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 #endif
  34 #include <zlib.h>
  35
  36 unsigned int cdrIsoMultidiskCount;
  37 unsigned int cdrIsoMultidiskSelect;
  38
  39 static FILE *cdHandle = NULL;
  40 static FILE *cddaHandle = NULL;
  41 static FILE *subHandle = NULL;
  42
  43 static boolean subChanMixed = FALSE;
  44 static boolean subChanRaw = FALSE;
  45 static boolean subChanMissing = FALSE;
  46
  47 static unsigned char cdbuffer[DATA_SIZE];
  48 static unsigned char subbuffer[SUB_FRAMESIZE];
  49
  50 static unsigned char sndbuffer[CD_FRAMESIZE_RAW * 10];
  51
  52 #define CDDA_FRAMETIME                  (1000 * (sizeof(sndbuffer) / CD_FRAMESIZE_RAW) / 75)
  53
  54 #ifdef _WIN32
  55 static HANDLE threadid;
  56 #else
  57 static pthread_t threadid;
  58 #endif
  59 static unsigned int initial_offset = 0;
  60 static boolean playing = FALSE;
  61 static boolean cddaBigEndian = FALSE;
  62 static unsigned int cdda_cur_sector;
  63 static unsigned int cdda_start_sector;
  64 /* Frame offset into CD image where pregap data would be found if it was there.
  65  * If a game seeks there we must *not* return subchannel data since it's
  66  * not in the CD image, so that cdrom code can fake subchannel data instead.
  67  * XXX: there could be multiple pregaps but PSX dumps only have one? */
  68 static unsigned int pregapOffset;
  69
  70 // compressed image stuff
  71 static struct {
  72         unsigned char buff_raw[16][CD_FRAMESIZE_RAW];
  73         unsigned char buff_compressed[CD_FRAMESIZE_RAW * 16 + 100];
  74         unsigned int *index_table;
  75         unsigned int index_len;
  76         unsigned int block_shift;
  77         unsigned int current_block;
  78         unsigned int sector_in_blk;
  79 } *compr_img;
  80
  81 int (*cdimg_read_func)(FILE *f, void *dest, int sector, int offset);
  82
  83 char* CALLBACK CDR__getDriveLetter(void);
  84 long CALLBACK CDR__configure(void);
  85 long CALLBACK CDR__test(void);
  86 void CALLBACK CDR__about(void);
  87 long CALLBACK CDR__setfilename(char *filename);
  88 long CALLBACK CDR__getStatus(struct CdrStat *stat);
  89
  90 static void DecodeRawSubData(void);
  91
  92 extern void *hCDRDriver;
  93
  94 struct trackinfo {
  95         enum {DATA, CDDA} type;
  96         char start[3];          // MSF-format
  97         char length[3];         // MSF-format
  98         FILE *handle;           // for multi-track images CDDA
  99         int start_offset;       // sector offset from start of above file
 100 };
 101
 102 #define MAXTRACKS 100 /* How many tracks can a CD hold? */
 103
 104 static int numtracks = 0;
 105 static struct trackinfo ti[MAXTRACKS];
 106
 107 // get a sector from a msf-array
 108 static unsigned int msf2sec(char *msf) {
 109         return ((msf[0] * 60 + msf[1]) * 75) + msf[2];
 110 }
 111
 112 static void sec2msf(unsigned int s, char *msf) {
 113         msf[0] = s / 75 / 60;
 114         s = s - msf[0] * 75 * 60;
 115         msf[1] = s / 75;
 116         s = s - msf[1] * 75;
 117         msf[2] = s;
 118 }
 119
 120 // divide a string of xx:yy:zz into m, s, f
 121 static void tok2msf(char *time, char *msf) {
 122         char *token;
 123
 124         token = strtok(time, ":");
 125         if (token) {
 126                 msf[0] = atoi(token);
 127         }
 128         else {
 129                 msf[0] = 0;
 130         }
 131
 132         token = strtok(NULL, ":");
 133         if (token) {
 134                 msf[1] = atoi(token);
 135         }
 136         else {
 137                 msf[1] = 0;
 138         }
 139
 140         token = strtok(NULL, ":");
 141         if (token) {
 142                 msf[2] = atoi(token);
 143         }
 144         else {
 145                 msf[2] = 0;
 146         }
 147 }
 148
 149 #ifndef _WIN32
 150 static long GetTickCount(void) {
 151         static time_t           initial_time = 0;
 152         struct timeval          now;
 153
 154         gettimeofday(&now, NULL);
 155
 156         if (initial_time == 0) {
 157                 initial_time = now.tv_sec;
 158         }
 159
 160         return (now.tv_sec - initial_time) * 1000L + now.tv_usec / 1000L;
 161 }
 162 #endif
 163
 164 // this thread plays audio data
 165 #ifdef _WIN32
 166 static void playthread(void *param)
 167 #else
 168 static void *playthread(void *param)
 169 #endif
 170 {
 171         long osleep, d, t, i, s;
 172         unsigned char   tmp;
 173         int ret = 0;
 174
 175         t = GetTickCount();
 176
 177         while (playing) {
 178                 s = 0;
 179                 for (i = 0; i < sizeof(sndbuffer) / CD_FRAMESIZE_RAW; i++) {
 180                         d = cdimg_read_func(cddaHandle, sndbuffer + s, cdda_cur_sector, 0);
 181                         if (d < CD_FRAMESIZE_RAW)
 182                                 break;
 183
 184                         s += d;
 185                         cdda_cur_sector++;
 186                 }
 187
 188                 if (subHandle != NULL) {
 189                         fseek(subHandle, cdda_cur_sector * SUB_FRAMESIZE, SEEK_SET);
 190                         fread(subbuffer, 1, SUB_FRAMESIZE, subHandle);
 191
 192                         if (subChanRaw) DecodeRawSubData();
 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                         sscanf(linebuf, " FILE \"%[^\"]\"", tmpb);
 503
 504                         // absolute path?
