libpcsxcore/cdriso.c

   1 /***************************************************************************
   2  *   Copyright (C) 2007 PCSX-df Team                                       *
   3  *   Copyright (C) 2009 Wei Mingzhi                                        *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin Street, Fifth Floor, Boston, MA 02111-1307 USA.           *
  19  ***************************************************************************/
  20
  21 #include "psxcommon.h"
  22 #include "plugins.h"
  23 #include "cdrom.h"
  24 #include "cdriso.h"
  25 #include "ppf.h"
  26
  27 #ifdef _WIN32
  28 #include <process.h>
  29 #include <windows.h>
  30 #else
  31 #include <pthread.h>
  32 #include <sys/time.h>
  33 #include <unistd.h>
  34 #endif
  35 #include <zlib.h>
  36
  37 unsigned int cdrIsoMultidiskCount;
  38 unsigned int cdrIsoMultidiskSelect;
  39
  40 static FILE *cdHandle = NULL;
  41 static FILE *cddaHandle = NULL;
  42 static FILE *subHandle = NULL;
  43
  44 static boolean subChanMixed = FALSE;
  45 static boolean subChanRaw = FALSE;
  46 static boolean subChanMissing = FALSE;
  47
  48 static unsigned char cdbuffer[DATA_SIZE];
  49 static unsigned char subbuffer[SUB_FRAMESIZE];
  50
  51 static unsigned char sndbuffer[CD_FRAMESIZE_RAW * 10];
  52
  53 #define CDDA_FRAMETIME                  (1000 * (sizeof(sndbuffer) / CD_FRAMESIZE_RAW) / 75)
  54
  55 #ifdef _WIN32
  56 static HANDLE threadid;
  57 #else
  58 static pthread_t threadid;
  59 #endif
  60 static unsigned int initial_offset = 0;
  61 static boolean playing = FALSE;
  62 static boolean cddaBigEndian = FALSE;
  63 // offsets of cddaHandle file
  64 static unsigned int cdda_cur_sector;
  65 static unsigned int cdda_first_sector;
  66 // toc_sector - file_sector
  67 static unsigned int cdda_toc_delta;
  68 /* Frame offset into CD image where pregap data would be found if it was there.
  69  * If a game seeks there we must *not* return subchannel data since it's
  70  * not in the CD image, so that cdrom code can fake subchannel data instead.
  71  * XXX: there could be multiple pregaps but PSX dumps only have one? */
  72 static unsigned int pregapOffset;
  73
  74 // compressed image stuff
  75 static struct {
  76         unsigned char buff_raw[16][CD_FRAMESIZE_RAW];
  77         unsigned char buff_compressed[CD_FRAMESIZE_RAW * 16 + 100];
  78         unsigned int *index_table;
  79         unsigned int index_len;
  80         unsigned int block_shift;
  81         unsigned int current_block;
  82         unsigned int sector_in_blk;
  83 } *compr_img;
  84
  85 int (*cdimg_read_func)(FILE *f, void *dest, int sector, int offset);
  86
  87 char* CALLBACK CDR__getDriveLetter(void);
  88 long CALLBACK CDR__configure(void);
  89 long CALLBACK CDR__test(void);
  90 void CALLBACK CDR__about(void);
  91 long CALLBACK CDR__setfilename(char *filename);
  92 long CALLBACK CDR__getStatus(struct CdrStat *stat);
  93
  94 static void DecodeRawSubData(void);
  95
  96 extern void *hCDRDriver;
  97
  98 struct trackinfo {
  99         enum {DATA, CDDA} type;
 100         char start[3];          // MSF-format
 101         char length[3];         // MSF-format
 102         FILE *handle;           // for multi-track images CDDA
 103         int start_offset;       // sector offset from start of above file
 104 };
 105
 106 #define MAXTRACKS 100 /* How many tracks can a CD hold? */
 107
 108 static int numtracks = 0;
 109 static struct trackinfo ti[MAXTRACKS];
 110
 111 // get a sector from a msf-array
 112 static unsigned int msf2sec(char *msf) {
 113         return ((msf[0] * 60 + msf[1]) * 75) + msf[2];
 114 }
 115
 116 static void sec2msf(unsigned int s, char *msf) {
 117         msf[0] = s / 75 / 60;
 118         s = s - msf[0] * 75 * 60;
 119         msf[1] = s / 75;
 120         s = s - msf[1] * 75;
 121         msf[2] = s;
 122 }
 123
 124 // divide a string of xx:yy:zz into m, s, f
 125 static void tok2msf(char *time, char *msf) {
 126         char *token;
 127
 128         token = strtok(time, ":");
 129         if (token) {
 130                 msf[0] = atoi(token);
 131         }
 132         else {
 133                 msf[0] = 0;
 134         }
 135
 136         token = strtok(NULL, ":");
 137         if (token) {
 138                 msf[1] = atoi(token);
 139         }
 140         else {
 141                 msf[1] = 0;
 142         }
 143
 144         token = strtok(NULL, ":");
 145         if (token) {
 146                 msf[2] = atoi(token);
 147         }
 148         else {
 149                 msf[2] = 0;
 150         }
 151 }
 152
 153 #ifndef _WIN32
 154 static long GetTickCount(void) {
 155         static time_t           initial_time = 0;
 156         struct timeval          now;
 157
 158         gettimeofday(&now, NULL);
 159
 160         if (initial_time == 0) {
 161                 initial_time = now.tv_sec;
 162         }
 163
 164         return (now.tv_sec - initial_time) * 1000L + now.tv_usec / 1000L;
 165 }
 166 #endif
 167
 168 // this thread plays audio data
 169 #ifdef _WIN32
 170 static void playthread(void *param)
 171 #else
 172 static void *playthread(void *param)
 173 #endif
 174 {
 175         long osleep, d, t, i, s;
 176         unsigned char   tmp;
 177         int ret = 0;
 178
 179         t = GetTickCount();
 180
 181         while (playing) {
 182                 s = 0;
 183                 for (i = 0; i < sizeof(sndbuffer) / CD_FRAMESIZE_RAW; i++) {
 184                         d = cdimg_read_func(cddaHandle, sndbuffer + s, cdda_cur_sector, 0);
 185                         if (d < CD_FRAMESIZE_RAW)
 186                                 break;
 187
 188                         if (cdda_cur_sector < cdda_first_sector)
 189                                 memset(sndbuffer + s, 0, CD_FRAMESIZE_RAW);
 190
 191                         s += d;
 192                         cdda_cur_sector++;
 193                 }
 194
 195                 if (s == 0) {
 196                         playing = FALSE;
 197                         initial_offset = 0;
 198                         break;
 199                 }
 200
 201                 if (!cdr.Muted && playing) {
 202                         if (cddaBigEndian) {
 203                                 for (i = 0; i < s / 2; i++) {
 204                                         tmp = sndbuffer[i * 2];
 205                                         sndbuffer[i * 2] = sndbuffer[i * 2 + 1];
 206                                         sndbuffer[i * 2 + 1] = tmp;
 207                                 }
 208                         }
 209
 210                         do {
 211                                 ret = SPU_playCDDAchannel((short *)sndbuffer, s);
 212                                 if (ret == 0x7761)
 213                                         usleep(6 * 1000);
 214                         } while (ret == 0x7761 && playing); // rearmed_wait
 215                 }
 216
 217                 if (ret != 0x676f) { // !rearmed_go
 218                         // do approx sleep
 219                         long now;
 220
 221                         // HACK: stop feeding data while emu is paused
 222                         extern int stop;
 223                         while (stop && playing)
 224                                 usleep(10000);
 225
 226                         now = GetTickCount();
 227                         osleep = t - now;
 228                         if (osleep <= 0) {
 229                                 osleep = 1;
 230                                 t = now;
 231                         }
 232                         else if (osleep > CDDA_FRAMETIME) {
 233                                 osleep = CDDA_FRAMETIME;
 234                                 t = now;
 235                         }
 236
 237                         usleep(osleep * 1000);
 238                         t += CDDA_FRAMETIME;
 239                 }
