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 "cdrom.h"
  24 #include "cdriso.h"
  25 #include "ppf.h"
  26
  27 #include <assert.h>
  28 #include <errno.h>
  29 #include <zlib.h>
  30 #ifdef HAVE_CHD
  31 #include <libchdr/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 #endif
  41
  42 #ifdef USE_LIBRETRO_VFS
  43 #include <streams/file_stream_transforms.h>
  44 #undef fseeko
  45 #undef ftello
  46 #undef rewind
  47 #define ftello rftell
  48 #define fseeko rfseek
  49 #define rewind(f_) rfseek(f_, 0, SEEK_SET)
  50 #endif
  51
  52 #define OFF_T_MSB ((off_t)1 << (sizeof(off_t) * 8 - 1))
  53
  54 unsigned int cdrIsoMultidiskCount;
  55 unsigned int cdrIsoMultidiskSelect;
  56
  57 static FILE *cdHandle = NULL;
  58 static FILE *subHandle = NULL;
  59
  60 static boolean subChanMixed = FALSE;
  61 static boolean subChanRaw = FALSE;
  62
  63 static boolean multifile = FALSE;
  64
  65 static unsigned char cdbuffer[CD_FRAMESIZE_RAW];
  66
  67 static boolean cddaBigEndian = FALSE;
  68
  69 // compressed image stuff
  70 static struct {
  71         unsigned char buff_raw[16][CD_FRAMESIZE_RAW];
  72         unsigned char buff_compressed[CD_FRAMESIZE_RAW * 16 + 100];
  73         off_t *index_table;
  74         unsigned int index_len;
  75         unsigned int block_shift;
  76         unsigned int current_block;
  77         unsigned int sector_in_blk;
  78 } *compr_img;
  79
  80 #ifdef HAVE_CHD
  81 static struct {
  82         unsigned char *buffer;
  83         chd_file* chd;
  84         const chd_header* header;
  85         unsigned int sectors_per_hunk;
  86         unsigned int current_hunk[2];
  87         unsigned int current_buffer;
  88         unsigned int sector_in_hunk;
  89 } *chd_img;
  90 #else
  91 #define chd_img 0
  92 #endif
  93
  94 static int (*cdimg_read_func)(FILE *f, unsigned int base, void *dest, int sector);
  95 static int (*cdimg_read_sub_func)(FILE *f, int sector, void *dest);
  96
  97 static void DecodeRawSubData(unsigned char *subbuffer);
  98
  99 struct trackinfo {
 100         enum cdrType type;
 101         unsigned int start;        // sector index in toc
 102         unsigned int length;       // readable sectors, excludes gaps
 103         unsigned int start_offset; // byte offset from start of file (chd: sector offset)
 104         FILE *handle;              // for multi-track images
 105 };
 106
 107 #define MAXTRACKS 100 /* How many tracks can a CD hold? */
 108
 109 // 1-based array (indexed [1..numtracks])
 110 static int numtracks = 0;
 111 static struct trackinfo ti[MAXTRACKS];
 112
 113 // get a sector from a msf-array
 114 static unsigned int msf2sec(const void *msf_) {
 115         const unsigned char *msf = msf_;
 116         return ((msf[0] * 60 + msf[1]) * 75) + msf[2];
 117 }
 118
 119 static void sec2msf(unsigned int s, void *msf_) {
 120         unsigned char *msf = msf_;
 121         msf[0] = s / 75 / 60;
 122         s = s - msf[0] * 75 * 60;
 123         msf[1] = s / 75;
 124         s = s - msf[1] * 75;
 125         msf[2] = s;
 126 }
 127
 128 // divide a string of xx:yy:zz into m, s, f
 129 static void tok2msf(char *time, char *msf) {
 130         char *token;
 131
 132         token = strtok(time, ":");
 133         if (token) {
 134                 msf[0] = atoi(token);
 135         }
 136         else {
 137                 msf[0] = 0;
 138         }
 139
 140         token = strtok(NULL, ":");
 141         if (token) {
 142                 msf[1] = atoi(token);
 143         }
 144         else {
 145                 msf[1] = 0;
 146         }
 147
 148         token = strtok(NULL, ":");
 149         if (token) {
 150                 msf[2] = atoi(token);
 151         }
 152         else {
 153                 msf[2] = 0;
 154         }
 155 }
 156
 157 static off_t get_size(FILE *f)
 158 {
 159         off_t old, size;
 160         assert(f);
 161 #if !defined(USE_LIBRETRO_VFS)
 162         struct stat st;
 163         if (fstat(fileno(f), &st) == 0)
 164                 return st.st_size;
 165 #endif
 166         old = ftello(f);
 167         fseeko(f, 0, SEEK_END);
 168         size = ftello(f);
 169         fseeko(f, old, SEEK_SET);
 170         return size;
 171 }
 172
 173 // Some c libs like newlib default buffering to just 1k which is less than
 174 // cd sector size which is bad for performance.
 175 // Note that NULL setvbuf() is implemented differently by different libs
 176 // (newlib mallocs a buffer of given size and glibc ignores size and uses it's own).
 177 static void set_static_stdio_buffer(FILE *f)
 178 {
 179 #if !defined(fopen) // no stdio redirect
 180         static char buf[16 * 1024];
 181         if (f) {
 182                 int r;
 183                 errno = 0;
 184                 r = setvbuf(f, buf, _IOFBF, sizeof(buf));
 185                 if (r)
 186                         SysPrintf("cdriso: setvbuf %d %d\n", r, errno);
 187         }
 188 #endif
 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 = CDRT_DATA;
 267                                 ti[numtracks].start = 2 * 75; // 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 = CDRT_CDDA;
 280                         }
 281                 }
 282                 else if (!strcmp(token, "DATAFILE")) {
 283                         char msf[3];
 284                         if (ti[numtracks].type == CDRT_CDDA) {
 285                                 sscanf(linebuf, "DATAFILE \"%[^\"]\" #%d %8s", name, &t, time2);
 286                                 ti[numtracks].start_offset = t;
 287                                 ti[numtracks].start = t / sector_size + sector_offs;
 288                         }
 289                         else {
 290                                 sscanf(linebuf, "DATAFILE \"%[^\"]\" %8s", name, time2);
 291                         }
 292                         tok2msf(time2, msf);
 293                         ti[numtracks].length = msf2sec(msf);
 294                 }
 295                 else if (!strcmp(token, "FILE")) {
 296                         char msf[3];
 297                         sscanf(linebuf, "FILE \"%[^\"]\" #%d %8s %8s", name, &t, time, time2);
 298                         tok2msf(time, msf);
 299                         t += msf2sec(msf) * sector_size;
 300                         ti[numtracks].start_offset = t;
 301                         ti[numtracks].start = t / sector_size + sector_offs;
 302                         tok2msf(time2, msf);
 303                         ti[numtracks].length = msf2sec(msf);
 304                 }
 305                 else if (!strcmp(token, "ZERO") || !strcmp(token, "SILENCE")) {
 306                         // skip unneeded optional fields
 307                         while (token != NULL) {
 308                                 token = strtok(NULL, " ");
 309                                 if (strchr(token, ':') != NULL)
 310                                         break;
 311                         }
 312                         if (token != NULL) {
 313                                 tok2msf(token, tmp);
 314                                 current_zero_gap = msf2sec(tmp);
 315                         }
 316                         if (numtracks > 1) {
 317                                 t = ti[numtracks - 1].start_offset;
 318                                 t /= sector_size;
 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                                 ti[numtracks].start += t;
 328                         }
 329                 }
 330         }
 331
 332         fclose(fi);
 333
 334         return 0;
 335 }
 336
 337 // this function tries to get the .cue file of the given .bin
 338 // the necessary data is put into the ti (trackinformation)-array
 339 static int parsecue(const char *isofile) {
 340         char                    cuename[MAXPATHLEN];
 341         char                    filepath[MAXPATHLEN];
 342         char                    *incue_fname;
 343         FILE                    *fi;
 344         FILE                    *ftmp = NULL;
 345         char                    *token;
 346         char                    time[20];
 347         char                    *tmp;
 348         char                    linebuf[256], tmpb[256], dummy[256];
 349         unsigned int    incue_max_len;
 350         unsigned int    t, mode, toc_sector;
 351         struct {
 352                 int index[2], pregap, postgap, sector_size;
 353         } tmpinfo[MAXTRACKS];
 354         int i;
 355
 356         numtracks = 0;
 357
 358         // copy name of the iso and change extension from .bin to .cue
 359         strncpy(cuename, isofile, sizeof(cuename));
 360         cuename[MAXPATHLEN - 1] = '\0';
 361         if (strlen(cuename) < 4)
 362                 return -1;
 363         if (strcasecmp(cuename + strlen(cuename) - 4, ".cue") == 0) {
 364                 // it's already open as cdHandle
 365                 fi = cdHandle;
 366         }
 367         else {
 368                 // If 'isofile' is a '.cd<X>' file, use it as a .cue file
 369                 //  and don't try to search the additional .cue file
 370                 if (strncasecmp(cuename + strlen(cuename) - 4, ".cd", 3) != 0 )
 371                         strcpy(cuename + strlen(cuename) - 4, ".cue");
 372
 373                 if ((ftmp = fopen(cuename, "r")) == NULL)
 374                         return -1;
 375                 fi = ftmp;
 376         }
 377
 378         // Some stupid tutorials wrongly tell users to use cdrdao to rip a
 379         // "bin/cue" image, which is in fact a "bin/toc" image. So let's check
 380         // that...
