src/mapnode.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 "irrlichttypes_extrabloated.h"
  21 #include "mapnode.h"
  22 #include "porting.h"
  23 #include "nodedef.h"
  24 #include "content_mapnode.h" // For mapnode_translate_*_internal
  25 #include "serialization.h" // For ser_ver_supported
  26 #include "util/serialize.h"
  27 #include "log.h"
  28 #include "util/numeric.h"
  29 #include <string>
  30 #include <sstream>
  31
  32 static const Rotation wallmounted_to_rot[] = {
  33         ROTATE_0, ROTATE_180, ROTATE_90, ROTATE_270
  34 };
  35
  36 static const u8 rot_to_wallmounted[] = {
  37         2, 4, 3, 5
  38 };
  39
  40
  41 /*
  42         MapNode
  43 */
  44
  45 // Create directly from a nodename
  46 // If name is unknown, sets CONTENT_IGNORE
  47 MapNode::MapNode(INodeDefManager *ndef, const std::string &name,
  48                 u8 a_param1, u8 a_param2)
  49 {
  50         content_t id = CONTENT_IGNORE;
  51         ndef->getId(name, id);
  52         param0 = id;
  53         param1 = a_param1;
  54         param2 = a_param2;
  55 }
  56
  57 void MapNode::setLight(enum LightBank bank, u8 a_light, INodeDefManager *nodemgr)
  58 {
  59         // If node doesn't contain light data, ignore this
  60         if(nodemgr->get(*this).param_type != CPT_LIGHT)
  61                 return;
  62         if(bank == LIGHTBANK_DAY)
  63         {
  64                 param1 &= 0xf0;
  65                 param1 |= a_light & 0x0f;
  66         }
  67         else if(bank == LIGHTBANK_NIGHT)
  68         {
  69                 param1 &= 0x0f;
  70                 param1 |= (a_light & 0x0f)<<4;
  71         }
  72         else
  73                 assert("Invalid light bank" == NULL);
  74 }
  75
  76 bool MapNode::isLightDayNightEq(INodeDefManager *nodemgr) const
  77 {
  78         const ContentFeatures &f = nodemgr->get(*this);
  79         bool isEqual;
  80
  81         if (f.param_type == CPT_LIGHT) {
  82                 u8 day   = MYMAX(f.light_source, param1 & 0x0f);
  83                 u8 night = MYMAX(f.light_source, (param1 >> 4) & 0x0f);
  84                 isEqual = day == night;
  85         } else {
  86                 isEqual = true;
  87         }
  88
  89         return isEqual;
  90 }
  91
  92 u8 MapNode::getLight(enum LightBank bank, INodeDefManager *nodemgr) const
  93 {
  94         // Select the brightest of [light source, propagated light]
  95         const ContentFeatures &f = nodemgr->get(*this);
  96
  97         u8 light;
  98         if(f.param_type == CPT_LIGHT)
  99                 light = bank == LIGHTBANK_DAY ? param1 & 0x0f : (param1 >> 4) & 0x0f;
 100         else
 101                 light = 0;
 102
 103         return MYMAX(f.light_source, light);
 104 }
 105
 106 u8 MapNode::getLightNoChecks(enum LightBank bank, const ContentFeatures *f) const
 107 {
 108         return MYMAX(f->light_source,
 109                      bank == LIGHTBANK_DAY ? param1 & 0x0f : (param1 >> 4) & 0x0f);
 110 }
 111
 112 bool MapNode::getLightBanks(u8 &lightday, u8 &lightnight, INodeDefManager *nodemgr) const
 113 {
 114         // Select the brightest of [light source, propagated light]
 115         const ContentFeatures &f = nodemgr->get(*this);
 116         if(f.param_type == CPT_LIGHT)
 117         {
 118                 lightday = param1 & 0x0f;
 119                 lightnight = (param1>>4)&0x0f;
 120         }
 121         else
 122         {
 123                 lightday = 0;
 124                 lightnight = 0;
 125         }
 126         if(f.light_source > lightday)
 127                 lightday = f.light_source;
 128         if(f.light_source > lightnight)
 129                 lightnight = f.light_source;
 130         return f.param_type == CPT_LIGHT || f.light_source != 0;
 131 }
 132
 133 u8 MapNode::getFaceDir(INodeDefManager *nodemgr) const
 134 {
 135         const ContentFeatures &f = nodemgr->get(*this);
 136         if(f.param_type_2 == CPT2_FACEDIR)
 137                 return (getParam2() & 0x1F) % 24;
 138         return 0;
 139 }
 140
 141 u8 MapNode::getWallMounted(INodeDefManager *nodemgr) const
 142 {
 143         const ContentFeatures &f = nodemgr->get(*this);
 144         if(f.param_type_2 == CPT2_WALLMOUNTED)
 145                 return getParam2() & 0x07;
 146         return 0;
 147 }
 148
