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->getNode(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 /*
 222         Serialization
 223 */
 224 // List relevant id-name pairs for ids in the block using nodedef
 225 // Renumbers the content IDs (starting at 0 and incrementing
 226 // use static memory requires about 65535 * sizeof(int) ram in order to be
 227 // sure we can handle all content ids. But it's absolutely worth it as it's
 228 // a speedup of 4 for one of the major time consuming functions on storing
 229 // mapblocks.
 230 static content_t getBlockNodeIdMapping_mapping[USHRT_MAX + 1];
 231 static void getBlockNodeIdMapping(NameIdMapping *nimap, MapNode *nodes,
 232         const NodeDefManager *nodedef)
 233 {
 234         memset(getBlockNodeIdMapping_mapping, 0xFF, (USHRT_MAX + 1) * sizeof(content_t));
 235
 236         std::set<content_t> unknown_contents;
 237         content_t id_counter = 0;
 238         for (u32 i = 0; i < MapBlock::nodecount; i++) {
 239                 content_t global_id = nodes[i].getContent();
 240                 content_t id = CONTENT_IGNORE;
 241
 242                 // Try to find an existing mapping
 243                 if (getBlockNodeIdMapping_mapping[global_id] != 0xFFFF) {
 244                         id = getBlockNodeIdMapping_mapping[global_id];
 245                 }
 246                 else
 247                 {
 248                         // We have to assign a new mapping
 249                         id = id_counter++;
 250                         getBlockNodeIdMapping_mapping[global_id] = id;
 251
 252                         const ContentFeatures &f = nodedef->get(global_id);
 253                         const std::string &name = f.name;
 254                         if (name.empty())
 255                                 unknown_contents.insert(global_id);
 256                         else
 257                                 nimap->set(id, name);
 258                 }
 259
 260                 // Update the MapNode
 261                 nodes[i].setContent(id);
 262         }
 263         for (u16 unknown_content : unknown_contents) {
 264                 errorstream << "getBlockNodeIdMapping(): IGNORING ERROR: "
 265                                 << "Name for node id " << unknown_content << " not known" << std::endl;
 266         }
 267 }
 268 // Correct ids in the block to match nodedef based on names.
 269 // Unknown ones are added to nodedef.
 270 // Will not update itself to match id-name pairs in nodedef.
 271 static void correctBlockNodeIds(const NameIdMapping *nimap, MapNode *nodes,
 272                 IGameDef *gamedef)
 273 {
 274         const NodeDefManager *nodedef = gamedef->ndef();
 275         // This means the block contains incorrect ids, and we contain
 276         // the information to convert those to names.
 277         // nodedef contains information to convert our names to globally
 278         // correct ids.
 279         std::unordered_set<content_t> unnamed_contents;
 280         std::unordered_set<std::string> unallocatable_contents;
 281
 282         bool previous_exists = false;
 283         content_t previous_local_id = CONTENT_IGNORE;
 284         content_t previous_global_id = CONTENT_IGNORE;
 285
 286         for (u32 i = 0; i < MapBlock::nodecount; i++) {
 287                 content_t local_id = nodes[i].getContent();
 288                 // If previous node local_id was found and same than before, don't lookup maps
 289                 // apply directly previous resolved id
 290                 // This permits to massively improve loading performance when nodes are similar
 291                 // example: default:air, default:stone are massively present
 292                 if (previous_exists && local_id == previous_local_id) {
 293                         nodes[i].setContent(previous_global_id);
 294                         continue;
 295                 }
 296
 297                 std::string name;
 298                 if (!nimap->getName(local_id, name)) {
 299                         unnamed_contents.insert(local_id);
 300                         previous_exists = false;
 301                         continue;
 302                 }
 303
 304                 content_t global_id;
 305                 if (!nodedef->getId(name, global_id)) {
 306                         global_id = gamedef->allocateUnknownNodeId(name);
 307                         if (global_id == CONTENT_IGNORE) {
 308                                 unallocatable_contents.insert(name);
 309                                 previous_exists = false;
 310                                 continue;
 311                         }
 312                 }
 313                 nodes[i].setContent(global_id);
 314
 315                 // Save previous node local_id & global_id result
 316                 previous_local_id = local_id;
 317                 previous_global_id = global_id;
 318                 previous_exists = true;
 319         }
 320
 321         for (const content_t c: unnamed_contents) {
