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         const char *ext = NULL;
 689         int i, ret;
 690
 691         if (strlen(isofile) >= 4)
 692                 ext = isofile + strlen(isofile) - 4;
 693         if (ext == NULL || (strcmp(ext, ".pbp") != 0 && strcmp(ext, ".PBP") != 0))
 694                 return -1;
 695
 696         fseeko(cdHandle, 0, SEEK_SET);
 697
 698         numtracks = 0;
 699
 700         ret = fread(&pbp_hdr, 1, sizeof(pbp_hdr), cdHandle);
 701         if (ret != sizeof(pbp_hdr)) {
 702                 SysPrintf("failed to read pbp\n");
 703                 goto fail_io;
 704         }
 705
 706         ret = fseeko(cdHandle, pbp_hdr.psar_offs, SEEK_SET);
 707         if (ret != 0) {
 708                 SysPrintf("failed to seek to %x\n", pbp_hdr.psar_offs);
 709                 goto fail_io;
 710         }
 711
 712         psisoimg_offs = pbp_hdr.psar_offs;
 713         if (fread(psar_sig, 1, sizeof(psar_sig), cdHandle) != sizeof(psar_sig))
 714                 goto fail_io;
 715         psar_sig[10] = 0;
 716         if (strcmp(psar_sig, "PSTITLEIMG") == 0) {
 717                 // multidisk image?
 718                 ret = fseeko(cdHandle, pbp_hdr.psar_offs + 0x200, SEEK_SET);
 719                 if (ret != 0) {
 720                         SysPrintf("failed to seek to %x\n", pbp_hdr.psar_offs + 0x200);
 721                         goto fail_io;
 722                 }
 723
 724                 if (fread(&offsettab, 1, sizeof(offsettab), cdHandle) != sizeof(offsettab)) {
 725                         SysPrintf("failed to read offsettab\n");
 726                         goto fail_io;
 727                 }
 728
 729                 for (i = 0; i < sizeof(offsettab) / sizeof(offsettab[0]); i++) {
 730                         if (offsettab[i] == 0)
 731                                 break;
 732                 }
 733                 cdrIsoMultidiskCount = i;
 734                 if (cdrIsoMultidiskCount == 0) {
 735                         SysPrintf("multidisk eboot has 0 images?\n");
 736                         goto fail_io;
 737                 }
 738
 739                 if (cdrIsoMultidiskSelect >= cdrIsoMultidiskCount)
 740                         cdrIsoMultidiskSelect = 0;
 741
 742                 psisoimg_offs += offsettab[cdrIsoMultidiskSelect];
 743
 744                 ret = fseeko(cdHandle, psisoimg_offs, SEEK_SET);
 745                 if (ret != 0) {
 746                         SysPrintf("failed to seek to %llx\n", (long long)psisoimg_offs);
 747                         goto fail_io;
 748                 }
 749
 750                 if (fread(psar_sig, 1, sizeof(psar_sig), cdHandle) != sizeof(psar_sig))
 751                         goto fail_io;
 752                 psar_sig[10] = 0;
 753         }
 754
 755         if (strcmp(psar_sig, "PSISOIMG00") != 0) {
 756                 SysPrintf("bad psar_sig: %s\n", psar_sig);
 757                 goto fail_io;
 758         }
 759
 760         // seek to TOC
 761         ret = fseeko(cdHandle, psisoimg_offs + 0x800, SEEK_SET);
 762         if (ret != 0) {
 763                 SysPrintf("failed to seek to %llx\n", (long long)psisoimg_offs + 0x800);
 764                 goto fail_io;
 765         }
 766
 767         // first 3 entries are special
 768         fseek(cdHandle, sizeof(toc_entry), SEEK_CUR);
 769         if (fread(&toc_entry, 1, sizeof(toc_entry), cdHandle) != sizeof(toc_entry))
 770                 goto fail_io;
 771         numtracks = btoi(toc_entry.index1[0]);
 772
 773         if (fread(&toc_entry, 1, sizeof(toc_entry), cdHandle) != sizeof(toc_entry))
 774                 goto fail_io;
 775         cd_length = btoi(toc_entry.index1[0]) * 60 * 75 +
 776                 btoi(toc_entry.index1[1]) * 75 + btoi(toc_entry.index1[2]);
 777
 778         for (i = 1; i <= numtracks; i++) {
 779                 if (fread(&toc_entry, 1, sizeof(toc_entry), cdHandle) != sizeof(toc_entry))
 780                         goto fail_io;
 781
 782                 ti[i].type = (toc_entry.type == 1) ? CDDA : DATA;
 783
 784                 ti[i].start_offset = btoi(toc_entry.index0[0]) * 60 * 75 +
 785                         btoi(toc_entry.index0[1]) * 75 + btoi(toc_entry.index0[2]);
 786                 ti[i].start_offset *= 2352;
 787                 ti[i].start[0] = btoi(toc_entry.index1[0]);
 788                 ti[i].start[1] = btoi(toc_entry.index1[1]);
 789                 ti[i].start[2] = btoi(toc_entry.index1[2]);
 790
 791                 if (i > 1) {
 792                         t = msf2sec(ti[i].start) - msf2sec(ti[i - 1].start);
 793                         sec2msf(t, ti[i - 1].length);
 794                 }
 795         }
 796         t = cd_length - ti[numtracks].start_offset / 2352;
 797         sec2msf(t, ti[numtracks].length);
 798
 799         // seek to ISO index
 800         ret = fseeko(cdHandle, psisoimg_offs + 0x4000, SEEK_SET);
 801         if (ret != 0) {
 802                 SysPrintf("failed to seek to ISO index\n");
 803                 goto fail_io;
 804         }
 805
 806         compr_img = calloc(1, sizeof(*compr_img));
 807         if (compr_img == NULL)
 808                 goto fail_io;
 809
 810         compr_img->block_shift = 4;
 811         compr_img->current_block = (unsigned int)-1;
 812
 813         compr_img->index_len = (0x100000 - 0x4000) / sizeof(index_entry);
 814         compr_img->index_table = malloc((compr_img->index_len + 1) * sizeof(compr_img->index_table[0]));
 815         if (compr_img->index_table == NULL)
 816                 goto fail_io;
 817