 149 v3s16 MapNode::getWallMountedDir(INodeDefManager *nodemgr) const
 150 {
 151         switch(getWallMounted(nodemgr))
 152         {
 153         case 0: default: return v3s16(0,1,0);
 154         case 1: return v3s16(0,-1,0);
 155         case 2: return v3s16(1,0,0);
 156         case 3: return v3s16(-1,0,0);
 157         case 4: return v3s16(0,0,1);
 158         case 5: return v3s16(0,0,-1);
 159         }
 160 }
 161
 162 void MapNode::rotateAlongYAxis(INodeDefManager *nodemgr, Rotation rot)
 163 {
 164         ContentParamType2 cpt2 = nodemgr->get(*this).param_type_2;
 165
 166         if (cpt2 == CPT2_FACEDIR) {
 167                 if (param2 >= 4)
 168                         return;
 169
 170                 u8 newrot = param2 & 3;
 171                 param2 &= ~3;
 172                 param2 |= (newrot + rot) & 3;
 173         } else if (cpt2 == CPT2_WALLMOUNTED) {
 174                 u8 wmountface = (param2 & 7);
 175                 if (wmountface <= 1)
 176                         return;
 177
 178                 Rotation oldrot = wallmounted_to_rot[wmountface - 2];
 179                 param2 &= ~7;
 180                 param2 |= rot_to_wallmounted[(oldrot - rot) & 3];
 181         }
 182 }
 183
 184 void MapNode::rotateAlongYAxisFull(INodeDefManager *nodemgr, Rotation rot)
 185 {
 186         ContentParamType2 cpt2 = nodemgr->get(*this).param_type_2;
 187
 188         if (cpt2 == CPT2_FACEDIR) {
 189                 static const u16 rotate_facedir[24 * 4] = {
 190                         // Table value = rotated facedir
 191                         // Columns: 0, 90, 180, 270 degrees rotation around vertical axis
 192                         // Rotation is anticlockwise as seen from above (+Y)
 193
 194                         0, 1, 2, 3,  // Initial facedir 0 to 3
 195                         1, 2, 3, 0,
 196                         2, 3, 0, 1,
 197                         3, 0, 1, 2,
 198
 199                         4, 13, 10, 19,  // 4 to 7
 200                         5, 14, 11, 16,
 201                         6, 15, 8, 17,
 202                         7, 12, 9, 18,
 203
 204                         8, 17, 6, 15,  // 8 to 11
 205                         9, 18, 7, 12,
 206                         10, 19, 4, 13,
 207                         11, 16, 5, 14,
 208
 209                         12, 9, 18, 7,  // 12 to 15
 210                         13, 10, 19, 4,
 211                         14, 11, 16, 5,
 212                         15, 8, 17, 6,
 213
 214                         16, 5, 14, 11,  // 16 to 19
 215                         17, 6, 15, 8,
 216                         18, 7, 12, 9,
 217                         19, 4, 13, 10,
 218
 219                         20, 23, 22, 21,  // 20 to 23
 220                         21, 20, 23, 22,
 221                         22, 21, 20, 23,
 222                         23, 22, 21, 20
 223                 };
 224                 u16 index = param2 * 4 + rot;
 225                 param2 = rotate_facedir[index];
 226         } else if (cpt2 == CPT2_WALLMOUNTED) {
 227                 u8 wmountface = (param2 & 7);
 228                 if (wmountface <= 1)
 229                         return;
 230
 231                 Rotation oldrot = wallmounted_to_rot[wmountface - 2];
 232                 param2 &= ~7;
 233                 param2 |= rot_to_wallmounted[(oldrot - rot) & 3];
 234         }
 235 }
 236
 237 static std::vector<aabb3f> transformNodeBox(const MapNode &n,
 238                 const NodeBox &nodebox, INodeDefManager *nodemgr)
 239 {
 240         std::vector<aabb3f> boxes;
 241         if(nodebox.type == NODEBOX_FIXED || nodebox.type == NODEBOX_LEVELED)
 242         {
 243                 const std::vector<aabb3f> &fixed = nodebox.fixed;
 244                 int facedir = n.getFaceDir(nodemgr);
 245                 u8 axisdir = facedir>>2;
 246                 facedir&=0x03;
 247                 for(std::vector<aabb3f>::const_iterator
 248                                 i = fixed.begin();
 249                                 i != fixed.end(); ++i)
 250                 {
 251                         aabb3f box = *i;
 252
 253                         if (nodebox.type == NODEBOX_LEVELED) {
 254                                 box.MaxEdge.Y = -BS/2 + BS*((float)1/LEVELED_MAX) * n.getLevel(nodemgr);
 255                         }
