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42 lines
1.4 KiB
Python
42 lines
1.4 KiB
Python
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from hachoir.field import Field, FieldSet, ParserError
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class GenericVector(FieldSet):
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def __init__(self, parent, name, nb_items, item_class, item_name="item", description=None):
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# Sanity checks
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assert issubclass(item_class, Field)
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assert isinstance(item_class.static_size, int)
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if not(0 < nb_items):
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raise ParserError('Unable to create empty vector "%s" in %s'
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% (name, parent.path))
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size = nb_items * item_class.static_size
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self.__nb_items = nb_items
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self._item_class = item_class
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self._item_name = item_name
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FieldSet.__init__(self, parent, name, description, size=size)
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def __len__(self):
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return self.__nb_items
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def createFields(self):
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name = self._item_name + "[]"
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parser = self._item_class
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for index in range(len(self)):
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yield parser(self, name)
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class UserVector(GenericVector):
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"""
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To implement:
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- item_name: name of a field without [] (eg. "color" becomes "color[0]"),
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default value is "item"
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- item_class: class of an item
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"""
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item_class = None
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item_name = "item"
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def __init__(self, parent, name, nb_items, description=None):
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GenericVector.__init__(self, parent, name, nb_items,
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self.item_class, self.item_name, description)
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