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openttd/grfspecial.c

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#include "stdafx.h"
#include <stdarg.h>
#include "ttd.h"
#include "gfx.h"
#include "fileio.h"
#include "engine.h"
/* TTDPatch extended GRF format codec
* (c) Petr Baudis 2004 (GPL'd)
* Contains portions of documentation by TTDPatch team.
* Thanks especially to Josef Drexler for the documentation as well as a lot
* of help at #tycoon. Also thanks to Michael Blunck for is GRF files which
* served as subject to the initial testing of this codec. */
extern int _skip_sprites;
static const char *_cur_grffile;
static int _cur_spriteid;
typedef void (*SpecialSpriteHandler)(byte *buf, int len);
static const int _vehshifts[4] = {
0,
ROAD_ENGINES_INDEX,
SHIP_ENGINES_INDEX,
AIRCRAFT_ENGINES_INDEX,
};
enum grfmsg_severity {
GMS_NOTICE,
GMS_WARN,
GMS_ERROR,
GMS_FATAL,
};
static void CDECL grfmsg(enum grfmsg_severity severity, const char *str, ...)
{
static const char * const severitystr[4] = { "Notice", "Warning", "Error", "Fatal" };
char buf[1024];
va_list va;
va_start(va, str);
vsprintf(buf, str, va);
va_end(va);
DEBUG(grf, 2) ("[%s][%s] %s", _cur_grffile, severitystr[severity], buf);
}
static byte INLINE grf_load_byte(byte **buf) {
return *(*buf)++;
}
static uint16 grf_load_word(byte **buf)
{
uint16 val;
byte *p = *buf;
val = p[0];
val |= p[1] << 8;
*buf = p + 2;
return val;
}
static uint16 grf_load_dword(byte **buf)
{
uint32 val;
byte *p = *buf;
val = p[0];
val |= p[1] << 8;
val |= p[2] << 16;
val |= p[3] << 24;
*buf = p + 4;
return val;
}
typedef int (*VCI_Handler)(uint engine, int numinfo, int prop, byte **buf, int len);
#define foreach_engine for (i = 0; i < numinfo; i++)
static void dewagonize(int condition, int engine)
{
EngineInfo *ei = &_engine_info[engine];
RailVehicleInfo *rvi = &_rail_vehicle_info[engine];
if (condition) {
ei->unk2 &= ~0x80;
rvi->flags &= ~2;
} else {
ei->unk2 |= 0x80;
rvi->flags |= 2;
}
}
static int RailVehicleChangeInfo(uint engine, int numinfo, int prop, byte **bufp, int len)
{
EngineInfo *ei = &_engine_info[engine];
RailVehicleInfo *rvi = &_rail_vehicle_info[engine];
byte *buf = *bufp;
int i;
int ret = 0;
switch (prop) {
case 0x05:
{ /* Track type */
foreach_engine {
uint8 tracktype = grf_load_byte(&buf);
ei[i].railtype_climates &= 0xf;
ei[i].railtype_climates |= tracktype << 4;
}
break;
}
case 0x08:
{ /* AI passenger service */
/* TODO */
foreach_engine {
grf_load_byte(&buf);
}
ret = 1;
break;
}
case 0x09:
{ /* Speed */
foreach_engine {
uint16 speed = grf_load_word(&buf);
rvi[i].max_speed = speed;
dewagonize(speed, engine + i);
}
break;
}
case 0x0b:
{ /* Power */
foreach_engine {
uint16 power = grf_load_word(&buf);
rvi[i].power = power;
dewagonize(power, engine + i);
}
break;
}
case 0x0d:
{ /* Running cost factor */
foreach_engine {
uint8 runcostfact = grf_load_byte(&buf);
rvi[i].running_cost_base = runcostfact;
dewagonize(runcostfact, engine + i);
}
break;
}
case 0x0e:
{ /* Running cost base */
foreach_engine {
uint32 base = grf_load_dword(&buf);
switch (base) {
case 0x4c30:
rvi[i].engclass = 0;
break;
case 0x4c36:
rvi[i].engclass = 1;
break;
case 0x4c3c:
rvi[i].engclass = 2;
break;
}
dewagonize(base, engine + i);
}
break;
}
case 0x12:
{ /* Sprite ID */
foreach_engine {