 818         cdimg_base = psisoimg_offs + 0x100000;
 819         for (i = 0; i < compr_img->index_len; i++) {
 820                 ret = fread(&index_entry, 1, sizeof(index_entry), cdHandle);
 821                 if (ret != sizeof(index_entry)) {
 822                         SysPrintf("failed to read index_entry #%d\n", i);
 823                         goto fail_index;
 824                 }
 825
 826                 if (index_entry.size == 0)
 827                         break;
 828
 829                 compr_img->index_table[i] = cdimg_base + index_entry.offset;
 830         }
 831         compr_img->index_table[i] = cdimg_base + index_entry.offset + index_entry.size;
 832
 833         return 0;
 834
 835 fail_index:
 836         free(compr_img->index_table);
 837         compr_img->index_table = NULL;
 838         goto done;
 839
 840 fail_io:
 841 #ifndef NDEBUG
 842         SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
 843 #endif
 844
 845 done:
 846         if (compr_img != NULL) {
 847                 free(compr_img);
 848                 compr_img = NULL;
 849         }
 850         return -1;
 851 }
 852
 853 static int handlecbin(const char *isofile) {
 854         struct
 855         {
 856                 char magic[4];
 857                 unsigned int header_size;
 858                 unsigned long long total_bytes;
 859                 unsigned int block_size;
 860                 unsigned char ver;              // 1
 861                 unsigned char align;
 862                 unsigned char rsv_06[2];
 863         } ciso_hdr;
 864         const char *ext = NULL;
 865         unsigned int *index_table = NULL;
 866         unsigned int index = 0, plain;
 867         int i, ret;
 868
 869         if (strlen(isofile) >= 5)
 870                 ext = isofile + strlen(isofile) - 5;
 871         if (ext == NULL || (strcasecmp(ext + 1, ".cbn") != 0 && strcasecmp(ext, ".cbin") != 0))
 872                 return -1;
 873
 874         fseek(cdHandle, 0, SEEK_SET);
 875
 876         ret = fread(&ciso_hdr, 1, sizeof(ciso_hdr), cdHandle);
 877         if (ret != sizeof(ciso_hdr)) {
 878                 SysPrintf("failed to read ciso header\n");
 879                 return -1;
 880         }
 881
 882         if (strncmp(ciso_hdr.magic, "CISO", 4) != 0 || ciso_hdr.total_bytes <= 0 || ciso_hdr.block_size <= 0) {
 883                 SysPrintf("bad ciso header\n");
 884                 return -1;
 885         }
 886         if (ciso_hdr.header_size != 0 && ciso_hdr.header_size != sizeof(ciso_hdr)) {
 887                 ret = fseeko(cdHandle, ciso_hdr.header_size, SEEK_SET);
 888                 if (ret != 0) {
 889                         SysPrintf("failed to seek to %x\n", ciso_hdr.header_size);
 890                         return -1;
 891                 }
 892         }
 893
 894         compr_img = calloc(1, sizeof(*compr_img));
 895         if (compr_img == NULL)
 896                 goto fail_io;
 897
 898         compr_img->block_shift = 0;
 899         compr_img->current_block = (unsigned int)-1;
 900
 901         compr_img->index_len = ciso_hdr.total_bytes / ciso_hdr.block_size;
 902         index_table = malloc((compr_img->index_len + 1) * sizeof(index_table[0]));
 903         if (index_table == NULL)
 904                 goto fail_io;
 905
 906         ret = fread(index_table, sizeof(index_table[0]), compr_img->index_len, cdHandle);
 907         if (ret != compr_img->index_len) {
 908                 SysPrintf("failed to read index table\n");
 909                 goto fail_index;
 910         }
 911
 912         compr_img->index_table = malloc((compr_img->index_len + 1) * sizeof(compr_img->index_table[0]));
 913         if (compr_img->index_table == NULL)
 914                 goto fail_index;
 915
 916         for (i = 0; i < compr_img->index_len + 1; i++) {
 917                 index = index_table[i];
 918                 plain = index & 0x80000000;
 919                 index &= 0x7fffffff;
 920                 compr_img->index_table[i] = (off_t)index << ciso_hdr.align;
 921                 if (plain)
 922                         compr_img->index_table[i] |= OFF_T_MSB;
 923         }
 924
 925         return 0;
 926
 927 fail_index:
 928         free(index_table);
 929 fail_io:
 930         if (compr_img != NULL) {
 931                 free(compr_img);
 932                 compr_img = NULL;
 933         }
 934         return -1;
 935 }
 936
 937 #ifdef HAVE_CHD
 938 static int handlechd(const char *isofile) {
 939         chd_img = calloc(1, sizeof(*chd_img));
 940         if (chd_img == NULL)
 941                 goto fail_io;
 942
 943         if(chd_open(isofile, CHD_OPEN_READ, NULL, &chd_img->chd) != CHDERR_NONE)
 944                 goto fail_io;
 945
 946         if (Config.CHD_Precache && (chd_precache(chd_img->chd) != CHDERR_NONE))
 947                 goto fail_io;
 948
 949    chd_img->header = chd_get_header(chd_img->chd);
 950
 951    chd_img->buffer = malloc(chd_img->header->hunkbytes);
 952    if (chd_img->buffer == NULL)
 953                 goto fail_io;
 954
 955    chd_img->sectors_per_hunk = chd_img->header->hunkbytes / (CD_FRAMESIZE_RAW + SUB_FRAMESIZE);
 956    chd_img->current_hunk = (unsigned int)-1;
 957
 958    cddaBigEndian = TRUE;
 959
 960         numtracks = 0;
 961         int frame_offset = 0;
 962         int file_offset = 0;
 963         memset(ti, 0, sizeof(ti));
 964
 965    while (1)
 966    {
 967       struct {
 968          char type[64];
 969          char subtype[32];
 970          char pgtype[32];
 971          char pgsub[32];
 972          uint32_t track;
