libpcsxcore/ppf.c

   1 /*  PPF Patch Support for PCSX-Reloaded
   2  *  Copyright (c) 2009, Wei Mingzhi <whistler_wmz@users.sf.net>.
   3  *
   4  *  Based on P.E.Op.S CDR Plugin by Pete Bernert.
   5  *  Copyright (c) 2002, Pete Bernert.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307 USA
  20  */
  21
  22 #include "psxcommon.h"
  23 #include "ppf.h"
  24 #include "misc.h"
  25 #include "cdrom.h"
  26
  27 typedef struct tagPPF_DATA {
  28         s32                                     addr;
  29         s32                                     pos;
  30         s32                                     anz;
  31         struct tagPPF_DATA      *pNext;
  32 } PPF_DATA;
  33
  34 typedef struct tagPPF_CACHE {
  35         s32                                     addr;
  36         struct tagPPF_DATA      *pNext;
  37 } PPF_CACHE;
  38
  39 static PPF_CACHE                *ppfCache = NULL;
  40 static PPF_DATA                 *ppfHead = NULL, *ppfLast = NULL;
  41 static int                              iPPFNum = 0;
  42
  43 // using a linked data list, and address array
  44 static void FillPPFCache() {
  45         PPF_DATA                *p;
  46         PPF_CACHE               *pc;
  47         s32                             lastaddr;
  48
  49         p = ppfHead;
  50         lastaddr = -1;
  51         iPPFNum = 0;
  52
  53         while (p != NULL) {
  54                 if (p->addr != lastaddr) iPPFNum++;
  55                 lastaddr = p->addr;
  56                 p = p->pNext;
  57         }
  58
  59         if (iPPFNum <= 0) return;
  60
  61         pc = ppfCache = (PPF_CACHE *)malloc(iPPFNum * sizeof(PPF_CACHE));
  62         if (pc == NULL) return;
  63
  64         iPPFNum--;
  65         p = ppfHead;
  66         lastaddr = -1;
  67
  68         while (p != NULL) {
  69                 if (p->addr != lastaddr) {
  70                         pc->addr = p->addr;
  71                         pc->pNext = p;
  72                         pc++;
  73                 }
  74                 lastaddr = p->addr;
  75                 p = p->pNext;
  76         }
  77 }
  78
  79 void FreePPFCache() {
  80         PPF_DATA *p = ppfHead;
  81         void *pn;
  82
  83         while (p != NULL) {
  84                 pn = p->pNext;
  85                 free(p);
  86                 p = (PPF_DATA *)pn;
  87         }
  88         ppfHead = NULL;
  89         ppfLast = NULL;
  90
  91         if (ppfCache != NULL) free(ppfCache);
  92         ppfCache = NULL;
  93 }
  94
  95 void CheckPPFCache(unsigned char *pB, unsigned char m, unsigned char s, unsigned char f) {
  96         PPF_CACHE *pcstart, *pcend, *pcpos;
  97         int addr = MSF2SECT(btoi(m), btoi(s), btoi(f)), pos, anz, start;
  98
  99         if (ppfCache == NULL) return;
 100
 101         pcstart = ppfCache;
 102         if (addr < pcstart->addr) return;
 103         pcend = ppfCache + iPPFNum;
 104         if (addr > pcend->addr) return;
 105
 106         while (1) {
 107                 if (addr == pcend->addr) { pcpos = pcend; break; }
 108
 109                 pcpos = pcstart + (pcend - pcstart) / 2;
 110                 if (pcpos == pcstart) break;
 111                 if (addr < pcpos->addr) {
 112                         pcend = pcpos;
 113                         continue;
 114                 }
 115                 if (addr > pcpos->addr) {
 116                         pcstart = pcpos;
 117                         continue;
 118                 }
 119                 break;
 120         }
 121
 122         if (addr == pcpos->addr) {
 123                 PPF_DATA *p = pcpos->pNext;
 124                 while (p != NULL && p->addr == addr) {
 125                         pos = p->pos - (CD_FRAMESIZE_RAW - DATA_SIZE);
 126                         anz = p->anz;
 127                         if (pos < 0) { start = -pos; pos = 0; anz -= start; }
 128                         else start = 0;