uint8 spriteid = grf_load_byte(&buf);
if (spriteid == 0xfd && rvi[i].image_index != 0xfd)
_engine_original_sprites[engine + i] = rvi[i].image_index;
rvi[i].image_index = spriteid;
}
break;
}
case 0x13:
{ /* Dual-headed */
foreach_engine {
uint8 dual = grf_load_byte(&buf);
if (dual) {
rvi[i].flags |= 1;
} else {
rvi[i].flags &= ~1;
}
}
break;
}
case 0x14:
{ /* Cargo capacity */
foreach_engine {
uint8 capacity = grf_load_byte(&buf);
rvi[i].capacity = capacity;
}
break;
}
case 0x15:
{ /* Cargo type */
foreach_engine {
uint8 ctype = grf_load_byte(&buf);
rvi[i].cargo_type = ctype;
}
break;
}
case 0x16:
{ /* Weight */
foreach_engine {
uint8 weight = grf_load_byte(&buf);
rvi[i].weight = weight;
}
break;
}
case 0x17:
{ /* Cost factor */
foreach_engine {
uint8 cfactor = grf_load_byte(&buf);
rvi[i].base_cost = cfactor;
}
break;
}
case 0x18:
{ /* AI rank */
/* TODO: _railveh_score should be merged to _rail_vehicle_info. */
foreach_engine {
grf_load_byte(&buf);
}
ret = 1;
break;
}
case 0x19:
{ /* Engine traction type */
/* TODO: What do the individual numbers mean?
* XXX: And in what base are they, in fact? --pasky */
foreach_engine {
uint8 traction = grf_load_byte(&buf);
int engclass;
if (traction <= 0x07)
engclass = 0;
else if (traction <= 0x27)
engclass = 1;
else if (traction <= 0x31)
engclass = 2;
else
break;
rvi[i].engclass = engclass;
}
break;
}
/* TODO */
/* Fall-through for unimplemented four bytes long properties. */
case 0x1d: /* Refit cargo */
foreach_engine {
grf_load_word(&buf);
}
/* Fall-through for unimplemented two bytes long properties. */
case 0x1b: /* Powered wagons power bonus */
foreach_engine {
grf_load_byte(&buf);
}
/* Fall-through for unimplemented one byte long properties. */
case 0x1a: /* Sort order */
case 0x1c: /* Refit cost */
case 0x1e: /* Callback */
case 0x1f: /* Tractive effort */
case 0x21: /* Shorter tenders */
case 0x22: /* Visual */
case 0x23: /* Powered wagons weight bonus */
/* TODO */
foreach_engine {
grf_load_byte(&buf);
}
ret = 1;
break;
default:
ret = 1;
break;
}
*bufp = buf;
return ret;
}
static int ShipVehicleChangeInfo(uint engine, int numinfo, int prop, byte **bufp, int len)
{
ShipVehicleInfo *svi = &_ship_vehicle_info[engine];
byte *buf = *bufp;
int i;
int ret = 0;
//printf("e %x prop %x?\n", engine, prop);
switch (prop) {
case 0x08:
{ /* Sprite ID */
foreach_engine {
uint8 spriteid = grf_load_byte(&buf);
if (spriteid == 0xff)
spriteid = 0xfd; // ships have different custom id in the GRF file
// This is currently not used but there's no reason
// in not having it here for the future.
if (spriteid == 0xfd
&& svi[i].image_index != 0xfd)
_engine_original_sprites[SHIP_ENGINES_INDEX
+ engine + i]
= svi[i].image_index;
svi[i].image_index = spriteid;
}
break;
}
case 0x09:
{ /* Refittable */
foreach_engine {
uint8 refittable = grf_load_byte(&buf);
svi[i].refittable = refittable;
}
break;
}
case 0x0a:
{ /* Cost factor */
foreach_engine {
uint8 cost_factor = grf_load_byte(&buf);
svi[i].base_cost = cost_factor; // ?? is it base_cost?
}
break;
}
case 0x0b:
{ /* Speed */
foreach_engine {
uint8 speed = grf_load_byte(&buf);
svi[i].max_speed = speed; // ?? units
}
break;
}
case 0x0c:
{ /* Cargo type */
foreach_engine {
uint8 cargo = grf_load_byte(&buf);
// XXX: Need to consult this with patchman yet.
