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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. import xstruct
  37.  
  38. HEADER = xstruct.convert("little: "
  39.     "char[4]   /* 'HORD' */ "
  40.     "uint8_t   /* version */ "
  41.     "uint8_t   /* encoding */ "
  42.     "uint32_t  /* header size */ "
  43.     "uint64_t  /* payload size */ "
  44. )
  45.  
  46. HORD_VERSION = 1
  47. HORD_LSB = 1
  48.  
  49. def align_up(size, alignment):
  50.     "Align upwards to a given alignment"
  51.     return (((size) + ((alignment) - 1)) & ~((alignment) - 1))
  52.  
  53. def usage(prname):
  54.     "Print usage syntax"
  55.     print prname + " <ALIGNMENT> <FS_IMAGE> <HORD_IMAGE>"
  56.  
  57. def main():
  58.     if (len(sys.argv) < 4):
  59.         usage(sys.argv[0])
  60.         return
  61.    
  62.     if (not sys.argv[1].isdigit()):
  63.         print "<ALIGNMENT> must be a number"
  64.         return
  65.    
  66.     align = int(sys.argv[1], 0)
  67.     if (align <= 0):
  68.         print "<ALIGNMENT> must be positive"
  69.         return
  70.    
  71.     fs_image = os.path.abspath(sys.argv[2])
  72.     if (not os.path.isfile(fs_image)):
  73.         print "<FS_IMAGE> must be a file"
  74.         return
  75.    
  76.     inf = file(fs_image, "rb")
  77.     outf = file(sys.argv[3], "wb")
  78.    
  79.     header_size = struct.calcsize(HEADER)
  80.     payload_size = os.path.getsize(fs_image)
  81.    
  82.     header_size_aligned = align_up(header_size, align)
  83.     payload_size_aligned = align_up(payload_size, align)
  84.    
  85.     outf.write(struct.pack(HEADER, "HORD", HORD_VERSION, HORD_LSB, header_size_aligned, payload_size_aligned))
  86.     outf.write(xstruct.little_padding(header_size_aligned - header_size))
  87.    
  88.     outf.write(inf.read())
  89.    
  90.     padding = payload_size_aligned - payload_size
  91.     if (padding > 0):
  92.         outf.write(xstruct.little_padding(padding))
  93.    
  94.     inf.close()
  95.     outf.close()
  96.  
  97. if __name__ == '__main__':
  98.     main()
  99.