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compat_urllib_parse_unquote: crash fix: only decode valid hex
on python 2 the following has a { "crash_rate": "100%" } of the time as it tries to parse '" ' as hex.
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@ -94,6 +94,8 @@ def compat_urllib_parse_unquote(string, encoding='utf-8', errors='replace'):
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try:
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if not item:
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raise ValueError
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if not re.match('[0-9a-fA-F][0-9a-fA-F]',item[:2]):
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raise ValueError
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pct_sequence += item[:2].decode('hex')
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rest = item[2:]
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if not rest:
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