 129                         memcpy(pB + pos, (unsigned char *)(p + 1) + start, anz);
 130                         p = p->pNext;
 131                 }
 132         }
 133 }
 134
 135 static void AddToPPF(s32 ladr, s32 pos, s32 anz, unsigned char *ppfmem) {
 136         if (ppfHead == NULL) {
 137                 ppfHead = (PPF_DATA *)malloc(sizeof(PPF_DATA) + anz);
 138                 if (ppfHead == NULL) return;
 139                 ppfHead->addr = ladr;
 140                 ppfHead->pNext = NULL;
 141                 ppfHead->pos = pos;
 142                 ppfHead->anz = anz;
 143                 memcpy(ppfHead + 1, ppfmem, anz);
 144                 iPPFNum = 1;
 145                 ppfLast = ppfHead;
 146         } else {
 147                 PPF_DATA *p = ppfHead;
 148                 PPF_DATA *plast = NULL;
 149                 PPF_DATA *padd;
 150
 151                 if (ladr > ppfLast->addr || (ladr == ppfLast->addr && pos > ppfLast->pos)) {
 152                         p = NULL;
 153                         plast = ppfLast;
 154                 } else {
 155                         while (p != NULL) {
 156                                 if (ladr < p->addr) break;
 157                                 if (ladr == p->addr) {
 158                                         while (p && ladr == p->addr && pos > p->pos) {
 159                                                 plast = p;
 160                                                 p = p->pNext;
 161                                         }
 162                                         break;
 163                                 }
 164                                 plast = p;
 165                                 p = p->pNext;
 166                         }
 167                 }
 168
 169                 padd = (PPF_DATA *)malloc(sizeof(PPF_DATA) + anz);
 170                 if (padd == NULL) return;
 171                 padd->addr = ladr;
 172                 padd->pNext = p;
 173                 padd->pos = pos;
 174                 padd->anz = anz;
 175                 memcpy(padd + 1, ppfmem, anz);
 176                 iPPFNum++;
 177                 if (plast == NULL) ppfHead = padd;
 178                 else plast->pNext = padd;
 179
 180                 if (padd->pNext == NULL) ppfLast = padd;
 181         }
 182 }
 183
 184 void BuildPPFCache() {
 185         FILE                    *ppffile;
 186         char                    buffer[12];
 187         char                    method, undo = 0, blockcheck = 0;
 188         int                             dizlen, dizyn;
 189         unsigned char   ppfmem[512];
 190         char                    szPPF[MAXPATHLEN * 2];
 191         int                             count, seekpos, pos;
 192         u32                             anz; // use 32-bit to avoid stupid overflows
 193         s32                             ladr, off, anx;
 194
 195         FreePPFCache();
 196
 197         if (CdromId[0] == '\0') return;
 198
 199         // Generate filename in the format of SLUS_123.45
 200         buffer[0] = toupper(CdromId[0]);
 201         buffer[1] = toupper(CdromId[1]);
 202         buffer[2] = toupper(CdromId[2]);
 203         buffer[3] = toupper(CdromId[3]);
 204         buffer[4] = '_';
 205         buffer[5] = CdromId[4];
 206         buffer[6] = CdromId[5];
 207         buffer[7] = CdromId[6];
 208         buffer[8] = '.';
 209         buffer[9] = CdromId[7];
 210         buffer[10] = CdromId[8];
 211         buffer[11] = '\0';
 212
 213         sprintf(szPPF, "%s%s", Config.PatchesDir, buffer);
 214
 215         ppffile = fopen(szPPF, "rb");
 216         if (ppffile == NULL) return;
 217
 218         memset(buffer, 0, 5);
 219         if (fread(buffer, 1, 3, ppffile) != 3)
 220                 goto fail_io;
 221
 222         if (strcmp(buffer, "PPF") != 0) {
 223                 SysPrintf(_("Invalid PPF patch: %s.\n"), szPPF);
 224                 fclose(ppffile);
 225                 return;