 381         if (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 382                 if (!strncmp(linebuf, "CD_ROM_XA", 9)) {
 383                         // Don't proceed further, as this is actually a .toc file rather
 384                         // than a .cue file.
 385                         if (ftmp)
 386                                 fclose(ftmp);
 387                         return parsetoc(isofile);
 388                 }
 389                 rewind(fi);
 390         }
 391
 392         // build a path for files referenced in .cue
 393         strncpy(filepath, cuename, sizeof(filepath));
 394         tmp = strrchr(filepath, '/');
 395         if (tmp == NULL)
 396                 tmp = strrchr(filepath, '\\');
 397         if (tmp != NULL)
 398                 tmp++;
 399         else
 400                 tmp = filepath;
 401         *tmp = 0;
 402         filepath[sizeof(filepath) - 1] = 0;
 403         incue_fname = tmp;
 404         incue_max_len = sizeof(filepath) - (tmp - filepath) - 1;
 405
 406         memset(&ti, 0, sizeof(ti));
 407
 408         while (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 409                 strncpy(dummy, linebuf, sizeof(linebuf));
 410                 token = strtok(dummy, " ");
 411
 412                 if (token == NULL) {
 413                         continue;
 414                 }
 415
 416                 if (!strcmp(token, "TRACK")) {
 417                         if (numtracks >= MAXTRACKS - 1) {
 418                                 SysPrintf(".cue: too many tracks?\n");
 419                                 break;
 420                         }
 421                         numtracks++;
 422                         memset(&tmpinfo[numtracks], -1, sizeof(tmpinfo[numtracks]));
 423
 424                         if (sscanf(linebuf, " TRACK %02d", &t) == 1 && t != numtracks)
 425                                 SysPrintf(".cue: expected track %d, got %d?\n",
 426                                           numtracks, t);
 427
 428                         if (strstr(linebuf, "AUDIO") != NULL) {
 429                                 ti[numtracks].type = CDRT_CDDA;
 430                                 tmpinfo[numtracks].sector_size = 2352;
 431                         }
 432                         else if (sscanf(linebuf, " TRACK %u MODE%u/%u", &t, &mode,
 433                                         &tmpinfo[numtracks].sector_size) == 3)
 434                                 ti[numtracks].type = CDRT_DATA;
 435                         else {
 436                                 SysPrintf(".cue: failed to parse TRACK\n");
 437                                 ti[numtracks].type = numtracks == 1 ? CDRT_DATA : CDRT_CDDA;
 438                         }
 439                         if (tmpinfo[numtracks].sector_size <= 0)
 440                                 tmpinfo[numtracks].sector_size = 2352;
 441                 }
 442                 else if (!strcmp(token, "INDEX")) {
 443                         unsigned int index;
 444                         char msf[3];
 445                         if (sscanf(linebuf, " INDEX %02d %8s", &index, time) != 2) {
 446                                 SysPrintf(".cue: failed to parse INDEX\n");
 447                                 continue;
 448                         }
 449                         if (index > 1u)
 450                                 continue;
 451                         tok2msf(time, msf);
 452                         tmpinfo[numtracks].index[index] = msf2sec(msf);
 453                 }
 454                 else if (!strcmp(token, "PREGAP")) {
 455                         if (sscanf(linebuf, " PREGAP %8s", time) != 1) {
 456                                 SysPrintf(".cue: failed to parse PREGAP\n");
 457                                 continue;
 458                         }
 459                         tok2msf(time, dummy);
 460                         tmpinfo[numtracks].pregap = msf2sec(dummy);
 461                 }
 462                 else if (!strcmp(token, "POSTGAP")) {
 463                         if (sscanf(linebuf, " POSTGAP %8s", time) != 1) {
 464                                 SysPrintf(".cue: failed to parse POSTGAP\n");
 465                                 continue;
 466                         }
 467                         tok2msf(time, dummy);
 468                         tmpinfo[numtracks].postgap = msf2sec(dummy);
 469                 }
 470                 else if (!strcmp(token, "FILE")) {
 471                         t = sscanf(linebuf, " FILE \"%255[^\"]\"", tmpb);
 472                         if (t != 1)
 473                                 sscanf(linebuf, " FILE %255s", tmpb);
 474
 475                         // absolute path?
 476                         ti[numtracks + 1].handle = fopen(tmpb, "rb");
 477                         if (ti[numtracks + 1].handle == NULL) {
 478                                 // relative to .cue?
 479                                 tmp = strrchr(tmpb, '\\');
 480                                 if (tmp == NULL)
 481                                         tmp = strrchr(tmpb, '/');
 482                                 if (tmp != NULL)
 483                                         tmp++;
 484                                 else
 485                                         tmp = tmpb;
 486                                 strncpy(incue_fname, tmp, incue_max_len);
 487                                 ti[numtracks + 1].handle = fopen(filepath, "rb");
 488                         }
 489                         if (ti[numtracks + 1].handle == NULL) {
 490                                 SysPrintf(_("\ncould not open: %s\n"), filepath);
 491                                 continue;
 492                         }
 493
 494                         if (numtracks + 1 > 1)
 495                                 multifile = 1;
 496                 }
 497         }
 498
 499         if (ftmp)
 500                 fclose(ftmp);
 501
 502         // if there are no tracks detected, then it's not a cue file
 503         if (!numtracks)
 504                 return -1;
 505
 506         for (i = 1; i <= numtracks; i++) {
 507                 if (tmpinfo[i].index[1] == -1) {
 508                         SysPrintf(".cue: no INDEX 01 for track %d?\n", i);
 509                         tmpinfo[i].index[1] = 0;
 510                         if (tmpinfo[i].index[0] != -1)
 511                                 tmpinfo[i].index[1] = tmpinfo[i].index[0] + 2 * 75;
 512                 }
 513         }
 514
 515         // complete the actual toc
 516         tmpinfo[0].postgap = -1;
 517         ftmp = cdHandle;
 518         toc_sector = 2*75;
 519         for (i = 1; i <= numtracks; i++)
 520         {
 521                 unsigned int pregap = 0, sector_size = tmpinfo[i].sector_size;
 522                 // various ways to specify pregap in a .cue
 523                 if (tmpinfo[i].pregap != -1)
 524                         pregap += tmpinfo[i].pregap;
 525                 if (tmpinfo[i-1].postgap != -1)
 526                         pregap += tmpinfo[i-1].postgap;
 527                 if (ti[i].handle && tmpinfo[i].index[0] != -1)
 528                         pregap += tmpinfo[i].index[1] - tmpinfo[i].index[0];
 529
 530                 toc_sector += pregap;
 531                 ti[i].start = toc_sector;
 532                 ti[i].start_offset = tmpinfo[i].index[1] * sector_size;
 533
 534                 if (ti[i].handle)
 535                         ftmp = ti[i].handle;
 536                 if (i+1 <= numtracks && ti[i+1].handle == NULL) {
 537                         // this track and the next one share the backing file
 538                         ti[i].length = tmpinfo[i+1].index[1] - tmpinfo[i].index[1];
 539                 }
 540                 else {
 541                         size_t file_size = get_size(ftmp);
 542                         long left = file_size - ti[i].start_offset;
 543                         if (left > 0)
 544                                 ti[i].length = left / sector_size;
 545                         else
 546                                 ti[i].length = 0;
 547                 }
 548                 toc_sector += ti[i].length;
 549         }
 550
 551         // the data track handle is always in cdHandle
 552         if (ti[1].handle) {
 553                 fclose(cdHandle);
 554                 cdHandle = ti[1].handle;
 555                 ti[1].handle = NULL;
 556                 set_static_stdio_buffer(cdHandle);
 557         }
 558         return 0;