 973          uint32_t frames;
 974          uint32_t pregap;
 975          uint32_t postgap;
 976       } md = {};
 977       char meta[256];
 978       uint32_t meta_size = 0;
 979
 980       if (chd_get_metadata(chd_img->chd, CDROM_TRACK_METADATA2_TAG, numtracks, meta, sizeof(meta), &meta_size, NULL, NULL) == CHDERR_NONE)
 981          sscanf(meta, CDROM_TRACK_METADATA2_FORMAT, &md.track, md.type, md.subtype, &md.frames, &md.pregap, md.pgtype, md.pgsub, &md.postgap);
 982       else if (chd_get_metadata(chd_img->chd, CDROM_TRACK_METADATA_TAG, numtracks, meta, sizeof(meta), &meta_size, NULL, NULL) == CHDERR_NONE)
 983          sscanf(meta, CDROM_TRACK_METADATA_FORMAT, &md.track, md.type, md.subtype, &md.frames);
 984       else
 985          break;
 986
 987                 SysPrintf("chd: %s\n", meta);
 988
 989                 if (md.track == 1) {
 990                         md.pregap = 150;
 991                         if (!strncmp(md.subtype, "RW", 2)) {
 992                                 subChanMixed = TRUE;
 993                                 if (!strcmp(md.subtype, "RW_RAW"))
 994                                         subChanRaw = TRUE;
 995                         }
 996                 }
 997                 else
 998                         sec2msf(msf2sec(ti[md.track-1].length) + md.pregap, ti[md.track-1].length);
 999
1000                 ti[md.track].type = !strncmp(md.type, "AUDIO", 5) ? CDDA : DATA;
1001
1002                 sec2msf(frame_offset + md.pregap, ti[md.track].start);
1003                 sec2msf(md.frames, ti[md.track].length);
1004
1005                 ti[md.track].start_offset = file_offset;
1006
1007                 frame_offset += md.pregap + md.frames + md.postgap;
1008                 file_offset += md.frames + md.postgap;
1009                 numtracks++;
1010         }
1011
1012         if (numtracks)
1013                 return 0;
1014
1015 fail_io:
1016         if (chd_img != NULL) {
1017                 free(chd_img->buffer);
1018                 free(chd_img);
1019                 chd_img = NULL;
1020         }
1021         return -1;
1022 }
1023 #endif
1024
1025 // this function tries to get the .sub file of the given .img
1026 static int opensubfile(const char *isoname) {
1027         char            subname[MAXPATHLEN];
1028
1029         // copy name of the iso and change extension from .img to .sub
1030         strncpy(subname, isoname, sizeof(subname));
1031         subname[MAXPATHLEN - 1] = '\0';
1032         if (strlen(subname) >= 4) {
1033                 strcpy(subname + strlen(subname) - 4, ".sub");
1034         }
1035         else {
1036                 return -1;
1037         }
1038
1039         subHandle = fopen(subname, "rb");
1040         if (subHandle == NULL) {
1041                 return -1;
1042         }
1043
1044         return 0;
1045 }
1046
1047 static int opensbifile(const char *isoname) {
1048         char            sbiname[MAXPATHLEN], disknum[MAXPATHLEN] = "0";
1049         int             s;
1050
1051         strncpy(sbiname, isoname, sizeof(sbiname));
1052         sbiname[MAXPATHLEN - 1] = '\0';
1053         if (strlen(sbiname) >= 4) {
1054                 if (cdrIsoMultidiskCount > 1) {
1055                         sprintf(disknum, "_%i.sbi", cdrIsoMultidiskSelect + 1);
1056                         strcpy(sbiname + strlen(sbiname) - 4, disknum);
1057                 }
1058                 else
1059                         strcpy(sbiname + strlen(sbiname) - 4, ".sbi");
1060         }
1061         else {
1062                 return -1;
1063         }
1064
1065         fseek(cdHandle, 0, SEEK_END);
1066         s = ftell(cdHandle) / 2352;
1067
1068         return LoadSBI(sbiname, s);
1069 }
1070
1071 #ifdef _WIN32
1072 static void readThreadStop() {}
1073 static void readThreadStart() {}
1074 #else
1075 static pthread_t read_thread_id;
1076
1077 static pthread_cond_t read_thread_msg_avail;
1078 static pthread_cond_t read_thread_msg_done;
1079 static pthread_mutex_t read_thread_msg_lock;
1080
1081 static pthread_cond_t sectorbuffer_cond;
1082 static pthread_mutex_t sectorbuffer_lock;
1083
1084 static boolean read_thread_running = FALSE;
1085 static int read_thread_sector_start = -1;
1086 static int read_thread_sector_end = -1;
1087
1088 typedef struct {
1089   int sector;
1090   long ret;
1091   unsigned char data[CD_FRAMESIZE_RAW];
1092 } SectorBufferEntry;
1093
1094 #define SECTOR_BUFFER_SIZE 4096
1095
1096 static SectorBufferEntry *sectorbuffer;
1097 static size_t sectorbuffer_index;
1098
1099 int (*sync_cdimg_read_func)(FILE *f, unsigned int base, void *dest, int sector);
1100 unsigned char *(*sync_CDR_getBuffer)(void);
1101
1102 static unsigned char * CALLBACK ISOgetBuffer_async(void);
1103 static int cdread_async(FILE *f, unsigned int base, void *dest, int sector);
1104
1105 static void *readThreadMain(void *param) {
1106   int max_sector = -1;
1107   int requested_sector_start = -1;
1108   int requested_sector_end = -1;
1109   int last_read_sector = -1;
1110   int index = 0;
1111
1112   int ra_sector = -1;
1113   int max_ra = 128;
1114   int initial_ra = 1;
1115   int speedmult_ra = 4;
1116
1117   int ra_count = 0;
1118   int how_far_ahead = 0;
1119
1120   unsigned char tmpdata[CD_FRAMESIZE_RAW];
1121   long ret;
1122
1123   max_sector = msf2sec(ti[numtracks].start) + msf2sec(ti[numtracks].length);
1124
1125   while(1) {
1126     pthread_mutex_lock(&read_thread_msg_lock);
1127
1128     // If we don't have readahead and we don't have a sector request, wait for one.
1129     // If we still have readahead to go, don't block, just keep going.
