/*
 * $Id$
 *
 * This file is part of WorkMan, the civilized CD player library
 * (c) 1991-1997 by Steven Grimm (original author)
 * (c) by Dirk Försterling (current 'author' = maintainer)
 * The maintainer can be contacted by his e-mail address:
 * milliByte@DeathsDoor.com 
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *
 * ULTRIX 4.2 drive control routines.
 */

static char plat_ultrix_id[] = "$Id$";

#if defined(ultrix) || defined(__ultrix)


#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/statfs.h>
#include <sys/time.h>
#include <string.h>
#include <sys/rzdisk.h>
#include <sys/cdrom.h>

#include "include/wm_config.h"
#include "include/wm_cdtext.h"
#include "include/wm_struct.h"

#define WM_MSG_CLASS WM_MSG_CLASS_PLATFORM

/*
 *   This structure will be filled with the TOC header and all entries.
 * Ultrix doesn't seem to allow getting single TOC entries.
 *                              - Chris Ross (cross@eng.umd.edu)
 */
struct cd_toc_header_and_entries 
{
  struct cd_toc_header	cdth;
  struct cd_toc_entry		cdte[CDROM_MAX_TRACK+1];
};

void *malloc();
char *strchr();

int	min_volume = 128;
int	max_volume = 255;

char * ultrix_cd_device = NULL;
/*
 * fgetline()
 *
 *   Simulate fgets, but joining continued lines in the output of uerf.
 */

#define BUF_SIZE        85              /* Max length of a (real) line */

char *
fgetline( FILE *fp )
{
  static char     *retval = NULL;
  static char     holdbuf[BUF_SIZE + 1];
  char            tmp[BUF_SIZE + 1];
  char            *stmp;
  
  if (!retval) 
    {
      retval = malloc(BUF_SIZE * 3);  /* 3 lines can be joined */
      if (!retval)
	return(NULL);
      else
	*retval = '\0';
    }
  
  if (*holdbuf) 
    {
      strcpy(retval, holdbuf);
      retval[strlen(retval)-1] = '\0';
      memset(holdbuf, 0, BUF_SIZE+1);
    }

  while (fgets(tmp, BUF_SIZE, fp)) 
    {
      stmp = tmp + strspn(tmp, " \t");
      if (*stmp == '_') 
	{                     /* Continuation line */
	  retval[strlen(retval)-1] = '\0';   /* Trim off C/R */
	  strcat(retval, stmp+1);
	} else {
	  if (*retval) 
	    {
	      strcpy(holdbuf, tmp);
	      holdbuf[strlen(holdbuf)-1] = -1;
	      return retval;
	    } else {             /* First line read, keep reading */
	      strcat(retval, stmp);
	      retval[strlen(retval)-1] = '\0';
	    }
	}
    }
  return NULL;
} /* fgetline() */

/*
 * find_cdrom
 *
 * Determine the name of the CD-ROM device.
 *
 * Read through the boot records (via a call to uerf) and find the SCSI
 * address of the CD-ROM.  If the "CDROM" environment variable is set,
 * use that instead.
 */
const char*
find_cdrom()
{
  char	*data;
  FILE	*uerf;
  int	fds[2];
  int	pid;
  const char* device = NULL;
  
  device = getenv("CDROM");
  
  if (device != NULL)
    {
      if(strncmp("/dev/", device, 5) || strstr(device, "/../"))
	return NULL;
    }
  
  pipe(fds);
  
  if ((pid = fork()) == 0) 
    {
      close(fds[0]);
      dup2(fds[1], 1);
      execl("/etc/uerf", "uerf", "-R", "-r", "300", (void *)0);
      execl("/usr/sbin/uerf", "uerf", "-R", "-r", "300", (void *)0);
      return NULL; /* _exit(1); */
    } else if (pid < 0) {
      perror("fork");
      return NULL; /* exit(1); */
    }
  
  close(fds[1]);
  uerf = fdopen(fds[0], "r");
  
  while (data = fgetline(uerf))
    if (strstr(data, "RRD42")) 
      {
	char	*device_p;
	
	ultrix_cd_device = (char *)malloc(sizeof("/dev/rrz##c"));
	strcpy(ultrix_cd_device, "/dev/r");
	device_p = strstr(data, "rz");
	device_p[(int)(strchr(device_p, ' ') - device_p)] = '\0';
	strcat(ultrix_cd_device, device_p);
	strcat(ultrix_cd_device, "c");
	device = ultrix_cd_device;
	break;
      }
  
  fclose(uerf);
  
  if (device == NULL) 
    {
      fprintf(stderr, "No cdrom (RRD42) is installed on this system\n");
      return NULL; /* exit(1); */
    }
  
  kill(pid, 15);
  (void)wait((int *)NULL);
  return device;
} /* find_cdrom() */

/*
 * initialize the drive.  a no-op for the generic driver.
 */
int
gen_init( struct wm_drive *d )
{
	return (0);
} /* gen_init() */