 240
 241         }
 242
 243 #ifdef _WIN32
 244         _endthread();
 245 #else
 246         pthread_exit(0);
 247         return NULL;
 248 #endif
 249 }
 250
 251 // stop the CDDA playback
 252 static void stopCDDA() {
 253         if (!playing) {
 254                 return;
 255         }
 256
 257         playing = FALSE;
 258 #ifdef _WIN32
 259         WaitForSingleObject(threadid, INFINITE);
 260 #else
 261         pthread_join(threadid, NULL);
 262 #endif
 263 }
 264
 265 // start the CDDA playback
 266 static void startCDDA(unsigned int sector) {
 267         if (playing) {
 268                 stopCDDA();
 269         }
 270
 271         cdda_cur_sector = sector;
 272         playing = TRUE;
 273
 274 #ifdef _WIN32
 275         threadid = (HANDLE)_beginthread(playthread, 0, NULL);
 276 #else
 277         pthread_create(&threadid, NULL, playthread, NULL);
 278 #endif
 279 }
 280
 281 // this function tries to get the .toc file of the given .bin
 282 // the necessary data is put into the ti (trackinformation)-array
 283 static int parsetoc(const char *isofile) {
 284         char                    tocname[MAXPATHLEN];
 285         FILE                    *fi;
 286         char                    linebuf[256], dummy[256], name[256];
 287         char                    *token;
 288         char                    time[20], time2[20];
 289         unsigned int    t, sector_offs;
 290
 291         numtracks = 0;
 292
 293         // copy name of the iso and change extension from .bin to .toc
 294         strncpy(tocname, isofile, sizeof(tocname));
 295         tocname[MAXPATHLEN - 1] = '\0';
 296         if (strlen(tocname) >= 4) {
 297                 strcpy(tocname + strlen(tocname) - 4, ".toc");
 298         }
 299         else {
 300                 return -1;
 301         }
 302
 303         if ((fi = fopen(tocname, "r")) == NULL) {
 304                 // try changing extension to .cue (to satisfy some stupid tutorials)
 305                 strcpy(tocname + strlen(tocname) - 4, ".cue");
 306                 if ((fi = fopen(tocname, "r")) == NULL) {
 307                         // if filename is image.toc.bin, try removing .bin (for Brasero)
 308                         strcpy(tocname, isofile);
 309                         t = strlen(tocname);
 310                         if (t >= 8 && strcmp(tocname + t - 8, ".toc.bin") == 0) {
 311                                 tocname[t - 4] = '\0';
 312                                 if ((fi = fopen(tocname, "r")) == NULL) {
 313                                         return -1;
 314                                 }
 315                         }
 316                         else {
 317                                 return -1;
 318                         }
 319                 }
 320         }
 321
 322         memset(&ti, 0, sizeof(ti));
 323         cddaBigEndian = TRUE; // cdrdao uses big-endian for CD Audio
 324
 325         sector_offs = 2 * 75;
 326
 327         // parse the .toc file
 328         while (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 329                 // search for tracks
 330                 strncpy(dummy, linebuf, sizeof(linebuf));
 331                 token = strtok(dummy, " ");
 332
 333                 if (token == NULL) continue;
 334
 335                 if (!strcmp(token, "TRACK")) {
 336                         // get type of track
 337                         token = strtok(NULL, " ");
 338                         numtracks++;
 339
 340                         if (!strncmp(token, "MODE2_RAW", 9)) {
 341                                 ti[numtracks].type = DATA;
 342                                 sec2msf(2 * 75, ti[numtracks].start); // assume data track on 0:2:0
 343
 344                                 // check if this image contains mixed subchannel data
 345                                 token = strtok(NULL, " ");
 346                                 if (token != NULL && !strncmp(token, "RW_RAW", 6)) {
 347                                         subChanMixed = TRUE;
 348                                         subChanRaw = TRUE;
 349                                 }
 350                         }
 351                         else if (!strncmp(token, "AUDIO", 5)) {
 352                                 ti[numtracks].type = CDDA;
 353                         }
 354                 }
 355                 else if (!strcmp(token, "DATAFILE")) {
 356                         if (ti[numtracks].type == CDDA) {
 357                                 sscanf(linebuf, "DATAFILE \"%[^\"]\" #%d %8s", name, &t, time2);
 358                                 t /= CD_FRAMESIZE_RAW + (subChanMixed ? SUB_FRAMESIZE : 0);
 359                                 ti[numtracks].start_offset = t;
 360                                 t += sector_offs;
 361                                 sec2msf(t, (char *)&ti[numtracks].start);
 362                                 tok2msf((char *)&time2, (char *)&ti[numtracks].length);
 363                         }
 364                         else {
 365                                 sscanf(linebuf, "DATAFILE \"%[^\"]\" %8s", name, time);
 366                                 tok2msf((char *)&time, (char *)&ti[numtracks].length);
 367                         }
 368                 }
 369                 else if (!strcmp(token, "FILE")) {
 370                         sscanf(linebuf, "FILE \"%[^\"]\" #%d %8s %8s", name, &t, time, time2);
 371                         tok2msf((char *)&time, (char *)&ti[numtracks].start);
 372                         t /= CD_FRAMESIZE_RAW + (subChanMixed ? SUB_FRAMESIZE : 0);
 373                         ti[numtracks].start_offset = t;
 374                         t += msf2sec(ti[numtracks].start) + sector_offs;
 375                         sec2msf(t, (char *)&ti[numtracks].start);
 376                         tok2msf((char *)&time2, (char *)&ti[numtracks].length);
 377                 }
 378                 else if (!strcmp(token, "ZERO")) {
 379                         sscanf(linebuf, "ZERO AUDIO RW_RAW %8s", time);
 380                         tok2msf((char *)&time, dummy);
 381                         sector_offs += msf2sec(dummy);
 382                         if (numtracks > 1) {
 383                                 t = ti[numtracks - 1].start_offset;
 384                                 pregapOffset = t + msf2sec(ti[numtracks - 1].length);
 385                         }
 386                 }
 387         }
 388
 389         fclose(fi);
 390
 391         return 0;
 392 }
 393
 394 // this function tries to get the .cue file of the given .bin
 395 // the necessary data is put into the ti (trackinformation)-array
 396 static int parsecue(const char *isofile) {
 397         char                    cuename[MAXPATHLEN];
 398         char                    filepath[MAXPATHLEN];
 399         char                    *incue_fname;
 400         FILE                    *fi;
 401         char                    *token;
 402         char                    time[20];
 403         char                    *tmp;
 404         char                    linebuf[256], tmpb[256], dummy[256];
 405         unsigned int    incue_max_len;
 406         unsigned int    t, file_len, sector_offs;
 407
 408         numtracks = 0;
 409
 410         // copy name of the iso and change extension from .bin to .cue
 411         strncpy(cuename, isofile, sizeof(cuename));
 412         cuename[MAXPATHLEN - 1] = '\0';
 413         if (strlen(cuename) >= 4) {
 414                 strcpy(cuename + strlen(cuename) - 4, ".cue");
 415         }
 416         else {
 417                 return -1;
 418         }
 419
 420         if ((fi = fopen(cuename, "r")) == NULL) {
 421                 return -1;
 422         }
 423
 424         // Some stupid tutorials wrongly tell users to use cdrdao to rip a
 425         // "bin/cue" image, which is in fact a "bin/toc" image. So let's check
 426         // that...