 256
 257                         switch (axisdir)
 258                         {
 259                         case 0:
 260                                 if(facedir == 1)
 261                                 {
 262                                         box.MinEdge.rotateXZBy(-90);
 263                                         box.MaxEdge.rotateXZBy(-90);
 264                                 }
 265                                 else if(facedir == 2)
 266                                 {
 267                                         box.MinEdge.rotateXZBy(180);
 268                                         box.MaxEdge.rotateXZBy(180);
 269                                 }
 270                                 else if(facedir == 3)
 271                                 {
 272                                         box.MinEdge.rotateXZBy(90);
 273                                         box.MaxEdge.rotateXZBy(90);
 274                                 }
 275                                 break;
 276                         case 1: // z+
 277                                 box.MinEdge.rotateYZBy(90);
 278                                 box.MaxEdge.rotateYZBy(90);
 279                                 if(facedir == 1)
 280                                 {
 281                                         box.MinEdge.rotateXYBy(90);
 282                                         box.MaxEdge.rotateXYBy(90);
 283                                 }
 284                                 else if(facedir == 2)
 285                                 {
 286                                         box.MinEdge.rotateXYBy(180);
 287                                         box.MaxEdge.rotateXYBy(180);
 288                                 }
 289                                 else if(facedir == 3)
 290                                 {
 291                                         box.MinEdge.rotateXYBy(-90);
 292                                         box.MaxEdge.rotateXYBy(-90);
 293                                 }
 294                                 break;
 295                         case 2: //z-
 296                                 box.MinEdge.rotateYZBy(-90);
 297                                 box.MaxEdge.rotateYZBy(-90);
 298                                 if(facedir == 1)
 299                                 {
 300                                         box.MinEdge.rotateXYBy(-90);
 301                                         box.MaxEdge.rotateXYBy(-90);
 302                                 }
 303                                 else if(facedir == 2)
 304                                 {
 305                                         box.MinEdge.rotateXYBy(180);
 306                                         box.MaxEdge.rotateXYBy(180);
 307                                 }
 308                                 else if(facedir == 3)
 309                                 {
 310                                         box.MinEdge.rotateXYBy(90);
 311                                         box.MaxEdge.rotateXYBy(90);
 312                                 }
 313                                 break;
 314                         case 3:  //x+
 315                                 box.MinEdge.rotateXYBy(-90);
 316                                 box.MaxEdge.rotateXYBy(-90);
 317                                 if(facedir == 1)
 318                                 {
 319                                         box.MinEdge.rotateYZBy(90);
 320                                         box.MaxEdge.rotateYZBy(90);
 321                                 }
 322                                 else if(facedir == 2)
 323                                 {
 324                                         box.MinEdge.rotateYZBy(180);
 325                                         box.MaxEdge.rotateYZBy(180);
 326                                 }
 327                                 else if(facedir == 3)
 328                                 {
 329                                         box.MinEdge.rotateYZBy(-90);
 330                                         box.MaxEdge.rotateYZBy(-90);
 331                                 }
 332                                 break;
 333                         case 4:  //x-
 334                                 box.MinEdge.rotateXYBy(90);
