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41 lines
1.4 KiB
Python
41 lines
1.4 KiB
Python
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from hachoir.core.endian import BIG_ENDIAN, LITTLE_ENDIAN
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from hachoir.field import RawBytes, RootSeekableFieldSet, ParserError
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from hachoir.parser import HachoirParser
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class OLE2FragmentParser(HachoirParser, RootSeekableFieldSet):
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tags = {
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"description": "Microsoft Office document subfragments",
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}
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endian = LITTLE_ENDIAN
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ENDIAN_CHECK = False
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def __init__(self, stream, **args):
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RootSeekableFieldSet.__init__(
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self, None, "root", stream, None, stream.askSize(self))
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HachoirParser.__init__(self, stream, **args)
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if self.ENDIAN_CHECK:
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if self["endian"].value == b"\xFF\xFE":
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self.endian = BIG_ENDIAN
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elif self["endian"].value == b"\xFE\xFF":
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self.endian = LITTLE_ENDIAN
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else:
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raise ParserError("OLE2: Invalid endian value")
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def validate(self):
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if self.ENDIAN_CHECK:
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if self["endian"].value not in ["\xFF\xFE", "\xFE\xFF"]:
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return "Unknown endian value %s" % self["endian"].value.encode('hex')
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return True
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class RawParser(OLE2FragmentParser):
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ENDIAN_CHECK = False
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OS_CHECK = False
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def createFields(self):
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yield RawBytes(self, "rawdata", self.datasize)
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if self.datasize < self.size // 8:
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yield RawBytes(self, "slack_space", (self.size // 8) - self.datasize)
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