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