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 strcasecmp _stricmp
  36 #else
  37 #include <sys/types.h>
  38 #include <sys/stat.h>
  39 #include <unistd.h>
  40 #if P_HAVE_PTHREAD
  41 #include <pthread.h>
  42 #include <sys/time.h>
  43 #endif
  44 #endif
  45
  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 0 //P_HAVE_PTHREAD
  50
  51 #ifdef USE_LIBRETRO_VFS
  52 #include <streams/file_stream_transforms.h>
  53 #undef fseeko
  54 #undef ftello
  55 #undef rewind
  56 #define ftello rftell
  57 #define fseeko rfseek
  58 #define rewind(f_) rfseek(f_, 0, SEEK_SET)
  59 #endif
  60
  61 #define OFF_T_MSB ((off_t)1 << (sizeof(off_t) * 8 - 1))
  62
  63 unsigned int cdrIsoMultidiskCount;
  64 unsigned int cdrIsoMultidiskSelect;
  65
  66 static FILE *cdHandle = NULL;
  67 static FILE *cddaHandle = NULL;
  68 static FILE *subHandle = NULL;
  69
  70 static boolean subChanMixed = FALSE;
  71 static boolean subChanRaw = FALSE;
  72
  73 static boolean multifile = FALSE;
  74
  75 static unsigned char cdbuffer[CD_FRAMESIZE_RAW];
  76 static unsigned char subbuffer[SUB_FRAMESIZE];
  77
  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 // 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 #else
 107 #define chd_img 0
 108 #endif
 109
 110 static int (*cdimg_read_func)(FILE *f, unsigned int base, void *dest, int sector);
 111 static int (*cdimg_read_sub_func)(FILE *f, int sector);
 112
 113 char* CALLBACK CDR__getDriveLetter(void);
 114 long CALLBACK CDR__configure(void);
 115 long CALLBACK CDR__test(void);
 116 void CALLBACK CDR__about(void);
 117 long CALLBACK CDR__setfilename(char *filename);
 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 (chd: sector offset)
 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 static off_t get_size(FILE *f)
 177 {
 178         off_t old, size;
 179 #if !defined(USE_LIBRETRO_VFS)
 180         struct stat st;
 181         if (fstat(fileno(f), &st) == 0)
 182                 return st.st_size;
 183 #endif
 184         old = ftello(f);
 185         fseeko(f, 0, SEEK_END);
 186         size = ftello(f);
 187         fseeko(f, old, SEEK_SET);
 188         return size;
 189 }
 190
 191 // this function tries to get the .toc file of the given .bin
 192 // the necessary data is put into the ti (trackinformation)-array
 193 static int parsetoc(const char *isofile) {
 194         char                    tocname[MAXPATHLEN];
 195         FILE                    *fi;
 196         char                    linebuf[256], tmp[256], name[256];
 197         char                    *token;
 198         char                    time[20], time2[20];
 199         unsigned int    t, sector_offs, sector_size;
 200         unsigned int    current_zero_gap = 0;
 201
 202         numtracks = 0;
 203
 204         // copy name of the iso and change extension from .bin to .toc
 205         strncpy(tocname, isofile, sizeof(tocname));
 206         tocname[MAXPATHLEN - 1] = '\0';
 207         if (strlen(tocname) >= 4) {
 208                 strcpy(tocname + strlen(tocname) - 4, ".toc");
 209         }
 210         else {
 211                 return -1;
 212         }
 213
 214         if ((fi = fopen(tocname, "r")) == NULL) {
 215                 // try changing extension to .cue (to satisfy some stupid tutorials)
 216                 strcpy(tocname + strlen(tocname) - 4, ".cue");
 217                 if ((fi = fopen(tocname, "r")) == NULL) {
 218                         // if filename is image.toc.bin, try removing .bin (for Brasero)
 219                         strcpy(tocname, isofile);
 220                         t = strlen(tocname);
 221                         if (t >= 8 && strcmp(tocname + t - 8, ".toc.bin") == 0) {
 222                                 tocname[t - 4] = '\0';
 223                                 if ((fi = fopen(tocname, "r")) == NULL) {
 224                                         return -1;
 225                                 }
 226                         }
 227                         else {
 228                                 return -1;
 229                         }
 230                 }
 231                 // check if it's really a TOC named as a .cue
 232                 if (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 233                 token = strtok(linebuf, " ");
 234                 if (token && strncmp(token, "CD", 2) != 0) {
 235                        // && strcmp(token, "CATALOG") != 0) - valid for a real .cue
 236                         fclose(fi);
 237                         return -1;
 238                 }
 239                 }
 240                 fseek(fi, 0, SEEK_SET);
 241         }
 242
 243         memset(&ti, 0, sizeof(ti));
 244         cddaBigEndian = TRUE; // cdrdao uses big-endian for CD Audio
 245
 246         sector_size = CD_FRAMESIZE_RAW;
 247         sector_offs = 2 * 75;
 248
 249         // parse the .toc file
 250         while (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 251                 // search for tracks
 252                 strncpy(tmp, linebuf, sizeof(linebuf));
 253                 token = strtok(tmp, " ");
 254
 255                 if (token == NULL) continue;
 256
 257                 if (!strcmp(token, "TRACK")) {
 258                         sector_offs += current_zero_gap;
 259                         current_zero_gap = 0;
 260
 261                         // get type of track
 262                         token = strtok(NULL, " ");
 263                         numtracks++;
 264
 265                         if (!strncmp(token, "MODE2_RAW", 9)) {
 266                                 ti[numtracks].type = DATA;
 267                                 sec2msf(2 * 75, ti[numtracks].start); // assume data track on 0:2:0
 268
 269                                 // check if this image contains mixed subchannel data
 270                                 token = strtok(NULL, " ");
 271                                 if (token != NULL && !strncmp(token, "RW", 2)) {
 272                                         sector_size = CD_FRAMESIZE_RAW + SUB_FRAMESIZE;
 273                                         subChanMixed = TRUE;
 274                                         if (!strncmp(token, "RW_RAW", 6))
 275                                                 subChanRaw = TRUE;
 276                                 }
 277                         }
 278                         else if (!strncmp(token, "AUDIO", 5)) {
 279                                 ti[numtracks].type = CDDA;
 280                         }
 281                 }
 282                 else if (!strcmp(token, "DATAFILE")) {
 283                         if (ti[numtracks].type == CDDA) {
 284                                 sscanf(linebuf, "DATAFILE \"%[^\"]\" #%d %8s", name, &t, time2);
 285                                 ti[numtracks].start_offset = t;
 286                                 t = t / sector_size + sector_offs;
 287                                 sec2msf(t, (char *)&ti[numtracks].start);
 288                                 tok2msf((char *)&time2, (char *)&ti[numtracks].length);
 289                         }
 290                         else {
 291                                 sscanf(linebuf, "DATAFILE \"%[^\"]\" %8s", name, time);
 292                                 tok2msf((char *)&time, (char *)&ti[numtracks].length);
 293                         }
 294                 }
 295                 else if (!strcmp(token, "FILE")) {
 296                         sscanf(linebuf, "FILE \"%[^\"]\" #%d %8s %8s", name, &t, time, time2);
 297                         tok2msf((char *)&time, (char *)&ti[numtracks].start);
 298                         t += msf2sec(ti[numtracks].start) * sector_size;
 299                         ti[numtracks].start_offset = t;
 300                         t = t / sector_size + sector_offs;
 301                         sec2msf(t, (char *)&ti[numtracks].start);
 302                         tok2msf((char *)&time2, (char *)&ti[numtracks].length);
 303                 }
 304                 else if (!strcmp(token, "ZERO") || !strcmp(token, "SILENCE")) {
 305                         // skip unneeded optional fields
 306                         while (token != NULL) {
 307                                 token = strtok(NULL, " ");
 308                                 if (strchr(token, ':') != NULL)
 309                                         break;
 310                         }
 311                         if (token != NULL) {
 312                                 tok2msf(token, tmp);
 313                                 current_zero_gap = msf2sec(tmp);
 314                         }
 315                         if (numtracks > 1) {
 316                                 t = ti[numtracks - 1].start_offset;
 317                                 t /= sector_size;
 318                                 pregapOffset = t + msf2sec(ti[numtracks - 1].length);
 319                         }
 320                 }
 321                 else if (!strcmp(token, "START")) {
 322                         token = strtok(NULL, " ");
 323                         if (token != NULL && strchr(token, ':')) {
 324                                 tok2msf(token, tmp);
 325                                 t = msf2sec(tmp);
 326                                 ti[numtracks].start_offset += (t - current_zero_gap) * sector_size;
 327                                 t = msf2sec(ti[numtracks].start) + t;
 328                                 sec2msf(t, (char *)&ti[numtracks].start);
 329                         }
 330                 }
 331         }
 332
 333         fclose(fi);
 334
 335         return 0;
 336 }
 337
 338 // this function tries to get the .cue file of the given .bin
 339 // the necessary data is put into the ti (trackinformation)-array
 340 static int parsecue(const char *isofile) {
 341         char                    cuename[MAXPATHLEN];
 342         char                    filepath[MAXPATHLEN];
 343         char                    *incue_fname;
 344         FILE                    *fi;
 345         FILE                    *ftmp = NULL;
 346         char                    *token;
 347         char                    time[20];
 348         char                    *tmp;
 349         char                    linebuf[256], tmpb[256], dummy[256];
 350         unsigned int    incue_max_len;
 351         unsigned int    t, file_len, mode, sector_offs;
 352         unsigned int    sector_size = 2352;
 353
 354         numtracks = 0;
 355
 356         // copy name of the iso and change extension from .bin to .cue
 357         strncpy(cuename, isofile, sizeof(cuename));
 358         cuename[MAXPATHLEN - 1] = '\0';
 359         if (strlen(cuename) < 4)
 360                 return -1;
 361         if (strcasecmp(cuename + strlen(cuename) - 4, ".cue") == 0) {
 362                 // it's already open as cdHandle
 363                 fi = cdHandle;
 364         }
 365         else {
 366                 // If 'isofile' is a '.cd<X>' file, use it as a .cue file
 367                 //  and don't try to search the additional .cue file
 368                 if (strncasecmp(cuename + strlen(cuename) - 4, ".cd", 3) != 0 )
 369                         strcpy(cuename + strlen(cuename) - 4, ".cue");
 370
 371                 if ((ftmp = fopen(cuename, "r")) == NULL)
 372                         return -1;
 373                 fi = ftmp;
 374         }
 375
 376         // Some stupid tutorials wrongly tell users to use cdrdao to rip a
 377         // "bin/cue" image, which is in fact a "bin/toc" image. So let's check
 378         // that...