1130     // And if we ever have a sector request pending, acknowledge and reset it.
1131
1132     if (!ra_count) {
1133       if (read_thread_sector_start == -1 && read_thread_running) {
1134         pthread_cond_wait(&read_thread_msg_avail, &read_thread_msg_lock);
1135       }
1136     }
1137
1138     if (read_thread_sector_start != -1) {
1139       requested_sector_start = read_thread_sector_start;
1140       requested_sector_end = read_thread_sector_end;
1141       read_thread_sector_start = -1;
1142       read_thread_sector_end = -1;
1143       pthread_cond_signal(&read_thread_msg_done);
1144     }
1145
1146     pthread_mutex_unlock(&read_thread_msg_lock);
1147
1148     if (!read_thread_running)
1149       break;
1150
1151     // Readahead code, based on the implementation in mednafen psx's cdromif.cpp
1152     if (requested_sector_start != -1) {
1153       if (last_read_sector != -1 && last_read_sector == (requested_sector_start - 1)) {
1154         how_far_ahead = ra_sector - requested_sector_end;
1155
1156         if(how_far_ahead <= max_ra)
1157           ra_count = (max_ra - how_far_ahead + 1 ? max_ra - how_far_ahead + 1 : speedmult_ra);
1158         else
1159           ra_count++;
1160       } else if (requested_sector_end != last_read_sector) {
1161         ra_sector = requested_sector_end;
1162         ra_count = initial_ra;
1163       }
1164
1165       last_read_sector = requested_sector_end;
1166     }
1167
1168     index = ra_sector % SECTOR_BUFFER_SIZE;
1169
1170     // check for end of CD
1171     if (ra_count && ra_sector >= max_sector) {
1172       ra_count = 0;
1173       pthread_mutex_lock(&sectorbuffer_lock);
1174       sectorbuffer[index].ret = -1;
1175       sectorbuffer[index].sector = ra_sector;
1176       pthread_cond_signal(&sectorbuffer_cond);
1177       pthread_mutex_unlock(&sectorbuffer_lock);
1178     }
1179
1180     if (ra_count) {
1181       pthread_mutex_lock(&sectorbuffer_lock);
1182       if (sectorbuffer[index].sector != ra_sector) {
1183         pthread_mutex_unlock(&sectorbuffer_lock);
1184
1185         ret = sync_cdimg_read_func(cdHandle, 0, tmpdata, ra_sector);
1186
1187         pthread_mutex_lock(&sectorbuffer_lock);
1188         sectorbuffer[index].ret = ret;
1189         sectorbuffer[index].sector = ra_sector;
1190         memcpy(sectorbuffer[index].data, tmpdata, CD_FRAMESIZE_RAW);
1191       }
1192       pthread_cond_signal(&sectorbuffer_cond);
1193       pthread_mutex_unlock(&sectorbuffer_lock);
1194
1195       ra_sector++;
1196       ra_count--;
1197     }
1198   }
1199
1200   return NULL;
1201 }
1202
1203 static void readThreadStop() {
1204   if (read_thread_running == TRUE) {
1205     read_thread_running = FALSE;
1206     pthread_cond_signal(&read_thread_msg_avail);
1207     pthread_join(read_thread_id, NULL);
1208   }
1209
1210   pthread_cond_destroy(&read_thread_msg_done);
1211   pthread_cond_destroy(&read_thread_msg_avail);
1212   pthread_mutex_destroy(&read_thread_msg_lock);
1213
1214   pthread_cond_destroy(&sectorbuffer_cond);
1215   pthread_mutex_destroy(&sectorbuffer_lock);
1216
1217   CDR_getBuffer = sync_CDR_getBuffer;
1218   cdimg_read_func = sync_cdimg_read_func;
1219
1220   free(sectorbuffer);
1221   sectorbuffer = NULL;
1222 }
1223
1224 static void readThreadStart() {
1225   SysPrintf("Starting async CD thread\n");
1226
1227   if (read_thread_running == TRUE)
1228     return;
1229
1230   read_thread_running = TRUE;
1231   read_thread_sector_start = -1;
1232   read_thread_sector_end = -1;
1233   sectorbuffer_index = 0;
1234
1235   sectorbuffer = calloc(SECTOR_BUFFER_SIZE, sizeof(SectorBufferEntry));
1236   if(!sectorbuffer)
1237     goto error;
1238
1239   sectorbuffer[0].sector = -1; // Otherwise we might think we've already fetched sector 0!
1240
1241   sync_CDR_getBuffer = CDR_getBuffer;
1242   CDR_getBuffer = ISOgetBuffer_async;
1243   sync_cdimg_read_func = cdimg_read_func;
1244   cdimg_read_func = cdread_async;
1245
1246   if (pthread_cond_init(&read_thread_msg_avail, NULL) ||
1247       pthread_cond_init(&read_thread_msg_done, NULL) ||
1248       pthread_mutex_init(&read_thread_msg_lock, NULL) ||
1249       pthread_cond_init(&sectorbuffer_cond, NULL) ||
1250       pthread_mutex_init(&sectorbuffer_lock, NULL) ||
1251       pthread_create(&read_thread_id, NULL, readThreadMain, NULL))
1252     goto error;
1253
1254   return;
1255
1256  error:
1257   SysPrintf("Error starting async CD thread\n");
1258   SysPrintf("Falling back to sync\n");
1259
1260   readThreadStop();
1261 }
1262 #endif
1263
1264 static int cdread_normal(FILE *f, unsigned int base, void *dest, int sector)
1265 {
1266         fseek(f, base + sector * CD_FRAMESIZE_RAW, SEEK_SET);
1267         return fread(dest, 1, CD_FRAMESIZE_RAW, f);
1268 }
1269
1270 static int cdread_sub_mixed(FILE *f, unsigned int base, void *dest, int sector)
1271 {
1272         int ret;
1273
1274         fseek(f, base + sector * (CD_FRAMESIZE_RAW + SUB_FRAMESIZE), SEEK_SET);
1275         ret = fread(dest, 1, CD_FRAMESIZE_RAW, f);
1276         if (fread(subbuffer, 1, SUB_FRAMESIZE, f) != SUB_FRAMESIZE)
1277                 goto fail_io;
1278
1279         if (subChanRaw) DecodeRawSubData();
1280         goto done;
1281
1282 fail_io:
1283 #ifndef NDEBUG
1284         SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
1285 #endif
1286
1287 done:
1288         return ret;
1289 }
1290
1291 static int uncompress2_pcsx(void *out, unsigned long *out_size, void *in, unsigned long in_size)
1292 {
1293         static z_stream z;
1294         int ret = 0;
1295
1296         if (z.zalloc == NULL) {
1297                 // XXX: one-time leak here..
