libpcsxcore/cdriso.c

   1 /***************************************************************************
   2  *   Copyright (C) 2007 PCSX-df Team                                       *
   3  *   Copyright (C) 2009 Wei Mingzhi                                        *
   4  *   Copyright (C) 2012 notaz                                              *
   5  *                                                                         *
   6  *   This program is free software; you can redistribute it and/or modify  *
   7  *   it under the terms of the GNU General Public License as published by  *
   8  *   the Free Software Foundation; either version 2 of the License, or     *
   9  *   (at your option) any later version.                                   *
  10  *                                                                         *
  11  *   This program is distributed in the hope that it will be useful,       *
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  14  *   GNU General Public License for more details.                          *
  15  *                                                                         *
  16  *   You should have received a copy of the GNU General Public License     *
  17  *   along with this program; if not, write to the                         *
  18  *   Free Software Foundation, Inc.,                                       *
  19  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.           *
  20  ***************************************************************************/
  21
  22 #include "psxcommon.h"
  23 #include "plugins.h"
  24 #include "cdrom.h"
  25 #include "cdriso.h"
  26 #include "ppf.h"
  27
  28 #include <errno.h>
  29 #include <zlib.h>
  30 #ifdef HAVE_CHD
  31 #include <chd.h>
  32 #endif
  33
  34 #ifdef _WIN32
  35 #define WIN32_LEAN_AND_MEAN
  36 #include <process.h>
  37 #include <windows.h>
  38 #define strcasecmp _stricmp
  39 #else
  40 #include <pthread.h>
  41 #include <sys/time.h>
  42 #include <unistd.h>
  43 #endif
  44
  45 #ifdef USE_LIBRETRO_VFS
  46 #include <streams/file_stream_transforms.h>
  47 #undef fseeko
  48 #undef ftello
  49 #define ftello rftell
  50 #define fseeko rfseek
  51 #endif
  52
  53 #define OFF_T_MSB ((off_t)1 << (sizeof(off_t) * 8 - 1))
  54
  55 unsigned int cdrIsoMultidiskCount;
  56 unsigned int cdrIsoMultidiskSelect;
  57
  58 static FILE *cdHandle = NULL;
  59 static FILE *cddaHandle = NULL;
  60 static FILE *subHandle = NULL;
  61
  62 static boolean subChanMixed = FALSE;
  63 static boolean subChanRaw = FALSE;
  64 static boolean subChanMissing = FALSE;
  65
  66 static boolean multifile = FALSE;
  67
  68 static unsigned char cdbuffer[CD_FRAMESIZE_RAW];
  69 static unsigned char subbuffer[SUB_FRAMESIZE];
  70
  71 static boolean playing = FALSE;
  72 static boolean cddaBigEndian = FALSE;
  73 // cdda sectors in toc, byte offset in file
  74 static unsigned int cdda_cur_sector;
  75 static unsigned int cdda_file_offset;
  76 /* Frame offset into CD image where pregap data would be found if it was there.
  77  * If a game seeks there we must *not* return subchannel data since it's
  78  * not in the CD image, so that cdrom code can fake subchannel data instead.
  79  * XXX: there could be multiple pregaps but PSX dumps only have one? */
  80 static unsigned int pregapOffset;
  81
  82 #define cddaCurPos cdda_cur_sector
  83
  84 // compressed image stuff
  85 static struct {
  86         unsigned char buff_raw[16][CD_FRAMESIZE_RAW];
  87         unsigned char buff_compressed[CD_FRAMESIZE_RAW * 16 + 100];
  88         off_t *index_table;
  89         unsigned int index_len;
  90         unsigned int block_shift;
  91         unsigned int current_block;
  92         unsigned int sector_in_blk;
  93 } *compr_img;
  94
  95 #ifdef HAVE_CHD
  96 static struct {
  97         unsigned char (*buffer)[CD_FRAMESIZE_RAW + SUB_FRAMESIZE];
  98         chd_file* chd;
  99         const chd_header* header;
 100         unsigned int sectors_per_hunk;
 101         unsigned int current_hunk;
 102         unsigned int sector_in_hunk;
 103 } *chd_img;
 104 #endif
 105
 106 int (*cdimg_read_func)(FILE *f, unsigned int base, void *dest, int sector);
 107
 108 char* CALLBACK CDR__getDriveLetter(void);
 109 long CALLBACK CDR__configure(void);
 110 long CALLBACK CDR__test(void);
 111 void CALLBACK CDR__about(void);
 112 long CALLBACK CDR__setfilename(char *filename);
 113 long CALLBACK CDR__getStatus(struct CdrStat *stat);
 114
 115 static void DecodeRawSubData(void);
 116
 117 struct trackinfo {
 118         enum {DATA=1, CDDA} type;
 119         char start[3];          // MSF-format
 120         char length[3];         // MSF-format
 121         FILE *handle;           // for multi-track images CDDA
 122         unsigned int start_offset; // byte offset from start of above file
 123 };
 124
 125 #define MAXTRACKS 100 /* How many tracks can a CD hold? */
 126
 127 static int numtracks = 0;
 128 static struct trackinfo ti[MAXTRACKS];
 129
 130 // get a sector from a msf-array
 131 static unsigned int msf2sec(char *msf) {
 132         return ((msf[0] * 60 + msf[1]) * 75) + msf[2];
 133 }
 134
 135 static void sec2msf(unsigned int s, char *msf) {
 136         msf[0] = s / 75 / 60;
 137         s = s - msf[0] * 75 * 60;
 138         msf[1] = s / 75;
 139         s = s - msf[1] * 75;
 140         msf[2] = s;
 141 }
 142
 143 // divide a string of xx:yy:zz into m, s, f
 144 static void tok2msf(char *time, char *msf) {
 145         char *token;
 146
 147         token = strtok(time, ":");
 148         if (token) {
 149                 msf[0] = atoi(token);
 150         }
 151         else {
 152                 msf[0] = 0;
 153         }
 154
 155         token = strtok(NULL, ":");
 156         if (token) {
 157                 msf[1] = atoi(token);
 158         }
 159         else {
 160                 msf[1] = 0;
 161         }
 162
 163         token = strtok(NULL, ":");
 164         if (token) {
 165                 msf[2] = atoi(token);
 166         }
 167         else {
 168                 msf[2] = 0;
 169         }
 170 }
 171
 172 // this function tries to get the .toc file of the given .bin
 173 // the necessary data is put into the ti (trackinformation)-array
 174 static int parsetoc(const char *isofile) {
 175         char                    tocname[MAXPATHLEN];
 176         FILE                    *fi;
 177         char                    linebuf[256], tmp[256], name[256];
 178         char                    *token;
 179         char                    time[20], time2[20];
 180         unsigned int    t, sector_offs, sector_size;
 181         unsigned int    current_zero_gap = 0;
 182
 183         numtracks = 0;
 184
 185         // copy name of the iso and change extension from .bin to .toc
 186         strncpy(tocname, isofile, sizeof(tocname));
 187         tocname[MAXPATHLEN - 1] = '\0';
 188         if (strlen(tocname) >= 4) {
 189                 strcpy(tocname + strlen(tocname) - 4, ".toc");
 190         }
 191         else {
 192                 return -1;
 193         }
 194
 195         if ((fi = fopen(tocname, "r")) == NULL) {
 196                 // try changing extension to .cue (to satisfy some stupid tutorials)
 197                 strcpy(tocname + strlen(tocname) - 4, ".cue");
 198                 if ((fi = fopen(tocname, "r")) == NULL) {
 199                         // if filename is image.toc.bin, try removing .bin (for Brasero)
 200                         strcpy(tocname, isofile);
 201                         t = strlen(tocname);
 202                         if (t >= 8 && strcmp(tocname + t - 8, ".toc.bin") == 0) {
 203                                 tocname[t - 4] = '\0';
 204                                 if ((fi = fopen(tocname, "r")) == NULL) {
 205                                         return -1;
 206                                 }
 207                         }
 208                         else {
 209                                 return -1;
 210                         }
 211                 }
 212                 // check if it's really a TOC named as a .cue
 213                 if (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 214                         token = strtok(linebuf, " ");
 215                         if (token && strncmp(token, "CD", 2) != 0 && strcmp(token, "CATALOG") != 0) {
 216                                 fclose(fi);
 217                                 return -1;
 218                         }
 219                 }
 220                 fseek(fi, 0, SEEK_SET);
 221         }
 222
 223         memset(&ti, 0, sizeof(ti));
 224         cddaBigEndian = TRUE; // cdrdao uses big-endian for CD Audio
 225
 226         sector_size = CD_FRAMESIZE_RAW;
 227         sector_offs = 2 * 75;
 228
 229         // parse the .toc file
 230         while (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 231                 // search for tracks
 232                 strncpy(tmp, linebuf, sizeof(linebuf));
 233                 token = strtok(tmp, " ");
 234
 235                 if (token == NULL) continue;
 236
 237                 if (!strcmp(token, "TRACK")) {
 238                         sector_offs += current_zero_gap;
 239                         current_zero_gap = 0;
 240
 241                         // get type of track
 242                         token = strtok(NULL, " ");
 243                         numtracks++;
 244
 245                         if (!strncmp(token, "MODE2_RAW", 9)) {
 246                                 ti[numtracks].type = DATA;
 247                                 sec2msf(2 * 75, ti[numtracks].start); // assume data track on 0:2:0
 248
 249                                 // check if this image contains mixed subchannel data
 250                                 token = strtok(NULL, " ");
 251                                 if (token != NULL && !strncmp(token, "RW", 2)) {
 252                                         sector_size = CD_FRAMESIZE_RAW + SUB_FRAMESIZE;
 253                                         subChanMixed = TRUE;
 254                                         if (!strncmp(token, "RW_RAW", 6))