 335                                 box.MaxEdge.rotateXYBy(90);
 336                                 if(facedir == 1)
 337                                 {
 338                                         box.MinEdge.rotateYZBy(-90);
 339                                         box.MaxEdge.rotateYZBy(-90);
 340                                 }
 341                                 else if(facedir == 2)
 342                                 {
 343                                         box.MinEdge.rotateYZBy(180);
 344                                         box.MaxEdge.rotateYZBy(180);
 345                                 }
 346                                 else if(facedir == 3)
 347                                 {
 348                                         box.MinEdge.rotateYZBy(90);
 349                                         box.MaxEdge.rotateYZBy(90);
 350                                 }
 351                                 break;
 352                         case 5:
 353                                 box.MinEdge.rotateXYBy(-180);
 354                                 box.MaxEdge.rotateXYBy(-180);
 355                                 if(facedir == 1)
 356                                 {
 357                                         box.MinEdge.rotateXZBy(90);
 358                                         box.MaxEdge.rotateXZBy(90);
 359                                 }
 360                                 else if(facedir == 2)
 361                                 {
 362                                         box.MinEdge.rotateXZBy(180);
 363                                         box.MaxEdge.rotateXZBy(180);
 364                                 }
 365                                 else if(facedir == 3)
 366                                 {
 367                                         box.MinEdge.rotateXZBy(-90);
 368                                         box.MaxEdge.rotateXZBy(-90);
 369                                 }
 370                                 break;
 371                         default:
 372                                 break;
 373                         }
 374                         box.repair();
 375                         boxes.push_back(box);
 376                 }
 377         }
 378         else if(nodebox.type == NODEBOX_WALLMOUNTED)
 379         {
 380                 v3s16 dir = n.getWallMountedDir(nodemgr);
 381
 382                 // top
 383                 if(dir == v3s16(0,1,0))
 384                 {
 385                         boxes.push_back(nodebox.wall_top);
 386                 }
 387                 // bottom
 388                 else if(dir == v3s16(0,-1,0))
 389                 {
 390                         boxes.push_back(nodebox.wall_bottom);
 391                 }
 392                 // side
 393                 else
 394                 {
 395                         v3f vertices[2] =
 396                         {
 397                                 nodebox.wall_side.MinEdge,
 398                                 nodebox.wall_side.MaxEdge
 399                         };
 400
 401                         for(s32 i=0; i<2; i++)
 402                         {
 403                                 if(dir == v3s16(-1,0,0))
 404                                         vertices[i].rotateXZBy(0);
 405                                 if(dir == v3s16(1,0,0))
 406                                         vertices[i].rotateXZBy(180);
 407                                 if(dir == v3s16(0,0,-1))
 408                                         vertices[i].rotateXZBy(90);
 409                                 if(dir == v3s16(0,0,1))
 410                                         vertices[i].rotateXZBy(-90);
 411                         }
 412
 413                         aabb3f box = aabb3f(vertices[0]);
 414                         box.addInternalPoint(vertices[1]);
 415                         boxes.push_back(box);
 416                 }
 417         }
 418         else // NODEBOX_REGULAR
 419         {
 420                 boxes.push_back(aabb3f(-BS/2,-BS/2,-BS/2,BS/2,BS/2,BS/2));
 421         }
 422         return boxes;
 423 }
 424
 425 std::vector<aabb3f> MapNode::getNodeBoxes(INodeDefManager *nodemgr) const
 426 {
 427         const ContentFeatures &f = nodemgr->get(*this);
 428         return transformNodeBox(*this, f.node_box, nodemgr);