 427         if (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 428                 if (!strncmp(linebuf, "CD_ROM_XA", 9)) {
 429                         // Don't proceed further, as this is actually a .toc file rather
 430                         // than a .cue file.
 431                         fclose(fi);
 432                         return parsetoc(isofile);
 433                 }
 434                 fseek(fi, 0, SEEK_SET);
 435         }
 436
 437         // build a path for files referenced in .cue
 438         strncpy(filepath, cuename, sizeof(filepath));
 439         tmp = strrchr(filepath, '/') + 1;
 440         if (tmp == NULL)
 441                 tmp = strrchr(filepath, '\\') + 1;
 442         if (tmp == NULL)
 443                 tmp = filepath;
 444         *tmp = 0;
 445         filepath[sizeof(filepath) - 1] = 0;
 446         incue_fname = tmp;
 447         incue_max_len = sizeof(filepath) - (tmp - filepath) - 1;
 448
 449         memset(&ti, 0, sizeof(ti));
 450
 451         file_len = 0;
 452         sector_offs = 2 * 75;
 453
 454         while (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 455                 strncpy(dummy, linebuf, sizeof(linebuf));
 456                 token = strtok(dummy, " ");
 457
 458                 if (token == NULL) {
 459                         continue;
 460                 }
 461
 462                 if (!strcmp(token, "TRACK")) {
 463                         numtracks++;
 464
 465                         if (strstr(linebuf, "AUDIO") != NULL) {
 466                                 ti[numtracks].type = CDDA;
 467                         }
 468                         else if (strstr(linebuf, "MODE1/2352") != NULL || strstr(linebuf, "MODE2/2352") != NULL) {
 469                                 ti[numtracks].type = DATA;
 470                         }
 471                 }
 472                 else if (!strcmp(token, "INDEX")) {
 473                         sscanf(linebuf, " INDEX %02d %8s", &t, time);
 474                         tok2msf(time, (char *)&ti[numtracks].start);
 475
 476                         t = msf2sec(ti[numtracks].start);
 477                         ti[numtracks].start_offset = t;
 478                         t += sector_offs;
 479                         sec2msf(t, ti[numtracks].start);
 480
 481                         // default track length to file length
 482                         t = file_len - ti[numtracks].start_offset;
 483                         sec2msf(t, ti[numtracks].length);
 484
 485                         if (numtracks > 1 && ti[numtracks].handle == NULL) {
 486                                 // this track uses the same file as the last,
 487                                 // start of this track is last track's end
 488                                 t = msf2sec(ti[numtracks].start) - msf2sec(ti[numtracks - 1].start);
 489                                 sec2msf(t, ti[numtracks - 1].length);
 490                         }
 491                         if (numtracks > 1 && pregapOffset == -1)
 492                                 pregapOffset = ti[numtracks].start_offset;
 493                 }
 494                 else if (!strcmp(token, "PREGAP")) {
 495                         if (sscanf(linebuf, " PREGAP %8s", time) == 1) {
 496                                 tok2msf(time, dummy);
 497                                 sector_offs += msf2sec(dummy);
 498                         }
 499                         pregapOffset = -1; // mark to fill track start_offset
 500                 }
 501                 else if (!strcmp(token, "FILE")) {
 502                         t = sscanf(linebuf, " FILE \"%256[^\"]\"", tmpb);
 503                         if (t != 1)
 504                                 sscanf(linebuf, " FILE %256s", tmpb);
 505
 506                         // absolute path?
 507                         ti[numtracks + 1].handle = fopen(tmpb, "rb");
 508                         if (ti[numtracks + 1].handle == NULL) {
 509                                 // relative to .cue?
