33 lines
867 B
Python
33 lines
867 B
Python
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from abc import ABC
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from construct import Subconstruct
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class TellPlusSizeOf(Subconstruct, ABC):
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def __init__(self, subcon):
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super(TellPlusSizeOf, self).__init__(subcon)
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self.flagbuildnone = True
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def _parse(self, stream, context, path):
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return stream.tell() + self.subcon.sizeof(context=context)
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def _build(self, obj, stream, context, path):
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return b""
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def sizeof(self, context=None, **kw):
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return 0
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class TellMinusSizeOf(Subconstruct, ABC):
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def __init__(self, subcon):
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super(TellMinusSizeOf, self).__init__(subcon)
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self.flagbuildnone = True
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def _parse(self, stream, context, path):
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return stream.tell() - self.subcon.sizeof(context=context)
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def _build(self, obj, stream, context, path):
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return b""
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def sizeof(self, context=None, **kw):
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return 0
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