 559 }
 560
 561 // this function tries to get the .ccd file of the given .img
 562 // the necessary data is put into the ti (trackinformation)-array
 563 static int parseccd(const char *isofile) {
 564         char                    ccdname[MAXPATHLEN];
 565         FILE                    *fi;
 566         char                    linebuf[256];
 567         unsigned int    t;
 568
 569         numtracks = 0;
 570
 571         // copy name of the iso and change extension from .img to .ccd
 572         strncpy(ccdname, isofile, sizeof(ccdname));
 573         ccdname[MAXPATHLEN - 1] = '\0';
 574         if (strlen(ccdname) >= 4) {
 575                 strcpy(ccdname + strlen(ccdname) - 4, ".ccd");
 576         }
 577         else {
 578                 return -1;
 579         }
 580
 581         if ((fi = fopen(ccdname, "r")) == NULL) {
 582                 return -1;
 583         }
 584
 585         memset(&ti, 0, sizeof(ti));
 586
 587         while (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 588                 if (!strncmp(linebuf, "[TRACK", 6)){
 589                         numtracks++;
 590                 }
 591                 else if (!strncmp(linebuf, "MODE=", 5)) {
 592                         sscanf(linebuf, "MODE=%d", &t);
 593                         ti[numtracks].type = (t == 0) ? CDRT_CDDA : CDRT_DATA;
 594                 }
 595                 else if (!strncmp(linebuf, "INDEX 1=", 8)) {
 596                         sscanf(linebuf, "INDEX 1=%d", &t);
 597                         ti[numtracks].start = 2 * 75 + t;
 598                         ti[numtracks].start_offset = t * 2352;
 599
 600                         // If we've already seen another track, this is its end
 601                         if (numtracks > 1) {
 602                                 t = ti[numtracks].start - ti[numtracks - 1].start;
 603                                 ti[numtracks - 1].length = t;
 604                         }
 605                 }
 606         }
 607
 608         fclose(fi);
 609
 610         // Fill out the last track's end based on size
 611         if (numtracks >= 1) {
 612                 t = get_size(cdHandle) / 2352 - ti[numtracks].start + 2 * 75;
 613                 ti[numtracks].length = t;
 614         }
 615
 616         return 0;
 617 }
 618
 619 // this function tries to get the .mds file of the given .mdf
 620 // the necessary data is put into the ti (trackinformation)-array
 621 static int parsemds(const char *isofile) {
 622         char                    mdsname[MAXPATHLEN];
 623         FILE                    *fi;
 624         unsigned int    offset, extra_offset, l, i;
 625         unsigned short  s;
 626
 627         numtracks = 0;
 628
 629         // copy name of the iso and change extension from .mdf to .mds
 630         strncpy(mdsname, isofile, sizeof(mdsname));
 631         mdsname[MAXPATHLEN - 1] = '\0';
 632         if (strlen(mdsname) >= 4) {
 633                 strcpy(mdsname + strlen(mdsname) - 4, ".mds");
 634         }
 635         else {
 636                 return -1;
 637         }
 638
 639         if ((fi = fopen(mdsname, "rb")) == NULL) {
 640                 return -1;
 641         }
 642
 643         memset(&ti, 0, sizeof(ti));
 644
 645         // check if it's a valid mds file
 646         if (fread(&i, 1, sizeof(i), fi) != sizeof(i))
 647                 goto fail_io;
 648         i = SWAP32(i);
 649         if (i != 0x4944454D) {
 650                 // not an valid mds file
 651                 fclose(fi);
 652                 return -1;
 653         }
 654
 655         // get offset to session block
 656         fseek(fi, 0x50, SEEK_SET);
 657         if (fread(&offset, 1, sizeof(offset), fi) != sizeof(offset))
 658                 goto fail_io;
 659         offset = SWAP32(offset);
 660
 661         // get total number of tracks
 662         offset += 14;
 663         fseek(fi, offset, SEEK_SET);
 664         if (fread(&s, 1, sizeof(s), fi) != sizeof(s))
 665                 goto fail_io;
 666         s = SWAP16(s);
 667         numtracks = s;
 668
 669         // get offset to track blocks
 670         fseek(fi, 4, SEEK_CUR);
 671         if (fread(&offset, 1, sizeof(offset), fi) != sizeof(offset))
 672                 goto fail_io;
 673         offset = SWAP32(offset);
 674
 675         // skip lead-in data
 676         while (1) {
 677                 fseek(fi, offset + 4, SEEK_SET);
 678                 if (fgetc(fi) < 0xA0) {
 679                         break;
 680                 }
 681                 offset += 0x50;
 682         }
 683
 684         // check if the image contains mixed subchannel data
 685         fseek(fi, offset + 1, SEEK_SET);
 686         subChanMixed = subChanRaw = (fgetc(fi) ? TRUE : FALSE);
 687
 688         // read track data
 689         for (i = 1; i <= numtracks; i++) {
 690                 char msf[3];
 691                 fseek(fi, offset, SEEK_SET);
 692
 693                 // get the track type
 694                 ti[i].type = (fgetc(fi) == 0xA9) ? CDRT_CDDA : CDRT_DATA;
 695                 fseek(fi, 8, SEEK_CUR);
 696
 697                 // get the track starting point
 698                 msf[0] = fgetc(fi);
 699                 msf[1] = fgetc(fi);
 700                 msf[2] = fgetc(fi);
 701                 ti[i].start = msf2sec(msf);
 702
 703                 if (fread(&extra_offset, 1, sizeof(extra_offset), fi) != sizeof(extra_offset))
 704                         goto fail_io;
 705                 extra_offset = SWAP32(extra_offset);
 706
 707                 // get track start offset (in .mdf)
 708                 fseek(fi, offset + 0x28, SEEK_SET);
 709                 if (fread(&l, 1, sizeof(l), fi) != sizeof(l))
 710                         goto fail_io;
 711                 l = SWAP32(l);
 712                 ti[i].start_offset = l;
 713
 714                 // get pregap
 715                 fseek(fi, extra_offset, SEEK_SET);
 716                 if (fread(&l, 1, sizeof(l), fi) != sizeof(l))
 717                         goto fail_io;
 718                 l = SWAP32(l);
 719
 720                 // get the track length
 721                 if (fread(&l, 1, sizeof(l), fi) != sizeof(l))
 722                         goto fail_io;
 723                 ti[i].length = SWAP32(l);
 724
 725                 offset += 0x50;
 726         }
 727         fclose(fi);
 728         return 0;
 729 fail_io:
 730 #ifndef NDEBUG
 731         SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
 732 #endif
 733         fclose(fi);
 734         return -1;
 735 }
 736
 737 static int handlepbp(const char *isofile) {
 738         struct {
 739                 unsigned int sig;
 740                 unsigned int dontcare[8];
 741                 unsigned int psar_offs;
 742         } pbp_hdr;
 743         struct {
 744                 unsigned char type;
 745                 unsigned char pad0;
 746                 unsigned char track;
 747                 char index0[3];
 748                 char pad1;
 749                 char index1[3];
 750         } toc_entry;
 751         struct {
 752                 unsigned int offset;
 753                 unsigned int size;
 754                 unsigned int dontcare[6];
 755         } index_entry;
 756         char psar_sig[11];
 757         off_t psisoimg_offs, cdimg_base;
 758         unsigned int cd_length;
 759         unsigned int offsettab[8];
 760         unsigned int psar_offs, index_entry_size, index_entry_offset;
 761         const char *ext = NULL;
 762         int i, ret;
 763
 764         if (strlen(isofile) >= 4)
 765                 ext = isofile + strlen(isofile) - 4;
 766         if (ext == NULL || strcasecmp(ext, ".pbp") != 0)
 767                 return -1;
 768
 769         numtracks = 0;
 770
 771         ret = fread(&pbp_hdr, 1, sizeof(pbp_hdr), cdHandle);
 772         if (ret != sizeof(pbp_hdr)) {
 773                 SysPrintf("failed to read pbp\n");
 774                 goto fail_io;
 775         }
 776
 777         psar_offs = SWAP32(pbp_hdr.psar_offs);
 778
 779         ret = fseeko(cdHandle, psar_offs, SEEK_SET);
 780         if (ret != 0) {
 781                 SysPrintf("failed to seek to %x\n", psar_offs);
 782                 goto fail_io;
 783         }
 784
 785         psisoimg_offs = psar_offs;
 786         if (fread(psar_sig, 1, sizeof(psar_sig), cdHandle) != sizeof(psar_sig))
 787                 goto fail_io;
 788         psar_sig[10] = 0;
 789         if (strcmp(psar_sig, "PSTITLEIMG") == 0) {
 790                 // multidisk image?
