::binary);
 685                                         decompressZlib(is, oss);
 686                                         std::istringstream iss(oss.str(), std::ios_base::binary);
 687                                         content_nodemeta_deserialize_legacy(iss,
 688                                                 &m_node_metadata, &m_node_timers,
 689                                                 m_gamedef->idef());
 690                                 }
 691                         } catch(SerializationError &e) {
 692                                 warningstream<<"MapBlock::deSerialize(): Ignoring an error"
 693                                                 <<" while deserializing node metadata"<<std::endl;
 694                         }
 695                 }
 696         }
 697
 698         // Deserialize node data
 699         for (u32 i = 0; i < nodecount; i++) {
 700                 data[i].deSerialize(&databuf_nodelist[i * ser_length], version);
 701         }
 702
 703         if (disk) {
 704                 /*
 705                         Versions up from 9 have block objects. (DEPRECATED)
 706                 */
 707                 if (version >= 9) {
 708                         u16 count = readU16(is);
 709                         // Not supported and length not known if count is not 0
 710                         if(count != 0){
 711                                 warningstream<<"MapBlock::deSerialize_pre22(): "
 712                                                 <<"Ignoring stuff coming at and after MBOs"<<std::endl;
 713                                 return;
 714                         }
 715                 }
 716
 717                 /*
 718                         Versions up from 15 have static objects.
 719                 */
 720                 if (version >= 15)
 721                         m_static_objects.deSerialize(is);
 722
 723                 // Timestamp
 724                 if (version >= 17) {
 725                         setTimestamp(readU32(is));
 726                         m_disk_timestamp = m_timestamp;
 727                 } else {
 728                         setTimestamp(BLOCK_TIMESTAMP_UNDEFINED);
 729                 }
 730
 731                 // Dynamically re-set ids based on node names
 732                 NameIdMapping nimap;
 733                 // If supported, read node definition id mapping
 734                 if (version >= 21) {
 735                         nimap.deSerialize(is);
 736                 // Else set the legacy mapping
 737                 } else {
 738                         content_mapnode_get_name_id_mapping(&nimap);
 739                 }
 740                 correctBlockNodeIds(&nimap, data, m_gamedef);
 741         }
 742
 743
 744         // Legacy data changes
 745         // This code has to convert from pre-22 to post-22 format.
 746         const NodeDefManager *nodedef = m_gamedef->ndef();
 747         for(u32 i=0; i<nodecount; i++)
 748         {
 749                 const ContentFeatures &f = nodedef->get(data[i].getContent());
 750                 // Mineral
 751                 if(nodedef->getId("default:stone") == data[i].getContent()
 752                                 && data[i].getParam1() == 1)
 753                 {
 754                         data[i].setContent(nodedef->getId("default:stone_with_coal"));
 755                         data[i].setParam1(0);
 756                 }
 757                 else if(nodedef->getId("default:stone") == data[i].getContent()
 758                                 && data[i].getParam1() == 2)
 759                 {
 760                         data[i].setContent(nodedef->getId("default:stone_with_iron"));
 761                         data[i].setParam1(0);
 762                 }
 763                 // facedir_simple
 764                 if(f.legacy_facedir_simple)
 765                 {
 766                         data[i].setParam2(data[i].getParam1());
 767                         data[i].setParam1(0);
 768                 }
 769                 // wall_mounted
 770                 if(f.legacy_wallmounted)
 771                 {
 772                         u8 wallmounted_new_to_old[8] = {0x04, 0x08, 0x01, 0x02, 0x10, 0x20, 0, 0};
 773                         u8 dir_old_format = data[i].getParam2();
 774                         u8 dir_new_format = 0;
 775                         for(u8 j=0; j<8; j++)
 776                         {
 777                                 if((dir_old_format & wallmounted_new_to_old[j]) != 0)
 778                                 {
 779                                         dir_new_format = j;
 780                                         break;
 781                                 }
 782                         }
 783                         data[i].setParam2(dir_new_format);
 784                 }
 785         }
 786
 787 }
 788
 789 /*
 790         Get a quick string to describe what a block actually contains
 791 */
 792 std::string analyze_block(MapBlock *block)
 793 {
 794         if(block == NULL)
 795                 return "NULL";
 796
 797         std::ostringstream desc;
 798
 799         v3s16 p = block->getPos();
 800         char spos[25];
 801         porting::mt_snprintf(spos, sizeof(spos), "(%2d,%2d,%2d), ", p.X, p.Y, p.Z);
 802         desc<<spos;
 803
 804         switch(block->getModified())
 805         {
 806         case MOD_STATE_CLEAN:
 807                 desc<<"CLEAN,           ";
 808                 break;
 809         case MOD_STATE_WRITE_AT_UNLOAD:
 810                 desc<<"WRITE_AT_UNLOAD, ";
 811                 break;
 812         case MOD_STATE_WRITE_NEEDED:
 813                 desc<<"WRITE_NEEDED,    ";
 814                 break;
 815         default:
 816                 desc<<"unknown getModified()="+itos(block->getModified())+", ";
 817         }
 818
 819         if(block->isGenerated())
 820                 desc<<"is_gen [X], ";
 821         else
 822                 desc<<"is_gen [ ], ";
 823
 824         if(block->getIsUnderground())
 825                 desc<<"is_ug [X], ";
 826         else
 827                 desc<<"is_ug [ ], ";
 828
 829         desc<<"lighting_complete: "<<block->getLightingComplete()<<", ";
 830
 831         if(block->isDummy())
 832         {
 833                 desc<<"Dummy, ";
 834         }
 835         else
 836         {
 837                 bool full_ignore = true;
 838                 bool some_ignore = false;
 839                 bool full_air = true;
 840                 bool some_air = false;
 841                 for(s16 z0=0; z0<MAP_BLOCKSIZE; z0++)
 842                 for(s16 y0=0; y0<MAP_BLOCKSIZE; y0++)
 843                 for(s16 x0=0; x0<MAP_BLOCKSIZE; x0++)
 844                 {
 845                         v3s16 p(x0,y0,z0);
 846                         MapNode n = block->getNodeNoEx(p);
 847                         content_t c = n.getContent();
 848                         if(c == CONTENT_IGNORE)
 849                                 some_ignore = true;
 850                         else
 851                                 full_ignore = false;
 852                         if(c == CONTENT_AIR)
 853                                 some_air = true;
 854                         else
 855                                 full_air = false;
 856                 }
 857
 858                 desc<<"content {";
 859
 860                 std::ostringstream ss;
 861
 862                 if(full_ignore)
 863                         ss<<"IGNORE (full), ";
 864                 else if(some_ignore)
 865                         ss<<"IGNORE, ";
 866
 867                 if(full_air)
 868                         ss<<"AIR (full), ";
 869                 else if(some_air)
 870                         ss<<"AIR, ";
 871
 872                 if(ss.str().size()>=2)
 873                         desc<<ss.str().substr(0, ss.str().size()-2);
 874
 875                 desc<<"}, ";
 876         }
 877
 878         return desc.str().substr(0, desc.str().size()-2);
 879 }
 880
 881
 882 //END