 429 }
 430
 431 std::vector<aabb3f> MapNode::getCollisionBoxes(INodeDefManager *nodemgr) const
 432 {
 433         const ContentFeatures &f = nodemgr->get(*this);
 434         if (f.collision_box.fixed.empty())
 435                 return transformNodeBox(*this, f.node_box, nodemgr);
 436         else
 437                 return transformNodeBox(*this, f.collision_box, nodemgr);
 438 }
 439
 440 std::vector<aabb3f> MapNode::getSelectionBoxes(INodeDefManager *nodemgr) const
 441 {
 442         const ContentFeatures &f = nodemgr->get(*this);
 443         return transformNodeBox(*this, f.selection_box, nodemgr);
 444 }
 445
 446 u8 MapNode::getMaxLevel(INodeDefManager *nodemgr) const
 447 {
 448         const ContentFeatures &f = nodemgr->get(*this);
 449         // todo: after update in all games leave only if (f.param_type_2 ==
 450         if( f.liquid_type == LIQUID_FLOWING || f.param_type_2 == CPT2_FLOWINGLIQUID)
 451                 return LIQUID_LEVEL_MAX;
 452         if(f.leveled || f.param_type_2 == CPT2_LEVELED)
 453                 return LEVELED_MAX;
 454         return 0;
 455 }
 456
 457 u8 MapNode::getLevel(INodeDefManager *nodemgr) const
 458 {
 459         const ContentFeatures &f = nodemgr->get(*this);
 460         // todo: after update in all games leave only if (f.param_type_2 ==
 461         if(f.liquid_type == LIQUID_SOURCE)
 462                 return LIQUID_LEVEL_SOURCE;
 463         if (f.param_type_2 == CPT2_FLOWINGLIQUID)
 464                 return getParam2() & LIQUID_LEVEL_MASK;
 465         if(f.liquid_type == LIQUID_FLOWING) // can remove if all param_type_2 setted
 466                 return getParam2() & LIQUID_LEVEL_MASK;
 467         if(f.leveled || f.param_type_2 == CPT2_LEVELED) {
 468                  u8 level = getParam2() & LEVELED_MASK;
 469                  if(level)
 470                         return level;
 471                  if(f.leveled > LEVELED_MAX)
 472                         return LEVELED_MAX;
 473                  return f.leveled; //default
 474         }
 475         return 0;
 476 }
 477
 478 u8 MapNode::setLevel(INodeDefManager *nodemgr, s8 level)
 479 {
 480         u8 rest = 0;
 481         if (level < 1) {
 482                 setContent(CONTENT_AIR);
 483                 return 0;
 484         }
 485         const ContentFeatures &f = nodemgr->get(*this);
 486         if (f.param_type_2 == CPT2_FLOWINGLIQUID
 487                 || f.liquid_type == LIQUID_FLOWING
 488                 || f.liquid_type == LIQUID_SOURCE) {
 489                 if (level >= LIQUID_LEVEL_SOURCE) {
 490                         rest = level - LIQUID_LEVEL_SOURCE;
 491                         setContent(nodemgr->getId(f.liquid_alternative_source));
 492                 } else {
 493                         setContent(nodemgr->getId(f.liquid_alternative_flowing));
 494                         setParam2(level & LIQUID_LEVEL_MASK);
 495                 }
 496         } else if (f.leveled || f.param_type_2 == CPT2_LEVELED) {
 497                 if (level > LEVELED_MAX) {
 498                         rest = level - LEVELED_MAX;
 499                         level = LEVELED_MAX;
 500                 }
 501                 setParam2(level & LEVELED_MASK);
 502         }
 503         return rest;
 504 }
 505
 506 u8 MapNode::addLevel(INodeDefManager *nodemgr, s8 add)
 507 {
 508         s8 level = getLevel(nodemgr);
 509         if (add == 0) level = 1;
 510         level += add;
 511         return setLevel(nodemgr, level);
 512 }
 513
 514 u32 MapNode::serializedLength(u8 version)
 515 {
 516         if(!ser_ver_supported(version))
 517                 throw VersionMismatchException("ERROR: MapNode format not supported");
 518
 519         if(version == 0)
 520                 return 1;
 521         else if(version <= 9)
 522                 return 2;
 523         else if(version <= 23)
 524                 return 3;
 525         else
 526                 return 4;
 527 }
 528 void MapNode::serialize(u8 *dest, u8 version)
 529 {
 530         if(!ser_ver_supported(version))
 531                 throw VersionMismatchException("ERROR: MapNode format not supported");
 532
 533         // Can't do this anymore; we have 16-bit dynamically allocated node IDs
 534         // in memory; conversion just won't work in this direction.