 379         if (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 380                 if (!strncmp(linebuf, "CD_ROM_XA", 9)) {
 381                         // Don't proceed further, as this is actually a .toc file rather
 382                         // than a .cue file.
 383                         if (ftmp)
 384                                 fclose(ftmp);
 385                         return parsetoc(isofile);
 386                 }
 387                 rewind(fi);
 388         }
 389
 390         // build a path for files referenced in .cue
 391         strncpy(filepath, cuename, sizeof(filepath));
 392         tmp = strrchr(filepath, '/');
 393         if (tmp == NULL)
 394                 tmp = strrchr(filepath, '\\');
 395         if (tmp != NULL)
 396                 tmp++;
 397         else
 398                 tmp = filepath;
 399         *tmp = 0;
 400         filepath[sizeof(filepath) - 1] = 0;
 401         incue_fname = tmp;
 402         incue_max_len = sizeof(filepath) - (tmp - filepath) - 1;
 403
 404         memset(&ti, 0, sizeof(ti));
 405
 406         file_len = 0;
 407         sector_offs = 2 * 75;
 408
 409         while (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 410                 strncpy(dummy, linebuf, sizeof(linebuf));
 411                 token = strtok(dummy, " ");
 412
 413                 if (token == NULL) {
 414                         continue;
 415                 }
 416
 417                 if (!strcmp(token, "TRACK")) {
 418                         numtracks++;
 419
 420                         sector_size = 0;
 421                         if (strstr(linebuf, "AUDIO") != NULL) {
 422                                 ti[numtracks].type = CDDA;
 423                                 sector_size = 2352;
 424                         }
 425                         else if (sscanf(linebuf, " TRACK %u MODE%u/%u", &t, &mode, &sector_size) == 3)
 426                                 ti[numtracks].type = DATA;
 427                         else {
 428                                 SysPrintf(".cue: failed to parse TRACK\n");
 429                                 ti[numtracks].type = numtracks == 1 ? DATA : CDDA;
 430                         }
 431                         if (sector_size == 0)
 432                                 sector_size = 2352;
 433                 }
 434                 else if (!strcmp(token, "INDEX")) {
 435                         if (sscanf(linebuf, " INDEX %02d %8s", &t, time) != 2)
 436                                 SysPrintf(".cue: failed to parse INDEX\n");
 437                         tok2msf(time, (char *)&ti[numtracks].start);
 438
 439                         t = msf2sec(ti[numtracks].start);
 440                         ti[numtracks].start_offset = t * sector_size;
 441                         t += sector_offs;
 442                         sec2msf(t, ti[numtracks].start);
 443
 444                         // default track length to file length
 445                         t = file_len - ti[numtracks].start_offset / sector_size;
 446                         sec2msf(t, ti[numtracks].length);
 447
 448                         if (numtracks > 1 && ti[numtracks].handle == NULL) {
 449                                 // this track uses the same file as the last,
 450                                 // start of this track is last track's end
 451                                 t = msf2sec(ti[numtracks].start) - msf2sec(ti[numtracks - 1].start);
 452                                 sec2msf(t, ti[numtracks - 1].length);
 453                         }
 454                         if (numtracks > 1 && pregapOffset == -1)
 455                                 pregapOffset = ti[numtracks].start_offset / sector_size;
 456                 }
 457                 else if (!strcmp(token, "PREGAP")) {
 458                         if (sscanf(linebuf, " PREGAP %8s", time) == 1) {
 459                                 tok2msf(time, dummy);
 460                                 sector_offs += msf2sec(dummy);
 461                         }
 462                         pregapOffset = -1; // mark to fill track start_offset
 463                 }
 464                 else if (!strcmp(token, "FILE")) {
 465                         t = sscanf(linebuf, " FILE \"%255[^\"]\"", tmpb);
 466                         if (t != 1)
 467                                 sscanf(linebuf, " FILE %255s", tmpb);
 468
 469                         tmp = strrchr(tmpb, '\\');
 470                         if (tmp == NULL)
 471                                 tmp = strrchr(tmpb, '/');
 472                         if (tmp != NULL)
 473                                 tmp++;
 474                         else
 475                                 tmp = tmpb;
 476                         strncpy(incue_fname, tmp, incue_max_len);
 477                         ti[numtracks + 1].handle = fopen(filepath, "rb");
 478
 479                         // update global offset if this is not first file in this .cue
 480                         if (numtracks + 1 > 1) {
 481                                 multifile = 1;
 482                                 sector_offs += file_len;
 483                         }
 484
 485                         file_len = 0;
 486                         if (ti[numtracks + 1].handle == NULL) {
 487                                 SysPrintf(_("\ncould not open: %s\n"), filepath);
 488                                 continue;
 489                         }
 490                         file_len = get_size(ti[numtracks + 1].handle) / 2352;
 491                 }
 492         }
 493
 494         if (ftmp)
 495                 fclose(ftmp);
 496
 497         // if there are no tracks detected, then it's not a cue file
 498         if (!numtracks)
 499                 return -1;
 500
 501         // the data track handle is always in cdHandle
 502         if (ti[1].handle) {
 503                 fclose(cdHandle);
 504                 cdHandle = ti[1].handle;
 505                 ti[1].handle = NULL;
 506         }
 507         return 0;
 508 }
 509
 510 // this function tries to get the .ccd file of the given .img
 511 // the necessary data is put into the ti (trackinformation)-array
 512 static int parseccd(const char *isofile) {
 513         char                    ccdname[MAXPATHLEN];
 514         FILE                    *fi;
 515         char                    linebuf[256];
 516         unsigned int    t;
 517
 518         numtracks = 0;
 519
 520         // copy name of the iso and change extension from .img to .ccd
 521         strncpy(ccdname, isofile, sizeof(ccdname));
 522         ccdname[MAXPATHLEN - 1] = '\0';
 523         if (strlen(ccdname) >= 4) {
 524                 strcpy(ccdname + strlen(ccdname) - 4, ".ccd");
 525         }
 526         else {
 527                 return -1;
 528         }
 529
 530         if ((fi = fopen(ccdname, "r")) == NULL) {
 531                 return -1;
 532         }
 533
 534         memset(&ti, 0, sizeof(ti));
 535
 536         while (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 537                 if (!strncmp(linebuf, "[TRACK", 6)){
 538                         numtracks++;
 539                 }
 540                 else if (!strncmp(linebuf, "MODE=", 5)) {
 541                         sscanf(linebuf, "MODE=%d", &t);
 542                         ti[numtracks].type = ((t == 0) ? CDDA : DATA);
 543                 }
 544                 else if (!strncmp(linebuf, "INDEX 1=", 8)) {
 545                         sscanf(linebuf, "INDEX 1=%d", &t);
 546                         sec2msf(t + 2 * 75, ti[numtracks].start);
 547                         ti[numtracks].start_offset = t * 2352;
 548
 549                         // If we've already seen another track, this is its end
 550                         if (numtracks > 1) {
 551                                 t = msf2sec(ti[numtracks].start) - msf2sec(ti[numtracks - 1].start);
 552                                 sec2msf(t, ti[numtracks - 1].length);
 553                         }
 554                 }
 555         }
 556
 557         fclose(fi);
 558
 559         // Fill out the last track's end based on size
 560         if (numtracks >= 1) {
 561                 t = get_size(cdHandle) / 2352 - msf2sec(ti[numtracks].start) + 2 * 75;
 562                 sec2msf(t, ti[numtracks].length);
 563         }
 564
 565         return 0;
 566 }
 567
 568 // this function tries to get the .mds file of the given .mdf
 569 // the necessary data is put into the ti (trackinformation)-array
 570 static int parsemds(const char *isofile) {
 571         char                    mdsname[MAXPATHLEN];
 572         FILE                    *fi;
 573         unsigned int    offset, extra_offset, l, i;
 574         unsigned short  s;
 575
 576         numtracks = 0;
 577
