path: root/lib/driver/MSWindows/win32.c

/*
  Copyright (C) 2003, 2004, 2005, 2006, 2008, 2010, 2011, 2012
  Rocky Bernstein <rocky@gnu.org>

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/* This file contains Win32-specific code and implements low-level 
   control of the CD drive. Inspired by vlc's cdrom.h code 
*/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#ifdef HAVE_STDBOOL_H
# include <stdbool.h>
#endif 

#include <cdio/cdio.h>
#include <cdio/sector.h>
#include <cdio/util.h>
#include <cdio/mmc.h>
#include <cdio/logging.h>
#include "cdio_assert.h"
#include "cdio_private.h" /* protoype for cdio_is_device_win32 */

#include <string.h>

#ifdef HAVE_WIN32_CDROM

#include <ctype.h>
#include <stdio.h>

#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif

#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif

#include <windows.h>
#include <winioctl.h>
#include "win32.h"

#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif

#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#if defined (_MSC_VER) || defined (_XBOX)
#undef IN
#else
#include "aspi32.h"
#endif

#ifdef _XBOX
#include "stdint.h"
#include <xtl.h>
#define WIN_NT 1
#else
#define WIN_NT               ( GetVersion() < 0x80000000 )
#endif

/*!
  Set the volume of an audio CD.
  
  @param p_cdio the CD object to be acted upon.
  
*/
static driver_return_code_t
audio_get_volume_win32 ( void *p_user_data, 
			 /*out*/ cdio_audio_volume_t *p_volume)
{
  if ( WIN_NT ) {
    return audio_get_volume_win32ioctl (p_user_data, p_volume);
  } else {
    return DRIVER_OP_UNSUPPORTED; /* not yet, but soon I hope */
  }
}

/*!
  Pause playing CD through analog output
  
  @param p_cdio the CD object to be acted upon.
*/
static driver_return_code_t 
audio_pause_win32 (void *p_user_data)
{
  if ( WIN_NT ) {
    return audio_pause_win32ioctl (p_user_data);
  } else {
    return DRIVER_OP_UNSUPPORTED; /* not yet, but soon I hope */
  }
}

/*!
  Playing CD through analog output at the given MSF.
  
  @param p_cdio the CD object to be acted upon.
*/
static driver_return_code_t 
audio_play_msf_win32 (void *p_user_data, msf_t *p_start_msf, msf_t *p_end_msf)
{
  if ( WIN_NT ) {
    return audio_play_msf_win32ioctl (p_user_data, p_start_msf, p_end_msf);
  } else {
    return DRIVER_OP_UNSUPPORTED; /* not yet, but soon I hope */
  }
}

/*!
  Read Audio Subchannel information
  
  @param p_cdio the CD object to be acted upon.
  
*/
static driver_return_code_t
audio_read_subchannel_win32 (void *p_user_data, 
			     cdio_subchannel_t *p_subchannel)
{
  if ( WIN_NT ) {
    return audio_read_subchannel_win32ioctl (p_user_data, p_subchannel);
  } else {
    return audio_read_subchannel_mmc(p_user_data, p_subchannel);
  }
}

  /*!
    Resume playing an audio CD.
    
    @param p_cdio the CD object to be acted upon.

  */
static driver_return_code_t 
audio_resume_win32 (void *p_user_data)
{
  if ( WIN_NT ) {
    return audio_resume_win32ioctl (p_user_data);
  } else {
    return DRIVER_OP_UNSUPPORTED; /* not yet, but soon I hope */
  }
}

/*!
  Set the volume of an audio CD.
  
  @param p_cdio the CD object to be acted upon.
  
