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