mirror of https://github.com/pbatard/rufus.git
51 lines
2.0 KiB
C
51 lines
2.0 KiB
C
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/*
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* Rufus: The Resourceful USB Formatting Utility
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* MS-DOS boot file extraction, from the FAT12 floppy image in diskcopy.dll
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* Copyright (c) 2011 Pete Batard <pete@akeo.ie>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* http://www.c-jump.com/CIS24/Slides/FAT/lecture.html */
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#define FAT12_ROOTDIR_OFFSET 0x2600
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#define FAT12_ROOTDIR_ENTRY_SIZE 0x20
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#define FAT12_ROOTDIR_NB_ENTRIES 0xE0
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#define FAT12_ROOTDIR_FIRSTCLUSTER 0x1A // No need for high word on a 1.44 MB media
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#define FAT12_ROOTDIR_FILESIZE 0x1C
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#define FAT12_DELETED_ENTRY 0xE5
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/* Ideally, we'd read those from the FAT Boot Sector, but we have
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a pretty good idea of what they are for a 1.44 MB floppy image */
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#define FAT12_CLUSTER_SIZE 0x200 // = sector size
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#define FAT12_DATA_START 0x4200
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#define FAT12_CLUSTER_OFFSET ((FAT12_DATA_START/FAT12_CLUSTER_SIZE)-2) // First cluster in data area is #2
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#ifndef GET_ULONG_LE
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#define GET_ULONG_LE(n,b,i) \
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{ \
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(n) = ( (ULONG) (b)[(i) ] ) \
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| ( (ULONG) (b)[(i) + 1] << 8 ) \
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| ( (ULONG) (b)[(i) + 2] << 16 ) \
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| ( (ULONG) (b)[(i) + 3] << 24 ); \
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}
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#endif
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#ifndef GET_USHORT_LE
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#define GET_USHORT_LE(n,b,i) \
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{ \
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(n) = ( (USHORT) (b)[(i) ] ) \
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| ( (USHORT) (b)[(i) + 1] << 8 ); \
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}
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#endif
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