 226         }
 227
 228         fseek(ppffile, 5, SEEK_SET);
 229         method = fgetc(ppffile);
 230
 231         switch (method) {
 232                 case 0: // ppf1
 233                         fseek(ppffile, 0, SEEK_END);
 234                         count = ftell(ppffile);
 235                         count -= 56;
 236                         seekpos = 56;
 237                         break;
 238
 239                 case 1: // ppf2
 240                         fseek(ppffile, -8, SEEK_END);
 241
 242                         memset(buffer, 0, 5);
 243                         if (fread(buffer, 1, 4, ppffile) != 4)
 244                                 goto fail_io;
 245
 246                         if (strcmp(".DIZ", buffer) != 0) {
 247                                 dizyn = 0;
 248                         } else {
 249                                 if (fread(&dizlen, 1, 4, ppffile) != 4)
 250                                         goto fail_io;
 251                                 dizlen = SWAP32(dizlen);
 252                                 dizyn = 1;
 253                         }
 254
 255                         fseek(ppffile, 0, SEEK_END);
 256                         count = ftell(ppffile);
 257
 258                         if (dizyn == 0) {
 259                                 count -= 1084;
 260                                 seekpos = 1084;
 261                         } else {
 262                                 count -= 1084;
 263                                 count -= 38;
 264                                 count -= dizlen;
 265                                 seekpos = 1084;
 266                         }
 267                         break;
 268
 269                 case 2: // ppf3
 270                         fseek(ppffile, 57, SEEK_SET);
 271                         blockcheck = fgetc(ppffile);
 272                         undo = fgetc(ppffile);
 273
 274                         fseek(ppffile, -6, SEEK_END);
 275                         memset(buffer, 0, 5);
 276                         if (fread(buffer, 1, 4, ppffile) != 4)
 277                                 goto fail_io;
 278                         dizlen = 0;
 279
 280                         if (strcmp(".DIZ", buffer) == 0) {
 281                                 fseek(ppffile, -2, SEEK_END);
 282                                 // TODO: Endian/size unsafe?
 283                                 if (fread(&dizlen, 1, 2, ppffile) != 2)
 284                                         goto fail_io;
 285                                 dizlen = SWAP32(dizlen);
 286                                 dizlen += 36;
 287                         }
 288
 289                         fseek(ppffile, 0, SEEK_END);
 290                         count = ftell(ppffile);
 291                         count -= dizlen;
 292
 293                         if (blockcheck) {
 294                                 seekpos = 1084;
 295                                 count -= 1084;
 296                         } else {
 297                                 seekpos = 60;
 298                                 count -= 60;
 299                         }
 300                         break;
 301
 302                 default:
 303                         fclose(ppffile);
 304                         SysPrintf(_("Unsupported PPF version (%d).\n"), method + 1);
 305                         return;
 306         }
 307
 308         // now do the data reading
 309         do {
 310                 fseek(ppffile, seekpos, SEEK_SET);
 311                 if (fread(&pos, 1, sizeof(pos), ppffile) != sizeof(pos))
 312                         goto fail_io;
 313                 pos = SWAP32(pos);
 314
 315                 if (method == 2) {
 316                         // skip 4 bytes on ppf3 (no int64 support here)
 317                         if (fread(buffer, 1, 4, ppffile) != 4)
 318                                 goto fail_io;
 319                 }
 320
