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 #elif HAVE_PTHREAD
  40 #include <pthread.h>
  41 #include <sys/time.h>
  42 #include <unistd.h>
  43 #endif
  44
  45 // to enable the USE_READ_THREAD code, fix:
  46 // - https://github.com/notaz/pcsx_rearmed/issues/257
  47 // - ISOgetBufferSub to not race with async code
  48 #define USE_READ_THREAD 0 //HAVE_PTHREAD
  49
  50 #ifdef USE_LIBRETRO_VFS
  51 #include <streams/file_stream_transforms.h>
  52 #undef fseeko
  53 #undef ftello
  54 #define ftello rftell
  55 #define fseeko rfseek
  56 #endif
  57
  58 #define OFF_T_MSB ((off_t)1 << (sizeof(off_t) * 8 - 1))
  59
  60 unsigned int cdrIsoMultidiskCount;
  61 unsigned int cdrIsoMultidiskSelect;
  62
  63 static FILE *cdHandle = NULL;
  64 static FILE *cddaHandle = NULL;
  65 static FILE *subHandle = NULL;
  66
  67 static boolean subChanMixed = FALSE;
  68 static boolean subChanRaw = FALSE;
  69
  70 static boolean multifile = FALSE;
  71
  72 static unsigned char cdbuffer[CD_FRAMESIZE_RAW];
  73 static unsigned char subbuffer[SUB_FRAMESIZE];
  74
  75 static boolean playing = FALSE;
  76 static boolean cddaBigEndian = FALSE;
  77 /* Frame offset into CD image where pregap data would be found if it was there.
  78  * If a game seeks there we must *not* return subchannel data since it's
  79  * not in the CD image, so that cdrom code can fake subchannel data instead.
  80  * XXX: there could be multiple pregaps but PSX dumps only have one? */
  81 static unsigned int pregapOffset;
  82
  83 static unsigned int cddaCurPos;
  84
  85 // compressed image stuff
  86 static struct {
  87         unsigned char buff_raw[16][CD_FRAMESIZE_RAW];
  88         unsigned char buff_compressed[CD_FRAMESIZE_RAW * 16 + 100];
  89         off_t *index_table;
  90         unsigned int index_len;
  91         unsigned int block_shift;
  92         unsigned int current_block;
  93         unsigned int sector_in_blk;
  94 } *compr_img;
  95
  96 #ifdef HAVE_CHD
  97 static struct {
  98         unsigned char *buffer;
  99         chd_file* chd;
 100         const chd_header* header;
 101         unsigned int sectors_per_hunk;
 102         unsigned int current_hunk[2];
 103         unsigned int current_buffer;
 104         unsigned int sector_in_hunk;
 105 } *chd_img;
 106 #endif
 107
 108 static int (*cdimg_read_func)(FILE *f, unsigned int base, void *dest, int sector);
 109 static int (*cdimg_read_sub_func)(FILE *f, int sector);
 110
 111 char* CALLBACK CDR__getDriveLetter(void);
 112 long CALLBACK CDR__configure(void);
 113 long CALLBACK CDR__test(void);
 114 void CALLBACK CDR__about(void);
 115 long CALLBACK CDR__setfilename(char *filename);
 116 long CALLBACK CDR__getStatus(struct CdrStat *stat);
 117
 118 static void DecodeRawSubData(void);
 119
 120 struct trackinfo {
 121         enum {DATA=1, CDDA} type;
 122         char start[3];          // MSF-format
 123         char length[3];         // MSF-format
 124         FILE *handle;           // for multi-track images CDDA
 125         unsigned int start_offset; // byte offset from start of above file (chd: sector offset)
 126 };
 127
 128 #define MAXTRACKS 100 /* How many tracks can a CD hold? */
 129
 130 static int numtracks = 0;
 131 static struct trackinfo ti[MAXTRACKS];
 132
 133 // get a sector from a msf-array
 134 static unsigned int msf2sec(char *msf) {
 135         return ((msf[0] * 60 + msf[1]) * 75) + msf[2];
 136 }
 137
 138 static void sec2msf(unsigned int s, char *msf) {
 139         msf[0] = s / 75 / 60;
 140         s = s - msf[0] * 75 * 60;
 141         msf[1] = s / 75;
 142         s = s - msf[1] * 75;
 143         msf[2] = s;
 144 }
 145
 146 // divide a string of xx:yy:zz into m, s, f
 147 static void tok2msf(char *time, char *msf) {
 148         char *token;
 149
 150         token = strtok(time, ":");
 151         if (token) {
 152                 msf[0] = atoi(token);
 153         }
 154         else {
 155                 msf[0] = 0;
 156         }
 157
 158         token = strtok(NULL, ":");
 159         if (token) {
 160                 msf[1] = atoi(token);
 161         }
 162         else {
 163                 msf[1] = 0;
 164         }
 165
 166         token = strtok(NULL, ":");
 167         if (token) {
 168                 msf[2] = atoi(token);
 169         }
 170         else {
 171                 msf[2] = 0;
 172         }
 173 }
 174
 175 // this function tries to get the .toc file of the given .bin
 176 // the necessary data is put into the ti (trackinformation)-array
 177 static int parsetoc(const char *isofile) {
 178         char                    tocname[MAXPATHLEN];
 179         FILE                    *fi;
 180         char                    linebuf[256], tmp[256], name[256];
 181         char                    *token;
 182         char                    time[20], time2[20];
 183         unsigned int    t, sector_offs, sector_size;
 184         unsigned int    current_zero_gap = 0;
 185
 186         numtracks = 0;
 187
 188         // copy name of the iso and change extension from .bin to .toc
 189         strncpy(tocname, isofile, sizeof(tocname));
 190         tocname[MAXPATHLEN - 1] = '\0';
 191         if (strlen(tocname) >= 4) {
 192                 strcpy(tocname + strlen(tocname) - 4, ".toc");
 193         }
 194         else {
 195                 return -1;
 196         }
 197
 198         if ((fi = fopen(tocname, "r")) == NULL) {
 199                 // try changing extension to .cue (to satisfy some stupid tutorials)
 200                 strcpy(tocname + strlen(tocname) - 4, ".cue");
 201                 if ((fi = fopen(tocname, "r")) == NULL) {
 202                         // if filename is image.toc.bin, try removing .bin (for Brasero)
 203                         strcpy(tocname, isofile);
 204                         t = strlen(tocname);
 205                         if (t >= 8 && strcmp(tocname + t - 8, ".toc.bin") == 0) {
 206                                 tocname[t - 4] = '\0';
 207                                 if ((fi = fopen(tocname, "r")) == NULL) {
 208                                         return -1;
 209                                 }
 210                         }
 211                         else {
 212                                 return -1;
 213                         }
 214                 }
 215                 // check if it's really a TOC named as a .cue
 216                 if (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 217                         token = strtok(linebuf, " ");
 218                         if (token && strncmp(token, "CD", 2) != 0 && strcmp(token, "CATALOG") != 0) {
 219                                 fclose(fi);
 220                                 return -1;
 221                         }
 222                 }
 223                 fseek(fi, 0, SEEK_SET);
 224         }
 225
 226         memset(&ti, 0, sizeof(ti));