#if 0
// Documentation claims this is already the
// per-landscape cargo type id, but newships.grf
// assume otherwise.
cargo = local_cargo_id_ctype[cargo];
#endif
svi[i].cargo_type = cargo;
}
break;
}
case 0x0d:
{ /* Cargo capacity */
foreach_engine {
uint16 capacity = grf_load_word(&buf);
svi[i].capacity = capacity;
}
break;
}
case 0x0f:
{ /* Running cost factor */
foreach_engine {
uint8 runcost = grf_load_byte(&buf);
svi[i].running_cost = runcost;
}
break;
}
case 0x10:
{ /* SFX */
foreach_engine {
uint8 sfx = grf_load_byte(&buf);
svi[i].sfx = sfx;
}
break;
}
case 0x11:
{ /* Cargos available for refitting */
foreach_engine {
uint32 refit_mask = grf_load_dword(&buf);
_engine_refit_masks[SHIP_ENGINES_INDEX + engine + i] = refit_mask;
}
break;
}
case 0x12:
{ /* Callback */
/* TODO */
ret = 1;
break;
}
default:
ret = 1;
break;
}
*bufp = buf;
return ret;
}
#undef shift_buf
static void VehicleChangeInfo(byte *buf, int len)
{
byte *bufend = buf + len;
int i;
/* <00> <feature> <num-props> <num-info> <id> (<property <new-info>)...
*
* B feature 0, 1, 2 or 3 for trains, road vehicles, ships or planes
* 4 for defining new train station sets
* B num-props how many properties to change per vehicle/station
* B num-info how many vehicles/stations to change
* B id ID of first vehicle/station to change, if num-info is
* greater than one, this one and the following
* vehicles/stations will be changed
* B property what property to change, depends on the feature
* V new-info new bytes of info (variable size; depends on properties) */
/* TODO: Only trains and ships are supported for now. */
static const VCI_Handler handler[5] = {
RailVehicleChangeInfo,
NULL,
ShipVehicleChangeInfo,
NULL,
NULL,
};
if (len > 5) {
uint8 feature = buf[1];
uint8 numprops = buf[2];
uint8 numinfo = buf[3];
byte engine = buf[4];
EngineInfo *ei;
if (feature != 0 && feature != 2) {
grfmsg(GMS_WARN, "VehicleChangeInfo: Unsupported vehicle type %x, skipping.", feature);
return;
}
ei = &_engine_info[engine + _vehshifts[feature]];
buf += 5;
while (numprops-- && buf < bufend) {
uint8 prop = grf_load_byte(&buf);
switch (prop) {
case 0x00: {
/* Introduction date */
foreach_engine {
uint16 date = grf_load_word(&buf);
ei[i].base_intro = date;
}
break;
}
case 0x02: {
/* Decay speed */
foreach_engine {
uint8 decay = grf_load_byte(&buf);
ei[i].unk2 &= 0x80;
ei[i].unk2 |= decay & 0x7f;
}
break;
}
case 0x03: {
/* Vehicle life */
foreach_engine {
uint8 life = grf_load_byte(&buf);
ei[i].lifelength = life;
}
break;
}
case 0x04: {
/* Model life */
foreach_engine {
uint8 life = grf_load_byte(&buf);
ei[i].base_life = life;
}
break;
}
case 0x06: {
/* Climates available */
foreach_engine {
uint8 climates = grf_load_byte(&buf);
ei[i].railtype_climates &= 0xf0;
ei[i].railtype_climates |= climates;
}
break;
}
case 0x07: {
/* Loading speed */
/* Hyronymus explained me what does
* this mean and insists on having a
* credit ;-). --pasky */
/* TODO: This needs to be supported by
* LoadUnloadVehicle() first. */
foreach_engine {
grf_load_byte(&buf);
}
goto ignoring;
}
default:
{
if (handler[feature](engine, numinfo, prop, &buf, bufend - buf)) {
ignoring:
grfmsg(GMS_WARN, "VehicleChangeInfo: Ignoring property %x.", prop);
}
break;
}
}
}
}
#undef shift_buf
}
/* A sprite superset contains all sprites of a given vehicle (or multiple
* vehicles) when carrying given cargo. It consists of several sprite sets.
* Superset ids are refered as "cargo id"s by TTDPatch documentation,
* contributing to the global confusion.
*
* A sprite set contains all sprites of a given vehicle carrying given cargo at
* a given *stage* - that is usually its load stage. Ie. you can have a
* spriteset for an empty wagon, wagon full of coal, half-filled wagon etc.