 535         if(version < 24)
 536                 throw SerializationError("MapNode::serialize: serialization to "
 537                                 "version < 24 not possible");
 538
 539         writeU16(dest+0, param0);
 540         writeU8(dest+2, param1);
 541         writeU8(dest+3, param2);
 542 }
 543 void MapNode::deSerialize(u8 *source, u8 version)
 544 {
 545         if(!ser_ver_supported(version))
 546                 throw VersionMismatchException("ERROR: MapNode format not supported");
 547
 548         if(version <= 21)
 549         {
 550                 deSerialize_pre22(source, version);
 551                 return;
 552         }
 553
 554         if(version >= 24){
 555                 param0 = readU16(source+0);
 556                 param1 = readU8(source+2);
 557                 param2 = readU8(source+3);
 558         }else{
 559                 param0 = readU8(source+0);
 560                 param1 = readU8(source+1);
 561                 param2 = readU8(source+2);
 562                 if(param0 > 0x7F){
 563                         param0 |= ((param2&0xF0)<<4);
 564                         param2 &= 0x0F;
 565                 }
 566         }
 567 }
 568 void MapNode::serializeBulk(std::ostream &os, int version,
 569                 const MapNode *nodes, u32 nodecount,
 570                 u8 content_width, u8 params_width, bool compressed)
 571 {
 572         if(!ser_ver_supported(version))
 573                 throw VersionMismatchException("ERROR: MapNode format not supported");
 574
 575         sanity_check(content_width == 2);
 576         sanity_check(params_width == 2);
 577
 578         // Can't do this anymore; we have 16-bit dynamically allocated node IDs
 579         // in memory; conversion just won't work in this direction.
 580         if(version < 24)
 581                 throw SerializationError("MapNode::serializeBulk: serialization to "
 582                                 "version < 24 not possible");
 583
 584         SharedBuffer<u8> databuf(nodecount * (content_width + params_width));
 585
 586         // Serialize content
 587         for(u32 i=0; i<nodecount; i++)
 588                 writeU16(&databuf[i*2], nodes[i].param0);
 589
 590         // Serialize param1
 591         u32 start1 = content_width * nodecount;
 592         for(u32 i=0; i<nodecount; i++)
 593                 writeU8(&databuf[start1 + i], nodes[i].param1);
 594
 595         // Serialize param2
 596         u32 start2 = (content_width + 1) * nodecount;
 597         for(u32 i=0; i<nodecount; i++)
 598                 writeU8(&databuf[start2 + i], nodes[i].param2);
 599
 600         /*
 601                 Compress data to output stream
 602         */
 603
 604         if(compressed)
 605         {
 606                 compressZlib(databuf, os);
 607         }
 608         else
 609         {
 610                 os.write((const char*) &databuf[0], databuf.getSize());
 611         }
 612 }
 613
 614 // Deserialize bulk node data
 615 void MapNode::deSerializeBulk(std::istream &is, int version,
 616                 MapNode *nodes, u32 nodecount,
 617                 u8 content_width, u8 params_width, bool compressed)
 618 {
 619         if(!ser_ver_supported(version))
 620                 throw VersionMismatchException("ERROR: MapNode format not supported");
 621
 622         if (version < 22
 623                         || (content_width != 1 && content_width != 2)
 624                         || params_width != 2)
 625                 FATAL_ERROR("Deserialize bulk node data error");
 626
 627         // Uncompress or read data
 628         u32 len = nodecount * (content_width + params_width);