 578         // copy name of the iso and change extension from .mdf to .mds
 579         strncpy(mdsname, isofile, sizeof(mdsname));
 580         mdsname[MAXPATHLEN - 1] = '\0';
 581         if (strlen(mdsname) >= 4) {
 582                 strcpy(mdsname + strlen(mdsname) - 4, ".mds");
 583         }
 584         else {
 585                 return -1;
 586         }
 587
 588         if ((fi = fopen(mdsname, "rb")) == NULL) {
 589                 return -1;
 590         }
 591
 592         memset(&ti, 0, sizeof(ti));
 593
 594         // check if it's a valid mds file
 595         if (fread(&i, 1, sizeof(i), fi) != sizeof(i))
 596                 goto fail_io;
 597         i = SWAP32(i);
 598         if (i != 0x4944454D) {
 599                 // not an valid mds file
 600                 fclose(fi);
 601                 return -1;
 602         }
 603
 604         // get offset to session block
 605         fseek(fi, 0x50, SEEK_SET);
 606         if (fread(&offset, 1, sizeof(offset), fi) != sizeof(offset))
 607                 goto fail_io;
 608         offset = SWAP32(offset);
 609
 610         // get total number of tracks
 611         offset += 14;
 612         fseek(fi, offset, SEEK_SET);
 613         if (fread(&s, 1, sizeof(s), fi) != sizeof(s))
 614                 goto fail_io;
 615         s = SWAP16(s);
 616         numtracks = s;
 617
 618         // get offset to track blocks
 619         fseek(fi, 4, SEEK_CUR);
 620         if (fread(&offset, 1, sizeof(offset), fi) != sizeof(offset))
 621                 goto fail_io;
 622         offset = SWAP32(offset);
 623
 624         // skip lead-in data
 625         while (1) {
 626                 fseek(fi, offset + 4, SEEK_SET);
 627                 if (fgetc(fi) < 0xA0) {
 628                         break;
 629                 }
 630                 offset += 0x50;
 631         }
 632
 633         // check if the image contains mixed subchannel data
 634         fseek(fi, offset + 1, SEEK_SET);
 635         subChanMixed = subChanRaw = (fgetc(fi) ? TRUE : FALSE);
 636
 637         // read track data
 638         for (i = 1; i <= numtracks; i++) {
 639                 fseek(fi, offset, SEEK_SET);
 640
 641                 // get the track type
 642                 ti[i].type = ((fgetc(fi) == 0xA9) ? CDDA : DATA);
 643                 fseek(fi, 8, SEEK_CUR);
 644
 645                 // get the track starting point
 646                 ti[i].start[0] = fgetc(fi);
 647                 ti[i].start[1] = fgetc(fi);
 648                 ti[i].start[2] = fgetc(fi);
 649
 650                 if (fread(&extra_offset, 1, sizeof(extra_offset), fi) != sizeof(extra_offset))
 651                         goto fail_io;
 652                 extra_offset = SWAP32(extra_offset);
 653
 654                 // get track start offset (in .mdf)
 655                 fseek(fi, offset + 0x28, SEEK_SET);
 656                 if (fread(&l, 1, sizeof(l), fi) != sizeof(l))
 657                         goto fail_io;
 658                 l = SWAP32(l);
 659                 ti[i].start_offset = l;
 660
 661                 // get pregap
 662                 fseek(fi, extra_offset, SEEK_SET);
 663                 if (fread(&l, 1, sizeof(l), fi) != sizeof(l))
 664                         goto fail_io;
 665                 l = SWAP32(l);
 666                 if (l != 0 && i > 1)
 667                         pregapOffset = msf2sec(ti[i].start);
 668
 669                 // get the track length
 670                 if (fread(&l, 1, sizeof(l), fi) != sizeof(l))
 671                         goto fail_io;
 672                 l = SWAP32(l);
 673                 sec2msf(l, ti[i].length);
 674
 675                 offset += 0x50;
 676         }
 677         fclose(fi);
 678         return 0;
 679 fail_io:
 680 #ifndef NDEBUG
 681         SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
 682 #endif
 683         fclose(fi);
 684         return -1;
 685 }
 686
 687 static int handlepbp(const char *isofile) {
 688         struct {
 689                 unsigned int sig;
 690                 unsigned int dontcare[8];
 691                 unsigned int psar_offs;
 692         } pbp_hdr;
 693         struct {
 694                 unsigned char type;
 695                 unsigned char pad0;
 696                 unsigned char track;
 697                 char index0[3];
 698                 char pad1;
 699                 char index1[3];
 700         } toc_entry;
 701         struct {
 702                 unsigned int offset;
 703                 unsigned int size;
 704                 unsigned int dontcare[6];
 705         } index_entry;
 706         char psar_sig[11];
 707         off_t psisoimg_offs, cdimg_base;
 708         unsigned int t, cd_length;
 709         unsigned int offsettab[8];
 710         unsigned int psar_offs, index_entry_size, index_entry_offset;
 711         const char *ext = NULL;
 712         int i, ret;
 713
 714         if (strlen(isofile) >= 4)
 715                 ext = isofile + strlen(isofile) - 4;
 716         if (ext == NULL || strcasecmp(ext, ".pbp") != 0)
 717                 return -1;
 718
 719         numtracks = 0;
 720
 721         ret = fread(&pbp_hdr, 1, sizeof(pbp_hdr), cdHandle);
 722         if (ret != sizeof(pbp_hdr)) {
 723                 SysPrintf("failed to read pbp\n");
 724                 goto fail_io;
 725         }
 726
 727         psar_offs = SWAP32(pbp_hdr.psar_offs);
 728
 729         ret = fseeko(cdHandle, psar_offs, SEEK_SET);
 730         if (ret != 0) {
 731                 SysPrintf("failed to seek to %x\n", psar_offs);
 732                 goto fail_io;
 733         }
 734
 735         psisoimg_offs = psar_offs;
 736         if (fread(psar_sig, 1, sizeof(psar_sig), cdHandle) != sizeof(psar_sig))
 737                 goto fail_io;
 738         psar_sig[10] = 0;
 739         if (strcmp(psar_sig, "PSTITLEIMG") == 0) {
 740                 // multidisk image?
 741                 ret = fseeko(cdHandle, psar_offs + 0x200, SEEK_SET);
 742                 if (ret != 0) {
 743                         SysPrintf("failed to seek to %x\n", psar_offs + 0x200);
 744                         goto fail_io;
 745                 }
 746
 747                 if (fread(&offsettab, 1, sizeof(offsettab), cdHandle) != sizeof(offsettab)) {
 748                         SysPrintf("failed to read offsettab\n");
 749                         goto fail_io;
 750                 }
 751
 752                 for (i = 0; i < sizeof(offsettab) / sizeof(offsettab[0]); i++) {
 753                         if (offsettab[i] == 0)
 754                                 break;
 755                 }
 756                 cdrIsoMultidiskCount = i;
 757                 if (cdrIsoMultidiskCount == 0) {
 758                         SysPrintf("multidisk eboot has 0 images?\n");
 759                         goto fail_io;
 760                 }
 761
 762                 if (cdrIsoMultidiskSelect >= cdrIsoMultidiskCount)
 763                         cdrIsoMultidiskSelect = 0;
 764
 765                 psisoimg_offs += SWAP32(offsettab[cdrIsoMultidiskSelect]);
 766
 767                 ret = fseeko(cdHandle, psisoimg_offs, SEEK_SET);
 768                 if (ret != 0) {
 769                         SysPrintf("failed to seek to %llx\n", (long long)psisoimg_offs);
 770                         goto fail_io;
 771                 }
 772
 773                 if (fread(psar_sig, 1, sizeof(psar_sig), cdHandle) != sizeof(psar_sig))
 774                         goto fail_io;
 775                 psar_sig[10] = 0;
 776         }
 777
 778         if (strcmp(psar_sig, "PSISOIMG00") != 0) {
 779                 SysPrintf("bad psar_sig: %s\n", psar_sig);
 780                 goto fail_io;
 781         }
 782
 783         // seek to TOC
 784         ret = fseeko(cdHandle, psisoimg_offs + 0x800, SEEK_SET);
 785         if (ret != 0) {
 786                 SysPrintf("failed to seek to %llx\n", (long long)psisoimg_offs + 0x800);
 787                 goto fail_io;
 788         }
 789
 790         // first 3 entries are special
 791         fseek(cdHandle, sizeof(toc_entry), SEEK_CUR);
 792         if (fread(&toc_entry, 1, sizeof(toc_entry), cdHandle) != sizeof(toc_entry))
 793                 goto fail_io;
 794         numtracks = btoi(toc_entry.index1[0]);
 795
 796         if (fread(&toc_entry, 1, sizeof(toc_entry), cdHandle) != sizeof(toc_entry))
 797                 goto fail_io;
 798         cd_length = btoi(toc_entry.index1[0]) * 60 * 75 +
 799                 btoi(toc_entry.index1[1]) * 75 + btoi(toc_entry.index1[2]);
 800
 801         for (i = 1; i <= numtracks; i++) {
 802                 if (fread(&toc_entry, 1, sizeof(toc_entry), cdHandle) != sizeof(toc_entry))
 803                         goto fail_io;
 804
 805                 ti[i].type = (toc_entry.type == 1) ? CDDA : DATA;
 806
 807                 ti[i].start_offset = btoi(toc_entry.index0[0]) * 60 * 75 +
