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/* encoding.c: Functions to read the level data.
*
* Copyright (C) 2001-2006 by Brian Raiter, under the GNU General Public
* License. No warranty. See COPYING for details.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "defs.h"
#include "state.h"
#include "err.h"
#include "encoding.h"
/* Read a 16-bit value, stored little-endian, from the level data
* stream.
*/
#define readword(p) ((p)[0] | ((p)[1] << 8))
/* Read an x-y coordinate pair from the level data stream. Ensure that
* an invalid x value always produces an invalid coordinate.
*/
#define readpos(x, y) (*(x) < CXGRID ? *(x) + CYGRID * *(y) : CXGRID*CYGRID)
/* Translation table for the codes used by the data file to define the
* initial state of a level.
*/
static int const fileids[] = {
/* 00 empty space */ Empty,
/* 01 wall */ Wall,
/* 02 chip */ ICChip,
/* 03 water */ Water,
/* 04 fire */ Fire,
/* 05 invisible wall, perm. */ HiddenWall_Perm,
/* 06 blocked north */ Wall_North,
/* 07 blocked west */ Wall_West,
/* 08 blocked south */ Wall_South,
/* 09 blocked east */ Wall_East,
/* 0A block */ Block_Static,
/* 0B dirt */ Dirt,
/* 0C ice */ Ice,
/* 0D force south */ Slide_South,
/* 0E cloning block N */ crtile(Block, NORTH),
/* 0F cloning block W */ crtile(Block, WEST),
/* 10 cloning block S */ crtile(Block, SOUTH),
/* 11 cloning block E */ crtile(Block, EAST),
/* 12 force north */ Slide_North,
/* 13 force east */ Slide_East,
/* 14 force west */ Slide_West,
/* 15 exit */ Exit,
/* 16 blue door */ Door_Blue,
/* 17 red door */ Door_Red,
/* 18 green door */ Door_Green,
/* 19 yellow door */ Door_Yellow,
/* 1A SE ice slide */ IceWall_Southeast,
/* 1B SW ice slide */ IceWall_Southwest,
/* 1C NW ice slide */ IceWall_Northwest,
/* 1D NE ice slide */ IceWall_Northeast,
/* 1E blue block, tile */ BlueWall_Fake,
/* 1F blue block, wall */ BlueWall_Real,
/* 20 not used */ Overlay_Buffer,
/* 21 thief */ Burglar,
/* 22 socket */ Socket,
/* 23 green button */ Button_Green,
/* 24 red button */ Button_Red,
/* 25 switch block, closed */ SwitchWall_Closed,
/* 26 switch block, open */ SwitchWall_Open,
/* 27 brown button */ Button_Brown,
/* 28 blue button */ Button_Blue,
/* 29 teleport */ Teleport,
/* 2A bomb */ Bomb,
/* 2B trap */ Beartrap,
/* 2C invisible wall, temp. */ HiddenWall_Temp,
/* 2D gravel */ Gravel,
/* 2E pass once */ PopupWall,
/* 2F hint */ HintButton,
/* 30 blocked SE */ Wall_Southeast,
/* 31 cloning machine */ CloneMachine,
/* 32 force all directions */ Slide_Random,
/* 33 drowning Chip */ Drowned_Chip,
/* 34 burned Chip */ Burned_Chip,
/* 35 burned Chip */ Bombed_Chip,
/* 36 not used */ HiddenWall_Perm,
/* 37 not used */ HiddenWall_Perm,
/* 38 not used */ HiddenWall_Perm,
/* 39 Chip in exit */ Exited_Chip,
/* 3A exit - end game */ Exit_Extra_1,
/* 3B exit - end game */ Exit_Extra_2,
/* 3C Chip swimming N */ crtile(Swimming_Chip, NORTH),
/* 3D Chip swimming W */ crtile(Swimming_Chip, WEST),
/* 3E Chip swimming S */ crtile(Swimming_Chip, SOUTH),
/* 3F Chip swimming E */ crtile(Swimming_Chip, EAST),
/* 40 Bug N */ crtile(Bug, NORTH),
/* 41 Bug W */ crtile(Bug, WEST),
/* 42 Bug S */ crtile(Bug, SOUTH),
/* 43 Bug E */ crtile(Bug, EAST),
/* 44 Fireball N */ crtile(Fireball, NORTH),
/* 45 Fireball W */ crtile(Fireball, WEST),
/* 46 Fireball S */ crtile(Fireball, SOUTH),
/* 47 Fireball E */ crtile(Fireball, EAST),