 321                 anz = fgetc(ppffile);
 322                 if (fread(ppfmem, 1, anz, ppffile) != anz)
 323                         goto fail_io;
 324
 325                 ladr = pos / CD_FRAMESIZE_RAW;
 326                 off = pos % CD_FRAMESIZE_RAW;
 327
 328                 if (off + anz > CD_FRAMESIZE_RAW) {
 329                         anx = off + anz - CD_FRAMESIZE_RAW;
 330                         anz -= (unsigned char)anx;
 331                         AddToPPF(ladr + 1, 0, anx, &ppfmem[anz]);
 332                 }
 333
 334                 AddToPPF(ladr, off, anz, ppfmem); // add to link list
 335
 336                 if (method == 2) {
 337                         if (undo) anz += anz;
 338                         anz += 4;
 339                 }
 340
 341                 seekpos = seekpos + 5 + anz;
 342                 count = count - 5 - anz;
 343         } while (count != 0); // loop til end
 344
 345         fclose(ppffile);
 346
 347         FillPPFCache(); // build address array
 348
 349         SysPrintf(_("Loaded PPF %d.0 patch: %s.\n"), method + 1, szPPF);
 350
 351 fail_io:
 352 #ifndef NDEBUG
 353         SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
 354 #endif
 355         fclose(ppffile);
 356 }
 357
 358 // redump.org SBI files, slightly different handling from PCSX-Reloaded
 359 unsigned char *sbi_sectors;
 360 int sbi_len;
 361
 362 int LoadSBI(const char *fname, int sector_count) {
 363         int good_sectors = 0;
 364         int clean_eof = 0;
 365         char buffer[16];
 366         FILE *sbihandle;
 367         u8 sbitime[3], t;
 368         int s;
 369
 370         sbihandle = fopen(fname, "rb");
 371         if (sbihandle == NULL)
 372                 return -1;
 373
 374         sbi_len = (sector_count + 7) / 8;
 375         sbi_sectors = calloc(1, sbi_len);
 376         if (sbi_sectors == NULL)
 377                 goto end;
 378
 379         // 4-byte SBI header
 380         if (fread(buffer, 1, 4, sbihandle) != 4)
 381                 goto end;
 382
 383         while (1) {
 384                 s = fread(sbitime, 1, 3, sbihandle);
 385                 if (s != 3)
 386                 {
 387                         if (s == 0)
 388                                 clean_eof = 1;
 389                         break;
 390                 }
 391                 s = MSF2SECT(btoi(sbitime[0]), btoi(sbitime[1]), btoi(sbitime[2]));
 392                 if (s < sector_count) {
 393                         sbi_sectors[s >> 3] |= 1 << (s&7);
 394                         good_sectors++;
 395                 }
 396                 else
 397                         SysPrintf(_("SBI sector %d >= %d?\n"), s, sector_count);
 398
 399                 // skip to the next record
 400                 if (fread(&t, 1, sizeof(t), sbihandle) != sizeof(t))
 401                         break;
 402                 s = -1;
 403                 switch (t) {
 404                 default:
 405                 case 1:
 406                         s = 10;
 407                         break;
 408                 case 2:
 409                 case 3:
 410                         s = 3;
 411                         break;
 412                 }
 413                 if (s < 0)
 414                         break;
 415                 if (fseek(sbihandle, s, SEEK_CUR))
 416                         break;
 417         }
 418
 419 end:
 420         if (!clean_eof)
 421                 SysPrintf(_("SBI: parse failure at 0x%lx\n"), ftell(sbihandle));
 422         if (!good_sectors) {
 423                 free(sbi_sectors);
 424                 sbi_sectors = NULL;
 425                 sbi_len = 0;
 426         }
 427         fclose(sbihandle);
 428         return sbi_sectors ? 0 : -1;
 429 }
 430
 431 void UnloadSBI(void) {
 432         if (sbi_sectors) {
 433                 free(sbi_sectors);
 434                 sbi_sectors = NULL;
 435                 sbi_len = 0;
 436         }
 437 }