1298                 z.next_in = Z_NULL;
1299                 z.avail_in = 0;
1300                 z.zalloc = Z_NULL;
1301                 z.zfree = Z_NULL;
1302                 z.opaque = Z_NULL;
1303                 ret = inflateInit2(&z, -15);
1304         }
1305         else
1306                 ret = inflateReset(&z);
1307         if (ret != Z_OK)
1308                 return ret;
1309
1310         z.next_in = in;
1311         z.avail_in = in_size;
1312         z.next_out = out;
1313         z.avail_out = *out_size;
1314
1315         ret = inflate(&z, Z_NO_FLUSH);
1316         //inflateEnd(&z);
1317
1318         *out_size -= z.avail_out;
1319         return ret == 1 ? 0 : ret;
1320 }
1321
1322 static int cdread_compressed(FILE *f, unsigned int base, void *dest, int sector)
1323 {
1324         unsigned long cdbuffer_size, cdbuffer_size_expect;
1325         unsigned int size;
1326         int is_compressed;
1327         off_t start_byte;
1328         int ret, block;
1329
1330         if (base)
1331                 sector += base / 2352;
1332
1333         block = sector >> compr_img->block_shift;
1334         compr_img->sector_in_blk = sector & ((1 << compr_img->block_shift) - 1);
1335
1336         if (block == compr_img->current_block) {
1337                 //printf("hit sect %d\n", sector);
1338                 goto finish;
1339         }
1340
1341         if (sector >= compr_img->index_len * 16) {
1342                 SysPrintf("sector %d is past img end\n", sector);
1343                 return -1;
1344         }
1345
1346         start_byte = compr_img->index_table[block] & ~OFF_T_MSB;
1347         if (fseeko(cdHandle, start_byte, SEEK_SET) != 0) {
1348                 SysPrintf("seek error for block %d at %llx: ",
1349                         block, (long long)start_byte);
1350                 perror(NULL);
1351                 return -1;
1352         }
1353
1354         is_compressed = !(compr_img->index_table[block] & OFF_T_MSB);
1355         size = (compr_img->index_table[block + 1] & ~OFF_T_MSB) - start_byte;
1356         if (size > sizeof(compr_img->buff_compressed)) {
1357                 SysPrintf("block %d is too large: %u\n", block, size);
1358                 return -1;
1359         }
1360
1361         if (fread(is_compressed ? compr_img->buff_compressed : compr_img->buff_raw[0],
1362                                 1, size, cdHandle) != size) {
1363                 SysPrintf("read error for block %d at %x: ", block, start_byte);
1364                 perror(NULL);
1365                 return -1;
1366         }
1367
1368         if (is_compressed) {
1369                 cdbuffer_size_expect = sizeof(compr_img->buff_raw[0]) << compr_img->block_shift;
1370                 cdbuffer_size = cdbuffer_size_expect;
1371                 ret = uncompress2_pcsx(compr_img->buff_raw[0], &cdbuffer_size, compr_img->buff_compressed, size);
1372                 if (ret != 0) {
1373                         SysPrintf("uncompress failed with %d for block %d, sector %d\n",
1374                                         ret, block, sector);
1375                         return -1;
1376                 }
1377                 if (cdbuffer_size != cdbuffer_size_expect)
1378                         SysPrintf("cdbuffer_size: %lu != %lu, sector %d\n", cdbuffer_size,
1379                                         cdbuffer_size_expect, sector);
1380         }
1381
1382         // done at last!
1383         compr_img->current_block = block;
1384
1385 finish:
1386         if (dest != cdbuffer) // copy avoid HACK
1387                 memcpy(dest, compr_img->buff_raw[compr_img->sector_in_blk],
1388                         CD_FRAMESIZE_RAW);
1389         return CD_FRAMESIZE_RAW;
1390 }
1391
1392 #ifdef HAVE_CHD
1393 static int cdread_chd(FILE *f, unsigned int base, void *dest, int sector)
1394 {
1395         int hunk;
1396
1397         if (base)
1398                 sector += base;
1399
1400         hunk = sector / chd_img->sectors_per_hunk;
1401         chd_img->sector_in_hunk = sector % chd_img->sectors_per_hunk;
1402
1403         if (hunk != chd_img->current_hunk)
1404         {
1405                 chd_read(chd_img->chd, hunk, chd_img->buffer);
1406                 chd_img->current_hunk = hunk;
1407         }
1408
1409         if (dest != cdbuffer) // copy avoid HACK
1410                 memcpy(dest, chd_img->buffer[chd_img->sector_in_hunk],
1411                         CD_FRAMESIZE_RAW);
1412         if (subChanMixed) {
1413                 memcpy(subbuffer, chd_img->buffer[chd_img->sector_in_hunk] + CD_FRAMESIZE_RAW,
1414                         SUB_FRAMESIZE);
1415                 if (subChanRaw)
1416                         DecodeRawSubData();
1417         }
1418         return CD_FRAMESIZE_RAW;
1419 }
1420 #endif
1421 static int cdread_2048(FILE *f, unsigned int base, void *dest, int sector)
1422 {
1423         int ret;
1424
1425         fseek(f, base + sector * 2048, SEEK_SET);
1426         ret = fread((char *)dest + 12 * 2, 1, 2048, f);
1427
1428         // not really necessary, fake mode 2 header
1429         memset(cdbuffer, 0, 12 * 2);
1430         sec2msf(sector + 2 * 75, (char *)&cdbuffer[12]);
1431         cdbuffer[12 + 3] = 1;
1432
1433         return ret;
1434 }
1435
1436 #ifndef _WIN32
1437
1438 static int cdread_async(FILE *f, unsigned int base, void *dest, int sector) {
1439   boolean found = FALSE;
1440   int i = sector % SECTOR_BUFFER_SIZE;
1441   long ret;
1442
1443   if (f != cdHandle || base != 0 || dest != cdbuffer) {
1444     // Async reads are only supported for cdbuffer, so call the sync
1445     // function directly.
