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/* $Id$ */
#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 <sys/types.h>
#include <sys/stat.h>
#ifdef WIN32
# include <io.h>
#else
# include <unistd.h>
# include <dirent.h>
#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<GRFConfig>(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;
assert(HASBIT(cur->flags, GCF_STATIC));
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:<br>
* <ul>
* <li> GCF_ACTIVATED: No problems occured, all GRF files were found and loaded
* <li> 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
* <li> GCF_NOT_FOUND: For one or more GRF's no match was found at all
* </ul> */
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], *p = buf;
/* 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<GRFConfig>(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 {
UnknownGRF *next;
uint32 grfid;
uint8 md5sum[16];
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 "<Unknown>" 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<UnknownGRF>(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<GRFConfig>(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 }
};
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