* Each spriteset contains eight sprites (one per direction) or four sprites if
* the vehicle is symmetric. */
static int _spriteset_start;
static int _spriteset_numsets;
static int _spriteset_numents;
static int _spriteset_feature;
static int _spritesset_count;
static struct SpriteSuperSet *_spritesset;
static void SpriteNewSet(byte *buf, int len)
{
/* <01> <feature> <num-sets> <num-ent>
*
* B feature feature to define sprites for
* 0, 1, 2, 3: veh-type, 4: train stations
* B num-sets number of sprite sets
* B num-ent how many entries per sprite set
* For vehicles, this is the number of different
* vehicle directions in each sprite set
* Set num-dirs=8, unless your sprites are symmetric.
* In that case, use num-dirs=4.
* For stations, must be 12 (hex) for the eighteen
* different sprites that make up a station */
/* TODO: No stations support. */
if (len == 4) {
uint8 feature = buf[1];
if (feature == 4) {
_spriteset_start = 0;
grfmsg(GMS_WARN, "SpriteNewSet: Stations unsupported, skipping.");
return;
}
_spriteset_start = _cur_spriteid + 1;
_spriteset_numsets = buf[2];
_spriteset_numents = buf[3];
_spriteset_feature = feature;
}
}
static void SpriteNewSuperset(byte *buf, int len)
{
byte *bufend = buf + len;
/* <02> <feature> <set-id> <type/num-entries> <feature-specific-data...>
*
* B feature see action 1
* B set-id ID of this particular definition
* B type/num-entries
* if 80 or greater, this is a randomized or variational
* list definition, see below
* otherwise it specifies a number of entries, the exact
* meaning depends on the feature
* V feature-specific-data (huge mess, don't even look it up --pasky) */
/* TODO: Only trains supported now. No 0x80-types (ugh). */
/* TODO: Also, empty sprites aren't handled for now. Need to investigate
* the "opacity" rules for these, that is which sprite to fall back to
* when. --pasky */
if (bufend - buf > 4) {
uint8 feature = buf[1];
uint8 setid = buf[2];
uint8 numloaded = buf[3];
uint8 numloading = buf[4];
struct SpriteSuperSet *superset;
int i;
if (feature == 4) {
grfmsg(GMS_WARN, "SpriteNewSuperset: Stations unsupported, skipping.");
return;
}
if (numloaded == 0x81) {
// XXX: This is _VERY_ ad hoc just to handle Dm3. And that is
// a semi-futile ask because the great Patchman himself says
// this is just buggy. It dereferences last (first) byte of
// a schedule list pointer of the vehicle and if it's 0xff
// it uses superset 01, otherwise it uses superset 00. Now
// if _you_ understand _that_... We just assume it is never
// 0xff and therefore go for superset 00. --pasky
uint8 var = buf[4];
//uint8 shiftnum = buf[5];
//uint8 andmask = buf[6];
uint8 nvar = buf[7];
//uint32 val;
uint16 def;
grfmsg(GMS_WARN, "SpriteNewSuperset(0x81): Unsupported variable %x. Using default cid.", var);
//val = (0xff << shiftnum) & andmask;
//Go for the default.