1446     return sync_cdimg_read_func(f, base, dest, sector);
1447   }
1448
1449   pthread_mutex_lock(&read_thread_msg_lock);
1450
1451   // Only wait if we're not trying to read the next sector and
1452   // sector_start is set (meaning the last request hasn't been
1453   // processed yet)
1454   while(read_thread_sector_start != -1 && read_thread_sector_end + 1 != sector) {
1455     pthread_cond_wait(&read_thread_msg_done, &read_thread_msg_lock);
1456   }
1457
1458   if (read_thread_sector_start == -1)
1459     read_thread_sector_start = sector;
1460
1461   read_thread_sector_end = sector;
1462   pthread_cond_signal(&read_thread_msg_avail);
1463   pthread_mutex_unlock(&read_thread_msg_lock);
1464
1465   do {
1466     pthread_mutex_lock(&sectorbuffer_lock);
1467     if (sectorbuffer[i].sector == sector) {
1468       sectorbuffer_index = i;
1469       ret = sectorbuffer[i].ret;
1470       found = TRUE;
1471     }
1472
1473     if (!found) {
1474       pthread_cond_wait(&sectorbuffer_cond, &sectorbuffer_lock);
1475     }
1476     pthread_mutex_unlock(&sectorbuffer_lock);
1477   } while (!found);
1478
1479   return ret;
1480 }
1481
1482 #endif
1483
1484 static unsigned char * CALLBACK ISOgetBuffer_compr(void) {
1485         return compr_img->buff_raw[compr_img->sector_in_blk] + 12;
1486 }
1487
1488 #ifdef HAVE_CHD
1489 static unsigned char * CALLBACK ISOgetBuffer_chd(void) {
1490         return chd_img->buffer[chd_img->sector_in_hunk] + 12;
1491 }
1492 #endif
1493
1494 #ifndef _WIN32
1495 static unsigned char * CALLBACK ISOgetBuffer_async(void) {
1496   unsigned char *buffer;
1497   pthread_mutex_lock(&sectorbuffer_lock);
1498   buffer = sectorbuffer[sectorbuffer_index].data;
1499   pthread_mutex_unlock(&sectorbuffer_lock);
1500   return buffer + 12;
1501 }
1502
1503 #endif
1504
1505 static unsigned char * CALLBACK ISOgetBuffer(void) {
1506         return cdbuffer + 12;
1507 }
1508
1509 static void PrintTracks(void) {
1510         int i;
1511
1512         for (i = 1; i <= numtracks; i++) {
1513                 SysPrintf(_("Track %.2d (%s) - Start %.2d:%.2d:%.2d, Length %.2d:%.2d:%.2d\n"),
1514                         i, (ti[i].type == DATA ? "DATA" : "AUDIO"),
1515                         ti[i].start[0], ti[i].start[1], ti[i].start[2],
1516                         ti[i].length[0], ti[i].length[1], ti[i].length[2]);
1517         }
1518 }
1519
1520 // This function is invoked by the front-end when opening an ISO
1521 // file for playback
1522 static long CALLBACK ISOopen(void) {
1523         boolean isMode1ISO = FALSE;
1524         char alt_bin_filename[MAXPATHLEN];
1525         const char *bin_filename;
1526         char image_str[1024];
1527         int is_chd = 0;
1528
1529         if (cdHandle != NULL) {
1530                 return 0; // it's already open
1531         }
1532
1533         cdHandle = fopen(GetIsoFile(), "rb");
1534         if (cdHandle == NULL) {
1535                 SysPrintf(_("Could't open '%s' for reading: %s\n"),
1536                         GetIsoFile(), strerror(errno));
1537                 return -1;
1538         }
1539
1540         snprintf(image_str, sizeof(image_str) - 6*4 - 1,
1541                 "Loaded CD Image: %s", GetIsoFile());
1542
1543         cddaBigEndian = FALSE;
1544         subChanMixed = FALSE;
1545         subChanRaw = FALSE;
1546         pregapOffset = 0;
1547         cdrIsoMultidiskCount = 1;
1548         multifile = 0;
1549
1550         CDR_getBuffer = ISOgetBuffer;
1551         cdimg_read_func = cdread_normal;
1552
1553         if (parsetoc(GetIsoFile()) == 0) {
1554                 strcat(image_str, "[+toc]");
1555         }
1556         else if (parseccd(GetIsoFile()) == 0) {
1557                 strcat(image_str, "[+ccd]");
1558         }
1559         else if (parsemds(GetIsoFile()) == 0) {
1560                 strcat(image_str, "[+mds]");
1561         }
1562         else if (parsecue(GetIsoFile()) == 0) {
1563                 strcat(image_str, "[+cue]");
1564         }
1565         if (handlepbp(GetIsoFile()) == 0) {
1566                 strcat(image_str, "[+pbp]");
1567                 CDR_getBuffer = ISOgetBuffer_compr;
1568                 cdimg_read_func = cdread_compressed;
1569         }
1570         else if (handlecbin(GetIsoFile()) == 0) {
1571                 strcat(image_str, "[+cbin]");
1572                 CDR_getBuffer = ISOgetBuffer_compr;
1573                 cdimg_read_func = cdread_compressed;
1574         }
1575 #ifdef HAVE_CHD
1576         else if (handlechd(GetIsoFile()) == 0) {
1577                 strcat(image_str, "[+chd]");
1578                 CDR_getBuffer = ISOgetBuffer_chd;
1579                 cdimg_read_func = cdread_chd;
1580                 is_chd = 1;
1581         }
1582 #endif
1583
1584         if (!subChanMixed && opensubfile(GetIsoFile()) == 0) {
1585                 strcat(image_str, "[+sub]");
1586         }
1587         if (opensbifile(GetIsoFile()) == 0) {
1588                 strcat(image_str, "[+sbi]");
1589         }
1590
1591         fseeko(cdHandle, 0, SEEK_END);
1592
1593         // maybe user selected metadata file instead of main .bin ..
