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 #ifndef _WIN32
  46 // to enable the USE_READ_THREAD code, fix:
  47 // - https://github.com/notaz/pcsx_rearmed/issues/257
  48 // - ISOgetBufferSub to not race with async code
  49 //#define USE_READ_THREAD
  50 #endif
  51
  52 #ifdef USE_LIBRETRO_VFS
  53 #include <streams/file_stream_transforms.h>
  54 #undef fseeko
  55 #undef ftello
  56 #define ftello rftell
  57 #define fseeko rfseek
  58 #endif
  59
  60 #define OFF_T_MSB ((off_t)1 << (sizeof(off_t) * 8 - 1))
  61
  62 unsigned int cdrIsoMultidiskCount;
  63 unsigned int cdrIsoMultidiskSelect;
  64
  65 static FILE *cdHandle = NULL;
  66 static FILE *cddaHandle = NULL;
  67 static FILE *subHandle = NULL;
  68
  69 static boolean subChanMixed = FALSE;
  70 static boolean subChanRaw = FALSE;
  71
  72 static boolean multifile = FALSE;
  73
  74 static unsigned char cdbuffer[CD_FRAMESIZE_RAW];
  75 static unsigned char subbuffer[SUB_FRAMESIZE];
  76
  77 static boolean playing = FALSE;
  78 static boolean cddaBigEndian = FALSE;
  79 /* Frame offset into CD image where pregap data would be found if it was there.
  80  * If a game seeks there we must *not* return subchannel data since it's
  81  * not in the CD image, so that cdrom code can fake subchannel data instead.
  82  * XXX: there could be multiple pregaps but PSX dumps only have one? */
  83 static unsigned int pregapOffset;
  84
  85 static unsigned int cddaCurPos;
  86
  87 // compressed image stuff
  88 static struct {
  89         unsigned char buff_raw[16][CD_FRAMESIZE_RAW];
  90         unsigned char buff_compressed[CD_FRAMESIZE_RAW * 16 + 100];
  91         off_t *index_table;
  92         unsigned int index_len;
  93         unsigned int block_shift;
  94         unsigned int current_block;
  95         unsigned int sector_in_blk;
  96 } *compr_img;
  97
  98 #ifdef HAVE_CHD
  99 static struct {
 100         unsigned char (*buffer)[CD_FRAMESIZE_RAW + SUB_FRAMESIZE];
 101         chd_file* chd;
 102         const chd_header* header;
 103         unsigned int sectors_per_hunk;
 104         unsigned int current_hunk;
 105         unsigned int sector_in_hunk;
 106 } *chd_img;
 107 #endif
 108
 109 static int (*cdimg_read_func)(FILE *f, unsigned int base, void *dest, int sector);
 110 static int (*cdimg_read_sub_func)(FILE *f, int sector);
 111
 112 char* CALLBACK CDR__getDriveLetter(void);
 113 long CALLBACK CDR__configure(void);
 114 long CALLBACK CDR__test(void);
 115 void CALLBACK CDR__about(void);
 116 long CALLBACK CDR__setfilename(char *filename);
 117 long CALLBACK CDR__getStatus(struct CdrStat *stat);
 118
 119 static void DecodeRawSubData(void);
 120
 121 struct trackinfo {
 122         enum {DATA=1, CDDA} type;
 123         char start[3];          // MSF-format
 124         char length[3];         // MSF-format
 125         FILE *handle;           // for multi-track images CDDA
 126         unsigned int start_offset; // byte offset from start of above file
 127 };
 128
 129 #define MAXTRACKS 100 /* How many tracks can a CD hold? */
 130
 131 static int numtracks = 0;
 132 static struct trackinfo ti[MAXTRACKS];
 133
 134 // get a sector from a msf-array
 135 static unsigned int msf2sec(char *msf) {
 136         return ((msf[0] * 60 + msf[1]) * 75) + msf[2];
 137 }
 138
 139 static void sec2msf(unsigned int s, char *msf) {
 140         msf[0] = s / 75 / 60;
 141         s = s - msf[0] * 75 * 60;
 142         msf[1] = s / 75;
 143         s = s - msf[1] * 75;
 144         msf[2] = s;
 145 }
 146
 147 // divide a string of xx:yy:zz into m, s, f
 148 static void tok2msf(char *time, char *msf) {
 149         char *token;
 150
 151         token = strtok(time, ":");
 152         if (token) {
 153                 msf[0] = atoi(token);
 154         }
 155         else {
 156                 msf[0] = 0;
 157         }
 158
 159         token = strtok(NULL, ":");
 160         if (token) {
 161                 msf[1] = atoi(token);
 162         }
 163         else {
 164                 msf[1] = 0;
 165         }
 166
 167         token = strtok(NULL, ":");
 168         if (token) {
 169                 msf[2] = atoi(token);
 170         }
 171         else {
 172                 msf[2] = 0;
 173         }
 174 }
 175
 176 // this function tries to get the .toc file of the given .bin
 177 // the necessary data is put into the ti (trackinformation)-array
 178 static int parsetoc(const char *isofile) {
 179         char                    tocname[MAXPATHLEN];
 180         FILE                    *fi;
 181         char                    linebuf[256], tmp[256], name[256];
 182         char                    *token;
 183         char                    time[20], time2[20];
 184         unsigned int    t, sector_offs, sector_size;
 185         unsigned int    current_zero_gap = 0;
 186
 187         numtracks = 0;
 188
 189         // copy name of the iso and change extension from .bin to .toc
 190         strncpy(tocname, isofile, sizeof(tocname));
 191         tocname[MAXPATHLEN - 1] = '\0';
 192         if (strlen(tocname) >= 4) {
 193                 strcpy(tocname + strlen(tocname) - 4, ".toc");
 194         }
 195         else {
 196                 return -1;
 197         }
 198
 199         if ((fi = fopen(tocname, "r")) == NULL) {
 200                 // try changing extension to .cue (to satisfy some stupid tutorials)
 201                 strcpy(tocname + strlen(tocname) - 4, ".cue");
 202                 if ((fi = fopen(tocname, "r")) == NULL) {
 203                         // if filename is image.toc.bin, try removing .bin (for Brasero)
 204                         strcpy(tocname, isofile);
 205                         t = strlen(tocname);
 206                         if (t >= 8 && strcmp(tocname + t - 8, ".toc.bin") == 0) {
 207                                 tocname[t - 4] = '\0';
 208                                 if ((fi = fopen(tocname, "r")) == NULL) {
 209                                         return -1;
 210                                 }
 211                         }
 212                         else {
 213                                 return -1;
 214                         }
 215                 }
 216                 // check if it's really a TOC named as a .cue
 217                 if (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 218                         token = strtok(linebuf, " ");
 219                         if (token && strncmp(token, "CD", 2) != 0 && strcmp(token, "CATALOG") != 0) {
 220                                 fclose(fi);
 221                                 return -1;
 222                         }
 223                 }
 224                 fseek(fi, 0, SEEK_SET);
 225         }
 226
 227         memset(&ti, 0, sizeof(ti));
 228         cddaBigEndian = TRUE; // cdrdao uses big-endian for CD Audio
 229
 230         sector_size = CD_FRAMESIZE_RAW;
 231         sector_offs = 2 * 75;
 232
 233         // parse the .toc file
 234         while (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 235                 // search for tracks
 236                 strncpy(tmp, linebuf, sizeof(linebuf));
 237                 token = strtok(tmp, " ");
 238
 239                 if (token == NULL) continue;
 240
 241                 if (!strcmp(token, "TRACK")) {
 242                         sector_offs += current_zero_gap;
 243                         current_zero_gap = 0;
 244
 245                         // get type of track
 246                         token = strtok(NULL, " ");
 247                         numtracks++;
 248
 249                         if (!strncmp(token, "MODE2_RAW", 9)) {
 250                                 ti[numtracks].type = DATA;
 251                                 sec2msf(2 * 75, ti[numtracks].start); // assume data track on 0:2:0
 252
 253                                 // check if this image contains mixed subchannel data
 254                                 token = strtok(NULL, " ");
 255                                 if (token != NULL && !strncmp(token, "RW", 2)) {
 256                                         sector_size = CD_FRAMESIZE_RAW + SUB_FRAMESIZE;
 257                                         subChanMixed = TRUE;
 258                                         if (!strncmp(token, "RW_RAW", 6))
 259                                                 subChanRaw = TRUE;
 260                                 }
 261                         }
 262                         else if (!strncmp(token, "AUDIO", 5)) {
 263                                 ti[numtracks].type = CDDA;
 264                         }
 265                 }
 266                 else if (!strcmp(token, "DATAFILE")) {
 267                         if (ti[numtracks].type == CDDA) {
 268                                 sscanf(linebuf, "DATAFILE \"%[^\"]\" #%d %8s", name, &t, time2);
 269                                 ti[numtracks].start_offset = t;
 270                                 t = t / sector_size + sector_offs;
 271                                 sec2msf(t, (char *)&ti[numtracks].start);
 272                                 tok2msf((char *)&time2, (char *)&ti[numtracks].length);
 273                         }
 274                         else {
 275                                 sscanf(linebuf, "DATAFILE \"%[^\"]\" %8s", name, time);
 276                                 tok2msf((char *)&time, (char *)&ti[numtracks].length);
 277                         }
 278                 }
 279                 else if (!strcmp(token, "FILE")) {