if (setid >= _spritesset_count) {
_spritesset_count = setid + 1;
_spritesset = realloc(_spritesset, _spritesset_count * sizeof(struct SpriteSuperSet));
}
buf += 8 + nvar * 4;
def = grf_load_word(&buf);
_spritesset[setid] = _spritesset[def];
return;
} else if (numloaded & 0x80) {
grfmsg(GMS_WARN, "SpriteNewSuperset(0x%x): Unsupported special superset.", numloaded);
return;
}
if (!_spriteset_start) {
grfmsg(GMS_WARN, "SpriteNewSuperset: No sprite set to work on! Skipping.");
return;
}
if (_spriteset_feature != feature) {
grfmsg(GMS_WARN, "SpriteNewSuperset: Superset feature %x doesn't match set feature %x! Skipping.", feature, _spriteset_feature);
return;
}
if (setid >= _spritesset_count) {
_spritesset_count = setid + 1;
_spritesset = realloc(_spritesset, _spritesset_count * sizeof(struct SpriteSuperSet));
}
superset = &_spritesset[setid];
memset(superset, 0, sizeof(struct SpriteSuperSet));
superset->sprites_per_set = _spriteset_numents;
buf += 5;
for (i = 0; buf < bufend && i < numloaded; i++) {
uint16 spriteset_id = grf_load_word(&buf);
if (_spritesset[setid].loaded_count > 16) {
grfmsg(GMS_WARN, "SpriteNewSuperset: More than 16 sprites in superset %x, skipping.", setid);
return;
}
superset->loaded[superset->loaded_count++]
= _spriteset_start + spriteset_id * _spriteset_numents;
}
for (i = 0; buf < bufend && i < numloading; i++) {
uint16 spriteset_id = grf_load_word(&buf);
if (_spritesset[setid].loading_count > 16) {
grfmsg(GMS_WARN, "SpriteNewSuperset: More than 16 sprites in superset %x, skipping.", setid);
return;
}
superset->loading[superset->loading_count++] = _spriteset_start + spriteset_id * _spriteset_numents;
}
}
}
static void VehicleMapSpriteSuperset(byte *buf, int len)
{
byte *bufend = buf + len;
/* <03> <feature> <n-id> <ids>... <num-cid> [<cargo-type> <cid>]... <def-cid>
*
* B feature see action 0
* B n-id bits 0-6: how many IDs this definition applies to
* bit 7: if set, this is a wagon override definition (see below)
* B ids the IDs for which this definition applies
* B num-cid number of cargo IDs in this definition
* can be zero, in that case the def-cid is used always
* B cargo-type type of this cargo type (e.g. mail=2, wood=7, see below)
* W cid cargo ID for this type of cargo
* W def-cid default cargo ID */
/* TODO: Only trains supported now. */
/* TODO: Multiple cargo support could be useful even for trains/cars -
* cargo id 0xff is used for showing images in the build train list. */
static byte *last_engines;
static int last_engines_count;
if (bufend - buf > 6) {
uint8 feature = buf[1];
uint8 idcount = buf[2] & 0x7f;
int wagover = buf[2] & 0x80;
uint8 cidcount = buf[3 + idcount];
int c, i;
if (feature == 4) {
grfmsg(GMS_WARN, "VehicleMapSpriteSuperset: Stations unsupported, skipping.");
return;
}
// FIXME: Tropicset contains things like:
// 03 00 01 19 01 00 00 00 00 - this is missing one 00 at the end,
// what should we exactly do with that? --pasky
if (!_spriteset_start || !_spritesset) {
grfmsg(GMS_WARN, "VehicleMapSpriteSuperset: No sprite set to work on! Skipping.");
return;
}
if (!wagover && last_engines_count != idcount) {
last_engines = realloc(last_engines, idcount);
last_engines_count = idcount;
}
for (i = 0; i < idcount; i++) {
uint8 engine = buf[3 + i] + _vehshifts[feature];
byte *bp = &buf[4 + idcount];
for (c = 0; c < cidcount; c++) {
uint8 ctype = grf_load_byte(&bp);
uint16 supersetid = grf_load_word(&bp);
if (supersetid >= _spritesset_count) {
grfmsg(GMS_WARN, "VehicleMapSpriteSuperset: Spriteset %x out of range %x, skipping.", supersetid, _spritesset_count);
return;
}
if (ctype == 0xff)
ctype = CID_PURCHASE;
if (wagover) {
// TODO: No multiple cargo types per vehicle yet. --pasky
SetWagonOverrideSprites(engine, &_spritesset[supersetid], last_engines, last_engines_count);
} else {
SetCustomEngineSprites(engine, ctype, &_spritesset[supersetid]);
last_engines[i] = engine;
}
}
}
{
byte *bp = buf + 4 + idcount + cidcount * 3;
uint16 supersetid = grf_load_word(&bp);
for (i = 0; i < idcount; i++) {
uint8 engine = buf[3 + i] + _vehshifts[feature];
// Don't tell me you don't love duplicated code!
