misc/cdrom.c

   1 /* -*- tab-width: 8; c-basic-offset: 4 -*- */
   2 /*
   3  * Main file for CD-ROM support
   4  *
   5  * Copyright 1994 Martin Ayotte
   6  * Copyright 1999 Eric Pouech
   7  * Copyright 2000 Andreas Mohr
   8  */
   9
  10 #include "config.h"
  11
  12 #include <errno.h>
  13 #include <string.h>
  14 #include <fcntl.h>
  15 #include <sys/ioctl.h>
  16 #include "cdrom.h"
  17 #include "drive.h"
  18 #include "debugtools.h"
  19
  20 DEFAULT_DEBUG_CHANNEL(cdrom);
  21
  22 #define MAX_CDAUDIO_TRACKS      256
  23
  24 /**************************************************************************
  25  *                              CDROM_Open                      [internal]
  26  *
  27  * drive = 0, 1, ...
  28  *      or -1 (figure it out)
  29  */
  30 int     CDROM_Open(WINE_CDAUDIO* wcda, int drive)
  31 {
  32     int i;
  33     BOOL avail = FALSE;
  34     const char *dev;
  35
  36     if (drive == -1)
  37     {
  38         for (i=0; i < MAX_DOS_DRIVES; i++)
  39             if (DRIVE_GetType(i) == TYPE_CDROM)
  40             {
  41                 drive = i;
  42                 avail = TRUE;
  43                 break;
  44             }
  45     }
  46     else
  47         avail = TRUE;
  48
  49     if (avail == FALSE)
  50     {
  51         WARN("No CD-ROM #%d found !\n", drive);
  52         return -1;
  53     }
  54     if ((dev = DRIVE_GetDevice(drive)) == NULL)
  55 {
  56         WARN("No device entry for CD-ROM #%d (drive %c:) found !\n",
  57                 drive, 'A' + drive);
  58         return -1;
  59     }
  60
  61     wcda->unixdev = open(dev, O_RDONLY | O_NONBLOCK, 0);
  62     if (wcda->unixdev == -1) {
  63         WARN("can't open '%s'!. %s\n", dev, strerror(errno));
  64         return -1;
  65     }
  66     wcda->cdaMode = WINE_CDA_OPEN;      /* to force reading tracks info */
  67     wcda->nCurTrack = 0;
  68     wcda->nTracks = 0;
  69     wcda->dwFirstFrame = 0;
  70     wcda->dwLastFrame = 0;
  71     wcda->lpdwTrackLen = NULL;
  72     wcda->lpdwTrackPos = NULL;
  73     wcda->lpbTrackFlags = NULL;
  74     return 0;
  75 }
  76
  77 /**************************************************************************
  78  *                              CDROM_GetMediaType              [internal]
  79  */
  80 int     CDROM_GetMediaType(WINE_CDAUDIO* wcda)
  81 {
  82 #ifdef linux
  83     return ioctl(wcda->unixdev, CDROM_DISC_STATUS);
  84 #else
  85     return -1;
  86 #endif
  87 }
  88
  89 /**************************************************************************
  90  *                              CDROM_Close                     [internal]
  91  */
  92 int     CDROM_Close(WINE_CDAUDIO* wcda)
  93 {
  94 #if defined(linux) || defined(__FreeBSD__) || defined(__NetBSD__)
  95     if (wcda->lpdwTrackLen != NULL) free(wcda->lpdwTrackLen);
  96     if (wcda->lpdwTrackPos != NULL) free(wcda->lpdwTrackPos);
  97     if (wcda->lpbTrackFlags != NULL) free(wcda->lpbTrackFlags);
  98     close(wcda->unixdev);
  99     return 0;
 100 #else
 101     return -1;
 102 #endif
 103 }
 104
 105 /**************************************************************************
 106  *                              CDROM_Get_UPC                   [internal]
