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25 lines
745 B
Python
25 lines
745 B
Python
# -*- coding: utf-8 -*-
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""" Various functions related to pointer and address math. Mostly to avoid
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depedency loops.
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"""
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def calculate_bank(address):
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"""you are too lazy to divide on your own?"""
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if type(address) == str:
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address = int(address, 16)
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#if 0x4000 <= address <= 0x7FFF:
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# raise Exception, "bank 1 does not exist"
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return int(address) / 0x4000
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def calculate_pointer(short_pointer, bank=None):
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"""calculates the full address given a 4-byte pointer and bank byte"""
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short_pointer = int(short_pointer)
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if 0x4000 <= short_pointer <= 0x7fff:
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short_pointer -= 0x4000
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bank = int(bank)
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else:
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bank = 0
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pointer = short_pointer + (bank * 0x4000)
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return pointer
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