 280                         sscanf(linebuf, "FILE \"%[^\"]\" #%d %8s %8s", name, &t, time, time2);
 281                         tok2msf((char *)&time, (char *)&ti[numtracks].start);
 282                         t += msf2sec(ti[numtracks].start) * sector_size;
 283                         ti[numtracks].start_offset = t;
 284                         t = t / sector_size + sector_offs;
 285                         sec2msf(t, (char *)&ti[numtracks].start);
 286                         tok2msf((char *)&time2, (char *)&ti[numtracks].length);
 287                 }
 288                 else if (!strcmp(token, "ZERO") || !strcmp(token, "SILENCE")) {
 289                         // skip unneeded optional fields
 290                         while (token != NULL) {
 291                                 token = strtok(NULL, " ");
 292                                 if (strchr(token, ':') != NULL)
 293                                         break;
 294                         }
 295                         if (token != NULL) {
 296                                 tok2msf(token, tmp);
 297                                 current_zero_gap = msf2sec(tmp);
 298                         }
 299                         if (numtracks > 1) {
 300                                 t = ti[numtracks - 1].start_offset;
 301                                 t /= sector_size;
 302                                 pregapOffset = t + msf2sec(ti[numtracks - 1].length);
 303                         }
 304                 }
 305                 else if (!strcmp(token, "START")) {
 306                         token = strtok(NULL, " ");
 307                         if (token != NULL && strchr(token, ':')) {
 308                                 tok2msf(token, tmp);
 309                                 t = msf2sec(tmp);
 310                                 ti[numtracks].start_offset += (t - current_zero_gap) * sector_size;
 311                                 t = msf2sec(ti[numtracks].start) + t;
 312                                 sec2msf(t, (char *)&ti[numtracks].start);
 313                         }
 314                 }
 315         }
 316
 317         fclose(fi);
 318
 319         return 0;
 320 }
 321
 322 // this function tries to get the .cue file of the given .bin
 323 // the necessary data is put into the ti (trackinformation)-array
 324 static int parsecue(const char *isofile) {
 325         char                    cuename[MAXPATHLEN];
 326         char                    filepath[MAXPATHLEN];
 327         char                    *incue_fname;
 328         FILE                    *fi;
 329         char                    *token;
 330         char                    time[20];
 331         char                    *tmp;
 332         char                    linebuf[256], tmpb[256], dummy[256];
 333         unsigned int    incue_max_len;
 334         unsigned int    t, file_len, mode, sector_offs;
 335         unsigned int    sector_size = 2352;
 336
 337         numtracks = 0;
 338
 339         // copy name of the iso and change extension from .bin to .cue
 340         strncpy(cuename, isofile, sizeof(cuename));
 341         cuename[MAXPATHLEN - 1] = '\0';
 342         if (strlen(cuename) >= 4) {
 343                 // If 'isofile' is a '.cd<X>' file, use it as a .cue file
 344                 //  and don't try to search the additional .cue file
 345                 if (strncasecmp(cuename + strlen(cuename) - 4, ".cd", 3) != 0 )
 346                         strcpy(cuename + strlen(cuename) - 4, ".cue");
 347         }
 348         else {
 349                 return -1;
 350         }
 351
 352         if ((fi = fopen(cuename, "r")) == NULL) {
 353                 return -1;
 354         }
 355
 356         // Some stupid tutorials wrongly tell users to use cdrdao to rip a
 357         // "bin/cue" image, which is in fact a "bin/toc" image. So let's check
 358         // that...
 359         if (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 360                 if (!strncmp(linebuf, "CD_ROM_XA", 9)) {
 361                         // Don't proceed further, as this is actually a .toc file rather
 362                         // than a .cue file.
 363                         fclose(fi);
 364                         return parsetoc(isofile);
 365                 }
 366                 fseek(fi, 0, SEEK_SET);
 367         }
 368
 369         // build a path for files referenced in .cue
 370         strncpy(filepath, cuename, sizeof(filepath));
 371         tmp = strrchr(filepath, '/');
 372         if (tmp == NULL)
 373                 tmp = strrchr(filepath, '\\');
 374         if (tmp != NULL)
 375                 tmp++;
 376         else
 377                 tmp = filepath;
 378         *tmp = 0;
 379         filepath[sizeof(filepath) - 1] = 0;
 380         incue_fname = tmp;
 381         incue_max_len = sizeof(filepath) - (tmp - filepath) - 1;
 382
 383         memset(&ti, 0, sizeof(ti));
 384
 385         file_len = 0;
 386         sector_offs = 2 * 75;
 387
 388         while (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 389                 strncpy(dummy, linebuf, sizeof(linebuf));
 390                 token = strtok(dummy, " ");
 391
 392                 if (token == NULL) {
 393                         continue;
 394                 }
 395
 396                 if (!strcmp(token, "TRACK")) {
 397                         numtracks++;
 398
 399                         sector_size = 0;
 400                         if (strstr(linebuf, "AUDIO") != NULL) {
 401                                 ti[numtracks].type = CDDA;
 402                                 sector_size = 2352;
 403                         }
 404                         else if (sscanf(linebuf, " TRACK %u MODE%u/%u", &t, &mode, &sector_size) == 3)
 405                                 ti[numtracks].type = DATA;
 406                         else {
 407                                 SysPrintf(".cue: failed to parse TRACK\n");
 408                                 ti[numtracks].type = numtracks == 1 ? DATA : CDDA;
 409                         }
 410                         if (sector_size == 0)
 411                                 sector_size = 2352;
 412                 }
 413                 else if (!strcmp(token, "INDEX")) {
 414                         if (sscanf(linebuf, " INDEX %02d %8s", &t, time) != 2)
 415                                 SysPrintf(".cue: failed to parse INDEX\n");
 416                         tok2msf(time, (char *)&ti[numtracks].start);
 417
 418                         t = msf2sec(ti[numtracks].start);
 419                         ti[numtracks].start_offset = t * sector_size;
 420                         t += sector_offs;
 421                         sec2msf(t, ti[numtracks].start);
 422
 423                         // default track length to file length
 424                         t = file_len - ti[numtracks].start_offset / sector_size;
 425                         sec2msf(t, ti[numtracks].length);
 426
 427                         if (numtracks > 1 && ti[numtracks].handle == NULL) {
 428                                 // this track uses the same file as the last,
 429                                 // start of this track is last track's end
 430                                 t = msf2sec(ti[numtracks].start) - msf2sec(ti[numtracks - 1].start);
 431                                 sec2msf(t, ti[numtracks - 1].length);
 432                         }
 433                         if (numtracks > 1 && pregapOffset == -1)
 434                                 pregapOffset = ti[numtracks].start_offset / sector_size;
 435                 }
 436                 else if (!strcmp(token, "PREGAP")) {
 437                         if (sscanf(linebuf, " PREGAP %8s", time) == 1) {
 438                                 tok2msf(time, dummy);
 439                                 sector_offs += msf2sec(dummy);
 440                         }
 441                         pregapOffset = -1; // mark to fill track start_offset
 442                 }
 443                 else if (!strcmp(token, "FILE")) {
 444                         t = sscanf(linebuf, " FILE \"%255[^\"]\"", tmpb);
 445                         if (t != 1)
 446                                 sscanf(linebuf, " FILE %255s", tmpb);
 447
 448                         tmp = strrchr(tmpb, '\\');
 449                         if (tmp == NULL)
 450                                 tmp = strrchr(tmpb, '/');
 451                         if (tmp != NULL)
 452                                 tmp++;
 453                         else
 454                                 tmp = tmpb;
 455                         strncpy(incue_fname, tmp, incue_max_len);
 456                         ti[numtracks + 1].handle = fopen(filepath, "rb");
 457
 458                         // update global offset if this is not first file in this .cue
 459                         if (numtracks + 1 > 1) {
 460                                 multifile = 1;
 461                                 sector_offs += file_len;
 462                         }
 463
 464                         file_len = 0;
 465                         if (ti[numtracks + 1].handle == NULL) {
 466                                 SysPrintf(_("\ncould not open: %s\n"), filepath);
 467                                 continue;
 468                         }
 469                         fseek(ti[numtracks + 1].handle, 0, SEEK_END);
 470                         file_len = ftell(ti[numtracks + 1].handle) / 2352;
 471
 472                         if (numtracks == 0 && strlen(isofile) >= 4 &&