 255                                                 subChanRaw = TRUE;
 256                                 }
 257                         }
 258                         else if (!strncmp(token, "AUDIO", 5)) {
 259                                 ti[numtracks].type = CDDA;
 260                         }
 261                 }
 262                 else if (!strcmp(token, "DATAFILE")) {
 263                         if (ti[numtracks].type == CDDA) {
 264                                 sscanf(linebuf, "DATAFILE \"%[^\"]\" #%d %8s", name, &t, time2);
 265                                 ti[numtracks].start_offset = t;
 266                                 t = t / sector_size + sector_offs;
 267                                 sec2msf(t, (char *)&ti[numtracks].start);
 268                                 tok2msf((char *)&time2, (char *)&ti[numtracks].length);
 269                         }
 270                         else {
 271                                 sscanf(linebuf, "DATAFILE \"%[^\"]\" %8s", name, time);
 272                                 tok2msf((char *)&time, (char *)&ti[numtracks].length);
 273                         }
 274                 }
 275                 else if (!strcmp(token, "FILE")) {
 276                         sscanf(linebuf, "FILE \"%[^\"]\" #%d %8s %8s", name, &t, time, time2);
 277                         tok2msf((char *)&time, (char *)&ti[numtracks].start);
 278                         t += msf2sec(ti[numtracks].start) * sector_size;
 279                         ti[numtracks].start_offset = t;
 280                         t = t / sector_size + sector_offs;
 281                         sec2msf(t, (char *)&ti[numtracks].start);
 282                         tok2msf((char *)&time2, (char *)&ti[numtracks].length);
 283                 }
 284                 else if (!strcmp(token, "ZERO") || !strcmp(token, "SILENCE")) {
 285                         // skip unneeded optional fields
 286                         while (token != NULL) {
 287                                 token = strtok(NULL, " ");
 288                                 if (strchr(token, ':') != NULL)
 289                                         break;
 290                         }
 291                         if (token != NULL) {
 292                                 tok2msf(token, tmp);
 293                                 current_zero_gap = msf2sec(tmp);
 294                         }
 295                         if (numtracks > 1) {
 296                                 t = ti[numtracks - 1].start_offset;
 297                                 t /= sector_size;
 298                                 pregapOffset = t + msf2sec(ti[numtracks - 1].length);
 299                         }
 300                 }
 301                 else if (!strcmp(token, "START")) {
 302                         token = strtok(NULL, " ");
 303                         if (token != NULL && strchr(token, ':')) {
 304                                 tok2msf(token, tmp);
 305                                 t = msf2sec(tmp);
 306                                 ti[numtracks].start_offset += (t - current_zero_gap) * sector_size;
 307                                 t = msf2sec(ti[numtracks].start) + t;
 308                                 sec2msf(t, (char *)&ti[numtracks].start);
 309                         }
 310                 }
 311         }
 312
 313         fclose(fi);
 314
 315         return 0;
 316 }
 317
 318 // this function tries to get the .cue file of the given .bin
 319 // the necessary data is put into the ti (trackinformation)-array
 320 static int parsecue(const char *isofile) {
 321         char                    cuename[MAXPATHLEN];
 322         char                    filepath[MAXPATHLEN];
 323         char                    *incue_fname;
 324         FILE                    *fi;
 325         char                    *token;
 326         char                    time[20];
 327         char                    *tmp;
 328         char                    linebuf[256], tmpb[256], dummy[256];
 329         unsigned int    incue_max_len;
 330         unsigned int    t, file_len, mode, sector_offs;
 331         unsigned int    sector_size = 2352;
 332
 333         numtracks = 0;
 334
 335         // copy name of the iso and change extension from .bin to .cue
 336         strncpy(cuename, isofile, sizeof(cuename));
 337         cuename[MAXPATHLEN - 1] = '\0';
 338         if (strlen(cuename) >= 4) {
 339                 // If 'isofile' is a '.cd<X>' file, use it as a .cue file
 340                 //  and don't try to search the additional .cue file
 341                 if (strncasecmp(cuename + strlen(cuename) - 4, ".cd", 3) != 0 )
 342                         strcpy(cuename + strlen(cuename) - 4, ".cue");
 343         }
 344         else {
 345                 return -1;
 346         }
 347
 348         if ((fi = fopen(cuename, "r")) == NULL) {
 349                 return -1;
 350         }
 351
 352         // Some stupid tutorials wrongly tell users to use cdrdao to rip a
 353         // "bin/cue" image, which is in fact a "bin/toc" image. So let's check
 354         // that...
 355         if (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 356                 if (!strncmp(linebuf, "CD_ROM_XA", 9)) {
 357                         // Don't proceed further, as this is actually a .toc file rather
 358                         // than a .cue file.
 359                         fclose(fi);
 360                         return parsetoc(isofile);
 361                 }
 362                 fseek(fi, 0, SEEK_SET);
 363         }
 364
 365         // build a path for files referenced in .cue
 366         strncpy(filepath, cuename, sizeof(filepath));
 367         tmp = strrchr(filepath, '/');
 368         if (tmp == NULL)
 369                 tmp = strrchr(filepath, '\\');
 370         if (tmp != NULL)
 371                 tmp++;
 372         else
 373                 tmp = filepath;
 374         *tmp = 0;
 375         filepath[sizeof(filepath) - 1] = 0;
 376         incue_fname = tmp;
 377         incue_max_len = sizeof(filepath) - (tmp - filepath) - 1;
 378
 379         memset(&ti, 0, sizeof(ti));
 380
 381         file_len = 0;
 382         sector_offs = 2 * 75;
 383
 384         while (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 385                 strncpy(dummy, linebuf, sizeof(linebuf));
 386                 token = strtok(dummy, " ");
 387
 388                 if (token == NULL) {
 389                         continue;
 390                 }
 391
 392                 if (!strcmp(token, "TRACK")) {
 393                         numtracks++;
 394
 395                         sector_size = 0;
 396                         if (strstr(linebuf, "AUDIO") != NULL) {
 397                                 ti[numtracks].type = CDDA;
 398                                 sector_size = 2352;
 399                         }
 400                         else if (sscanf(linebuf, " TRACK %u MODE%u/%u", &t, &mode, &sector_size) == 3)
 401                                 ti[numtracks].type = DATA;
 402                         else {
 403                                 SysPrintf(".cue: failed to parse TRACK\n");
 404                                 ti[numtracks].type = numtracks == 1 ? DATA : CDDA;
 405                         }
 406                         if (sector_size == 0)
 407                                 sector_size = 2352;
 408                 }
 409                 else if (!strcmp(token, "INDEX")) {
 410                         if (sscanf(linebuf, " INDEX %02d %8s", &t, time) != 2)
 411                                 SysPrintf(".cue: failed to parse INDEX\n");
 412                         tok2msf(time, (char *)&ti[numtracks].start);
 413
 414                         t = msf2sec(ti[numtracks].start);
 415                         ti[numtracks].start_offset = t * sector_size;
 416                         t += sector_offs;
 417                         sec2msf(t, ti[numtracks].start);
 418
 419                         // default track length to file length
 420                         t = file_len - ti[numtracks].start_offset / sector_size;
 421                         sec2msf(t, ti[numtracks].length);
 422
 423                         if (numtracks > 1 && ti[numtracks].handle == NULL) {
 424                                 // this track uses the same file as the last,
 425                                 // start of this track is last track's end
 426                                 t = msf2sec(ti[numtracks].start) - msf2sec(ti[numtracks - 1].start);
 427                                 sec2msf(t, ti[numtracks - 1].length);
 428                         }
 429                         if (numtracks > 1 && pregapOffset == -1)
 430                                 pregapOffset = ti[numtracks].start_offset / sector_size;
 431                 }
 432                 else if (!strcmp(token, "PREGAP")) {
 433                         if (sscanf(linebuf, " PREGAP %8s", time) == 1) {
 434                                 tok2msf(time, dummy);
 435                                 sector_offs += msf2sec(dummy);
 436                         }
 437                         pregapOffset = -1; // mark to fill track start_offset
 438                 }
 439                 else if (!strcmp(token, "FILE")) {
 440                         t = sscanf(linebuf, " FILE \"%255[^\"]\"", tmpb);
 441                         if (t != 1)
 442                                 sscanf(linebuf, " FILE %255s", tmpb);
 443
 444                         tmp = strrchr(tmpb, '\\');
 445                         if (tmp == NULL)
 446                                 tmp = strrchr(tmpb, '/');
 447                         if (tmp != NULL)
 448                                 tmp++;
 449                         else
 450                                 tmp = tmpb;
 451                         strncpy(incue_fname, tmp, incue_max_len);
 452                         ti[numtracks + 1].handle = fopen(filepath, "rb");
 453
 454                         // update global offset if this is not first file in this .cue
 455                         if (numtracks + 1 > 1) {
