/* FIPS - the First nondestructive Interactive Partition Splitting program Module logdr_st.cpp RCS - Header: $Header: c:/daten/fips/source/main/RCS/logdr_str.cpp 1.4 1995/01/19 00:00:54 schaefer Exp schaefer $ Copyright (C) 1993 Arno Schaefer 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., 675 Mass Ave, Cambridge, MA 02139, USA. Report problems and direct all questions to: schaefer@rbg.informatik.th-darmstadt.de */ #include #include "types.h" #include "logdr_st.h" /* ----------------------------------------------------------------------- */ /* Extract Bios Parameter Block from boot sector */ /* ----------------------------------------------------------------------- */ void bios_parameter_block::get (boot_sector *boot_sector) { byte *bp = boot_sector->data; memcpy (jump_instruction,bp,3); memcpy (oem_name,bp+3,8); oem_name[8]=0; bytes_per_sector = *(bp+0xb) | (*(bp+0xc) << 8); sectors_per_cluster = *(bp+0xd); reserved_sectors = *(bp+0xe) | (*(bp+0xf) << 8); no_of_fats = *(bp+0x10); no_of_rootdir_entries = *(bp+0x11) | (*(bp+0x12) << 8); no_of_sectors = *(bp+0x13) | (*(bp+0x14) << 8); media_descriptor = *(bp+0x15); sectors_per_fat16 = *(bp+0x16) | (*(bp+0x17) << 8); sectors_per_track = *(bp+0x18) | (*(bp+0x19) << 8); drive_heads = *(bp+0x1a) | (*(bp+0x1b) << 8); hidden_sectors = (dword) *(bp+0x1c) | ((dword) *(bp+0x1d) << 8) | ((dword) *(bp+0x1e) << 16) | ((dword) *(bp+0x1f) << 24); no_of_sectors_long = (dword) *(bp+0x20) | ((dword) *(bp+0x21) << 8) | ((dword) *(bp+0x22) << 16) | ((dword) *(bp+0x23) << 24); bp += 0x24; if (sectors_per_fat16 == 0) { /* Might be a FAT32 partition */ sectors_per_fat = (dword) (((dword) bp[3] << 24) | ((dword) bp[2] << 16) | (bp[1] << 8) | bp[0]); bp += 4; flags = (bp[1] << 8) | bp[0]; bp += 2; version[0] = *bp++; version[1] = *bp++; root_cluster = (dword) (((dword) bp[3] << 24) | ((dword) bp[2] << 16) | (bp[1] << 8) | bp[0]); bp += 4; info_sector = ((bp[1] << 8) | bp[0]); bp += 2; backup_boot = ((bp[1] << 8) | bp[0]); bp += 2; bp += 12; /* Skip over reserved bytes */ } else { sectors_per_fat = sectors_per_fat16; root_cluster = 0; } phys_drive_no = *bp; bp += 2; signature = *bp++; serial_number = (dword) (bp[0] | (bp[1] << 16) | ((dword) bp[2] << 16) | ((dword) bp[3] << 24)); bp += 4; memcpy (volume_label,bp,11); bp += 11; volume_label[11] = 0; memcpy (file_system_id,bp,8); bp += 8; file_system_id[8] = 0; } /* ----------------------------------------------------------------------- */ /* Write Bios Parameter Block back into boot sector */ /* ----------------------------------------------------------------------- */ void bios_parameter_block::put (boot_sector *boot_sector) { byte *bp = boot_sector->data; memcpy (bp,jump_instruction,3); memcpy (bp+3,oem_name,8); *(bp+0xb) = bytes_per_sector & 0xff; *(bp+0xc) = (bytes_per_sector >> 8) & 0xff; *(bp+0xd) = sectors_per_cluster; *(bp+0xe) = reserved_sectors & 0xff; *(bp+0xf) = (reserved_sectors >> 8) & 0xff; *(bp+0x10) = no_of_fats; *(bp+0x11) = no_of_rootdir_entries & 0xff; *(bp+0x12) = (no_of_rootdir_entries >> 8) & 0xff; *(bp+0x13) = no_of_sectors & 0xff; *(bp+0x14) = (no_of_sectors >> 8) & 0xff; *(bp+0x15) = media_descriptor; if (sectors_per_fat16 == 0) { *(bp+0x16) = 0; *(bp+0x17) = 0; } else { *(bp+0x16) = sectors_per_fat & 0xff; *(bp+0x17) = (sectors_per_fat >> 8) & 0xff; } *(bp+0x18) = sectors_per_track & 0xff; *(bp+0x19) = (sectors_per_track >> 8) & 0xff; *(bp+0x1a) = drive_heads & 0xff; *(bp+0x1b) = (drive_heads >> 8) & 0xff; *(bp+0x1c) = hidden_sectors & 0xff; *(bp+0x1d) = (hidden_sectors >> 8) & 0xff; *(bp+0x1e) = (hidden_sectors >> 16) & 0xff; *(bp+0x1f) = (hidden_sectors >> 24) & 0xff; *(bp+0x20) = no_of_sectors_long & 0xff; *(bp+0x21) = (no_of_sectors_long >> 8) & 0xff; *(bp+0x22) = (no_of_sectors_long >> 16) & 0xff; *(bp+0x23) = (no_of_sectors_long >> 24) & 0xff; bp += 0x24; if (sectors_per_fat16 == 0) { *bp++ = sectors_per_fat & 0xff; *bp++ = (sectors_per_fat >> 8) & 0xff; *bp++ = (sectors_per_fat >> 16) & 0xff; *bp++ = (sectors_per_fat >> 24) & 0xff; *bp++ = flags & 0xff; *bp++ = (flags >> 8) & 0xff; *bp++ = version[0]; *bp++ = version[1]; *bp++ = root_cluster & 0xff; *bp++ = (root_cluster >> 8) & 0xff; *bp++ = (root_cluster >> 16) & 0xff; *bp++ = (root_cluster >> 24) & 0xff; *bp++ = info_sector & 0xff; *bp++ = (info_sector >> 8) & 0xff; *bp++ = backup_boot & 0xff; *bp++ = (backup_boot >> 8) & 0xff; bp += 12; /* Skip over reserved bytes */ } *bp = phys_drive_no; bp += 2; *bp++ = signature; *bp++ = serial_number & 0xff; *bp++ = (serial_number >> 8) & 0xff; *bp++ = (serial_number >> 16) & 0xff; *bp++ = (serial_number >> 24) & 0xff; memcpy (bp,volume_label,11); bp += 11; memcpy (bp,file_system_id,8); bp += 8; } /* ----------------------------------------------------------------------- */ /* Extract some misc. drive parameters from BPB */ /* ----------------------------------------------------------------------- */ void logical_drive_info::get (const bios_parameter_block &bpb) { start_fat1 = bpb.reserved_sectors; start_fat2 = start_fat1 + bpb.sectors_per_fat; start_rootdir = start_fat2 + bpb.sectors_per_fat; if (bpb.no_of_rootdir_entries == 0) start_data = start_rootdir; else start_data = start_rootdir + (bpb.no_of_rootdir_entries - 1) / 16 + 1; if (bpb.sectors_per_cluster == 0) no_of_clusters = 0; else { no_of_clusters = ((bpb.no_of_sectors ? bpb.no_of_sectors : bpb.no_of_sectors_long) - start_data) / bpb.sectors_per_cluster; if (bpb.sectors_per_fat16 == 0) no_of_clusters -= 2; } };