 322                 errorstream << "correctBlockNodeIds(): IGNORING ERROR: "
 323                                 << "Block contains id " << c
 324                                 << " with no name mapping" << std::endl;
 325         }
 326         for (const std::string &node_name: unallocatable_contents) {
 327                 errorstream << "correctBlockNodeIds(): IGNORING ERROR: "
 328                                 << "Could not allocate global id for node name \""
 329                                 << node_name << "\"" << std::endl;
 330         }
 331 }
 332
 333 void MapBlock::serialize(std::ostream &os_compressed, u8 version, bool disk, int compression_level)
 334 {
 335         if(!ser_ver_supported(version))
 336                 throw VersionMismatchException("ERROR: MapBlock format not supported");
 337
 338         if (!data)
 339                 throw SerializationError("ERROR: Not writing dummy block.");
 340
 341         FATAL_ERROR_IF(version < SER_FMT_VER_LOWEST_WRITE, "Serialisation version error");
 342
 343         std::ostringstream os_raw(std::ios_base::binary);
 344         std::ostream &os = version >= 29 ? os_raw : os_compressed;
 345
 346         // First byte
 347         u8 flags = 0;
 348         if(is_underground)
 349                 flags |= 0x01;
 350         if(getDayNightDiff())
 351                 flags |= 0x02;
 352         if (!m_generated)
 353                 flags |= 0x08;
 354         writeU8(os, flags);
 355         if (version >= 27) {
 356                 writeU16(os, m_lighting_complete);
 357         }
 358
 359         /*
 360                 Bulk node data
 361         */
 362         NameIdMapping nimap;
 363         SharedBuffer<u8> buf;
 364         const u8 content_width = 2;
 365         const u8 params_width = 2;
 366         if(disk)
 367         {
 368                 MapNode *tmp_nodes = new MapNode[nodecount];
 369                 memcpy(tmp_nodes, data, nodecount * sizeof(MapNode));
 370                 getBlockNodeIdMapping(&nimap, tmp_nodes, m_gamedef->ndef());
 371
 372                 buf = MapNode::serializeBulk(version, tmp_nodes, nodecount,
 373                                 content_width, params_width);
 374                 delete[] tmp_nodes;
 375
 376                 // write timestamp and node/id mapping first
 377                 if (version >= 29) {
 378                         writeU32(os, getTimestamp());
 379
 380                         nimap.serialize(os);
 381                 }
 382         }
 383         else
 384         {
 385                 buf = MapNode::serializeBulk(version, data, nodecount,
 386                                 content_width, params_width);
 387         }
 388
 389         writeU8(os, content_width);
 390         writeU8(os, params_width);
 391         if (version >= 29) {
 392                 os.write(reinterpret_cast<char*>(*buf), buf.getSize());
 393         } else {
 394                 // prior to 29 node data was compressed individually
 395                 compress(buf, os, version, compression_level);
 396         }
 397
 398         /*
 399                 Node metadata
 400         */
 401         if (version >= 29) {
 402                 m_node_metadata.serialize(os, version, disk);
 403         } else {
 404                 // use os_raw from above to avoid allocating another stream object
 405                 m_node_metadata.serialize(os_raw, version, disk);
 406                 // prior to 29 node data was compressed individually
 407                 compress(os_raw.str(), os, version, compression_level);
 408         }
 409
 410         /*
 411                 Data that goes to disk, but not the network
 412         */
 413         if(disk)
 414         {
 415                 if(version <= 24){
 416                         // Node timers
 417                         m_node_timers.serialize(os, version);
 418                 }
 419
 420                 // Static objects
 421                 m_static_objects.serialize(os);
 422
 423                 if(version < 29){
 424                         // Timestamp
 425                         writeU32(os, getTimestamp());
 426
 427                         // Write block-specific node definition id mapping
 428                         nimap.serialize(os);
 429                 }
 430
 431                 if(version >= 25){
 432                         // Node timers
 433                         m_node_timers.serialize(os, version);
 434                 }
 435         }
 436
 437         if (version >= 29) {
 438                 // now compress the whole thing
 439                 compress(os_raw.str(), os_compressed, version, compression_level);
 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, 2); // version
 450 }
 451
 452 void MapBlock::deSerialize(std::istream &in_compressed, u8 version, bool disk)
 453 {
 454         if(!ser_ver_supported(version))
 455                 throw VersionMismatchException("ERROR: MapBlock format not supported");
 456