 456                                 multifile = 1;
 457                                 sector_offs += file_len;
 458                         }
 459
 460                         file_len = 0;
 461                         if (ti[numtracks + 1].handle == NULL) {
 462                                 SysPrintf(_("\ncould not open: %s\n"), filepath);
 463                                 continue;
 464                         }
 465                         fseek(ti[numtracks + 1].handle, 0, SEEK_END);
 466                         file_len = ftell(ti[numtracks + 1].handle) / 2352;
 467
 468                         if (numtracks == 0 && strlen(isofile) >= 4 &&
 469                                 (strcmp(isofile + strlen(isofile) - 4, ".cue") == 0 ||
 470                                 strncasecmp(isofile + strlen(isofile) - 4, ".cd", 3) == 0)) {
 471                                 // user selected .cue/.cdX as image file, use it's data track instead
 472                                 fclose(cdHandle);
 473                                 cdHandle = fopen(filepath, "rb");
 474                         }
 475                 }
 476         }
 477
 478         fclose(fi);
 479
 480         // if there are no tracks detected, then it's not a cue file
 481         if (!numtracks)
 482                 return -1;
 483
 484         return 0;
 485 }
 486
 487 // this function tries to get the .ccd file of the given .img
 488 // the necessary data is put into the ti (trackinformation)-array
 489 static int parseccd(const char *isofile) {
 490         char                    ccdname[MAXPATHLEN];
 491         FILE                    *fi;
 492         char                    linebuf[256];
 493         unsigned int    t;
 494
 495         numtracks = 0;
 496
 497         // copy name of the iso and change extension from .img to .ccd
 498         strncpy(ccdname, isofile, sizeof(ccdname));
 499         ccdname[MAXPATHLEN - 1] = '\0';
 500         if (strlen(ccdname) >= 4) {
 501                 strcpy(ccdname + strlen(ccdname) - 4, ".ccd");
 502         }
 503         else {
 504                 return -1;
 505         }
 506
 507         if ((fi = fopen(ccdname, "r")) == NULL) {
 508                 return -1;
 509         }
 510
 511         memset(&ti, 0, sizeof(ti));
 512
 513         while (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 514                 if (!strncmp(linebuf, "[TRACK", 6)){
 515                         numtracks++;
 516                 }
 517                 else if (!strncmp(linebuf, "MODE=", 5)) {
 518                         sscanf(linebuf, "MODE=%d", &t);
 519                         ti[numtracks].type = ((t == 0) ? CDDA : DATA);
 520                 }
 521                 else if (!strncmp(linebuf, "INDEX 1=", 8)) {
 522                         sscanf(linebuf, "INDEX 1=%d", &t);
 523                         sec2msf(t + 2 * 75, ti[numtracks].start);
 524                         ti[numtracks].start_offset = t * 2352;
 525
 526                         // If we've already seen another track, this is its end
 527                         if (numtracks > 1) {
 528                                 t = msf2sec(ti[numtracks].start) - msf2sec(ti[numtracks - 1].start);
 529                                 sec2msf(t, ti[numtracks - 1].length);
 530                         }
 531                 }
 532         }
 533
 534         fclose(fi);
 535
 536         // Fill out the last track's end based on size
 537         if (numtracks >= 1) {
 538                 fseek(cdHandle, 0, SEEK_END);
 539                 t = ftell(cdHandle) / 2352 - msf2sec(ti[numtracks].start) + 2 * 75;
 540                 sec2msf(t, ti[numtracks].length);
 541         }
 542
 543         return 0;
 544 }
 545
 546 // this function tries to get the .mds file of the given .mdf
 547 // the necessary data is put into the ti (trackinformation)-array
 548 static int parsemds(const char *isofile) {
 549         char                    mdsname[MAXPATHLEN];
 550         FILE                    *fi;
 551         unsigned int    offset, extra_offset, l, i;
 552         unsigned short  s;
 553
 554         numtracks = 0;
 555
 556         // copy name of the iso and change extension from .mdf to .mds
 557         strncpy(mdsname, isofile, sizeof(mdsname));
 558         mdsname[MAXPATHLEN - 1] = '\0';
 559         if (strlen(mdsname) >= 4) {
 560                 strcpy(mdsname + strlen(mdsname) - 4, ".mds");
 561         }
 562         else {
 563                 return -1;
 564         }
 565
 566         if ((fi = fopen(mdsname, "rb")) == NULL) {
 567                 return -1;
 568         }
 569
 570         memset(&ti, 0, sizeof(ti));
 571
 572         // check if it's a valid mds file
 573         if (fread(&i, 1, sizeof(i), fi) != sizeof(i))
 574                 goto fail_io;
 575         i = SWAP32(i);
 576         if (i != 0x4944454D) {
 577                 // not an valid mds file
 578                 fclose(fi);
 579                 return -1;
 580         }
 581
 582         // get offset to session block
 583         fseek(fi, 0x50, SEEK_SET);
 584         if (fread(&offset, 1, sizeof(offset), fi) != sizeof(offset))
 585                 goto fail_io;
 586         offset = SWAP32(offset);
 587
 588         // get total number of tracks
 589         offset += 14;
 590         fseek(fi, offset, SEEK_SET);
 591         if (fread(&s, 1, sizeof(s), fi) != sizeof(s))
 592                 goto fail_io;
 593         s = SWAP16(s);
 594         numtracks = s;
 595
 596         // get offset to track blocks
 597         fseek(fi, 4, SEEK_CUR);
 598         if (fread(&offset, 1, sizeof(offset), fi) != sizeof(offset))
 599                 goto fail_io;
 600         offset = SWAP32(offset);
 601
 602         // skip lead-in data
 603         while (1) {
 604                 fseek(fi, offset + 4, SEEK_SET);
 605                 if (fgetc(fi) < 0xA0) {
 606                         break;
 607                 }
 608                 offset += 0x50;
 609         }
 610
 611         // check if the image contains mixed subchannel data
 612         fseek(fi, offset + 1, SEEK_SET);
 613         subChanMixed = subChanRaw = (fgetc(fi) ? TRUE : FALSE);
 614
 615         // read track data
 616         for (i = 1; i <= numtracks; i++) {
 617                 fseek(fi, offset, SEEK_SET);
 618
 619                 // get the track type
 620                 ti[i].type = ((fgetc(fi) == 0xA9) ? CDDA : DATA);
 621                 fseek(fi, 8, SEEK_CUR);
 622
 623                 // get the track starting point
 624                 ti[i].start[0] = fgetc(fi);
 625                 ti[i].start[1] = fgetc(fi);
 626                 ti[i].start[2] = fgetc(fi);
 627
 628                 if (fread(&extra_offset, 1, sizeof(extra_offset), fi) != sizeof(extra_offset))
 629                         goto fail_io;
 630                 extra_offset = SWAP32(extra_offset);
 631
 632                 // get track start offset (in .mdf)
 633                 fseek(fi, offset + 0x28, SEEK_SET);
 634                 if (fread(&l, 1, sizeof(l), fi) != sizeof(l))
 635                         goto fail_io;
 636                 l = SWAP32(l);
 637                 ti[i].start_offset = l;
 638
 639                 // get pregap
 640                 fseek(fi, extra_offset, SEEK_SET);
 641                 if (fread(&l, 1, sizeof(l), fi) != sizeof(l))
 642                         goto fail_io;
 643                 l = SWAP32(l);
 644                 if (l != 0 && i > 1)
 645                         pregapOffset = msf2sec(ti[i].start);
 646
 647                 // get the track length
 648                 if (fread(&l, 1, sizeof(l), fi) != sizeof(l))
 649                         goto fail_io;
 650                 l = SWAP32(l);
 651                 sec2msf(l, ti[i].length);
 652
 653                 offset += 0x50;
 654         }
 655         fclose(fi);
 656         return 0;
 657 fail_io:
 658 #ifndef NDEBUG
 659         SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
 660 #endif
 661         fclose(fi);
 662         return -1;
 663 }
 664
 665 static int handlepbp(const char *isofile) {
 666         struct {
 667                 unsigned int sig;
 668                 unsigned int dontcare[8];
 669                 unsigned int psar_offs;
 670         } pbp_hdr;
 671         struct {
 672                 unsigned char type;
 673                 unsigned char pad0;
 674                 unsigned char track;
 675                 char index0[3];
 676                 char pad1;
 677                 char index1[3];
 678         } toc_entry;
 679         struct {
 680                 unsigned int offset;
 681                 unsigned int size;
 682                 unsigned int dontcare[6];
 683         } index_entry;
 684         char psar_sig[11];
 685         off_t psisoimg_offs, cdimg_base;
 686         unsigned int t, cd_length;
 687         unsigned int offsettab[8];
 688         unsigned int psar_offs, index_entry_size, index_entry_offset;
 689         const char *ext = NULL;
 690         int i, ret;
 691
 692         if (strlen(isofile) >= 4)
 693                 ext = isofile + strlen(isofile) - 4;
 694         if (ext == NULL || (strcmp(ext, ".pbp") != 0 && strcmp(ext, ".PBP") != 0))
 695                 return -1;
 696
 697         fseeko(cdHandle, 0, SEEK_SET);
 698
 699         numtracks = 0;
 700
 701         ret = fread(&pbp_hdr, 1, sizeof(pbp_hdr), cdHandle);
 702         if (ret != sizeof(pbp_hdr)) {
 703                 SysPrintf("failed to read pbp\n");
 704                 goto fail_io;
 705         }
 706
 707         psar_offs = SWAP32(pbp_hdr.psar_offs);
 708
 709         ret = fseeko(cdHandle, psar_offs, SEEK_SET);
 710         if (ret != 0) {
 711                 SysPrintf("failed to seek to %x\n", psar_offs);
 712                 goto fail_io;
 713         }
 714
 715         psisoimg_offs = psar_offs;
 716         if (fread(psar_sig, 1, sizeof(psar_sig), cdHandle) != sizeof(psar_sig))
 717                 goto fail_io;
 718         psar_sig[10] = 0;
 719         if (strcmp(psar_sig, "PSTITLEIMG") == 0) {
 720                 // multidisk image?