 505                         ti[numtracks + 1].handle = fopen(tmpb, "rb");
 506                         if (ti[numtracks + 1].handle == NULL) {
 507                                 // relative to .cue?
 508                                 tmp = strrchr(tmpb, '\\');
 509                                 if (tmp == NULL)
 510                                         tmp = strrchr(tmpb, '/');
 511                                 if (tmp != NULL)
 512                                         tmp++;
 513                                 else
 514                                         tmp = tmpb;
 515                                 strncpy(incue_fname, tmp, incue_max_len);
 516                                 ti[numtracks + 1].handle = fopen(filepath, "rb");
 517                         }
 518
 519                         // update global offset if this is not first file in this .cue
 520                         if (numtracks + 1 > 1)
 521                                 sector_offs += file_len;
 522
 523                         file_len = 0;
 524                         if (ti[numtracks + 1].handle == NULL) {
 525                                 SysPrintf(_("\ncould not open: %s\n"), filepath);
 526                                 continue;
 527                         }
 528                         fseek(ti[numtracks + 1].handle, 0, SEEK_END);
 529                         file_len = ftell(ti[numtracks + 1].handle) / 2352;
 530
 531                         if (numtracks == 0 && strlen(isofile) >= 4 &&
 532                                 strcmp(isofile + strlen(isofile) - 4, ".cue") == 0)
 533                         {
 534                                 // user selected .cue as image file, use it's data track instead
 535                                 fclose(cdHandle);
 536                                 cdHandle = fopen(filepath, "rb");
 537                         }
 538                 }
 539         }
 540
 541         fclose(fi);
 542
 543         return 0;
 544 }
 545
 546 // this function tries to get the .ccd file of the given .img
 547 // the necessary data is put into the ti (trackinformation)-array
 548 static int parseccd(const char *isofile) {
 549         char                    ccdname[MAXPATHLEN];
 550         FILE                    *fi;
 551         char                    linebuf[256];
 552         unsigned int    t;
 553
 554         numtracks = 0;
 555
 556         // copy name of the iso and change extension from .img to .ccd
 557         strncpy(ccdname, isofile, sizeof(ccdname));
 558         ccdname[MAXPATHLEN - 1] = '\0';
 559         if (strlen(ccdname) >= 4) {
 560                 strcpy(ccdname + strlen(ccdname) - 4, ".ccd");
 561         }
 562         else {
 563                 return -1;
 564         }
 565
 566         if ((fi = fopen(ccdname, "r")) == NULL) {
 567                 return -1;
 568         }
 569
 570         memset(&ti, 0, sizeof(ti));
 571
 572         while (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 573                 if (!strncmp(linebuf, "[TRACK", 6)){
 574                         numtracks++;
 575                 }
 576                 else if (!strncmp(linebuf, "MODE=", 5)) {
 577                         sscanf(linebuf, "MODE=%d", &t);
 578                         ti[numtracks].type = ((t == 0) ? CDDA : DATA);
 579                 }
 580                 else if (!strncmp(linebuf, "INDEX 1=", 8)) {
 581                         sscanf(linebuf, "INDEX 1=%d", &t);
 582                         sec2msf(t + 2 * 75, ti[numtracks].start);
 583                         ti[numtracks].start_offset = t;
 584
 585                         // If we've already seen another track, this is its end
 586                         if (numtracks > 1) {
 587                                 t = msf2sec(ti[numtracks].start) - msf2sec(ti[numtracks - 1].start);
 588                                 sec2msf(t, ti[numtracks - 1].length);
 589                         }
 590                 }
 591         }
 592
 593         fclose(fi);
 594
 595         // Fill out the last track's end based on size
 596         if (numtracks >= 1) {
 597                 fseek(cdHandle, 0, SEEK_END);
 598                 t = ftell(cdHandle) / 2352 - msf2sec(ti[numtracks].start) + 2 * 75;
 599                 sec2msf(t, ti[numtracks].length);
 600         }
 601
 602         return 0;
 603 }
 604
 605 // this function tries to get the .mds file of the given .mdf
 606 // the necessary data is put into the ti (trackinformation)-array
 607 static int parsemds(const char *isofile) {
 608         char                    mdsname[MAXPATHLEN];
 609         FILE                    *fi;
 610         unsigned int    offset, extra_offset, l, i;
 611         unsigned short  s;
 612
 613         numtracks = 0;
 614
 615         // copy name of the iso and change extension from .mdf to .mds
 616         strncpy(mdsname, isofile, sizeof(mdsname));
 617         mdsname[MAXPATHLEN - 1] = '\0';
 618         if (strlen(mdsname) >= 4) {