*/
static driver_return_code_t
audio_set_volume_win32 ( void *p_user_data, cdio_audio_volume_t *p_volume)
{
  if ( WIN_NT ) {
    return audio_set_volume_win32ioctl (p_user_data, p_volume);
  } else {
    return DRIVER_OP_UNSUPPORTED; /* not yet, but soon I hope */
  }
}

static driver_return_code_t
audio_stop_win32 ( void *p_user_data)
{
  if ( WIN_NT ) {
    return audio_stop_win32ioctl (p_user_data);
  } else {
    return DRIVER_OP_UNSUPPORTED; /* not yet, but soon I hope */
  }
}

/* General ioctl() CD-ROM command function */
static bool 
_cdio_mciSendCommand(int id, UINT msg, DWORD flags, void *arg)
{
#ifdef _XBOX
  return false;
#else
  MCIERROR mci_error;
  
  mci_error = mciSendCommand(id, msg, flags, (DWORD_PTR)arg);
  if ( mci_error ) {
    char error[256];
    
    mciGetErrorString(mci_error, error, 256);
    cdio_warn("mciSendCommand() error: %s", error);
  }
  return(mci_error == 0);
#endif
}

static access_mode_t 
str_to_access_mode_win32(const char *psz_access_mode) 
{
  const access_mode_t default_access_mode = 
    WIN_NT ? _AM_IOCTL : _AM_ASPI;

  if (NULL==psz_access_mode) return default_access_mode;
  
  if (!strcmp(psz_access_mode, "ioctl"))
    return _AM_IOCTL;
  else if (!strcmp(psz_access_mode, "ASPI")) {
#ifdef _XBOX
    cdio_warn ("XBOX doesn't support access type: %s. Default used instead.", 
	       psz_access_mode);
    return default_access_mode;
#else 
    return _AM_ASPI;
#endif    
  } else if (!strcmp(psz_access_mode, "MMC_RDWR")) {
    return _AM_MMC_RDWR;
  } else if (!strcmp(psz_access_mode, "MMC_RDWR_EXCL")) {
    return _AM_MMC_RDWR_EXCL;
  } else {
    cdio_warn ("unknown access type: %s. Default used instead.", 
	       psz_access_mode);
    return default_access_mode;
  }
}

static discmode_t
get_discmode_win32(void *p_user_data) 
{
  _img_private_t *p_env = p_user_data;

  if (p_env->hASPI) {
    return get_discmode_aspi (p_env);
  } else {
    return get_discmode_win32ioctl (p_env);
  }
}

static const char *
is_cdrom_win32(const char drive_letter) {
  if ( WIN_NT ) {
    return is_cdrom_win32ioctl (drive_letter);
  } else {
    return is_cdrom_aspi(drive_letter);
  }
}

/*!
  Run a SCSI MMC command. 
 
  env	        private CD structure 
  i_timeout_ms  time in milliseconds we will wait for the command
                to complete. If this value is -1, use the default 
		time-out value.
  p_buf	        Buffer for data, both sending and receiving
  i_buf	        Size of buffer
  e_direction	direction the transfer is to go.
  cdb	        CDB bytes. All values that are needed should be set on 
                input. We'll figure out what the right CDB length should be.

  Return 0 if command completed successfully.
 */
static int
run_mmc_cmd_win32( void *p_user_data, unsigned int i_timeout_ms,
		   unsigned int i_cdb, const mmc_cdb_t *p_cdb, 
		   cdio_mmc_direction_t e_direction, 
		   unsigned int i_buf, /*in/out*/ void *p_buf )
{
  _img_private_t *p_env = p_user_data;

  if (p_env->hASPI) {
    return run_mmc_cmd_aspi( p_env, i_timeout_ms, i_cdb, p_cdb,  
			     e_direction, i_buf, p_buf );
  } else {
    return run_mmc_cmd_win32ioctl( p_env, i_timeout_ms, i_cdb, p_cdb,  
				   e_direction, i_buf, p_buf );
  }
}

/*!
  Initialize CD device.
 */
static bool
init_win32 (void *p_user_data)
{
  _img_private_t *p_env = p_user_data;
  bool b_ret;
  if (p_env->gen.init) {
    cdio_error ("init called more than once");
    return false;
  }
  
  p_env->gen.init           = true;
  p_env->gen.toc_init       = false;
  p_env->gen.b_cdtext_error = false;
  p_env->gen.fd             = open (p_env->gen.source_name, O_RDONLY, 0);

