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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. HORD encapsulator
  31. """
  32.  
  33. import sys
  34. import os
  35. import struct
  36.  
  37. def align_up(size, alignment):
  38.     "Align upwards to a given alignment"
  39.     return (((size) + ((alignment) - 1)) & ~((alignment) - 1))
  40.  
  41.  
  42. def usage(prname):
  43.     "Print usage syntax"
  44.     print prname + " <ALIGNMENT> <FS_IMAGE> <HORD_IMAGE>"
  45.  
  46. def main():
  47.     if (len(sys.argv) < 4):
  48.         usage(sys.argv[0])
  49.         return
  50.    
  51.     if (not sys.argv[1].isdigit()):
  52.         print "<ALIGNMENT> must be a number"
  53.         return
  54.    
  55.     align = int(sys.argv[1], 0)
  56.     fs_image = os.path.abspath(sys.argv[2])
  57.     if (not os.path.isfile(fs_image)):
  58.         print "<FS_IMAGE> must be a directory"
  59.         return
  60.    
  61.     inf = file(fs_image, "rb")
  62.     outf = file(sys.argv[3], "wb")
  63.  
  64.     header_size = align_up(18, align)
  65.     aligned_size = align_up(os.path.getsize(fs_image), align)
  66.  
  67.    
  68.     outf.write(struct.pack("<4sBBLQ", "HORD", 1, 1, header_size, aligned_size))
  69.     outf.write(struct.pack("<" + ("%d" % (header_size - 18)) + "x"))
  70.    
  71.     outf.write(inf.read())
  72.    
  73.     padding = aligned_size - os.path.getsize(fs_image)
  74.     if (padding > 0):
  75.         outf.write(struct.pack("<" + ("%d" % padding) + "x"))
  76.    
  77.     inf.close()
  78.     outf.close()
  79.  
  80. if __name__ == '__main__':
  81.     main()
  82.