 473                                 (strcmp(isofile + strlen(isofile) - 4, ".cue") == 0 ||
 474                                 strncasecmp(isofile + strlen(isofile) - 4, ".cd", 3) == 0)) {
 475                                 // user selected .cue/.cdX as image file, use it's data track instead
 476                                 fclose(cdHandle);
 477                                 cdHandle = fopen(filepath, "rb");
 478                         }
 479                 }
 480         }
 481
 482         fclose(fi);
 483
 484         // if there are no tracks detected, then it's not a cue file
 485         if (!numtracks)
 486                 return -1;
 487
 488         return 0;
 489 }
 490
 491 // this function tries to get the .ccd file of the given .img
 492 // the necessary data is put into the ti (trackinformation)-array
 493 static int parseccd(const char *isofile) {
 494         char                    ccdname[MAXPATHLEN];
 495         FILE                    *fi;
 496         char                    linebuf[256];
 497         unsigned int    t;
 498
 499         numtracks = 0;
 500
 501         // copy name of the iso and change extension from .img to .ccd
 502         strncpy(ccdname, isofile, sizeof(ccdname));
 503         ccdname[MAXPATHLEN - 1] = '\0';
 504         if (strlen(ccdname) >= 4) {
 505                 strcpy(ccdname + strlen(ccdname) - 4, ".ccd");
 506         }
 507         else {
 508                 return -1;
 509         }
 510
 511         if ((fi = fopen(ccdname, "r")) == NULL) {
 512                 return -1;
 513         }
 514
 515         memset(&ti, 0, sizeof(ti));
 516
 517         while (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 518                 if (!strncmp(linebuf, "[TRACK", 6)){
 519                         numtracks++;
 520                 }
 521                 else if (!strncmp(linebuf, "MODE=", 5)) {
 522                         sscanf(linebuf, "MODE=%d", &t);
 523                         ti[numtracks].type = ((t == 0) ? CDDA : DATA);
 524                 }
 525                 else if (!strncmp(linebuf, "INDEX 1=", 8)) {
 526                         sscanf(linebuf, "INDEX 1=%d", &t);
 527                         sec2msf(t + 2 * 75, ti[numtracks].start);
 528                         ti[numtracks].start_offset = t * 2352;
 529
 530                         // If we've already seen another track, this is its end
 531                         if (numtracks > 1) {
 532                                 t = msf2sec(ti[numtracks].start) - msf2sec(ti[numtracks - 1].start);
 533                                 sec2msf(t, ti[numtracks - 1].length);
 534                         }
 535                 }
 536         }
 537
 538         fclose(fi);
 539
 540         // Fill out the last track's end based on size
 541         if (numtracks >= 1) {
 542                 fseek(cdHandle, 0, SEEK_END);
 543                 t = ftell(cdHandle) / 2352 - msf2sec(ti[numtracks].start) + 2 * 75;
 544                 sec2msf(t, ti[numtracks].length);
 545         }
 546
 547         return 0;
 548 }
 549
 550 // this function tries to get the .mds file of the given .mdf
 551 // the necessary data is put into the ti (trackinformation)-array
 552 static int parsemds(const char *isofile) {
 553         char                    mdsname[MAXPATHLEN];
 554         FILE                    *fi;
 555         unsigned int    offset, extra_offset, l, i;
 556         unsigned short  s;
 557
 558         numtracks = 0;
 559
 560         // copy name of the iso and change extension from .mdf to .mds
 561         strncpy(mdsname, isofile, sizeof(mdsname));
 562         mdsname[MAXPATHLEN - 1] = '\0';
 563         if (strlen(mdsname) >= 4) {
 564                 strcpy(mdsname + strlen(mdsname) - 4, ".mds");
 565         }
 566         else {
 567                 return -1;
 568         }
 569
 570         if ((fi = fopen(mdsname, "rb")) == NULL) {
 571                 return -1;
 572         }
 573
 574         memset(&ti, 0, sizeof(ti));
 575
 576         // check if it's a valid mds file
 577         if (fread(&i, 1, sizeof(i), fi) != sizeof(i))
 578                 goto fail_io;
 579         i = SWAP32(i);
 580         if (i != 0x4944454D) {
 581                 // not an valid mds file
 582                 fclose(fi);
 583                 return -1;
 584         }
 585
 586         // get offset to session block
 587         fseek(fi, 0x50, SEEK_SET);
 588         if (fread(&offset, 1, sizeof(offset), fi) != sizeof(offset))
 589                 goto fail_io;
 590         offset = SWAP32(offset);
 591
 592         // get total number of tracks
 593         offset += 14;
 594         fseek(fi, offset, SEEK_SET);
 595         if (fread(&s, 1, sizeof(s), fi) != sizeof(s))
 596                 goto fail_io;
 597         s = SWAP16(s);
 598         numtracks = s;
 599
 600         // get offset to track blocks
 601         fseek(fi, 4, SEEK_CUR);
 602         if (fread(&offset, 1, sizeof(offset), fi) != sizeof(offset))
 603                 goto fail_io;
 604         offset = SWAP32(offset);
 605
 606         // skip lead-in data
 607         while (1) {
 608                 fseek(fi, offset + 4, SEEK_SET);
 609                 if (fgetc(fi) < 0xA0) {
 610                         break;
 611                 }
 612                 offset += 0x50;
 613         }
 614
 615         // check if the image contains mixed subchannel data
 616         fseek(fi, offset + 1, SEEK_SET);
 617         subChanMixed = subChanRaw = (fgetc(fi) ? TRUE : FALSE);
 618
 619         // read track data
 620         for (i = 1; i <= numtracks; i++) {
 621                 fseek(fi, offset, SEEK_SET);
 622
 623                 // get the track type
 624                 ti[i].type = ((fgetc(fi) == 0xA9) ? CDDA : DATA);
 625                 fseek(fi, 8, SEEK_CUR);
 626
 627                 // get the track starting point
 628                 ti[i].start[0] = fgetc(fi);
 629                 ti[i].start[1] = fgetc(fi);
 630                 ti[i].start[2] = fgetc(fi);
 631
 632                 if (fread(&extra_offset, 1, sizeof(extra_offset), fi) != sizeof(extra_offset))
 633                         goto fail_io;
 634                 extra_offset = SWAP32(extra_offset);
 635
 636                 // get track start offset (in .mdf)
 637                 fseek(fi, offset + 0x28, SEEK_SET);
 638                 if (fread(&l, 1, sizeof(l), fi) != sizeof(l))
 639                         goto fail_io;
 640                 l = SWAP32(l);
 641                 ti[i].start_offset = l;
 642
 643                 // get pregap
 644                 fseek(fi, extra_offset, SEEK_SET);
 645                 if (fread(&l, 1, sizeof(l), fi) != sizeof(l))
 646                         goto fail_io;
 647                 l = SWAP32(l);
 648                 if (l != 0 && i > 1)
 649                         pregapOffset = msf2sec(ti[i].start);
 650
 651                 // get the track length
 652                 if (fread(&l, 1, sizeof(l), fi) != sizeof(l))
 653                         goto fail_io;
 654                 l = SWAP32(l);
 655                 sec2msf(l, ti[i].length);
 656
 657                 offset += 0x50;
 658         }
 659         fclose(fi);
 660         return 0;
 661 fail_io:
 662 #ifndef NDEBUG
 663         SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
 664 #endif
 665         fclose(fi);
 666         return -1;
 667 }
 668
 669 static int handlepbp(const char *isofile) {
 670         struct {
 671                 unsigned int sig;
 672                 unsigned int dontcare[8];
 673                 unsigned int psar_offs;
 674         } pbp_hdr;
 675         struct {
 676                 unsigned char type;
 677                 unsigned char pad0;
 678                 unsigned char track;
 679                 char index0[3];
 680                 char pad1;
 681                 char index1[3];
 682         } toc_entry;
 683         struct {
 684                 unsigned int offset;
 685                 unsigned int size;
 686                 unsigned int dontcare[6];
 687         } index_entry;
 688         char psar_sig[11];
 689         off_t psisoimg_offs, cdimg_base;
 690         unsigned int t, cd_length;
 691         unsigned int offsettab[8];
 692         unsigned int psar_offs, index_entry_size, index_entry_offset;
 693         const char *ext = NULL;
 694         int i, ret;
 695
 696         if (strlen(isofile) >= 4)
 697                 ext = isofile + strlen(isofile) - 4;
 698         if (ext == NULL || (strcmp(ext, ".pbp") != 0 && strcmp(ext, ".PBP") != 0))
 699                 return -1;
 700
 701         fseeko(cdHandle, 0, SEEK_SET);
 702
 703         numtracks = 0;
 704
 705         ret = fread(&pbp_hdr, 1, sizeof(pbp_hdr), cdHandle);
 706         if (ret != sizeof(pbp_hdr)) {
 707                 SysPrintf("failed to read pbp\n");
 708                 goto fail_io;
 709         }
 710
 711         psar_offs = SWAP32(pbp_hdr.psar_offs);
 712
 713         ret = fseeko(cdHandle, psar_offs, SEEK_SET);
 714         if (ret != 0) {
 715                 SysPrintf("failed to seek to %x\n", psar_offs);
 716                 goto fail_io;
 717         }
 718
 719         psisoimg_offs = psar_offs;
 720         if (fread(psar_sig, 1, sizeof(psar_sig), cdHandle) != sizeof(psar_sig))
 721                 goto fail_io;
 722         psar_sig[10] = 0;
 723         if (strcmp(psar_sig, "PSTITLEIMG") == 0) {
 724                 // multidisk image?
