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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. TMPFS creator
  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. def usage(prname):
  42.     "Print usage syntax"
  43.     print prname + " <ALIGNMENT> <PATH> <IMAGE>"
  44.  
  45. def recursion(root, outf):
  46.     "Recursive directory walk"
  47.    
  48.     payload_size = 0
  49.    
  50.     for name in os.listdir(root):
  51.         canon = os.path.join(root, name)
  52.        
  53.         if (os.path.isfile(canon)):
  54.             outf.write(struct.pack("<BL" + ("%d" % len(name)) + "s", 1, len(name), name))
  55.             payload_size += 5 + len(name)
  56.             size = os.path.getsize(canon)
  57.             rd = 0;
  58.             outf.write(struct.pack("<L", size))
  59.             payload_size += 4
  60.            
  61.             inf = file(canon, "r")
  62.             while (rd < size):
  63.                 data = inf.read(4096);
  64.                 outf.write(data)
  65.                 payload_size += len(data)
  66.                 rd += len(data)
  67.             inf.close()
  68.        
  69.         if (os.path.isdir(canon)):
  70.             outf.write(struct.pack("<BL" + ("%d" % len(name)) + "s", 2, len(name), name))
  71.             payload_size += 5 + len(name)
  72.             payload_size += recursion(canon, outf)
  73.             outf.write(struct.pack("<BL", 0, 0))
  74.             payload_size += 5
  75.    
  76.     return payload_size
  77.  
  78. def main():
  79.     if (len(sys.argv) < 4):
  80.         usage(sys.argv[0])
  81.         return
  82.    
  83.     if (not sys.argv[1].isdigit()):
  84.         print "<ALIGNMENT> must be a number"
  85.         return
  86.    
  87.     align = int(sys.argv[1], 0)
  88.     path = os.path.abspath(sys.argv[2])
  89.     if (not os.path.isdir(path)):
  90.         print "<PATH> must be a directory"
  91.         return
  92.    
  93.     header_size = align_up(18, align)
  94.     outf = file(sys.argv[3], "w")
  95.     outf.write(struct.pack("<" + ("%d" % header_size) + "x"))
  96.    
  97.     outf.write(struct.pack("<5s", "TMPFS"))
  98.     payload_size = 5
  99.    
  100.     payload_size += recursion(path, outf)
  101.        
  102.     outf.write(struct.pack("<BL", 0, 0))
  103.     payload_size += 5
  104.    
  105.     aligned_size = align_up(payload_size, align)
  106.    
  107.     if (aligned_size - payload_size > 0):
  108.         outf.write(struct.pack("<" + ("%d" % (aligned_size - payload_size)) + "x"))
  109.        
  110.     outf.seek(0)
  111.     outf.write(struct.pack("<4sBBLQ", "HORD", 1, 1, header_size, aligned_size))
  112.     outf.close()
  113.  
  114. if __name__ == '__main__':
  115.     main()
  116.