 808                         btoi(toc_entry.index0[1]) * 75 + btoi(toc_entry.index0[2]);
 809                 ti[i].start_offset *= 2352;
 810                 ti[i].start[0] = btoi(toc_entry.index1[0]);
 811                 ti[i].start[1] = btoi(toc_entry.index1[1]);
 812                 ti[i].start[2] = btoi(toc_entry.index1[2]);
 813
 814                 if (i > 1) {
 815                         t = msf2sec(ti[i].start) - msf2sec(ti[i - 1].start);
 816                         sec2msf(t, ti[i - 1].length);
 817                 }
 818         }
 819         t = cd_length - ti[numtracks].start_offset / 2352;
 820         sec2msf(t, ti[numtracks].length);
 821
 822         // seek to ISO index
 823         ret = fseeko(cdHandle, psisoimg_offs + 0x4000, SEEK_SET);
 824         if (ret != 0) {
 825                 SysPrintf("failed to seek to ISO index\n");
 826                 goto fail_io;
 827         }
 828
 829         compr_img = calloc(1, sizeof(*compr_img));
 830         if (compr_img == NULL)
 831                 goto fail_io;
 832
 833         compr_img->block_shift = 4;
 834         compr_img->current_block = (unsigned int)-1;
 835
 836         compr_img->index_len = (0x100000 - 0x4000) / sizeof(index_entry);
 837         compr_img->index_table = malloc((compr_img->index_len + 1) * sizeof(compr_img->index_table[0]));
 838         if (compr_img->index_table == NULL)
 839                 goto fail_io;
 840
 841         cdimg_base = psisoimg_offs + 0x100000;
 842         for (i = 0; i < compr_img->index_len; i++) {
 843                 ret = fread(&index_entry, 1, sizeof(index_entry), cdHandle);
 844                 if (ret != sizeof(index_entry)) {
 845                         SysPrintf("failed to read index_entry #%d\n", i);
 846                         goto fail_index;
 847                 }
 848
 849                 index_entry_size = SWAP32(index_entry.size);
 850                 index_entry_offset = SWAP32(index_entry.offset);
 851
 852                 if (index_entry_size == 0)
 853                         break;
 854
 855                 compr_img->index_table[i] = cdimg_base + index_entry_offset;
 856         }
 857         compr_img->index_table[i] = cdimg_base + index_entry_offset + index_entry_size;
 858
 859         return 0;
 860
 861 fail_index:
 862         free(compr_img->index_table);
 863         compr_img->index_table = NULL;
 864         goto done;
 865
 866 fail_io:
 867         SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
 868         rewind(cdHandle);
 869
 870 done:
 871         if (compr_img != NULL) {
 872                 free(compr_img);
 873                 compr_img = NULL;
 874         }
 875         return -1;
 876 }
 877
 878 static int handlecbin(const char *isofile) {
 879         struct
 880         {
 881                 char magic[4];
 882                 unsigned int header_size;
 883                 unsigned long long total_bytes;
 884                 unsigned int block_size;
 885                 unsigned char ver;              // 1
 886                 unsigned char align;
 887                 unsigned char rsv_06[2];
 888         } ciso_hdr;
 889         const char *ext = NULL;
 890         unsigned int *index_table = NULL;
 891         unsigned int index = 0, plain;
 892         int i, ret;
 893
 894         if (strlen(isofile) >= 5)
 895                 ext = isofile + strlen(isofile) - 5;
 896         if (ext == NULL || (strcasecmp(ext + 1, ".cbn") != 0 && strcasecmp(ext, ".cbin") != 0))
 897                 return -1;
 898
 899         ret = fread(&ciso_hdr, 1, sizeof(ciso_hdr), cdHandle);
 900         if (ret != sizeof(ciso_hdr)) {
 901                 SysPrintf("failed to read ciso header\n");
 902                 goto fail_io;
 903         }
 904
 905         if (strncmp(ciso_hdr.magic, "CISO", 4) != 0 || ciso_hdr.total_bytes <= 0 || ciso_hdr.block_size <= 0) {
 906                 SysPrintf("bad ciso header\n");
 907                 goto fail_io;
 908         }
 909         if (ciso_hdr.header_size != 0 && ciso_hdr.header_size != sizeof(ciso_hdr)) {
 910                 ret = fseeko(cdHandle, ciso_hdr.header_size, SEEK_SET);
 911                 if (ret != 0) {
 912                         SysPrintf("failed to seek to %x\n", ciso_hdr.header_size);
 913                         goto fail_io;
 914                 }
 915         }
 916
 917         compr_img = calloc(1, sizeof(*compr_img));
 918         if (compr_img == NULL)
 919                 goto fail_io;
 920
 921         compr_img->block_shift = 0;
 922         compr_img->current_block = (unsigned int)-1;
 923
 924         compr_img->index_len = ciso_hdr.total_bytes / ciso_hdr.block_size;
 925         index_table = malloc((compr_img->index_len + 1) * sizeof(index_table[0]));
 926         if (index_table == NULL)
 927                 goto fail_io;
 928
 929         ret = fread(index_table, sizeof(index_table[0]), compr_img->index_len, cdHandle);
 930         if (ret != compr_img->index_len) {
 931                 SysPrintf("failed to read index table\n");
 932                 goto fail_index;
 933         }
 934
 935         compr_img->index_table = malloc((compr_img->index_len + 1) * sizeof(compr_img->index_table[0]));
 936         if (compr_img->index_table == NULL)
 937                 goto fail_index;
 938
 939         for (i = 0; i < compr_img->index_len + 1; i++) {
 940                 index = index_table[i];
 941                 plain = index & 0x80000000;
 942                 index &= 0x7fffffff;
 943                 compr_img->index_table[i] = (off_t)index << ciso_hdr.align;
 944                 if (plain)
 945                         compr_img->index_table[i] |= OFF_T_MSB;
 946         }
 947
 948         return 0;
 949
 950 fail_index:
 951         free(index_table);
 952 fail_io:
 953         if (compr_img != NULL) {
 954                 free(compr_img);
 955                 compr_img = NULL;
 956         }
 957         rewind(cdHandle);
 958         return -1;
 959 }
 960
 961 #ifdef HAVE_CHD
 962 static int handlechd(const char *isofile) {
 963         int frame_offset = 150;
 964         int file_offset = 0;
 965
 966         chd_img = calloc(1, sizeof(*chd_img));
 967         if (chd_img == NULL)
 968                 goto fail_io;
 969
 970         if(chd_open(isofile, CHD_OPEN_READ, NULL, &chd_img->chd) != CHDERR_NONE)
 971                 goto fail_io;
 972
 973         if (Config.CHD_Precache && (chd_precache(chd_img->chd) != CHDERR_NONE))
 974                 goto fail_io;
 975
 976         chd_img->header = chd_get_header(chd_img->chd);
 977
 978         chd_img->buffer = malloc(chd_img->header->hunkbytes * 2);
 979         if (chd_img->buffer == NULL)
 980                 goto fail_io;
 981
 982         chd_img->sectors_per_hunk = chd_img->header->hunkbytes / (CD_FRAMESIZE_RAW + SUB_FRAMESIZE);
 983         chd_img->current_hunk[0] = (unsigned int)-1;
 984         chd_img->current_hunk[1] = (unsigned int)-1;
 985
 986         cddaBigEndian = TRUE;
 987
 988         numtracks = 0;
 989         memset(ti, 0, sizeof(ti));
 990
 991    while (1)
 992    {
 993       struct {
 994          char type[64];
 995          char subtype[32];
 996          char pgtype[32];
 997          char pgsub[32];
 998          uint32_t track;
 999          uint32_t frames;
1000          uint32_t pregap;
1001          uint32_t postgap;
1002       } md = {};
1003       char meta[256];
1004       uint32_t meta_size = 0;
1005
1006       if (chd_get_metadata(chd_img->chd, CDROM_TRACK_METADATA2_TAG, numtracks, meta, sizeof(meta), &meta_size, NULL, NULL) == CHDERR_NONE)
1007          sscanf(meta, CDROM_TRACK_METADATA2_FORMAT, &md.track, md.type, md.subtype, &md.frames, &md.pregap, md.pgtype, md.pgsub, &md.postgap);
1008       else if (chd_get_metadata(chd_img->chd, CDROM_TRACK_METADATA_TAG, numtracks, meta, sizeof(meta), &meta_size, NULL, NULL) == CHDERR_NONE)
1009          sscanf(meta, CDROM_TRACK_METADATA_FORMAT, &md.track, md.type, md.subtype, &md.frames);
1010       else
1011          break;
1012
1013                 SysPrintf("chd: %s\n", meta);
1014
1015                 if (md.track == 1) {
1016                         if (!strncmp(md.subtype, "RW", 2)) {
1017                                 subChanMixed = TRUE;
1018                                 if (!strcmp(md.subtype, "RW_RAW"))
1019                                         subChanRaw = TRUE;
1020                         }
1021                 }
1022
1023                 ti[md.track].type = !strncmp(md.type, "AUDIO", 5) ? CDDA : DATA;
1024
1025                 sec2msf(frame_offset + md.pregap, ti[md.track].start);
1026                 sec2msf(md.frames, ti[md.track].length);
1027
1028                 ti[md.track].start_offset = file_offset + md.pregap;
1029
1030                 // XXX: what about postgap?