if (supersetid >= _spritesset_count) {
grfmsg(GMS_WARN, "VehicleMapSpriteSuperset: Spriteset %x out of range %x, skipping.", supersetid, _spritesset_count);
return;
}
if (wagover) {
// TODO: No multiple cargo types per vehicle yet. --pasky
SetWagonOverrideSprites(engine, &_spritesset[supersetid], last_engines, last_engines_count);
} else {
SetCustomEngineSprites(engine, CID_DEFAULT, &_spritesset[supersetid]);
last_engines[i] = engine;
}
}
}
}
}
static void VehicleNewName(byte *buf, int len)
{
/* <04> <veh-type> <language-id> <num-veh> <offset> <data...>
*
* B veh-type see action 0
* B language-id language ID with bit 7 cleared (see below)
* B num-veh number of vehicles which are getting a new name
* B offset number of the first vehicle that gets a new name
* S data new texts, each of them zero-terminated, after
* which the next name begins. */
/* TODO: No support for changing non-vehicle text. Perhaps we shouldn't
* implement it at all, but it could be useful for some "modpacks"
* (completely new scenarios changing all graphics and logically also
* factory names etc). We should then also support all languages (by
* name), not only the original four ones. --pasky */
if (len > 5) {
uint8 feature = buf[1];
uint8 lang = buf[2];
uint8 id = buf[4] + _vehshifts[feature];
uint8 endid = id + buf[3];
if (lang & 0x80) {
grfmsg(GMS_WARN, "VehicleNewName: No support for changing in-game texts. Skipping.");
return;
}
if (!(lang & 3)) {
/* XXX: If non-English name, silently skip it. */
return;
}
buf += 5, len -= 5;
for (; id < endid && len > 0; id++) {
int ofs = strlen(buf) + 1;
if (ofs < 128)
SetCustomEngineName(id, buf);
buf += ofs, len -= ofs;
}
}
}
static void GraphicsNew(byte *buf, int len)
{
/* <05> <graphics-type> <num-sprites> <other data...>
*
* B graphics-type What set of graphics the sprites define.
* B num-sprites How many sprites are in this set?
* V other data Graphics type specific data. Currently unused. */
/* TODO */
}
static void CfgApply(byte *buf, int len)
{
/* <06> <param-num> <param-size> <offset> ... <FF>
*
* B param-num Number of parameter to substitute (First = "zero")
* Ignored if that parameter was not specified in newgrf.cfg
* B param-size How many bytes to replace. If larger than 4, the
* bytes of the following parameter are used. In that
* case, nothing is applied unless *all* parameters
* were specified.
* B offset Offset into data from beginning of next sprite
* to place where parameter is to be stored. */
/* TODO */
}
static void SkipIf(byte *buf, int len)
{
/* <07/09> <param-num> <param-size> <condition-type> <value> <num-sprites>
*
* B param-num
* B param-size
* B condition-type
* V value
* B num-sprites */
/* TODO: We only support few tests. */
/* TODO: More params. More condition types. */
if (len > 5) {
uint8 param = buf[1];
uint8 paramsize = buf[2];
uint8 condtype = buf[3];
uint8 numsprites = buf[4 + paramsize];
int val, result;
if (param == 0x83) {
val = _opt.landscape;
} else {
grfmsg(GMS_WARN, "Unsupported param %x. Ignoring test.", param);
return;
}
switch (condtype) {
case 2: result = (buf[4] == val);
break;
case 3: result = (buf[4] != val);
break;
default:
grfmsg(GMS_WARN, "Unsupported test %d. Ignoring.", condtype);
return;
}
if (!result)
return;
_skip_sprites = numsprites;
if (_skip_sprites == 0) {
/* Zero means there are no sprites to skip, so
* we use -1 to indicate that all further
* sprites should be skipped. */
_skip_sprites = -1;
}
}
}
static void GRFInfo(byte *buf, int len)
{
/* <08> <version> <grf-id> <name> <info>
*
* B version newgrf version, currently 06
* 4*B grf-id globally unique ID of this .grf file
* S name name of this .grf set
* S info string describing the set, and e.g. author and copyright */
/* TODO: Check version. (We should have own versioning done somehow.) */
if (len > 8) {
uint8 version = buf[1];
// this is de facto big endian - grf_load_dword() unsuitable
uint32 grfid = buf[2] << 24 | buf[3] << 16 | buf[4] << 8 | buf[5];
DEBUG(grf, 1) ("[%s] Loaded GRFv%d set %08lx - %s:\n%s\n", _cur_grffile, version, grfid, buf+6, buf+6+strlen(buf+6)+1);
}
}
static void SpriteReplace(byte *buf, int len)
{
/* <0A> <num-sets> <set1> [<set2> ...]
* <set>: <num-sprites> <first-sprite>
*
* B num-sets How many sets of sprites to replace.