 629         SharedBuffer<u8> databuf(len);
 630         if(compressed)
 631         {
 632                 std::ostringstream os(std::ios_base::binary);
 633                 decompressZlib(is, os);
 634                 std::string s = os.str();
 635                 if(s.size() != len)
 636                         throw SerializationError("deSerializeBulkNodes: "
 637                                         "decompress resulted in invalid size");
 638                 memcpy(&databuf[0], s.c_str(), len);
 639         }
 640         else
 641         {
 642                 is.read((char*) &databuf[0], len);
 643                 if(is.eof() || is.fail())
 644                         throw SerializationError("deSerializeBulkNodes: "
 645                                         "failed to read bulk node data");
 646         }
 647
 648         // Deserialize content
 649         if(content_width == 1)
 650         {
 651                 for(u32 i=0; i<nodecount; i++)
 652                         nodes[i].param0 = readU8(&databuf[i]);
 653         }
 654         else if(content_width == 2)
 655         {
 656                 for(u32 i=0; i<nodecount; i++)
 657                         nodes[i].param0 = readU16(&databuf[i*2]);
 658         }
 659
 660         // Deserialize param1
 661         u32 start1 = content_width * nodecount;
 662         for(u32 i=0; i<nodecount; i++)
 663                 nodes[i].param1 = readU8(&databuf[start1 + i]);
 664
 665         // Deserialize param2
 666         u32 start2 = (content_width + 1) * nodecount;
 667         if(content_width == 1)
 668         {
 669                 for(u32 i=0; i<nodecount; i++) {
 670                         nodes[i].param2 = readU8(&databuf[start2 + i]);
 671                         if(nodes[i].param0 > 0x7F){
 672                                 nodes[i].param0 <<= 4;
 673                                 nodes[i].param0 |= (nodes[i].param2&0xF0)>>4;
 674                                 nodes[i].param2 &= 0x0F;
 675                         }
 676                 }
 677         }
 678         else if(content_width == 2)
 679         {
 680                 for(u32 i=0; i<nodecount; i++)
 681                         nodes[i].param2 = readU8(&databuf[start2 + i]);
 682         }
 683 }
 684
 685 /*
 686         Legacy serialization
 687 */
 688 void MapNode::deSerialize_pre22(u8 *source, u8 version)
 689 {
 690         if(version <= 1)
 691         {
 692                 param0 = source[0];
 693         }
 694         else if(version <= 9)
 695         {
 696                 param0 = source[0];
 697                 param1 = source[1];
 698         }
 699         else
 700         {
 701                 param0 = source[0];
 702                 param1 = source[1];
 703                 param2 = source[2];
 704                 if(param0 > 0x7f){
 705                         param0 <<= 4;
 706                         param0 |= (param2&0xf0)>>4;
 707                         param2 &= 0x0f;
 708                 }
 709         }
 710
 711         // Convert special values from old version to new
 712         if(version <= 19)
 713         {
 714                 // In these versions, CONTENT_IGNORE and CONTENT_AIR
 715                 // are 255 and 254
 716                 // Version 19 is fucked up with sometimes the old values and sometimes not
 717                 if(param0 == 255)
 718                         param0 = CONTENT_IGNORE;
 719                 else if(param0 == 254)
 720                         param0 = CONTENT_AIR;
 721         }
 722
 723         // Translate to our known version
 724         *this = mapnode_translate_to_internal(*this, version);
 725 }