1031                 frame_offset += md.frames;
1032                 file_offset += md.frames;
1033                 numtracks++;
1034         }
1035
1036         if (numtracks)
1037                 return 0;
1038
1039 fail_io:
1040         if (chd_img != NULL) {
1041                 free(chd_img->buffer);
1042                 free(chd_img);
1043                 chd_img = NULL;
1044         }
1045         return -1;
1046 }
1047 #endif
1048
1049 // this function tries to get the .sub file of the given .img
1050 static int opensubfile(const char *isoname) {
1051         char            subname[MAXPATHLEN];
1052
1053         // copy name of the iso and change extension from .img to .sub
1054         strncpy(subname, isoname, sizeof(subname));
1055         subname[MAXPATHLEN - 1] = '\0';
1056         if (strlen(subname) >= 4) {
1057                 strcpy(subname + strlen(subname) - 4, ".sub");
1058         }
1059         else {
1060                 return -1;
1061         }
1062
1063         subHandle = fopen(subname, "rb");
1064         if (subHandle == NULL) {
1065                 return -1;
1066         }
1067
1068         return 0;
1069 }
1070
1071 static int opensbifile(const char *isoname) {
1072         char            sbiname[MAXPATHLEN], disknum[MAXPATHLEN] = "0";
1073         int             s;
1074
1075         strncpy(sbiname, isoname, sizeof(sbiname));
1076         sbiname[MAXPATHLEN - 1] = '\0';
1077         if (strlen(sbiname) >= 4) {
1078                 if (cdrIsoMultidiskCount > 1) {
1079                         sprintf(disknum, "_%i.sbi", cdrIsoMultidiskSelect + 1);
1080                         strcpy(sbiname + strlen(sbiname) - 4, disknum);
1081                 }
1082                 else
1083                         strcpy(sbiname + strlen(sbiname) - 4, ".sbi");
1084         }
1085         else {
1086                 return -1;
1087         }
1088
1089         s = msf2sec(ti[1].length);
1090
1091         return LoadSBI(sbiname, s);
1092 }
1093
1094 #if !USE_READ_THREAD
1095 static void readThreadStop() {}
1096 static void readThreadStart() {}
1097 #else
1098 static pthread_t read_thread_id;
1099
1100 static pthread_cond_t read_thread_msg_avail;
1101 static pthread_cond_t read_thread_msg_done;
1102 static pthread_mutex_t read_thread_msg_lock;
1103
1104 static pthread_cond_t sectorbuffer_cond;
1105 static pthread_mutex_t sectorbuffer_lock;
1106
1107 static boolean read_thread_running = FALSE;
1108 static int read_thread_sector_start = -1;
1109 static int read_thread_sector_end = -1;
1110
1111 typedef struct {
1112   int sector;
1113   long ret;
1114   unsigned char data[CD_FRAMESIZE_RAW];
1115 } SectorBufferEntry;
1116
1117 #define SECTOR_BUFFER_SIZE 4096
1118
1119 static SectorBufferEntry *sectorbuffer;
1120 static size_t sectorbuffer_index;
1121
1122 int (*sync_cdimg_read_func)(FILE *f, unsigned int base, void *dest, int sector);
1123 unsigned char *(*sync_CDR_getBuffer)(void);
1124
1125 static unsigned char * CALLBACK ISOgetBuffer_async(void);
1126 static int cdread_async(FILE *f, unsigned int base, void *dest, int sector);
1127
1128 static void *readThreadMain(void *param) {
1129   int max_sector = -1;
1130   int requested_sector_start = -1;
1131   int requested_sector_end = -1;
1132   int last_read_sector = -1;
1133   int index = 0;
1134
1135   int ra_sector = -1;
1136   int max_ra = 128;
1137   int initial_ra = 1;
1138   int speedmult_ra = 4;
1139
1140   int ra_count = 0;
1141   int how_far_ahead = 0;
1142
1143   unsigned char tmpdata[CD_FRAMESIZE_RAW];
1144   long ret;
1145
1146   max_sector = msf2sec(ti[numtracks].start) + msf2sec(ti[numtracks].length);
1147
1148   while(1) {
1149     pthread_mutex_lock(&read_thread_msg_lock);
1150
1151     // If we don't have readahead and we don't have a sector request, wait for one.
1152     // If we still have readahead to go, don't block, just keep going.
1153     // And if we ever have a sector request pending, acknowledge and reset it.
1154
1155     if (!ra_count) {
1156       if (read_thread_sector_start == -1 && read_thread_running) {
1157         pthread_cond_wait(&read_thread_msg_avail, &read_thread_msg_lock);
1158       }
1159     }
1160
1161     if (read_thread_sector_start != -1) {
1162       requested_sector_start = read_thread_sector_start;
1163       requested_sector_end = read_thread_sector_end;
1164       read_thread_sector_start = -1;
1165       read_thread_sector_end = -1;
1166       pthread_cond_signal(&read_thread_msg_done);
1167     }
1168
1169     pthread_mutex_unlock(&read_thread_msg_lock);
1170
1171     if (!read_thread_running)
1172       break;
1173
1174     // Readahead code, based on the implementation in mednafen psx's cdromif.cpp
1175     if (requested_sector_start != -1) {
1176       if (last_read_sector != -1 && last_read_sector == (requested_sector_start - 1)) {
1177         how_far_ahead = ra_sector - requested_sector_end;
1178
1179         if(how_far_ahead <= max_ra)
1180           ra_count = (max_ra - how_far_ahead + 1 ? max_ra - how_far_ahead + 1 : speedmult_ra);
1181         else
1182           ra_count++;
1183       } else if (requested_sector_end != last_read_sector) {
1184         ra_sector = requested_sector_end;
1185         ra_count = initial_ra;
1186       }
1187
1188       last_read_sector = requested_sector_end;
1189     }
1190
1191     index = ra_sector % SECTOR_BUFFER_SIZE;
1192
1193     // check for end of CD
1194     if (ra_count && ra_sector >= max_sector) {
1195       ra_count = 0;
1196       pthread_mutex_lock(&sectorbuffer_lock);
1197       sectorbuffer[index].ret = -1;
1198       sectorbuffer[index].sector = ra_sector;
1199       pthread_cond_signal(&sectorbuffer_cond);
1200       pthread_mutex_unlock(&sectorbuffer_lock);
1201     }
1202
1203     if (ra_count) {
1204       pthread_mutex_lock(&sectorbuffer_lock);
1205       if (sectorbuffer[index].sector != ra_sector) {
1206         pthread_mutex_unlock(&sectorbuffer_lock);
1207
1208         ret = sync_cdimg_read_func(cdHandle, 0, tmpdata, ra_sector);
1209
1210         pthread_mutex_lock(&sectorbuffer_lock);
1211         sectorbuffer[index].ret = ret;
1212         sectorbuffer[index].sector = ra_sector;
1213         memcpy(sectorbuffer[index].data, tmpdata, CD_FRAMESIZE_RAW);
1214       }
1215       pthread_cond_signal(&sectorbuffer_cond);
1216       pthread_mutex_unlock(&sectorbuffer_lock);
1217
1218       ra_sector++;
1219       ra_count--;
1220     }
1221   }
1222
1223   return NULL;
1224 }
1225
1226 static void readThreadStop() {
1227   if (read_thread_running == TRUE) {
1228     read_thread_running = FALSE;
1229     pthread_cond_signal(&read_thread_msg_avail);
1230     pthread_join(read_thread_id, NULL);
1231   }
1232
1233   pthread_cond_destroy(&read_thread_msg_done);
1234   pthread_cond_destroy(&read_thread_msg_avail);
1235   pthread_mutex_destroy(&read_thread_msg_lock);
1236
1237   pthread_cond_destroy(&sectorbuffer_cond);
1238   pthread_mutex_destroy(&sectorbuffer_lock);
1239
1240   CDR_getBuffer = sync_CDR_getBuffer;
1241   cdimg_read_func = sync_cdimg_read_func;
1242
1243   free(sectorbuffer);
1244   sectorbuffer = NULL;
1245 }
1246
1247 static void readThreadStart() {
1248   SysPrintf("Starting async CD thread\n");
1249
1250   if (read_thread_running == TRUE)
1251     return;
1252
1253   read_thread_running = TRUE;
1254   read_thread_sector_start = -1;
1255   read_thread_sector_end = -1;
1256   sectorbuffer_index = 0;
1257
1258   sectorbuffer = calloc(SECTOR_BUFFER_SIZE, sizeof(SectorBufferEntry));
1259   if(!sectorbuffer)
1260     goto error;
1261
1262   sectorbuffer[0].sector = -1; // Otherwise we might think we've already fetched sector 0!