 107  *
 108  * upc has to be 14 bytes long
 109  */
 110 int CDROM_Get_UPC(WINE_CDAUDIO* wcda, LPSTR upc)
 111 {
 112 #ifdef linux
 113     struct cdrom_mcn mcn;
 114     int status = ioctl(wcda->unixdev, CDROM_GET_MCN, &mcn);
 115     if (status)
 116 {
 117         ERR("ioctl() failed with code %d\n",status);
 118         return -1;
 119     }
 120     strcpy(upc, mcn.medium_catalog_number);
 121     return 0;
 122 #else
 123     return -1;
 124 #endif
 125 }
 126
 127 /**************************************************************************
 128  *                              CDROM_Audio_GetNumberOfTracks   [internal]
 129  */
 130 UINT16 CDROM_Audio_GetNumberOfTracks(WINE_CDAUDIO* wcda)
 131 {
 132 #if defined(linux) || defined(__FreeBSD__) || defined(__NetBSD__)
 133 #ifdef linux
 134     struct cdrom_tochdr         hdr;
 135 #else
 136     struct ioc_toc_header       hdr;
 137 #endif
 138
 139     if (wcda->nTracks == 0) {
 140 #ifdef linux
 141         if (ioctl(wcda->unixdev, CDROMREADTOCHDR, &hdr))
 142 #else
 143         if (ioctl(wcda->unixdev, CDIOREADTOCHEADER, &hdr))
 144 #endif
 145         {
 146             WARN("(%p) -- Error occurred (%d)!\n", wcda, errno);
 147             return (WORD)-1;
 148         }
 149 #ifdef linux
 150         wcda->nFirstTrack = hdr.cdth_trk0;
 151         wcda->nLastTrack  = hdr.cdth_trk1;
 152 #else
 153         wcda->nFirstTrack = hdr.starting_track;
 154         wcda->nLastTrack  = hdr.ending_track;
 155 #endif
 156         wcda->nTracks = wcda->nLastTrack - wcda->nFirstTrack + 1;
 157     }
 158     return wcda->nTracks;
 159 #else
 160     return (WORD)-1;
 161 #endif
 162 }
 163
 164 /**************************************************************************
 165  *                      CDROM_Audio_GetTracksInfo               [internal]
 166  */
 167 BOOL CDROM_Audio_GetTracksInfo(WINE_CDAUDIO* wcda)
 168 {
 169 #if defined(linux) || defined(__FreeBSD__) || defined(__NetBSD__)
 170     int         i, length;
 171     int         start, last_start = 0;
 172     int         total_length = 0;
 173 #ifdef linux
 174     struct cdrom_tocentry       entry;
 175 #else
 176     struct ioc_read_toc_entry   entry;
 177     struct cd_toc_entry         toc_buffer;
 178 #endif
 179
 180     if (wcda->nTracks == 0) {
 181         if (CDROM_Audio_GetNumberOfTracks(wcda) == (WORD)-1) return FALSE;
 182     }
 183     TRACE("nTracks=%u\n", wcda->nTracks);
 184
 185     if (wcda->lpdwTrackLen != NULL)
 186         free(wcda->lpdwTrackLen);
 187     wcda->lpdwTrackLen = (LPDWORD)malloc((wcda->nTracks + 1) * sizeof(DWORD));
 188     if (wcda->lpdwTrackPos != NULL)
 189         free(wcda->lpdwTrackPos);
 190     wcda->lpdwTrackPos = (LPDWORD)malloc((wcda->nTracks + 1) * sizeof(DWORD));
 191     if (wcda->lpbTrackFlags != NULL)
 192         free(wcda->lpbTrackFlags);
 193     wcda->lpbTrackFlags = (LPBYTE)malloc((wcda->nTracks + 1) * sizeof(BYTE));
 194     if (wcda->lpdwTrackLen == NULL || wcda->lpdwTrackPos == NULL ||
 195         wcda->lpbTrackFlags == NULL) {
 196         WARN("error allocating track table !\n");
 197         return FALSE;
 198     }
 199     memset(wcda->lpdwTrackLen, 0, (wcda->nTracks + 1) * sizeof(DWORD));