 619                 strcpy(mdsname + strlen(mdsname) - 4, ".mds");
 620         }
 621         else {
 622                 return -1;
 623         }
 624
 625         if ((fi = fopen(mdsname, "rb")) == NULL) {
 626                 return -1;
 627         }
 628
 629         memset(&ti, 0, sizeof(ti));
 630
 631         // check if it's a valid mds file
 632         fread(&i, 1, sizeof(unsigned int), fi);
 633         i = SWAP32(i);
 634         if (i != 0x4944454D) {
 635                 // not an valid mds file
 636                 fclose(fi);
 637                 return -1;
 638         }
 639
 640         // get offset to session block
 641         fseek(fi, 0x50, SEEK_SET);
 642         fread(&offset, 1, sizeof(unsigned int), fi);
 643         offset = SWAP32(offset);
 644
 645         // get total number of tracks
 646         offset += 14;
 647         fseek(fi, offset, SEEK_SET);
 648         fread(&s, 1, sizeof(unsigned short), fi);
 649         s = SWAP16(s);
 650         numtracks = s;
 651
 652         // get offset to track blocks
 653         fseek(fi, 4, SEEK_CUR);
 654         fread(&offset, 1, sizeof(unsigned int), fi);
 655         offset = SWAP32(offset);
 656
 657         // skip lead-in data
 658         while (1) {
 659                 fseek(fi, offset + 4, SEEK_SET);
 660                 if (fgetc(fi) < 0xA0) {
 661                         break;
 662                 }
 663                 offset += 0x50;
 664         }
 665
 666         // check if the image contains mixed subchannel data
 667         fseek(fi, offset + 1, SEEK_SET);
 668         subChanMixed = (fgetc(fi) ? TRUE : FALSE);
 669
 670         // read track data
 671         for (i = 1; i <= numtracks; i++) {
 672                 fseek(fi, offset, SEEK_SET);
 673
 674                 // get the track type
 675                 ti[i].type = ((fgetc(fi) == 0xA9) ? CDDA : DATA);
 676                 fseek(fi, 8, SEEK_CUR);
 677
 678                 // get the track starting point
 679                 ti[i].start[0] = fgetc(fi);
 680                 ti[i].start[1] = fgetc(fi);
 681                 ti[i].start[2] = fgetc(fi);
 682
 683                 fread(&extra_offset, 1, sizeof(unsigned int), fi);
 684                 extra_offset = SWAP32(extra_offset);
 685
 686                 // get track start offset (in .mdf)
 687                 fseek(fi, offset + 0x28, SEEK_SET);
 688                 fread(&l, 1, sizeof(unsigned int), fi);
 689                 l = SWAP32(l);
 690                 ti[i].start_offset = l / CD_FRAMESIZE_RAW;
 691
 692                 // get pregap
 693                 fseek(fi, extra_offset, SEEK_SET);
 694                 fread(&l, 1, sizeof(unsigned int), fi);
 695                 l = SWAP32(l);
 696                 if (l != 0 && i > 1)
 697                         pregapOffset = ti[i].start_offset;
 698
 699                 // get the track length
 700                 fread(&l, 1, sizeof(unsigned int), fi);
 701                 l = SWAP32(l);
 702                 sec2msf(l, ti[i].length);
 703
 704                 offset += 0x50;
 705         }
 706
 707         fclose(fi);
 708         return 0;
 709 }
 710
 711 static int handlepbp(const char *isofile) {
 712         struct {
 713                 unsigned int sig;
 714                 unsigned int dontcare[8];
 715                 unsigned int psar_offs;
 716         } pbp_hdr;
 717         struct {
 718                 unsigned char type;
 719                 unsigned char pad0;
 720                 unsigned char track;
 721                 char index0[3];
 722                 char pad1;
 723                 char index1[3];
 724         } toc_entry;
 725         struct {
 726                 unsigned int offset;
 727                 unsigned int size;
 728                 unsigned int dontcare[6];
 729         } index_entry;
 730         char psar_sig[11];
 731         unsigned int t, cd_length, cdimg_base;
 732         unsigned int offsettab[8], psisoimg_offs;
 733         const char *ext = NULL;
 734         int i, ret;
 735
 736         if (strlen(isofile) >= 4)
 737                 ext = isofile + strlen(isofile) - 4;
 738         if (ext == NULL || (strcmp(ext, ".pbp") != 0 && strcmp(ext, ".PBP") != 0))
 739                 return -1;
 740
 741         numtracks = 0;
 742
 743         ret = fread(&pbp_hdr, 1, sizeof(pbp_hdr), cdHandle);
 744         if (ret != sizeof(pbp_hdr)) {
 745                 fprintf(stderr, "failed to read pbp\n");
 746                 goto fail_io;
 747         }
 748
 749         ret = fseek(cdHandle, pbp_hdr.psar_offs, SEEK_SET);
 750         if (ret != 0) {
 751                 fprintf(stderr, "failed to seek to %x\n", pbp_hdr.psar_offs);
 752                 goto fail_io;
 753         }
 754
 755         psisoimg_offs = pbp_hdr.psar_offs;
 756         fread(psar_sig, 1, sizeof(psar_sig), cdHandle);
 757         psar_sig[10] = 0;
 758         if (strcmp(psar_sig, "PSTITLEIMG") == 0) {
 759                 // multidisk image?
