/* $Id$ */ #include "stdafx.h" #include "openttd.h" #include "functions.h" #include "macros.h" #include "debug.h" #include "variables.h" #include "string.h" #include "saveload.h" #include "md5.h" #include "network/network_data.h" #include "newgrf.h" #include "newgrf_config.h" #include "helpers.hpp" #include "fileio.h" #include "fios.h" #include #include #ifdef WIN32 # include #else # include # include #endif /* WIN32 */ GRFConfig *_all_grfs; GRFConfig *_grfconfig; GRFConfig *_grfconfig_newgame; GRFConfig *_grfconfig_static; /* Calculate the MD5 Sum for a GRF */ static bool CalcGRFMD5Sum(GRFConfig *config) { FILE *f; char filename[MAX_PATH]; md5_state_t md5state; md5_byte_t buffer[1024]; size_t len; /* open the file */ snprintf(filename, lengthof(filename), "%s%s", _paths.data_dir, config->filename); f = fopen(filename, "rb"); if (f == NULL) return false; /* calculate md5sum */ md5_init(&md5state); while ((len = fread(buffer, 1, sizeof(buffer), f)) != 0) { md5_append(&md5state, buffer, len); } md5_finish(&md5state, config->md5sum); fclose(f); return true; } /* Find the GRFID and calculate the md5sum */ bool FillGRFDetails(GRFConfig *config, bool is_static) { if (!FioCheckFileExists(config->filename)) { SETBIT(config->flags, GCF_NOT_FOUND); return false; } /* Find and load the Action 8 information */ /* 62 is the last file slot before sample.cat. * Should perhaps be some "don't care" value */ LoadNewGRFFile(config, 62, GLS_FILESCAN); /* Skip if the grfid is 0 (not read) or 0xFFFFFFFF (ttdp system grf) */ if (config->grfid == 0 || config->grfid == 0xFFFFFFFF) return false; if (is_static) { /* Perform a 'safety scan' for static GRFs */ LoadNewGRFFile(config, 62, GLS_SAFETYSCAN); /* GCF_UNSAFE is set if GLS_SAFETYSCAN finds unsafe actions */ if (HASBIT(config->flags, GCF_UNSAFE)) return false; } return CalcGRFMD5Sum(config); } void ClearGRFConfig(GRFConfig **config) { /* GCF_COPY as in NOT strdupped/alloced the filename, name and info */ if (!HASBIT((*config)->flags, GCF_COPY)) { free((*config)->filename); free((*config)->name); free((*config)->info); } free(*config); *config = NULL; } /* Clear a GRF Config list */ void ClearGRFConfigList(GRFConfig **config) { GRFConfig *c, *next; for (c = *config; c != NULL; c = next) { next = c->next; ClearGRFConfig(&c); } *config = NULL; } /** Copy a GRF Config list * @param dst pointer to destination list * @param srt pointer to source list values * @return pointer to the last value added to the destination list */ GRFConfig **CopyGRFConfigList(GRFConfig **dst, const GRFConfig *src) { /* Clear destination as it will be overwritten */ ClearGRFConfigList(dst); for (; src != NULL; src = src->next) { GRFConfig *c = CallocT(1); *c = *src; if (src->filename != NULL) c->filename = strdup(src->filename); if (src->name != NULL) c->name = strdup(src->name); if (src->info != NULL) c->info = strdup(src->info); *dst = c; dst = &c->next; } return dst; } /** * Removes duplicates from lists of GRFConfigs. These duplicates * are introduced when the _grfconfig_static GRFs are appended * to the _grfconfig on a newgame or savegame. As the parameters * of the static GRFs could be different that the parameters of * the ones used non-statically. This can result in desyncs in * multiplayers, so the duplicate static GRFs have to be removed. * * This function _assumes_ that all static GRFs are placed after * the non-static GRFs. * * @param list the list to remove the duplicates from */ static void RemoveDuplicatesFromGRFConfigList(GRFConfig *list) { GRFConfig *prev; GRFConfig *cur; if (list == NULL) return; for (prev = list, cur = list->next; cur != NULL; prev = cur, cur = cur->next) { if (cur->grfid != list->grfid) continue; prev->next = cur->next; ClearGRFConfig(&cur); cur = prev; // Just go back one so it continues as normal later on } RemoveDuplicatesFromGRFConfigList(list->next); } /** * Appends the static GRFs to a list of GRFs * @param dst the head of the list to add to */ void AppendStaticGRFConfigs(GRFConfig **dst) { GRFConfig **tail = dst; while (*tail != NULL) tail = &(*tail)->next; CopyGRFConfigList(tail, _grfconfig_static); RemoveDuplicatesFromGRFConfigList(*dst); } /* Reset the current GRF Config to either blank or newgame settings */ void ResetGRFConfig(bool defaults) { GRFConfig **c = &_grfconfig; if (defaults) { c = CopyGRFConfigList(c, _grfconfig_newgame); } else { ClearGRFConfigList(c); } AppendStaticGRFConfigs(&_grfconfig); } /** Check if all GRFs in the GRF config from a savegame can be loaded. * @return will return any of the following 3 values:
*
    *
  • GCF_ACTIVATED: No problems occured, all GRF files were found and loaded *
  • GCF_COMPATIBLE: For one or more GRF's no exact match was found, but a * compatible GRF with the same grfid was found and used instead *
  • GCF_NOT_FOUND: For one or more GRF's no match was found at all *
*/ GCF_Flags IsGoodGRFConfigList(void) { GCF_Flags res = GCF_ACTIVATED; for (GRFConfig *c = _grfconfig; c != NULL; c = c->next) { const GRFConfig *f = FindGRFConfig(c->grfid, c->md5sum); if (f == NULL) { char buf[256]; /* If we have not found the exactly matching GRF try to find one with the * same grfid, as it most likely is compatible */ f = FindGRFConfig(c->grfid); if (f != NULL) { md5sumToString(buf, lastof(buf), c->md5sum); DEBUG(grf, 1, "NewGRF %08X (%s) not found; checksum %s. Compatibility mode on", BSWAP32(c->grfid), c->filename, buf); SETBIT(c->flags, GCF_COMPATIBLE); /* Non-found has precedence over compatibility load */ if (res != GCF_NOT_FOUND) res = GCF_COMPATIBLE; goto compatible_grf; } /* No compatible grf was found, mark it as disabled */ md5sumToString(buf, lastof(buf), c->md5sum); DEBUG(grf, 0, "NewGRF %08X (%s) not found; checksum %s", BSWAP32(c->grfid), c->filename, buf); SETBIT(c->flags, GCF_NOT_FOUND); res = GCF_NOT_FOUND; } else { compatible_grf: DEBUG(grf, 1, "Loading GRF %08X from %s", BSWAP32(f->grfid), f->filename); /* The filename could be the filename as in the savegame. As we need * to load the GRF here, we need the correct filename, so overwrite that * in any case and set the name and info when it is not set already. * When the GCF_COPY flag is set, it is certain that the filename is * already a local one, so there is no need to replace it. */ if (!HASBIT(c->flags, GCF_COPY)) { free(c->filename); c->filename = strdup(f->filename); memcpy(c->md5sum, f->md5sum, sizeof(c->md5sum)); if (c->name == NULL) c->name = strdup(f->name); if (c->info == NULL) c->info = strdup(f->info); } } } return res; } extern bool FiosIsValidFile(const char *path, const struct dirent *ent, struct stat *sb); /* Scan a path for NewGRFs */ static uint ScanPath(const char *path) { uint num = 0; struct stat sb; struct dirent *dirent; DIR *dir; if ((dir = opendir(path)) == NULL) return 0; while ((dirent = readdir(dir)) != NULL) { const char *d_name = FS2OTTD(dirent->d_name); char filename[MAX_PATH]; if (!FiosIsValidFile(path, dirent, &sb)) continue; snprintf(filename, lengthof(filename), "%s" PATHSEP "%s", path, d_name); if (sb.st_mode & S_IFDIR) { /* Directory */ if (strcmp(d_name, ".") == 0 || strcmp(d_name, "..") == 0) continue; num += ScanPath(filename); } else if (sb.st_mode & S_IFREG) { /* File */ char *ext = strrchr(filename, '.'); char *file = filename + strlen(_paths.data_dir) + 1; // Crop base path /* If no extension or extension isn't .grf, skip the file */ if (ext == NULL) continue; if (strcasecmp(ext, ".grf") != 0) continue; GRFConfig *c = CallocT(1); c->filename = strdup(file); if (FillGRFDetails(c, false)) { if (_all_grfs == NULL) { _all_grfs = c; } else { /* Insert file into list at a position determined by its * name, so the list is sorted as we go along */ GRFConfig **pd, *d; for (pd = &_all_grfs; (d = *pd) != NULL; pd = &d->next) { if (strcasecmp(c->name, d->name) <= 0) break; } c->next = d; *pd = c; } num++; } else { /* File couldn't be opened, or is either not a NewGRF or is a * 'system' NewGRF, so forget