 510                                 tmp = strrchr(tmpb, '\\');
 511                                 if (tmp == NULL)
 512                                         tmp = strrchr(tmpb, '/');
 513                                 if (tmp != NULL)
 514                                         tmp++;
 515                                 else
 516                                         tmp = tmpb;
 517                                 strncpy(incue_fname, tmp, incue_max_len);
 518                                 ti[numtracks + 1].handle = fopen(filepath, "rb");
 519                         }
 520
 521                         // update global offset if this is not first file in this .cue
 522                         if (numtracks + 1 > 1)
 523                                 sector_offs += file_len;
 524
 525                         file_len = 0;
 526                         if (ti[numtracks + 1].handle == NULL) {
 527                                 SysPrintf(_("\ncould not open: %s\n"), filepath);
 528                                 continue;
 529                         }
 530                         fseek(ti[numtracks + 1].handle, 0, SEEK_END);
 531                         file_len = ftell(ti[numtracks + 1].handle) / 2352;
 532
 533                         if (numtracks == 0 && strlen(isofile) >= 4 &&
 534                                 strcmp(isofile + strlen(isofile) - 4, ".cue") == 0)
 535                         {
 536                                 // user selected .cue as image file, use it's data track instead
 537                                 fclose(cdHandle);
 538                                 cdHandle = fopen(filepath, "rb");
 539                         }
 540                 }
 541         }
 542
 543         fclose(fi);
 544
 545         return 0;
 546 }
 547
 548 // this function tries to get the .ccd file of the given .img
 549 // the necessary data is put into the ti (trackinformation)-array
 550 static int parseccd(const char *isofile) {
 551         char                    ccdname[MAXPATHLEN];
 552         FILE                    *fi;
 553         char                    linebuf[256];
 554         unsigned int    t;
 555
 556         numtracks = 0;
 557
 558         // copy name of the iso and change extension from .img to .ccd
 559         strncpy(ccdname, isofile, sizeof(ccdname));
 560         ccdname[MAXPATHLEN - 1] = '\0';
 561         if (strlen(ccdname) >= 4) {
 562                 strcpy(ccdname + strlen(ccdname) - 4, ".ccd");
 563         }
 564         else {
 565                 return -1;
 566         }
 567
 568         if ((fi = fopen(ccdname, "r")) == NULL) {
 569                 return -1;
 570         }
 571
 572         memset(&ti, 0, sizeof(ti));
 573
 574         while (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 575                 if (!strncmp(linebuf, "[TRACK", 6)){
 576                         numtracks++;
 577                 }
 578                 else if (!strncmp(linebuf, "MODE=", 5)) {
 579                         sscanf(linebuf, "MODE=%d", &t);
 580                         ti[numtracks].type = ((t == 0) ? CDDA : DATA);
 581                 }
 582                 else if (!strncmp(linebuf, "INDEX 1=", 8)) {
 583                         sscanf(linebuf, "INDEX 1=%d", &t);
 584                         sec2msf(t + 2 * 75, ti[numtracks].start);
 585                         ti[numtracks].start_offset = t;
 586
 587                         // If we've already seen another track, this is its end
 588                         if (numtracks > 1) {
 589                                 t = msf2sec(ti[numtracks].start) - msf2sec(ti[numtracks - 1].start);
 590                                 sec2msf(t, ti[numtracks - 1].length);
 591                         }
 592                 }
 593         }
 594
 595         fclose(fi);
 596
 597         // Fill out the last track's end based on size
 598         if (numtracks >= 1) {
 599                 fseek(cdHandle, 0, SEEK_END);
 600                 t = ftell(cdHandle) / 2352 - msf2sec(ti[numtracks].start) + 2 * 75;
 601                 sec2msf(t, ti[numtracks].length);
 602         }
 603
 604         return 0;
 605 }
 606
 607 // this function tries to get the .mds file of the given .mdf
 608 // the necessary data is put into the ti (trackinformation)-array
 609 static int parsemds(const char *isofile) {
 610         char                    mdsname[MAXPATHLEN];
 611         FILE                    *fi;
 612         unsigned int    offset, extra_offset, l, i;
 613         unsigned short  s;
 614
 615         numtracks = 0;
 616
 617         // copy name of the iso and change extension from .mdf to .mds
 618         strncpy(mdsname, isofile, sizeof(mdsname));
 619         mdsname[MAXPATHLEN - 1] = '\0';
 620         if (strlen(mdsname) >= 4) {
 621                 strcpy(mdsname + strlen(mdsname) - 4, ".mds");
 622         }
 623         else {
 624                 return -1;
 625         }
 626
 627         if ((fi = fopen(mdsname, "rb")) == NULL) {
 628                 return -1;
 629         }
 630
 631         memset(&ti, 0, sizeof(ti));
 632
 633         // check if it's a valid mds file
 634         fread(&i, 1, sizeof(unsigned int), fi);
 635         i = SWAP32(i);
 636         if (i != 0x4944454D) {
 637                 // not an valid mds file
 638                 fclose(fi);
 639                 return -1;
 640         }
 641
 642         // get offset to session block
 643         fseek(fi, 0x50, SEEK_SET);
 644         fread(&offset, 1, sizeof(unsigned int), fi);
 645         offset = SWAP32(offset);
 646
 647         // get total number of tracks
 648         offset += 14;
 649         fseek(fi, offset, SEEK_SET);
 650         fread(&s, 1, sizeof(unsigned short), fi);
 651         s = SWAP16(s);
 652         numtracks = s;
 653
 654         // get offset to track blocks
 655         fseek(fi, 4, SEEK_CUR);
 656         fread(&offset, 1, sizeof(unsigned int), fi);
 657         offset = SWAP32(offset);
 658
 659         // skip lead-in data
 660         while (1) {
 661                 fseek(fi, offset + 4, SEEK_SET);
 662                 if (fgetc(fi) < 0xA0) {
 663                         break;
 664                 }
 665                 offset += 0x50;
 666         }
 667
 668         // check if the image contains mixed subchannel data
 669         fseek(fi, offset + 1, SEEK_SET);
 670         subChanMixed = (fgetc(fi) ? TRUE : FALSE);
 671
 672         // read track data
 673         for (i = 1; i <= numtracks; i++) {
 674                 fseek(fi, offset, SEEK_SET);
 675
 676                 // get the track type
 677                 ti[i].type = ((fgetc(fi) == 0xA9) ? CDDA : DATA);
 678                 fseek(fi, 8, SEEK_CUR);
 679
 680                 // get the track starting point
 681                 ti[i].start[0] = fgetc(fi);
 682                 ti[i].start[1] = fgetc(fi);
 683                 ti[i].start[2] = fgetc(fi);
 684
 685                 fread(&extra_offset, 1, sizeof(unsigned int), fi);
 686                 extra_offset = SWAP32(extra_offset);
 687
 688                 // get track start offset (in .mdf)
 689                 fseek(fi, offset + 0x28, SEEK_SET);
 690                 fread(&l, 1, sizeof(unsigned int), fi);
 691                 l = SWAP32(l);
 692                 ti[i].start_offset = l / CD_FRAMESIZE_RAW;
 693
 694                 // get pregap
 695                 fseek(fi, extra_offset, SEEK_SET);
 696                 fread(&l, 1, sizeof(unsigned int), fi);
 697                 l = SWAP32(l);
 698                 if (l != 0 && i > 1)
 699                         pregapOffset = ti[i].start_offset;
 700
 701                 // get the track length
 702                 fread(&l, 1, sizeof(unsigned int), fi);
 703                 l = SWAP32(l);
 704                 sec2msf(l, ti[i].length);
 705
 706                 offset += 0x50;
 707         }
 708
 709         fclose(fi);
 710         return 0;
 711 }
 712
 713 static int handlepbp(const char *isofile) {
 714         struct {
 715                 unsigned int sig;
 716                 unsigned int dontcare[8];
 717                 unsigned int psar_offs;
 718         } pbp_hdr;
 719         struct {
 720                 unsigned char type;
 721                 unsigned char pad0;
 722                 unsigned char track;
 723                 char index0[3];
 724                 char pad1;
 725                 char index1[3];
 726         } toc_entry;
 727         struct {
 728                 unsigned int offset;
 729                 unsigned int size;
 730                 unsigned int dontcare[6];
 731         } index_entry;
 732         char psar_sig[11];
 733         unsigned int t, cd_length, cdimg_base;
 734         unsigned int offsettab[8], psisoimg_offs;
 735         const char *ext = NULL;
 736         int i, ret;
 737
 738         if (strlen(isofile) >= 4)
 739                 ext = isofile + strlen(isofile) - 4;
 740         if (ext == NULL || (strcmp(ext, ".pbp") != 0 && strcmp(ext, ".PBP") != 0))
 741                 return -1;
 742
 743         numtracks = 0;
 744
 745         ret = fread(&pbp_hdr, 1, sizeof(pbp_hdr), cdHandle);
 746         if (ret != sizeof(pbp_hdr)) {
 747                 SysPrintf("failed to read pbp\n");
 748                 goto fail_io;
 749         }
 750
 751         ret = fseek(cdHandle, pbp_hdr.psar_offs, SEEK_SET);
 752         if (ret != 0) {
 753                 SysPrintf("failed to seek to %x\n", pbp_hdr.psar_offs);
 754                 goto fail_io;
 755         }
 756
 757         psisoimg_offs = pbp_hdr.psar_offs;
 758         fread(psar_sig, 1, sizeof(psar_sig), cdHandle);
 759         psar_sig[10] = 0;
 760         if (strcmp(psar_sig, "PSTITLEIMG") == 0) {
 761                 // multidisk image?