 791                 ret = fseeko(cdHandle, psar_offs + 0x200, SEEK_SET);
 792                 if (ret != 0) {
 793                         SysPrintf("failed to seek to %x\n", psar_offs + 0x200);
 794                         goto fail_io;
 795                 }
 796
 797                 if (fread(&offsettab, 1, sizeof(offsettab), cdHandle) != sizeof(offsettab)) {
 798                         SysPrintf("failed to read offsettab\n");
 799                         goto fail_io;
 800                 }
 801
 802                 for (i = 0; i < sizeof(offsettab) / sizeof(offsettab[0]); i++) {
 803                         if (offsettab[i] == 0)
 804                                 break;
 805                 }
 806                 cdrIsoMultidiskCount = i;
 807                 if (cdrIsoMultidiskCount == 0) {
 808                         SysPrintf("multidisk eboot has 0 images?\n");
 809                         goto fail_io;
 810                 }
 811
 812                 if (cdrIsoMultidiskSelect >= cdrIsoMultidiskCount)
 813                         cdrIsoMultidiskSelect = 0;
 814
 815                 psisoimg_offs += SWAP32(offsettab[cdrIsoMultidiskSelect]);
 816
 817                 ret = fseeko(cdHandle, psisoimg_offs, SEEK_SET);
 818                 if (ret != 0) {
 819                         SysPrintf("failed to seek to %llx\n", (long long)psisoimg_offs);
 820                         goto fail_io;
 821                 }
 822
 823                 if (fread(psar_sig, 1, sizeof(psar_sig), cdHandle) != sizeof(psar_sig))
 824                         goto fail_io;
 825                 psar_sig[10] = 0;
 826         }
 827
 828         if (strcmp(psar_sig, "PSISOIMG00") != 0) {
 829                 SysPrintf("bad psar_sig: %s\n", psar_sig);
 830                 goto fail_io;
 831         }
 832
 833         // seek to TOC
 834         ret = fseeko(cdHandle, psisoimg_offs + 0x800, SEEK_SET);
 835         if (ret != 0) {
 836                 SysPrintf("failed to seek to %llx\n", (long long)psisoimg_offs + 0x800);
 837                 goto fail_io;
 838         }
 839
 840         // first 3 entries are special
 841         fseek(cdHandle, sizeof(toc_entry), SEEK_CUR);
 842         if (fread(&toc_entry, 1, sizeof(toc_entry), cdHandle) != sizeof(toc_entry))
 843                 goto fail_io;
 844         numtracks = btoi(toc_entry.index1[0]);
 845
 846         if (fread(&toc_entry, 1, sizeof(toc_entry), cdHandle) != sizeof(toc_entry))
 847                 goto fail_io;
 848         cd_length = btoi(toc_entry.index1[0]) * 60 * 75 +
 849                 btoi(toc_entry.index1[1]) * 75 + btoi(toc_entry.index1[2]);
 850
 851         for (i = 1; i <= numtracks; i++) {
 852                 char msf[3];
 853                 if (fread(&toc_entry, 1, sizeof(toc_entry), cdHandle) != sizeof(toc_entry))
 854                         goto fail_io;
 855
 856                 ti[i].type = (toc_entry.type == 1) ? CDRT_CDDA : CDRT_DATA;
 857
 858                 ti[i].start_offset = btoi(toc_entry.index0[0]) * 60 * 75 +
 859                         btoi(toc_entry.index0[1]) * 75 + btoi(toc_entry.index0[2]);
 860                 ti[i].start_offset *= 2352;
 861                 msf[0] = btoi(toc_entry.index1[0]);
 862                 msf[1] = btoi(toc_entry.index1[1]);
 863                 msf[2] = btoi(toc_entry.index1[2]);
 864                 ti[i].start = msf2sec(msf);
 865
 866                 if (i > 1)
 867                         ti[i - 1].length = ti[i].start - ti[i - 1].start;
 868         }
 869         ti[numtracks].length = cd_length - ti[numtracks].start_offset / 2352;
 870
 871         // seek to ISO index
 872         ret = fseeko(cdHandle, psisoimg_offs + 0x4000, SEEK_SET);
 873         if (ret != 0) {
 874                 SysPrintf("failed to seek to ISO index\n");
 875                 goto fail_io;
 876         }
 877
 878         compr_img = calloc(1, sizeof(*compr_img));
 879         if (compr_img == NULL)
 880                 goto fail_io;
 881
 882         compr_img->block_shift = 4;
 883         compr_img->current_block = (unsigned int)-1;
 884
 885         compr_img->index_len = (0x100000 - 0x4000) / sizeof(index_entry);
 886         compr_img->index_table = malloc((compr_img->index_len + 1) * sizeof(compr_img->index_table[0]));
 887         if (compr_img->index_table == NULL)
 888                 goto fail_io;
 889
 890         cdimg_base = psisoimg_offs + 0x100000;
 891         for (i = 0; i < compr_img->index_len; i++) {
 892                 ret = fread(&index_entry, 1, sizeof(index_entry), cdHandle);
 893                 if (ret != sizeof(index_entry)) {
 894                         SysPrintf("failed to read index_entry #%d\n", i);
 895                         goto fail_index;
 896                 }
 897
 898                 index_entry_size = SWAP32(index_entry.size);
 899                 index_entry_offset = SWAP32(index_entry.offset);
 900
 901                 if (index_entry_size == 0)
 902                         break;
 903
 904                 compr_img->index_table[i] = cdimg_base + index_entry_offset;
 905         }
 906         compr_img->index_table[i] = cdimg_base + index_entry_offset + index_entry_size;
 907
 908         return 0;
 909
 910 fail_index:
 911         free(compr_img->index_table);
 912         compr_img->index_table = NULL;
 913         goto done;
 914
 915 fail_io:
 916         SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
 917         rewind(cdHandle);
 918
 919 done:
 920         if (compr_img != NULL) {
 921                 free(compr_img);
 922                 compr_img = NULL;
 923         }
 924         return -1;
 925 }
 926
 927 static int handlecbin(const char *isofile) {
 928         struct
 929         {
 930                 char magic[4];
 931                 unsigned int header_size;
 932                 unsigned long long total_bytes;
 933                 unsigned int block_size;
 934                 unsigned char ver;              // 1
 935                 unsigned char align;
 936                 unsigned char rsv_06[2];
 937         } ciso_hdr;
 938         const char *ext = NULL;
 939         unsigned int *index_table = NULL;
 940         unsigned int index = 0, plain;
 941         int i, ret;
 942
 943         if (strlen(isofile) >= 5)
 944                 ext = isofile + strlen(isofile) - 5;
 945         if (ext == NULL || (strcasecmp(ext + 1, ".cbn") != 0 && strcasecmp(ext, ".cbin") != 0))