 200     memset(wcda->lpdwTrackPos, 0, (wcda->nTracks + 1) * sizeof(DWORD));
 201     memset(wcda->lpbTrackFlags, 0, (wcda->nTracks + 1) * sizeof(BYTE));
 202     for (i = 0; i <= wcda->nTracks; i++) {
 203         if (i == wcda->nTracks)
 204 #ifdef linux
 205             entry.cdte_track = CDROM_LEADOUT;
 206 #else
 207 #define LEADOUT 0xaa
 208         entry.starting_track = LEADOUT; /* XXX */
 209 #endif
 210         else
 211 #ifdef linux
 212         entry.cdte_track = i + 1;
 213 #else
 214         entry.starting_track = i + 1;
 215 #endif
 216 #ifdef linux
 217         entry.cdte_format = CDROM_MSF;
 218 #else
 219         bzero((char *)&toc_buffer, sizeof(toc_buffer));
 220         entry.address_format = CD_MSF_FORMAT;
 221         entry.data_len = sizeof(toc_buffer);
 222         entry.data = &toc_buffer;
 223 #endif
 224 #ifdef linux
 225         if (ioctl(wcda->unixdev, CDROMREADTOCENTRY, &entry))
 226 #else
 227         if (ioctl(wcda->unixdev, CDIOREADTOCENTRYS, &entry))
 228 #endif
 229         {
 230             WARN("error read entry (%s)\n", strerror(errno));
 231             /* update status according to new status */
 232             CDROM_Audio_GetCDStatus(wcda);
 233
 234             return FALSE;
 235         }
 236 #ifdef linux
 237         start = CDFRAMES_PERSEC * (SECONDS_PERMIN *
 238                                    entry.cdte_addr.msf.minute + entry.cdte_addr.msf.second) +
 239             entry.cdte_addr.msf.frame;
 240 #else
 241         start = CDFRAMES_PERSEC * (SECONDS_PERMIN *
 242                                    toc_buffer.addr.msf.minute + toc_buffer.addr.msf.second) +
 243             toc_buffer.addr.msf.frame;
 244 #endif
 245         if (i == 0) {
 246             last_start = start;
 247             wcda->dwFirstFrame = start;
 248             TRACE("dwFirstOffset=%u\n", start);
 249         } else {
 250             length = start - last_start;
 251             last_start = start;
 252             start = last_start - length;
 253             total_length += length;
 254             wcda->lpdwTrackLen[i - 1] = length;
 255             wcda->lpdwTrackPos[i - 1] = start;
 256             TRACE("track #%u start=%u len=%u\n", i, start, length);
 257         }
 258 #ifdef linux
 259         wcda->lpbTrackFlags[i] =
 260             (entry.cdte_adr << 4) | (entry.cdte_ctrl & 0x0f);
 261 #else
 262         wcda->lpbTrackFlags[i] =
 263             (toc_buffer.addr_type << 4) | (toc_buffer.control & 0x0f);
 264 #endif
 265         TRACE("track #%u flags=%02x\n", i + 1, wcda->lpbTrackFlags[i]);
 266     }
 267     wcda->dwLastFrame = last_start;
 268     TRACE("total_len=%u\n", total_length);
 269     return TRUE;
 270 #else
 271     return FALSE;
 272 #endif
 273 }
 274
 275 /**************************************************************************
 276  *                              CDROM_Audio_GetCDStatus         [internal]
 277  */
 278 BOOL CDROM_Audio_GetCDStatus(WINE_CDAUDIO* wcda)
 279 {
 280 #if defined(linux) || defined(__FreeBSD__) || defined(__NetBSD__)
 281     int         oldmode = wcda->cdaMode;
 282 #ifdef linux
 283     wcda->sc.cdsc_format = CDROM_MSF;
 284 #else