 762                 ret = fseek(cdHandle, pbp_hdr.psar_offs + 0x200, SEEK_SET);
 763                 if (ret != 0) {
 764                         SysPrintf("failed to seek to %x\n", pbp_hdr.psar_offs + 0x200);
 765                         goto fail_io;
 766                 }
 767
 768                 if (fread(&offsettab, 1, sizeof(offsettab), cdHandle) != sizeof(offsettab)) {
 769                         SysPrintf("failed to read offsettab\n");
 770                         goto fail_io;
 771                 }
 772
 773                 for (i = 0; i < sizeof(offsettab) / sizeof(offsettab[0]); i++) {
 774                         if (offsettab[i] == 0)
 775                                 break;
 776                 }
 777                 cdrIsoMultidiskCount = i;
 778                 if (cdrIsoMultidiskCount == 0) {
 779                         SysPrintf("multidisk eboot has 0 images?\n");
 780                         goto fail_io;
 781                 }
 782
 783                 if (cdrIsoMultidiskSelect >= cdrIsoMultidiskCount)
 784                         cdrIsoMultidiskSelect = 0;
 785
 786                 psisoimg_offs += offsettab[cdrIsoMultidiskSelect];
 787
 788                 ret = fseek(cdHandle, psisoimg_offs, SEEK_SET);
 789                 if (ret != 0) {
 790                         SysPrintf("failed to seek to %x\n", psisoimg_offs);
 791                         goto fail_io;
 792                 }
 793
 794                 fread(psar_sig, 1, sizeof(psar_sig), cdHandle);
 795                 psar_sig[10] = 0;
 796         }
 797
 798         if (strcmp(psar_sig, "PSISOIMG00") != 0) {
 799                 SysPrintf("bad psar_sig: %s\n", psar_sig);
 800                 goto fail_io;
 801         }
 802
 803         // seek to TOC
 804         ret = fseek(cdHandle, psisoimg_offs + 0x800, SEEK_SET);
 805         if (ret != 0) {
 806                 SysPrintf("failed to seek to %x\n", psisoimg_offs + 0x800);
 807                 goto fail_io;
 808         }
 809
 810         // first 3 entries are special
 811         fseek(cdHandle, sizeof(toc_entry), SEEK_CUR);
 812         fread(&toc_entry, 1, sizeof(toc_entry), cdHandle);
 813         numtracks = btoi(toc_entry.index1[0]);
 814
 815         fread(&toc_entry, 1, sizeof(toc_entry), cdHandle);
 816         cd_length = btoi(toc_entry.index1[0]) * 60 * 75 +
 817                 btoi(toc_entry.index1[1]) * 75 + btoi(toc_entry.index1[2]);
 818
 819         for (i = 1; i <= numtracks; i++) {
 820                 fread(&toc_entry, 1, sizeof(toc_entry), cdHandle);
 821
 822                 ti[i].type = (toc_entry.type == 1) ? CDDA : DATA;
 823
 824                 ti[i].start_offset = btoi(toc_entry.index0[0]) * 60 * 75 +
 825                         btoi(toc_entry.index0[1]) * 75 + btoi(toc_entry.index0[2]);
 826                 ti[i].start[0] = btoi(toc_entry.index1[0]);
 827                 ti[i].start[1] = btoi(toc_entry.index1[1]);
 828                 ti[i].start[2] = btoi(toc_entry.index1[2]);
 829
 830                 if (i > 1) {
 831                         t = msf2sec(ti[i].start) - msf2sec(ti[i - 1].start);
 832                         sec2msf(t, ti[i - 1].length);
 833                 }
 834         }
 835         t = cd_length - ti[numtracks].start_offset;
 836         sec2msf(t, ti[numtracks].length);
 837
 838         // seek to ISO index
 839         ret = fseek(cdHandle, psisoimg_offs + 0x4000, SEEK_SET);
 840         if (ret != 0) {
 841                 SysPrintf("failed to seek to ISO index\n");
 842                 goto fail_io;
 843         }
 844
 845         compr_img = calloc(1, sizeof(*compr_img));
 846         if (compr_img == NULL)
 847                 goto fail_io;
 848
 849         compr_img->block_shift = 4;
 850         compr_img->current_block = (unsigned int)-1;
 851
 852         compr_img->index_len = (0x100000 - 0x4000) / sizeof(index_entry);
 853         compr_img->index_table = malloc((compr_img->index_len + 1) * sizeof(compr_img->index_table[0]));
 854         if (compr_img->index_table == NULL)
 855                 goto fail_io;
 856
 857         cdimg_base = psisoimg_offs + 0x100000;
 858         for (i = 0; i < compr_img->index_len; i++) {
 859                 ret = fread(&index_entry, 1, sizeof(index_entry), cdHandle);
 860                 if (ret != sizeof(index_entry)) {
 861                         SysPrintf("failed to read index_entry #%d\n", i);
 862                         goto fail_index;
 863                 }
 864
 865                 if (index_entry.size == 0)
 866                         break;
 867
 868                 compr_img->index_table[i] = cdimg_base + index_entry.offset;
 869         }
 870         compr_img->index_table[i] = cdimg_base + index_entry.offset + index_entry.size;
 871
 872         return 0;
 873
 874 fail_index:
 875         free(compr_img->index_table);
 876         compr_img->index_table = NULL;
 877 fail_io:
 878         if (compr_img != NULL) {
 879                 free(compr_img);
 880                 compr_img = NULL;
 881         }
 882         return -1;
 883 }
 884
 885 static int handlecbin(const char *isofile) {
 886         struct
 887         {
 888                 char magic[4];
 889                 unsigned int header_size;
 890                 unsigned long long total_bytes;
 891                 unsigned int block_size;
 892                 unsigned char ver;              // 1
 893                 unsigned char align;
 894                 unsigned char rsv_06[2];
 895         } ciso_hdr;
 896         const char *ext = NULL;
 897         unsigned int index = 0, plain;
 898         int i, ret;
 899
 900         if (strlen(isofile) >= 5)
 901                 ext = isofile + strlen(isofile) - 5;
 902         if (ext == NULL || (strcasecmp(ext + 1, ".cbn") != 0 && strcasecmp(ext, ".cbin") != 0))
 903                 return -1;
 904
 905         ret = fread(&ciso_hdr, 1, sizeof(ciso_hdr), cdHandle);
 906         if (ret != sizeof(ciso_hdr)) {
 907                 SysPrintf("failed to read ciso header\n");
 908                 return -1;
 909         }
 910
 911         if (strncmp(ciso_hdr.magic, "CISO", 4) != 0 || ciso_hdr.total_bytes <= 0 || ciso_hdr.block_size <= 0) {
 912                 SysPrintf("bad ciso header\n");
 913                 return -1;
 914         }
 915         if (ciso_hdr.header_size != 0 && ciso_hdr.header_size != sizeof(ciso_hdr)) {
 916                 ret = fseek(cdHandle, ciso_hdr.header_size, SEEK_SET);
 917                 if (ret != 0) {
 918                         SysPrintf("failed to seek to %x\n", ciso_hdr.header_size);
 919                         return -1;
 920                 }
 921         }
 922
 923         compr_img = calloc(1, sizeof(*compr_img));
 924         if (compr_img == NULL)
 925                 goto fail_io;
 926
 927         compr_img->block_shift = 0;
