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68 lines
1.7 KiB
Python
68 lines
1.7 KiB
Python
"""
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Bit sized classes:
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- Bit: Single bit, value is False or True ;
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- Bits: Integer with a size in bits ;
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- RawBits: unknown content with a size in bits.
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"""
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from hachoir_core.field import Field
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from hachoir_core.i18n import _
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from hachoir_core import config
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class RawBits(Field):
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"""
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Unknown content with a size in bits.
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"""
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static_size = staticmethod(lambda *args, **kw: args[1])
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def __init__(self, parent, name, size, description=None):
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"""
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Constructor: see L{Field.__init__} for parameter description
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"""
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Field.__init__(self, parent, name, size, description)
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def hasValue(self):
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return True
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def createValue(self):
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return self._parent.stream.readBits(
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self.absolute_address, self._size, self._parent.endian)
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def createDisplay(self):
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if self._size < config.max_bit_length:
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return unicode(self.value)
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else:
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return _("<%s size=%u>" %
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(self.__class__.__name__, self._size))
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createRawDisplay = createDisplay
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class Bits(RawBits):
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"""
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Positive integer with a size in bits
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@see: L{Bit}
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@see: L{RawBits}
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"""
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pass
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class Bit(RawBits):
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"""
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Single bit: value can be False or True, and size is exactly one bit.
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@see: L{Bits}
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"""
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static_size = 1
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def __init__(self, parent, name, description=None):
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"""
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Constructor: see L{Field.__init__} for parameter description
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"""
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RawBits.__init__(self, parent, name, 1, description=description)
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def createValue(self):
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return 1 == self._parent.stream.readBits(
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self.absolute_address, 1, self._parent.endian)
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def createRawDisplay(self):
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return unicode(int(self.value))
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