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49 lines
1.3 KiB
Python
49 lines
1.3 KiB
Python
from hachoir.field import FieldSet, RawBytes
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from hachoir.stream import StringInputStream
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class FragmentGroup:
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def __init__(self, parser):
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self.items = []
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self.parser = parser
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self.args = {}
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def add(self, item):
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self.items.append(item)
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def createInputStream(self):
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# FIXME: Use lazy stream creation
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data = []
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for item in self.items:
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data.append(item["rawdata"].value)
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data = b"".join(data)
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tags = {"args": self.args}
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if self.parser is not None:
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tags["class"] = self.parser
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tags = iter(tags.items())
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return StringInputStream(data, "<fragment group>", tags=tags)
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class CustomFragment(FieldSet):
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def __init__(self, parent, name, size, parser, description=None, group=None):
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FieldSet.__init__(self, parent, name, description, size=size)
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if not group:
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group = FragmentGroup(parser)
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self.field_size = size
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self.group = group
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self.group.add(self)
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def createFields(self):
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yield RawBytes(self, "rawdata", self.field_size // 8)
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def _createInputStream(self, **args):
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return self.group.createInputStream()
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def createValue(self):
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return self["rawdata"].value
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def createDisplay(self):
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return self["rawdata"].display
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