 928         compr_img->current_block = (unsigned int)-1;
 929
 930         compr_img->index_len = ciso_hdr.total_bytes / ciso_hdr.block_size;
 931         compr_img->index_table = malloc((compr_img->index_len + 1) * sizeof(compr_img->index_table[0]));
 932         if (compr_img->index_table == NULL)
 933                 goto fail_io;
 934
 935         ret = fread(compr_img->index_table, sizeof(compr_img->index_table[0]), compr_img->index_len, cdHandle);
 936         if (ret != compr_img->index_len) {
 937                 SysPrintf("failed to read index table\n");
 938                 goto fail_index;
 939         }
 940
 941         for (i = 0; i < compr_img->index_len + 1; i++) {
 942                 index = compr_img->index_table[i];
 943                 plain = index & 0x80000000;
 944                 index &= 0x7fffffff;
 945                 compr_img->index_table[i] = (index << ciso_hdr.align) | plain;
 946         }
 947         if ((long long)index << ciso_hdr.align >= 0x80000000ll)
 948                 SysPrintf("warning: ciso img too large, expect problems\n");
 949
 950         return 0;
 951
 952 fail_index:
 953         free(compr_img->index_table);
 954         compr_img->index_table = NULL;
 955 fail_io:
 956         if (compr_img != NULL) {
 957                 free(compr_img);
 958                 compr_img = NULL;
 959         }
 960         return -1;
 961 }
 962
 963 // this function tries to get the .sub file of the given .img
 964 static int opensubfile(const char *isoname) {
 965         char            subname[MAXPATHLEN];
 966
 967         // copy name of the iso and change extension from .img to .sub
 968         strncpy(subname, isoname, sizeof(subname));
 969         subname[MAXPATHLEN - 1] = '\0';
 970         if (strlen(subname) >= 4) {
 971                 strcpy(subname + strlen(subname) - 4, ".sub");
 972         }
 973         else {
 974                 return -1;
 975         }
 976
 977         subHandle = fopen(subname, "rb");
 978         if (subHandle == NULL) {
 979                 return -1;
 980         }
 981
 982         return 0;
 983 }
 984
 985 static int opensbifile(const char *isoname) {
 986         char            sbiname[MAXPATHLEN];
 987         int             s;
 988
 989         strncpy(sbiname, isoname, sizeof(sbiname));
 990         sbiname[MAXPATHLEN - 1] = '\0';
 991         if (strlen(sbiname) >= 4) {
 992                 strcpy(sbiname + strlen(sbiname) - 4, ".sbi");
 993         }
 994         else {
 995                 return -1;
 996         }
 997
 998         fseek(cdHandle, 0, SEEK_END);
 999         s = ftell(cdHandle) / 2352;
1000
1001         return LoadSBI(sbiname, s);
1002 }
1003
1004 static int cdread_normal(FILE *f, void *dest, int sector, int offset)
1005 {
1006         fseek(f, sector * CD_FRAMESIZE_RAW + offset, SEEK_SET);
1007         return fread(dest, 1, CD_FRAMESIZE_RAW - offset, f);
1008 }
1009
1010 static int cdread_sub_mixed(FILE *f, void *dest, int sector, int offset)
1011 {
1012         int ret;
1013
1014         fseek(f, sector * (CD_FRAMESIZE_RAW + SUB_FRAMESIZE) + offset, SEEK_SET);
1015         ret = fread(dest, 1, CD_FRAMESIZE_RAW - offset, f);
1016         fread(subbuffer, 1, SUB_FRAMESIZE, f);
1017
1018         if (subChanRaw) DecodeRawSubData();
1019
1020         return ret;
1021 }
1022
1023 static int uncompress2(void *out, unsigned long *out_size, void *in, unsigned long in_size)
1024 {
1025         static z_stream z;
1026         int ret = 0;
1027
1028         if (z.zalloc == NULL) {
1029                 // XXX: one-time leak here..
1030                 z.next_in = Z_NULL;
1031                 z.avail_in = 0;
1032                 z.zalloc = Z_NULL;
1033                 z.zfree = Z_NULL;
1034                 z.opaque = Z_NULL;
1035                 ret = inflateInit2(&z, -15);
1036         }
1037         else
1038                 ret = inflateReset(&z);
1039         if (ret != Z_OK)
1040                 return ret;
1041
1042         z.next_in = in;
1043         z.avail_in = in_size;
1044         z.next_out = out;
1045         z.avail_out = *out_size;
1046
1047         ret = inflate(&z, Z_NO_FLUSH);
1048         //inflateEnd(&z);
1049
1050         *out_size -= z.avail_out;
1051         return ret == 1 ? 0 : ret;
1052 }
1053
1054 static int cdread_compressed(FILE *f, void *dest, int sector, int offset)
1055 {
1056         unsigned long cdbuffer_size, cdbuffer_size_expect;
1057         unsigned int start_byte, size;
1058         int is_compressed;
1059         int ret, block;
1060
1061         block = sector >> compr_img->block_shift;
1062         compr_img->sector_in_blk = sector & ((1 << compr_img->block_shift) - 1);
1063
1064         if (block == compr_img->current_block) {
1065                 //printf("hit sect %d\n", sector);
1066                 goto finish;
1067         }
1068
1069         if (sector >= compr_img->index_len * 16) {
1070                 SysPrintf("sector %d is past img end\n", sector);
1071                 return -1;
1072         }
1073
1074         start_byte = compr_img->index_table[block] & 0x7fffffff;
1075         if (fseek(cdHandle, start_byte, SEEK_SET) != 0) {
1076                 SysPrintf("seek error for block %d at %x: ",
1077                         block, start_byte);
1078                 perror(NULL);
1079                 return -1;
1080         }
1081
1082         is_compressed = !(compr_img->index_table[block] & 0x80000000);
1083         size = (compr_img->index_table[block + 1] & 0x7fffffff) - start_byte;
1084         if (size > sizeof(compr_img->buff_compressed)) {
1085                 SysPrintf("block %d is too large: %u\n", block, size);
1086                 return -1;
1087         }
1088
1089         if (fread(is_compressed ? compr_img->buff_compressed : compr_img->buff_raw[0],
1090                                 1, size, cdHandle) != size) {
1091                 SysPrintf("read error for block %d at %x: ", block, start_byte);
1092                 perror(NULL);
1093                 return -1;
1094         }
1095
1096         if (is_compressed) {
1097                 cdbuffer_size_expect = sizeof(compr_img->buff_raw[0]) << compr_img->block_shift;
1098                 cdbuffer_size = cdbuffer_size_expect;
1099                 ret = uncompress2(compr_img->buff_raw[0], &cdbuffer_size, compr_img->buff_compressed, size);
1100                 if (ret != 0) {
1101                         SysPrintf("uncompress failed with %d for block %d, sector %d\n",
1102                                         ret, block, sector);
1103                         return -1;
1104                 }
1105                 if (cdbuffer_size != cdbuffer_size_expect)
1106                         SysPrintf("cdbuffer_size: %lu != %lu, sector %d\n", cdbuffer_size,
1107                                         cdbuffer_size_expect, sector);
1108         }
1109
1110         // done at last!