 760                 ret = fseek(cdHandle, pbp_hdr.psar_offs + 0x200, SEEK_SET);
 761                 if (ret != 0) {
 762                         fprintf(stderr, "failed to seek to %x\n", pbp_hdr.psar_offs + 0x200);
 763                         goto fail_io;
 764                 }
 765
 766                 if (fread(&offsettab, 1, sizeof(offsettab), cdHandle) != sizeof(offsettab)) {
 767                         fprintf(stderr, "failed to read offsettab\n");
 768                         goto fail_io;
 769                 }
 770
 771                 for (i = 0; i < sizeof(offsettab) / sizeof(offsettab[0]); i++) {
 772                         if (offsettab[i] == 0)
 773                                 break;
 774                 }
 775                 cdrIsoMultidiskCount = i;
 776                 if (cdrIsoMultidiskCount == 0) {
 777                         fprintf(stderr, "multidisk eboot has 0 images?\n");
 778                         goto fail_io;
 779                 }
 780
 781                 if (cdrIsoMultidiskSelect >= cdrIsoMultidiskCount)
 782                         cdrIsoMultidiskSelect = 0;
 783
 784                 psisoimg_offs += offsettab[cdrIsoMultidiskSelect];
 785
 786                 ret = fseek(cdHandle, psisoimg_offs, SEEK_SET);
 787                 if (ret != 0) {
 788                         fprintf(stderr, "failed to seek to %x\n", psisoimg_offs);
 789                         goto fail_io;
 790                 }
 791
 792                 fread(psar_sig, 1, sizeof(psar_sig), cdHandle);
 793                 psar_sig[10] = 0;
 794         }
 795
 796         if (strcmp(psar_sig, "PSISOIMG00") != 0) {
 797                 fprintf(stderr, "bad psar_sig: %s\n", psar_sig);
 798                 goto fail_io;
 799         }
 800
 801         // seek to TOC
 802         ret = fseek(cdHandle, psisoimg_offs + 0x800, SEEK_SET);
 803         if (ret != 0) {
 804                 fprintf(stderr, "failed to seek to %x\n", psisoimg_offs + 0x800);
 805                 goto fail_io;
 806         }
 807
 808         // first 3 entries are special
 809         fseek(cdHandle, sizeof(toc_entry), SEEK_CUR);
 810         fread(&toc_entry, 1, sizeof(toc_entry), cdHandle);
 811         numtracks = btoi(toc_entry.index1[0]);
 812
 813         fread(&toc_entry, 1, sizeof(toc_entry), cdHandle);
 814         cd_length = btoi(toc_entry.index1[0]) * 60 * 75 +
 815                 btoi(toc_entry.index1[1]) * 75 + btoi(toc_entry.index1[2]);
 816
 817         for (i = 1; i <= numtracks; i++) {
 818                 fread(&toc_entry, 1, sizeof(toc_entry), cdHandle);
 819
 820                 ti[i].type = (toc_entry.type == 1) ? CDDA : DATA;
 821
 822                 ti[i].start_offset = btoi(toc_entry.index0[0]) * 60 * 75 +
 823                         btoi(toc_entry.index0[1]) * 75 + btoi(toc_entry.index0[2]);
 824                 ti[i].start[0] = btoi(toc_entry.index1[0]);
 825                 ti[i].start[1] = btoi(toc_entry.index1[1]);
 826                 ti[i].start[2] = btoi(toc_entry.index1[2]);
 827
 828                 if (i > 1) {
 829                         t = msf2sec(ti[i].start) - msf2sec(ti[i - 1].start);
 830                         sec2msf(t, ti[i - 1].length);
 831                 }
 832         }
 833         t = cd_length - ti[numtracks].start_offset;
 834         sec2msf(t, ti[numtracks].length);
 835
 836         // seek to ISO index
 837         ret = fseek(cdHandle, psisoimg_offs + 0x4000, SEEK_SET);
 838         if (ret != 0) {
 839                 fprintf(stderr, "failed to seek to ISO index\n");
 840                 goto fail_io;
 841         }
 842
 843         compr_img = calloc(1, sizeof(*compr_img));
 844         if (compr_img == NULL)
 845                 goto fail_io;
 846
 847         compr_img->block_shift = 4;
 848         compr_img->current_block = (unsigned int)-1;
 849
 850         compr_img->index_len = (0x100000 - 0x4000) / sizeof(index_entry);
 851         compr_img->index_table = malloc((compr_img->index_len + 1) * sizeof(compr_img->index_table[0]));
 852         if (compr_img->index_table == NULL)
 853                 goto fail_io;
 854
 855         cdimg_base = psisoimg_offs + 0x100000;
 856         for (i = 0; i < compr_img->index_len; i++) {
 857                 ret = fread(&index_entry, 1, sizeof(index_entry), cdHandle);
 858                 if (ret != sizeof(index_entry)) {
 859                         fprintf(stderr, "failed to read index_entry #%d\n", i);
 860                         goto fail_index;
 861                 }
 862
 863                 if (index_entry.size == 0)
 864                         break;
 865
 866                 compr_img->index_table[i] = cdimg_base + index_entry.offset;
 867         }
 868         compr_img->index_table[i] = cdimg_base + index_entry.offset + index_entry.size;
 869
 870         return 0;
 871
 872 fail_index:
 873         free(compr_img->index_table);
 874         compr_img->index_table = NULL;
 875 fail_io:
 876         if (compr_img != NULL) {
 877                 free(compr_img);
 878                 compr_img = NULL;
 879         }
 880         return -1;
 881 }
 882
 883 static int handlecbin(const char *isofile) {
 884         struct
 885         {
 886                 char magic[4];
