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60 lines
1.7 KiB
Python
60 lines
1.7 KiB
Python
from struct import unpack
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import os
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def tup2int(tup):
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return int('.' . join(str(x) for x in tup))
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def tup2int():
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SOS = SOSfile.read(2)
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offset_unpacked = unpack ('< H', SOS)
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offset = int('.'.join(str(x) for x in offset_unpacked))
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print 'DEBUG: Inside function. Offset is:', hex(offset)
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return offset
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#Clear SCREEN
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print("\033c");
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#Is File a SOS DRIVER file?
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SOSfile = open('SOSCFFA.DRIVER', 'rb')
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SOS = SOSfile.read(8)
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filetype = unpack('< 8s', SOS)
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if 'SOS DRVR' in filetype:
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print "This is a proper SOS file."
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print "Filetype is: %s." % (filetype)
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else:
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print "This is not a proper SOS file"
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def readUnpackAndint(bytes):
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SOS = SOSfile.read(bytes)
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offset_unpacked = unpack ('< H', SOS)
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return int('.'.join(str(x) for x in offset_unpacked))
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### At this point, we need the first offset to tell us where to jump to
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### find the first actual driver.
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# Read immediate two bytes after SOS DRVR to establish first offset value.
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offset = readUnpackAndint(2)
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print "The first offset value is", hex(offset)
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### Now we have the offset needed to jump to the first driver. Let's seek
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### to that driver using the offset. This is our first jump.
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SOSfile.seek(offset,1)
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print "This is our new position in the file: ", hex(SOSfile.tell())
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offset = readUnpackAndint(2)
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print 'New offset is: ' , hex(offset)
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### I will establish an indefinite loop that will come around until we
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### encounter FF which indicates the last driver. For now, I am manually
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### looping to check logic.
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while offset != 65535 :
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SOSfile.seek(offset,1)
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print "This is our new position in the file: ", hex(SOSfile.tell())
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offset = readUnpackAndint(2)
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print 'New offset is: ' , hex(offset)
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SOSfile.close()
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