 725                 ret = fseeko(cdHandle, psar_offs + 0x200, SEEK_SET);
 726                 if (ret != 0) {
 727                         SysPrintf("failed to seek to %x\n", psar_offs + 0x200);
 728                         goto fail_io;
 729                 }
 730
 731                 if (fread(&offsettab, 1, sizeof(offsettab), cdHandle) != sizeof(offsettab)) {
 732                         SysPrintf("failed to read offsettab\n");
 733                         goto fail_io;
 734                 }
 735
 736                 for (i = 0; i < sizeof(offsettab) / sizeof(offsettab[0]); i++) {
 737                         if (offsettab[i] == 0)
 738                                 break;
 739                 }
 740                 cdrIsoMultidiskCount = i;
 741                 if (cdrIsoMultidiskCount == 0) {
 742                         SysPrintf("multidisk eboot has 0 images?\n");
 743                         goto fail_io;
 744                 }
 745
 746                 if (cdrIsoMultidiskSelect >= cdrIsoMultidiskCount)
 747                         cdrIsoMultidiskSelect = 0;
 748
 749                 psisoimg_offs += SWAP32(offsettab[cdrIsoMultidiskSelect]);
 750
 751                 ret = fseeko(cdHandle, psisoimg_offs, SEEK_SET);
 752                 if (ret != 0) {
 753                         SysPrintf("failed to seek to %llx\n", (long long)psisoimg_offs);
 754                         goto fail_io;
 755                 }
 756
 757                 if (fread(psar_sig, 1, sizeof(psar_sig), cdHandle) != sizeof(psar_sig))
 758                         goto fail_io;
 759                 psar_sig[10] = 0;
 760         }
 761
 762         if (strcmp(psar_sig, "PSISOIMG00") != 0) {
 763                 SysPrintf("bad psar_sig: %s\n", psar_sig);
 764                 goto fail_io;
 765         }
 766
 767         // seek to TOC
 768         ret = fseeko(cdHandle, psisoimg_offs + 0x800, SEEK_SET);
 769         if (ret != 0) {
 770                 SysPrintf("failed to seek to %llx\n", (long long)psisoimg_offs + 0x800);
 771                 goto fail_io;
 772         }
 773
 774         // first 3 entries are special
 775         fseek(cdHandle, sizeof(toc_entry), SEEK_CUR);
 776         if (fread(&toc_entry, 1, sizeof(toc_entry), cdHandle) != sizeof(toc_entry))
 777                 goto fail_io;
 778         numtracks = btoi(toc_entry.index1[0]);
 779
 780         if (fread(&toc_entry, 1, sizeof(toc_entry), cdHandle) != sizeof(toc_entry))
 781                 goto fail_io;
 782         cd_length = btoi(toc_entry.index1[0]) * 60 * 75 +
 783                 btoi(toc_entry.index1[1]) * 75 + btoi(toc_entry.index1[2]);
 784
 785         for (i = 1; i <= numtracks; i++) {
 786                 if (fread(&toc_entry, 1, sizeof(toc_entry), cdHandle) != sizeof(toc_entry))
 787                         goto fail_io;
 788
 789                 ti[i].type = (toc_entry.type == 1) ? CDDA : DATA;
 790
 791                 ti[i].start_offset = btoi(toc_entry.index0[0]) * 60 * 75 +
 792                         btoi(toc_entry.index0[1]) * 75 + btoi(toc_entry.index0[2]);
 793                 ti[i].start_offset *= 2352;
 794                 ti[i].start[0] = btoi(toc_entry.index1[0]);
 795                 ti[i].start[1] = btoi(toc_entry.index1[1]);
 796                 ti[i].start[2] = btoi(toc_entry.index1[2]);
 797
 798                 if (i > 1) {
 799                         t = msf2sec(ti[i].start) - msf2sec(ti[i - 1].start);
 800                         sec2msf(t, ti[i - 1].length);
 801                 }
 802         }
 803         t = cd_length - ti[numtracks].start_offset / 2352;
 804         sec2msf(t, ti[numtracks].length);
 805
 806         // seek to ISO index
 807         ret = fseeko(cdHandle, psisoimg_offs + 0x4000, SEEK_SET);
 808         if (ret != 0) {
 809                 SysPrintf("failed to seek to ISO index\n");
 810                 goto fail_io;
 811         }
 812
 813         compr_img = calloc(1, sizeof(*compr_img));
 814         if (compr_img == NULL)
 815                 goto fail_io;
 816
 817         compr_img->block_shift = 4;
 818         compr_img->current_block = (unsigned int)-1;
 819
 820         compr_img->index_len = (0x100000 - 0x4000) / sizeof(index_entry);
 821         compr_img->index_table = malloc((compr_img->index_len + 1) * sizeof(compr_img->index_table[0]));
 822         if (compr_img->index_table == NULL)
 823                 goto fail_io;
 824
 825         cdimg_base = psisoimg_offs + 0x100000;
 826         for (i = 0; i < compr_img->index_len; i++) {
 827                 ret = fread(&index_entry, 1, sizeof(index_entry), cdHandle);
 828                 if (ret != sizeof(index_entry)) {
 829                         SysPrintf("failed to read index_entry #%d\n", i);
 830                         goto fail_index;
 831                 }
 832
 833                 index_entry_size = SWAP32(index_entry.size);
 834                 index_entry_offset = SWAP32(index_entry.offset);
 835
 836                 if (index_entry_size == 0)
 837                         break;
 838
 839                 compr_img->index_table[i] = cdimg_base + index_entry_offset;
 840         }
 841         compr_img->index_table[i] = cdimg_base + index_entry_offset + index_entry_size;
 842
 843         return 0;
 844
 845 fail_index:
 846         free(compr_img->index_table);
 847         compr_img->index_table = NULL;
 848         goto done;
 849
 850 fail_io:
 851 #ifndef NDEBUG
 852         SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
 853 #endif
 854
 855 done:
 856         if (compr_img != NULL) {
 857                 free(compr_img);
 858                 compr_img = NULL;
 859         }
 860         return -1;
 861 }
 862
 863 static int handlecbin(const char *isofile) {
 864         struct
 865         {
 866                 char magic[4];
 867                 unsigned int header_size;
 868                 unsigned long long total_bytes;
 869                 unsigned int block_size;
 870                 unsigned char ver;              // 1
 871                 unsigned char align;
 872                 unsigned char rsv_06[2];
 873         } ciso_hdr;
 874         const char *ext = NULL;
 875         unsigned int *index_table = NULL;
 876         unsigned int index = 0, plain;
 877         int i, ret;
 878
 879         if (strlen(isofile) >= 5)
 880                 ext = isofile + strlen(isofile) - 5;
 881         if (ext == NULL || (strcasecmp(ext + 1, ".cbn") != 0 && strcasecmp(ext, ".cbin") != 0))
 882                 return -1;
 883
 884         fseek(cdHandle, 0, SEEK_SET);
 885
 886         ret = fread(&ciso_hdr, 1, sizeof(ciso_hdr), cdHandle);
 887         if (ret != sizeof(ciso_hdr)) {
 888                 SysPrintf("failed to read ciso header\n");
 889                 return -1;
 890         }
 891
 892         if (strncmp(ciso_hdr.magic, "CISO", 4) != 0 || ciso_hdr.total_bytes <= 0 || ciso_hdr.block_size <= 0) {
 893                 SysPrintf("bad ciso header\n");
 894                 return -1;
 895         }
 896         if (ciso_hdr.header_size != 0 && ciso_hdr.header_size != sizeof(ciso_hdr)) {
 897                 ret = fseeko(cdHandle, ciso_hdr.header_size, SEEK_SET);
 898                 if (ret != 0) {
 899                         SysPrintf("failed to seek to %x\n", ciso_hdr.header_size);
 900                         return -1;
 901                 }
 902         }
 903
 904         compr_img = calloc(1, sizeof(*compr_img));
 905         if (compr_img == NULL)
 906                 goto fail_io;
 907
 908         compr_img->block_shift = 0;
 909         compr_img->current_block = (unsigned int)-1;
 910
 911         compr_img->index_len = ciso_hdr.total_bytes / ciso_hdr.block_size;
 912         index_table = malloc((compr_img->index_len + 1) * sizeof(index_table[0]));
 913         if (index_table == NULL)
 914                 goto fail_io;
 915
 916         ret = fread(index_table, sizeof(index_table[0]), compr_img->index_len, cdHandle);
 917         if (ret != compr_img->index_len) {
 918                 SysPrintf("failed to read index table\n");
 919                 goto fail_index;
 920         }
 921
 922         compr_img->index_table = malloc((compr_img->index_len + 1) * sizeof(compr_img->index_table[0]));
 923         if (compr_img->index_table == NULL)
 924                 goto fail_index;
 925
 926         for (i = 0; i < compr_img->index_len + 1; i++) {
 927                 index = index_table[i];
 928                 plain = index & 0x80000000;
 929                 index &= 0x7fffffff;
 930                 compr_img->index_table[i] = (off_t)index << ciso_hdr.align;
 931                 if (plain)
 932                         compr_img->index_table[i] |= OFF_T_MSB;
 933         }
 934
 935         return 0;
 936
 937 fail_index:
 938         free(index_table);
 939 fail_io:
 940         if (compr_img != NULL) {
 941                 free(compr_img);
 942                 compr_img = NULL;
 943         }
 944         return -1;
 945 }
 946
 947 #ifdef HAVE_CHD
 948 static int handlechd(const char *isofile) {
 949         int frame_offset = 150;
 950         int file_offset = 0;
 951
 952         chd_img = calloc(1, sizeof(*chd_img));
 953         if (chd_img == NULL)
 954                 goto fail_io;
 955
 956         if(chd_open(isofile, CHD_OPEN_READ, NULL, &chd_img->chd) != CHDERR_NONE)
 957                 goto fail_io;
 958
 959         if (Config.CHD_Precache && (chd_precache(chd_img->chd) != CHDERR_NONE))
 960                 goto fail_io;
 961
 962    chd_img->header = chd_get_header(chd_img->chd);
 963
 964    chd_img->buffer = malloc(chd_img->header->hunkbytes);
 965    if (chd_img->buffer == NULL)
 966                 goto fail_io;
 967
 968    chd_img->sectors_per_hunk = chd_img->header->hunkbytes / (CD_FRAMESIZE_RAW + SUB_FRAMESIZE);
 969    chd_img->current_hunk = (unsigned int)-1;
 970
 971    cddaBigEndian = TRUE;
 972
 973         numtracks = 0;
 974         memset(ti, 0, sizeof(ti));
 975
 976    while (1)
 977    {
 978       struct {
 979          char type[64];
 980          char subtype[32];
 981          char pgtype[32];
 982          char pgsub[32];
 983          uint32_t track;
 984          uint32_t frames;
 985          uint32_t pregap;
 986          uint32_t postgap;
 987       } md = {};
 988       char meta[256];
 989       uint32_t meta_size = 0;
 990
 991       if (chd_get_metadata(chd_img->chd, CDROM_TRACK_METADATA2_TAG, numtracks, meta, sizeof(meta), &meta_size, NULL, NULL) == CHDERR_NONE)
 992          sscanf(meta, CDROM_TRACK_METADATA2_FORMAT, &md.track, md.type, md.subtype, &md.frames, &md.pregap, md.pgtype, md.pgsub, &md.postgap);
 993       else if (chd_get_metadata(chd_img->chd, CDROM_TRACK_METADATA_TAG, numtracks, meta, sizeof(meta), &meta_size, NULL, NULL) == CHDERR_NONE)
 994          sscanf(meta, CDROM_TRACK_METADATA_FORMAT, &md.track, md.type, md.subtype, &md.frames);
 995       else
 996          break;
 997
 998                 SysPrintf("chd: %s\n", meta);
 999
1000                 if (md.track == 1) {
1001                         if (!strncmp(md.subtype, "RW", 2)) {
1002                                 subChanMixed = TRUE;
1003                                 if (!strcmp(md.subtype, "RW_RAW"))
1004                                         subChanRaw = TRUE;
1005                         }
1006                 }
1007
1008                 ti[md.track].type = !strncmp(md.type, "AUDIO", 5) ? CDDA : DATA;
1009
1010                 sec2msf(frame_offset + md.pregap, ti[md.track].start);
1011                 sec2msf(md.frames, ti[md.track].length);
1012
1013                 ti[md.track].start_offset = file_offset + md.pregap;
1014
1015                 // XXX: what about postgap?