 457         TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())<<std::endl);
 458
 459         m_day_night_differs_expired = false;
 460
 461         if(version <= 21)
 462         {
 463                 deSerialize_pre22(in_compressed, version, disk);
 464                 return;
 465         }
 466
 467         // Decompress the whole block (version >= 29)
 468         std::stringstream in_raw(std::ios_base::binary | std::ios_base::in | std::ios_base::out);
 469         if (version >= 29)
 470                 decompress(in_compressed, in_raw, version);
 471         std::istream &is = version >= 29 ? in_raw : in_compressed;
 472
 473         u8 flags = readU8(is);
 474         is_underground = (flags & 0x01) != 0;
 475         m_day_night_differs = (flags & 0x02) != 0;
 476         if (version < 27)
 477                 m_lighting_complete = 0xFFFF;
 478         else
 479                 m_lighting_complete = readU16(is);
 480         m_generated = (flags & 0x08) == 0;
 481
 482         NameIdMapping nimap;
 483         if (disk && version >= 29) {
 484                 // Timestamp
 485                 TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 486                                 <<": Timestamp"<<std::endl);
 487                 setTimestampNoChangedFlag(readU32(is));
 488                 m_disk_timestamp = m_timestamp;
 489
 490                 // Node/id mapping
 491                 TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 492                                 <<": NameIdMapping"<<std::endl);
 493                 nimap.deSerialize(is);
 494         }
 495
 496         TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 497                         <<": Bulk node data"<<std::endl);
 498         u8 content_width = readU8(is);
 499         u8 params_width = readU8(is);
 500         if(content_width != 1 && content_width != 2)
 501                 throw SerializationError("MapBlock::deSerialize(): invalid content_width");
 502         if(params_width != 2)
 503                 throw SerializationError("MapBlock::deSerialize(): invalid params_width");
 504
 505         /*
 506                 Bulk node data
 507         */
 508         if (version >= 29) {
 509                 MapNode::deSerializeBulk(is, version, data, nodecount,
 510                         content_width, params_width);
 511         } else {
 512                 // use in_raw from above to avoid allocating another stream object
 513                 decompress(is, in_raw, version);
 514                 MapNode::deSerializeBulk(in_raw, version, data, nodecount,
 515                         content_width, params_width);
 516         }
 517
 518         /*
 519                 NodeMetadata
 520         */
 521         TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 522                         <<": Node metadata"<<std::endl);
 523         if (version >= 29) {
 524                 m_node_metadata.deSerialize(is, m_gamedef->idef());
 525         } else {
 526                 try {
 527                         // reuse in_raw
 528                         in_raw.str("");
 529                         in_raw.clear();
 530                         decompress(is, in_raw, version);
 531                         if (version >= 23)
 532                                 m_node_metadata.deSerialize(in_raw, m_gamedef->idef());
 533                         else
 534                                 content_nodemeta_deserialize_legacy(in_raw,
 535                                         &m_node_metadata, &m_node_timers,
 536                                         m_gamedef->idef());
 537                 } catch(SerializationError &e) {
 538                         warningstream<<"MapBlock::deSerialize(): Ignoring an error"
 539                                         <<" while deserializing node metadata at ("
 540                                         <<PP(getPos())<<": "<<e.what()<<std::endl;
 541                 }
 542         }
 543
 544         /*
 545                 Data that is only on disk
 546         */
 547         if(disk)
 548         {
 549                 // Node timers
 550                 if(version == 23){
 551                         // Read unused zero
 552                         readU8(is);
 553                 }
 554                 if(version == 24){
 555                         TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 556                                         <<": Node timers (ver==24)"<<std::endl);
 557                         m_node_timers.deSerialize(is, version);
 558                 }
 559
 560                 // Static objects
 561                 TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 562                                 <<": Static objects"<<std::endl);
 563                 m_static_objects.deSerialize(is);
 564
 565                 if(version < 29) {
 566                         // Timestamp
 567                         TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 568                                     <<": Timestamp"<<std::endl);
