/* * (C) Copyright 2002 * Stäubli Faverges - * 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 #include #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)\n", 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\n"); 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\n", boot -> jump [0], boot -> jump [1], boot -> jump[2]); PRINTF ("OEM name & version '%*.*s'\n", BANNER_LG, BANNER_LG, boot -> banner ); PRINTF ("Bytes per sector hopefully 512 %d\n", __le16_to_cpu (boot -> secsiz)); PRINTF ("Cluster size in sectors %d\n", boot -> clsiz); PRINTF ("Number of reserved (boot) sectors %d\n", __le16_to_cpu (boot -> nrsvsect)); PRINTF ("Number of FAT tables hopefully 2 %d\n", boot -> nfat); PRINTF ("Number of directory slots %d\n", __le16_to_cpu (boot -> dirents)); PRINTF ("Total sectors on disk %d\n", __le16_to_cpu (boot -> psect)); PRINTF ("Media descriptor=first byte of FAT %d\n", boot -> descr); PRINTF ("Sectors in FAT %d\n", __le16_to_cpu (boot -> fatlen)); PRINTF ("Sectors/track %d\n", __le16_to_cpu (boot -> nsect)); PRINTF ("Heads %d\n", __le16_to_cpu (boot -> nheads)); PRINTF ("number of hidden sectors %d\n", __le32_to_cpu (boot -> nhs)); PRINTF ("big total sectors %d\n", __le32_to_cpu (boot -> bigsect)); PRINTF ("physical drive ? %d\n", boot -> physdrive); PRINTF ("reserved %d\n", boot -> reserved); PRINTF ("dos > 4.0 diskette %d\n", boot -> dos4); PRINTF ("serial number %d\n", __le32_to_cpu (boot -> serial)); PRINTF ("disk label %*.*s\n", LABEL_LG, LABEL_LG, boot -> label); PRINTF ("FAT type %8.8s\n", boot -> fat_type); PRINTF ("reserved by 2M %d\n", boot -> res_2m); PRINTF ("2M checksum (not used) %d\n", boot -> CheckSum); PRINTF ("2MF format version %d\n", boot -> fmt_2mf); PRINTF ("1 if write track after format %d\n", boot -> wt); PRINTF ("data transfer rate on track 0 %d\n", boot -> rate_0); PRINTF ("data transfer rate on track<>0 %d\n", boot -> rate_any); PRINTF ("offset to boot program %d\n", __le16_to_cpu (boot -> BootP)); PRINTF ("T1: information for track 0 %d\n", __le16_to_cpu (boot -> Infp0)); PRINTF ("T2: information for track<>0 %d\n", __le16_to_cpu (boot -> InfpX)); PRINTF ("T3: track sectors size table %d\n", __le16_to_cpu (boot -> InfTm)); PRINTF ("Format date 0x%04x\n", __le16_to_cpu (boot -> DateF)); PRINTF ("Format time 0x%04x\n", __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); }