 227         cddaBigEndian = TRUE; // cdrdao uses big-endian for CD Audio
 228
 229         sector_size = CD_FRAMESIZE_RAW;
 230         sector_offs = 2 * 75;
 231
 232         // parse the .toc file
 233         while (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 234                 // search for tracks
 235                 strncpy(tmp, linebuf, sizeof(linebuf));
 236                 token = strtok(tmp, " ");
 237
 238                 if (token == NULL) continue;
 239
 240                 if (!strcmp(token, "TRACK")) {
 241                         sector_offs += current_zero_gap;
 242                         current_zero_gap = 0;
 243
 244                         // get type of track
 245                         token = strtok(NULL, " ");
 246                         numtracks++;
 247
 248                         if (!strncmp(token, "MODE2_RAW", 9)) {
 249                                 ti[numtracks].type = DATA;
 250                                 sec2msf(2 * 75, ti[numtracks].start); // assume data track on 0:2:0
 251
 252                                 // check if this image contains mixed subchannel data
 253                                 token = strtok(NULL, " ");
 254                                 if (token != NULL && !strncmp(token, "RW", 2)) {
 255                                         sector_size = CD_FRAMESIZE_RAW + SUB_FRAMESIZE;
 256                                         subChanMixed = TRUE;
 257                                         if (!strncmp(token, "RW_RAW", 6))
 258                                                 subChanRaw = TRUE;
 259                                 }
 260                         }
 261                         else if (!strncmp(token, "AUDIO", 5)) {
 262                                 ti[numtracks].type = CDDA;
 263                         }
 264                 }
 265                 else if (!strcmp(token, "DATAFILE")) {
 266                         if (ti[numtracks].type == CDDA) {
 267                                 sscanf(linebuf, "DATAFILE \"%[^\"]\" #%d %8s", name, &t, time2);
 268                                 ti[numtracks].start_offset = t;
 269                                 t = t / sector_size + sector_offs;
 270                                 sec2msf(t, (char *)&ti[numtracks].start);
 271                                 tok2msf((char *)&time2, (char *)&ti[numtracks].length);
 272                         }
 273                         else {
 274                                 sscanf(linebuf, "DATAFILE \"%[^\"]\" %8s", name, time);
 275                                 tok2msf((char *)&time, (char *)&ti[numtracks].length);
 276                         }
 277                 }
 278                 else if (!strcmp(token, "FILE")) {
 279                         sscanf(linebuf, "FILE \"%[^\"]\" #%d %8s %8s", name, &t, time, time2);
 280                         tok2msf((char *)&time, (char *)&ti[numtracks].start);
 281                         t += msf2sec(ti[numtracks].start) * sector_size;
 282                         ti[numtracks].start_offset = t;
 283                         t = t / sector_size + sector_offs;
 284                         sec2msf(t, (char *)&ti[numtracks].start);
 285                         tok2msf((char *)&time2, (char *)&ti[numtracks].length);
 286                 }
 287                 else if (!strcmp(token, "ZERO") || !strcmp(token, "SILENCE")) {
 288                         // skip unneeded optional fields
 289                         while (token != NULL) {
 290                                 token = strtok(NULL, " ");
 291                                 if (strchr(token, ':') != NULL)
 292                                         break;
 293                         }
 294                         if (token != NULL) {
 295                                 tok2msf(token, tmp);
 296                                 current_zero_gap = msf2sec(tmp);
 297                         }
 298                         if (numtracks > 1) {
 299                                 t = ti[numtracks - 1].start_offset;
 300                                 t /= sector_size;
 301                                 pregapOffset = t + msf2sec(ti[numtracks - 1].length);
 302                         }
 303                 }
 304                 else if (!strcmp(token, "START")) {
 305                         token = strtok(NULL, " ");
 306                         if (token != NULL && strchr(token, ':')) {
 307                                 tok2msf(token, tmp);
 308                                 t = msf2sec(tmp);
 309                                 ti[numtracks].start_offset += (t - current_zero_gap) * sector_size;
 310                                 t = msf2sec(ti[numtracks].start) + t;
 311                                 sec2msf(t, (char *)&ti[numtracks].start);
 312                         }
 313                 }
 314         }
 315
 316         fclose(fi);
 317
 318         return 0;
 319 }
 320
 321 // this function tries to get the .cue file of the given .bin
 322 // the necessary data is put into the ti (trackinformation)-array
 323 static int parsecue(const char *isofile) {
 324         char                    cuename[MAXPATHLEN];
 325         char                    filepath[MAXPATHLEN];
 326         char                    *incue_fname;
 327         FILE                    *fi;
 328         char                    *token;
 329         char                    time[20];
 330         char                    *tmp;
 331         char                    linebuf[256], tmpb[256], dummy[256];
 332         unsigned int    incue_max_len;
 333         unsigned int    t, file_len, mode, sector_offs;
 334         unsigned int    sector_size = 2352;
 335
 336         numtracks = 0;
 337
 338         // copy name of the iso and change extension from .bin to .cue
 339         strncpy(cuename, isofile, sizeof(cuename));
 340         cuename[MAXPATHLEN - 1] = '\0';
 341         if (strlen(cuename) >= 4) {
 342                 // If 'isofile' is a '.cd<X>' file, use it as a .cue file
 343                 //  and don't try to search the additional .cue file
 344                 if (strncasecmp(cuename + strlen(cuename) - 4, ".cd", 3) != 0 )
 345                         strcpy(cuename + strlen(cuename) - 4, ".cue");
 346         }
 347         else {
 348                 return -1;
 349         }
 350
 351         if ((fi = fopen(cuename, "r")) == NULL) {
 352                 return -1;
 353         }
 354
 355         // Some stupid tutorials wrongly tell users to use cdrdao to rip a
 356         // "bin/cue" image, which is in fact a "bin/toc" image. So let's check
 357         // that...
 358         if (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 359                 if (!strncmp(linebuf, "CD_ROM_XA", 9)) {
 360                         // Don't proceed further, as this is actually a .toc file rather
 361                         // than a .cue file.
