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