def process_iis_directory(d):
    print('Processing IIS directory %s' % d)
    for entry in os.listdir(d):
        entry = os.path.join(d, entry)
        if entry.endswith('.gz'):
            print('Processing %s into CSV' % entry)
            with gzip.open(entry, 'rb') as uncompressed, \
                    io.BufferedReader(uncompressed) as buffered, \
                    io.TextIOWrapper(buffered, encoding='latin1') as infile, \
                    io.open(os.path.splitext(entry)[0] + '.csv', 'wb') as outfile, \
                    iis.IISSource(infile) as source, \
                    csv.CSVTarget(outfile) as target:
                for row in source:
                    target.write(row)