 285     struct ioc_read_subchannel  read_sc;
 286
 287     read_sc.address_format = CD_MSF_FORMAT;
 288     read_sc.data_format    = CD_CURRENT_POSITION;
 289     read_sc.track          = 0;
 290     read_sc.data_len       = sizeof(wcda->sc);
 291     read_sc.data           = (struct cd_sub_channel_info *)&wcda->sc;
 292 #endif
 293 #ifdef linux
 294     if (ioctl(wcda->unixdev, CDROMSUBCHNL, &wcda->sc))
 295 #else
 296     if (ioctl(wcda->unixdev, CDIOCREADSUBCHANNEL, &read_sc))
 297 #endif
 298     {
 299         TRACE("opened or no_media (%s)!\n", strerror(errno));
 300         wcda->cdaMode = WINE_CDA_OPEN; /* was NOT_READY */
 301         return TRUE;
 302     }
 303     switch (
 304 #ifdef linux
 305             wcda->sc.cdsc_audiostatus
 306 #else
 307             wcda->sc.header.audio_status
 308 #endif
 309             ) {
 310 #ifdef linux
 311     case CDROM_AUDIO_INVALID:
 312 #else
 313     case CD_AS_AUDIO_INVALID:
 314 #endif
 315         WARN("device doesn't support status.\n");
 316         wcda->cdaMode = WINE_CDA_DONTKNOW;
 317         break;
 318 #ifdef linux
 319     case CDROM_AUDIO_NO_STATUS:
 320 #else
 321     case CD_AS_NO_STATUS:
 322 #endif
 323         wcda->cdaMode = WINE_CDA_STOP;
 324         TRACE("WINE_CDA_STOP !\n");
 325         break;
 326 #ifdef linux
 327     case CDROM_AUDIO_PLAY:
 328 #else
 329     case CD_AS_PLAY_IN_PROGRESS:
 330 #endif
 331         wcda->cdaMode = WINE_CDA_PLAY;
 332         break;
 333 #ifdef linux
 334     case CDROM_AUDIO_PAUSED:
 335 #else
 336     case CD_AS_PLAY_PAUSED:
 337 #endif
 338         wcda->cdaMode = WINE_CDA_PAUSE;
 339         TRACE("WINE_CDA_PAUSE !\n");
 340         break;
 341     default:
 342 #ifdef linux
 343         TRACE("status=%02X !\n",
 344               wcda->sc.cdsc_audiostatus);
 345 #else
 346         TRACE("status=%02X !\n",
 347               wcda->sc.header.audio_status);
 348 #endif
 349     }
 350 #ifdef linux
 351     wcda->nCurTrack = wcda->sc.cdsc_trk;
 352     wcda->dwCurFrame =
 353         CDFRAMES_PERMIN * wcda->sc.cdsc_absaddr.msf.minute +
 354         CDFRAMES_PERSEC * wcda->sc.cdsc_absaddr.msf.second +
 355         wcda->sc.cdsc_absaddr.msf.frame;
 356 #else
 357     wcda->nCurTrack = wcda->sc.what.position.track_number;
 358     wcda->dwCurFrame =
 359         CDFRAMES_PERMIN * wcda->sc.what.position.absaddr.msf.minute +
 360         CDFRAMES_PERSEC * wcda->sc.what.position.absaddr.msf.second +
 361         wcda->sc.what.position.absaddr.msf.frame;
 362 #endif
 363 #ifdef linux
 364     TRACE("%02u-%02u:%02u:%02u \n",
 365           wcda->sc.cdsc_trk,
 366           wcda->sc.cdsc_absaddr.msf.minute,
 367           wcda->sc.cdsc_absaddr.msf.second,
 368           wcda->sc.cdsc_absaddr.msf.frame);
 369 #else
 370     TRACE("%02u-%02u:%02u:%02u \n",
 371           wcda->sc.what.position.track_number,
 372           wcda->sc.what.position.absaddr.msf.minute,
 373           wcda->sc.what.position.absaddr.msf.second,
 374           wcda->sc.what.position.absaddr.msf.frame);
 375 #endif
 376
 377     if (oldmode != wcda->cdaMode && oldmode == WINE_CDA_OPEN) {
 378         if (!CDROM_Audio_GetTracksInfo(wcda)) {
 379             WARN("error updating TracksInfo !\n");
