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37 lines
1.3 KiB
Python
37 lines
1.3 KiB
Python
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from hachoir.parser import QueryParser
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from hachoir.regex import PatternMatching
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# XXX hachoir.regex uses str but the rest of hachoir uses bytes,
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# which means we have to convert bytes to str using latin1 encoding
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# (the closest "raw bytes" encoding) in order for matching to work.
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class HachoirPatternMatching(PatternMatching):
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def __init__(self, categories=None, parser_ids=None):
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PatternMatching.__init__(self)
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# Load parser list
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tags = []
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if categories:
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tags += [("category", cat) for cat in categories]
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if parser_ids:
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tags += [("id", parser_id) for parser_id in parser_ids]
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if tags:
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tags += [None]
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parser_list = QueryParser(tags)
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# Create string patterns
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for parser in parser_list:
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for (magic, offset) in parser.getParserTags().get("magic", ()):
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self.addString(magic.decode('latin1'), (offset, parser))
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# Create regex patterns
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for parser in parser_list:
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for (regex, offset) in parser.getParserTags().get("magic_regex", ()):
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self.addRegex(regex.decode('latin1'), (offset, parser))
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self.commit()
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def search(self, data):
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for start, stop, item in PatternMatching.search(self, data.decode('latin1')):
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yield (item.user[1], start * 8 - item.user[0])
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