/*
 * Open the CD device and figure out what kind of drive is attached.
 */
int
wmcd_open( struct wm_drive *d )
{
  int		fd;
  static int	warned = 0;
  
  if (d->fd >= 0)		/* Device already open? */
    {
      wm_lib_message(WM_MSG_LEVEL_DEBUG|WM_MSG_CLASS, "wmcd_open(): [device is open (fd=%d)]\n", d->fd);
      return (0);
    }
  
  if (d->cd_device == NULL)
    d->cd_device = find_cdrom();
  
  d->fd = open(d->cd_device, 0);
  if (d->fd < 0)
    {
      if (errno == EACCES)
	{
          return -EACCES;
	}
      else if (errno != EINTR)
	{
          return( -6 );
	}
      
      /* No CD in drive. */
      return (1);
    }
  
  /* Now fill in the relevant parts of the wm_drive structure. */
  find_drive_struct("", "", "");
  d->fd = fd;
  
  (d->init)(d);
  
  return (0);
} /* wmcd_open() */

/*
 * Re-Open the device if it is open.
 */
int
wmcd_reopen( struct wm_drive *d )
{
  int status;
  
  do {
    wm_lib_message(WM_MSG_LEVEL_DEBUG|WM_MSG_CLASS, "wmcd_reopen\n");
    status = gen_close( d );
    wm_susleep( 1000 );
    wm_lib_message(WM_MSG_LEVEL_DEBUG|WM_MSG_CLASS, "calling wmcd_open()\n");
    status = wmcd_open( d ); /* open it as usual */
    wm_susleep( 1000 );
  } while ( status != 0 );
  return status;
} /* wmcd_reopen() */

/*
 * Send an arbitrary SCSI command to a device.
 */
int
wm_scsi( struct wm_drive *d, unsigned char *cdb, int cdblen, 
	 void *retbuf, int retbuflen, int getreply )
{
	/* ULTRIX doesn't have a SCSI passthrough interface, does it? */
	return (-1);
} /* wm_scsi() */

int
gen_close( struct wm_drive *d )
{
  if(d->fd != -1) {
    wm_lib_message(WM_MSG_LEVEL_DEBUG|WM_MSG_CLASS, "closing the device\n");
    close(d->fd);
    d->fd = -1;
  }
  return 0;
}

/*
 * Get the current status of the drive: the current play mode, the absolute
 * position from start of disc (in frames), and the current track and index
 * numbers if the CD is playing or paused.
 */
int
gen_get_drive_status( struct wm_drive *d, int oldmode, 
		      int *mode, int *pos, int *track, int *index)
{
  struct cd_sub_channel		sc;
  struct cd_subc_channel_data	scd;
  
  /* If we can't get status, the CD is ejected, so default to that. */
  *mode = WM_CDM_EJECTED;
  
  sc.sch_address_format	= CDROM_MSF_FORMAT;
  sc.sch_data_format	= CDROM_CURRENT_POSITION;
  sc.sch_track_number	= 0;
  sc.sch_alloc_length	= sizeof(scd);
  sc.sch_buffer		= (caddr_t)&scd;
  
  /* Is the device open? */
  if (d->fd < 0)
    {
      switch (wmcd_open(d)) 
	{
	case -1:	/* error */
	  return (-1);
	  
	case 1:		/* retry */
	  return (0);
	}
    }
  
  if (ioctl(d->fd, CDROM_READ_SUBCHANNEL, &sc))
    return (0);	/* ejected */
  
  switch (scd.scd_header.sh_audio_status) 
    {
    case AS_PLAY_IN_PROGRESS:
      *mode = WM_CDM_PLAYING;
dopos:
      *pos = scd.scd_position_data.scp_absaddr.msf.m_units * 60 * 75 +
	scd.scd_position_data.scp_absaddr.msf.s_units * 75 +
	scd.scd_position_data.scp_absaddr.msf.f_units;
      *track = scd.scd_position_data.scp_track_number;
      *index = scd.scd_position_data.scp_index_number;
      break;
      
    case AS_PLAY_PAUSED:
      if (oldmode == WM_CDM_PLAYING || oldmode == WM_CDM_PAUSED)
	{
	  *mode = WM_CDM_PAUSED;
	  goto dopos;
	}
      else
	*mode = WM_CDM_STOPPED;
      break;
      
    case AS_PLAY_COMPLETED:
      *mode = WM_CDM_TRACK_DONE; /* waiting for next track. */
      break;
      
    case AS_NO_STATUS:
      *mode = WM_CDM_STOPPED;
      break;
    }
  return (0);
} /* gen_get_drive_status() */