1594         bin_filename = GetIsoFile();
1595         if (ftello(cdHandle) < 2352 * 0x10) {
1596                 static const char *exts[] = { ".bin", ".BIN", ".img", ".IMG" };
1597                 FILE *tmpf = NULL;
1598                 size_t i;
1599                 char *p;
1600
1601                 strncpy(alt_bin_filename, bin_filename, sizeof(alt_bin_filename));
1602                 alt_bin_filename[MAXPATHLEN - 1] = '\0';
1603                 if (strlen(alt_bin_filename) >= 4) {
1604                         p = alt_bin_filename + strlen(alt_bin_filename) - 4;
1605                         for (i = 0; i < sizeof(exts) / sizeof(exts[0]); i++) {
1606                                 strcpy(p, exts[i]);
1607                                 tmpf = fopen(alt_bin_filename, "rb");
1608                                 if (tmpf != NULL)
1609                                         break;
1610                         }
1611                 }
1612                 if (tmpf != NULL) {
1613                         bin_filename = alt_bin_filename;
1614                         fclose(cdHandle);
1615                         cdHandle = tmpf;
1616                         fseeko(cdHandle, 0, SEEK_END);
1617                 }
1618         }
1619
1620         // guess whether it is mode1/2048
1621         if (ftello(cdHandle) % 2048 == 0) {
1622                 unsigned int modeTest = 0;
1623                 fseek(cdHandle, 0, SEEK_SET);
1624                 if (!fread(&modeTest, sizeof(modeTest), 1, cdHandle)) {
1625 #ifndef NDEBUG
1626                         SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
1627 #endif
1628                         return -1;
1629                 }
1630                 if (SWAP32(modeTest) != 0xffffff00) {
1631                         strcat(image_str, "[2048]");
1632                         isMode1ISO = TRUE;
1633                 }
1634         }
1635         fseek(cdHandle, 0, SEEK_SET);
1636
1637         SysPrintf("%s.\n", image_str);
1638
1639         PrintTracks();
1640
1641         if (subChanMixed && !is_chd)
1642                 cdimg_read_func = cdread_sub_mixed;
1643         else if (isMode1ISO)
1644                 cdimg_read_func = cdread_2048;
1645
1646         // make sure we have another handle open for cdda
1647         if (numtracks > 1 && ti[1].handle == NULL) {
1648                 ti[1].handle = fopen(bin_filename, "rb");
1649         }
1650         cdda_cur_sector = 0;
1651         cdda_file_offset = 0;
1652
1653   if (Config.AsyncCD) {
1654     readThreadStart();
1655   }
1656         return 0;
1657 }
1658
1659 static long CALLBACK ISOclose(void) {
1660         int i;
1661
1662         if (cdHandle != NULL) {
1663                 fclose(cdHandle);
1664                 cdHandle = NULL;
1665         }
1666         if (subHandle != NULL) {
1667                 fclose(subHandle);
1668                 subHandle = NULL;
1669         }
1670         playing = FALSE;
1671         cddaHandle = NULL;
1672
1673         if (compr_img != NULL) {
1674                 free(compr_img->index_table);
1675                 free(compr_img);
1676                 compr_img = NULL;
1677         }
1678
1679 #ifdef HAVE_CHD
1680         if (chd_img != NULL) {
1681                 chd_close(chd_img->chd);
1682                 free(chd_img->buffer);
1683                 free(chd_img);
1684                 chd_img = NULL;
1685         }
1686 #endif
1687
1688         for (i = 1; i <= numtracks; i++) {
1689                 if (ti[i].handle != NULL) {
1690                         fclose(ti[i].handle);
1691                         ti[i].handle = NULL;
1692                 }
1693         }
1694         numtracks = 0;
1695         ti[1].type = 0;
1696         UnloadSBI();
1697
1698         memset(cdbuffer, 0, sizeof(cdbuffer));
1699         CDR_getBuffer = ISOgetBuffer;
1700
1701         if (Config.AsyncCD) {
1702                 readThreadStop();
1703         }
1704
1705         return 0;
1706 }
1707
1708 static long CALLBACK ISOinit(void) {
1709         assert(cdHandle == NULL);
1710         assert(subHandle == NULL);
1711
1712         return 0; // do nothing
1713 }
1714
1715 static long CALLBACK ISOshutdown(void) {
1716         ISOclose();
1717         return 0;
1718 }
1719
1720 // return Starting and Ending Track
1721 // buffer:
1722 //  byte 0 - start track
1723 //  byte 1 - end track
1724 static long CALLBACK ISOgetTN(unsigned char *buffer) {
1725         buffer[0] = 1;
1726
1727         if (numtracks > 0) {
1728                 buffer[1] = numtracks;
1729         }
1730         else {
1731                 buffer[1] = 1;
1732         }
1733
1734         return 0;
1735 }
1736
1737 // return Track Time
1738 // buffer:
1739 //  byte 0 - frame
1740 //  byte 1 - second
1741 //  byte 2 - minute
1742 static long CALLBACK ISOgetTD(unsigned char track, unsigned char *buffer) {
1743         if (track == 0) {
1744                 unsigned int sect;
1745                 unsigned char time[3];
1746                 sect = msf2sec(ti[numtracks].start) + msf2sec(ti[numtracks].length);
1747                 sec2msf(sect, (char *)time);
1748                 buffer[2] = time[0];
1749                 buffer[1] = time[1];
1750                 buffer[0] = time[2];
1751         }
1752         else if (numtracks > 0 && track <= numtracks) {
1753                 buffer[2] = ti[track].start[0];
1754                 buffer[1] = ti[track].start[1];
1755                 buffer[0] = ti[track].start[2];
1756         }
1757         else {
1758                 buffer[2] = 0;
1759                 buffer[1] = 2;
1760                 buffer[0] = 0;
1761         }
1762
1763         return 0;
1764 }
1765
