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  1. #!/usr/bin/env python
  2. #
  3. # Copyright (c) 2008 Martin Decky
  4. # All rights reserved.
  5. #
  6. # Redistribution and use in source and binary forms, with or without
  7. # modification, are permitted provided that the following conditions
  8. # are met:
  9. #
  10. # - Redistributions of source code must retain the above copyright
  11. #   notice, this list of conditions and the following disclaimer.
  12. # - Redistributions in binary form must reproduce the above copyright
  13. #   notice, this list of conditions and the following disclaimer in the
  14. #   documentation and/or other materials provided with the distribution.
  15. # - The name of the author may not be used to endorse or promote products
  16. #   derived from this software without specific prior written permission.
  17. #
  18. # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19. # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20. # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21. # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22. # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23. # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24. # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25. # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26. # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27. # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28. #
  29. """
  30. FAT creator
  31. """
  32.  
  33. import sys
  34. import os
  35. import random
  36. import xstruct
  37.  
  38. BOOT_SECTOR = """little:
  39.     uint8_t jmp[3]             /* jump instruction */
  40.     char oem[8]                /* OEM string */
  41.     uint16_t sector            /* bytes per sector */
  42.     uint8_t cluster            /* sectors per cluster */
  43.     uint16_t reserved          /* reserved sectors */
  44.     uint8_t fats               /* number of FATs */
  45.     uint16_t rootdir           /* root directory entries */
  46.     uint16_t sectors           /* total number of sectors */
  47.     uint8_t descriptor         /* media descriptor */
  48.     uint16_t fat_sectors       /* sectors per single FAT */
  49.     uint16_t track_sectors     /* sectors per track */
  50.     uint16_t heads             /* number of heads */
  51.     uint32_t hidden            /* hidden sectors */
  52.     uint32_t sectors_big       /* total number of sectors (if sectors == 0) */
  53.    
  54.     /* Extended BIOS Parameter Block */
  55.     uint8_t drive              /* physical drive number */
  56.     padding[1]                 /* reserved (current head) */
  57.     uint8_t extboot_signature  /* extended boot signature */
  58.     uint32_t serial            /* serial number */
  59.     char label[11]             /* volume label */
  60.     char fstype[8]             /* filesystem type */
  61.     padding[448]               /* boot code */
  62.     uint8_t boot_signature[2]  /* boot signature */
  63. """
  64.  
  65. def usage(prname):
  66.     "Print usage syntax"
  67.     print prname + " <PATH> <IMAGE>"
  68.  
  69. def main():
  70.     if (len(sys.argv) < 3):
  71.         usage(sys.argv[0])
  72.         return
  73.    
  74.     path = os.path.abspath(sys.argv[1])
  75.     if (not os.path.isdir(path)):
  76.         print "<PATH> must be a directory"
  77.         return
  78.    
  79.     outf = file(sys.argv[2], "w")
  80.    
  81.     boot_sector = xstruct.create(BOOT_SECTOR)
  82.     boot_sector.jmp = [0xEB, 0x3C, 0x90]
  83.     boot_sector.oem = "MSDOS5.0"
  84.     boot_sector.sector = 512
  85.     boot_sector.cluster = 8 # 4096 bytes per cluster
  86.     boot_sector.reserved = 1
  87.     boot_sector.fats = 2
  88.     boot_sector.rootdir = 224 # FIXME: root directory should be sector aligned
  89.     boot_sector.sectors = 0 # FIXME
  90.     boot_sector.descriptor = 0xF8
  91.     boot_sector.fat_sectors = 0 # FIXME
  92.     boot_sector.track_sectors = 0 # FIXME
  93.     boot_sector.heads = 0 # FIXME
  94.     boot_sector.hidden = 0
  95.     boot_sector.sectors_big = 0 # FIXME
  96.    
  97.     boot_sector.drive = 0
  98.     boot_sector.extboot_signature = 0x29
  99.     boot_sector.serial = random.randint(0, 0xFFFFFFFF)
  100.     boot_sector.label = "HELENOS"
  101.     boot_sector.fstype = "FAT16   "
  102.     boot_sector.boot_signature = [0x55, 0xAA]
  103.    
  104.     outf.write(boot_sector.pack())
  105.    
  106.     outf.close()
  107.    
  108. if __name__ == '__main__':
  109.     main()
  110.