1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
# $Id: gzip_consumer.py 271 2004-10-09 10:50:59Z fredrik $
# gzip consumer
#
# Copyright (c) 2001-2004 by Fredrik Lundh. All rights reserved.
#
##
# Consumer wrapper for GZIP streams.
class GzipConsumer:
def __init__(self, consumer):
self.__consumer = consumer
self.__decoder = None
self.__data = ""
def __getattr__(self, key):
return getattr(self.__consumer, key)
def feed(self, data):
if self.__decoder is None:
# check if we have a full gzip header
data = self.__data + data
try:
i = 10
flag = ord(data[3])
if flag & 4: # extra
x = ord(data[i]) + 256*ord(data[i+1])
i = i + 2 + x
if flag & 8: # filename
while ord(data[i]):
i = i + 1
i = i + 1
if flag & 16: # comment
while ord(data[i]):
i = i + 1
i = i + 1
if flag & 2: # crc
i = i + 2
if len(data) < i:
raise IndexError("not enough data")
if data[:3] != "\x1f\x8b\x08":
raise IOError("invalid gzip data")
data = data[i:]
except IndexError:
self.__data = data
return # need more data
import zlib
self.__data = ""
self.__decoder = zlib.decompressobj(-zlib.MAX_WBITS)
data = self.__decoder.decompress(data)
if data:
self.__consumer.feed(data)
def close(self):
if self.__decoder:
data = self.__decoder.flush()
if data:
self.__consumer.feed(data)
self.__consumer.close()
|