25 lines
758 B
Python
25 lines
758 B
Python
"""
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Defines utility methods for working with gzip streams.
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"""
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import zlib
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# Window size for decompressing GZIP streams.
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# This results in ZLIB automatically detecting the GZIP headers.
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# http://stackoverflow.com/questions/3122145/zlib-error-error-3-while-decompressing-incorrect-header-check/22310760#22310760
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ZLIB_GZIP_WINDOW = zlib.MAX_WBITS | 32
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def calculate_size_handler():
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""" Returns an object and a SocketReader handler. The handler will gunzip the data it receives,
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adding the size found to the object.
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"""
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uncompressed_size_info = {
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'size': 0
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}
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decompressor = zlib.decompressobj(ZLIB_GZIP_WINDOW)
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def fn(buf):
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uncompressed_size_info['size'] += len(decompressor.decompress(buf))
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return uncompressed_size_info, fn
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