about it. */ free(c->filename); free(c->name); free(c->info); free(c); } } } closedir(dir); return num; } /* Scan for all NewGRFs */ void ScanNewGRFFiles(void) { uint num; ClearGRFConfigList(&_all_grfs); DEBUG(grf, 1, "Scanning for NewGRFs"); num = ScanPath(_paths.data_dir); DEBUG(grf, 1, "Scan complete, found %d files", num); } /* Find a NewGRF in the scanned list, if md5sum is NULL, we don't care about it*/ const GRFConfig *FindGRFConfig(uint32 grfid, const uint8 *md5sum) { for (const GRFConfig *c = _all_grfs; c != NULL; c = c->next) { if (c->grfid == grfid) { if (md5sum == NULL) return c; if (memcmp(md5sum, c->md5sum, sizeof(c->md5sum)) == 0) return c; } } return NULL; } #ifdef ENABLE_NETWORK /** Structure for UnknownGRFs; this is a lightweight variant of GRFConfig */ typedef struct UnknownGRF UnknownGRF; struct UnknownGRF : public GRFIdentifier { UnknownGRF *next; char name[NETWORK_GRF_NAME_LENGTH]; }; /** * Finds the name of a NewGRF in the list of names for unknown GRFs. An * unknown GRF is a GRF where the .grf is not found during scanning. * * The names are resolved via UDP calls to servers that should know the name, * though the replies may not come. This leaves "" as name, though * that shouldn't matter _very_ much as they need GRF crawler or so to look * up the GRF anyway and that works better with the GRF ID. * * @param grfid the GRF ID part of the 'unique' GRF identifier * @param md5sum the MD5 checksum part of the 'unique' GRF identifier * @param create whether to create a new GRFConfig if the GRFConfig did not * exist in the fake list of GRFConfigs. * @return the GRFConfig with the given GRF ID and MD5 checksum or NULL when * it does not exist and create is false. This value must NEVER be * freed by the caller. */ char *FindUnknownGRFName(uint32 grfid, uint8 *md5sum, bool create) { UnknownGRF *grf; static UnknownGRF *unknown_grfs = NULL; for (grf = unknown_grfs; grf != NULL; grf = grf->next) { if (grf->grfid == grfid) { if (memcmp(md5sum, grf->md5sum, sizeof(grf->md5sum)) == 0) return grf->name; } } if (!create) return NULL; grf = CallocT(1); grf->grfid = grfid; grf->next = unknown_grfs; ttd_strlcpy(grf->name, UNKNOWN_GRF_NAME_PLACEHOLDER, sizeof(grf->name)); memcpy(grf->md5sum, md5sum, sizeof(grf->md5sum)); unknown_grfs = grf; return grf->name; } #endif /* ENABLE_NETWORK */ /* Retrieve a NewGRF from the current config by its grfid */ GRFConfig *GetGRFConfig(uint32 grfid) { GRFConfig *c; for (c = _grfconfig; c != NULL; c = c->next) { if (c->grfid == grfid) return c; } return NULL; } /* Build a space separated list of parameters, and terminate */ char *GRFBuildParamList(char *dst, const GRFConfig *c, const char *last) { uint i; /* Return an empty string if there are no parameters */ if (c->num_params == 0) return strecpy(dst, "", last); for (i = 0; i < c->num_params; i++) { if (i > 0) dst = strecpy(dst, " ", last); dst += snprintf(dst, last - dst, "%d", c->param[i]); } return dst; } static const SaveLoad _grfconfig_desc[] = { SLE_STR(GRFConfig, filename, SLE_STR, 0x40), SLE_VAR(GRFConfig, grfid, SLE_UINT32), SLE_ARR(GRFConfig, md5sum, SLE_UINT8, 16), SLE_ARR(GRFConfig, param, SLE_UINT32, 0x80), SLE_VAR(GRFConfig, num_params, SLE_UINT8), SLE_END() }; static void Save_NGRF(void) { GRFConfig *c; int index = 0; for (c = _grfconfig; c != NULL; c = c->next) { if (HASBIT(c->flags, GCF_STATIC)) continue; SlSetArrayIndex(index++); SlObject(c, _grfconfig_desc); } } static void Load_NGRF(void) { GRFConfig *first = NULL; GRFConfig **last = &first; while (SlIterateArray() != -1) { GRFConfig *c = CallocT(1); SlObject(c, _grfconfig_desc); /* Append our configuration to the list */ *last = c; last = &c->next; } /* Append static NewGRF configuration */ CopyGRFConfigList(last, _grfconfig_static); ClearGRFConfigList(&_grfconfig); _grfconfig = first; AppendStaticGRFConfigs(&_grfconfig); } extern const ChunkHandler _newgrf_chunk_handlers[] = { { 'NGRF', Save_NGRF, Load_NGRF, CH_ARRAY | CH_LAST } };