1111         compr_img->current_block = block;
1112
1113 finish:
1114         if (dest != cdbuffer) // copy avoid HACK
1115                 memcpy(dest, compr_img->buff_raw[compr_img->sector_in_blk] + offset,
1116                         CD_FRAMESIZE_RAW - offset);
1117         return CD_FRAMESIZE_RAW - offset;
1118 }
1119
1120 static int cdread_2048(FILE *f, void *dest, int sector, int offset)
1121 {
1122         int ret;
1123
1124         fseek(f, sector * 2048, SEEK_SET);
1125         ret = fread((char *)dest + 12, 1, 2048, f);
1126
1127         // not really necessary, fake mode 2 header
1128         memset(cdbuffer, 0, 12);
1129         sec2msf(sector + 2 * 75, (char *)cdbuffer);
1130         cdbuffer[3] = 1;
1131
1132         return ret;
1133 }
1134
1135 static unsigned char * CALLBACK ISOgetBuffer_compr(void) {
1136         return compr_img->buff_raw[compr_img->sector_in_blk] + 12;
1137 }
1138
1139 static unsigned char * CALLBACK ISOgetBuffer(void) {
1140         return cdbuffer;
1141 }
1142
1143 static void PrintTracks(void) {
1144         int i;
1145
1146         for (i = 1; i <= numtracks; i++) {
1147                 SysPrintf(_("Track %.2d (%s) - Start %.2d:%.2d:%.2d, Length %.2d:%.2d:%.2d\n"),
1148                         i, (ti[i].type == DATA ? "DATA" : "AUDIO"),
1149                         ti[i].start[0], ti[i].start[1], ti[i].start[2],
1150                         ti[i].length[0], ti[i].length[1], ti[i].length[2]);
1151         }
1152 }
1153
1154 // This function is invoked by the front-end when opening an ISO
1155 // file for playback
1156 static long CALLBACK ISOopen(void) {
1157         boolean isMode1ISO = FALSE;
1158
1159         if (cdHandle != NULL) {
1160                 return 0; // it's already open
1161         }
1162
1163         cdHandle = fopen(GetIsoFile(), "rb");
1164         if (cdHandle == NULL) {
1165                 return -1;
1166         }
1167
1168         SysPrintf(_("Loaded CD Image: %s"), GetIsoFile());
1169
1170         cddaBigEndian = FALSE;
1171         subChanMixed = FALSE;
1172         subChanRaw = FALSE;
1173         pregapOffset = 0;
1174         cdrIsoMultidiskCount = 1;
1175
1176         CDR_getBuffer = ISOgetBuffer;
1177         cdimg_read_func = cdread_normal;
1178
1179         if (parsecue(GetIsoFile()) == 0) {
1180                 SysPrintf("[+cue]");
1181         }
1182         else if (parsetoc(GetIsoFile()) == 0) {
1183                 SysPrintf("[+toc]");
1184         }
1185         else if (parseccd(GetIsoFile()) == 0) {
1186                 SysPrintf("[+ccd]");
1187         }
1188         else if (parsemds(GetIsoFile()) == 0) {
1189                 SysPrintf("[+mds]");
1190         }
1191         if (handlepbp(GetIsoFile()) == 0) {
1192                 SysPrintf("[pbp]");
1193                 CDR_getBuffer = ISOgetBuffer_compr;
1194                 cdimg_read_func = cdread_compressed;
1195         }
1196         else if (handlecbin(GetIsoFile()) == 0) {
1197                 SysPrintf("[cbin]");
1198                 CDR_getBuffer = ISOgetBuffer_compr;
1199                 cdimg_read_func = cdread_compressed;
1200         }
1201
1202         if (!subChanMixed && opensubfile(GetIsoFile()) == 0) {
1203                 SysPrintf("[+sub]");
1204         }
1205         if (opensbifile(GetIsoFile()) == 0) {
1206                 SysPrintf("[+sbi]");
1207         }
1208
1209         // guess whether it is mode1/2048
1210         fseek(cdHandle, 0, SEEK_END);
1211         if (ftell(cdHandle) % 2048 == 0) {
1212                 unsigned int modeTest = 0;
1213                 fseek(cdHandle, 0, SEEK_SET);
1214                 fread(&modeTest, 4, 1, cdHandle);
1215                 if (SWAP32(modeTest) != 0xffffff00) {
1216                         SysPrintf("[2048]");
1217                         isMode1ISO = TRUE;
1218                 }
1219         }
1220         fseek(cdHandle, 0, SEEK_SET);
1221
1222         SysPrintf(".\n");
1223
1224         PrintTracks();
1225
1226         if (subChanMixed)
1227                 cdimg_read_func = cdread_sub_mixed;
1228         else if (isMode1ISO)
1229                 cdimg_read_func = cdread_2048;
1230
1231         // make sure we have another handle open for cdda
1232         if (numtracks > 1 && ti[1].handle == NULL) {
1233                 ti[1].handle = fopen(GetIsoFile(), "rb");
1234         }
1235         cdda_cur_sector = cdda_toc_delta = 0;
1236
1237         return 0;
1238 }
1239
1240 static long CALLBACK ISOclose(void) {
1241         int i;
1242
1243         if (cdHandle != NULL) {
1244                 fclose(cdHandle);
1245                 cdHandle = NULL;
1246         }
1247         if (subHandle != NULL) {
1248                 fclose(subHandle);
1249                 subHandle = NULL;
1250         }
1251         stopCDDA();
1252         cddaHandle = NULL;
1253
1254         if (compr_img != NULL) {
1255                 free(compr_img->index_table);
1256                 free(compr_img);
1257                 compr_img = NULL;
1258         }
1259
1260         for (i = 1; i <= numtracks; i++) {
1261                 if (ti[i].handle != NULL) {
1262                         fclose(ti[i].handle);
1263                         ti[i].handle = NULL;
1264                 }
1265         }
1266         numtracks = 0;
1267         UnloadSBI();
1268
1269         return 0;
1270 }
1271
1272 static long CALLBACK ISOinit(void) {
1273         assert(cdHandle == NULL);
1274         assert(subHandle == NULL);
1275
1276         return 0; // do nothing
1277 }
1278
1279 static long CALLBACK ISOshutdown(void) {
1280         ISOclose();
1281         return 0;
1282 }
1283
1284 // return Starting and Ending Track
1285 // buffer:
1286 //  byte 0 - start track
1287 //  byte 1 - end track
1288 static long CALLBACK ISOgetTN(unsigned char *buffer) {
1289         buffer[0] = 1;
1290
1291         if (numtracks > 0) {