 362                         fclose(fi);
 363                         return parsetoc(isofile);
 364                 }
 365                 fseek(fi, 0, SEEK_SET);
 366         }
 367
 368         // build a path for files referenced in .cue
 369         strncpy(filepath, cuename, sizeof(filepath));
 370         tmp = strrchr(filepath, '/');
 371         if (tmp == NULL)
 372                 tmp = strrchr(filepath, '\\');
 373         if (tmp != NULL)
 374                 tmp++;
 375         else
 376                 tmp = filepath;
 377         *tmp = 0;
 378         filepath[sizeof(filepath) - 1] = 0;
 379         incue_fname = tmp;
 380         incue_max_len = sizeof(filepath) - (tmp - filepath) - 1;
 381
 382         memset(&ti, 0, sizeof(ti));
 383
 384         file_len = 0;
 385         sector_offs = 2 * 75;
 386
 387         while (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 388                 strncpy(dummy, linebuf, sizeof(linebuf));
 389                 token = strtok(dummy, " ");
 390
 391                 if (token == NULL) {
 392                         continue;
 393                 }
 394
 395                 if (!strcmp(token, "TRACK")) {
 396                         numtracks++;
 397
 398                         sector_size = 0;
 399                         if (strstr(linebuf, "AUDIO") != NULL) {
 400                                 ti[numtracks].type = CDDA;
 401                                 sector_size = 2352;
 402                         }
 403                         else if (sscanf(linebuf, " TRACK %u MODE%u/%u", &t, &mode, &sector_size) == 3)
 404                                 ti[numtracks].type = DATA;
 405                         else {
 406                                 SysPrintf(".cue: failed to parse TRACK\n");
 407                                 ti[numtracks].type = numtracks == 1 ? DATA : CDDA;
 408                         }
 409                         if (sector_size == 0)
 410                                 sector_size = 2352;
 411                 }
 412                 else if (!strcmp(token, "INDEX")) {
 413                         if (sscanf(linebuf, " INDEX %02d %8s", &t, time) != 2)
 414                                 SysPrintf(".cue: failed to parse INDEX\n");
 415                         tok2msf(time, (char *)&ti[numtracks].start);
 416
 417                         t = msf2sec(ti[numtracks].start);
 418                         ti[numtracks].start_offset = t * sector_size;
 419                         t += sector_offs;
 420                         sec2msf(t, ti[numtracks].start);
 421
 422                         // default track length to file length
 423                         t = file_len - ti[numtracks].start_offset / sector_size;
 424                         sec2msf(t, ti[numtracks].length);
 425
 426                         if (numtracks > 1 && ti[numtracks].handle == NULL) {
 427                                 // this track uses the same file as the last,
 428                                 // start of this track is last track's end
 429                                 t = msf2sec(ti[numtracks].start) - msf2sec(ti[numtracks - 1].start);
 430                                 sec2msf(t, ti[numtracks - 1].length);
 431                         }
 432                         if (numtracks > 1 && pregapOffset == -1)
 433                                 pregapOffset = ti[numtracks].start_offset / sector_size;
 434                 }
 435                 else if (!strcmp(token, "PREGAP")) {
 436                         if (sscanf(linebuf, " PREGAP %8s", time) == 1) {
 437                                 tok2msf(time, dummy);
 438                                 sector_offs += msf2sec(dummy);
 439                         }
 440                         pregapOffset = -1; // mark to fill track start_offset
 441                 }
 442                 else if (!strcmp(token, "FILE")) {
 443                         t = sscanf(linebuf, " FILE \"%255[^\"]\"", tmpb);
 444                         if (t != 1)
 445                                 sscanf(linebuf, " FILE %255s", tmpb);
 446
 447                         tmp = strrchr(tmpb, '\\');
 448                         if (tmp == NULL)
 449                                 tmp = strrchr(tmpb, '/');
 450                         if (tmp != NULL)
 451                                 tmp++;
 452                         else
 453                                 tmp = tmpb;
 454                         strncpy(incue_fname, tmp, incue_max_len);
 455                         ti[numtracks + 1].handle = fopen(filepath, "rb");
 456
 457                         // update global offset if this is not first file in this .cue
 458                         if (numtracks + 1 > 1) {
 459                                 multifile = 1;
 460                                 sector_offs += file_len;
 461                         }
 462
 463                         file_len = 0;
 464                         if (ti[numtracks + 1].handle == NULL) {
 465                                 SysPrintf(_("\ncould not open: %s\n"), filepath);
 466                                 continue;
 467                         }
 468                         fseek(ti[numtracks + 1].handle, 0, SEEK_END);
 469                         file_len = ftell(ti[numtracks + 1].handle) / 2352;
 470
 471                         if (numtracks == 0 && strlen(isofile) >= 4 &&
 472                                 (strcmp(isofile + strlen(isofile) - 4, ".cue") == 0 ||
 473                                 strncasecmp(isofile + strlen(isofile) - 4, ".cd", 3) == 0)) {
 474                                 // user selected .cue/.cdX as image file, use it's data track instead
 475                                 fclose(cdHandle);
 476                                 cdHandle = fopen(filepath, "rb");
 477                         }
 478                 }
 479         }
 480
 481         fclose(fi);
 482
 483         // if there are no tracks detected, then it's not a cue file
 484         if (!numtracks)
 485                 return -1;
 486
 487         return 0;
 488 }
 489
 490 // this function tries to get the .ccd file of the given .img
 491 // the necessary data is put into the ti (trackinformation)-array
 492 static int parseccd(const char *isofile) {
 493         char                    ccdname[MAXPATHLEN];
 494         FILE                    *fi;
 495         char                    linebuf[256];
 496         unsigned int    t;
 497
 498         numtracks = 0;
 499
 500         // copy name of the iso and change extension from .img to .ccd
 501         strncpy(ccdname, isofile, sizeof(ccdname));
 502         ccdname[MAXPATHLEN - 1] = '\0';
 503         if (strlen(ccdname) >= 4) {
 504                 strcpy(ccdname + strlen(ccdname) - 4, ".ccd");
 505         }
 506         else {
 507                 return -1;
 508         }
 509
 510         if ((fi = fopen(ccdname, "r")) == NULL) {
 511                 return -1;
 512         }
 513
 514         memset(&ti, 0, sizeof(ti));
 515
 516         while (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 517                 if (!strncmp(linebuf, "[TRACK", 6)){
 518                         numtracks++;
 519                 }
 520                 else if (!strncmp(linebuf, "MODE=", 5)) {
 521                         sscanf(linebuf, "MODE=%d", &t);
 522                         ti[numtracks].type = ((t == 0) ? CDDA : DATA);
 523                 }
