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51 lines
1.6 KiB
Python
51 lines
1.6 KiB
Python
from hachoir.core.endian import BIG_ENDIAN, LITTLE_ENDIAN, MIDDLE_ENDIAN
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from hachoir.field import GenericFieldSet
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from hachoir.core.log import Logger
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import hachoir.core.config as config
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class Parser(GenericFieldSet):
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"""
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A parser is the root of all other fields. It create first level of fields
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and have special attributes and methods:
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- endian: Byte order (L{BIG_ENDIAN}, L{LITTLE_ENDIAN} or L{MIDDLE_ENDIAN}) of input data ;
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- stream: Data input stream (set in L{__init__()}) ;
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- size: Field set size will be size of input stream.
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"""
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def __init__(self, stream, description=None):
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"""
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Parser constructor
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@param stream: Data input stream (see L{InputStream})
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@param description: (optional) String description
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"""
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# Check arguments
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assert hasattr(self, "endian") \
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and self.endian in (BIG_ENDIAN, LITTLE_ENDIAN, MIDDLE_ENDIAN)
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# Call parent constructor
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GenericFieldSet.__init__(
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self, None, "root", stream, description, stream.askSize(self))
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def close(self):
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self.stream.close()
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def __enter__(self):
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return self
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def __exit__(self, type, value, traceback):
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self.close()
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def _logger(self):
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return Logger._logger(self)
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def _setSize(self, size):
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self._truncate(size)
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self.raiseEvent("field-resized", self)
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size = property(lambda self: self._size, doc="Size in bits")
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path = property(lambda self: "/")
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# dummy definition to prevent hachoir-core from depending on hachoir-parser
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autofix = property(lambda self: config.autofix)
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