  /* Initializations */
  p_env->h_device_handle = NULL;
  p_env->i_sid           = 0;
  p_env->hASPI           = 0;
  p_env->lpSendCommand   = 0;
  p_env->b_aspi_init     = false;
  p_env->b_ioctl_init    = false;


  switch (p_env->access_mode) {
  case _AM_IOCTL:
  case _AM_MMC_RDWR:
  case _AM_MMC_RDWR_EXCL:
    b_ret = init_win32ioctl(p_env);
    break;
  case _AM_ASPI:
    b_ret = init_aspi(p_env);
    break;
  default:
    return 0;
  }

  /* It looks like get_media_changed_mmc will always
     return 1 (media changed) on the first call. So 
     we call it here to clear that flag. We may have
     to rethink this if there's a problem doing this
     extra work down the line. */
  get_media_changed_mmc(p_user_data);
  return b_ret;
}

/*!
  Release and free resources associated with cd. 
 */
static void
free_win32 (void *p_user_data)
{
  _img_private_t *p_env = p_user_data;

  if (NULL == p_env) return;
  if (p_env->gen.fd >= 0) close(p_env->gen.fd);

  free (p_env->gen.source_name);

  if( p_env->h_device_handle )
    CloseHandle( p_env->h_device_handle );
  if( p_env->hASPI )
    FreeLibrary( p_env->hASPI );

  free (p_env);
}

/*!
   Reads an audio device into data starting from lsn.
   Returns 0 if no error. 
 */
static int
read_audio_sectors (void *p_user_data, void *p_buf, lsn_t i_lsn, 
		    unsigned int i_blocks) 
{
  _img_private_t *p_env = p_user_data;
  if ( p_env->hASPI ) {
    return read_audio_sectors_aspi( p_env, p_buf, i_lsn, i_blocks );
  } else {
#if 0
    return read_audio_sectors_win32ioctl( p_env, p_buf, i_lsn, i_blocks );
#else
    return mmc_read_sectors( p_env->gen.cdio, p_buf, i_lsn,
                                  CDIO_MMC_READ_TYPE_CDDA, i_blocks);
#endif
  }
}

/*!
   Reads an audio device into data starting from lsn.
   Returns 0 if no error. 
 */
static driver_return_code_t
read_data_sectors_win32 (void *p_user_data, void *p_buf, lsn_t i_lsn, 
			 uint16_t i_blocksize, uint32_t i_blocks) 
{
  driver_return_code_t rc =
    read_data_sectors_mmc(p_user_data, p_buf, i_lsn, i_blocksize, i_blocks);
  if ( DRIVER_OP_SUCCESS != rc  ) {
    /* Try using generic "cooked" mode. */
    return read_data_sectors_generic( p_user_data, p_buf, i_lsn, 
				      i_blocksize, i_blocks );
  } 
  return DRIVER_OP_SUCCESS;
}

/*!
   Reads a single mode1 sector from cd device into data starting from
   lsn. Returns 0 if no error.
 */
static int
read_mode1_sector_win32 (void *p_user_data, void *p_buf, lsn_t lsn, 
			 bool b_form2)
{
  _img_private_t *p_env = p_user_data;

  if (p_env->gen.ioctls_debugged == 75)
    cdio_debug ("only displaying every 75th ioctl from now on");

  if (p_env->gen.ioctls_debugged == 30 * 75)
    cdio_debug ("only displaying every 30*75th ioctl from now on");
  
  if (p_env->gen.ioctls_debugged < 75 
      || (p_env->gen.ioctls_debugged < (30 * 75)  
	  && p_env->gen.ioctls_debugged % 75 == 0)
      || p_env->gen.ioctls_debugged % (30 * 75) == 0)
    cdio_debug ("reading %lu", (unsigned long int) lsn);
  
  p_env->gen.ioctls_debugged++;

  if ( p_env->hASPI ) {
    return read_mode1_sector_aspi( p_env, p_buf, lsn, b_form2 );
  } else {
    return read_mode1_sector_win32ioctl( p_env, p_buf, lsn, b_form2 );
  }
}