 569                         setTimestampNoChangedFlag(readU32(is));
 570                         m_disk_timestamp = m_timestamp;
 571
 572                         // Node/id mapping
 573                         TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 574                                     <<": NameIdMapping"<<std::endl);
 575                         nimap.deSerialize(is);
 576                 }
 577
 578                 // Dynamically re-set ids based on node names
 579                 correctBlockNodeIds(&nimap, data, m_gamedef);
 580
 581                 if(version >= 25){
 582                         TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 583                                         <<": Node timers (ver>=25)"<<std::endl);
 584                         m_node_timers.deSerialize(is, version);
 585                 }
 586         }
 587
 588         TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 589                         <<": Done."<<std::endl);
 590 }
 591
 592 void MapBlock::deSerializeNetworkSpecific(std::istream &is)
 593 {
 594         try {
 595                 readU8(is);
 596                 //const u8 version = readU8(is);
 597                 //if (version != 1)
 598                         //throw SerializationError("unsupported MapBlock version");
 599
 600         } catch(SerializationError &e) {
 601                 warningstream<<"MapBlock::deSerializeNetworkSpecific(): Ignoring an error"
 602                                 <<": "<<e.what()<<std::endl;
 603         }
 604 }
 605
 606 /*
 607         Legacy serialization
 608 */
 609
 610 void MapBlock::deSerialize_pre22(std::istream &is, u8 version, bool disk)
 611 {
 612         // Initialize default flags
 613         is_underground = false;
 614         m_day_night_differs = false;
 615         m_lighting_complete = 0xFFFF;
 616         m_generated = true;
 617
 618         // Make a temporary buffer
 619         u32 ser_length = MapNode::serializedLength(version);
 620         SharedBuffer<u8> databuf_nodelist(nodecount * ser_length);
 621
 622         // These have no compression
 623         if (version <= 3 || version == 5 || version == 6) {
 624                 char tmp;
 625                 is.read(&tmp, 1);
 626                 if (is.gcount() != 1)
 627                         throw SerializationError(std::string(FUNCTION_NAME)
 628                                 + ": not enough input data");
 629                 is_underground = tmp;
 630                 is.read((char *)*databuf_nodelist, nodecount * ser_length);
 631                 if ((u32)is.gcount() != nodecount * ser_length)
 632                         throw SerializationError(std::string(FUNCTION_NAME)
 633                                 + ": not enough input data");
 634         } else if (version <= 10) {
 635                 u8 t8;
 636                 is.read((char *)&t8, 1);
 637                 is_underground = t8;
 638
 639                 {
 640                         // Uncompress and set material data
 641                         std::ostringstream os(std::ios_base::binary);
 642                         decompress(is, os, version);
 643                         std::string s = os.str();
 644                         if (s.size() != nodecount)
 645                                 throw SerializationError(std::string(FUNCTION_NAME)
 646                                         + ": not enough input data");
 647                         for (u32 i = 0; i < s.size(); i++) {
 648                                 databuf_nodelist[i*ser_length] = s[i];
 649                         }
 650                 }
 651                 {
 652                         // Uncompress and set param data
 653                         std::ostringstream os(std::ios_base::binary);
 654                         decompress(is, os, version);
 655                         std::string s = os.str();
 656                         if (s.size() != nodecount)
 657                                 throw SerializationError(std::string(FUNCTION_NAME)
 658                                         + ": not enough input data");
 659                         for (u32 i = 0; i < s.size(); i++) {
 660                                 databuf_nodelist[i*ser_length + 1] = s[i];
 661                         }
 662                 }
 663
 664                 if (version >= 10) {
 665                         // Uncompress and set param2 data
 666                         std::ostringstream os(std::ios_base::binary);
 667                         decompress(is, os, version);
 668                         std::string s = os.str();
 669                         if (s.size() != nodecount)
 670                                 throw SerializationError(std::string(FUNCTION_NAME)
 671                                         + ": not enough input data");
 672                         for (u32 i = 0; i < s.size(); i++) {
 673                                 databuf_nodelist[i*ser_length + 2] = s[i];