/*
 * Get the number of tracks on the CD.
 */
int
gen_get_trackcount( struct wm_drive *d, int *tracks )
{
  struct cd_toc_header	hdr;
  
  if (ioctl(d->fd, CDROM_TOC_HEADER, &hdr))
    return (-1);
  
  *tracks = hdr.th_ending_track;
  
  return (0);
} /* gen_get_trackcount() */

/*
 * Get the start time and mode (data or audio) of a track.
 *
 * XXX - this should get cached, but that means keeping track of ejects.
 */
int
gen_get_trackinfo(struct wm_drive *d, int track, int *data, int *startframe)
{
  struct cd_toc				toc;
  struct cd_toc_header			hdr;
  struct cd_toc_header_and_entries	toc_buffer;
  
  if (ioctl(d->fd, CDROM_TOC_HEADER, &hdr))
    return (-1);
  
  bzero((char *)&toc_buffer, sizeof(toc_buffer));
  toc.toc_address_format = CDROM_MSF_FORMAT;
  toc.toc_starting_track = 0;
  toc.toc_alloc_length = (u_short)(((hdr.th_data_len1 << 8) +
				    hdr.th_data_len0) & 0xfff) + 2;
  toc.toc_buffer = (caddr_t)&toc_buffer;
  
  if (ioctl(d->fd, CDROM_TOC_ENTRYS, &toc))
    return (-1);
  
  if (track == 0)
    track = hdr.th_ending_track + 1;
  
  *data = (toc_buffer.cdte[track-1].te_control & CDROM_DATA_TRACK) ? 1:0;
  *startframe = toc_buffer.cdte[track - 1].te_absaddr.msf.m_units*60*75 +
    toc_buffer.cdte[track - 1].te_absaddr.msf.s_units * 75 +
    toc_buffer.cdte[track - 1].te_absaddr.msf.f_units;
  
  return (0);
} /* gen_get_trackinfo() */

/*
 * Get the number of frames on the CD.
 */
int
gen_get_cdlen(struct wm_drive *d, int *frames)
{
  int		tmp;
  return (gen_get_trackinfo(d, 0, &tmp, frames));
} /* gen_get_cdlen() */

/*
 * Play the CD from one position to another (both in frames.)
 */
int
gen_play( struct wm_drive *d, int start, int end )
{
  struct cd_play_audio_msf	msf;
  
  msf.msf_starting_M_unit	= start / (60*75);
  msf.msf_starting_S_unit	= (start % (60*75)) / 75;
  msf.msf_starting_F_unit	= start % 75;
  msf.msf_ending_M_unit	= end / (60*75);
  msf.msf_ending_S_unit	= (end % (60*75)) / 75;
  msf.msf_ending_F_unit	= end % 75;
  
  if (ioctl(d->fd, SCSI_START_UNIT))
    return (-1);
  if (ioctl(d->fd, CDROM_PLAY_MSF, &msf))
    return (-2);
  
  return (0);
} /* gen_play() */

/*
 * Pause the CD.
 */
int
gen_pause( struct wm_drive *d )
{
  return (ioctl(d->fd, CDROM_PAUSE_PLAY));
} /* gen_pause() */

/*
 * Resume playing the CD (assuming it was paused.)
 */
int
gen_resume( struct wm_drive *d )
{
  return (ioctl(d->fd, CDROM_RESUME_PLAY));
} /* gen_resume() */

/*
 * Stop the CD.
 */
int
gen_stop( struct wm_drive *d )
{
  return (ioctl(d->fd, SCSI_STOP_UNIT));
} /* gen_stop() */

/*
 * Eject the current CD, if there is one.
 */
int
gen_eject(struct wm_drive *d)
{
  /* On some systems, we can check to see if the CD is mounted. */
  struct stat	stbuf;
  struct statfs	sfsbuf;
  
  if (fstat(d->fd, &stbuf) != 0)
    return (-2);
  
  /* Is this a mounted filesystem? */
  if (fstatfs(d->fd, &sfsbuf) == 0)
    return (-3);
  
  return (ioctl(d->fd, CDROM_EJECT_CADDY));
} /* gen_eject() */

/*----------------------------------------*
 * Close the CD tray
 *
 * Please edit and send changes to
 * milliByte@DeathsDoor.com
 *----------------------------------------*/

int 
gen_closetray(struct wm_drive *d)
{
#ifdef CAN_CLOSE
  if(!close(d->fd))
    {
      d->fd=-1;
      return(wmcd_reopen(d));
    } else {
      return(-1);
    }
#else
  /* Always succeed if the drive can't close */
  return(0);
#endif /* CAN_CLOSE */
} /* gen_closetray() */