 946                 return -1;
 947
 948         ret = fread(&ciso_hdr, 1, sizeof(ciso_hdr), cdHandle);
 949         if (ret != sizeof(ciso_hdr)) {
 950                 SysPrintf("failed to read ciso header\n");
 951                 goto fail_io;
 952         }
 953
 954         if (strncmp(ciso_hdr.magic, "CISO", 4) != 0 || ciso_hdr.total_bytes <= 0 || ciso_hdr.block_size <= 0) {
 955                 SysPrintf("bad ciso header\n");
 956                 goto fail_io;
 957         }
 958         if (ciso_hdr.header_size != 0 && ciso_hdr.header_size != sizeof(ciso_hdr)) {
 959                 ret = fseeko(cdHandle, ciso_hdr.header_size, SEEK_SET);
 960                 if (ret != 0) {
 961                         SysPrintf("failed to seek to %x\n", ciso_hdr.header_size);
 962                         goto fail_io;
 963                 }
 964         }
 965
 966         compr_img = calloc(1, sizeof(*compr_img));
 967         if (compr_img == NULL)
 968                 goto fail_io;
 969
 970         compr_img->block_shift = 0;
 971         compr_img->current_block = (unsigned int)-1;
 972
 973         compr_img->index_len = ciso_hdr.total_bytes / ciso_hdr.block_size;
 974         index_table = malloc((compr_img->index_len + 1) * sizeof(index_table[0]));
 975         if (index_table == NULL)
 976                 goto fail_io;
 977
 978         ret = fread(index_table, sizeof(index_table[0]), compr_img->index_len, cdHandle);
 979         if (ret != compr_img->index_len) {
 980                 SysPrintf("failed to read index table\n");
 981                 goto fail_index;
 982         }
 983
 984         compr_img->index_table = malloc((compr_img->index_len + 1) * sizeof(compr_img->index_table[0]));
 985         if (compr_img->index_table == NULL)
 986                 goto fail_index;
 987
 988         for (i = 0; i < compr_img->index_len + 1; i++) {
 989                 index = index_table[i];
 990                 plain = index & 0x80000000;
 991                 index &= 0x7fffffff;
 992                 compr_img->index_table[i] = (off_t)index << ciso_hdr.align;
 993                 if (plain)
 994                         compr_img->index_table[i] |= OFF_T_MSB;
 995         }
 996
 997         // fixup the toc and the last track length
 998         if (numtracks == 0) {
 999                 numtracks = 1;
1000                 ti[1].type = CDRT_DATA;
1001                 ti[1].start_offset = 0;
1002                 ti[1].start = 2 * 75;
1003         }
1004         ti[numtracks].length = (ciso_hdr.total_bytes - ti[numtracks].start_offset) / 2352;
1005         free(index_table);
1006         return 0;
1007
1008 fail_index:
1009         free(index_table);
1010 fail_io:
1011         if (compr_img != NULL) {
1012                 free(compr_img);
1013                 compr_img = NULL;
1014         }
1015         rewind(cdHandle);
1016         return -1;
1017 }
1018
1019 #ifdef HAVE_CHD
1020 static int handlechd(const char *isofile) {
1021         int frame_offset = 150;
1022         int file_offset = 0;
1023         int is_chd_ext = 0;
1024         chd_error err;
1025
1026         if (strlen(isofile) >= 3) {
1027                 const char *ext = isofile + strlen(isofile) - 3;
1028                 is_chd_ext = !strcasecmp(ext, "chd");
1029         }
1030         chd_img = calloc(1, sizeof(*chd_img));
1031         if (chd_img == NULL)
1032                 goto fail_io;
1033
1034         err = chd_open_file(cdHandle, CHD_OPEN_READ, NULL, &chd_img->chd);
1035         if (err != CHDERR_NONE) {
1036                 if (is_chd_ext)
1037                         SysPrintf("chd_open: %d\n", err);
1038                 goto fail_io;
1039         }
1040
1041         if (Config.CHD_Precache && (chd_precache(chd_img->chd) != CHDERR_NONE))
1042                 goto fail_io;
1043
1044         chd_img->header = chd_get_header(chd_img->chd);
1045
1046         chd_img->buffer = malloc(chd_img->header->hunkbytes * 2);
1047         if (chd_img->buffer == NULL)
1048                 goto fail_io;
1049
1050         chd_img->sectors_per_hunk = chd_img->header->hunkbytes / (CD_FRAMESIZE_RAW + SUB_FRAMESIZE);
1051         chd_img->current_hunk[0] = (unsigned int)-1;
1052         chd_img->current_hunk[1] = (unsigned int)-1;
1053
1054         cddaBigEndian = TRUE;
1055
1056         numtracks = 0;
1057         memset(ti, 0, sizeof(ti));
1058
1059         while (1)
1060         {
1061                 struct {
1062                         char type[64];
1063                         char subtype[32];
1064                         char pgtype[32];
1065                         char pgsub[32];
1066                         uint32_t track;
1067                         uint32_t frames;
1068                         uint32_t pregap;
1069                         uint32_t postgap;
1070                 } md = {};
1071                 char meta[256];
1072                 uint32_t meta_size = 0;
1073
1074                 if (chd_get_metadata(chd_img->chd, CDROM_TRACK_METADATA2_TAG, numtracks, meta, sizeof(meta), &meta_size, NULL, NULL) == CHDERR_NONE)
1075                         sscanf(meta, CDROM_TRACK_METADATA2_FORMAT, &md.track, md.type, md.subtype, &md.frames, &md.pregap, md.pgtype, md.pgsub, &md.postgap);
1076                 else if (chd_get_metadata(chd_img->chd, CDROM_TRACK_METADATA_TAG, numtracks, meta, sizeof(meta), &meta_size, NULL, NULL) == CHDERR_NONE)
1077                         sscanf(meta, CDROM_TRACK_METADATA_FORMAT, &md.track, md.type, md.subtype, &md.frames);
1078                 else
1079                         break;
1080
1081                 SysPrintf("chd: %s\n", meta);
1082
1083                 if (md.track == 1) {
1084                         if (!strncmp(md.subtype, "RW", 2)) {
1085                                 subChanMixed = TRUE;
1086                                 if (!strcmp(md.subtype, "RW_RAW"))
1087                                         subChanRaw = TRUE;
1088                         }
1089                 }
1090
1091                 ti[md.track].type = !strncmp(md.type, "AUDIO", 5) ? CDRT_CDDA : CDRT_DATA;
1092
1093                 ti[md.track].start = frame_offset + md.pregap;
1094                 ti[md.track].length = md.frames;
1095
1096                 ti[md.track].start_offset = file_offset + md.pregap;
1097
1098                 // XXX: what about postgap?