/* 48 Pink ball N */ crtile(Ball, NORTH),
/* 49 Pink ball W */ crtile(Ball, WEST),
/* 4A Pink ball S */ crtile(Ball, SOUTH),
/* 4B Pink ball E */ crtile(Ball, EAST),
/* 4C Tank N */ crtile(Tank, NORTH),
/* 4D Tank W */ crtile(Tank, WEST),
/* 4E Tank S */ crtile(Tank, SOUTH),
/* 4F Tank E */ crtile(Tank, EAST),
/* 50 Glider N */ crtile(Glider, NORTH),
/* 51 Glider W */ crtile(Glider, WEST),
/* 52 Glider S */ crtile(Glider, SOUTH),
/* 53 Glider E */ crtile(Glider, EAST),
/* 54 Teeth N */ crtile(Teeth, NORTH),
/* 55 Teeth W */ crtile(Teeth, WEST),
/* 56 Teeth S */ crtile(Teeth, SOUTH),
/* 57 Teeth E */ crtile(Teeth, EAST),
/* 58 Walker N */ crtile(Walker, NORTH),
/* 59 Walker W */ crtile(Walker, WEST),
/* 5A Walker S */ crtile(Walker, SOUTH),
/* 5B Walker E */ crtile(Walker, EAST),
/* 5C Blob N */ crtile(Blob, NORTH),
/* 5D Blob W */ crtile(Blob, WEST),
/* 5E Blob S */ crtile(Blob, SOUTH),
/* 5F Blob E */ crtile(Blob, EAST),
/* 60 Paramecium N */ crtile(Paramecium, NORTH),
/* 61 Paramecium W */ crtile(Paramecium, WEST),
/* 62 Paramecium S */ crtile(Paramecium, SOUTH),
/* 63 Paramecium E */ crtile(Paramecium, EAST),
/* 64 Blue key */ Key_Blue,
/* 65 Red key */ Key_Red,
/* 66 Green key */ Key_Green,
/* 67 Yellow key */ Key_Yellow,
/* 68 Flippers */ Boots_Water,
/* 69 Fire boots */ Boots_Fire,
/* 6A Ice skates */ Boots_Ice,
/* 6B Suction boots */ Boots_Slide,
/* 6C Chip N */ crtile(Chip, NORTH),
/* 6D Chip W */ crtile(Chip, WEST),
/* 6E Chip S */ crtile(Chip, SOUTH),
/* 6F Chip E */ crtile(Chip, EAST)
};
/* Initialize the gamestate by reading the level data, in MS dat-file
* format, from the state's setup.
*/
static int expandmsdatlevel(gamestate *state)
{
gamesetup *setup;
unsigned char const *data;
unsigned char const *dataend;
int size, pos, id;
int i, n;
memset(state->map, 0, sizeof state->map);
state->trapcount = 0;
state->clonercount = 0;
state->crlistcount = 0;
state->hinttext[0] = '\0';
setup = state->game;
if (setup->levelsize < 10)
goto badlevel;
data = setup->leveldata;
dataend = data + setup->levelsize;
if (readword(data) == 0)
goto badlevel;
state->chipsneeded = readword(data + 4);
if (readword(data + 6) > 1)
goto badlevel;
size = readword(data + 8);
data += 10;
if (data + size + 2 > dataend)
goto badlevel;
for (n = pos = 0 ; n < size && pos < CXGRID * CYGRID ; ++n) {
if (data[n] == 0xFF) {
i = data[++n];
id = data[++n];
} else {
i = 1;
id = data[n];
}
if (id >= (int)(sizeof fileids / sizeof *fileids)) {
id = Wall;
state->statusflags |= SF_BADTILES;
} else {
id = fileids[id];
}
while (i-- && pos < CXGRID * CYGRID)
state->map[pos++].top.id = id;
}
if (n < size)
warn("level %d: %d extra bytes in upper map layer",
setup->number, size - n);
else if (pos < CXGRID * CYGRID)
warn("level %d: %d missing bytes in upper map layer",
setup->number, CXGRID * CYGRID - pos);
data += size + 2;
size = readword(data - 2);
if (data + size > dataend)
goto badlevel;
for (n = pos = 0 ; n < size && pos < CXGRID * CYGRID ; ++n) {
if (data[n] == 0xFF) {
i = data[++n];
id = data[++n];
} else {
i = 1;
id = data[n];
}
if (id >= (int)(sizeof fileids / sizeof *fileids)) {
id = Wall;
state->statusflags |= SF_BADTILES;
} else {
id = fileids[id];
}
while (i-- && pos < CXGRID * CYGRID)
state->map[pos++].bot.id = id;
}
if (n < size)
warn("level %d: %d extra bytes in lower map layer",
setup->number, size - n);
else if (pos < CXGRID * CYGRID)