 887                 unsigned int header_size;
 888                 unsigned long long total_bytes;
 889                 unsigned int block_size;
 890                 unsigned char ver;              // 1
 891                 unsigned char align;
 892                 unsigned char rsv_06[2];
 893         } ciso_hdr;
 894         const char *ext = NULL;
 895         unsigned int index = 0, plain;
 896         int i, ret;
 897
 898         if (strlen(isofile) >= 5)
 899                 ext = isofile + strlen(isofile) - 5;
 900         if (ext == NULL || (strcasecmp(ext + 1, ".cbn") != 0 && strcasecmp(ext, ".cbin") != 0))
 901                 return -1;
 902
 903         ret = fread(&ciso_hdr, 1, sizeof(ciso_hdr), cdHandle);
 904         if (ret != sizeof(ciso_hdr)) {
 905                 fprintf(stderr, "failed to read ciso header\n");
 906                 return -1;
 907         }
 908
 909         if (strncmp(ciso_hdr.magic, "CISO", 4) != 0 || ciso_hdr.total_bytes <= 0 || ciso_hdr.block_size <= 0) {
 910                 fprintf(stderr, "bad ciso header\n");
 911                 return -1;
 912         }
 913         if (ciso_hdr.header_size != 0 && ciso_hdr.header_size != sizeof(ciso_hdr)) {
 914                 ret = fseek(cdHandle, ciso_hdr.header_size, SEEK_SET);
 915                 if (ret != 0) {
 916                         fprintf(stderr, "failed to seek to %x\n", ciso_hdr.header_size);
 917                         return -1;
 918                 }
 919         }
 920
 921         compr_img = calloc(1, sizeof(*compr_img));
 922         if (compr_img == NULL)
 923                 goto fail_io;
 924
 925         compr_img->block_shift = 0;
 926         compr_img->current_block = (unsigned int)-1;
 927
 928         compr_img->index_len = ciso_hdr.total_bytes / ciso_hdr.block_size;
 929         compr_img->index_table = malloc((compr_img->index_len + 1) * sizeof(compr_img->index_table[0]));
 930         if (compr_img->index_table == NULL)
 931                 goto fail_io;
 932
 933         ret = fread(compr_img->index_table, sizeof(compr_img->index_table[0]), compr_img->index_len, cdHandle);
 934         if (ret != compr_img->index_len) {
 935                 fprintf(stderr, "failed to read index table\n");
 936                 goto fail_index;
 937         }
 938
 939         for (i = 0; i < compr_img->index_len + 1; i++) {
 940                 index = compr_img->index_table[i];
 941                 plain = index & 0x80000000;
 942                 index &= 0x7fffffff;
 943                 compr_img->index_table[i] = (index << ciso_hdr.align) | plain;
 944         }
 945         if ((long long)index << ciso_hdr.align >= 0x80000000ll)
 946                 fprintf(stderr, "warning: ciso img too large, expect problems\n");
 947
 948         return 0;
 949
 950 fail_index:
 951         free(compr_img->index_table);
 952         compr_img->index_table = NULL;
 953 fail_io:
 954         if (compr_img != NULL) {
 955                 free(compr_img);
 956                 compr_img = NULL;
 957         }
 958         return -1;
 959 }
 960
 961 // this function tries to get the .sub file of the given .img
 962 static int opensubfile(const char *isoname) {
 963         char            subname[MAXPATHLEN];
 964
 965         // copy name of the iso and change extension from .img to .sub
 966         strncpy(subname, isoname, sizeof(subname));
 967         subname[MAXPATHLEN - 1] = '\0';
 968         if (strlen(subname) >= 4) {
 969                 strcpy(subname + strlen(subname) - 4, ".sub");
 970         }
 971         else {
 972                 return -1;
 973         }
 974
 975         subHandle = fopen(subname, "rb");
 976         if (subHandle == NULL) {
 977                 return -1;
 978         }
 979
 980         return 0;
 981 }
 982
 983 static int opensbifile(const char *isoname) {
 984         char            sbiname[MAXPATHLEN];
 985         int             s;
 986
 987         strncpy(sbiname, isoname, sizeof(sbiname));
 988         sbiname[MAXPATHLEN - 1] = '\0';
 989         if (strlen(sbiname) >= 4) {
 990                 strcpy(sbiname + strlen(sbiname) - 4, ".sbi");
 991         }
 992         else {
 993                 return -1;
 994         }
 995
 996         fseek(cdHandle, 0, SEEK_END);
 997         s = ftell(cdHandle) / 2352;
 998
 999         return LoadSBI(sbiname, s);
1000 }
1001
1002 static int cdread_normal(FILE *f, void *dest, int sector, int offset)
1003 {
1004         fseek(f, sector * CD_FRAMESIZE_RAW + offset, SEEK_SET);
1005         return fread(dest, 1, CD_FRAMESIZE_RAW - offset, f);
1006 }
1007
1008 static int cdread_sub_mixed(FILE *f, void *dest, int sector, int offset)
1009 {
1010         int ret;
1011
1012         fseek(f, sector * (CD_FRAMESIZE_RAW + SUB_FRAMESIZE) + offset, SEEK_SET);
1013         ret = fread(dest, 1, CD_FRAMESIZE_RAW - offset, f);
1014         fread(subbuffer, 1, SUB_FRAMESIZE, f);
1015
1016         if (subChanRaw) DecodeRawSubData();
1017
1018         return ret;
1019 }
1020
1021 static int uncompress2(void *out, unsigned long *out_size, void *in, unsigned long in_size)
1022 {
1023         static z_stream z;
1024         int ret = 0;
1025
1026         if (z.zalloc == NULL) {
1027                 // XXX: one-time leak here..