1263
1264   sync_CDR_getBuffer = CDR_getBuffer;
1265   CDR_getBuffer = ISOgetBuffer_async;
1266   sync_cdimg_read_func = cdimg_read_func;
1267   cdimg_read_func = cdread_async;
1268
1269   if (pthread_cond_init(&read_thread_msg_avail, NULL) ||
1270       pthread_cond_init(&read_thread_msg_done, NULL) ||
1271       pthread_mutex_init(&read_thread_msg_lock, NULL) ||
1272       pthread_cond_init(&sectorbuffer_cond, NULL) ||
1273       pthread_mutex_init(&sectorbuffer_lock, NULL) ||
1274       pthread_create(&read_thread_id, NULL, readThreadMain, NULL))
1275     goto error;
1276
1277   return;
1278
1279  error:
1280   SysPrintf("Error starting async CD thread\n");
1281   SysPrintf("Falling back to sync\n");
1282
1283   readThreadStop();
1284 }
1285 #endif
1286
1287 static int cdread_normal(FILE *f, unsigned int base, void *dest, int sector)
1288 {
1289         int ret;
1290         if (!f)
1291                 return -1;
1292         if (fseeko(f, base + sector * CD_FRAMESIZE_RAW, SEEK_SET))
1293                 goto fail_io;
1294         ret = fread(dest, 1, CD_FRAMESIZE_RAW, f);
1295         if (ret <= 0)
1296                 goto fail_io;
1297         return ret;
1298
1299 fail_io:
1300         // often happens in cdda gaps of a split cue/bin, so not logged
1301         //SysPrintf("File IO error %d, base %u, sector %u\n", errno, base, sector);
1302         return -1;
1303 }
1304
1305 static int cdread_sub_mixed(FILE *f, unsigned int base, void *dest, int sector)
1306 {
1307         int ret;
1308
1309         if (!f)
1310                 return -1;
1311         if (fseeko(f, base + sector * (CD_FRAMESIZE_RAW + SUB_FRAMESIZE), SEEK_SET))
1312                 goto fail_io;
1313         ret = fread(dest, 1, CD_FRAMESIZE_RAW, f);
1314         if (ret <= 0)
1315                 goto fail_io;
1316         return ret;
1317
1318 fail_io:
1319         //SysPrintf("File IO error %d, base %u, sector %u\n", errno, base, sector);
1320         return -1;
1321 }
1322
1323 static int cdread_sub_sub_mixed(FILE *f, int sector)
1324 {
1325         if (!f)
1326                 return -1;
1327         if (fseeko(f, sector * (CD_FRAMESIZE_RAW + SUB_FRAMESIZE) + CD_FRAMESIZE_RAW, SEEK_SET))
1328                 goto fail_io;
1329         if (fread(subbuffer, 1, SUB_FRAMESIZE, f) != SUB_FRAMESIZE)
1330                 goto fail_io;
1331
1332         return SUB_FRAMESIZE;
1333
1334 fail_io:
1335         SysPrintf("subchannel: file IO error %d, sector %u\n", errno, sector);
1336         return -1;
1337 }
1338
1339 static int uncompress2_pcsx(void *out, unsigned long *out_size, void *in, unsigned long in_size)
1340 {
1341         static z_stream z;
1342         int ret = 0;
1343
1344         if (z.zalloc == NULL) {
1345                 // XXX: one-time leak here..
1346                 z.next_in = Z_NULL;
1347                 z.avail_in = 0;
1348                 z.zalloc = Z_NULL;
1349                 z.zfree = Z_NULL;
1350                 z.opaque = Z_NULL;
1351                 ret = inflateInit2(&z, -15);
1352         }
1353         else
1354                 ret = inflateReset(&z);
1355         if (ret != Z_OK)
1356                 return ret;
1357
1358         z.next_in = in;
1359         z.avail_in = in_size;
1360         z.next_out = out;
1361         z.avail_out = *out_size;
1362
1363         ret = inflate(&z, Z_NO_FLUSH);
1364         //inflateEnd(&z);
1365
1366         *out_size -= z.avail_out;
1367         return ret == 1 ? 0 : ret;
1368 }
1369
1370 static int cdread_compressed(FILE *f, unsigned int base, void *dest, int sector)
1371 {
1372         unsigned long cdbuffer_size, cdbuffer_size_expect;
1373         unsigned int size;
1374         int is_compressed;
1375         off_t start_byte;
1376         int ret, block;
1377
1378         if (!cdHandle)
1379                 return -1;
1380         if (base)
1381                 sector += base / 2352;
1382
1383         block = sector >> compr_img->block_shift;
1384         compr_img->sector_in_blk = sector & ((1 << compr_img->block_shift) - 1);
1385
1386         if (block == compr_img->current_block) {
1387                 //printf("hit sect %d\n", sector);
1388                 goto finish;
1389         }
1390
1391         if (sector >= compr_img->index_len * 16) {
1392                 SysPrintf("sector %d is past img end\n", sector);
1393                 return -1;
1394         }
1395
1396         start_byte = compr_img->index_table[block] & ~OFF_T_MSB;
1397         if (fseeko(cdHandle, start_byte, SEEK_SET) != 0) {
1398                 SysPrintf("seek error for block %d at %llx: ",
1399                         block, (long long)start_byte);
1400                 perror(NULL);
1401                 return -1;
1402         }
1403
1404         is_compressed = !(compr_img->index_table[block] & OFF_T_MSB);
1405         size = (compr_img->index_table[block + 1] & ~OFF_T_MSB) - start_byte;
1406         if (size > sizeof(compr_img->buff_compressed)) {
1407                 SysPrintf("block %d is too large: %u\n", block, size);
1408                 return -1;
1409         }
1410
1411         if (fread(is_compressed ? compr_img->buff_compressed : compr_img->buff_raw[0],
1412                                 1, size, cdHandle) != size) {
1413                 SysPrintf("read error for block %d at %x: ", block, start_byte);
1414                 perror(NULL);
1415                 return -1;
1416         }
1417
1418         if (is_compressed) {
1419                 cdbuffer_size_expect = sizeof(compr_img->buff_raw[0]) << compr_img->block_shift;
1420                 cdbuffer_size = cdbuffer_size_expect;
1421                 ret = uncompress2_pcsx(compr_img->buff_raw[0], &cdbuffer_size, compr_img->buff_compressed, size);
1422                 if (ret != 0) {
1423                         SysPrintf("uncompress failed with %d for block %d, sector %d\n",
1424                                         ret, block, sector);
1425                         return -1;
1426                 }
1427                 if (cdbuffer_size != cdbuffer_size_expect)
1428                         SysPrintf("cdbuffer_size: %lu != %lu, sector %d\n", cdbuffer_size,
1429                                         cdbuffer_size_expect, sector);
1430         }
1431
1432         // done at last!
1433         compr_img->current_block = block;
1434
1435 finish:
1436         if (dest != cdbuffer) // copy avoid HACK
1437                 memcpy(dest, compr_img->buff_raw[compr_img->sector_in_blk],
1438                         CD_FRAMESIZE_RAW);
1439         return CD_FRAMESIZE_RAW;
1440 }
1441
1442 #ifdef HAVE_CHD
1443 static unsigned char *chd_get_sector(unsigned int current_buffer, unsigned int sector_in_hunk)
1444 {
1445         return chd_img->buffer
1446                 + current_buffer * chd_img->header->hunkbytes
1447                 + sector_in_hunk * (CD_FRAMESIZE_RAW + SUB_FRAMESIZE);
1448 }
1449
1450 static int cdread_chd(FILE *f, unsigned int base, void *dest, int sector)
1451 {
1452         int hunk;
1453
1454         sector += base;
1455
1456         hunk = sector / chd_img->sectors_per_hunk;
1457         chd_img->sector_in_hunk = sector % chd_img->sectors_per_hunk;
1458
1459         if (hunk == chd_img->current_hunk[0])
1460                 chd_img->current_buffer = 0;
1461         else if (hunk == chd_img->current_hunk[1])
1462                 chd_img->current_buffer = 1;
1463         else
1464         {
1465                 chd_read(chd_img->chd, hunk, chd_img->buffer +
1466                         chd_img->current_buffer * chd_img->header->hunkbytes);
1467                 chd_img->current_hunk[chd_img->current_buffer] = hunk;
1468         }
1469
1470         if (dest != cdbuffer) // copy avoid HACK
1471                 memcpy(dest, chd_get_sector(chd_img->current_buffer, chd_img->sector_in_hunk),
1472                         CD_FRAMESIZE_RAW);
1473         return CD_FRAMESIZE_RAW;
1474 }
1475
1476 static int cdread_sub_chd(FILE *f, int sector)
1477 {
1478         unsigned int sector_in_hunk;
1479         unsigned int buffer;
1480         int hunk;
1481
1482         if (!subChanMixed)
1483                 return -1;
1484
1485         hunk = sector / chd_img->sectors_per_hunk;
1486         sector_in_hunk = sector % chd_img->sectors_per_hunk;
1487
1488         if (hunk == chd_img->current_hunk[0])
1489                 buffer = 0;
1490         else if (hunk == chd_img->current_hunk[1])
1491                 buffer = 1;
1492         else
1493         {
1494                 buffer = chd_img->current_buffer ^ 1;
1495                 chd_read(chd_img->chd, hunk, chd_img->buffer +
1496                         buffer * chd_img->header->hunkbytes);
1497                 chd_img->current_hunk[buffer] = hunk;
1498         }
1499
1500         memcpy(subbuffer, chd_get_sector(buffer, sector_in_hunk) + CD_FRAMESIZE_RAW, SUB_FRAMESIZE);
1501         return SUB_FRAMESIZE;
1502 }
1503 #endif
1504
1505 static int cdread_2048(FILE *f, unsigned int base, void *dest, int sector)
1506 {
1507         int ret;
1508
1509         if (!f)
1510                 return -1;
1511         fseeko(f, base + sector * 2048, SEEK_SET);
1512         ret = fread((char *)dest + 12 * 2, 1, 2048, f);
1513
1514         // not really necessary, fake mode 2 header
1515         memset(cdbuffer, 0, 12 * 2);
1516         sec2msf(sector + 2 * 75, (char *)&cdbuffer[12]);
1517         cdbuffer[12 + 3] = 1;
1518
1519         return 12*2 + ret;
1520 }
1521
1522 #if USE_READ_THREAD
1523
1524 static int cdread_async(FILE *f, unsigned int base, void *dest, int sector) {
1525   boolean found = FALSE;
1526   int i = sector % SECTOR_BUFFER_SIZE;
1527   long ret;
1528
1529   if (f != cdHandle || base != 0 || dest != cdbuffer) {
1530     // Async reads are only supported for cdbuffer, so call the sync
1531     // function directly.
