| 1 | #!/usr/bin/env python
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| 2 | #
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| 3 | # Copyright (c) 2008 Martin Decky
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| 4 | # All rights reserved.
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| 5 | #
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| 6 | # Redistribution and use in source and binary forms, with or without
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| 7 | # modification, are permitted provided that the following conditions
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| 8 | # are met:
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| 9 | #
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| 10 | # - Redistributions of source code must retain the above copyright
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| 11 | # notice, this list of conditions and the following disclaimer.
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| 12 | # - Redistributions in binary form must reproduce the above copyright
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| 13 | # notice, this list of conditions and the following disclaimer in the
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| 14 | # documentation and/or other materials provided with the distribution.
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| 15 | # - The name of the author may not be used to endorse or promote products
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| 16 | # derived from this software without specific prior written permission.
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| 17 | #
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| 18 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 19 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 20 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 21 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 22 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 23 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 24 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 25 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 26 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 27 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 28 | #
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| 29 | """
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| 30 | FAT creator
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| 31 | """
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| 32 |
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| 33 | import sys
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| 34 | import os
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| 35 | import random
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| 36 | import xstruct
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| 37 |
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| 38 | BOOT_SECTOR = """little:
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| 39 | uint8_t jmp[3] /* jump instruction */
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| 40 | char oem[8] /* OEM string */
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| 41 | uint16_t sector /* bytes per sector */
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| 42 | uint8_t cluster /* sectors per cluster */
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| 43 | uint16_t reserved /* reserved sectors */
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| 44 | uint8_t fats /* number of FATs */
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| 45 | uint16_t rootdir /* root directory entries */
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| 46 | uint16_t sectors /* total number of sectors */
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| 47 | uint8_t descriptor /* media descriptor */
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| 48 | uint16_t fat_sectors /* sectors per single FAT */
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| 49 | uint16_t track_sectors /* sectors per track */
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| 50 | uint16_t heads /* number of heads */
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| 51 | uint32_t hidden /* hidden sectors */
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| 52 | uint32_t sectors_big /* total number of sectors (if sectors == 0) */
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| 53 |
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| 54 | /* Extended BIOS Parameter Block */
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| 55 | uint8_t drive /* physical drive number */
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| 56 | padding[1] /* reserved (current head) */
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| 57 | uint8_t extboot_signature /* extended boot signature */
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| 58 | uint32_t serial /* serial number */
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| 59 | char label[11] /* volume label */
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| 60 | char fstype[8] /* filesystem type */
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| 61 | padding[448] /* boot code */
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| 62 | uint8_t boot_signature[2] /* boot signature */
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| 63 | """
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| 64 |
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| 65 | def usage(prname):
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| 66 | "Print usage syntax"
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| 67 | print prname + " <PATH> <IMAGE>"
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| 68 |
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| 69 | def main():
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| 70 | if (len(sys.argv) < 3):
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| 71 | usage(sys.argv[0])
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| 72 | return
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| 73 |
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| 74 | path = os.path.abspath(sys.argv[1])
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| 75 | if (not os.path.isdir(path)):
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| 76 | print "<PATH> must be a directory"
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| 77 | return
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| 78 |
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| 79 | outf = file(sys.argv[2], "w")
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| 80 |
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| 81 | boot_sector = xstruct.create(BOOT_SECTOR)
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| 82 | boot_sector.jmp = [0xEB, 0x3C, 0x90]
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| 83 | boot_sector.oem = "MSDOS5.0"
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| 84 | boot_sector.sector = 512
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| 85 | boot_sector.cluster = 8 # 4096 bytes per cluster
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| 86 | boot_sector.reserved = 1
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| 87 | boot_sector.fats = 2
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| 88 | boot_sector.rootdir = 224 # FIXME: root directory should be sector aligned
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| 89 | boot_sector.sectors = 0 # FIXME
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| 90 | boot_sector.descriptor = 0xF8
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| 91 | boot_sector.fat_sectors = 0 # FIXME
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| 92 | boot_sector.track_sectors = 0 # FIXME
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| 93 | boot_sector.heads = 0 # FIXME
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| 94 | boot_sector.hidden = 0
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| 95 | boot_sector.sectors_big = 0 # FIXME
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| 96 |
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| 97 | boot_sector.drive = 0
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| 98 | boot_sector.extboot_signature = 0x29
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| 99 | boot_sector.serial = random.randint(0, 0xFFFFFFFF)
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| 100 | boot_sector.label = "HELENOS"
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| 101 | boot_sector.fstype = "FAT16 "
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| 102 | boot_sector.boot_signature = [0x55, 0xAA]
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| 103 |
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| 104 | outf.write(boot_sector.pack())
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| 105 |
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| 106 | outf.close()
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| 107 |
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| 108 | if __name__ == '__main__':
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| 109 | main()
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