1028                 z.next_in = Z_NULL;
1029                 z.avail_in = 0;
1030                 z.zalloc = Z_NULL;
1031                 z.zfree = Z_NULL;
1032                 z.opaque = Z_NULL;
1033                 ret = inflateInit2(&z, -15);
1034         }
1035         else
1036                 ret = inflateReset(&z);
1037         if (ret != Z_OK)
1038                 return ret;
1039
1040         z.next_in = in;
1041         z.avail_in = in_size;
1042         z.next_out = out;
1043         z.avail_out = *out_size;
1044
1045         ret = inflate(&z, Z_NO_FLUSH);
1046         //inflateEnd(&z);
1047
1048         *out_size -= z.avail_out;
1049         return ret == 1 ? 0 : ret;
1050 }
1051
1052 static int cdread_compressed(FILE *f, void *dest, int sector, int offset)
1053 {
1054         unsigned long cdbuffer_size, cdbuffer_size_expect;
1055         unsigned int start_byte, size;
1056         int is_compressed;
1057         int ret, block;
1058
1059         block = sector >> compr_img->block_shift;
1060         compr_img->sector_in_blk = sector & ((1 << compr_img->block_shift) - 1);
1061
1062         if (block == compr_img->current_block) {
1063                 //printf("hit sect %d\n", sector);
1064                 goto finish;
1065         }
1066
1067         if (sector >= compr_img->index_len * 16) {
1068                 fprintf(stderr, "sector %d is past img end\n", sector);
1069                 return -1;
1070         }
1071
1072         start_byte = compr_img->index_table[block] & 0x7fffffff;
1073         if (fseek(cdHandle, start_byte, SEEK_SET) != 0) {
1074                 fprintf(stderr, "seek error for block %d at %x: ",
1075                         block, start_byte);
1076                 perror(NULL);
1077                 return -1;
1078         }
1079
1080         is_compressed = !(compr_img->index_table[block] & 0x80000000);
1081         size = (compr_img->index_table[block + 1] & 0x7fffffff) - start_byte;
1082         if (size > sizeof(compr_img->buff_compressed)) {
1083                 fprintf(stderr, "block %d is too large: %u\n", block, size);
1084                 return -1;
1085         }
1086
1087         if (fread(is_compressed ? compr_img->buff_compressed : compr_img->buff_raw[0],
1088                                 1, size, cdHandle) != size) {
1089                 fprintf(stderr, "read error for block %d at %x: ", block, start_byte);
1090                 perror(NULL);
1091                 return -1;
1092         }
1093
1094         if (is_compressed) {
1095                 cdbuffer_size_expect = sizeof(compr_img->buff_raw[0]) << compr_img->block_shift;
1096                 cdbuffer_size = cdbuffer_size_expect;
1097                 ret = uncompress2(compr_img->buff_raw[0], &cdbuffer_size, compr_img->buff_compressed, size);
1098                 if (ret != 0) {
1099                         fprintf(stderr, "uncompress failed with %d for block %d, sector %d\n",
1100                                         ret, block, sector);
1101                         return -1;
1102                 }
1103                 if (cdbuffer_size != cdbuffer_size_expect)
1104                         fprintf(stderr, "cdbuffer_size: %lu != %lu, sector %d\n", cdbuffer_size,
1105                                         cdbuffer_size_expect, sector);
1106         }
1107
1108         // done at last!
1109         compr_img->current_block = block;
1110
1111 finish:
1112         if (dest != cdbuffer) // copy avoid HACK
1113                 memcpy(dest, compr_img->buff_raw[compr_img->sector_in_blk] + offset,
1114                         CD_FRAMESIZE_RAW - offset);
1115         return CD_FRAMESIZE_RAW - offset;
1116 }
1117
1118 static int cdread_2048(FILE *f, void *dest, int sector, int offset)
1119 {
1120         int ret;
1121
1122         fseek(f, sector * 2048, SEEK_SET);
1123         ret = fread((char *)dest + 12, 1, 2048, f);
1124
1125         // not really necessary, fake mode 2 header
1126         memset(cdbuffer, 0, 12);
1127         sec2msf(sector + 2 * 75, (char *)cdbuffer);
1128         cdbuffer[3] = 1;
1129
1130         return ret;
1131 }
1132
1133 static unsigned char * CALLBACK ISOgetBuffer_compr(void) {
1134         return compr_img->buff_raw[compr_img->sector_in_blk] + 12;
1135 }
1136
1137 static unsigned char * CALLBACK ISOgetBuffer(void) {
1138         return cdbuffer;
1139 }
1140
1141 static void PrintTracks(void) {
1142         int i;
1143
1144         for (i = 1; i <= numtracks; i++) {
1145                 SysPrintf(_("Track %.2d (%s) - Start %.2d:%.2d:%.2d, Length %.2d:%.2d:%.2d\n"),
1146                         i, (ti[i].type == DATA ? "DATA" : "AUDIO"),
1147                         ti[i].start[0], ti[i].start[1], ti[i].start[2],
1148                         ti[i].length[0], ti[i].length[1], ti[i].length[2]);
1149         }
1150 }
1151
1152 // This function is invoked by the front-end when opening an ISO
1153 // file for playback
1154 static long CALLBACK ISOopen(void) {
1155         boolean isMode1ISO = FALSE;
1156
