/*
   * (C) Copyright 2002

   * Stäubli Faverges - <www.staubli.com>

   * Pierre AUBERT  p.aubert@staubli.com
   *
   * See file CREDITS for list of people who contributed to this
   * project.
   *
   * 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 2 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, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
   * MA 02111-1307 USA
   */
  
  #include <common.h>
  #include <config.h>
  
  #include "dos.h"
  #include "fdos.h"

  #define NB_HEADS        2
  #define NB_TRACKS       80
  #define NB_SECTORS      18
  
  
  static int lastwhere;
  
  /*-----------------------------------------------------------------------------

   * dev_open --

   *-----------------------------------------------------------------------------
   */
  int dev_open (void)
  {
      lastwhere = 0;
      return (0);
  }
  
  /*-----------------------------------------------------------------------------
   * dev_read -- len and where are sectors number
   *-----------------------------------------------------------------------------
   */
  int dev_read (void *buffer, int where, int len)
  {
      PRINTF ("dev_read (len = %d, where = %d)
  ", len, where);
  
      /* Si on ne desire pas lire a la position courante, il faut un seek      */
      if (where != lastwhere) {

  	if (!fdc_fdos_seek (where)) {
  	    PRINTF ("seek error in dev_read");
  	    lastwhere = -1;
  	    return (-1);
  	}

      }

      if (!fdc_fdos_read (buffer, len)) {

  	PRINTF ("read error
  ");
  	lastwhere = -1;
  	return (-1);

      }
      lastwhere = where + len;
      return (0);
  }
  /*-----------------------------------------------------------------------------
   * check_dev -- verify the diskette format
   *-----------------------------------------------------------------------------
   */
  int check_dev (BootSector_t *boot, Fs_t *fs)
  {
      unsigned int heads, sectors, tracks;
      int BootP, Infp0, InfpX, InfTm;
      int sect_per_track;
  
      /* Display Boot header                                                   */
      PRINTF ("Jump to boot code                  0x%02x 0x%02x 0x%02x
  ",

  	    boot -> jump [0], boot -> jump [1], boot -> jump[2]);

      PRINTF ("OEM name & version                 '%*.*s'
  ",

  	    BANNER_LG, BANNER_LG, boot -> banner );

      PRINTF ("Bytes per sector hopefully 512     %d
  ",

  	    __le16_to_cpu (boot -> secsiz));

      PRINTF ("Cluster size in sectors            %d
  ",

  	    boot -> clsiz);

      PRINTF ("Number of reserved (boot) sectors  %d
  ",

  	    __le16_to_cpu (boot -> nrsvsect));

      PRINTF ("Number of FAT tables hopefully 2   %d
  ",

  	    boot -> nfat);

      PRINTF ("Number of directory slots          %d
  ",

  	    __le16_to_cpu (boot -> dirents));

      PRINTF ("Total sectors on disk              %d
  ",

  	    __le16_to_cpu (boot -> psect));

      PRINTF ("Media descriptor=first byte of FAT %d
  ",

  	    boot -> descr);

      PRINTF ("Sectors in FAT                     %d
  ",

  	    __le16_to_cpu (boot -> fatlen));

      PRINTF ("Sectors/track                      %d
  ",

  	    __le16_to_cpu (boot -> nsect));

      PRINTF ("Heads                              %d
  ",

  	    __le16_to_cpu (boot -> nheads));

      PRINTF ("number of hidden sectors           %d
  ",

  	    __le32_to_cpu (boot -> nhs));

      PRINTF ("big total sectors                  %d
  ",

  	    __le32_to_cpu (boot -> bigsect));

      PRINTF ("physical drive ?                   %d
  ",

  	    boot -> physdrive);

      PRINTF ("reserved                           %d
  ",

  	    boot -> reserved);

      PRINTF ("dos > 4.0 diskette                 %d
  ",

  	    boot -> dos4);

      PRINTF ("serial number                      %d
  ",

  	    __le32_to_cpu (boot -> serial));

      PRINTF ("disk label                         %*.*s
  ",

  	    LABEL_LG, LABEL_LG, boot -> label);

      PRINTF ("FAT type                           %8.8s
  ",

  	    boot -> fat_type);

      PRINTF ("reserved by 2M                     %d
  ",

  	    boot -> res_2m);

      PRINTF ("2M checksum (not used)             %d
  ",

  	    boot -> CheckSum);

      PRINTF ("2MF format version                 %d
  ",

  	    boot -> fmt_2mf);

      PRINTF ("1 if write track after format      %d
  ",

  	    boot -> wt);

      PRINTF ("data transfer rate on track 0      %d
  ",

  	    boot -> rate_0);

      PRINTF ("data transfer rate on track<>0     %d
  ",

  	    boot -> rate_any);

      PRINTF ("offset to boot program             %d
  ",

  	    __le16_to_cpu (boot -> BootP));

      PRINTF ("T1: information for track 0        %d
  ",

  	    __le16_to_cpu (boot -> Infp0));

      PRINTF ("T2: information for track<>0       %d
  ",

  	    __le16_to_cpu (boot -> InfpX));

      PRINTF ("T3: track sectors size table       %d
  ",

  	    __le16_to_cpu (boot -> InfTm));

      PRINTF ("Format date                        0x%04x
  ",

  	    __le16_to_cpu (boot -> DateF));

      PRINTF ("Format time                        0x%04x
  ",

  	    __le16_to_cpu (boot -> TimeF));

      /* information is extracted from boot sector                           */

      heads = __le16_to_cpu (boot -> nheads);
      sectors = __le16_to_cpu (boot -> nsect);
      fs -> tot_sectors = __le32_to_cpu (boot -> bigsect);
      if (__le16_to_cpu (boot -> psect) != 0) {

  	fs -> tot_sectors = __le16_to_cpu (boot -> psect);

      }

      sect_per_track = heads * sectors;
      tracks = (fs -> tot_sectors + sect_per_track - 1) / sect_per_track;

      BootP = __le16_to_cpu (boot -> BootP);
      Infp0 = __le16_to_cpu (boot -> Infp0);
      InfpX = __le16_to_cpu (boot -> InfpX);
      InfTm = __le16_to_cpu (boot -> InfTm);

      if (boot -> dos4 == EXTENDED_BOOT &&

  	strncmp( boot->banner,"2M", 2 ) == 0 &&
  	BootP < SZ_STD_SECTOR &&
  	Infp0 < SZ_STD_SECTOR &&
  	InfpX < SZ_STD_SECTOR &&
  	InfTm < SZ_STD_SECTOR &&
  	BootP >= InfTm + 2 &&
  	InfTm >= InfpX &&
  	InfpX >= Infp0 &&
  	Infp0 >= 76 ) {
  
  	return (-1);

      }
  
      if (heads != NB_HEADS ||

  	tracks != NB_TRACKS ||
  	sectors != NB_SECTORS ||
  	__le16_to_cpu (boot -> secsiz) != SZ_STD_SECTOR ||
  	fs -> tot_sectors == 0 ||
  	(fs -> tot_sectors % sectors) != 0) {
  	return (-1);

      }

      return (0);
  }