1099                 frame_offset += md.frames;
1100                 file_offset += md.frames;
1101                 numtracks++;
1102         }
1103
1104         if (numtracks)
1105                 return 0;
1106
1107 fail_io:
1108         if (chd_img != NULL) {
1109                 free(chd_img->buffer);
1110                 free(chd_img);
1111                 chd_img = NULL;
1112         }
1113         return -1;
1114 }
1115 #endif
1116
1117 // this function tries to get the .sub file of the given .img
1118 static int opensubfile(const char *isoname) {
1119         char            subname[MAXPATHLEN];
1120
1121         // copy name of the iso and change extension from .img to .sub
1122         strncpy(subname, isoname, sizeof(subname));
1123         subname[MAXPATHLEN - 1] = '\0';
1124         if (strlen(subname) >= 4) {
1125                 strcpy(subname + strlen(subname) - 4, ".sub");
1126         }
1127         else {
1128                 return -1;
1129         }
1130
1131         subHandle = fopen(subname, "rb");
1132         if (subHandle == NULL)
1133                 return -1;
1134
1135         return 0;
1136 }
1137
1138 static int opensbifile(const char *isoname) {
1139         char            sbiname[MAXPATHLEN], disknum[MAXPATHLEN] = "0";
1140
1141         strncpy(sbiname, isoname, sizeof(sbiname));
1142         sbiname[MAXPATHLEN - 1] = '\0';
1143         if (strlen(sbiname) >= 4) {
1144                 if (cdrIsoMultidiskCount > 1) {
1145                         sprintf(disknum, "_%i.sbi", cdrIsoMultidiskSelect + 1);
1146                         strcpy(sbiname + strlen(sbiname) - 4, disknum);
1147                 }
1148                 else
1149                         strcpy(sbiname + strlen(sbiname) - 4, ".sbi");
1150         }
1151         else {
1152                 return -1;
1153         }
1154
1155         return LoadSBI(sbiname, ti[1].length);
1156 }
1157
1158 static int cdread_normal(FILE *f, unsigned int base, void *dest, int sector)
1159 {
1160         int ret;
1161         if (!f)
1162                 return -1;
1163         if (!dest)
1164                 dest = cdbuffer;
1165         if (fseeko(f, base + sector * CD_FRAMESIZE_RAW, SEEK_SET))
1166                 goto fail_io;
1167         ret = fread(dest, 1, CD_FRAMESIZE_RAW, f);
1168         if (ret <= 0)
1169                 goto fail_io;
1170         return ret;
1171
1172 fail_io:
1173         // often happens in cdda gaps of a split cue/bin, so not logged
1174         //SysPrintf("File IO error %d, base %u, sector %u\n", errno, base, sector);
1175         return -1;
1176 }
1177
1178 static int cdread_sub_mixed(FILE *f, unsigned int base, void *dest, int sector)
1179 {
1180         int ret;
1181
1182         if (!f)
1183                 return -1;
1184         if (!dest)
1185                 dest = cdbuffer;
1186         if (fseeko(f, base + sector * (CD_FRAMESIZE_RAW + SUB_FRAMESIZE), SEEK_SET))
1187                 goto fail_io;
1188         ret = fread(dest, 1, CD_FRAMESIZE_RAW, f);
1189         if (ret <= 0)
1190                 goto fail_io;
1191         return ret;
1192
1193 fail_io:
1194         //SysPrintf("File IO error %d, base %u, sector %u\n", errno, base, sector);
1195         return -1;
1196 }
1197
1198 static int cdread_sub_sub_mixed(FILE *f, int sector, void *buffer)
1199 {
1200         if (!f)
1201                 return -1;
1202         if (fseeko(f, sector * (CD_FRAMESIZE_RAW + SUB_FRAMESIZE) + CD_FRAMESIZE_RAW, SEEK_SET))
1203                 goto fail_io;
1204         if (fread(buffer, 1, SUB_FRAMESIZE, f) != SUB_FRAMESIZE)
1205                 goto fail_io;
1206
1207         return 0;
1208
1209 fail_io:
1210         SysPrintf("subchannel: file IO error %d, sector %u\n", errno, sector);
1211         return -1;
1212 }
1213
1214 static int uncompress2_pcsx(void *out, unsigned long *out_size, void *in, unsigned long in_size)
1215 {
1216         static z_stream z;
1217         int ret = 0;
1218
1219         if (z.zalloc == NULL) {
1220                 // XXX: one-time leak here..
1221                 z.next_in = Z_NULL;
1222                 z.avail_in = 0;
1223                 z.zalloc = Z_NULL;
1224                 z.zfree = Z_NULL;
1225                 z.opaque = Z_NULL;
1226                 ret = inflateInit2(&z, -15);
1227         }
1228         else
1229                 ret = inflateReset(&z);
1230         if (ret != Z_OK)
1231                 return ret;
1232
1233         z.next_in = in;
1234         z.avail_in = in_size;
1235         z.next_out = out;
1236         z.avail_out = *out_size;
1237
1238         ret = inflate(&z, Z_NO_FLUSH);
1239         //inflateEnd(&z);
1240
1241         *out_size -= z.avail_out;
1242         return ret == 1 ? 0 : ret;
1243 }
1244
1245 static int cdread_compressed(FILE *f, unsigned int base, void *dest, int sector)
1246 {
1247         unsigned long cdbuffer_size, cdbuffer_size_expect;
1248         unsigned int size;
1249         int is_compressed;
1250         off_t start_byte;
1251         int ret, block;
1252
1253         if (!cdHandle)
1254                 return -1;
1255         if (base)
1256                 sector += base / 2352;
1257
1258         block = sector >> compr_img->block_shift;
1259         compr_img->sector_in_blk = sector & ((1 << compr_img->block_shift) - 1);
1260
1261         if (block == compr_img->current_block) {
1262                 //printf("hit sect %d\n", sector);
1263                 goto finish;
1264         }
1265
1266         if (sector >= compr_img->index_len * 16) {
1267                 SysPrintf("sector %d is past img end\n", sector);
1268                 return -1;
1269         }
1270
1271         start_byte = compr_img->index_table[block] & ~OFF_T_MSB;
1272         if (fseeko(cdHandle, start_byte, SEEK_SET) != 0) {
1273                 SysPrintf("seek error for block %d at %llx: ",
1274                         block, (long long)start_byte);
1275                 perror(NULL);
1276                 return -1;
1277         }
1278
1279         is_compressed = !(compr_img->index_table[block] & OFF_T_MSB);
1280         size = (compr_img->index_table[block + 1] & ~OFF_T_MSB) - start_byte;
1281         if (size > sizeof(compr_img->buff_compressed)) {
1282                 SysPrintf("block %d is too large: %u\n", block, size);
1283                 return -1;
1284         }
1285
1286         if (fread(is_compressed ? compr_img->buff_compressed : compr_img->buff_raw[0],
1287                                 1, size, cdHandle) != size) {
1288                 SysPrintf("read error for block %d at %lx: ", block, (long)start_byte);
1289                 perror(NULL);
1290                 return -1;
1291         }
1292
1293         if (is_compressed) {
1294                 cdbuffer_size_expect = sizeof(compr_img->buff_raw[0]) << compr_img->block_shift;
1295                 cdbuffer_size = cdbuffer_size_expect;
1296                 ret = uncompress2_pcsx(compr_img->buff_raw[0], &cdbuffer_size, compr_img->buff_compressed, size);
1297                 if (ret != 0) {
1298                         SysPrintf("uncompress failed with %d for block %d, sector %d\n",
1299                                         ret, block, sector);
1300                         return -1;
1301                 }
1302                 if (cdbuffer_size != cdbuffer_size_expect)
1303                         SysPrintf("cdbuffer_size: %lu != %lu, sector %d\n", cdbuffer_size,
1304                                         cdbuffer_size_expect, sector);
1305         }
1306
1307         // done at last!