1157         if (cdHandle != NULL) {
1158                 return 0; // it's already open
1159         }
1160
1161         cdHandle = fopen(GetIsoFile(), "rb");
1162         if (cdHandle == NULL) {
1163                 return -1;
1164         }
1165
1166         SysPrintf(_("Loaded CD Image: %s"), GetIsoFile());
1167
1168         cddaBigEndian = FALSE;
1169         subChanMixed = FALSE;
1170         subChanRaw = FALSE;
1171         pregapOffset = 0;
1172         cdrIsoMultidiskCount = 1;
1173
1174         CDR_getBuffer = ISOgetBuffer;
1175         cdimg_read_func = cdread_normal;
1176
1177         if (parsecue(GetIsoFile()) == 0) {
1178                 SysPrintf("[+cue]");
1179         }
1180         else if (parsetoc(GetIsoFile()) == 0) {
1181                 SysPrintf("[+toc]");
1182         }
1183         else if (parseccd(GetIsoFile()) == 0) {
1184                 SysPrintf("[+ccd]");
1185         }
1186         else if (parsemds(GetIsoFile()) == 0) {
1187                 SysPrintf("[+mds]");
1188         }
1189         if (handlepbp(GetIsoFile()) == 0) {
1190                 SysPrintf("[pbp]");
1191                 CDR_getBuffer = ISOgetBuffer_compr;
1192                 cdimg_read_func = cdread_compressed;
1193         }
1194         else if (handlecbin(GetIsoFile()) == 0) {
1195                 SysPrintf("[cbin]");
1196                 CDR_getBuffer = ISOgetBuffer_compr;
1197                 cdimg_read_func = cdread_compressed;
1198         }
1199
1200         if (!subChanMixed && opensubfile(GetIsoFile()) == 0) {
1201                 SysPrintf("[+sub]");
1202         }
1203         if (opensbifile(GetIsoFile()) == 0) {
1204                 SysPrintf("[+sbi]");
1205         }
1206
1207         // guess whether it is mode1/2048
1208         fseek(cdHandle, 0, SEEK_END);
1209         if (ftell(cdHandle) % 2048 == 0) {
1210                 unsigned int modeTest = 0;
1211                 fseek(cdHandle, 0, SEEK_SET);
1212                 fread(&modeTest, 4, 1, cdHandle);
1213                 if (SWAP32(modeTest) != 0xffffff00) {
1214                         SysPrintf("[2048]");
1215                         isMode1ISO = TRUE;
1216                 }
1217         }
1218         fseek(cdHandle, 0, SEEK_SET);
1219
1220         SysPrintf(".\n");
1221
1222         PrintTracks();
1223
1224         if (subChanMixed)
1225                 cdimg_read_func = cdread_sub_mixed;
1226         else if (isMode1ISO)
1227                 cdimg_read_func = cdread_2048;
1228
1229         // make sure we have another handle open for cdda
1230         if (numtracks > 1 && ti[1].handle == NULL) {
1231                 ti[1].handle = fopen(GetIsoFile(), "rb");
1232         }
1233         cdda_cur_sector = cdda_start_sector = 0;
1234
1235         return 0;
1236 }
1237
1238 static long CALLBACK ISOclose(void) {
1239         int i;
1240
1241         if (cdHandle != NULL) {
1242                 fclose(cdHandle);
1243                 cdHandle = NULL;
1244         }
1245         if (subHandle != NULL) {
1246                 fclose(subHandle);
1247                 subHandle = NULL;
1248         }
1249         stopCDDA();
1250         cddaHandle = NULL;
1251
1252         if (compr_img != NULL) {
1253                 free(compr_img->index_table);
1254                 free(compr_img);
1255                 compr_img = NULL;
1256         }
1257
1258         for (i = 1; i <= numtracks; i++) {
1259                 if (ti[i].handle != NULL) {
1260                         fclose(ti[i].handle);
1261                         ti[i].handle = NULL;
1262                 }
1263         }
1264         numtracks = 0;
1265         UnloadSBI();
1266
1267         return 0;
1268 }
1269
1270 static long CALLBACK ISOinit(void) {
1271         assert(cdHandle == NULL);
1272         assert(subHandle == NULL);
1273
1274         return 0; // do nothing
1275 }
1276
1277 static long CALLBACK ISOshutdown(void) {
1278         ISOclose();
1279         return 0;
1280 }
1281
1282 // return Starting and Ending Track
1283 // buffer:
1284 //  byte 0 - start track
1285 //  byte 1 - end track
1286 static long CALLBACK ISOgetTN(unsigned char *buffer) {
1287         buffer[0] = 1;
1288
1289         if (numtracks > 0) {
1290                 buffer[1] = numtracks;
1291         }
1292         else {
1293                 buffer[1] = 1;
1294         }
1295
1296         return 0;
1297 }
1298
1299 // return Track Time
1300 // buffer:
1301 //  byte 0 - frame
1302 //  byte 1 - second
1303 //  byte 2 - minute
1304 static long CALLBACK ISOgetTD(unsigned char track, unsigned char *buffer) {
1305         if (track == 0) {
1306                 // CD length according pcsxr-svn (done a bit different here)
1307                 unsigned int sect;
1308                 unsigned char time[3];
1309                 sect = msf2sec(ti[numtracks].start) + msf2sec(ti[numtracks].length);
1310                 sec2msf(sect, (char *)time);
1311                 buffer[2] = time[0];
1312                 buffer[1] = time[1];
1313                 buffer[0] = time[2];
