Coverage for scrapy/utils/gz : 100%

import struct 

from cStringIO import StringIO 

from gzip import GzipFile 

def gunzip(data): 

    """Gunzip the given data and return as much data as possible. 

    This is resilient to CRC checksum errors. 

    """ 

    f = GzipFile(fileobj=StringIO(data)) 

    output = '' 

    chunk = '.' 

    while chunk: 

        try: 

            chunk = f.read(8196) 

            output += chunk 

        except (IOError, struct.error): 

            # complete only if there is some data, otherwise re-raise 

            # see issue 87 about catching struct.error 

            if output: 

                output += f.extrabuf 

                break 

            else: 

                raise 

    return output 

def is_gzipped(response): 

    """Return True if the response is gzipped, or False otherwise""" 

    ctype = response.headers.get('Content-Type', '') 

    return ctype in ('application/x-gzip', 'application/gzip')