/*!
   Reads nblocks of mode1 sectors from cd device into data starting
   from lsn.
   Returns 0 if no error. 
 */
static int
read_mode1_sectors_win32 (void *p_user_data, void *p_buf, lsn_t lsn, 
			  bool b_form2, unsigned int nblocks)
{
  _img_private_t *p_env = p_user_data;
  int i;
  int retval;

  for (i = 0; i < nblocks; i++) {
    if (b_form2) {
      retval = read_mode1_sector_win32 (p_env, ((char *)p_buf) + 
					(M2RAW_SECTOR_SIZE * i),
					lsn + i, true);
      if ( retval ) return retval;
    } else {
      char buf[M2RAW_SECTOR_SIZE] = { 0, };
      if ( (retval = read_mode1_sector_win32 (p_env, buf, lsn + i, false)) )
	return retval;
      
      memcpy (((char *)p_buf) + (CDIO_CD_FRAMESIZE * i), 
	      buf, CDIO_CD_FRAMESIZE);
    }
  }
  return 0;
}

/*!
   Reads a single mode2 sector from cd device into data starting
   from lsn. Returns 0 if no error. 
 */
static int
read_mode2_sector_win32 (void *p_user_data, void *data, lsn_t lsn, 
			 bool b_form2)
{
  char buf[CDIO_CD_FRAMESIZE_RAW] = { 0, };
  _img_private_t *p_env = p_user_data;

  if (p_env->gen.ioctls_debugged == 75)
    cdio_debug ("only displaying every 75th ioctl from now on");

  if (p_env->gen.ioctls_debugged == 30 * 75)
    cdio_debug ("only displaying every 30*75th ioctl from now on");
  
  if (p_env->gen.ioctls_debugged < 75 
      || (p_env->gen.ioctls_debugged < (30 * 75)  
	  && p_env->gen.ioctls_debugged % 75 == 0)
      || p_env->gen.ioctls_debugged % (30 * 75) == 0)
    cdio_debug ("reading %lu", (unsigned long int) lsn);
  
  p_env->gen.ioctls_debugged++;

  if ( p_env->hASPI ) {
    int ret;
    ret = read_mode2_sector_aspi(p_user_data, buf, lsn, 1);
    if( ret != 0 ) return ret;
    if (b_form2)
      memcpy (data, buf, M2RAW_SECTOR_SIZE);
    else
      memcpy (((char *)data), buf + CDIO_CD_SUBHEADER_SIZE, CDIO_CD_FRAMESIZE);
    return 0;
  } else {
    return read_mode2_sector_win32ioctl( p_env, data, lsn, b_form2 );
  }
}

/*!
   Reads nblocks of mode2 sectors from cd device into data starting
   from lsn.
   Returns 0 if no error. 
 */
static int
read_mode2_sectors_win32 (void *p_user_data, void *data, lsn_t lsn, 
			  bool b_form2, unsigned int i_blocks)
{
  int i;
  int retval;
  unsigned int blocksize = b_form2 ? M2RAW_SECTOR_SIZE : CDIO_CD_FRAMESIZE;

  for (i = 0; i < i_blocks; i++) {
    if ( (retval = read_mode2_sector_win32 (p_user_data, 
					    ((char *)data) + (blocksize * i),
					    lsn + i, b_form2)) )
      return retval;
  }
  return 0;
}

/*!
   Return the size of the CD in logical block address (LBA) units.
 */
static lsn_t
get_disc_last_lsn_win32 (void *p_user_data)
{
  _img_private_t *p_env = p_user_data;

  return p_env->tocent[p_env->gen.i_tracks].start_lsn;
}

/*!
  Set the key "arg" to "value" in source device.
*/
static int
set_arg_win32 (void *p_user_data, const char key[], const char value[])
{
  _img_private_t *p_env = p_user_data;

  if (!strcmp (key, "source"))
    {
      if (!value)
	return -2;

      free (p_env->gen.source_name);
      