* Each set:
* B num-sprites How many sprites are in this set
* W first-sprite First sprite number to replace */
/* TODO */
}
static void GRFError(byte *buf, int len)
{
/* <0B> <severity> <language-id> <message-id> [<message...> 00] [<data...>] 00 [<parnum>]
*
* B severity 00: notice, contine loading grf file
* 01: warning, continue loading grf file
* 02: error, but continue loading grf file, and attempt
* loading grf again when loading or starting next game
* 03: error, abort loading and prevent loading again in
* the future (only when restarting the patch)
* B language-id see action 4, use 1F for built-in error messages
* B message-id message to show, see below
* S message for custom messages (message-id FF), text of the message
* not present for built-in messages.
* V data additional data for built-in (or custom) messages
* B parnum see action 6, only used with built-in message 03 */
/* TODO: For now we just show the message, sometimes incomplete and never translated. */
static const char * const msgstr[4] = {
"Requires at least pseudo-TTDPatch version %s.",
"This file is for %s version of TTD.",
"Designed to be used with %s.",
"Invalid parameter %s.",
};
if (len > 5) {
uint8 severity = buf[1];
uint8 msgid = buf[3];
if (msgid == 0xff) {
grfmsg(severity, "%s", buf+4);
} else {
grfmsg(severity, msgstr[msgid], buf+4);
}
}
}
static void GRFComment(byte *buf, int len)
{
/* <0C> [<ignored...>]
*
* V ignored Anything following the 0C is ignored */
}
static void ParamSet(byte *buf, int len)
{
/* <0D> <target> <operation> <source1> <source2> [<data>]
*
* B target parameter number where result is stored
* B operation operation to perform, see below
* B source1 first source operand
* B source2 second source operand
* D data data to use in the calculation, not necessary
* if both source1 and source2 refer to actual parameters
*
* Operations
* 00 Set parameter equal to source1
* 01 Addition, source1 + source2
* 02 Subtraction, source1 - source2
* 03 Unsigned multiplication, source1 * source2 (both unsigned)
* 04 Signed multiplication, source1 * source2 (both signed)
* 05 Unsigned bit shift, source1 by source2 (source2 taken to be a
* signed quantity; left shift if positive and right shift if
* negative, source1 is unsigned)
* 06 Signed bit shift, source1 by source2
* (source2 like in 05, and source1 as well)
*/
/* TODO */
}
static void GRFInhibit(byte *buf, int len)
{
/* <0E> <num> <grfids...>
*
* B num Number of GRFIDs that follow
* D grfids GRFIDs of the files to deactivate */
/* TODO */
}
/* Here we perform initial decoding of some special sprites (as are they
* described at http://www.ttdpatch.net/src/newgrf.txt, but this is only a very
* partial implementation yet; also, we ignore the stages stuff). */
/* XXX: We consider GRF files trusted. It would be trivial to exploit OTTD by
* a crafted invalid GRF file. We should tell that to the user somehow, or
* better make this more robust in the future. */
void DecodeSpecialSprite(const char *filename, int num, int spriteid)
{
#define NUM_ACTIONS 0xf
static const SpecialSpriteHandler handlers[NUM_ACTIONS] = {
/* 0x0 */ VehicleChangeInfo,
/* 0x1 */ SpriteNewSet,
/* 0x2 */ SpriteNewSuperset,
/* 0x3 */ VehicleMapSpriteSuperset,
/* 0x4 */ VehicleNewName,
/* 0x5 */ GraphicsNew,
/* 0x6 */ CfgApply,
/* 0x7 */ SkipIf,
/* 0x8 */ GRFInfo,
/* 0x9 */ SkipIf,
/* 0xa */ SpriteReplace,
/* 0xb */ GRFError,
/* 0xc */ GRFComment,
/* 0xd */ ParamSet,
/* 0xe */ GRFInhibit,
};
byte action;
byte *buf = malloc(num);
int i;
_cur_grffile = filename;
_cur_spriteid = spriteid;
for (i = 0; i != num; i++)
buf[i] = FioReadByte();
action = buf[0];
if (action < NUM_ACTIONS) {
handlers[action](buf, num);
} else {
grfmsg(GMS_WARN, "Unknown special sprite action %x, skipping.", action);
}
free(buf);
#undef NUM_ACTIONS
}
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