1016                 frame_offset += md.frames;
1017                 file_offset += md.frames;
1018                 numtracks++;
1019         }
1020
1021         if (numtracks)
1022                 return 0;
1023
1024 fail_io:
1025         if (chd_img != NULL) {
1026                 free(chd_img->buffer);
1027                 free(chd_img);
1028                 chd_img = NULL;
1029         }
1030         return -1;
1031 }
1032 #endif
1033
1034 // this function tries to get the .sub file of the given .img
1035 static int opensubfile(const char *isoname) {
1036         char            subname[MAXPATHLEN];
1037
1038         // copy name of the iso and change extension from .img to .sub
1039         strncpy(subname, isoname, sizeof(subname));
1040         subname[MAXPATHLEN - 1] = '\0';
1041         if (strlen(subname) >= 4) {
1042                 strcpy(subname + strlen(subname) - 4, ".sub");
1043         }
1044         else {
1045                 return -1;
1046         }
1047
1048         subHandle = fopen(subname, "rb");
1049         if (subHandle == NULL) {
1050                 return -1;
1051         }
1052
1053         return 0;
1054 }
1055
1056 static int opensbifile(const char *isoname) {
1057         char            sbiname[MAXPATHLEN], disknum[MAXPATHLEN] = "0";
1058         int             s;
1059
1060         strncpy(sbiname, isoname, sizeof(sbiname));
1061         sbiname[MAXPATHLEN - 1] = '\0';
1062         if (strlen(sbiname) >= 4) {
1063                 if (cdrIsoMultidiskCount > 1) {
1064                         sprintf(disknum, "_%i.sbi", cdrIsoMultidiskSelect + 1);
1065                         strcpy(sbiname + strlen(sbiname) - 4, disknum);
1066                 }
1067                 else
1068                         strcpy(sbiname + strlen(sbiname) - 4, ".sbi");
1069         }
1070         else {
1071                 return -1;
1072         }
1073
1074         fseek(cdHandle, 0, SEEK_END);
1075         s = ftell(cdHandle) / 2352;
1076
1077         return LoadSBI(sbiname, s);
1078 }
1079
1080 #ifndef USE_READ_THREAD
1081 static void readThreadStop() {}
1082 static void readThreadStart() {}
1083 #else
1084 static pthread_t read_thread_id;
1085
1086 static pthread_cond_t read_thread_msg_avail;
1087 static pthread_cond_t read_thread_msg_done;
1088 static pthread_mutex_t read_thread_msg_lock;
1089
1090 static pthread_cond_t sectorbuffer_cond;
1091 static pthread_mutex_t sectorbuffer_lock;
1092
1093 static boolean read_thread_running = FALSE;
1094 static int read_thread_sector_start = -1;
1095 static int read_thread_sector_end = -1;
1096
1097 typedef struct {
1098   int sector;
1099   long ret;
1100   unsigned char data[CD_FRAMESIZE_RAW];
1101 } SectorBufferEntry;
1102
1103 #define SECTOR_BUFFER_SIZE 4096
1104
1105 static SectorBufferEntry *sectorbuffer;
1106 static size_t sectorbuffer_index;
1107
1108 int (*sync_cdimg_read_func)(FILE *f, unsigned int base, void *dest, int sector);
1109 unsigned char *(*sync_CDR_getBuffer)(void);
1110
1111 static unsigned char * CALLBACK ISOgetBuffer_async(void);
1112 static int cdread_async(FILE *f, unsigned int base, void *dest, int sector);
1113
1114 static void *readThreadMain(void *param) {
1115   int max_sector = -1;
1116   int requested_sector_start = -1;
1117   int requested_sector_end = -1;
1118   int last_read_sector = -1;
1119   int index = 0;
1120
1121   int ra_sector = -1;
1122   int max_ra = 128;
1123   int initial_ra = 1;
1124   int speedmult_ra = 4;
1125
1126   int ra_count = 0;
1127   int how_far_ahead = 0;
1128
1129   unsigned char tmpdata[CD_FRAMESIZE_RAW];
1130   long ret;
1131
1132   max_sector = msf2sec(ti[numtracks].start) + msf2sec(ti[numtracks].length);
1133
1134   while(1) {
1135     pthread_mutex_lock(&read_thread_msg_lock);
1136
1137     // If we don't have readahead and we don't have a sector request, wait for one.
1138     // If we still have readahead to go, don't block, just keep going.
1139     // And if we ever have a sector request pending, acknowledge and reset it.
1140
1141     if (!ra_count) {
1142       if (read_thread_sector_start == -1 && read_thread_running) {
1143         pthread_cond_wait(&read_thread_msg_avail, &read_thread_msg_lock);
1144       }
1145     }
1146
1147     if (read_thread_sector_start != -1) {
1148       requested_sector_start = read_thread_sector_start;
1149       requested_sector_end = read_thread_sector_end;
1150       read_thread_sector_start = -1;
1151       read_thread_sector_end = -1;
1152       pthread_cond_signal(&read_thread_msg_done);
1153     }
1154
1155     pthread_mutex_unlock(&read_thread_msg_lock);
1156
1157     if (!read_thread_running)
1158       break;
1159
1160     // Readahead code, based on the implementation in mednafen psx's cdromif.cpp
1161     if (requested_sector_start != -1) {
1162       if (last_read_sector != -1 && last_read_sector == (requested_sector_start - 1)) {
1163         how_far_ahead = ra_sector - requested_sector_end;
1164
1165         if(how_far_ahead <= max_ra)
1166           ra_count = (max_ra - how_far_ahead + 1 ? max_ra - how_far_ahead + 1 : speedmult_ra);
1167         else
1168           ra_count++;
1169       } else if (requested_sector_end != last_read_sector) {
1170         ra_sector = requested_sector_end;
1171         ra_count = initial_ra;
1172       }
1173
1174       last_read_sector = requested_sector_end;
1175     }
1176
1177     index = ra_sector % SECTOR_BUFFER_SIZE;
1178
1179     // check for end of CD
1180     if (ra_count && ra_sector >= max_sector) {
1181       ra_count = 0;
1182       pthread_mutex_lock(&sectorbuffer_lock);
1183       sectorbuffer[index].ret = -1;
1184       sectorbuffer[index].sector = ra_sector;
1185       pthread_cond_signal(&sectorbuffer_cond);
1186       pthread_mutex_unlock(&sectorbuffer_lock);
1187     }
1188
1189     if (ra_count) {
1190       pthread_mutex_lock(&sectorbuffer_lock);
1191       if (sectorbuffer[index].sector != ra_sector) {
1192         pthread_mutex_unlock(&sectorbuffer_lock);
1193
1194         ret = sync_cdimg_read_func(cdHandle, 0, tmpdata, ra_sector);
1195
1196         pthread_mutex_lock(&sectorbuffer_lock);
1197         sectorbuffer[index].ret = ret;
1198         sectorbuffer[index].sector = ra_sector;
1199         memcpy(sectorbuffer[index].data, tmpdata, CD_FRAMESIZE_RAW);
1200       }
1201       pthread_cond_signal(&sectorbuffer_cond);
1202       pthread_mutex_unlock(&sectorbuffer_lock);
1203
1204       ra_sector++;
1205       ra_count--;
1206     }
1207   }
1208
1209   return NULL;
1210 }
1211
1212 static void readThreadStop() {
1213   if (read_thread_running == TRUE) {
1214     read_thread_running = FALSE;
1215     pthread_cond_signal(&read_thread_msg_avail);
1216     pthread_join(read_thread_id, NULL);
1217   }
1218
1219   pthread_cond_destroy(&read_thread_msg_done);
1220   pthread_cond_destroy(&read_thread_msg_avail);
1221   pthread_mutex_destroy(&read_thread_msg_lock);
1222
1223   pthread_cond_destroy(&sectorbuffer_cond);
1224   pthread_mutex_destroy(&sectorbuffer_lock);
1225
1226   CDR_getBuffer = sync_CDR_getBuffer;
1227   cdimg_read_func = sync_cdimg_read_func;
1228
1229   free(sectorbuffer);
1230   sectorbuffer = NULL;
1231 }
1232
1233 static void readThreadStart() {
1234   SysPrintf("Starting async CD thread\n");
1235
1236   if (read_thread_running == TRUE)
1237     return;
1238
1239   read_thread_running = TRUE;
1240   read_thread_sector_start = -1;
1241   read_thread_sector_end = -1;
1242   sectorbuffer_index = 0;
1243
1244   sectorbuffer = calloc(SECTOR_BUFFER_SIZE, sizeof(SectorBufferEntry));
1245   if(!sectorbuffer)
1246     goto error;
1247
1248   sectorbuffer[0].sector = -1; // Otherwise we might think we've already fetched sector 0!