 524                 else if (!strncmp(linebuf, "INDEX 1=", 8)) {
 525                         sscanf(linebuf, "INDEX 1=%d", &t);
 526                         sec2msf(t + 2 * 75, ti[numtracks].start);
 527                         ti[numtracks].start_offset = t * 2352;
 528
 529                         // If we've already seen another track, this is its end
 530                         if (numtracks > 1) {
 531                                 t = msf2sec(ti[numtracks].start) - msf2sec(ti[numtracks - 1].start);
 532                                 sec2msf(t, ti[numtracks - 1].length);
 533                         }
 534                 }
 535         }
 536
 537         fclose(fi);
 538
 539         // Fill out the last track's end based on size
 540         if (numtracks >= 1) {
 541                 fseek(cdHandle, 0, SEEK_END);
 542                 t = ftell(cdHandle) / 2352 - msf2sec(ti[numtracks].start) + 2 * 75;
 543                 sec2msf(t, ti[numtracks].length);
 544         }
 545
 546         return 0;
 547 }
 548
 549 // this function tries to get the .mds file of the given .mdf
 550 // the necessary data is put into the ti (trackinformation)-array
 551 static int parsemds(const char *isofile) {
 552         char                    mdsname[MAXPATHLEN];
 553         FILE                    *fi;
 554         unsigned int    offset, extra_offset, l, i;
 555         unsigned short  s;
 556
 557         numtracks = 0;
 558
 559         // copy name of the iso and change extension from .mdf to .mds
 560         strncpy(mdsname, isofile, sizeof(mdsname));
 561         mdsname[MAXPATHLEN - 1] = '\0';
 562         if (strlen(mdsname) >= 4) {
 563                 strcpy(mdsname + strlen(mdsname) - 4, ".mds");
 564         }
 565         else {
 566                 return -1;
 567         }
 568
 569         if ((fi = fopen(mdsname, "rb")) == NULL) {
 570                 return -1;
 571         }
 572
 573         memset(&ti, 0, sizeof(ti));
 574
 575         // check if it's a valid mds file
 576         if (fread(&i, 1, sizeof(i), fi) != sizeof(i))
 577                 goto fail_io;
 578         i = SWAP32(i);
 579         if (i != 0x4944454D) {
 580                 // not an valid mds file
 581                 fclose(fi);
 582                 return -1;
 583         }
 584
 585         // get offset to session block
 586         fseek(fi, 0x50, SEEK_SET);
 587         if (fread(&offset, 1, sizeof(offset), fi) != sizeof(offset))
 588                 goto fail_io;
 589         offset = SWAP32(offset);
 590
 591         // get total number of tracks
 592         offset += 14;
 593         fseek(fi, offset, SEEK_SET);
 594         if (fread(&s, 1, sizeof(s), fi) != sizeof(s))
 595                 goto fail_io;
 596         s = SWAP16(s);
 597         numtracks = s;
 598
 599         // get offset to track blocks
 600         fseek(fi, 4, SEEK_CUR);
 601         if (fread(&offset, 1, sizeof(offset), fi) != sizeof(offset))
 602                 goto fail_io;
 603         offset = SWAP32(offset);
 604
 605         // skip lead-in data
 606         while (1) {
 607                 fseek(fi, offset + 4, SEEK_SET);
 608                 if (fgetc(fi) < 0xA0) {
 609                         break;
 610                 }
 611                 offset += 0x50;
 612         }
 613
 614         // check if the image contains mixed subchannel data
 615         fseek(fi, offset + 1, SEEK_SET);
 616         subChanMixed = subChanRaw = (fgetc(fi) ? TRUE : FALSE);
 617
 618         // read track data
 619         for (i = 1; i <= numtracks; i++) {
 620                 fseek(fi, offset, SEEK_SET);
 621
 622                 // get the track type
 623                 ti[i].type = ((fgetc(fi) == 0xA9) ? CDDA : DATA);
 624                 fseek(fi, 8, SEEK_CUR);
 625
 626                 // get the track starting point
 627                 ti[i].start[0] = fgetc(fi);
 628                 ti[i].start[1] = fgetc(fi);
 629                 ti[i].start[2] = fgetc(fi);
 630
 631                 if (fread(&extra_offset, 1, sizeof(extra_offset), fi) != sizeof(extra_offset))
 632                         goto fail_io;
 633                 extra_offset = SWAP32(extra_offset);
 634
 635                 // get track start offset (in .mdf)
 636                 fseek(fi, offset + 0x28, SEEK_SET);
 637                 if (fread(&l, 1, sizeof(l), fi) != sizeof(l))
 638                         goto fail_io;
 639                 l = SWAP32(l);
 640                 ti[i].start_offset = l;
 641
 642                 // get pregap
 643                 fseek(fi, extra_offset, SEEK_SET);
 644                 if (fread(&l, 1, sizeof(l), fi) != sizeof(l))
 645                         goto fail_io;
 646                 l = SWAP32(l);
 647                 if (l != 0 && i > 1)
 648                         pregapOffset = msf2sec(ti[i].start);
 649
 650                 // get the track length
 651                 if (fread(&l, 1, sizeof(l), fi) != sizeof(l))
 652                         goto fail_io;
 653                 l = SWAP32(l);
 654                 sec2msf(l, ti[i].length);
 655
 656                 offset += 0x50;
 657         }
 658         fclose(fi);
 659         return 0;
 660 fail_io:
 661 #ifndef NDEBUG
 662         SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
 663 #endif
 664         fclose(fi);
 665         return -1;
 666 }
 667
 668 static int handlepbp(const char *isofile) {
 669         struct {
 670                 unsigned int sig;
 671                 unsigned int dontcare[8];
 672                 unsigned int psar_offs;
 673         } pbp_hdr;
 674         struct {
 675                 unsigned char type;
 676                 unsigned char pad0;
 677                 unsigned char track;
 678                 char index0[3];
 679                 char pad1;
 680                 char index1[3];
 681         } toc_entry;
 682         struct {
 683                 unsigned int offset;
 684                 unsigned int size;
 685                 unsigned int dontcare[6];
 686         } index_entry;
 687         char psar_sig[11];
 688         off_t psisoimg_offs, cdimg_base;
 689         unsigned int t, cd_length;
 690         unsigned int offsettab[8];
 691         unsigned int psar_offs, index_entry_size, index_entry_offset;
 692         const char *ext = NULL;
 693         int i, ret;
 694
 695         if (strlen(isofile) >= 4)
 696                 ext = isofile + strlen(isofile) - 4;
 697         if (ext == NULL || (strcmp(ext, ".pbp") != 0 && strcmp(ext, ".PBP") != 0))
 698                 return -1;
 699
 700         fseeko(cdHandle, 0, SEEK_SET);
 701
 702         numtracks = 0;
 703
 704         ret = fread(&pbp_hdr, 1, sizeof(pbp_hdr), cdHandle);
 705         if (ret != sizeof(pbp_hdr)) {
 706                 SysPrintf("failed to read pbp\n");
 707                 goto fail_io;
 708         }
 709
 710         psar_offs = SWAP32(pbp_hdr.psar_offs);
 711
 712         ret = fseeko(cdHandle, psar_offs, SEEK_SET);
 713         if (ret != 0) {
 714                 SysPrintf("failed to seek to %x\n", psar_offs);
 715                 goto fail_io;
 716         }
 717
 718         psisoimg_offs = psar_offs;
 719         if (fread(psar_sig, 1, sizeof(psar_sig), cdHandle) != sizeof(psar_sig))
 720                 goto fail_io;
 721         psar_sig[10] = 0;
 722         if (strcmp(psar_sig, "PSTITLEIMG") == 0) {
 723                 // multidisk image?
 724                 ret = fseeko(cdHandle, psar_offs + 0x200, SEEK_SET);