      p_env->gen.source_name = strdup (value);
    }
  else if (!strcmp (key, "access-mode"))
    {
      p_env->access_mode = str_to_access_mode_win32(value);
      if (p_env->access_mode == _AM_ASPI && !p_env->b_aspi_init) 
	return init_aspi(p_env) ? 1 : -3;
      else if (p_env->access_mode == _AM_IOCTL && !p_env->b_ioctl_init) 
	return init_win32ioctl(p_env) ? 1 : -3;
      else
	return -4;
      return 0;
    }
  else 
    return -1;

  return 0;
}

/*! 
  Read and cache the CD's Track Table of Contents and track info.
  Return true if successful or false if an error.
*/
static bool
read_toc_win32 (void *p_user_data) 
{
  _img_private_t *p_env = p_user_data;
  bool ret;
  if( p_env->hASPI ) {
    ret = read_toc_aspi( p_env );
  } else {
    ret = read_toc_win32ioctl( p_env );
  }
  if (ret) p_env->gen.toc_init = true ;
  return ret;
}

/*!
  Close media tray.
 */
static driver_return_code_t
open_close_media_win32 (const char *psz_win32_drive, DWORD command_flags) 
{
#ifdef _XBOX
  return DRIVER_OP_UNSUPPORTED;
#else
  MCI_OPEN_PARMS op;
  DWORD i_flags;
  int ret;
    
  memset( &op, 0, sizeof(MCI_OPEN_PARMS) );
  op.lpstrDeviceType = (LPCSTR)MCI_DEVTYPE_CD_AUDIO;
  op.lpstrElementName = psz_win32_drive;
  
  /* Set the flags for the device type */
  i_flags = MCI_OPEN_TYPE | MCI_OPEN_TYPE_ID |
    MCI_OPEN_ELEMENT | MCI_OPEN_SHAREABLE;
  
  if( _cdio_mciSendCommand( 0, MCI_OPEN, i_flags, &op ) ) {
    /* Eject disc */
    ret = _cdio_mciSendCommand( op.wDeviceID, MCI_SET, command_flags, 0 ) == 0;
    /* Release access to the device */
    _cdio_mciSendCommand( op.wDeviceID, MCI_CLOSE, MCI_WAIT, 0 );
  } else 
    ret = DRIVER_OP_ERROR;
  
  return ret;
#endif
}

/*!
  Eject media.
 */
static driver_return_code_t
eject_media_win32 (void *p_user_data) 
{
  const _img_private_t *p_env = p_user_data;
  char psz_drive[4];
  unsigned int i_device = strlen(p_env->gen.source_name);
    
  strcpy( psz_drive, "X:" );
  if (6 == i_device) {
    psz_drive[0] = p_env->gen.source_name[4];
  } else if (2 == i_device) {
    psz_drive[0] = p_env->gen.source_name[0];
  } else {
    cdio_info ("Can't pick out drive letter from device %s", 
	       p_env->gen.source_name);
    return DRIVER_OP_ERROR;
  }
  
  return open_close_media_win32(psz_drive, MCI_SET_DOOR_OPEN);
}

static bool
is_mmc_supported(void *user_data)
{
    _img_private_t *env = user_data;
    switch (env->access_mode) {
      case _AM_NONE:
	return false;
      case _AM_IOCTL:
      case _AM_ASPI:
      case _AM_MMC_RDWR:
      case _AM_MMC_RDWR_EXCL:
	return true;
    }
    /* Not reached. */
    return false;
}

/*!
  Return the value associated with the key "arg".
*/
static const char *
get_arg_win32 (void *p_user_data, const char key[])
{
  _img_private_t *p_env = p_user_data;

  if (!strcmp (key, "source")) {
    return p_env->gen.source_name;
  } else if (!strcmp (key, "access-mode")) {
    switch (p_env->access_mode) {
    case _AM_IOCTL:
      return "ioctl";
    case _AM_ASPI:
      return "ASPI";
    case _AM_MMC_RDWR:
      return "MMC_RDWR";
    case _AM_MMC_RDWR_EXCL:
      return "MMC_RDWR_EXCL";
    case _AM_NONE:
      return "no access method";
    }
  } else if (!strcmp (key, "scsi-tuple")) {
    return p_env->gen.scsi_tuple;
  } else if (!strcmp (key, "mmc-supported?")) {
      return is_mmc_supported(p_user_data) ? "true" : "false";
  }
  return NULL;
}

/*!
  Return the media catalog number MCN.