 674                         }
 675                 }
 676         } else { // All other versions (10 to 21)
 677                 u8 flags;
 678                 is.read((char*)&flags, 1);
 679                 is_underground = (flags & 0x01) != 0;
 680                 m_day_night_differs = (flags & 0x02) != 0;
 681                 if(version >= 18)
 682                         m_generated = (flags & 0x08) == 0;
 683
 684                 // Uncompress data
 685                 std::ostringstream os(std::ios_base::binary);
 686                 decompress(is, os, version);
 687                 std::string s = os.str();
 688                 if (s.size() != nodecount * 3)
 689                         throw SerializationError(std::string(FUNCTION_NAME)
 690                                 + ": decompress resulted in size other than nodecount*3");
 691
 692                 // deserialize nodes from buffer
 693                 for (u32 i = 0; i < nodecount; i++) {
 694                         databuf_nodelist[i*ser_length] = s[i];
 695                         databuf_nodelist[i*ser_length + 1] = s[i+nodecount];
 696                         databuf_nodelist[i*ser_length + 2] = s[i+nodecount*2];
 697                 }
 698
 699                 /*
 700                         NodeMetadata
 701                 */
 702                 if (version >= 14) {
 703                         // Ignore errors
 704                         try {
 705                                 if (version <= 15) {
 706                                         std::string data = deSerializeString16(is);
 707                                         std::istringstream iss(data, std::ios_base::binary);
 708                                         content_nodemeta_deserialize_legacy(iss,
 709                                                 &m_node_metadata, &m_node_timers,
 710                                                 m_gamedef->idef());
 711                                 } else {
 712                                         //std::string data = deSerializeString32(is);
 713                                         std::ostringstream oss(std::ios_base::binary);
 714                                         decompressZlib(is, oss);
 715                                         std::istringstream iss(oss.str(), std::ios_base::binary);
 716                                         content_nodemeta_deserialize_legacy(iss,
 717                                                 &m_node_metadata, &m_node_timers,
 718                                                 m_gamedef->idef());
 719                                 }
 720                         } catch(SerializationError &e) {
 721                                 warningstream<<"MapBlock::deSerialize(): Ignoring an error"
 722                                                 <<" while deserializing node metadata"<<std::endl;
 723                         }
 724                 }
 725         }
 726
 727         // Deserialize node data
 728         for (u32 i = 0; i < nodecount; i++) {
 729                 data[i].deSerialize(&databuf_nodelist[i * ser_length], version);
 730         }
 731
 732         if (disk) {
 733                 /*
 734                         Versions up from 9 have block objects. (DEPRECATED)
 735                 */
 736                 if (version >= 9) {
 737                         u16 count = readU16(is);
 738                         // Not supported and length not known if count is not 0
 739                         if(count != 0){
 740                                 warningstream<<"MapBlock::deSerialize_pre22(): "
 741                                                 <<"Ignoring stuff coming at and after MBOs"<<std::endl;
 742                                 return;
 743                         }
 744                 }
 745
 746                 /*
 747                         Versions up from 15 have static objects.
 748                 */
 749                 if (version >= 15)
 750                         m_static_objects.deSerialize(is);
 751
 752                 // Timestamp
 753                 if (version >= 17) {
 754                         setTimestampNoChangedFlag(readU32(is));
 755                         m_disk_timestamp = m_timestamp;
 756                 } else {
 757                         setTimestampNoChangedFlag(BLOCK_TIMESTAMP_UNDEFINED);
 758                 }
 759
 760                 // Dynamically re-set ids based on node names
 761                 NameIdMapping nimap;
 762                 // If supported, read node definition id mapping
 763                 if (version >= 21) {
 764                         nimap.deSerialize(is);
 765                 // Else set the legacy mapping
 766                 } else {
 767                         content_mapnode_get_name_id_mapping(&nimap);
 768                 }
 769                 correctBlockNodeIds(&nimap, data, m_gamedef);
 770         }
 771
 772
 773         // Legacy data changes
 774         // This code has to convert from pre-22 to post-22 format.