1249
1250   sync_CDR_getBuffer = CDR_getBuffer;
1251   CDR_getBuffer = ISOgetBuffer_async;
1252   sync_cdimg_read_func = cdimg_read_func;
1253   cdimg_read_func = cdread_async;
1254
1255   if (pthread_cond_init(&read_thread_msg_avail, NULL) ||
1256       pthread_cond_init(&read_thread_msg_done, NULL) ||
1257       pthread_mutex_init(&read_thread_msg_lock, NULL) ||
1258       pthread_cond_init(&sectorbuffer_cond, NULL) ||
1259       pthread_mutex_init(&sectorbuffer_lock, NULL) ||
1260       pthread_create(&read_thread_id, NULL, readThreadMain, NULL))
1261     goto error;
1262
1263   return;
1264
1265  error:
1266   SysPrintf("Error starting async CD thread\n");
1267   SysPrintf("Falling back to sync\n");
1268
1269   readThreadStop();
1270 }
1271 #endif
1272
1273 static int cdread_normal(FILE *f, unsigned int base, void *dest, int sector)
1274 {
1275         int ret;
1276         if (fseek(f, base + sector * CD_FRAMESIZE_RAW, SEEK_SET))
1277                 goto fail_io;
1278         ret = fread(dest, 1, CD_FRAMESIZE_RAW, f);
1279         if (ret <= 0)
1280                 goto fail_io;
1281         return ret;
1282
1283 fail_io:
1284         // often happens in cdda gaps of a split cue/bin, so not logged
1285         //SysPrintf("File IO error %d, base %u, sector %u\n", errno, base, sector);
1286         return -1;
1287 }
1288
1289 static int cdread_sub_mixed(FILE *f, unsigned int base, void *dest, int sector)
1290 {
1291         int ret;
1292
1293         if (fseek(f, base + sector * (CD_FRAMESIZE_RAW + SUB_FRAMESIZE), SEEK_SET))
1294                 goto fail_io;
1295         ret = fread(dest, 1, CD_FRAMESIZE_RAW, f);
1296         if (ret <= 0)
1297                 goto fail_io;
1298         return ret;
1299
1300 fail_io:
1301         //SysPrintf("File IO error %d, base %u, sector %u\n", errno, base, sector);
1302         return -1;
1303 }
1304
1305 static int cdread_sub_sub_mixed(FILE *f, int sector)
1306 {
1307         if (fseek(f, sector * (CD_FRAMESIZE_RAW + SUB_FRAMESIZE) + CD_FRAMESIZE_RAW, SEEK_SET))
1308                 goto fail_io;
1309         if (fread(subbuffer, 1, SUB_FRAMESIZE, f) != SUB_FRAMESIZE)
1310                 goto fail_io;
1311
1312         return SUB_FRAMESIZE;
1313
1314 fail_io:
1315         SysPrintf("subchannel: file IO error %d, sector %u\n", errno, sector);
1316         return -1;
1317 }
1318
1319 static int uncompress2_pcsx(void *out, unsigned long *out_size, void *in, unsigned long in_size)
1320 {
1321         static z_stream z;
1322         int ret = 0;
1323
1324         if (z.zalloc == NULL) {
1325                 // XXX: one-time leak here..
1326                 z.next_in = Z_NULL;
1327                 z.avail_in = 0;
1328                 z.zalloc = Z_NULL;
1329                 z.zfree = Z_NULL;
1330                 z.opaque = Z_NULL;
1331                 ret = inflateInit2(&z, -15);
1332         }
1333         else
1334                 ret = inflateReset(&z);
1335         if (ret != Z_OK)
1336                 return ret;
1337
1338         z.next_in = in;
1339         z.avail_in = in_size;
1340         z.next_out = out;
1341         z.avail_out = *out_size;
1342
1343         ret = inflate(&z, Z_NO_FLUSH);
1344         //inflateEnd(&z);
1345
1346         *out_size -= z.avail_out;
1347         return ret == 1 ? 0 : ret;
1348 }
1349
1350 static int cdread_compressed(FILE *f, unsigned int base, void *dest, int sector)
1351 {
1352         unsigned long cdbuffer_size, cdbuffer_size_expect;
1353         unsigned int size;
1354         int is_compressed;
1355         off_t start_byte;
1356         int ret, block;
1357
1358         if (base)
1359                 sector += base / 2352;
1360
1361         block = sector >> compr_img->block_shift;
1362         compr_img->sector_in_blk = sector & ((1 << compr_img->block_shift) - 1);
1363
1364         if (block == compr_img->current_block) {
1365                 //printf("hit sect %d\n", sector);
1366                 goto finish;
1367         }
1368
1369         if (sector >= compr_img->index_len * 16) {
1370                 SysPrintf("sector %d is past img end\n", sector);
1371                 return -1;
1372         }
1373
1374         start_byte = compr_img->index_table[block] & ~OFF_T_MSB;
1375         if (fseeko(cdHandle, start_byte, SEEK_SET) != 0) {
1376                 SysPrintf("seek error for block %d at %llx: ",
1377                         block, (long long)start_byte);
1378                 perror(NULL);
1379                 return -1;
1380         }
1381
1382         is_compressed = !(compr_img->index_table[block] & OFF_T_MSB);
1383         size = (compr_img->index_table[block + 1] & ~OFF_T_MSB) - start_byte;
1384         if (size > sizeof(compr_img->buff_compressed)) {
1385                 SysPrintf("block %d is too large: %u\n", block, size);
1386                 return -1;
1387         }
1388
1389         if (fread(is_compressed ? compr_img->buff_compressed : compr_img->buff_raw[0],
1390                                 1, size, cdHandle) != size) {
1391                 SysPrintf("read error for block %d at %x: ", block, start_byte);
1392                 perror(NULL);
1393                 return -1;
1394         }
1395
1396         if (is_compressed) {
1397                 cdbuffer_size_expect = sizeof(compr_img->buff_raw[0]) << compr_img->block_shift;
1398                 cdbuffer_size = cdbuffer_size_expect;
1399                 ret = uncompress2_pcsx(compr_img->buff_raw[0], &cdbuffer_size, compr_img->buff_compressed, size);
1400                 if (ret != 0) {
1401                         SysPrintf("uncompress failed with %d for block %d, sector %d\n",
1402                                         ret, block, sector);
1403                         return -1;
1404                 }
1405                 if (cdbuffer_size != cdbuffer_size_expect)
1406                         SysPrintf("cdbuffer_size: %lu != %lu, sector %d\n", cdbuffer_size,
1407                                         cdbuffer_size_expect, sector);
1408         }
1409
1410         // done at last!
1411         compr_img->current_block = block;
1412
1413 finish:
1414         if (dest != cdbuffer) // copy avoid HACK
1415                 memcpy(dest, compr_img->buff_raw[compr_img->sector_in_blk],
1416                         CD_FRAMESIZE_RAW);
1417         return CD_FRAMESIZE_RAW;
1418 }
1419
1420 #ifdef HAVE_CHD
1421 static int cdread_chd(FILE *f, unsigned int base, void *dest, int sector)
1422 {
1423         int hunk;
1424
1425         sector += base;
1426
1427         hunk = sector / chd_img->sectors_per_hunk;
1428         chd_img->sector_in_hunk = sector % chd_img->sectors_per_hunk;
1429
1430         if (hunk != chd_img->current_hunk)
1431         {
1432                 chd_read(chd_img->chd, hunk, chd_img->buffer);
1433                 chd_img->current_hunk = hunk;
1434         }
1435
1436         if (dest != cdbuffer) // copy avoid HACK
1437                 memcpy(dest, chd_img->buffer[chd_img->sector_in_hunk],
1438                         CD_FRAMESIZE_RAW);
1439         return CD_FRAMESIZE_RAW;
1440 }
1441
1442 static int cdread_sub_chd(FILE *f, int sector)
1443 {
1444         int hunk;
1445
1446         if (!subChanMixed)
1447                 return -1;
1448
1449         hunk = sector / chd_img->sectors_per_hunk;
1450         chd_img->sector_in_hunk = sector % chd_img->sectors_per_hunk;
1451
1452         if (hunk != chd_img->current_hunk)
1453         {
1454                 chd_read(chd_img->chd, hunk, chd_img->buffer);
1455                 chd_img->current_hunk = hunk;
1456         }
1457
1458         memcpy(subbuffer, chd_img->buffer[chd_img->sector_in_hunk] + CD_FRAMESIZE_RAW, SUB_FRAMESIZE);
1459         return SUB_FRAMESIZE;
1460 }
1461 #endif
1462
1463 static int cdread_2048(FILE *f, unsigned int base, void *dest, int sector)
1464 {
1465         int ret;
1466
1467         fseek(f, base + sector * 2048, SEEK_SET);
1468         ret = fread((char *)dest + 12 * 2, 1, 2048, f);
1469
1470         // not really necessary, fake mode 2 header
1471         memset(cdbuffer, 0, 12 * 2);
1472         sec2msf(sector + 2 * 75, (char *)&cdbuffer[12]);
1473         cdbuffer[12 + 3] = 1;
1474
1475         return 12*2 + ret;
1476 }
1477
1478 #ifdef USE_READ_THREAD
1479
1480 static int cdread_async(FILE *f, unsigned int base, void *dest, int sector) {
1481   boolean found = FALSE;
1482   int i = sector % SECTOR_BUFFER_SIZE;
1483   long ret;
1484
1485   if (f != cdHandle || base != 0 || dest != cdbuffer) {
1486     // Async reads are only supported for cdbuffer, so call the sync
1487     // function directly.
