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Annotation of qemu/scripts/signrom.py, revision 1.1.1.1

1.1       root        1: #
                      2: # Option ROM signing utility
                      3: #
                      4: # Authors:
                      5: #  Jan Kiszka <[email protected]>
                      6: #
                      7: # This work is licensed under the terms of the GNU GPL, version 2 or later.
                      8: # See the COPYING file in the top-level directory.
                      9: 
                     10: import sys
                     11: import struct
                     12: 
                     13: if len(sys.argv) < 3:
                     14:     print('usage: signrom.py input output')
                     15:     sys.exit(1)
                     16: 
                     17: fin = open(sys.argv[1], 'rb')
                     18: fout = open(sys.argv[2], 'wb')
                     19: 
                     20: fin.seek(2)
                     21: size = ord(fin.read(1)) * 512 - 1
                     22: 
                     23: fin.seek(0)
                     24: data = fin.read(size)
                     25: fout.write(data)
                     26: 
                     27: checksum = 0
                     28: for b in data:
                     29:     # catch Python 2 vs. 3 differences
                     30:     if isinstance(b, int):
                     31:         checksum += b
                     32:     else:
                     33:         checksum += ord(b)
                     34: checksum = (256 - checksum) % 256
                     35: 
                     36: # Python 3 no longer allows chr(checksum)
                     37: fout.write(struct.pack('B', checksum))
                     38: 
                     39: fin.close()
                     40: fout.close()

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