  Note: string is malloc'd so caller should free() then returned
  string when done with it.

 */
static char *
_cdio_get_mcn (const void *p_user_data) {
  const _img_private_t *p_env = p_user_data;

  if( p_env->hASPI ) {
    return mmc_get_mcn( p_env->gen.cdio );
  } else {
    return get_mcn_win32ioctl(p_env);
  }
}

/*!  
  Get format of track. 
*/
static track_format_t
_cdio_get_track_format(void *p_obj, track_t i_track) 
{
  _img_private_t *p_env = p_obj;
  
  if ( !p_env ) return TRACK_FORMAT_ERROR;
  
  if (!p_env->gen.toc_init) 
    if (!read_toc_win32 (p_env)) return TRACK_FORMAT_ERROR;

  if ( i_track < p_env->gen.i_first_track
       || i_track >= p_env->gen.i_tracks + p_env->gen.i_first_track )
    return TRACK_FORMAT_ERROR;

  if( p_env->hASPI ) {
    return get_track_format_aspi(p_env, i_track);
  } else {
    return get_track_format_win32ioctl(p_env, i_track);
  }
}

/*!
  Return true if we have XA data (green, mode2 form1) or
  XA data (green, mode2 form2). That is track begins:
  sync - header - subheader
  12     4      -  8

  FIXME: there's gotta be a better design for this and get_track_format?
*/
static bool
_cdio_get_track_green(void *p_obj, track_t i_track) 
{
  _img_private_t *p_env = p_obj;
  
  switch (_cdio_get_track_format(p_env, i_track)) {
  case TRACK_FORMAT_XA:
    return true;
  case TRACK_FORMAT_ERROR:
  case TRACK_FORMAT_CDI:
  case TRACK_FORMAT_AUDIO:
    return false;
  case TRACK_FORMAT_DATA:
    if (_AM_ASPI == p_env->access_mode ) 
      return ((p_env->tocent[i_track-p_env->gen.i_first_track].Control & 8) != 0);
  default:
    break;
  }

  /* FIXME: Dunno if this is the right way, but it's what 
     I was using in cd-info for a while.
   */
  return ((p_env->tocent[i_track-p_env->gen.i_first_track].Control & 2) != 0);
}

/*!  
  Return the starting MSF (minutes/secs/frames) for track number
  i_tracks in obj.  Track numbers start at 1.
  The "leadout" track is specified either by
  using i_tracks LEADOUT_TRACK or the total tracks+1.
  False is returned if there is no track entry.
*/
static bool
_cdio_get_track_msf(void *p_user_data, track_t i_tracks, msf_t *p_msf)
{
  _img_private_t *p_env = p_user_data;

  if (!p_msf) return false;

  if (!p_env->gen.toc_init) 
    if (!read_toc_win32 (p_env)) return false;

  if (i_tracks == CDIO_CDROM_LEADOUT_TRACK) i_tracks = p_env->gen.i_tracks+1;

  if (i_tracks > p_env->gen.i_tracks+1 || i_tracks == 0) {
    return false;
  } else {
    cdio_lsn_to_msf(p_env->tocent[i_tracks-1].start_lsn, p_msf);
    return true;
  }
}

#endif /* HAVE_WIN32_CDROM */

/*!
  Return an array of strings giving possible CD devices.
 */
char **
cdio_get_devices_win32 (void)
{
#ifndef HAVE_WIN32_CDROM
  return NULL;
#else
  char **drives = NULL;
  unsigned int num_drives=0;
  char drive_letter;
  