1532     return sync_cdimg_read_func(f, base, dest, sector);
1533   }
1534
1535   pthread_mutex_lock(&read_thread_msg_lock);
1536
1537   // Only wait if we're not trying to read the next sector and
1538   // sector_start is set (meaning the last request hasn't been
1539   // processed yet)
1540   while(read_thread_sector_start != -1 && read_thread_sector_end + 1 != sector) {
1541     pthread_cond_wait(&read_thread_msg_done, &read_thread_msg_lock);
1542   }
1543
1544   if (read_thread_sector_start == -1)
1545     read_thread_sector_start = sector;
1546
1547   read_thread_sector_end = sector;
1548   pthread_cond_signal(&read_thread_msg_avail);
1549   pthread_mutex_unlock(&read_thread_msg_lock);
1550
1551   do {
1552     pthread_mutex_lock(&sectorbuffer_lock);
1553     if (sectorbuffer[i].sector == sector) {
1554       sectorbuffer_index = i;
1555       ret = sectorbuffer[i].ret;
1556       found = TRUE;
1557     }
1558
1559     if (!found) {
1560       pthread_cond_wait(&sectorbuffer_cond, &sectorbuffer_lock);
1561     }
1562     pthread_mutex_unlock(&sectorbuffer_lock);
1563   } while (!found);
1564
1565   return ret;
1566 }
1567
1568 #endif
1569
1570 static unsigned char * CALLBACK ISOgetBuffer_compr(void) {
1571         return compr_img->buff_raw[compr_img->sector_in_blk] + 12;
1572 }
1573
1574 #ifdef HAVE_CHD
1575 static unsigned char * CALLBACK ISOgetBuffer_chd(void) {
1576         return chd_get_sector(chd_img->current_buffer, chd_img->sector_in_hunk) + 12;
1577 }
1578 #endif
1579
1580 #if USE_READ_THREAD
1581 static unsigned char * CALLBACK ISOgetBuffer_async(void) {
1582   unsigned char *buffer;
1583   pthread_mutex_lock(&sectorbuffer_lock);
1584   buffer = sectorbuffer[sectorbuffer_index].data;
1585   pthread_mutex_unlock(&sectorbuffer_lock);
1586   return buffer + 12;
1587 }
1588 #endif
1589
1590 unsigned char * CALLBACK ISOgetBuffer(void) {
1591         return cdbuffer + 12;
1592 }
1593
1594 static void PrintTracks(void) {
1595         int i;
1596
1597         for (i = 1; i <= numtracks; i++) {
1598                 SysPrintf(_("Track %.2d (%s) - Start %.2d:%.2d:%.2d, Length %.2d:%.2d:%.2d\n"),
1599                         i, (ti[i].type == DATA ? "DATA" :
1600                             (ti[i].type == CDDA ? "AUDIO" : "UNKNOWN")),
1601                         ti[i].start[0], ti[i].start[1], ti[i].start[2],
1602                         ti[i].length[0], ti[i].length[1], ti[i].length[2]);
1603         }
1604 }
1605
1606 // This function is invoked by the front-end when opening an ISO
1607 // file for playback
1608 static long CALLBACK ISOopen(void) {
1609         boolean isMode1ISO = FALSE;
1610         char alt_bin_filename[MAXPATHLEN];
1611         const char *bin_filename;
1612         char image_str[1024];
1613         off_t size_main;
1614
1615         if (cdHandle || chd_img) {
1616                 return 0; // it's already open
1617         }
1618
1619         cdHandle = fopen(GetIsoFile(), "rb");
1620         if (cdHandle == NULL) {
1621                 SysPrintf(_("Could't open '%s' for reading: %s\n"),
1622                         GetIsoFile(), strerror(errno));
1623                 return -1;
1624         }
1625         size_main = get_size(cdHandle);
1626
1627         snprintf(image_str, sizeof(image_str) - 6*4 - 1,
1628                 "Loaded CD Image: %s", GetIsoFile());
1629
1630         cddaBigEndian = FALSE;
1631         subChanMixed = FALSE;
1632         subChanRaw = FALSE;
1633         pregapOffset = 0;
1634         cdrIsoMultidiskCount = 1;
1635         multifile = 0;
1636
1637         CDR_getBuffer = ISOgetBuffer;
1638         cdimg_read_func = cdread_normal;
1639         cdimg_read_sub_func = NULL;
1640
1641         if (parsetoc(GetIsoFile()) == 0) {
1642                 strcat(image_str, "[+toc]");
1643         }
1644         else if (parseccd(GetIsoFile()) == 0) {
1645                 strcat(image_str, "[+ccd]");
1646         }
1647         else if (parsemds(GetIsoFile()) == 0) {
1648                 strcat(image_str, "[+mds]");
1649         }
1650         else if (parsecue(GetIsoFile()) == 0) {
1651                 strcat(image_str, "[+cue]");
1652         }
1653         if (handlepbp(GetIsoFile()) == 0) {
1654                 strcat(image_str, "[+pbp]");
1655                 CDR_getBuffer = ISOgetBuffer_compr;
1656                 cdimg_read_func = cdread_compressed;
1657         }
1658         else if (handlecbin(GetIsoFile()) == 0) {
1659                 strcat(image_str, "[+cbin]");
1660                 CDR_getBuffer = ISOgetBuffer_compr;
1661                 cdimg_read_func = cdread_compressed;
1662         }
1663 #ifdef HAVE_CHD
1664         else if (handlechd(GetIsoFile()) == 0) {
1665                 strcat(image_str, "[+chd]");
1666                 CDR_getBuffer = ISOgetBuffer_chd;
1667                 cdimg_read_func = cdread_chd;
1668                 cdimg_read_sub_func = cdread_sub_chd;
1669                 fclose(cdHandle);
1670                 cdHandle = NULL;
1671         }
1672 #endif
1673
1674         if (!subChanMixed && opensubfile(GetIsoFile()) == 0) {
1675                 strcat(image_str, "[+sub]");
1676         }
1677         if (opensbifile(GetIsoFile()) == 0) {
1678                 strcat(image_str, "[+sbi]");
1679         }
1680
1681         // maybe user selected metadata file instead of main .bin ..