1308         compr_img->current_block = block;
1309
1310 finish:
1311         if (dest != NULL)
1312                 memcpy(dest, compr_img->buff_raw[compr_img->sector_in_blk],
1313                         CD_FRAMESIZE_RAW);
1314         return CD_FRAMESIZE_RAW;
1315 }
1316
1317 #ifdef HAVE_CHD
1318 static unsigned char *chd_get_sector(unsigned int current_buffer, unsigned int sector_in_hunk)
1319 {
1320         return chd_img->buffer
1321                 + current_buffer * chd_img->header->hunkbytes
1322                 + sector_in_hunk * (CD_FRAMESIZE_RAW + SUB_FRAMESIZE);
1323 }
1324
1325 static int cdread_chd(FILE *f, unsigned int base, void *dest, int sector)
1326 {
1327         int hunk;
1328
1329         sector += base;
1330
1331         hunk = sector / chd_img->sectors_per_hunk;
1332         chd_img->sector_in_hunk = sector % chd_img->sectors_per_hunk;
1333
1334         if (hunk == chd_img->current_hunk[0])
1335                 chd_img->current_buffer = 0;
1336         else if (hunk == chd_img->current_hunk[1])
1337                 chd_img->current_buffer = 1;
1338         else
1339         {
1340                 chd_read(chd_img->chd, hunk, chd_img->buffer +
1341                         chd_img->current_buffer * chd_img->header->hunkbytes);
1342                 chd_img->current_hunk[chd_img->current_buffer] = hunk;
1343         }
1344
1345         if (dest != NULL)
1346                 memcpy(dest, chd_get_sector(chd_img->current_buffer, chd_img->sector_in_hunk),
1347                         CD_FRAMESIZE_RAW);
1348         return CD_FRAMESIZE_RAW;
1349 }
1350
1351 static int cdread_sub_chd(FILE *f, int sector, void *buffer_ptr)
1352 {
1353         unsigned int sector_in_hunk;
1354         unsigned int buffer;
1355         int hunk;
1356
1357         if (!subChanMixed)
1358                 return -1;
1359
1360         hunk = sector / chd_img->sectors_per_hunk;
1361         sector_in_hunk = sector % chd_img->sectors_per_hunk;
1362
1363         if (hunk == chd_img->current_hunk[0])
1364                 buffer = 0;
1365         else if (hunk == chd_img->current_hunk[1])
1366                 buffer = 1;
1367         else
1368         {
1369                 buffer = chd_img->current_buffer ^ 1;
1370                 chd_read(chd_img->chd, hunk, chd_img->buffer +
1371                         buffer * chd_img->header->hunkbytes);
1372                 chd_img->current_hunk[buffer] = hunk;
1373         }
1374
1375         memcpy(buffer_ptr, chd_get_sector(buffer, sector_in_hunk) + CD_FRAMESIZE_RAW, SUB_FRAMESIZE);
1376         return 0;
1377 }
1378 #endif
1379
1380 static int cdread_2048(FILE *f, unsigned int base, void *dest, int sector)
1381 {
1382         unsigned char *dst = dest ? dest : cdbuffer;
1383         int ret;
1384
1385         if (!f)
1386                 return -1;
1387
1388         fseeko(f, base + sector * 2048, SEEK_SET);
1389         ret = fread(dst + 12 * 2, 1, 2048, f);
1390
1391         // not really necessary, fake mode 2 header
1392         memset(dst, 0, 12 * 2);
1393         sec2msf(sector + 2 * 75, dst + 12);
1394         dst[12 + 0] = itob(dst[12 + 0]);
1395         dst[12 + 1] = itob(dst[12 + 1]);
1396         dst[12 + 2] = itob(dst[12 + 2]);
1397         dst[12 + 3] = 1;
1398
1399         return 12*2 + ret;
1400 }
1401
1402 static void * ISOgetBuffer_normal(void) {
1403        return cdbuffer + 12;
1404 }
1405
1406 static void * ISOgetBuffer_compr(void) {
1407        return compr_img->buff_raw[compr_img->sector_in_blk] + 12;
1408 }
1409
1410 #ifdef HAVE_CHD
1411 static void * ISOgetBuffer_chd(void) {
1412        return chd_get_sector(chd_img->current_buffer, chd_img->sector_in_hunk) + 12;
1413 }
1414 #endif
1415
1416 void * (*ISOgetBuffer)(void) = ISOgetBuffer_normal;
1417
1418 static void PrintTracks(void) {
1419         unsigned char msfe[3];
1420         int i;
1421
1422         for (i = 1; i <= numtracks; i++) {
1423                 unsigned char start[3], length[3];
1424                 sec2msf(ti[i].start, start);
1425                 sec2msf(ti[i].length, length);
1426                 SysPrintf(_("Track %.2d %s - Start %.2d:%.2d:%.2d, Length %.2d:%.2d:%.2d\n"),
1427                         i,  (ti[i].type == CDRT_DATA ? "DATA " :
1428                             (ti[i].type == CDRT_CDDA ? "AUDIO" : "UNKNOWN")),
1429                         start[0], start[1], start[2], length[0], length[1], length[2]);
1430         }
1431         i = ti[numtracks].start + ti[numtracks].length;
1432         sec2msf(i, msfe);
1433         SysPrintf("End %.2d:%.2d:%.2d (sector %d)\n", msfe[0], msfe[1], msfe[2], i);
1434 }
1435
1436 // This function is invoked by the front-end when opening an ISO
1437 // file for playback
1438 int ISOopen(const char *fname)
1439 {
1440         boolean isMode1ISO = FALSE;
1441         char alt_bin_filename[MAXPATHLEN];
1442         const char *bin_filename;
1443         char image_str[1024];
1444         off_t size_main;
1445
1446         if (cdHandle || chd_img) {
1447                 return 0; // it's already open
1448         }
1449
1450         cdHandle = fopen(fname, "rb");
1451         if (cdHandle == NULL) {
1452                 SysPrintf(_("Could't open '%s' for reading: %s\n"),
1453                         fname, strerror(errno));
1454                 return -1;
1455         }
1456         set_static_stdio_buffer(cdHandle);
1457         size_main = get_size(cdHandle);
1458
1459         snprintf(image_str, sizeof(image_str) - 6*4 - 1,
1460                 "Loaded CD Image: %s", fname);
1461
1462         cddaBigEndian = FALSE;
1463         subChanMixed = FALSE;
1464         subChanRaw = FALSE;
1465         cdrIsoMultidiskCount = 1;
1466         multifile = 0;
1467
1468         ISOgetBuffer = ISOgetBuffer_normal;
1469         cdimg_read_func = cdread_normal;
1470         cdimg_read_sub_func = NULL;
1471
1472         if (parsetoc(fname) == 0) {
1473                 strcat(image_str, "[+toc]");
1474         }
1475         else if (parseccd(fname) == 0) {
1476                 strcat(image_str, "[+ccd]");
1477         }
1478         else if (parsemds(fname) == 0) {
1479                 strcat(image_str, "[+mds]");
1480         }
1481         else if (parsecue(fname) == 0) {
1482                 strcat(image_str, "[+cue]");
1483         }
1484         if (handlepbp(fname) == 0) {
1485                 strcat(image_str, "[+pbp]");
1486                 ISOgetBuffer = ISOgetBuffer_compr;
1487                 cdimg_read_func = cdread_compressed;
1488         }
1489         else if (handlecbin(fname) == 0) {
1490                 strcat(image_str, "[+cbin]");
1491                 ISOgetBuffer = ISOgetBuffer_compr;
1492                 cdimg_read_func = cdread_compressed;
1493         }
1494 #ifdef HAVE_CHD
1495         else if (handlechd(fname) == 0) {
1496                 strcat(image_str, "[+chd]");
1497                 ISOgetBuffer = ISOgetBuffer_chd;
1498                 cdimg_read_func = cdread_chd;
1499                 cdimg_read_sub_func = cdread_sub_chd;
1500         }
1501 #endif
1502
1503         if (!subChanMixed && opensubfile(fname) == 0) {
1504                 strcat(image_str, "[+sub]");
1505         }
1506         if (opensbifile(fname) == 0) {
1507                 strcat(image_str, "[+sbi]");
1508         }
1509
1510         // maybe user selected metadata file instead of main .bin ..