 721                 ret = fseeko(cdHandle, psar_offs + 0x200, SEEK_SET);
 722                 if (ret != 0) {
 723                         SysPrintf("failed to seek to %x\n", psar_offs + 0x200);
 724                         goto fail_io;
 725                 }
 726
 727                 if (fread(&offsettab, 1, sizeof(offsettab), cdHandle) != sizeof(offsettab)) {
 728                         SysPrintf("failed to read offsettab\n");
 729                         goto fail_io;
 730                 }
 731
 732                 for (i = 0; i < sizeof(offsettab) / sizeof(offsettab[0]); i++) {
 733                         if (offsettab[i] == 0)
 734                                 break;
 735                 }
 736                 cdrIsoMultidiskCount = i;
 737                 if (cdrIsoMultidiskCount == 0) {
 738                         SysPrintf("multidisk eboot has 0 images?\n");
 739                         goto fail_io;
 740                 }
 741
 742                 if (cdrIsoMultidiskSelect >= cdrIsoMultidiskCount)
 743                         cdrIsoMultidiskSelect = 0;
 744
 745                 psisoimg_offs += SWAP32(offsettab[cdrIsoMultidiskSelect]);
 746
 747                 ret = fseeko(cdHandle, psisoimg_offs, SEEK_SET);
 748                 if (ret != 0) {
 749                         SysPrintf("failed to seek to %llx\n", (long long)psisoimg_offs);
 750                         goto fail_io;
 751                 }
 752
 753                 if (fread(psar_sig, 1, sizeof(psar_sig), cdHandle) != sizeof(psar_sig))
 754                         goto fail_io;
 755                 psar_sig[10] = 0;
 756         }
 757
 758         if (strcmp(psar_sig, "PSISOIMG00") != 0) {
 759                 SysPrintf("bad psar_sig: %s\n", psar_sig);
 760                 goto fail_io;
 761         }
 762
 763         // seek to TOC
 764         ret = fseeko(cdHandle, psisoimg_offs + 0x800, SEEK_SET);
 765         if (ret != 0) {
 766                 SysPrintf("failed to seek to %llx\n", (long long)psisoimg_offs + 0x800);
 767                 goto fail_io;
 768         }
 769
 770         // first 3 entries are special
 771         fseek(cdHandle, sizeof(toc_entry), SEEK_CUR);
 772         if (fread(&toc_entry, 1, sizeof(toc_entry), cdHandle) != sizeof(toc_entry))
 773                 goto fail_io;
 774         numtracks = btoi(toc_entry.index1[0]);
 775
 776         if (fread(&toc_entry, 1, sizeof(toc_entry), cdHandle) != sizeof(toc_entry))
 777                 goto fail_io;
 778         cd_length = btoi(toc_entry.index1[0]) * 60 * 75 +
 779                 btoi(toc_entry.index1[1]) * 75 + btoi(toc_entry.index1[2]);
 780
 781         for (i = 1; i <= numtracks; i++) {
 782                 if (fread(&toc_entry, 1, sizeof(toc_entry), cdHandle) != sizeof(toc_entry))
 783                         goto fail_io;
 784
 785                 ti[i].type = (toc_entry.type == 1) ? CDDA : DATA;
 786
 787                 ti[i].start_offset = btoi(toc_entry.index0[0]) * 60 * 75 +
 788                         btoi(toc_entry.index0[1]) * 75 + btoi(toc_entry.index0[2]);
 789                 ti[i].start_offset *= 2352;
 790                 ti[i].start[0] = btoi(toc_entry.index1[0]);
 791                 ti[i].start[1] = btoi(toc_entry.index1[1]);
 792                 ti[i].start[2] = btoi(toc_entry.index1[2]);
 793
 794                 if (i > 1) {
 795                         t = msf2sec(ti[i].start) - msf2sec(ti[i - 1].start);
 796                         sec2msf(t, ti[i - 1].length);
 797                 }
 798         }
 799         t = cd_length - ti[numtracks].start_offset / 2352;
 800         sec2msf(t, ti[numtracks].length);
 801
 802         // seek to ISO index
 803         ret = fseeko(cdHandle, psisoimg_offs + 0x4000, SEEK_SET);
 804         if (ret != 0) {
 805                 SysPrintf("failed to seek to ISO index\n");
 806                 goto fail_io;
 807         }
 808
 809         compr_img = calloc(1, sizeof(*compr_img));
 810         if (compr_img == NULL)
 811                 goto fail_io;
 812
 813         compr_img->block_shift = 4;
 814         compr_img->current_block = (unsigned int)-1;
 815
 816         compr_img->index_len = (0x100000 - 0x4000) / sizeof(index_entry);
 817         compr_img->index_table = malloc((compr_img->index_len + 1) * sizeof(compr_img->index_table[0]));
 818         if (compr_img->index_table == NULL)
 819                 goto fail_io;
 820
 821         cdimg_base = psisoimg_offs + 0x100000;
 822         for (i = 0; i < compr_img->index_len; i++) {
 823                 ret = fread(&index_entry, 1, sizeof(index_entry), cdHandle);
 824                 if (ret != sizeof(index_entry)) {
 825                         SysPrintf("failed to read index_entry #%d\n", i);
 826                         goto fail_index;
 827                 }
 828
 829                 index_entry_size = SWAP32(index_entry.size);
 830                 index_entry_offset = SWAP32(index_entry.offset);
 831
 832                 if (index_entry_size == 0)
 833                         break;
 834
 835                 compr_img->index_table[i] = cdimg_base + index_entry_offset;
 836         }
 837         compr_img->index_table[i] = cdimg_base + index_entry_offset + index_entry_size;
 838
 839         return 0;
 840
 841 fail_index:
 842         free(compr_img->index_table);
 843         compr_img->index_table = NULL;
 844         goto done;
 845
 846 fail_io:
 847 #ifndef NDEBUG
 848         SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
 849 #endif
 850
 851 done:
 852         if (compr_img != NULL) {
 853                 free(compr_img);
 854                 compr_img = NULL;
 855         }
 856         return -1;
 857 }
 858
 859 static int handlecbin(const char *isofile) {
 860         struct
 861         {
 862                 char magic[4];
 863                 unsigned int header_size;
 864                 unsigned long long total_bytes;
 865                 unsigned int block_size;
 866                 unsigned char ver;              // 1
 867                 unsigned char align;
 868                 unsigned char rsv_06[2];
 869         } ciso_hdr;
 870         const char *ext = NULL;
 871         unsigned int *index_table = NULL;
 872         unsigned int index = 0, plain;
 873         int i, ret;
 874
 875         if (strlen(isofile) >= 5)
 876                 ext = isofile + strlen(isofile) - 5;
 877         if (ext == NULL || (strcasecmp(ext + 1, ".cbn") != 0 && strcasecmp(ext, ".cbin") != 0))
 878                 return -1;
 879
 880         fseek(cdHandle, 0, SEEK_SET);
 881
 882         ret = fread(&ciso_hdr, 1, sizeof(ciso_hdr), cdHandle);
 883         if (ret != sizeof(ciso_hdr)) {
 884                 SysPrintf("failed to read ciso header\n");
 885                 return -1;
 886         }
 887
 888         if (strncmp(ciso_hdr.magic, "CISO", 4) != 0 || ciso_hdr.total_bytes <= 0 || ciso_hdr.block_size <= 0) {
 889                 SysPrintf("bad ciso header\n");
 890                 return -1;
 891         }
 892         if (ciso_hdr.header_size != 0 && ciso_hdr.header_size != sizeof(ciso_hdr)) {
 893                 ret = fseeko(cdHandle, ciso_hdr.header_size, SEEK_SET);
 894                 if (ret != 0) {
 895                         SysPrintf("failed to seek to %x\n", ciso_hdr.header_size);
 896                         return -1;
 897                 }
 898         }
 899
 900         compr_img = calloc(1, sizeof(*compr_img));
 901         if (compr_img == NULL)
 902                 goto fail_io;
 903
 904         compr_img->block_shift = 0;
 905         compr_img->current_block = (unsigned int)-1;
 906
 907         compr_img->index_len = ciso_hdr.total_bytes / ciso_hdr.block_size;
 908         index_table = malloc((compr_img->index_len + 1) * sizeof(index_table[0]));
 909         if (index_table == NULL)
 910                 goto fail_io;
 911
 912         ret = fread(index_table, sizeof(index_table[0]), compr_img->index_len, cdHandle);
