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35 lines
946 B
Python
35 lines
946 B
Python
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from hachoir.field import CompressedField
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try:
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from zlib import decompressobj, MAX_WBITS
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class DeflateStream:
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def __init__(self, stream, wbits=None):
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if wbits:
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self.gzip = decompressobj(-MAX_WBITS)
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else:
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self.gzip = decompressobj()
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def __call__(self, size, data=None):
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if data is None:
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data = b''
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return self.gzip.decompress(self.gzip.unconsumed_tail + data, size)
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class DeflateStreamWbits(DeflateStream):
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def __init__(self, stream):
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DeflateStream.__init__(self, stream, True)
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def Deflate(field, wbits=True):
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if wbits:
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CompressedField(field, DeflateStreamWbits)
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else:
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CompressedField(field, DeflateStream)
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return field
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has_deflate = True
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except ImportError:
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def Deflate(field, wbits=True):
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return field
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has_deflate = False
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