1488     return sync_cdimg_read_func(f, base, dest, sector);
1489   }
1490
1491   pthread_mutex_lock(&read_thread_msg_lock);
1492
1493   // Only wait if we're not trying to read the next sector and
1494   // sector_start is set (meaning the last request hasn't been
1495   // processed yet)
1496   while(read_thread_sector_start != -1 && read_thread_sector_end + 1 != sector) {
1497     pthread_cond_wait(&read_thread_msg_done, &read_thread_msg_lock);
1498   }
1499
1500   if (read_thread_sector_start == -1)
1501     read_thread_sector_start = sector;
1502
1503   read_thread_sector_end = sector;
1504   pthread_cond_signal(&read_thread_msg_avail);
1505   pthread_mutex_unlock(&read_thread_msg_lock);
1506
1507   do {
1508     pthread_mutex_lock(&sectorbuffer_lock);
1509     if (sectorbuffer[i].sector == sector) {
1510       sectorbuffer_index = i;
1511       ret = sectorbuffer[i].ret;
1512       found = TRUE;
1513     }
1514
1515     if (!found) {
1516       pthread_cond_wait(&sectorbuffer_cond, &sectorbuffer_lock);
1517     }
1518     pthread_mutex_unlock(&sectorbuffer_lock);
1519   } while (!found);
1520
1521   return ret;
1522 }
1523
1524 #endif
1525
1526 static unsigned char * CALLBACK ISOgetBuffer_compr(void) {
1527         return compr_img->buff_raw[compr_img->sector_in_blk] + 12;
1528 }
1529
1530 #ifdef HAVE_CHD
1531 static unsigned char * CALLBACK ISOgetBuffer_chd(void) {
1532         return chd_img->buffer[chd_img->sector_in_hunk] + 12;
1533 }
1534 #endif
1535
1536 #ifdef USE_READ_THREAD
1537 static unsigned char * CALLBACK ISOgetBuffer_async(void) {
1538   unsigned char *buffer;
1539   pthread_mutex_lock(&sectorbuffer_lock);
1540   buffer = sectorbuffer[sectorbuffer_index].data;
1541   pthread_mutex_unlock(&sectorbuffer_lock);
1542   return buffer + 12;
1543 }
1544
1545 #endif
1546
1547 static unsigned char * CALLBACK ISOgetBuffer(void) {
1548         return cdbuffer + 12;
1549 }
1550
1551 static void PrintTracks(void) {
1552         int i;
1553
1554         for (i = 1; i <= numtracks; i++) {
1555                 SysPrintf(_("Track %.2d (%s) - Start %.2d:%.2d:%.2d, Length %.2d:%.2d:%.2d\n"),
1556                         i, (ti[i].type == DATA ? "DATA" : "AUDIO"),
1557                         ti[i].start[0], ti[i].start[1], ti[i].start[2],
1558                         ti[i].length[0], ti[i].length[1], ti[i].length[2]);
1559         }
1560 }
1561
1562 // This function is invoked by the front-end when opening an ISO
1563 // file for playback
1564 static long CALLBACK ISOopen(void) {
1565         boolean isMode1ISO = FALSE;
1566         char alt_bin_filename[MAXPATHLEN];
1567         const char *bin_filename;
1568         char image_str[1024];
1569         int is_chd = 0;
1570
1571         if (cdHandle != NULL) {
1572                 return 0; // it's already open
1573         }
1574
1575         cdHandle = fopen(GetIsoFile(), "rb");
1576         if (cdHandle == NULL) {
1577                 SysPrintf(_("Could't open '%s' for reading: %s\n"),
1578                         GetIsoFile(), strerror(errno));
1579                 return -1;
1580         }
1581
1582         snprintf(image_str, sizeof(image_str) - 6*4 - 1,
1583                 "Loaded CD Image: %s", GetIsoFile());
1584
1585         cddaBigEndian = FALSE;
1586         subChanMixed = FALSE;
1587         subChanRaw = FALSE;
1588         pregapOffset = 0;
1589         cdrIsoMultidiskCount = 1;
1590         multifile = 0;
1591
1592         CDR_getBuffer = ISOgetBuffer;
1593         cdimg_read_func = cdread_normal;
1594         cdimg_read_sub_func = NULL;
1595
1596         if (parsetoc(GetIsoFile()) == 0) {
1597                 strcat(image_str, "[+toc]");
1598         }
1599         else if (parseccd(GetIsoFile()) == 0) {
1600                 strcat(image_str, "[+ccd]");
1601         }
1602         else if (parsemds(GetIsoFile()) == 0) {
1603                 strcat(image_str, "[+mds]");
1604         }
1605         else if (parsecue(GetIsoFile()) == 0) {
1606                 strcat(image_str, "[+cue]");
1607         }
1608         if (handlepbp(GetIsoFile()) == 0) {
1609                 strcat(image_str, "[+pbp]");
1610                 CDR_getBuffer = ISOgetBuffer_compr;
1611                 cdimg_read_func = cdread_compressed;
1612         }
1613         else if (handlecbin(GetIsoFile()) == 0) {
1614                 strcat(image_str, "[+cbin]");
1615                 CDR_getBuffer = ISOgetBuffer_compr;
1616                 cdimg_read_func = cdread_compressed;
1617         }
1618 #ifdef HAVE_CHD
1619         else if (handlechd(GetIsoFile()) == 0) {
1620                 strcat(image_str, "[+chd]");
1621                 CDR_getBuffer = ISOgetBuffer_chd;
1622                 cdimg_read_func = cdread_chd;
1623                 cdimg_read_sub_func = cdread_sub_chd;
1624                 is_chd = 1;
1625         }
1626 #endif
1627
1628         if (!subChanMixed && opensubfile(GetIsoFile()) == 0) {
1629                 strcat(image_str, "[+sub]");
1630         }
1631         if (opensbifile(GetIsoFile()) == 0) {
1632                 strcat(image_str, "[+sbi]");
1633         }
1634
1635         fseeko(cdHandle, 0, SEEK_END);
1636
1637         // maybe user selected metadata file instead of main .bin ..