 913         if (ret != compr_img->index_len) {
 914                 SysPrintf("failed to read index table\n");
 915                 goto fail_index;
 916         }
 917
 918         compr_img->index_table = malloc((compr_img->index_len + 1) * sizeof(compr_img->index_table[0]));
 919         if (compr_img->index_table == NULL)
 920                 goto fail_index;
 921
 922         for (i = 0; i < compr_img->index_len + 1; i++) {
 923                 index = index_table[i];
 924                 plain = index & 0x80000000;
 925                 index &= 0x7fffffff;
 926                 compr_img->index_table[i] = (off_t)index << ciso_hdr.align;
 927                 if (plain)
 928                         compr_img->index_table[i] |= OFF_T_MSB;
 929         }
 930
 931         return 0;
 932
 933 fail_index:
 934         free(index_table);
 935 fail_io:
 936         if (compr_img != NULL) {
 937                 free(compr_img);
 938                 compr_img = NULL;
 939         }
 940         return -1;
 941 }
 942
 943 #ifdef HAVE_CHD
 944 static int handlechd(const char *isofile) {
 945         chd_img = calloc(1, sizeof(*chd_img));
 946         if (chd_img == NULL)
 947                 goto fail_io;
 948
 949         if(chd_open(isofile, CHD_OPEN_READ, NULL, &chd_img->chd) != CHDERR_NONE)
 950                 goto fail_io;
 951
 952         if (Config.CHD_Precache && (chd_precache(chd_img->chd) != CHDERR_NONE))
 953                 goto fail_io;
 954
 955    chd_img->header = chd_get_header(chd_img->chd);
 956
 957    chd_img->buffer = malloc(chd_img->header->hunkbytes);
 958    if (chd_img->buffer == NULL)
 959                 goto fail_io;
 960
 961    chd_img->sectors_per_hunk = chd_img->header->hunkbytes / (CD_FRAMESIZE_RAW + SUB_FRAMESIZE);
 962    chd_img->current_hunk = (unsigned int)-1;
 963
 964    cddaBigEndian = TRUE;
 965
 966         numtracks = 0;
 967         int frame_offset = 0;
 968         int file_offset = 0;
 969         memset(ti, 0, sizeof(ti));
 970
 971    while (1)
 972    {
 973       struct {
 974          char type[64];
 975          char subtype[32];
 976          char pgtype[32];
 977          char pgsub[32];
 978          uint32_t track;
 979          uint32_t frames;
 980          uint32_t pregap;
 981          uint32_t postgap;
 982       } md = {};
 983       char meta[256];
 984       uint32_t meta_size = 0;
 985
 986       if (chd_get_metadata(chd_img->chd, CDROM_TRACK_METADATA2_TAG, numtracks, meta, sizeof(meta), &meta_size, NULL, NULL) == CHDERR_NONE)
 987          sscanf(meta, CDROM_TRACK_METADATA2_FORMAT, &md.track, md.type, md.subtype, &md.frames, &md.pregap, md.pgtype, md.pgsub, &md.postgap);
 988       else if (chd_get_metadata(chd_img->chd, CDROM_TRACK_METADATA_TAG, numtracks, meta, sizeof(meta), &meta_size, NULL, NULL) == CHDERR_NONE)
 989          sscanf(meta, CDROM_TRACK_METADATA_FORMAT, &md.track, md.type, md.subtype, &md.frames);
 990       else
 991          break;
 992
 993                 SysPrintf("chd: %s\n", meta);
 994
 995                 if (md.track == 1) {
 996                         md.pregap = 150;
 997                         if (!strncmp(md.subtype, "RW", 2)) {
 998                                 subChanMixed = TRUE;
 999                                 if (!strcmp(md.subtype, "RW_RAW"))
1000                                         subChanRaw = TRUE;
1001                         }
1002                 }
1003                 else
1004                         sec2msf(msf2sec(ti[md.track-1].length) + md.pregap, ti[md.track-1].length);
1005
1006                 ti[md.track].type = !strncmp(md.type, "AUDIO", 5) ? CDDA : DATA;
1007
1008                 sec2msf(frame_offset + md.pregap, ti[md.track].start);
1009                 sec2msf(md.frames, ti[md.track].length);
1010
1011                 ti[md.track].start_offset = file_offset;
1012
1013                 frame_offset += md.pregap + md.frames + md.postgap;
1014                 file_offset += md.frames + md.postgap;
1015                 numtracks++;
1016         }
1017
1018         if (numtracks)
1019                 return 0;
1020
1021 fail_io:
1022         if (chd_img != NULL) {
1023                 free(chd_img->buffer);
1024                 free(chd_img);
1025                 chd_img = NULL;
1026         }
1027         return -1;
1028 }
1029 #endif
1030
1031 // this function tries to get the .sub file of the given .img
1032 static int opensubfile(const char *isoname) {
1033         char            subname[MAXPATHLEN];
1034
1035         // copy name of the iso and change extension from .img to .sub
1036         strncpy(subname, isoname, sizeof(subname));
1037         subname[MAXPATHLEN - 1] = '\0';
1038         if (strlen(subname) >= 4) {
1039                 strcpy(subname + strlen(subname) - 4, ".sub");
1040         }
1041         else {
1042                 return -1;
1043         }
1044
1045         subHandle = fopen(subname, "rb");
1046         if (subHandle == NULL) {
1047                 return -1;
1048         }
1049
1050         return 0;
1051 }
1052
1053 static int opensbifile(const char *isoname) {
1054         char            sbiname[MAXPATHLEN], disknum[MAXPATHLEN] = "0";
1055         int             s;
1056
1057         strncpy(sbiname, isoname, sizeof(sbiname));
1058         sbiname[MAXPATHLEN - 1] = '\0';
1059         if (strlen(sbiname) >= 4) {
1060                 if (cdrIsoMultidiskCount > 1) {
1061                         sprintf(disknum, "_%i.sbi", cdrIsoMultidiskSelect + 1);
1062                         strcpy(sbiname + strlen(sbiname) - 4, disknum);
1063                 }
1064                 else
1065                         strcpy(sbiname + strlen(sbiname) - 4, ".sbi");
1066         }
1067         else {
1068                 return -1;
1069         }
1070
1071         fseek(cdHandle, 0, SEEK_END);
1072         s = ftell(cdHandle) / 2352;
1073
1074         return LoadSBI(sbiname, s);
1075 }
1076
1077 #ifdef _WIN32
1078 static void readThreadStop() {}
1079 static void readThreadStart() {}
1080 #else
1081 static pthread_t read_thread_id;
1082
1083 static pthread_cond_t read_thread_msg_avail;
1084 static pthread_cond_t read_thread_msg_done;
1085 static pthread_mutex_t read_thread_msg_lock;
1086
1087 static pthread_cond_t sectorbuffer_cond;
1088 static pthread_mutex_t sectorbuffer_lock;
1089
1090 static boolean read_thread_running = FALSE;
1091 static int read_thread_sector_start = -1;
1092 static int read_thread_sector_end = -1;
1093
1094 typedef struct {
1095   int sector;
1096   long ret;
1097   unsigned char data[CD_FRAMESIZE_RAW];
1098 } SectorBufferEntry;
1099
1100 #define SECTOR_BUFFER_SIZE 4096
1101
1102 static SectorBufferEntry *sectorbuffer;
1103 static size_t sectorbuffer_index;
1104
1105 int (*sync_cdimg_read_func)(FILE *f, unsigned int base, void *dest, int sector);
1106 unsigned char *(*sync_CDR_getBuffer)(void);
1107
1108 static unsigned char * CALLBACK ISOgetBuffer_async(void);
1109 static int cdread_async(FILE *f, unsigned int base, void *dest, int sector);
1110
1111 static void *readThreadMain(void *param) {
1112   int max_sector = -1;
1113   int requested_sector_start = -1;
1114   int requested_sector_end = -1;
1115   int last_read_sector = -1;
1116   int index = 0;
1117
1118   int ra_sector = -1;
1119   int max_ra = 128;
1120   int initial_ra = 1;
1121   int speedmult_ra = 4;
1122
1123   int ra_count = 0;
1124   int how_far_ahead = 0;
1125
1126   unsigned char tmpdata[CD_FRAMESIZE_RAW];
1127   long ret;
1128
1129   max_sector = msf2sec(ti[numtracks].start) + msf2sec(ti[numtracks].length);
1130
1131   while(1) {
1132     pthread_mutex_lock(&read_thread_msg_lock);
1133
1134     // If we don't have readahead and we don't have a sector request, wait for one.
1135     // If we still have readahead to go, don't block, just keep going.
1136     // And if we ever have a sector request pending, acknowledge and reset it.