1766 // decode 'raw' subchannel data ripped by cdrdao
1767 static void DecodeRawSubData(void) {
1768         unsigned char subQData[12];
1769         int i;
1770
1771         memset(subQData, 0, sizeof(subQData));
1772
1773         for (i = 0; i < 8 * 12; i++) {
1774                 if (subbuffer[i] & (1 << 6)) { // only subchannel Q is needed
1775                         subQData[i >> 3] |= (1 << (7 - (i & 7)));
1776                 }
1777         }
1778
1779         memcpy(&subbuffer[12], subQData, 12);
1780 }
1781
1782 // read track
1783 // time: byte 0 - minute; byte 1 - second; byte 2 - frame
1784 // uses bcd format
1785 static boolean CALLBACK ISOreadTrack(unsigned char *time) {
1786         int sector = MSF2SECT(btoi(time[0]), btoi(time[1]), btoi(time[2]));
1787         long ret;
1788
1789         if (cdHandle == NULL) {
1790                 return 0;
1791         }
1792
1793         if (pregapOffset) {
1794                 subChanMissing = FALSE;
1795                 if (sector >= pregapOffset) {
1796                         sector -= 2 * 75;
1797                         if (sector < pregapOffset)
1798                                 subChanMissing = TRUE;
1799                 }
1800         }
1801
1802         ret = cdimg_read_func(cdHandle, 0, cdbuffer, sector);
1803         if (ret < 0)
1804                 return 0;
1805
1806         if (subHandle != NULL) {
1807                 fseek(subHandle, sector * SUB_FRAMESIZE, SEEK_SET);
1808                 if (fread(subbuffer, 1, SUB_FRAMESIZE, subHandle) != SUB_FRAMESIZE)
1809                         /* Faulty subchannel data shouldn't cause a read failure */
1810                         return 0;
1811
1812                 if (subChanRaw) DecodeRawSubData();
1813         }
1814
1815         return 1;
1816 }
1817
1818 // plays cdda audio
1819 // sector: byte 0 - minute; byte 1 - second; byte 2 - frame
1820 // does NOT uses bcd format
1821 static long CALLBACK ISOplay(void) {
1822         playing = TRUE;
1823         return 0;
1824 }
1825
1826 // stops cdda audio
1827 static long CALLBACK ISOstop(void) {
1828         playing = FALSE;
1829         return 0;
1830 }
1831
1832 // gets subchannel data
1833 static unsigned char* CALLBACK ISOgetBufferSub(void) {
1834         if ((subHandle != NULL || subChanMixed) && !subChanMissing) {
1835                 return subbuffer;
1836         }
1837
1838         return NULL;
1839 }
1840
1841 static long CALLBACK ISOgetStatus(struct CdrStat *stat) {
1842         u32 sect;
1843
1844         CDR__getStatus(stat);
1845
1846         if (playing) {
1847                 stat->Type = 0x02;
1848                 stat->Status |= 0x80;
1849         }
1850         else {
1851                 // BIOS - boot ID (CD type)
1852                 stat->Type = ti[1].type;
1853         }
1854
1855         // relative -> absolute time
1856         sect = cddaCurPos;
1857         sec2msf(sect, (char *)stat->Time);
1858
1859         return 0;
1860 }
1861
1862 // read CDDA sector into buffer
1863 long CALLBACK ISOreadCDDA(unsigned char m, unsigned char s, unsigned char f, unsigned char *buffer) {
1864         unsigned char msf[3] = {m, s, f};
1865         unsigned int file, track, track_start = 0;
1866         int ret;
1867
1868         cddaCurPos = msf2sec((char *)msf);
1869
1870         // find current track index
1871         for (track = numtracks; ; track--) {
1872                 track_start = msf2sec(ti[track].start);
1873                 if (track_start <= cddaCurPos)
1874                         break;
1875                 if (track == 1)
1876                         break;
1877         }
1878
1879         // data tracks play silent
1880         if (ti[track].type != CDDA) {
1881                 memset(buffer, 0, CD_FRAMESIZE_RAW);
1882                 return 0;
1883         }
1884
1885         file = 1;
1886         if (multifile) {
1887                 // find the file that contains this track
1888                 for (file = track; file > 1; file--)
1889                         if (ti[file].handle != NULL)
1890                                 break;
1891         }
1892
1893         ret = cdimg_read_func(ti[file].handle, ti[track].start_offset,
1894                 buffer, cddaCurPos - track_start);
1895         if (ret != CD_FRAMESIZE_RAW) {
1896                 memset(buffer, 0, CD_FRAMESIZE_RAW);
1897                 return -1;
1898         }
1899
1900         if (cddaBigEndian) {
1901                 int i;
1902                 unsigned char tmp;
1903
1904                 for (i = 0; i < CD_FRAMESIZE_RAW / 2; i++) {
1905                         tmp = buffer[i * 2];
1906                         buffer[i * 2] = buffer[i * 2 + 1];
1907                         buffer[i * 2 + 1] = tmp;
1908                 }
1909         }
1910
1911         return 0;
1912 }
1913
1914 void cdrIsoInit(void) {
1915         CDR_init = ISOinit;
1916         CDR_shutdown = ISOshutdown;
1917         CDR_open = ISOopen;
1918         CDR_close = ISOclose;
1919         CDR_getTN = ISOgetTN;
1920         CDR_getTD = ISOgetTD;
1921         CDR_readTrack = ISOreadTrack;
1922         CDR_getBuffer = ISOgetBuffer;
1923         CDR_play = ISOplay;
1924         CDR_stop = ISOstop;
1925         CDR_getBufferSub = ISOgetBufferSub;
1926         CDR_getStatus = ISOgetStatus;
1927         CDR_readCDDA = ISOreadCDDA;
1928
1929         CDR_getDriveLetter = CDR__getDriveLetter;
1930         CDR_configure = CDR__configure;
1931         CDR_test = CDR__test;
1932         CDR_about = CDR__about;
1933         CDR_setfilename = CDR__setfilename;
1934
1935         numtracks = 0;
1936 }
1937
1938 int cdrIsoActive(void) {
1939         return (cdHandle != NULL);
1940 }