  /* Scan the system for CD-ROM drives.
  */

#if FINISHED
  /* Now check the currently mounted CD drives */
  if (NULL != (ret_drive = cdio_check_mounts("/etc/mtab"))) {
    cdio_add_device_list(&drives, drive, &num_drives);
  }
  
  /* Finally check possible mountable drives in /etc/fstab */
  if (NULL != (ret_drive = cdio_check_mounts("/etc/fstab"))) {
    cdio_add_device_list(&drives, drive, &num_drives);
  }
#endif

  /* Scan the system for CD-ROM drives.
     Not always 100% reliable, so use the USE_MNTENT code above first.
  */
  for (drive_letter='A'; drive_letter <= 'Z'; drive_letter++) {
    const char *drive_str=is_cdrom_win32(drive_letter);
    if (drive_str != NULL) {
      cdio_add_device_list(&drives, drive_str, &num_drives);
    }
  }
  cdio_add_device_list(&drives, NULL, &num_drives);
  return drives;
#endif /*HAVE_WIN32_CDROM*/
}

/*!
  Return a string containing the default CD device if none is specified.
  if CdIo is NULL (we haven't initialized a specific device driver), 
  then find a suitable one and return the default device for that.
  
  NULL is returned if we couldn't get a default device.
*/
char *
cdio_get_default_device_win32(void)
{

#ifdef HAVE_WIN32_CDROM
  char drive_letter;

  for (drive_letter='A'; drive_letter <= 'Z'; drive_letter++) {
    const char *drive_str=is_cdrom_win32(drive_letter);
    if (drive_str != NULL) {
      return strdup(drive_str);
    }
  }
#endif
  return NULL;
}

/*!  
  Return true if source_name could be a device containing a CD-ROM and
  we are on a MS Windows platform.
*/
bool
cdio_is_device_win32(const char *source_name)
{
#ifdef HAVE_WIN32_CDROM
  unsigned int len;

  if (NULL == source_name) return false;
  len = strlen(source_name);

  if ((len == 2) && isalpha(source_name[0]) 
	    && (source_name[len-1] == ':'))
    return true;

  if ( ! WIN_NT ) return false;

  /* Test to see if of form: \\.\x: */
  return ( (len == 6) 
	   && source_name[0] == '\\' && source_name[1] == '\\'
	   && source_name[2] == '.'  && source_name[3] == '\\'
	   && isalpha(source_name[len-2])
	   && (source_name[len-1] == ':') );
#else 
  return false;
#endif
}

driver_return_code_t
close_tray_win32 (const char *psz_win32_drive)
{
#ifdef HAVE_WIN32_CDROM
#if 1
  return open_close_media_win32(psz_win32_drive, MCI_SET_DOOR_CLOSED|MCI_WAIT);
#else 
  if ( WIN_NT ) {
    return close_tray_win32ioctl (psz_win32_drive);
  } else {
    return DRIVER_OP_UNSUPPORTED; /* not yet, but soon I hope */
  }
#endif
#else
  return DRIVER_OP_UNSUPPORTED;
#endif /* HAVE_WIN32_CDROM*/
}

/*!
  Initialization routine. This is the only thing that doesn't
  get called via a function pointer. In fact *we* are the
  ones to set that up.
 */
CdIo_t *
cdio_open_win32 (const char *psz_source_name)
{
#ifdef HAVE_WIN32_CDROM
  if ( WIN_NT ) {
    return cdio_open_am_win32(psz_source_name, "ioctl");
  } else {
    return cdio_open_am_win32(psz_source_name, "ASPI");
  }
#else 
  return NULL;
#endif /* HAVE_WIN32_CDROM */
}

/*!
  Initialization routine. This is the only thing that doesn't
  get called via a function pointer. In fact *we* are the
  ones to set that up.
 */
CdIo_t *
cdio_open_am_win32 (const char *psz_orig_source, const char *psz_access_mode)
{

#ifdef HAVE_WIN32_CDROM
  CdIo_t *ret;
  _img_private_t *_data;
  char *psz_source;

  cdio_funcs_t _funcs;

  memset( &_funcs, 0, sizeof(_funcs) );