1137
1138     if (!ra_count) {
1139       if (read_thread_sector_start == -1 && read_thread_running) {
1140         pthread_cond_wait(&read_thread_msg_avail, &read_thread_msg_lock);
1141       }
1142     }
1143
1144     if (read_thread_sector_start != -1) {
1145       requested_sector_start = read_thread_sector_start;
1146       requested_sector_end = read_thread_sector_end;
1147       read_thread_sector_start = -1;
1148       read_thread_sector_end = -1;
1149       pthread_cond_signal(&read_thread_msg_done);
1150     }
1151
1152     pthread_mutex_unlock(&read_thread_msg_lock);
1153
1154     if (!read_thread_running)
1155       break;
1156
1157     // Readahead code, based on the implementation in mednafen psx's cdromif.cpp
1158     if (requested_sector_start != -1) {
1159       if (last_read_sector != -1 && last_read_sector == (requested_sector_start - 1)) {
1160         how_far_ahead = ra_sector - requested_sector_end;
1161
1162         if(how_far_ahead <= max_ra)
1163           ra_count = (max_ra - how_far_ahead + 1 ? max_ra - how_far_ahead + 1 : speedmult_ra);
1164         else
1165           ra_count++;
1166       } else if (requested_sector_end != last_read_sector) {
1167         ra_sector = requested_sector_end;
1168         ra_count = initial_ra;
1169       }
1170
1171       last_read_sector = requested_sector_end;
1172     }
1173
1174     index = ra_sector % SECTOR_BUFFER_SIZE;
1175
1176     // check for end of CD
1177     if (ra_count && ra_sector >= max_sector) {
1178       ra_count = 0;
1179       pthread_mutex_lock(&sectorbuffer_lock);
1180       sectorbuffer[index].ret = -1;
1181       sectorbuffer[index].sector = ra_sector;
1182       pthread_cond_signal(&sectorbuffer_cond);
1183       pthread_mutex_unlock(&sectorbuffer_lock);
1184     }
1185
1186     if (ra_count) {
1187       pthread_mutex_lock(&sectorbuffer_lock);
1188       if (sectorbuffer[index].sector != ra_sector) {
1189         pthread_mutex_unlock(&sectorbuffer_lock);
1190
1191         ret = sync_cdimg_read_func(cdHandle, 0, tmpdata, ra_sector);
1192
1193         pthread_mutex_lock(&sectorbuffer_lock);
1194         sectorbuffer[index].ret = ret;
1195         sectorbuffer[index].sector = ra_sector;
1196         memcpy(sectorbuffer[index].data, tmpdata, CD_FRAMESIZE_RAW);
1197       }
1198       pthread_cond_signal(&sectorbuffer_cond);
1199       pthread_mutex_unlock(&sectorbuffer_lock);
1200
1201       ra_sector++;
1202       ra_count--;
1203     }
1204   }
1205
1206   return NULL;
1207 }
1208
1209 static void readThreadStop() {
1210   if (read_thread_running == TRUE) {
1211     read_thread_running = FALSE;
1212     pthread_cond_signal(&read_thread_msg_avail);
1213     pthread_join(read_thread_id, NULL);
1214   }
1215
1216   pthread_cond_destroy(&read_thread_msg_done);
1217   pthread_cond_destroy(&read_thread_msg_avail);
1218   pthread_mutex_destroy(&read_thread_msg_lock);
1219
1220   pthread_cond_destroy(&sectorbuffer_cond);
1221   pthread_mutex_destroy(&sectorbuffer_lock);
1222
1223   CDR_getBuffer = sync_CDR_getBuffer;
1224   cdimg_read_func = sync_cdimg_read_func;
1225
1226   free(sectorbuffer);
1227   sectorbuffer = NULL;
1228 }
1229
1230 static void readThreadStart() {
1231   SysPrintf("Starting async CD thread\n");
1232
1233   if (read_thread_running == TRUE)
1234     return;
1235
1236   read_thread_running = TRUE;
1237   read_thread_sector_start = -1;
1238   read_thread_sector_end = -1;
1239   sectorbuffer_index = 0;
1240
1241   sectorbuffer = calloc(SECTOR_BUFFER_SIZE, sizeof(SectorBufferEntry));
1242   if(!sectorbuffer)
1243     goto error;
1244
1245   sectorbuffer[0].sector = -1; // Otherwise we might think we've already fetched sector 0!
1246
1247   sync_CDR_getBuffer = CDR_getBuffer;
1248   CDR_getBuffer = ISOgetBuffer_async;
1249   sync_cdimg_read_func = cdimg_read_func;
1250   cdimg_read_func = cdread_async;
1251
1252   if (pthread_cond_init(&read_thread_msg_avail, NULL) ||
1253       pthread_cond_init(&read_thread_msg_done, NULL) ||
1254       pthread_mutex_init(&read_thread_msg_lock, NULL) ||
1255       pthread_cond_init(&sectorbuffer_cond, NULL) ||
1256       pthread_mutex_init(&sectorbuffer_lock, NULL) ||
1257       pthread_create(&read_thread_id, NULL, readThreadMain, NULL))
1258     goto error;
1259
1260   return;
1261
1262  error:
1263   SysPrintf("Error starting async CD thread\n");
1264   SysPrintf("Falling back to sync\n");
1265
1266   readThreadStop();
1267 }
1268 #endif
1269
1270 static int cdread_normal(FILE *f, unsigned int base, void *dest, int sector)
1271 {
1272         fseek(f, base + sector * CD_FRAMESIZE_RAW, SEEK_SET);
1273         return fread(dest, 1, CD_FRAMESIZE_RAW, f);
1274 }
1275
1276 static int cdread_sub_mixed(FILE *f, unsigned int base, void *dest, int sector)
1277 {
1278         int ret;
1279
1280         fseek(f, base + sector * (CD_FRAMESIZE_RAW + SUB_FRAMESIZE), SEEK_SET);
1281         ret = fread(dest, 1, CD_FRAMESIZE_RAW, f);
1282         if (fread(subbuffer, 1, SUB_FRAMESIZE, f) != SUB_FRAMESIZE)
1283                 goto fail_io;
1284
1285         if (subChanRaw) DecodeRawSubData();
1286         goto done;
1287
1288 fail_io:
1289 #ifndef NDEBUG
1290         SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
1291 #endif
1292
1293 done:
1294         return ret;
1295 }
1296
1297 static int uncompress2_pcsx(void *out, unsigned long *out_size, void *in, unsigned long in_size)
1298 {
1299         static z_stream z;
1300         int ret = 0;
1301
1302         if (z.zalloc == NULL) {
1303                 // XXX: one-time leak here..
1304                 z.next_in = Z_NULL;
1305                 z.avail_in = 0;
1306                 z.zalloc = Z_NULL;
1307                 z.zfree = Z_NULL;
1308                 z.opaque = Z_NULL;
1309                 ret = inflateInit2(&z, -15);
1310         }
1311         else
1312                 ret = inflateReset(&z);
1313         if (ret != Z_OK)
1314                 return ret;
1315
1316         z.next_in = in;
1317         z.avail_in = in_size;
1318         z.next_out = out;
1319         z.avail_out = *out_size;
1320
1321         ret = inflate(&z, Z_NO_FLUSH);
1322         //inflateEnd(&z);
1323
1324         *out_size -= z.avail_out;
1325         return ret == 1 ? 0 : ret;
1326 }
1327
1328 static int cdread_compressed(FILE *f, unsigned int base, void *dest, int sector)
1329 {
1330         unsigned long cdbuffer_size, cdbuffer_size_expect;
1331         unsigned int size;
1332         int is_compressed;
1333         off_t start_byte;
1334         int ret, block;
1335
1336         if (base)
1337                 sector += base / 2352;
1338
1339         block = sector >> compr_img->block_shift;
1340         compr_img->sector_in_blk = sector & ((1 << compr_img->block_shift) - 1);
1341
1342         if (block == compr_img->current_block) {
1343                 //printf("hit sect %d\n", sector);
1344                 goto finish;
1345         }
1346
1347         if (sector >= compr_img->index_len * 16) {
1348                 SysPrintf("sector %d is past img end\n", sector);
1349                 return -1;
1350         }
1351
1352         start_byte = compr_img->index_table[block] & ~OFF_T_MSB;
1353         if (fseeko(cdHandle, start_byte, SEEK_SET) != 0) {
1354                 SysPrintf("seek error for block %d at %llx: ",
1355                         block, (long long)start_byte);
1356                 perror(NULL);
1357                 return -1;
1358         }
1359
1360         is_compressed = !(compr_img->index_table[block] & OFF_T_MSB);
1361         size = (compr_img->index_table[block + 1] & ~OFF_T_MSB) - start_byte;
1362         if (size > sizeof(compr_img->buff_compressed)) {
1363                 SysPrintf("block %d is too large: %u\n", block, size);
1364                 return -1;
1365         }
1366
1367         if (fread(is_compressed ? compr_img->buff_compressed : compr_img->buff_raw[0],
1368                                 1, size, cdHandle) != size) {
1369                 SysPrintf("read error for block %d at %x: ", block, start_byte);
1370                 perror(NULL);
1371                 return -1;
1372         }
1373
1374         if (is_compressed) {
1375                 cdbuffer_size_expect = sizeof(compr_img->buff_raw[0]) << compr_img->block_shift;
1376                 cdbuffer_size = cdbuffer_size_expect;
1377                 ret = uncompress2_pcsx(compr_img->buff_raw[0], &cdbuffer_size, compr_img->buff_compressed, size);
1378                 if (ret != 0) {
1379                         SysPrintf("uncompress failed with %d for block %d, sector %d\n",
1380                                         ret, block, sector);
1381                         return -1;
1382                 }
1383                 if (cdbuffer_size != cdbuffer_size_expect)
1384                         SysPrintf("cdbuffer_size: %lu != %lu, sector %d\n", cdbuffer_size,
1385                                         cdbuffer_size_expect, sector);
1386         }
1387
1388         // done at last!
1389         compr_img->current_block = block;
1390
1391 finish:
1392         if (dest != cdbuffer) // copy avoid HACK
1393                 memcpy(dest, compr_img->buff_raw[compr_img->sector_in_blk],
1394                         CD_FRAMESIZE_RAW);
1395         return CD_FRAMESIZE_RAW;
1396 }
1397
1398 #ifdef HAVE_CHD
1399 static int cdread_chd(FILE *f, unsigned int base, void *dest, int sector)
1400 {
1401         int hunk;
1402
1403         if (base)
1404                 sector += base;
1405
1406         hunk = sector / chd_img->sectors_per_hunk;
1407         chd_img->sector_in_hunk = sector % chd_img->sectors_per_hunk;
1408
1409         if (hunk != chd_img->current_hunk)
1410         {
1411                 chd_read(chd_img->chd, hunk, chd_img->buffer);
1412                 chd_img->current_hunk = hunk;
1413         }
1414
1415         if (dest != cdbuffer) // copy avoid HACK
1416                 memcpy(dest, chd_img->buffer[chd_img->sector_in_hunk],
1417                         CD_FRAMESIZE_RAW);
1418         if (subChanMixed) {
1419                 memcpy(subbuffer, chd_img->buffer[chd_img->sector_in_hunk] + CD_FRAMESIZE_RAW,
1420                         SUB_FRAMESIZE);
1421                 if (subChanRaw)
1422                         DecodeRawSubData();
1423         }
1424         return CD_FRAMESIZE_RAW;
1425 }
1426 #endif
1427 static int cdread_2048(FILE *f, unsigned int base, void *dest, int sector)
1428 {
1429         int ret;
1430
1431         fseek(f, base + sector * 2048, SEEK_SET);
1432         ret = fread((char *)dest + 12 * 2, 1, 2048, f);
1433
1434         // not really necessary, fake mode 2 header
1435         memset(cdbuffer, 0, 12 * 2);
1436         sec2msf(sector + 2 * 75, (char *)&cdbuffer[12]);
1437         cdbuffer[12 + 3] = 1;
1438
1439         return ret;
1440 }
1441
1442 #ifndef _WIN32
1443
1444 static int cdread_async(FILE *f, unsigned int base, void *dest, int sector) {
1445   boolean found = FALSE;
1446   int i = sector % SECTOR_BUFFER_SIZE;
1447   long ret;
1448
1449   if (f != cdHandle || base != 0 || dest != cdbuffer) {
1450     // Async reads are only supported for cdbuffer, so call the sync
1451     // function directly.