 380             return FALSE;
 381         }
 382     }
 383     return TRUE;
 384 #else
 385     return FALSE;
 386 #endif
 387 }
 388
 389 /**************************************************************************
 390  *                              CDROM_Audio_Play                [internal]
 391  */
 392 int     CDROM_Audio_Play(WINE_CDAUDIO* wcda, DWORD start, DWORD end)
 393 {
 394 #if defined(linux) || defined(__FreeBSD__) || defined(__NetBSD__)
 395 #ifdef linux
 396     struct      cdrom_msf       msf;
 397 #else
 398     struct      ioc_play_msf    msf;
 399 #endif
 400
 401 #ifdef linux
 402     msf.cdmsf_min0 = start / CDFRAMES_PERMIN;
 403     msf.cdmsf_sec0 = (start % CDFRAMES_PERMIN) / CDFRAMES_PERSEC;
 404     msf.cdmsf_frame0 = start % CDFRAMES_PERSEC;
 405     msf.cdmsf_min1 = end / CDFRAMES_PERMIN;
 406     msf.cdmsf_sec1 = (end % CDFRAMES_PERMIN) / CDFRAMES_PERSEC;
 407     msf.cdmsf_frame1 = end % CDFRAMES_PERSEC;
 408 #else
 409     msf.start_m     = start / CDFRAMES_PERMIN;
 410     msf.start_s     = (start % CDFRAMES_PERMIN) / CDFRAMES_PERSEC;
 411     msf.start_f     = start % CDFRAMES_PERSEC;
 412     msf.end_m       = end / CDFRAMES_PERMIN;
 413     msf.end_s       = (end % CDFRAMES_PERMIN) / CDFRAMES_PERSEC;
 414     msf.end_f       = end % CDFRAMES_PERSEC;
 415 #endif
 416 #ifdef linux
 417     if (ioctl(wcda->unixdev, CDROMSTART))
 418 #else
 419     if (ioctl(wcda->unixdev, CDIOCSTART, NULL))
 420 #endif
 421     {
 422         WARN("motor doesn't start !\n");
 423         return -1;
 424     }
 425 #ifdef linux
 426     if (ioctl(wcda->unixdev, CDROMPLAYMSF, &msf))
 427 #else
 428     if (ioctl(wcda->unixdev, CDIOCPLAYMSF, &msf))
 429 #endif
 430     {
 431         WARN("device doesn't play !\n");
 432         return -1;
 433     }
 434 #ifdef linux
 435     TRACE("msf = %d:%d:%d %d:%d:%d\n",
 436           msf.cdmsf_min0, msf.cdmsf_sec0, msf.cdmsf_frame0,
 437           msf.cdmsf_min1, msf.cdmsf_sec1, msf.cdmsf_frame1);
 438 #else
 439     TRACE("msf = %d:%d:%d %d:%d:%d\n",
 440           msf.start_m, msf.start_s, msf.start_f,
 441           msf.end_m,   msf.end_s,   msf.end_f);
 442 #endif
 443     return 0;
 444 #else
 445     return -1;
 446 #endif
 447 }
 448
 449 /**************************************************************************
 450  *                              CDROM_Audio_Stop                [internal]
 451  */
 452 int     CDROM_Audio_Stop(WINE_CDAUDIO* wcda)
 453 {
 454 #if defined(linux) || defined(__FreeBSD__) || defined(__NetBSD__)
 455     int ret = 0;
 456 #ifdef linux
 457     ret = ioctl(wcda->unixdev, CDROMSTOP);
 458 #else
 459     ret = ioctl(wcda->unixdev, CDIOCSTOP, NULL);
 460 #endif
 461     return ret;
 462 #else
 463     return -1;
 464 #endif
 465 }
 466
 467 /**************************************************************************
 468  *                              CDROM_Audio_Pause               [internal]
 469  */
 470 int     CDROM_Audio_Pause(WINE_CDAUDIO* wcda, int pauseOn)
 471 {
 472 #if defined(linux) || defined(__FreeBSD__) || defined(__NetBSD__)
 473     int ret = 0;
 474 #ifdef linux
 475     ret = ioctl(wcda->unixdev, pauseOn ? CDROMPAUSE : CDROMRESUME);
 476 #else
