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