 775         const NodeDefManager *nodedef = m_gamedef->ndef();
 776         for(u32 i=0; i<nodecount; i++)
 777         {
 778                 const ContentFeatures &f = nodedef->get(data[i].getContent());
 779                 // Mineral
 780                 if(nodedef->getId("default:stone") == data[i].getContent()
 781                                 && data[i].getParam1() == 1)
 782                 {
 783                         data[i].setContent(nodedef->getId("default:stone_with_coal"));
 784                         data[i].setParam1(0);
 785                 }
 786                 else if(nodedef->getId("default:stone") == data[i].getContent()
 787                                 && data[i].getParam1() == 2)
 788                 {
 789                         data[i].setContent(nodedef->getId("default:stone_with_iron"));
 790                         data[i].setParam1(0);
 791                 }
 792                 // facedir_simple
 793                 if(f.legacy_facedir_simple)
 794                 {
 795                         data[i].setParam2(data[i].getParam1());
 796                         data[i].setParam1(0);
 797                 }
 798                 // wall_mounted
 799                 if(f.legacy_wallmounted)
 800                 {
 801                         u8 wallmounted_new_to_old[8] = {0x04, 0x08, 0x01, 0x02, 0x10, 0x20, 0, 0};
 802                         u8 dir_old_format = data[i].getParam2();
 803                         u8 dir_new_format = 0;
 804                         for(u8 j=0; j<8; j++)
 805                         {
 806                                 if((dir_old_format & wallmounted_new_to_old[j]) != 0)
 807                                 {
 808                                         dir_new_format = j;
 809                                         break;
 810                                 }
 811                         }
 812                         data[i].setParam2(dir_new_format);
 813                 }
 814         }
 815
 816 }
 817
 818 /*
 819         Get a quick string to describe what a block actually contains
 820 */
 821 std::string analyze_block(MapBlock *block)
 822 {
 823         if(block == NULL)
 824                 return "NULL";
 825
 826         std::ostringstream desc;
 827
 828         v3s16 p = block->getPos();
 829         char spos[25];
 830         porting::mt_snprintf(spos, sizeof(spos), "(%2d,%2d,%2d), ", p.X, p.Y, p.Z);
 831         desc<<spos;
 832
 833         switch(block->getModified())
 834         {
 835         case MOD_STATE_CLEAN:
 836                 desc<<"CLEAN,           ";
 837                 break;
 838         case MOD_STATE_WRITE_AT_UNLOAD:
 839                 desc<<"WRITE_AT_UNLOAD, ";
 840                 break;
 841         case MOD_STATE_WRITE_NEEDED:
 842                 desc<<"WRITE_NEEDED,    ";
 843                 break;
 844         default:
 845                 desc<<"unknown getModified()="+itos(block->getModified())+", ";
 846         }
 847
 848         if(block->isGenerated())
 849                 desc<<"is_gen [X], ";
 850         else
 851                 desc<<"is_gen [ ], ";
 852
 853         if(block->getIsUnderground())
 854                 desc<<"is_ug [X], ";
 855         else
 856                 desc<<"is_ug [ ], ";
 857
 858         desc<<"lighting_complete: "<<block->getLightingComplete()<<", ";
 859
 860         if(block->isDummy())
 861         {
 862                 desc<<"Dummy, ";
 863         }
 864         else
 865         {
 866                 bool full_ignore = true;
 867                 bool some_ignore = false;
 868                 bool full_air = true;
 869                 bool some_air = false;
 870                 for(s16 z0=0; z0<MAP_BLOCKSIZE; z0++)
 871                 for(s16 y0=0; y0<MAP_BLOCKSIZE; y0++)
 872                 for(s16 x0=0; x0<MAP_BLOCKSIZE; x0++)
 873                 {
 874                         v3s16 p(x0,y0,z0);
 875                         MapNode n = block->getNodeNoEx(p);
 876                         content_t c = n.getContent();
 877                         if(c == CONTENT_IGNORE)
 878                                 some_ignore = true;
 879                         else
 880                                 full_ignore = false;
 881                         if(c == CONTENT_AIR)
 882                                 some_air = true;
 883                         else
 884                                 full_air = false;
 885                 }
 886
 887                 desc<<"content {";
 888
 889                 std::ostringstream ss;
 890
 891                 if(full_ignore)
 892                         ss<<"IGNORE (full), ";
 893                 else if(some_ignore)
 894                         ss<<"IGNORE, ";
 895
 896                 if(full_air)
 897                         ss<<"AIR (full), ";
 898                 else if(some_air)
 899                         ss<<"AIR, ";
 900
 901                 if(ss.str().size()>=2)
 902                         desc<<ss.str().substr(0, ss.str().size()-2);
 903
 904                 desc<<"}, ";
 905         }
 906
 907         return desc.str().substr(0, desc.str().size()-2);
 908 }
 909
 910
 911 //END