1511         bin_filename = fname;
1512         if (cdHandle && size_main < 2352 * 0x10) {
1513                 static const char *exts[] = { ".bin", ".BIN", ".img", ".IMG" };
1514                 FILE *tmpf = NULL;
1515                 size_t i;
1516                 char *p;
1517
1518                 strncpy(alt_bin_filename, bin_filename, sizeof(alt_bin_filename));
1519                 alt_bin_filename[MAXPATHLEN - 1] = '\0';
1520                 if (strlen(alt_bin_filename) >= 4) {
1521                         p = alt_bin_filename + strlen(alt_bin_filename) - 4;
1522                         for (i = 0; i < sizeof(exts) / sizeof(exts[0]); i++) {
1523                                 strcpy(p, exts[i]);
1524                                 tmpf = fopen(alt_bin_filename, "rb");
1525                                 if (tmpf != NULL)
1526                                         break;
1527                         }
1528                 }
1529                 if (tmpf != NULL) {
1530                         bin_filename = alt_bin_filename;
1531                         fclose(cdHandle);
1532                         cdHandle = tmpf;
1533                         set_static_stdio_buffer(cdHandle);
1534                         size_main = get_size(cdHandle);
1535                 }
1536         }
1537
1538         // guess whether it is mode1/2048
1539         if (cdHandle && cdimg_read_func == cdread_normal && size_main % 2048 == 0) {
1540                 unsigned int modeTest = 0;
1541                 if (!fread(&modeTest, sizeof(modeTest), 1, cdHandle)) {
1542                         SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
1543                 }
1544                 if (SWAP32(modeTest) != 0xffffff00) {
1545                         strcat(image_str, "[2048]");
1546                         isMode1ISO = TRUE;
1547                 }
1548         }
1549         if (cdHandle && numtracks == 0) {
1550                 // assume some metadata-less format
1551                 numtracks = 1;
1552                 ti[1].type = CDRT_DATA;
1553                 ti[1].start_offset = 0;
1554                 ti[1].start = 2 * 75;
1555                 ti[1].length = isMode1ISO ? size_main / 2048u : size_main / 2352u;
1556         }
1557
1558         SysPrintf("%s (%lld bytes).\n", image_str, (long long)size_main);
1559
1560         PrintTracks();
1561
1562         if (subChanMixed && cdimg_read_func == cdread_normal) {
1563                 cdimg_read_func = cdread_sub_mixed;
1564                 cdimg_read_sub_func = cdread_sub_sub_mixed;
1565         }
1566         else if (isMode1ISO) {
1567                 cdimg_read_func = cdread_2048;
1568                 cdimg_read_sub_func = NULL;
1569         }
1570
1571         return 0;
1572 }
1573
1574 int ISOclose(void)
1575 {
1576         int i;
1577
1578         if (cdHandle != NULL) {
1579                 fclose(cdHandle);
1580                 cdHandle = NULL;
1581         }
1582         if (subHandle != NULL) {
1583                 fclose(subHandle);
1584                 subHandle = NULL;
1585         }
1586
1587         if (compr_img != NULL) {
1588                 free(compr_img->index_table);
1589                 free(compr_img);
1590                 compr_img = NULL;
1591         }
1592
1593 #ifdef HAVE_CHD
1594         if (chd_img != NULL) {
1595                 chd_close(chd_img->chd);
1596                 free(chd_img->buffer);
1597                 free(chd_img);
1598                 chd_img = NULL;
1599         }
1600 #endif
1601
1602         for (i = 1; i <= numtracks; i++) {
1603                 if (ti[i].handle != NULL) {
1604                         fclose(ti[i].handle);
1605                         ti[i].handle = NULL;
1606                 }
1607         }
1608         numtracks = 0;
1609         ti[1].type = CDRT_UNKNOWN;
1610         UnloadSBI();
1611
1612         memset(cdbuffer, 0, sizeof(cdbuffer));
1613         ISOgetBuffer = ISOgetBuffer_normal;
1614
1615         return 0;
1616 }
1617
1618 int ISOinit(void)
1619 {
1620         assert(cdHandle == NULL);
1621         assert(subHandle == NULL);
1622         numtracks = 0;
1623
1624         return 0; // do nothing
1625 }
1626
1627 int ISOshutdown(void)
1628 {
1629         return ISOclose();
1630 }
1631
1632 // return Starting and Ending Track
1633 // buffer:
1634 //  byte 0 - start track
1635 //  byte 1 - end track
1636 int ISOgetTN(unsigned char *buffer)
1637 {
1638         buffer[0] = 1;
1639
1640         if (numtracks > 0) {
1641                 buffer[1] = numtracks;
1642         }
1643         else {
1644                 buffer[1] = 1;
1645         }
1646
1647         return 0;
1648 }
1649
1650 // return Track Time
1651 // buffer:
1652 //  byte 0 - minute
1653 //  byte 1 - second
1654 //  byte 2 - frame
1655 int ISOgetTD(int track, unsigned char *buffer)
1656 {
1657         if (track == 0) {
1658                 sec2msf(ti[numtracks].start + ti[numtracks].length, buffer);
1659         }
1660         else if (numtracks > 0 && track <= numtracks) {
1661                 sec2msf(ti[track].start, buffer);
1662         }
1663         else {
1664                 buffer[2] = 0;
1665                 buffer[1] = 2;
1666                 buffer[0] = 0;
1667         }
1668
1669         return 0;
1670 }
1671
1672 // decode 'raw' subchannel data ripped by cdrdao
1673 static void DecodeRawSubData(unsigned char *subbuffer) {
1674         unsigned char subQData[12];
1675         int i;
1676
1677         memset(subQData, 0, sizeof(subQData));
1678
1679         for (i = 0; i < 8 * 12; i++) {
1680                 if (subbuffer[i] & (1 << 6)) { // only subchannel Q is needed
1681                         subQData[i >> 3] |= (1 << (7 - (i & 7)));
1682                 }
1683         }
1684
1685         memcpy(&subbuffer[12], subQData, 12);
1686 }
1687
1688 // read track
1689 // time: byte 0 - minute; byte 1 - second; byte 2 - frame (non-bcd)
1690 // buf: if NULL, data is kept in internal buffer accessible by ISOgetBuffer()
1691 int ISOreadTrack(const unsigned char *time, void *buf)
1692 {
1693         int sector = msf2sec(time);
1694         long ret;
1695
1696         if (!cdHandle && !chd_img)
1697                 return -1;
1698
1699         if (sector >= ti[1].start + ti[1].length &&
1700             numtracks > 1 && ti[2].type == CDRT_CDDA) {
1701                 return ISOreadCDDA(time, buf);
1702         }
1703
1704         sector -= 2 * 75;
1705
1706         ret = cdimg_read_func(cdHandle, 0, buf, sector);
1707         if (ret < 12*2 + 2048)
1708                 return -1;
1709
1710         return 0;
1711 }
1712
1713 // read subchannel data
1714 int ISOreadSub(const unsigned char *time, void *buffer)
1715 {
1716         int ret, sector = msf2sec(time);
1717
1718         if (sector >= ti[1].start + ti[1].length) {
1719                 // for tracks 2+ use the fake data, otherwise
1720                 // it becomes too messy to handle all the gap stuff
1721                 return -1;
1722         }
1723         sector -= 2 * 75;
1724
1725         if (cdimg_read_sub_func != NULL) {
1726                 if ((ret = cdimg_read_sub_func(cdHandle, sector, buffer)))
1727                         return ret;
1728         }
1729         else if (subHandle != NULL) {
1730                 if (fseeko(subHandle, sector * SUB_FRAMESIZE, SEEK_SET))
1731                         return -1;
1732                 if (fread(buffer, 1, SUB_FRAMESIZE, subHandle) != SUB_FRAMESIZE)
1733                         return -1;
1734         }
1735         else {
1736                 return -1;
1737         }
1738
1739         if (subChanRaw)
1740                 DecodeRawSubData(buffer);
1741         return 0;
1742 }
1743
1744 int ISOgetStatus(struct CdrStat *stat)
1745 {
1746         CDR__getStatus(stat);
1747
1748         // BIOS - boot ID (CD type)
1749         stat->Type = ti[1].type;
1750
1751         return 0;
1752 }
1753
1754 // read CDDA sector into buffer
1755 int ISOreadCDDA(const unsigned char *time, void *buffer)
1756 {
1757         unsigned int track, track_start = 0;
1758         FILE *handle = cdHandle;
1759         unsigned int cddaCurPos;
1760         int ret, ret_clear = -1;
1761
1762         cddaCurPos = msf2sec(time);
1763
1764         // find current track index
1765         for (track = numtracks; ; track--) {
1766                 track_start = ti[track].start;
1767                 if (track_start <= cddaCurPos)
1768                         break;
1769                 if (track == 1)
1770                         break;
1771         }
1772
1773         if (track == numtracks && cddaCurPos >= ti[track].start + ti[track].length)
1774                 return -1;
1775         if (ti[track].type != CDRT_CDDA) {
1776                 // data tracks play silent
1777                 ret_clear = 0;
1778                 goto clear_return;
1779         }
1780         if (track < numtracks && cddaCurPos >= ti[track].start + ti[track].length) {
1781                 // gap
1782                 ret_clear = 0;
1783                 goto clear_return;
1784         }
1785
1786         if (multifile) {
1787                 // find the file that contains this track
1788                 unsigned int file;
1789                 for (file = track; file > 1; file--) {
1790                         if (ti[file].handle != NULL) {
1791                                 handle = ti[file].handle;
1792                                 break;
1793                         }
1794                 }
1795         }
1796         if (!handle && !chd_img)
1797                 goto clear_return;
1798
1799         ret = cdimg_read_func(handle, ti[track].start_offset,
1800                 buffer, cddaCurPos - track_start);
1801         if (ret != CD_FRAMESIZE_RAW)
1802                 goto clear_return;
1803
1804         if (cddaBigEndian && buffer) {
1805                 unsigned char tmp, *buf = buffer;
1806                 int i;
1807
1808                 for (i = 0; i < CD_FRAMESIZE_RAW / 2; i++) {
1809                         tmp = buf[i * 2];
1810                         buf[i * 2] = buf[i * 2 + 1];
1811                         buf[i * 2 + 1] = tmp;
1812                 }
1813         }
1814
1815         return 0;
1816
1817 clear_return:
1818         if (buffer)
1819                 memset(buffer, 0, CD_FRAMESIZE_RAW);
1820         return ret_clear;
1821 }