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3264 decky 1
#!/usr/bin/env python
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#
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# Copyright (c) 2008 Martin Decky
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# - Redistributions of source code must retain the above copyright
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#   notice, this list of conditions and the following disclaimer.
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# - Redistributions in binary form must reproduce the above copyright
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#   notice, this list of conditions and the following disclaimer in the
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#   documentation and/or other materials provided with the distribution.
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# - The name of the author may not be used to endorse or promote products
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#   derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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"""
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FAT creator
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"""
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import sys
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import os
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import random
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import xstruct
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BOOT_SECTOR = """little:
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    uint8_t jmp[3]             /* jump instruction */
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    char oem[8]                /* OEM string */
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    uint16_t sector            /* bytes per sector */
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    uint8_t cluster            /* sectors per cluster */
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    uint16_t reserved          /* reserved sectors */
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    uint8_t fats               /* number of FATs */
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    uint16_t rootdir           /* root directory entries */
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    uint16_t sectors           /* total number of sectors */
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    uint8_t descriptor         /* media descriptor */
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    uint16_t fat_sectors       /* sectors per single FAT */
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    uint16_t track_sectors     /* sectors per track */
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    uint16_t heads             /* number of heads */
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    uint32_t hidden            /* hidden sectors */
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    uint32_t sectors_big       /* total number of sectors (if sectors == 0) */
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    /* Extended BIOS Parameter Block */
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    uint8_t drive              /* physical drive number */
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    padding[1]                 /* reserved (current head) */
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    uint8_t extboot_signature  /* extended boot signature */
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    uint32_t serial            /* serial number */
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    char label[11]             /* volume label */
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    char fstype[8]             /* filesystem type */
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    padding[448]               /* boot code */
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    uint8_t boot_signature[2]  /* boot signature */
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"""
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def usage(prname):
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    "Print usage syntax"
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    print prname + " <PATH> <IMAGE>"
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def main():
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    if (len(sys.argv) < 3):
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        usage(sys.argv[0])
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        return
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    path = os.path.abspath(sys.argv[1])
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    if (not os.path.isdir(path)):
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        print "<PATH> must be a directory"
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        return
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    outf = file(sys.argv[2], "w")
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    boot_sector = xstruct.create(BOOT_SECTOR)
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    boot_sector.jmp = [0xEB, 0x3C, 0x90]
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    boot_sector.oem = "MSDOS5.0"
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    boot_sector.sector = 512
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    boot_sector.cluster = 8 # 4096 bytes per cluster
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    boot_sector.reserved = 1
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    boot_sector.fats = 2
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    boot_sector.rootdir = 224 # FIXME: root directory should be sector aligned
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    boot_sector.sectors = 0 # FIXME
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    boot_sector.descriptor = 0xF8
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    boot_sector.fat_sectors = 0 # FIXME
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    boot_sector.track_sectors = 0 # FIXME
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    boot_sector.heads = 0 # FIXME
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    boot_sector.hidden = 0
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    boot_sector.sectors_big = 0 # FIXME
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    boot_sector.drive = 0
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    boot_sector.extboot_signature = 0x29
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    boot_sector.serial = random.randint(0, 0xFFFFFFFF)
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    boot_sector.label = "HELENOS"
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    boot_sector.fstype = "FAT16   "
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    boot_sector.boot_signature = [0x55, 0xAA]
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    outf.write(boot_sector.pack())
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    outf.close()
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if __name__ == '__main__':
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    main()