1638         bin_filename = GetIsoFile();
1639         if (ftello(cdHandle) < 2352 * 0x10) {
1640                 static const char *exts[] = { ".bin", ".BIN", ".img", ".IMG" };
1641                 FILE *tmpf = NULL;
1642                 size_t i;
1643                 char *p;
1644
1645                 strncpy(alt_bin_filename, bin_filename, sizeof(alt_bin_filename));
1646                 alt_bin_filename[MAXPATHLEN - 1] = '\0';
1647                 if (strlen(alt_bin_filename) >= 4) {
1648                         p = alt_bin_filename + strlen(alt_bin_filename) - 4;
1649                         for (i = 0; i < sizeof(exts) / sizeof(exts[0]); i++) {
1650                                 strcpy(p, exts[i]);
1651                                 tmpf = fopen(alt_bin_filename, "rb");
1652                                 if (tmpf != NULL)
1653                                         break;
1654                         }
1655                 }
1656                 if (tmpf != NULL) {
1657                         bin_filename = alt_bin_filename;
1658                         fclose(cdHandle);
1659                         cdHandle = tmpf;
1660                         fseeko(cdHandle, 0, SEEK_END);
1661                 }
1662         }
1663
1664         // guess whether it is mode1/2048
1665         if (ftello(cdHandle) % 2048 == 0) {
1666                 unsigned int modeTest = 0;
1667                 fseek(cdHandle, 0, SEEK_SET);
1668                 if (!fread(&modeTest, sizeof(modeTest), 1, cdHandle)) {
1669 #ifndef NDEBUG
1670                         SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
1671 #endif
1672                         return -1;
1673                 }
1674                 if (SWAP32(modeTest) != 0xffffff00) {
1675                         strcat(image_str, "[2048]");
1676                         isMode1ISO = TRUE;
1677                 }
1678         }
1679         fseek(cdHandle, 0, SEEK_SET);
1680
1681         SysPrintf("%s.\n", image_str);
1682
1683         PrintTracks();
1684
1685         if (subChanMixed && !is_chd) {
1686                 cdimg_read_func = cdread_sub_mixed;
1687                 cdimg_read_sub_func = cdread_sub_sub_mixed;
1688         }
1689         else if (isMode1ISO) {
1690                 cdimg_read_func = cdread_2048;
1691                 cdimg_read_sub_func = NULL;
1692         }
1693
1694         // make sure we have another handle open for cdda
1695         if (numtracks > 1 && ti[1].handle == NULL) {
1696                 ti[1].handle = fopen(bin_filename, "rb");
1697         }
1698
1699   if (Config.AsyncCD) {
1700     readThreadStart();
1701   }
1702         return 0;
1703 }
1704
1705 static long CALLBACK ISOclose(void) {
1706         int i;
1707
1708         if (cdHandle != NULL) {
1709                 fclose(cdHandle);
1710                 cdHandle = NULL;
1711         }
1712         if (subHandle != NULL) {
1713                 fclose(subHandle);
1714                 subHandle = NULL;
1715         }
1716         playing = FALSE;
1717         cddaHandle = NULL;
1718
1719         if (compr_img != NULL) {
1720                 free(compr_img->index_table);
1721                 free(compr_img);
1722                 compr_img = NULL;
1723         }
1724
1725 #ifdef HAVE_CHD
1726         if (chd_img != NULL) {
1727                 chd_close(chd_img->chd);
1728                 free(chd_img->buffer);
1729                 free(chd_img);
1730                 chd_img = NULL;
1731         }
1732 #endif
1733
1734         for (i = 1; i <= numtracks; i++) {
1735                 if (ti[i].handle != NULL) {
1736                         fclose(ti[i].handle);
1737                         ti[i].handle = NULL;
1738                 }
1739         }
1740         numtracks = 0;
1741         ti[1].type = 0;
1742         UnloadSBI();
1743
1744         memset(cdbuffer, 0, sizeof(cdbuffer));
1745         CDR_getBuffer = ISOgetBuffer;
1746
1747         if (Config.AsyncCD) {
1748                 readThreadStop();
1749         }
1750
1751         return 0;
1752 }
1753
1754 static long CALLBACK ISOinit(void) {
1755         assert(cdHandle == NULL);
1756         assert(subHandle == NULL);
1757
1758         return 0; // do nothing
1759 }
1760
1761 static long CALLBACK ISOshutdown(void) {
1762         ISOclose();
1763         return 0;
1764 }
1765
1766 // return Starting and Ending Track
1767 // buffer:
1768 //  byte 0 - start track
1769 //  byte 1 - end track
1770 static long CALLBACK ISOgetTN(unsigned char *buffer) {
1771         buffer[0] = 1;
1772
1773         if (numtracks > 0) {
1774                 buffer[1] = numtracks;
1775         }
1776         else {
1777                 buffer[1] = 1;
1778         }
1779
1780         return 0;
1781 }
1782
1783 // return Track Time
1784 // buffer:
1785 //  byte 0 - frame
1786 //  byte 1 - second
1787 //  byte 2 - minute
1788 static long CALLBACK ISOgetTD(unsigned char track, unsigned char *buffer) {
1789         if (track == 0) {
1790                 unsigned int sect;
1791                 unsigned char time[3];
1792                 sect = msf2sec(ti[numtracks].start) + msf2sec(ti[numtracks].length);
1793                 sec2msf(sect, (char *)time);
1794                 buffer[2] = time[0];
1795                 buffer[1] = time[1];
1796                 buffer[0] = time[2];
1797         }
1798         else if (numtracks > 0 && track <= numtracks) {
1799                 buffer[2] = ti[track].start[0];
1800                 buffer[1] = ti[track].start[1];
1801                 buffer[0] = ti[track].start[2];
1802         }
1803         else {
1804                 buffer[2] = 0;
1805                 buffer[1] = 2;
1806                 buffer[0] = 0;
1807         }
1808
1809         return 0;
1810 }
1811
1812 // decode 'raw' subchannel data ripped by cdrdao
1813 static void DecodeRawSubData(void) {
1814         unsigned char subQData[12];
1815         int i;
1816
1817         memset(subQData, 0, sizeof(subQData));
1818
1819         for (i = 0; i < 8 * 12; i++) {
1820                 if (subbuffer[i] & (1 << 6)) { // only subchannel Q is needed
1821                         subQData[i >> 3] |= (1 << (7 - (i & 7)));
1822                 }
1823         }
1824
1825         memcpy(&subbuffer[12], subQData, 12);
1826 }
1827
1828 // read track
1829 // time: byte 0 - minute; byte 1 - second; byte 2 - frame
1830 // uses bcd format
1831 static boolean CALLBACK ISOreadTrack(unsigned char *time) {
1832         int sector = MSF2SECT(btoi(time[0]), btoi(time[1]), btoi(time[2]));
1833         long ret;
1834
1835         if (cdHandle == NULL) {
1836                 return 0;
1837         }
1838
1839         if (pregapOffset && sector >= pregapOffset)
1840                 sector -= 2 * 75;
1841
1842         ret = cdimg_read_func(cdHandle, 0, cdbuffer, sector);
1843         if (ret < 12*2 + 2048)
1844                 return 0;
1845
1846         return 1;
1847 }
1848
1849 // plays cdda audio
1850 // sector: byte 0 - minute; byte 1 - second; byte 2 - frame
1851 // does NOT uses bcd format
1852 static long CALLBACK ISOplay(unsigned char *time) {
1853         playing = TRUE;
1854         return 0;
1855 }
1856
1857 // stops cdda audio
1858 static long CALLBACK ISOstop(void) {
1859         playing = FALSE;
1860         return 0;
1861 }
1862
1863 // gets subchannel data
1864 static unsigned char* CALLBACK ISOgetBufferSub(int sector) {
1865         if (pregapOffset && sector >= pregapOffset) {
1866                 sector -= 2 * 75;
1867                 if (sector < pregapOffset) // ?
1868                         return NULL;
1869         }
1870
1871         if (cdimg_read_sub_func != NULL) {
1872                 if (cdimg_read_sub_func(cdHandle, sector) != SUB_FRAMESIZE)
1873                         return NULL;
1874         }
1875         else if (subHandle != NULL) {
1876                 if (fseek(subHandle, sector * SUB_FRAMESIZE, SEEK_SET))
1877                         return NULL;
1878                 if (fread(subbuffer, 1, SUB_FRAMESIZE, subHandle) != SUB_FRAMESIZE)
1879                         return NULL;
1880         }
1881         else {
1882                 return NULL;
1883         }
1884
1885         if (subChanRaw) DecodeRawSubData();
1886         return subbuffer;
1887 }
1888
1889 static long CALLBACK ISOgetStatus(struct CdrStat *stat) {
1890         u32 sect;
1891
1892         CDR__getStatus(stat);
1893
1894         if (playing) {
1895                 stat->Type = 0x02;
1896                 stat->Status |= 0x80;
1897         }
1898         else {
1899                 // BIOS - boot ID (CD type)
1900                 stat->Type = ti[1].type;
1901         }
1902
1903         // relative -> absolute time
1904         sect = cddaCurPos;
1905         sec2msf(sect, (char *)stat->Time);
1906
1907         return 0;
1908 }
1909
1910 // read CDDA sector into buffer
1911 long CALLBACK ISOreadCDDA(unsigned char m, unsigned char s, unsigned char f, unsigned char *buffer) {
1912         unsigned char msf[3] = {m, s, f};
1913         unsigned int file, track, track_start = 0;
1914         int ret;
1915
1916         cddaCurPos = msf2sec((char *)msf);
1917
1918         // find current track index
1919         for (track = numtracks; ; track--) {
1920                 track_start = msf2sec(ti[track].start);
1921                 if (track_start <= cddaCurPos)
1922                         break;
1923                 if (track == 1)
1924                         break;
1925         }
1926
1927         // data tracks play silent
1928         if (ti[track].type != CDDA) {
1929                 memset(buffer, 0, CD_FRAMESIZE_RAW);
1930                 return 0;
1931         }
1932
1933         file = 1;
1934         if (multifile) {
1935                 // find the file that contains this track
1936                 for (file = track; file > 1; file--)
1937                         if (ti[file].handle != NULL)
1938                                 break;
1939         }
1940
1941         ret = cdimg_read_func(ti[file].handle, ti[track].start_offset,
1942                 buffer, cddaCurPos - track_start);
1943         if (ret != CD_FRAMESIZE_RAW) {
1944                 memset(buffer, 0, CD_FRAMESIZE_RAW);
1945                 return -1;
1946         }
1947
1948         if (cddaBigEndian) {
1949                 int i;
1950                 unsigned char tmp;
1951
1952                 for (i = 0; i < CD_FRAMESIZE_RAW / 2; i++) {
1953                         tmp = buffer[i * 2];
1954                         buffer[i * 2] = buffer[i * 2 + 1];
1955                         buffer[i * 2 + 1] = tmp;
1956                 }
1957         }
1958
1959         return 0;
1960 }
1961
1962 void cdrIsoInit(void) {
1963         CDR_init = ISOinit;
1964         CDR_shutdown = ISOshutdown;
1965         CDR_open = ISOopen;
1966         CDR_close = ISOclose;
1967         CDR_getTN = ISOgetTN;
1968         CDR_getTD = ISOgetTD;
1969         CDR_readTrack = ISOreadTrack;
1970         CDR_getBuffer = ISOgetBuffer;
1971         CDR_play = ISOplay;
1972         CDR_stop = ISOstop;
1973         CDR_getBufferSub = ISOgetBufferSub;
1974         CDR_getStatus = ISOgetStatus;
1975         CDR_readCDDA = ISOreadCDDA;
1976
1977         CDR_getDriveLetter = CDR__getDriveLetter;
1978         CDR_configure = CDR__configure;
1979         CDR_test = CDR__test;
1980         CDR_about = CDR__about;
1981         CDR_setfilename = CDR__setfilename;
1982
1983         numtracks = 0;
1984 }
1985
1986 int cdrIsoActive(void) {
1987         return (cdHandle != NULL);
1988 }