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Annotation of qemu/roms/seabios/tools/buildrom.py, revision 1.1.1.1

1.1       root        1: #!/usr/bin/env python
                      2: # Fill in checksum/size of an option rom, and pad it to proper length.
                      3: #
                      4: # Copyright (C) 2009  Kevin O'Connor <[email protected]>
                      5: #
                      6: # This file may be distributed under the terms of the GNU GPLv3 license.
                      7: 
                      8: import sys
                      9: 
                     10: def alignpos(pos, alignbytes):
                     11:     mask = alignbytes - 1
                     12:     return (pos + mask) & ~mask
                     13: 
                     14: def checksum(data):
                     15:     ords = map(ord, data)
                     16:     return sum(ords)
                     17: 
                     18: def main():
                     19:     inname = sys.argv[1]
                     20:     outname = sys.argv[2]
                     21: 
                     22:     # Read data in
                     23:     f = open(inname, 'rb')
                     24:     data = f.read()
                     25:     count = len(data)
                     26: 
                     27:     # Pad to a 512 byte boundary
                     28:     data += "\0" * (alignpos(count, 512) - count)
                     29:     count = len(data)
                     30: 
                     31:     # Fill in size field; clear checksum field
                     32:     data = data[:2] + chr(count/512) + data[3:6] + "\0" + data[7:]
                     33: 
                     34:     # Checksum rom
                     35:     newsum = (256 - checksum(data)) & 0xff
                     36:     data = data[:6] + chr(newsum) + data[7:]
                     37: 
                     38:     # Write new rom
                     39:     f = open(outname, 'wb')
                     40:     f.write(data)
                     41: 
                     42: if __name__ == '__main__':
                     43:     main()

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