/*
 * scale_volume(vol, max)
 *
 * Return a volume value suitable for passing to the CD-ROM drive.  "vol"
 * is a volume slider setting; "max" is the slider's maximum value.
 *
 * On Sun and DEC CD-ROM drives, the amount of sound coming out the jack
 * increases much faster toward the top end of the volume scale than it
 * does at the bottom.  To make up for this, we make the volume scale look
 * sort of logarithmic (actually an upside-down inverse square curve) so
 * that the volume value passed to the drive changes less and less as you
 * approach the maximum slider setting.  The actual formula looks like
 *
 *     (max^2 - (max - vol)^2) * (max_volume - min_volume)
 * v = --------------------------------------------------- + min_volume
 *                           max^2
 *
 * If your system's volume settings aren't broken in this way, something
 * like the following should work:
 *
 *	return ((vol * (max_volume - min_volume)) / max + min_volume);
 */
scale_volume( int vol, int max )
{
  return ((max * max - (max - vol) * (max - vol)) *
	  (max_volume - min_volume) / (max * max) + min_volume);
} /* scale_volume() */


/*
 * unscale_volume(cd_vol, max)
 *
 * Given a value between min_volume and max_volume, return the volume slider
 * value needed to achieve that value.
 *
 * Rather than perform floating-point calculations to reverse the above
 * formula, we simply do a binary search of scale_volume()'s return values.
 */
static int
unscale_volume( int cd_vol, int max )
{
  int	vol = 0, top = max, bot = 0, scaled;
  
  while (bot <= top)
    {
      vol = (top + bot) / 2;
      scaled = scale_volume(vol, max);
      if (cd_vol == scaled)
	break;
      if (cd_vol < scaled)
	top = vol - 1;
      else
	bot = vol + 1;
    }
  
  if (vol < 0)
    vol = 0;
  else if (vol > max)
    vol = max;
  
  return (vol);
} /* unscale_volume() */

/*
 * Set the volume level for the left and right channels.  Their values
 * range from 0 to 100.
 */
int
gen_set_volume( struct wm_drive *d, int left, int right )
{
  struct cd_playback		pb;
  struct cd_playback_status	ps;
  struct cd_playback_control	pc;
  
  left = scale_volume(left, 100);
  right = scale_volume(right, 100);
  
  bzero((char *)&pb, sizeof(pb));
  bzero((char *)&ps, sizeof(ps));
  bzero((char *)&pc, sizeof(pc));
  
  pb.pb_alloc_length = sizeof(ps);
  pb.pb_buffer = (caddr_t)&ps;
  
  if (ioctl(d->fd, CDROM_PLAYBACK_STATUS, &pb))
    return (-1);
  
  pc.pc_chan0_select = ps.ps_chan0_select;
  pc.pc_chan0_volume = (left < CDROM_MIN_VOLUME) ?
    CDROM_MIN_VOLUME : (left > CDROM_MAX_VOLUME) ?
    CDROM_MAX_VOLUME : left;
  pc.pc_chan1_select = ps.ps_chan1_select;
  pc.pc_chan1_volume = (right < CDROM_MIN_VOLUME) ?
    CDROM_MIN_VOLUME : (right > CDROM_MAX_VOLUME) ?
    CDROM_MAX_VOLUME : right;
  
  pb.pb_alloc_length = sizeof(pc);
  pb.pb_buffer = (caddr_t)&pc;
  
  if (ioctl(d->fd, CDROM_PLAYBACK_CONTROL, &pb))
    return (-1);
  
  return (0);
} /* gen_set_volume() */

/*
 * Read the initial volume from the drive, if available.  Each channel
 * ranges from 0 to 100, with -1 indicating data not available.
 */
int
gen_get_volume(struct wm_drive *d, int *left, int *right)
{
  struct cd_playback		pb;
  struct cd_playback_status	ps;
  
  bzero((char *)&pb, sizeof(pb));
  bzero((char *)&ps, sizeof(ps));
  
  pb.pb_alloc_length = sizeof(ps);
  pb.pb_buffer = (caddr_t)&ps;
  
  if (d->fd >= 0)
    {
      if (ioctl(d->fd, CDROM_PLAYBACK_STATUS, &pb))
	*left = *right = -1;
      else
	{
	  *left = unscale_volume(ps.ps_chan0_volume, 100);
	  *right = unscale_volume(ps.ps_chan1_volume, 100);
	}
    }
  else
    *left = *right = -1;
  
  return (0);
} /* gen_get_volume() */

/*------------------------------------------------------------------------*
 * gen_get_cdtext(drive, buffer, length)
 *------------------------------------------------------------------------*/

int
gen_get_cdtext(struct wm_drive *d, unsigned char **pp_buffer, int *p_buffer_length)
{
  return -1; /* No SCSI, no CDTEXT */
} /* gen_get_cdtext() */


#endif