warn("level %d: %d missing bytes in lower map layer",
setup->number, CXGRID * CYGRID - pos);
data += size;
size = readword(data);
data += 2;
if (data + size != dataend)
warn("level %d: inconsistent metadata", setup->number);
while (data + 2 < dataend) {
size = data[1];
data += 2;
if (data + size > dataend)
size = dataend - data;
switch (data[-2]) {
case 1:
/* time */
break;
case 2:
if (size < 2)
warn("level %d: ignoring field 2 data of size %d",
setup->number, size);
else
state->chipsneeded = readword(data);
break;
case 3:
/* level name */
break;
case 4:
if (size % 10)
warn("level %d: ignoring %d extra bytes at end of field 4",
setup->number, size % 10);
state->trapcount = size / 10;
for (i = 0 ; i < state->trapcount ; ++i) {
state->traps[i].from = readpos(data + i * 10,
data + i * 10 + 2);
state->traps[i].to = readpos(data + i * 10 + 4,
data + i * 10 + 6);
}
break;
case 5:
if (size % 8)
warn("level %d: ignoring %d extra bytes at end of field 5",
setup->number, size % 8);
state->clonercount = size / 8;
for (i = 0 ; i < state->clonercount ; ++i) {
state->cloners[i].from = readpos(data + i * 8,
data + i * 8 + 2);
state->cloners[i].to = readpos(data + i * 8 + 4,
data + i * 8 + 6);
}
break;
case 6:
/* passwd */
break;
case 7:
memcpy(state->hinttext, data, size);
state->hinttext[size] = '\0';
break;
case 8:
/* field 8 passwd */
break;
case 10:
if (size % 2)
warn("level %d: ignoring extra byte at end of field 10",
setup->number);
state->crlistcount = size / 2;
for (i = 0 ; i < state->crlistcount ; ++i)
state->crlist[i] = readpos(data + i * 2, data + i * 2 + 1);
break;
default:
warn("level %d: ignoring unrecognized field %d (%d bytes)",
setup->number, data[-2], size);
break;
}
data += size;
}
return TRUE;
badlevel:
errmsg(NULL, "level %d: invalid data", setup->number);
return FALSE;
}
/* Exported interface.
*/
int expandleveldata(gamestate *state)
{
return expandmsdatlevel(state);
}
/* Return the setup for a small level to display at the completion of
* a series.
*/
void getenddisplaysetup(gamestate *state)
{
static unsigned char endingdata[] = {
0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x6D, 0x00,
0x15, 0x39, 0x39, 0x39, 0x15, 0x39, 0x39, 0x15, 0x39, 0xFF, 0x17, 0x00,
0x39, 0x39, 0x15, 0x15, 0x15, 0x39, 0x39, 0x15, 0x39, 0xFF, 0x17, 0x00,
0x39, 0x39, 0x15, 0x15, 0x15, 0xFF, 0x04, 0x39, 0xFF, 0x17, 0x00,
0x15, 0x39, 0x39, 0x39, 0x15, 0x39, 0x39, 0x15, 0x39, 0xFF, 0x17, 0x00,
0xFF, 0x04, 0x15, 0x6E, 0xFF, 0x04, 0x15, 0xFF, 0x17, 0x00,
0xFF, 0x04, 0x39, 0x15, 0x39, 0x39, 0x39, 0x15, 0xFF, 0x17, 0x00,
0x15, 0x39, 0x39, 0x15, 0x15, 0x39, 0x39, 0x15, 0x39, 0xFF, 0x17, 0x00,
0x15, 0x39, 0x39, 0x15, 0x15, 0x39, 0x39, 0x39, 0x15, 0xFF, 0x17, 0x00,
0xFF, 0x04, 0x39, 0x15, 0x39, 0x39, 0x15, 0x15,
0xFF, 0xFF, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0xF9, 0x00,
0x10, 0x00,
0xFF, 0x84, 0x00, 0x15, 0xFF, 0xFF, 0x00, 0xFF, 0xFF, 0x00,
0xFF, 0xFF, 0x00, 0xFF, 0x7E, 0x00,
0x00, 0x00
};
static gamesetup ending;
ending.number = 1;
ending.time = 0;
ending.besttime = TIME_NIL;
ending.sgflags = 0;
ending.levelsize = sizeof endingdata;
ending.leveldata = endingdata;
ending.solutionsize = 0;
ending.solutiondata = NULL;
strcpy(ending.name, "CONGRATULATIONS!");
ending.passwd[0] = '\0';
state->game = &ending;
expandmsdatlevel(state);
ending.number = 0;
}
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