1314         }
1315         else if (numtracks > 0 && track <= numtracks) {
1316                 buffer[2] = ti[track].start[0];
1317                 buffer[1] = ti[track].start[1];
1318                 buffer[0] = ti[track].start[2];
1319         }
1320         else {
1321                 buffer[2] = 0;
1322                 buffer[1] = 2;
1323                 buffer[0] = 0;
1324         }
1325
1326         return 0;
1327 }
1328
1329 // decode 'raw' subchannel data ripped by cdrdao
1330 static void DecodeRawSubData(void) {
1331         unsigned char subQData[12];
1332         int i;
1333
1334         memset(subQData, 0, sizeof(subQData));
1335
1336         for (i = 0; i < 8 * 12; i++) {
1337                 if (subbuffer[i] & (1 << 6)) { // only subchannel Q is needed
1338                         subQData[i >> 3] |= (1 << (7 - (i & 7)));
1339                 }
1340         }
1341
1342         memcpy(&subbuffer[12], subQData, 12);
1343 }
1344
1345 // read track
1346 // time: byte 0 - minute; byte 1 - second; byte 2 - frame
1347 // uses bcd format
1348 static long CALLBACK ISOreadTrack(unsigned char *time) {
1349         int sector = MSF2SECT(btoi(time[0]), btoi(time[1]), btoi(time[2]));
1350
1351         if (cdHandle == NULL) {
1352                 return -1;
1353         }
1354
1355         if (pregapOffset) {
1356                 subChanMissing = FALSE;
1357                 if (sector >= pregapOffset) {
1358                         sector -= 2 * 75;
1359                         if (sector < pregapOffset)
1360                                 subChanMissing = TRUE;
1361                 }
1362         }
1363
1364         cdimg_read_func(cdHandle, cdbuffer, sector, 12);
1365
1366         if (subHandle != NULL) {
1367                 fseek(subHandle, sector * SUB_FRAMESIZE, SEEK_SET);
1368                 fread(subbuffer, 1, SUB_FRAMESIZE, subHandle);
1369
1370                 if (subChanRaw) DecodeRawSubData();
1371         }
1372
1373         return 0;
1374 }
1375
1376 // plays cdda audio
1377 // sector: byte 0 - minute; byte 1 - second; byte 2 - frame
1378 // does NOT uses bcd format
1379 static long CALLBACK ISOplay(unsigned char *time) {
1380         unsigned int i, abs_sect;
1381         int file_sect;
1382
1383         if (numtracks <= 1)
1384                 return 0;
1385
1386         // find the track
1387         abs_sect = msf2sec((char *)time);
1388         for (i = numtracks; i > 1; i--)
1389                 if (msf2sec(ti[i].start) <= abs_sect + 2 * 75)
1390                         break;
1391
1392         file_sect = ti[i].start_offset + (abs_sect - msf2sec(ti[i].start));
1393         if (file_sect < 0)
1394                 file_sect = 0;
1395
1396         // find the file that contains this track
1397         for (; i > 1; i--)
1398                 if (ti[i].handle != NULL)
1399                         break;
1400
1401         cdda_start_sector = abs_sect - file_sect;
1402         cddaHandle = ti[i].handle;
1403
1404         if (pregapOffset && (unsigned int)(pregapOffset - file_sect) < 2 * 75) {
1405                 // get out of the missing pregap to avoid noise
1406                 file_sect = pregapOffset;
1407         }
1408
1409         if (SPU_playCDDAchannel != NULL) {
1410                 startCDDA(file_sect);
1411         }
1412         return 0;
1413 }
1414
1415 // stops cdda audio
1416 static long CALLBACK ISOstop(void) {
1417         stopCDDA();
1418         return 0;
1419 }
1420
1421 // gets subchannel data
1422 static unsigned char* CALLBACK ISOgetBufferSub(void) {
1423         if ((subHandle != NULL || subChanMixed) && !subChanMissing) {
1424                 return subbuffer;
1425         }
1426
1427         return NULL;
1428 }
1429
1430 static long CALLBACK ISOgetStatus(struct CdrStat *stat) {
1431         int sec;
1432
1433         CDR__getStatus(stat);
1434
1435         if (playing) {
1436                 stat->Type = 0x02;
1437                 stat->Status |= 0x80;
1438         }
1439         else {
1440                 stat->Type = 0x01;
1441         }
1442
1443         sec = cdda_start_sector + cdda_cur_sector;
1444         sec2msf(sec, (char *)stat->Time);
1445
1446         return 0;
1447 }
1448
1449 void cdrIsoInit(void) {
1450         CDR_init = ISOinit;
1451         CDR_shutdown = ISOshutdown;
1452         CDR_open = ISOopen;
1453         CDR_close = ISOclose;
1454         CDR_getTN = ISOgetTN;
1455         CDR_getTD = ISOgetTD;
1456         CDR_readTrack = ISOreadTrack;
1457         CDR_getBuffer = ISOgetBuffer;
1458         CDR_play = ISOplay;
1459         CDR_stop = ISOstop;
1460         CDR_getBufferSub = ISOgetBufferSub;
1461         CDR_getStatus = ISOgetStatus;
1462
1463         CDR_getDriveLetter = CDR__getDriveLetter;
1464         CDR_configure = CDR__configure;
1465         CDR_test = CDR__test;
1466         CDR_about = CDR__about;
1467         CDR_setfilename = CDR__setfilename;
1468
1469         numtracks = 0;
1470 }
1471
1472 int cdrIsoActive(void) {
1473         return (cdHandle != NULL);
1474 }