 477     ret = ioctl(wcda->unixdev, pauseOn ? CDIOCPAUSE : CDIOCRESUME, NULL);
 478 #endif
 479     return ret;
 480 #else
 481     return -1;
 482 #endif
 483 }
 484
 485 /**************************************************************************
 486  *                              CDROM_Audio_Seek                [internal]
 487  */
 488 int     CDROM_Audio_Seek(WINE_CDAUDIO* wcda, DWORD at)
 489 {
 490 #if defined(linux) || defined(__FreeBSD__) || defined(__NetBSD__)
 491     int                         ret = 0;
 492 #ifdef linux
 493     struct cdrom_msf0           msf;
 494     msf.minute = at / CDFRAMES_PERMIN;
 495     msf.second = (at % CDFRAMES_PERMIN) / CDFRAMES_PERSEC;
 496     msf.frame  = at % CDFRAMES_PERSEC;
 497
 498     ret = ioctl(wcda->unixdev, CDROMSEEK, &msf);
 499 #else
 500    /* FIXME: the current end for play is lost
 501     * use end of CD ROM instead
 502     */
 503    FIXME("Could a BSD expert implement the seek function ?\n");
 504    CDROM_Audio_Play(wcda, at, wcda->lpdwTrackPos[wcda->nTracks] + wcda->lpdwTrackLen[wcda->nTracks]);
 505
 506 #endif
 507     return ret;
 508 #else
 509     return -1;
 510 #endif
 511 }
 512
 513 /**************************************************************************
 514  *                              CDROM_SetDoor                   [internal]
 515  */
 516 int     CDROM_SetDoor(WINE_CDAUDIO* wcda, int open)
 517 {
 518 #if defined(linux) || defined(__FreeBSD__) || defined(__NetBSD__)
 519     int ret = 0;
 520 #ifdef linux
 521     if (open) {
 522         ret = ioctl(wcda->unixdev, CDROMEJECT);
 523     } else {
 524         ret = ioctl(wcda->unixdev, CDROMEJECT, 1);
 525     }
 526 #else
 527     ret = (ioctl(wcda->unixdev, CDIOCALLOW, NULL)) ||
 528         (ioctl(wcda->unixdev, open ? CDIOCEJECT : CDIOCCLOSE, NULL)) ||
 529         (ioctl(wcda->unixdev, CDIOCPREVENT, NULL));
 530 #endif
 531     wcda->nTracks = 0;
 532     return ret;
 533 #else
 534     return -1;
 535 #endif
 536 }
 537
 538 /**************************************************************************
 539  *                              CDROM_Reset                     [internal]
 540  */
 541 int     CDROM_Reset(WINE_CDAUDIO* wcda)
 542 {
 543 #if defined(linux) || defined(__FreeBSD__) || defined(__NetBSD__)
 544     int ret = 0;
 545 #ifdef linux
 546     ret = ioctl(wcda->unixdev, CDROMRESET);
 547 #else
 548     ret = ioctl(wcda->unixdev, CDIOCRESET, NULL);
 549 #endif
 550     return ret;
 551 #else
 552     return -1;
 553 #endif
 554 }
 555
 556 unsigned int get_offs_best_voldesc(int fd)
 557 {
 558     BYTE cur_vd_type, max_vd_type = 0;
 559     unsigned int offs, best_offs = 0;
 560
 561     for (offs=0x8000; offs <= 0x9800; offs += 0x800)
 562     {
 563         lseek(fd, offs, SEEK_SET);
 564         read(fd, &cur_vd_type, 1);
 565         if (cur_vd_type == 0xff)
 566             break;
 567         if (cur_vd_type > max_vd_type)
 568         {
 569             max_vd_type = cur_vd_type;
 570             best_offs = offs;
 571         }
 572     }
 573     return best_offs;
 574 }
 575
 576 /**************************************************************************
 577  *                              CDROM_Audio_GetSerial           [internal]