 725                 if (ret != 0) {
 726                         SysPrintf("failed to seek to %x\n", psar_offs + 0x200);
 727                         goto fail_io;
 728                 }
 729
 730                 if (fread(&offsettab, 1, sizeof(offsettab), cdHandle) != sizeof(offsettab)) {
 731                         SysPrintf("failed to read offsettab\n");
 732                         goto fail_io;
 733                 }
 734
 735                 for (i = 0; i < sizeof(offsettab) / sizeof(offsettab[0]); i++) {
 736                         if (offsettab[i] == 0)
 737                                 break;
 738                 }
 739                 cdrIsoMultidiskCount = i;
 740                 if (cdrIsoMultidiskCount == 0) {
 741                         SysPrintf("multidisk eboot has 0 images?\n");
 742                         goto fail_io;
 743                 }
 744
 745                 if (cdrIsoMultidiskSelect >= cdrIsoMultidiskCount)
 746                         cdrIsoMultidiskSelect = 0;
 747
 748                 psisoimg_offs += SWAP32(offsettab[cdrIsoMultidiskSelect]);
 749
 750                 ret = fseeko(cdHandle, psisoimg_offs, SEEK_SET);
 751                 if (ret != 0) {
 752                         SysPrintf("failed to seek to %llx\n", (long long)psisoimg_offs);
 753                         goto fail_io;
 754                 }
 755
 756                 if (fread(psar_sig, 1, sizeof(psar_sig), cdHandle) != sizeof(psar_sig))
 757                         goto fail_io;
 758                 psar_sig[10] = 0;
 759         }
 760
 761         if (strcmp(psar_sig, "PSISOIMG00") != 0) {
 762                 SysPrintf("bad psar_sig: %s\n", psar_sig);
 763                 goto fail_io;
 764         }
 765
 766         // seek to TOC
 767         ret = fseeko(cdHandle, psisoimg_offs + 0x800, SEEK_SET);
 768         if (ret != 0) {
 769                 SysPrintf("failed to seek to %llx\n", (long long)psisoimg_offs + 0x800);
 770                 goto fail_io;
 771         }
 772
 773         // first 3 entries are special
 774         fseek(cdHandle, sizeof(toc_entry), SEEK_CUR);
 775         if (fread(&toc_entry, 1, sizeof(toc_entry), cdHandle) != sizeof(toc_entry))
 776                 goto fail_io;
 777         numtracks = btoi(toc_entry.index1[0]);
 778
 779         if (fread(&toc_entry, 1, sizeof(toc_entry), cdHandle) != sizeof(toc_entry))
 780                 goto fail_io;
 781         cd_length = btoi(toc_entry.index1[0]) * 60 * 75 +
 782                 btoi(toc_entry.index1[1]) * 75 + btoi(toc_entry.index1[2]);
 783
 784         for (i = 1; i <= numtracks; i++) {
 785                 if (fread(&toc_entry, 1, sizeof(toc_entry), cdHandle) != sizeof(toc_entry))
 786                         goto fail_io;
 787
 788                 ti[i].type = (toc_entry.type == 1) ? CDDA : DATA;
 789
 790                 ti[i].start_offset = btoi(toc_entry.index0[0]) * 60 * 75 +
 791                         btoi(toc_entry.index0[1]) * 75 + btoi(toc_entry.index0[2]);
 792                 ti[i].start_offset *= 2352;
 793                 ti[i].start[0] = btoi(toc_entry.index1[0]);
 794                 ti[i].start[1] = btoi(toc_entry.index1[1]);
 795                 ti[i].start[2] = btoi(toc_entry.index1[2]);
 796
 797                 if (i > 1) {
 798                         t = msf2sec(ti[i].start) - msf2sec(ti[i - 1].start);
 799                         sec2msf(t, ti[i - 1].length);
 800                 }
 801         }
 802         t = cd_length - ti[numtracks].start_offset / 2352;
 803         sec2msf(t, ti[numtracks].length);
 804
 805         // seek to ISO index
 806         ret = fseeko(cdHandle, psisoimg_offs + 0x4000, SEEK_SET);
 807         if (ret != 0) {
 808                 SysPrintf("failed to seek to ISO index\n");
 809                 goto fail_io;
 810         }
 811
 812         compr_img = calloc(1, sizeof(*compr_img));
 813         if (compr_img == NULL)
 814                 goto fail_io;
 815
 816         compr_img->block_shift = 4;
 817         compr_img->current_block = (unsigned int)-1;
 818
 819         compr_img->index_len = (0x100000 - 0x4000) / sizeof(index_entry);
 820         compr_img->index_table = malloc((compr_img->index_len + 1) * sizeof(compr_img->index_table[0]));
 821         if (compr_img->index_table == NULL)
 822                 goto fail_io;
 823
 824         cdimg_base = psisoimg_offs + 0x100000;
 825         for (i = 0; i < compr_img->index_len; i++) {
 826                 ret = fread(&index_entry, 1, sizeof(index_entry), cdHandle);
 827                 if (ret != sizeof(index_entry)) {
 828                         SysPrintf("failed to read index_entry #%d\n", i);
 829                         goto fail_index;
 830                 }
 831
 832                 index_entry_size = SWAP32(index_entry.size);
 833                 index_entry_offset = SWAP32(index_entry.offset);
 834
 835                 if (index_entry_size == 0)
 836                         break;
 837
 838                 compr_img->index_table[i] = cdimg_base + index_entry_offset;
 839         }
 840         compr_img->index_table[i] = cdimg_base + index_entry_offset + index_entry_size;
 841
 842         return 0;
 843
 844 fail_index:
 845         free(compr_img->index_table);
 846         compr_img->index_table = NULL;
 847         goto done;
 848
 849 fail_io:
 850 #ifndef NDEBUG
 851         SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
 852 #endif
 853
 854 done:
 855         if (compr_img != NULL) {
 856                 free(compr_img);
 857                 compr_img = NULL;
 858         }
 859         return -1;
 860 }
 861
 862 static int handlecbin(const char *isofile) {
 863         struct
 864         {
 865                 char magic[4];
 866                 unsigned int header_size;
 867                 unsigned long long total_bytes;
 868                 unsigned int block_size;
 869                 unsigned char ver;              // 1
 870                 unsigned char align;
 871                 unsigned char rsv_06[2];
 872         } ciso_hdr;
 873         const char *ext = NULL;
 874         unsigned int *index_table = NULL;
 875         unsigned int index = 0, plain;
 876         int i, ret;
 877
 878         if (strlen(isofile) >= 5)
 879                 ext = isofile + strlen(isofile) - 5;
 880         if (ext == NULL || (strcasecmp(ext + 1, ".cbn") != 0 && strcasecmp(ext, ".cbin") != 0))
 881                 return -1;
 882
 883         fseek(cdHandle, 0, SEEK_SET);
 884
 885         ret = fread(&ciso_hdr, 1, sizeof(ciso_hdr), cdHandle);
 886         if (ret != sizeof(ciso_hdr)) {
 887                 SysPrintf("failed to read ciso header\n");
 888                 return -1;
 889         }
 890
 891         if (strncmp(ciso_hdr.magic, "CISO", 4) != 0 || ciso_hdr.total_bytes <= 0 || ciso_hdr.block_size <= 0) {
 892                 SysPrintf("bad ciso header\n");
 893                 return -1;
 894         }
 895         if (ciso_hdr.header_size != 0 && ciso_hdr.header_size != sizeof(ciso_hdr)) {
 896                 ret = fseeko(cdHandle, ciso_hdr.header_size, SEEK_SET);
 897                 if (ret != 0) {
 898                         SysPrintf("failed to seek to %x\n", ciso_hdr.header_size);
 899                         return -1;
 900                 }
 901         }
 902
 903         compr_img = calloc(1, sizeof(*compr_img));
 904         if (compr_img == NULL)
 905                 goto fail_io;
 906