1452     return sync_cdimg_read_func(f, base, dest, sector);
1453   }
1454
1455   pthread_mutex_lock(&read_thread_msg_lock);
1456
1457   // Only wait if we're not trying to read the next sector and
1458   // sector_start is set (meaning the last request hasn't been
1459   // processed yet)
1460   while(read_thread_sector_start != -1 && read_thread_sector_end + 1 != sector) {
1461     pthread_cond_wait(&read_thread_msg_done, &read_thread_msg_lock);
1462   }
1463
1464   if (read_thread_sector_start == -1)
1465     read_thread_sector_start = sector;
1466
1467   read_thread_sector_end = sector;
1468   pthread_cond_signal(&read_thread_msg_avail);
1469   pthread_mutex_unlock(&read_thread_msg_lock);
1470
1471   do {
1472     pthread_mutex_lock(&sectorbuffer_lock);
1473     if (sectorbuffer[i].sector == sector) {
1474       sectorbuffer_index = i;
1475       ret = sectorbuffer[i].ret;
1476       found = TRUE;
1477     }
1478
1479     if (!found) {
1480       pthread_cond_wait(&sectorbuffer_cond, &sectorbuffer_lock);
1481     }
1482     pthread_mutex_unlock(&sectorbuffer_lock);
1483   } while (!found);
1484
1485   return ret;
1486 }
1487
1488 #endif
1489
1490 static unsigned char * CALLBACK ISOgetBuffer_compr(void) {
1491         return compr_img->buff_raw[compr_img->sector_in_blk] + 12;
1492 }
1493
1494 #ifdef HAVE_CHD
1495 static unsigned char * CALLBACK ISOgetBuffer_chd(void) {
1496         return chd_img->buffer[chd_img->sector_in_hunk] + 12;
1497 }
1498 #endif
1499
1500 #ifndef _WIN32
1501 static unsigned char * CALLBACK ISOgetBuffer_async(void) {
1502   unsigned char *buffer;
1503   pthread_mutex_lock(&sectorbuffer_lock);
1504   buffer = sectorbuffer[sectorbuffer_index].data;
1505   pthread_mutex_unlock(&sectorbuffer_lock);
1506   return buffer + 12;
1507 }
1508
1509 #endif
1510
1511 static unsigned char * CALLBACK ISOgetBuffer(void) {
1512         return cdbuffer + 12;
1513 }
1514
1515 static void PrintTracks(void) {
1516         int i;
1517
1518         for (i = 1; i <= numtracks; i++) {
1519                 SysPrintf(_("Track %.2d (%s) - Start %.2d:%.2d:%.2d, Length %.2d:%.2d:%.2d\n"),
1520                         i, (ti[i].type == DATA ? "DATA" : "AUDIO"),
1521                         ti[i].start[0], ti[i].start[1], ti[i].start[2],
1522                         ti[i].length[0], ti[i].length[1], ti[i].length[2]);
1523         }
1524 }
1525
1526 // This function is invoked by the front-end when opening an ISO
1527 // file for playback
1528 static long CALLBACK ISOopen(void) {
1529         boolean isMode1ISO = FALSE;
1530         char alt_bin_filename[MAXPATHLEN];
1531         const char *bin_filename;
1532         char image_str[1024];
1533         int is_chd = 0;
1534
1535         if (cdHandle != NULL) {
1536                 return 0; // it's already open
1537         }
1538
1539         cdHandle = fopen(GetIsoFile(), "rb");
1540         if (cdHandle == NULL) {
1541                 SysPrintf(_("Could't open '%s' for reading: %s\n"),
1542                         GetIsoFile(), strerror(errno));
1543                 return -1;
1544         }
1545
1546         snprintf(image_str, sizeof(image_str) - 6*4 - 1,
1547                 "Loaded CD Image: %s", GetIsoFile());
1548
1549         cddaBigEndian = FALSE;
1550         subChanMixed = FALSE;
1551         subChanRaw = FALSE;
1552         pregapOffset = 0;
1553         cdrIsoMultidiskCount = 1;
1554         multifile = 0;
1555
1556         CDR_getBuffer = ISOgetBuffer;
1557         cdimg_read_func = cdread_normal;
1558
1559         if (parsetoc(GetIsoFile()) == 0) {
1560                 strcat(image_str, "[+toc]");
1561         }
1562         else if (parseccd(GetIsoFile()) == 0) {
1563                 strcat(image_str, "[+ccd]");
1564         }
1565         else if (parsemds(GetIsoFile()) == 0) {
1566                 strcat(image_str, "[+mds]");
1567         }
1568         else if (parsecue(GetIsoFile()) == 0) {
1569                 strcat(image_str, "[+cue]");
1570         }
1571         if (handlepbp(GetIsoFile()) == 0) {
1572                 strcat(image_str, "[+pbp]");
1573                 CDR_getBuffer = ISOgetBuffer_compr;
1574                 cdimg_read_func = cdread_compressed;
1575         }
1576         else if (handlecbin(GetIsoFile()) == 0) {
1577                 strcat(image_str, "[+cbin]");
1578                 CDR_getBuffer = ISOgetBuffer_compr;
1579                 cdimg_read_func = cdread_compressed;
1580         }
1581 #ifdef HAVE_CHD
1582         else if (handlechd(GetIsoFile()) == 0) {
1583                 strcat(image_str, "[+chd]");
1584                 CDR_getBuffer = ISOgetBuffer_chd;
1585                 cdimg_read_func = cdread_chd;
1586                 is_chd = 1;
1587         }
1588 #endif
1589
1590         if (!subChanMixed && opensubfile(GetIsoFile()) == 0) {
1591                 strcat(image_str, "[+sub]");
1592         }
1593         if (opensbifile(GetIsoFile()) == 0) {
1594                 strcat(image_str, "[+sbi]");
1595         }
1596
1597         fseeko(cdHandle, 0, SEEK_END);
1598
1599         // maybe user selected metadata file instead of main .bin ..