1292                 buffer[1] = numtracks;
1293         }
1294         else {
1295                 buffer[1] = 1;
1296         }
1297
1298         return 0;
1299 }
1300
1301 // return Track Time
1302 // buffer:
1303 //  byte 0 - frame
1304 //  byte 1 - second
1305 //  byte 2 - minute
1306 static long CALLBACK ISOgetTD(unsigned char track, unsigned char *buffer) {
1307         if (track == 0) {
1308                 // CD length according pcsxr-svn (done a bit different here)
1309                 unsigned int sect;
1310                 unsigned char time[3];
1311                 sect = msf2sec(ti[numtracks].start) + msf2sec(ti[numtracks].length);
1312                 sec2msf(sect, (char *)time);
1313                 buffer[2] = time[0];
1314                 buffer[1] = time[1];
1315                 buffer[0] = time[2];
1316         }
1317         else if (numtracks > 0 && track <= numtracks) {
1318                 buffer[2] = ti[track].start[0];
1319                 buffer[1] = ti[track].start[1];
1320                 buffer[0] = ti[track].start[2];
1321         }
1322         else {
1323                 buffer[2] = 0;
1324                 buffer[1] = 2;
1325                 buffer[0] = 0;
1326         }
1327
1328         return 0;
1329 }
1330
1331 // decode 'raw' subchannel data ripped by cdrdao
1332 static void DecodeRawSubData(void) {
1333         unsigned char subQData[12];
1334         int i;
1335
1336         memset(subQData, 0, sizeof(subQData));
1337
1338         for (i = 0; i < 8 * 12; i++) {
1339                 if (subbuffer[i] & (1 << 6)) { // only subchannel Q is needed
1340                         subQData[i >> 3] |= (1 << (7 - (i & 7)));
1341                 }
1342         }
1343
1344         memcpy(&subbuffer[12], subQData, 12);
1345 }
1346
1347 // read track
1348 // time: byte 0 - minute; byte 1 - second; byte 2 - frame
1349 // uses bcd format
1350 static long CALLBACK ISOreadTrack(unsigned char *time) {
1351         int sector = MSF2SECT(btoi(time[0]), btoi(time[1]), btoi(time[2]));
1352
1353         if (cdHandle == NULL) {
1354                 return -1;
1355         }
1356
1357         if (pregapOffset) {
1358                 subChanMissing = FALSE;
1359                 if (sector >= pregapOffset) {
1360                         sector -= 2 * 75;
1361                         if (sector < pregapOffset)
1362                                 subChanMissing = TRUE;
1363                 }
1364         }
1365
1366         cdimg_read_func(cdHandle, cdbuffer, sector, 12);
1367
1368         if (subHandle != NULL) {
1369                 fseek(subHandle, sector * SUB_FRAMESIZE, SEEK_SET);
1370                 fread(subbuffer, 1, SUB_FRAMESIZE, subHandle);
1371
1372                 if (subChanRaw) DecodeRawSubData();
1373         }
1374
1375         return 0;
1376 }
1377
1378 // plays cdda audio
1379 // sector: byte 0 - minute; byte 1 - second; byte 2 - frame
1380 // does NOT uses bcd format
1381 static long CALLBACK ISOplay(unsigned char *time) {
1382         unsigned int i, abs_sect, start_sect = 0;
1383         int track_offset, file_sect;
1384
1385         if (numtracks <= 1)
1386                 return 0;
1387
1388         // find the track
1389         abs_sect = msf2sec((char *)time);
1390         for (i = numtracks; i > 1; i--) {
1391                 start_sect = msf2sec(ti[i].start);
1392                 if (start_sect <= abs_sect + 2 * 75)
1393                         break;
1394         }
1395
1396         track_offset = abs_sect - start_sect;
1397         file_sect = ti[i].start_offset + track_offset;
1398         if (file_sect < 0)
1399                 file_sect = 0;
1400
1401         // find the file that contains this track
1402         for (; i > 1; i--)
1403                 if (ti[i].handle != NULL)
1404                         break;
1405
1406         cdda_first_sector = 0;
1407         if (i == 1)
1408                 cdda_first_sector = file_sect - track_offset;
1409
1410         cdda_toc_delta = abs_sect - file_sect;
1411         cddaHandle = ti[i].handle;
1412
1413         if (SPU_playCDDAchannel != NULL) {
1414                 startCDDA(file_sect);
1415         }
1416         return 0;
1417 }
1418
1419 // stops cdda audio
1420 static long CALLBACK ISOstop(void) {
1421         stopCDDA();
1422         return 0;
1423 }
1424
1425 // gets subchannel data
1426 static unsigned char* CALLBACK ISOgetBufferSub(void) {
1427         if ((subHandle != NULL || subChanMixed) && !subChanMissing) {
1428                 return subbuffer;
1429         }
1430
1431         return NULL;
1432 }
1433
1434 static long CALLBACK ISOgetStatus(struct CdrStat *stat) {
1435         int sec;
1436
1437         CDR__getStatus(stat);
1438
1439         if (playing) {
1440                 stat->Type = 0x02;
1441                 stat->Status |= 0x80;
1442         }
1443         else {
1444                 stat->Type = 0x01;
1445         }
1446
1447         sec = cdda_cur_sector + cdda_toc_delta;
1448         sec2msf(sec, (char *)stat->Time);
1449
1450         return 0;
1451 }
1452
1453 void cdrIsoInit(void) {
1454         CDR_init = ISOinit;
1455         CDR_shutdown = ISOshutdown;
1456         CDR_open = ISOopen;
1457         CDR_close = ISOclose;
1458         CDR_getTN = ISOgetTN;
1459         CDR_getTD = ISOgetTD;
1460         CDR_readTrack = ISOreadTrack;
1461         CDR_getBuffer = ISOgetBuffer;
1462         CDR_play = ISOplay;
1463         CDR_stop = ISOstop;
1464         CDR_getBufferSub = ISOgetBufferSub;
1465         CDR_getStatus = ISOgetStatus;
1466
1467         CDR_getDriveLetter = CDR__getDriveLetter;
1468         CDR_configure = CDR__configure;
1469         CDR_test = CDR__test;
1470         CDR_about = CDR__about;
1471         CDR_setfilename = CDR__setfilename;
1472
1473         numtracks = 0;
1474 }
1475
1476 int cdrIsoActive(void) {
1477         return (cdHandle != NULL);
1478 }