 907         compr_img->block_shift = 0;
 908         compr_img->current_block = (unsigned int)-1;
 909
 910         compr_img->index_len = ciso_hdr.total_bytes / ciso_hdr.block_size;
 911         index_table = malloc((compr_img->index_len + 1) * sizeof(index_table[0]));
 912         if (index_table == NULL)
 913                 goto fail_io;
 914
 915         ret = fread(index_table, sizeof(index_table[0]), compr_img->index_len, cdHandle);
 916         if (ret != compr_img->index_len) {
 917                 SysPrintf("failed to read index table\n");
 918                 goto fail_index;
 919         }
 920
 921         compr_img->index_table = malloc((compr_img->index_len + 1) * sizeof(compr_img->index_table[0]));
 922         if (compr_img->index_table == NULL)
 923                 goto fail_index;
 924
 925         for (i = 0; i < compr_img->index_len + 1; i++) {
 926                 index = index_table[i];
 927                 plain = index & 0x80000000;
 928                 index &= 0x7fffffff;
 929                 compr_img->index_table[i] = (off_t)index << ciso_hdr.align;
 930                 if (plain)
 931                         compr_img->index_table[i] |= OFF_T_MSB;
 932         }
 933
 934         return 0;
 935
 936 fail_index:
 937         free(index_table);
 938 fail_io:
 939         if (compr_img != NULL) {
 940                 free(compr_img);
 941                 compr_img = NULL;
 942         }
 943         return -1;
 944 }
 945
 946 #ifdef HAVE_CHD
 947 static int handlechd(const char *isofile) {
 948         int frame_offset = 150;
 949         int file_offset = 0;
 950
 951         chd_img = calloc(1, sizeof(*chd_img));
 952         if (chd_img == NULL)
 953                 goto fail_io;
 954
 955         if(chd_open(isofile, CHD_OPEN_READ, NULL, &chd_img->chd) != CHDERR_NONE)
 956                 goto fail_io;
 957
 958         if (Config.CHD_Precache && (chd_precache(chd_img->chd) != CHDERR_NONE))
 959                 goto fail_io;
 960
 961         chd_img->header = chd_get_header(chd_img->chd);
 962
 963         chd_img->buffer = malloc(chd_img->header->hunkbytes * 2);
 964         if (chd_img->buffer == NULL)
 965                 goto fail_io;
 966
 967         chd_img->sectors_per_hunk = chd_img->header->hunkbytes / (CD_FRAMESIZE_RAW + SUB_FRAMESIZE);
 968         chd_img->current_hunk[0] = (unsigned int)-1;
 969         chd_img->current_hunk[1] = (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 #if !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 unsigned char *chd_get_sector(unsigned int current_buffer, unsigned int sector_in_hunk)
1422 {
1423         return chd_img->buffer
1424                 + current_buffer * chd_img->header->hunkbytes
1425                 + sector_in_hunk * (CD_FRAMESIZE_RAW + SUB_FRAMESIZE);
1426 }
1427
1428 static int cdread_chd(FILE *f, unsigned int base, void *dest, int sector)
1429 {
1430         int hunk;
1431
1432         sector += base;
1433
1434         hunk = sector / chd_img->sectors_per_hunk;
1435         chd_img->sector_in_hunk = sector % chd_img->sectors_per_hunk;
1436
1437         if (hunk == chd_img->current_hunk[0])
1438                 chd_img->current_buffer = 0;
1439         else if (hunk == chd_img->current_hunk[1])
1440                 chd_img->current_buffer = 1;
1441         else
1442         {
1443                 chd_read(chd_img->chd, hunk, chd_img->buffer +
1444                         chd_img->current_buffer * chd_img->header->hunkbytes);
1445                 chd_img->current_hunk[chd_img->current_buffer] = hunk;
1446         }
1447
1448         if (dest != cdbuffer) // copy avoid HACK
1449                 memcpy(dest, chd_get_sector(chd_img->current_buffer, chd_img->sector_in_hunk),
1450                         CD_FRAMESIZE_RAW);
1451         return CD_FRAMESIZE_RAW;
1452 }
1453
1454 static int cdread_sub_chd(FILE *f, int sector)
1455 {
1456         unsigned int sector_in_hunk;
1457         unsigned int buffer;
1458         int hunk;
1459
1460         if (!subChanMixed)
1461                 return -1;
1462
1463         hunk = sector / chd_img->sectors_per_hunk;
1464         sector_in_hunk = sector % chd_img->sectors_per_hunk;
1465
1466         if (hunk == chd_img->current_hunk[0])
1467                 buffer = 0;
1468         else if (hunk == chd_img->current_hunk[1])
1469                 buffer = 1;
1470         else
1471         {
1472                 buffer = chd_img->current_buffer ^ 1;
1473                 chd_read(chd_img->chd, hunk, chd_img->buffer +
1474                         buffer * chd_img->header->hunkbytes);
1475                 chd_img->current_hunk[buffer] = hunk;
1476         }
1477
1478         memcpy(subbuffer, chd_get_sector(buffer, sector_in_hunk) + CD_FRAMESIZE_RAW, SUB_FRAMESIZE);
1479         return SUB_FRAMESIZE;
1480 }
1481 #endif
1482
1483 static int cdread_2048(FILE *f, unsigned int base, void *dest, int sector)
1484 {
1485         int ret;
1486
1487         fseek(f, base + sector * 2048, SEEK_SET);
1488         ret = fread((char *)dest + 12 * 2, 1, 2048, f);
1489
1490         // not really necessary, fake mode 2 header
1491         memset(cdbuffer, 0, 12 * 2);
1492         sec2msf(sector + 2 * 75, (char *)&cdbuffer[12]);
1493         cdbuffer[12 + 3] = 1;
1494
1495         return 12*2 + ret;
1496 }
1497
1498 #if USE_READ_THREAD
1499
1500 static int cdread_async(FILE *f, unsigned int base, void *dest, int sector) {
1501   boolean found = FALSE;
1502   int i = sector % SECTOR_BUFFER_SIZE;
1503   long ret;
1504
1505   if (f != cdHandle || base != 0 || dest != cdbuffer) {
1506     // Async reads are only supported for cdbuffer, so call the sync
1507     // function directly.
1508     return sync_cdimg_read_func(f, base, dest, sector);
1509   }
1510
1511   pthread_mutex_lock(&read_thread_msg_lock);
1512
1513   // Only wait if we're not trying to read the next sector and
1514   // sector_start is set (meaning the last request hasn't been
1515   // processed yet)
1516   while(read_thread_sector_start != -1 && read_thread_sector_end + 1 != sector) {
1517     pthread_cond_wait(&read_thread_msg_done, &read_thread_msg_lock);
1518   }
1519
1520   if (read_thread_sector_start == -1)
1521     read_thread_sector_start = sector;
1522
1523   read_thread_sector_end = sector;
1524   pthread_cond_signal(&read_thread_msg_avail);
1525   pthread_mutex_unlock(&read_thread_msg_lock);
1526
1527   do {
1528     pthread_mutex_lock(&sectorbuffer_lock);
1529     if (sectorbuffer[i].sector == sector) {
1530       sectorbuffer_index = i;
1531       ret = sectorbuffer[i].ret;
1532       found = TRUE;
1533     }
1534
1535     if (!found) {
1536       pthread_cond_wait(&sectorbuffer_cond, &sectorbuffer_lock);
1537     }
1538     pthread_mutex_unlock(&sectorbuffer_lock);
1539   } while (!found);
1540
1541   return ret;
1542 }
1543
1544 #endif
1545
1546 static unsigned char * CALLBACK ISOgetBuffer_compr(void) {
1547         return compr_img->buff_raw[compr_img->sector_in_blk] + 12;
1548 }
1549
1550 #ifdef HAVE_CHD
1551 static unsigned char * CALLBACK ISOgetBuffer_chd(void) {
1552         return chd_get_sector(chd_img->current_buffer, chd_img->sector_in_hunk) + 12;
1553 }
1554 #endif
1555
1556 #if USE_READ_THREAD
1557 static unsigned char * CALLBACK ISOgetBuffer_async(void) {
1558   unsigned char *buffer;
1559   pthread_mutex_lock(&sectorbuffer_lock);
1560   buffer = sectorbuffer[sectorbuffer_index].data;
1561   pthread_mutex_unlock(&sectorbuffer_lock);
1562   return buffer + 12;
1563 }