  _funcs.audio_get_volume       = audio_get_volume_win32;
  _funcs.audio_pause            = audio_pause_win32;
  _funcs.audio_play_msf         = audio_play_msf_win32;
#if 0
  _funcs.audio_play_track_index = audio_play_track_index_win32;
#endif
  _funcs.audio_read_subchannel  = audio_read_subchannel_win32;
  _funcs.audio_resume           = audio_resume_win32;
  _funcs.audio_set_volume       = audio_set_volume_win32;
  _funcs.audio_stop             = audio_stop_win32;
  _funcs.eject_media            = eject_media_win32;
  _funcs.free                   = free_win32;
  _funcs.get_arg                = get_arg_win32;
  _funcs.get_cdtext             = get_cdtext_generic;
  _funcs.get_cdtext_raw         = read_cdtext_generic;
  _funcs.get_default_device     = cdio_get_default_device_win32;
  _funcs.get_devices            = cdio_get_devices_win32;
  _funcs.get_disc_last_lsn      = get_disc_last_lsn_win32;
  _funcs.get_discmode           = get_discmode_win32;
  _funcs.get_drive_cap          = get_drive_cap_mmc;
  _funcs.get_first_track_num    = get_first_track_num_generic;
  _funcs.get_hwinfo             = NULL;
  _funcs.get_media_changed      = get_media_changed_mmc;
  _funcs.get_mcn                = _cdio_get_mcn;
  _funcs.get_num_tracks         = get_num_tracks_generic;
  _funcs.get_track_channels     = get_track_channels_generic,
  _funcs.get_track_copy_permit  = get_track_copy_permit_generic,
  _funcs.get_track_format       = _cdio_get_track_format;
  _funcs.get_track_green        = _cdio_get_track_green;
  _funcs.get_track_lba          = NULL; /* This could be done if need be. */
  _funcs.get_track_msf          = _cdio_get_track_msf;
  _funcs.get_track_preemphasis  = get_track_preemphasis_generic,
  _funcs.lseek                  = NULL;
  _funcs.read                   = NULL;
  _funcs.read_audio_sectors     = read_audio_sectors;
  _funcs.read_data_sectors      = read_data_sectors_win32;
  _funcs.read_mode1_sector      = read_mode1_sector_win32;
  _funcs.read_mode1_sectors     = read_mode1_sectors_win32;
  _funcs.read_mode2_sector      = read_mode2_sector_win32;
  _funcs.read_mode2_sectors     = read_mode2_sectors_win32;
  _funcs.read_toc               = read_toc_win32;
  _funcs.run_mmc_cmd            = run_mmc_cmd_win32;
  _funcs.set_arg                = set_arg_win32;
  _funcs.set_blocksize          = set_blocksize_mmc;
  _funcs.set_speed              = set_drive_speed_mmc;

  _data                 = calloc(1, sizeof (_img_private_t));
  _data->access_mode    = str_to_access_mode_win32(psz_access_mode);
  _data->gen.init       = false;
  _data->gen.fd         = -1;

  if (NULL == psz_orig_source) {
    psz_source=cdio_get_default_device_win32();
    if (NULL == psz_source) return NULL;
    set_arg_win32(_data, "source", psz_source);
    free(psz_source);
  } else {
    if (cdio_is_device_win32(psz_orig_source))
      set_arg_win32(_data, "source", psz_orig_source);
    else {
      /* The below would be okay as an info message if all device
	 drivers worked this way. */
      cdio_debug ("source %s is a not a device", psz_orig_source);
      free(_data);
      return NULL;
    }
  }

  ret = cdio_new ((void *)_data, &_funcs);
  if (ret == NULL) return NULL;

  if (init_win32(_data))
    return ret;
  else {
    free_win32 (_data);
    return NULL;
  }
  
#else 
  return NULL;
#endif /* HAVE_WIN32_CDROM */

}

bool
cdio_have_win32 (void)
{
#ifdef HAVE_WIN32_CDROM
  return true;
#else 
  return false;
#endif /* HAVE_WIN32_CDROM */
}