 578  */
 579 DWORD CDROM_Audio_GetSerial(WINE_CDAUDIO* wcda)
 580 {
 581     unsigned long serial = 0;
 582     int i;
 583     DWORD dwFrame, msf;
 584     WORD wMinutes, wSeconds, wFrames;
 585
 586     for (i = 0; i < wcda->nTracks; i++) {
 587         dwFrame = wcda->lpdwTrackPos[i];
 588         wMinutes = dwFrame / CDFRAMES_PERMIN;
 589         wSeconds = (dwFrame - CDFRAMES_PERMIN * wMinutes) / CDFRAMES_PERSEC;
 590         wFrames = dwFrame - CDFRAMES_PERMIN * wMinutes - CDFRAMES_PERSEC * wSeconds;
 591         msf = CDROM_MAKE_MSF(wMinutes, wSeconds, wFrames);
 592
 593         serial += (CDROM_MSF_MINUTE(msf) << 16) +
 594         (CDROM_MSF_SECOND(msf) << 8) +
 595         (CDROM_MSF_FRAME(msf));
 596     }
 597     return serial;
 598 }
 599
 600 /**************************************************************************
 601  *                              CDROM_Data_GetSerial            [internal]
 602  */
 603 DWORD CDROM_Data_GetSerial(WINE_CDAUDIO* wcda)
 604 {
 605     unsigned int offs = get_offs_best_voldesc(wcda->unixdev);
 606     union {
 607         unsigned long val;
 608         unsigned char p[4];
 609     } serial;
 610
 611     serial.val = 0;
 612     if (offs)
 613     {
 614         BYTE buf[2048];
 615         int i;
 616
 617         lseek(wcda->unixdev,offs,SEEK_SET);
 618         read(wcda->unixdev,buf,2048);
 619         for(i=0; i<2048; i+=4)
 620         {
 621             /* DON'T optimize this into DWORD !! (breaks overflow) */
 622             serial.p[0] += buf[i+0];
 623             serial.p[1] += buf[i+1];
 624             serial.p[2] += buf[i+2];
 625             serial.p[3] += buf[i+3];
 626         }
 627     }
 628     return serial.val;
 629 }
 630
 631 /**************************************************************************
 632  *                              CDROM_GetSerial                 [internal]
 633  */
 634 DWORD CDROM_GetSerial(int drive)
 635 {
 636     WINE_CDAUDIO wcda;
 637     DWORD serial = 0;
 638
 639     /* EXPIRES 01.01.2001 */
 640     FIXME("CD-ROM serial number calculation might fail.\n");
 641     FIXME("Please test with as many exotic CDs as possible !\n");
 642
 643     if (!(CDROM_Open(&wcda, drive)))
 644     {
 645         int media = CDROM_GetMediaType(&wcda);
 646         LPSTR p;
 647
 648         if (media == CDS_AUDIO)
 649         {
 650             if (!(CDROM_Audio_GetCDStatus(&wcda))) {
 651                 ERR("couldn't get CD status !\n");
 652                 CDROM_Close(&wcda);
 653                 return 0;
 654             }
 655             serial = CDROM_Audio_GetSerial(&wcda);
 656         }
 657         else
 658         if (media > CDS_AUDIO)
 659             /* hopefully a data CD */
 660             serial = CDROM_Data_GetSerial(&wcda);
 661
 662         p = (media == CDS_AUDIO) ? "Audio " :
 663             (media > CDS_AUDIO) ? "Data " : "";
 664         if (serial)
 665             FIXME("%sCD serial number is %04x-%04x.\n",
 666                 p, HIWORD(serial), LOWORD(serial));
 667         else
 668             ERR("couldn't get %sCD serial !\n", p);
 669         CDROM_Close(&wcda);
 670     }
 671     return serial;
 672 }
 673