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38 lines
1.2 KiB
Python
38 lines
1.2 KiB
Python
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import gdb
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import re
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import gdb.printing
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class PuTTYBignumPrettyPrinter(gdb.printing.PrettyPrinter):
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"Pretty-print PuTTY's Bignum type."
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name = "Bignum"
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def __init__(self, val):
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super(PuTTYBignumPrettyPrinter, self).__init__(self.name)
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self.val = val
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def to_string(self):
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type_BignumInt = gdb.lookup_type("BignumInt")
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type_BignumIntPtr = type_BignumInt.pointer()
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BIGNUM_INT_BITS = 8 * type_BignumInt.sizeof
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array = self.val.cast(type_BignumIntPtr)
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aget = lambda i: int(array[i]) & ((1 << BIGNUM_INT_BITS)-1)
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try:
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length = aget(0)
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value = 0
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for i in range(length):
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value |= aget(i+1) << (BIGNUM_INT_BITS * i)
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return "Bignum({:#x})".format(value)
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except gdb.MemoryError:
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address = int(array)
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if address == 0:
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return "Bignum(NULL)".format(address)
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return "Bignum(invalid @ {:#x})".format(address)
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rcpp = gdb.printing.RegexpCollectionPrettyPrinter("PuTTY")
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rcpp.add_printer(PuTTYBignumPrettyPrinter.name, "^Bignum$",
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PuTTYBignumPrettyPrinter)
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gdb.printing.register_pretty_printer(None, rcpp)
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