1564 #endif
1565
1566 static unsigned char * CALLBACK ISOgetBuffer(void) {
1567         return cdbuffer + 12;
1568 }
1569
1570 static void PrintTracks(void) {
1571         int i;
1572
1573         for (i = 1; i <= numtracks; i++) {
1574                 SysPrintf(_("Track %.2d (%s) - Start %.2d:%.2d:%.2d, Length %.2d:%.2d:%.2d\n"),
1575                         i, (ti[i].type == DATA ? "DATA" : "AUDIO"),
1576                         ti[i].start[0], ti[i].start[1], ti[i].start[2],
1577                         ti[i].length[0], ti[i].length[1], ti[i].length[2]);
1578         }
1579 }
1580
1581 // This function is invoked by the front-end when opening an ISO
1582 // file for playback
1583 static long CALLBACK ISOopen(void) {
1584         boolean isMode1ISO = FALSE;
1585         char alt_bin_filename[MAXPATHLEN];
1586         const char *bin_filename;
1587         char image_str[1024];
1588         int is_chd = 0;
1589
1590         if (cdHandle != NULL) {
1591                 return 0; // it's already open
1592         }
1593
1594         cdHandle = fopen(GetIsoFile(), "rb");
1595         if (cdHandle == NULL) {
1596                 SysPrintf(_("Could't open '%s' for reading: %s\n"),
1597                         GetIsoFile(), strerror(errno));
1598                 return -1;
1599         }
1600
1601         snprintf(image_str, sizeof(image_str) - 6*4 - 1,
1602                 "Loaded CD Image: %s", GetIsoFile());
1603
1604         cddaBigEndian = FALSE;
1605         subChanMixed = FALSE;
1606         subChanRaw = FALSE;
1607         pregapOffset = 0;
1608         cdrIsoMultidiskCount = 1;
1609         multifile = 0;
1610
1611         CDR_getBuffer = ISOgetBuffer;
1612         cdimg_read_func = cdread_normal;
1613         cdimg_read_sub_func = NULL;
1614
1615         if (parsetoc(GetIsoFile()) == 0) {
1616                 strcat(image_str, "[+toc]");
1617         }
1618         else if (parseccd(GetIsoFile()) == 0) {
1619                 strcat(image_str, "[+ccd]");
1620         }
1621         else if (parsemds(GetIsoFile()) == 0) {
1622                 strcat(image_str, "[+mds]");
1623         }
1624         else if (parsecue(GetIsoFile()) == 0) {
1625                 strcat(image_str, "[+cue]");
1626         }
1627         if (handlepbp(GetIsoFile()) == 0) {
1628                 strcat(image_str, "[+pbp]");
1629                 CDR_getBuffer = ISOgetBuffer_compr;
1630                 cdimg_read_func = cdread_compressed;
1631         }
1632         else if (handlecbin(GetIsoFile()) == 0) {
1633                 strcat(image_str, "[+cbin]");
1634                 CDR_getBuffer = ISOgetBuffer_compr;
1635                 cdimg_read_func = cdread_compressed;
1636         }
1637 #ifdef HAVE_CHD
1638         else if (handlechd(GetIsoFile()) == 0) {
1639                 strcat(image_str, "[+chd]");
1640                 CDR_getBuffer = ISOgetBuffer_chd;
1641                 cdimg_read_func = cdread_chd;
1642                 cdimg_read_sub_func = cdread_sub_chd;
1643                 is_chd = 1;
1644         }
1645 #endif
1646
1647         if (!subChanMixed && opensubfile(GetIsoFile()) == 0) {
1648                 strcat(image_str, "[+sub]");
1649         }
1650         if (opensbifile(GetIsoFile()) == 0) {
1651                 strcat(image_str, "[+sbi]");
1652         }
1653
1654         fseeko(cdHandle, 0, SEEK_END);
1655
1656         // maybe user selected metadata file instead of main .bin ..
1657         bin_filename = GetIsoFile();
1658         if (ftello(cdHandle) < 2352 * 0x10) {
1659                 static const char *exts[] = { ".bin", ".BIN", ".img", ".IMG" };
1660                 FILE *tmpf = NULL;
1661                 size_t i;
1662                 char *p;
1663
1664                 strncpy(alt_bin_filename, bin_filename, sizeof(alt_bin_filename));
1665                 alt_bin_filename[MAXPATHLEN - 1] = '\0';
1666                 if (strlen(alt_bin_filename) >= 4) {
1667                         p = alt_bin_filename + strlen(alt_bin_filename) - 4;
1668                         for (i = 0; i < sizeof(exts) / sizeof(exts[0]); i++) {
1669                                 strcpy(p, exts[i]);
1670                                 tmpf = fopen(alt_bin_filename, "rb");
1671                                 if (tmpf != NULL)
1672                                         break;
1673                         }
1674                 }
1675                 if (tmpf != NULL) {
1676                         bin_filename = alt_bin_filename;
1677                         fclose(cdHandle);
1678                         cdHandle = tmpf;
1679                         fseeko(cdHandle, 0, SEEK_END);
1680                 }
1681         }
1682
1683         // guess whether it is mode1/2048
1684         if (ftello(cdHandle) % 2048 == 0) {
1685                 unsigned int modeTest = 0;
1686                 fseek(cdHandle, 0, SEEK_SET);
1687                 if (!fread(&modeTest, sizeof(modeTest), 1, cdHandle)) {
1688 #ifndef NDEBUG
1689                         SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
1690 #endif
1691                         return -1;
1692                 }
1693                 if (SWAP32(modeTest) != 0xffffff00) {
1694                         strcat(image_str, "[2048]");
1695                         isMode1ISO = TRUE;
1696                 }
1697         }
1698         fseek(cdHandle, 0, SEEK_SET);
1699
1700         SysPrintf("%s.\n", image_str);
1701
1702         PrintTracks();
1703
1704         if (subChanMixed && !is_chd) {
1705                 cdimg_read_func = cdread_sub_mixed;
1706                 cdimg_read_sub_func = cdread_sub_sub_mixed;
1707         }
1708         else if (isMode1ISO) {
1709                 cdimg_read_func = cdread_2048;
1710                 cdimg_read_sub_func = NULL;
1711         }
1712
1713         // make sure we have another handle open for cdda
1714         if (numtracks > 1 && ti[1].handle == NULL) {
1715                 ti[1].handle = fopen(bin_filename, "rb");
1716         }
1717
1718   if (Config.AsyncCD) {
1719     readThreadStart();
1720   }
1721         return 0;
1722 }
1723
1724 static long CALLBACK ISOclose(void) {
1725         int i;
1726
1727         if (cdHandle != NULL) {
1728                 fclose(cdHandle);
1729                 cdHandle = NULL;
1730         }
1731         if (subHandle != NULL) {
1732                 fclose(subHandle);
1733                 subHandle = NULL;
1734         }
1735         playing = FALSE;
1736         cddaHandle = NULL;
1737
1738         if (compr_img != NULL) {
1739                 free(compr_img->index_table);
1740                 free(compr_img);
1741                 compr_img = NULL;
1742         }
1743
1744 #ifdef HAVE_CHD
1745         if (chd_img != NULL) {
1746                 chd_close(chd_img->chd);
1747                 free(chd_img->buffer);
1748                 free(chd_img);
1749                 chd_img = NULL;
1750         }
1751 #endif
1752
1753         for (i = 1; i <= numtracks; i++) {
1754                 if (ti[i].handle != NULL) {
1755                         fclose(ti[i].handle);
1756                         ti[i].handle = NULL;
1757                 }
1758         }
1759         numtracks = 0;
1760         ti[1].type = 0;
1761         UnloadSBI();
1762
1763         memset(cdbuffer, 0, sizeof(cdbuffer));
1764         CDR_getBuffer = ISOgetBuffer;
1765
1766         if (Config.AsyncCD) {
1767                 readThreadStop();
1768         }
1769
1770         return 0;
1771 }