1682         bin_filename = GetIsoFile();
1683         if (cdHandle && size_main < 2352 * 0x10) {
1684                 static const char *exts[] = { ".bin", ".BIN", ".img", ".IMG" };
1685                 FILE *tmpf = NULL;
1686                 size_t i;
1687                 char *p;
1688
1689                 strncpy(alt_bin_filename, bin_filename, sizeof(alt_bin_filename));
1690                 alt_bin_filename[MAXPATHLEN - 1] = '\0';
1691                 if (strlen(alt_bin_filename) >= 4) {
1692                         p = alt_bin_filename + strlen(alt_bin_filename) - 4;
1693                         for (i = 0; i < sizeof(exts) / sizeof(exts[0]); i++) {
1694                                 strcpy(p, exts[i]);
1695                                 tmpf = fopen(alt_bin_filename, "rb");
1696                                 if (tmpf != NULL)
1697                                         break;
1698                         }
1699                 }
1700                 if (tmpf != NULL) {
1701                         bin_filename = alt_bin_filename;
1702                         fclose(cdHandle);
1703                         cdHandle = tmpf;
1704                         size_main = get_size(cdHandle);
1705                 }
1706         }
1707
1708         // guess whether it is mode1/2048
1709         if (cdHandle && cdimg_read_func == cdread_normal && size_main % 2048 == 0) {
1710                 unsigned int modeTest = 0;
1711                 if (!fread(&modeTest, sizeof(modeTest), 1, cdHandle)) {
1712                         SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
1713                 }
1714                 if (SWAP32(modeTest) != 0xffffff00) {
1715                         strcat(image_str, "[2048]");
1716                         isMode1ISO = TRUE;
1717                 }
1718         }
1719
1720         SysPrintf("%s.\n", image_str);
1721
1722         PrintTracks();
1723
1724         if (subChanMixed && cdimg_read_func == cdread_normal) {
1725                 cdimg_read_func = cdread_sub_mixed;
1726                 cdimg_read_sub_func = cdread_sub_sub_mixed;
1727         }
1728         else if (isMode1ISO) {
1729                 cdimg_read_func = cdread_2048;
1730                 cdimg_read_sub_func = NULL;
1731         }
1732
1733         if (Config.AsyncCD) {
1734                 readThreadStart();
1735         }
1736         return 0;
1737 }
1738
1739 static long CALLBACK ISOclose(void) {
1740         int i;
1741
1742         if (cdHandle != NULL) {
1743                 fclose(cdHandle);
1744                 cdHandle = NULL;
1745         }
1746         if (subHandle != NULL) {
1747                 fclose(subHandle);
1748                 subHandle = NULL;
1749         }
1750         cddaHandle = NULL;
1751
1752         if (compr_img != NULL) {
1753                 free(compr_img->index_table);
1754                 free(compr_img);
1755                 compr_img = NULL;
1756         }
1757
1758 #ifdef HAVE_CHD
1759         if (chd_img != NULL) {
1760                 chd_close(chd_img->chd);
1761                 free(chd_img->buffer);
1762                 free(chd_img);
1763                 chd_img = NULL;
1764         }
1765 #endif
1766
1767         for (i = 1; i <= numtracks; i++) {
1768                 if (ti[i].handle != NULL) {
1769                         fclose(ti[i].handle);
1770                         ti[i].handle = NULL;
1771                 }
1772         }
1773         numtracks = 0;
1774         ti[1].type = 0;
1775         UnloadSBI();
1776
1777         memset(cdbuffer, 0, sizeof(cdbuffer));
1778         CDR_getBuffer = ISOgetBuffer;
1779
1780         if (Config.AsyncCD) {
1781                 readThreadStop();
1782         }
1783
1784         return 0;
1785 }
1786
1787 static long CALLBACK ISOinit(void) {
1788         assert(cdHandle == NULL);
1789         assert(subHandle == NULL);
1790
1791         return 0; // do nothing
1792 }
1793
1794 static long CALLBACK ISOshutdown(void) {
1795         ISOclose();
1796         return 0;
1797 }
1798
1799 // return Starting and Ending Track
1800 // buffer:
1801 //  byte 0 - start track
1802 //  byte 1 - end track
1803 static long CALLBACK ISOgetTN(unsigned char *buffer) {
1804         buffer[0] = 1;
1805
1806         if (numtracks > 0) {
1807                 buffer[1] = numtracks;
1808         }
1809         else {
1810                 buffer[1] = 1;
1811         }
1812
1813         return 0;
1814 }
1815
1816 // return Track Time
1817 // buffer:
1818 //  byte 0 - frame
1819 //  byte 1 - second
1820 //  byte 2 - minute
1821 static long CALLBACK ISOgetTD(unsigned char track, unsigned char *buffer) {
1822         if (track == 0) {
1823                 unsigned int sect;
1824                 unsigned char time[3];
1825                 sect = msf2sec(ti[numtracks].start) + msf2sec(ti[numtracks].length);
1826                 sec2msf(sect, (char *)time);
1827                 buffer[2] = time[0];
1828                 buffer[1] = time[1];
1829                 buffer[0] = time[2];
1830         }
1831         else if (numtracks > 0 && track <= numtracks) {
1832                 buffer[2] = ti[track].start[0];
1833                 buffer[1] = ti[track].start[1];
1834                 buffer[0] = ti[track].start[2];
1835         }
1836         else {
1837                 buffer[2] = 0;
1838                 buffer[1] = 2;
1839                 buffer[0] = 0;
1840         }
1841
1842         return 0;
1843 }
1844
1845 // decode 'raw' subchannel data ripped by cdrdao
1846 static void DecodeRawSubData(void) {
1847         unsigned char subQData[12];
1848         int i;
1849
1850         memset(subQData, 0, sizeof(subQData));
1851
1852         for (i = 0; i < 8 * 12; i++) {
1853                 if (subbuffer[i] & (1 << 6)) { // only subchannel Q is needed
1854                         subQData[i >> 3] |= (1 << (7 - (i & 7)));
1855                 }
1856         }
1857
1858         memcpy(&subbuffer[12], subQData, 12);
1859 }
1860
1861 // read track
1862 // time: byte 0 - minute; byte 1 - second; byte 2 - frame
1863 // uses bcd format
1864 static boolean CALLBACK ISOreadTrack(unsigned char *time) {
1865         int sector = MSF2SECT(btoi(time[0]), btoi(time[1]), btoi(time[2]));
1866         long ret;
1867
1868         if (!cdHandle && !chd_img)
1869                 return 0;
1870
1871         if (pregapOffset && sector >= pregapOffset)
1872                 sector -= 2 * 75;
1873
1874         ret = cdimg_read_func(cdHandle, 0, cdbuffer, sector);
1875         if (ret < 12*2 + 2048)
1876                 return 0;
1877
1878         return 1;
1879 }
1880
1881 // plays cdda audio
1882 // sector: byte 0 - minute; byte 1 - second; byte 2 - frame
1883 // does NOT uses bcd format
1884 static long CALLBACK ISOplay(unsigned char *time) {
1885         return 0;
1886 }
1887
1888 // stops cdda audio
1889 static long CALLBACK ISOstop(void) {
1890         return 0;
1891 }
1892
1893 // gets subchannel data
1894 static unsigned char* CALLBACK ISOgetBufferSub(int sector) {
1895         if (pregapOffset && sector >= pregapOffset) {
1896                 sector -= 2 * 75;
1897                 if (sector < pregapOffset) // ?
1898                         return NULL;
1899         }
1900
1901         if (cdimg_read_sub_func != NULL) {
1902                 if (cdimg_read_sub_func(cdHandle, sector) != SUB_FRAMESIZE)
1903                         return NULL;
1904         }
1905         else if (subHandle != NULL) {
1906                 if (fseeko(subHandle, sector * SUB_FRAMESIZE, SEEK_SET))
1907                         return NULL;
1908                 if (fread(subbuffer, 1, SUB_FRAMESIZE, subHandle) != SUB_FRAMESIZE)
1909                         return NULL;
1910         }
1911         else {
1912                 return NULL;
1913         }
1914
1915         if (subChanRaw) DecodeRawSubData();
1916         return subbuffer;
1917 }
1918
1919 static long CALLBACK ISOgetStatus(struct CdrStat *stat) {
1920         CDR__getStatus(stat);
1921
1922         // BIOS - boot ID (CD type)
1923         stat->Type = ti[1].type;
1924
1925         return 0;
1926 }
1927
1928 // read CDDA sector into buffer
1929 long CALLBACK ISOreadCDDA(unsigned char m, unsigned char s, unsigned char f, unsigned char *buffer) {
1930         unsigned char msf[3] = {m, s, f};
1931         unsigned int track, track_start = 0;
1932         FILE *handle = cdHandle;
1933         unsigned int cddaCurPos;
1934         int ret;
1935
1936         cddaCurPos = msf2sec((char *)msf);
1937
1938         // find current track index
1939         for (track = numtracks; ; track--) {
1940                 track_start = msf2sec(ti[track].start);
1941                 if (track_start <= cddaCurPos)
1942                         break;
1943                 if (track == 1)
1944                         break;
1945         }
1946
1947         // data tracks play silent
1948         if (ti[track].type != CDDA) {
1949                 memset(buffer, 0, CD_FRAMESIZE_RAW);
1950                 return 0;
1951         }
1952
1953         if (multifile) {
1954                 // find the file that contains this track
1955                 unsigned int file;
1956                 for (file = track; file > 1; file--) {
1957                         if (ti[file].handle != NULL) {
1958                                 handle = ti[file].handle;
1959                                 break;
1960                         }
1961                 }
1962         }
1963         if (!handle && !chd_img) {
1964                 memset(buffer, 0, CD_FRAMESIZE_RAW);
1965                 return -1;
1966         }
1967
1968         ret = cdimg_read_func(handle, ti[track].start_offset,
1969                 buffer, cddaCurPos - track_start);
1970         if (ret != CD_FRAMESIZE_RAW) {
1971                 memset(buffer, 0, CD_FRAMESIZE_RAW);
1972                 return -1;
1973         }
1974
1975         if (cddaBigEndian) {
1976                 int i;
1977                 unsigned char tmp;
1978
1979                 for (i = 0; i < CD_FRAMESIZE_RAW / 2; i++) {
1980                         tmp = buffer[i * 2];
1981                         buffer[i * 2] = buffer[i * 2 + 1];
1982                         buffer[i * 2 + 1] = tmp;
1983                 }
1984         }
1985
1986         return 0;
1987 }
1988
1989 void cdrIsoInit(void) {
1990         CDR_init = ISOinit;
1991         CDR_shutdown = ISOshutdown;
1992         CDR_open = ISOopen;
1993         CDR_close = ISOclose;
1994         CDR_getTN = ISOgetTN;
1995         CDR_getTD = ISOgetTD;
1996         CDR_readTrack = ISOreadTrack;
1997         CDR_getBuffer = ISOgetBuffer;
1998         CDR_play = ISOplay;
1999         CDR_stop = ISOstop;
2000         CDR_getBufferSub = ISOgetBufferSub;
2001         CDR_getStatus = ISOgetStatus;
2002         CDR_readCDDA = ISOreadCDDA;
2003
2004         CDR_getDriveLetter = CDR__getDriveLetter;
2005         CDR_configure = CDR__configure;
2006         CDR_test = CDR__test;
2007         CDR_about = CDR__about;
2008         CDR_setfilename = CDR__setfilename;
2009
2010         numtracks = 0;
2011 }
2012
2013 int cdrIsoActive(void) {
2014         return (cdHandle || chd_img);
2015 }