1600         bin_filename = GetIsoFile();
1601         if (ftello(cdHandle) < 2352 * 0x10) {
1602                 static const char *exts[] = { ".bin", ".BIN", ".img", ".IMG" };
1603                 FILE *tmpf = NULL;
1604                 size_t i;
1605                 char *p;
1606
1607                 strncpy(alt_bin_filename, bin_filename, sizeof(alt_bin_filename));
1608                 alt_bin_filename[MAXPATHLEN - 1] = '\0';
1609                 if (strlen(alt_bin_filename) >= 4) {
1610                         p = alt_bin_filename + strlen(alt_bin_filename) - 4;
1611                         for (i = 0; i < sizeof(exts) / sizeof(exts[0]); i++) {
1612                                 strcpy(p, exts[i]);
1613                                 tmpf = fopen(alt_bin_filename, "rb");
1614                                 if (tmpf != NULL)
1615                                         break;
1616                         }
1617                 }
1618                 if (tmpf != NULL) {
1619                         bin_filename = alt_bin_filename;
1620                         fclose(cdHandle);
1621                         cdHandle = tmpf;
1622                         fseeko(cdHandle, 0, SEEK_END);
1623                 }
1624         }
1625
1626         // guess whether it is mode1/2048
1627         if (ftello(cdHandle) % 2048 == 0) {
1628                 unsigned int modeTest = 0;
1629                 fseek(cdHandle, 0, SEEK_SET);
1630                 if (!fread(&modeTest, sizeof(modeTest), 1, cdHandle)) {
1631 #ifndef NDEBUG
1632                         SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
1633 #endif
1634                         return -1;
1635                 }
1636                 if (SWAP32(modeTest) != 0xffffff00) {
1637                         strcat(image_str, "[2048]");
1638                         isMode1ISO = TRUE;
1639                 }
1640         }
1641         fseek(cdHandle, 0, SEEK_SET);
1642
1643         SysPrintf("%s.\n", image_str);
1644
1645         PrintTracks();
1646
1647         if (subChanMixed && !is_chd)
1648                 cdimg_read_func = cdread_sub_mixed;
1649         else if (isMode1ISO)
1650                 cdimg_read_func = cdread_2048;
1651
1652         // make sure we have another handle open for cdda
1653         if (numtracks > 1 && ti[1].handle == NULL) {
1654                 ti[1].handle = fopen(bin_filename, "rb");
1655         }
1656         cdda_cur_sector = 0;
1657         cdda_file_offset = 0;
1658
1659   if (Config.AsyncCD) {
1660     readThreadStart();
1661   }
1662         return 0;
1663 }
1664
1665 static long CALLBACK ISOclose(void) {
1666         int i;
1667
1668         if (cdHandle != NULL) {
1669                 fclose(cdHandle);
1670                 cdHandle = NULL;
1671         }
1672         if (subHandle != NULL) {
1673                 fclose(subHandle);
1674                 subHandle = NULL;
1675         }
1676         playing = FALSE;
1677         cddaHandle = NULL;
1678
1679         if (compr_img != NULL) {
1680                 free(compr_img->index_table);
1681                 free(compr_img);
1682                 compr_img = NULL;
1683         }
1684
1685 #ifdef HAVE_CHD
1686         if (chd_img != NULL) {
1687                 chd_close(chd_img->chd);
1688                 free(chd_img->buffer);
1689                 free(chd_img);
1690                 chd_img = NULL;
1691         }
1692 #endif
1693
1694         for (i = 1; i <= numtracks; i++) {
1695                 if (ti[i].handle != NULL) {
1696                         fclose(ti[i].handle);
1697                         ti[i].handle = NULL;
1698                 }
1699         }
1700         numtracks = 0;
1701         ti[1].type = 0;
1702         UnloadSBI();
1703
1704         memset(cdbuffer, 0, sizeof(cdbuffer));
1705         CDR_getBuffer = ISOgetBuffer;
1706
1707         if (Config.AsyncCD) {
1708                 readThreadStop();
1709         }
1710
1711         return 0;
1712 }
1713
1714 static long CALLBACK ISOinit(void) {
1715         assert(cdHandle == NULL);
1716         assert(subHandle == NULL);
1717
1718         return 0; // do nothing
1719 }
1720
1721 static long CALLBACK ISOshutdown(void) {
1722         ISOclose();
1723         return 0;
1724 }
1725
1726 // return Starting and Ending Track
1727 // buffer:
1728 //  byte 0 - start track
1729 //  byte 1 - end track
1730 static long CALLBACK ISOgetTN(unsigned char *buffer) {
1731         buffer[0] = 1;
1732
1733         if (numtracks > 0) {
1734                 buffer[1] = numtracks;
1735         }
1736         else {
1737                 buffer[1] = 1;
1738         }
1739
1740         return 0;
1741 }
1742
1743 // return Track Time
1744 // buffer:
1745 //  byte 0 - frame
1746 //  byte 1 - second
1747 //  byte 2 - minute
1748 static long CALLBACK ISOgetTD(unsigned char track, unsigned char *buffer) {
1749         if (track == 0) {
1750                 unsigned int sect;
1751                 unsigned char time[3];
1752                 sect = msf2sec(ti[numtracks].start) + msf2sec(ti[numtracks].length);
1753                 sec2msf(sect, (char *)time);
1754                 buffer[2] = time[0];
1755                 buffer[1] = time[1];
1756                 buffer[0] = time[2];
1757         }
1758         else if (numtracks > 0 && track <= numtracks) {
1759                 buffer[2] = ti[track].start[0];
1760                 buffer[1] = ti[track].start[1];
1761                 buffer[0] = ti[track].start[2];
1762         }
1763         else {
1764                 buffer[2] = 0;
1765                 buffer[1] = 2;
1766                 buffer[0] = 0;
1767         }
1768
1769         return 0;
1770 }
1771
1772 // decode 'raw' subchannel data ripped by cdrdao
1773 static void DecodeRawSubData(void) {
1774         unsigned char subQData[12];
1775         int i;
1776
1777         memset(subQData, 0, sizeof(subQData));
1778
1779         for (i = 0; i < 8 * 12; i++) {
1780                 if (subbuffer[i] & (1 << 6)) { // only subchannel Q is needed
1781                         subQData[i >> 3] |= (1 << (7 - (i & 7)));
1782                 }
1783         }
1784
1785         memcpy(&subbuffer[12], subQData, 12);
1786 }
1787
1788 // read track
1789 // time: byte 0 - minute; byte 1 - second; byte 2 - frame
1790 // uses bcd format
1791 static boolean CALLBACK ISOreadTrack(unsigned char *time) {
1792         int sector = MSF2SECT(btoi(time[0]), btoi(time[1]), btoi(time[2]));
1793         long ret;
1794
1795         if (cdHandle == NULL) {
1796                 return 0;
1797         }
1798
1799         if (pregapOffset) {
1800                 subChanMissing = FALSE;
1801                 if (sector >= pregapOffset) {
1802                         sector -= 2 * 75;
1803                         if (sector < pregapOffset)
1804                                 subChanMissing = TRUE;
1805                 }
1806         }
1807
1808         ret = cdimg_read_func(cdHandle, 0, cdbuffer, sector);
1809         if (ret < 0)
1810                 return 0;
1811
1812         if (subHandle != NULL) {
1813                 fseek(subHandle, sector * SUB_FRAMESIZE, SEEK_SET);
1814                 if (fread(subbuffer, 1, SUB_FRAMESIZE, subHandle) != SUB_FRAMESIZE)
1815                         /* Faulty subchannel data shouldn't cause a read failure */
1816                         return 0;
1817
1818                 if (subChanRaw) DecodeRawSubData();
1819         }
1820
1821         return 1;
1822 }
1823
1824 // plays cdda audio
1825 // sector: byte 0 - minute; byte 1 - second; byte 2 - frame
1826 // does NOT uses bcd format
1827 static long CALLBACK ISOplay(void) {
1828         playing = TRUE;
1829         return 0;
1830 }
1831
1832 // stops cdda audio
1833 static long CALLBACK ISOstop(void) {
1834         playing = FALSE;
1835         return 0;
1836 }
1837
1838 // gets subchannel data
1839 static unsigned char* CALLBACK ISOgetBufferSub(void) {
1840         if ((subHandle != NULL || subChanMixed) && !subChanMissing) {
1841                 return subbuffer;
1842         }
1843
1844         return NULL;
1845 }
1846
1847 static long CALLBACK ISOgetStatus(struct CdrStat *stat) {
1848         u32 sect;
1849
1850         CDR__getStatus(stat);
1851
1852         if (playing) {
1853                 stat->Type = 0x02;
1854                 stat->Status |= 0x80;
1855         }
1856         else {
1857                 // BIOS - boot ID (CD type)
1858                 stat->Type = ti[1].type;
1859         }
1860
1861         // relative -> absolute time
1862         sect = cddaCurPos;
1863         sec2msf(sect, (char *)stat->Time);
1864
1865         return 0;
1866 }
1867
1868 // read CDDA sector into buffer
1869 long CALLBACK ISOreadCDDA(unsigned char m, unsigned char s, unsigned char f, unsigned char *buffer) {
1870         unsigned char msf[3] = {m, s, f};
1871         unsigned int file, track, track_start = 0;
1872         int ret;
1873
1874         cddaCurPos = msf2sec((char *)msf);
1875
1876         // find current track index
1877         for (track = numtracks; ; track--) {
1878                 track_start = msf2sec(ti[track].start);
1879                 if (track_start <= cddaCurPos)
1880                         break;
1881                 if (track == 1)
1882                         break;
1883         }
1884
1885         // data tracks play silent
1886         if (ti[track].type != CDDA) {
1887                 memset(buffer, 0, CD_FRAMESIZE_RAW);
1888                 return 0;
1889         }
1890
1891         file = 1;
1892         if (multifile) {
1893                 // find the file that contains this track
1894                 for (file = track; file > 1; file--)
1895                         if (ti[file].handle != NULL)
1896                                 break;
1897         }
1898
1899         ret = cdimg_read_func(ti[file].handle, ti[track].start_offset,
1900                 buffer, cddaCurPos - track_start);
1901         if (ret != CD_FRAMESIZE_RAW) {
1902                 memset(buffer, 0, CD_FRAMESIZE_RAW);
1903                 return -1;
1904         }
1905
1906         if (cddaBigEndian) {
1907                 int i;
1908                 unsigned char tmp;
1909
1910                 for (i = 0; i < CD_FRAMESIZE_RAW / 2; i++) {
1911                         tmp = buffer[i * 2];
1912                         buffer[i * 2] = buffer[i * 2 + 1];
1913                         buffer[i * 2 + 1] = tmp;
1914                 }
1915         }
1916
1917         return 0;
1918 }
1919
1920 void cdrIsoInit(void) {
1921         CDR_init = ISOinit;
1922         CDR_shutdown = ISOshutdown;
1923         CDR_open = ISOopen;
1924         CDR_close = ISOclose;
1925         CDR_getTN = ISOgetTN;
1926         CDR_getTD = ISOgetTD;
1927         CDR_readTrack = ISOreadTrack;
1928         CDR_getBuffer = ISOgetBuffer;
1929         CDR_play = ISOplay;
1930         CDR_stop = ISOstop;
1931         CDR_getBufferSub = ISOgetBufferSub;
1932         CDR_getStatus = ISOgetStatus;
1933         CDR_readCDDA = ISOreadCDDA;
1934
1935         CDR_getDriveLetter = CDR__getDriveLetter;
1936         CDR_configure = CDR__configure;
1937         CDR_test = CDR__test;
1938         CDR_about = CDR__about;
1939         CDR_setfilename = CDR__setfilename;
1940
1941         numtracks = 0;
1942 }
1943
1944 int cdrIsoActive(void) {
1945         return (cdHandle != NULL);
1946 }