1772
1773 static long CALLBACK ISOinit(void) {
1774         assert(cdHandle == NULL);
1775         assert(subHandle == NULL);
1776
1777         return 0; // do nothing
1778 }
1779
1780 static long CALLBACK ISOshutdown(void) {
1781         ISOclose();
1782         return 0;
1783 }
1784
1785 // return Starting and Ending Track
1786 // buffer:
1787 //  byte 0 - start track
1788 //  byte 1 - end track
1789 static long CALLBACK ISOgetTN(unsigned char *buffer) {
1790         buffer[0] = 1;
1791
1792         if (numtracks > 0) {
1793                 buffer[1] = numtracks;
1794         }
1795         else {
1796                 buffer[1] = 1;
1797         }
1798
1799         return 0;
1800 }
1801
1802 // return Track Time
1803 // buffer:
1804 //  byte 0 - frame
1805 //  byte 1 - second
1806 //  byte 2 - minute
1807 static long CALLBACK ISOgetTD(unsigned char track, unsigned char *buffer) {
1808         if (track == 0) {
1809                 unsigned int sect;
1810                 unsigned char time[3];
1811                 sect = msf2sec(ti[numtracks].start) + msf2sec(ti[numtracks].length);
1812                 sec2msf(sect, (char *)time);
1813                 buffer[2] = time[0];
1814                 buffer[1] = time[1];
1815                 buffer[0] = time[2];
1816         }
1817         else if (numtracks > 0 && track <= numtracks) {
1818                 buffer[2] = ti[track].start[0];
1819                 buffer[1] = ti[track].start[1];
1820                 buffer[0] = ti[track].start[2];
1821         }
1822         else {
1823                 buffer[2] = 0;
1824                 buffer[1] = 2;
1825                 buffer[0] = 0;
1826         }
1827
1828         return 0;
1829 }
1830
1831 // decode 'raw' subchannel data ripped by cdrdao
1832 static void DecodeRawSubData(void) {
1833         unsigned char subQData[12];
1834         int i;
1835
1836         memset(subQData, 0, sizeof(subQData));
1837
1838         for (i = 0; i < 8 * 12; i++) {
1839                 if (subbuffer[i] & (1 << 6)) { // only subchannel Q is needed
1840                         subQData[i >> 3] |= (1 << (7 - (i & 7)));
1841                 }
1842         }
1843
1844         memcpy(&subbuffer[12], subQData, 12);
1845 }
1846
1847 // read track
1848 // time: byte 0 - minute; byte 1 - second; byte 2 - frame
1849 // uses bcd format
1850 static boolean CALLBACK ISOreadTrack(unsigned char *time) {
1851         int sector = MSF2SECT(btoi(time[0]), btoi(time[1]), btoi(time[2]));
1852         long ret;
1853
1854         if (cdHandle == NULL) {
1855                 return 0;
1856         }
1857
1858         if (pregapOffset && sector >= pregapOffset)
1859                 sector -= 2 * 75;
1860
1861         ret = cdimg_read_func(cdHandle, 0, cdbuffer, sector);
1862         if (ret < 12*2 + 2048)
1863                 return 0;
1864
1865         return 1;
1866 }
1867
1868 // plays cdda audio
1869 // sector: byte 0 - minute; byte 1 - second; byte 2 - frame
1870 // does NOT uses bcd format
1871 static long CALLBACK ISOplay(unsigned char *time) {
1872         playing = TRUE;
1873         return 0;
1874 }
1875
1876 // stops cdda audio
1877 static long CALLBACK ISOstop(void) {
1878         playing = FALSE;
1879         return 0;
1880 }
1881
1882 // gets subchannel data
1883 static unsigned char* CALLBACK ISOgetBufferSub(int sector) {
1884         if (pregapOffset && sector >= pregapOffset) {
1885                 sector -= 2 * 75;
1886                 if (sector < pregapOffset) // ?
1887                         return NULL;
1888         }
1889
1890         if (cdimg_read_sub_func != NULL) {
1891                 if (cdimg_read_sub_func(cdHandle, sector) != SUB_FRAMESIZE)
1892                         return NULL;
1893         }
1894         else if (subHandle != NULL) {
1895                 if (fseek(subHandle, sector * SUB_FRAMESIZE, SEEK_SET))
1896                         return NULL;
1897                 if (fread(subbuffer, 1, SUB_FRAMESIZE, subHandle) != SUB_FRAMESIZE)
1898                         return NULL;
1899         }
1900         else {
1901                 return NULL;
1902         }
1903
1904         if (subChanRaw) DecodeRawSubData();
1905         return subbuffer;
1906 }
1907
1908 static long CALLBACK ISOgetStatus(struct CdrStat *stat) {
1909         u32 sect;
1910
1911         CDR__getStatus(stat);
1912
1913         if (playing) {
1914                 stat->Type = 0x02;
1915                 stat->Status |= 0x80;
1916         }
1917         else {
1918                 // BIOS - boot ID (CD type)
1919                 stat->Type = ti[1].type;
1920         }
1921
1922         // relative -> absolute time
1923         sect = cddaCurPos;
1924         sec2msf(sect, (char *)stat->Time);
1925
1926         return 0;
1927 }
1928
1929 // read CDDA sector into buffer
1930 long CALLBACK ISOreadCDDA(unsigned char m, unsigned char s, unsigned char f, unsigned char *buffer) {
1931         unsigned char msf[3] = {m, s, f};
1932         unsigned int file, track, track_start = 0;
1933         int ret;
1934
1935         cddaCurPos = msf2sec((char *)msf);
1936
1937         // find current track index
1938         for (track = numtracks; ; track--) {
1939                 track_start = msf2sec(ti[track].start);
1940                 if (track_start <= cddaCurPos)
1941                         break;
1942                 if (track == 1)
1943                         break;
1944         }
1945
1946         // data tracks play silent
1947         if (ti[track].type != CDDA) {
1948                 memset(buffer, 0, CD_FRAMESIZE_RAW);
1949                 return 0;
1950         }
1951
1952         file = 1;
1953         if (multifile) {
1954                 // find the file that contains this track
1955                 for (file = track; file > 1; file--)
1956                         if (ti[file].handle != NULL)
1957                                 break;
1958         }
1959
1960         ret = cdimg_read_func(ti[file].handle, ti[track].start_offset,
1961                 buffer, cddaCurPos - track_start);
1962         if (ret != CD_FRAMESIZE_RAW) {
1963                 memset(buffer, 0, CD_FRAMESIZE_RAW);
1964                 return -1;
1965         }
1966
1967         if (cddaBigEndian) {
1968                 int i;
1969                 unsigned char tmp;
1970
1971                 for (i = 0; i < CD_FRAMESIZE_RAW / 2; i++) {
1972                         tmp = buffer[i * 2];
1973                         buffer[i * 2] = buffer[i * 2 + 1];
1974                         buffer[i * 2 + 1] = tmp;
1975                 }
1976         }
1977
1978         return 0;
1979 }
1980
1981 void cdrIsoInit(void) {
1982         CDR_init = ISOinit;
1983         CDR_shutdown = ISOshutdown;
1984         CDR_open = ISOopen;
1985         CDR_close = ISOclose;
1986         CDR_getTN = ISOgetTN;
1987         CDR_getTD = ISOgetTD;
1988         CDR_readTrack = ISOreadTrack;
1989         CDR_getBuffer = ISOgetBuffer;
1990         CDR_play = ISOplay;
1991         CDR_stop = ISOstop;
1992         CDR_getBufferSub = ISOgetBufferSub;
1993         CDR_getStatus = ISOgetStatus;
1994         CDR_readCDDA = ISOreadCDDA;
1995
1996         CDR_getDriveLetter = CDR__getDriveLetter;
1997         CDR_configure = CDR__configure;
1998         CDR_test = CDR__test;
1999         CDR_about = CDR__about;
2000         CDR_setfilename = CDR__setfilename;
2001
2002         numtracks = 0;
2003 }
2004
2005 int cdrIsoActive(void) {
2006         return (cdHandle != NULL);
2007 }