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
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
:mod:`zlib` --- Compression compatible with :program:`gzip`
===========================================================
.. module:: zlib
:synopsis: Low-level interface to compression and decompression routines compatible with
gzip.
For applications that require data compression, the functions in this module
allow compression and decompression, using the zlib library. The zlib library
has its own home page at http://www.zlib.net. There are known
incompatibilities between the Python module and versions of the zlib library
earlier than 1.1.3; 1.1.3 has a security vulnerability, so we recommend using
1.1.4 or later.
zlib's functions have many options and often need to be used in a particular
order. This documentation doesn't attempt to cover all of the permutations;
consult the zlib manual at http://www.zlib.net/manual.html for authoritative
information.
For reading and writing ``.gz`` files see the :mod:`gzip` module. For
other archive formats, see the :mod:`bz2`, :mod:`zipfile`, and
:mod:`tarfile` modules.
The available exception and functions in this module are:
.. exception:: error
Exception raised on compression and decompression errors.
.. function:: adler32(string[, value])
Computes a Adler-32 checksum of *string*. (An Adler-32 checksum is almost as
reliable as a CRC32 but can be computed much more quickly.) If *value* is
present, it is used as the starting value of the checksum; otherwise, a fixed
default value is used. This allows computing a running checksum over the
concatenation of several input strings. The algorithm is not cryptographically
strong, and should not be used for authentication or digital signatures. Since
the algorithm is designed for use as a checksum algorithm, it is not suitable
for use as a general hash algorithm.
This function always returns an integer object.
.. versionchanged:: 2.6
For consistent cross-platform behavior we always return a signed integer.
ie: Results in the (2**31)...(2**32-1) range will be negative.
.. function:: compress(string[, level])
Compresses the data in *string*, returning a string contained compressed data.
*level* is an integer from ``1`` to ``9`` controlling the level of compression;
``1`` is fastest and produces the least compression, ``9`` is slowest and
produces the most. The default value is ``6``. Raises the :exc:`error`
exception if any error occurs.
.. function:: compressobj([level])
Returns a compression object, to be used for compressing data streams that won't
fit into memory at once. *level* is an integer from ``1`` to ``9`` controlling
the level of compression; ``1`` is fastest and produces the least compression,
``9`` is slowest and produces the most. The default value is ``6``.
.. function:: crc32(string[, value])
.. index::
single: Cyclic Redundancy Check
single: checksum; Cyclic Redundancy Check
Computes a CRC (Cyclic Redundancy Check) checksum of *string*. If *value* is
present, it is used as the starting value of the checksum; otherwise, a fixed
default value is used. This allows computing a running checksum over the
concatenation of several input strings. The algorithm is not cryptographically
strong, and should not be used for authentication or digital signatures. Since
the algorithm is designed for use as a checksum algorithm, it is not suitable
for use as a general hash algorithm.
This function always returns an integer object.
.. versionchanged:: 2.6
For consistent cross-platform behavior we always return a signed integer.
ie: Results in the (2**31)...(2**32-1) range will be negative.
.. function:: decompress(string[, wbits[, bufsize]])
Decompresses the data in *string*, returning a string containing the
uncompressed data. The *wbits* parameter controls the size of the window
buffer. If *bufsize* is given, it is used as the initial size of the output
buffer. Raises the :exc:`error` exception if any error occurs.
The absolute value of *wbits* is the base two logarithm of the size of the
history buffer (the "window size") used when compressing data. Its absolute
value should be between 8 and 15 for the most recent versions of the zlib
library, larger values resulting in better compression at the expense of greater
memory usage. The default value is 15. When *wbits* is negative, the standard
:program:`gzip` header is suppressed; this is an undocumented feature of the
zlib library, used for compatibility with :program:`unzip`'s compression file
format.
*bufsize* is the initial size of the buffer used to hold decompressed data. If
more space is required, the buffer size will be increased as needed, so you
don't have to get this value exactly right; tuning it will only save a few calls
to :cfunc:`malloc`. The default size is 16384.
.. function:: decompressobj([wbits])
Returns a decompression object, to be used for decompressing data streams that
won't fit into memory at once. The *wbits* parameter controls the size of the
window buffer.
Compression objects support the following methods:
.. method:: Compress.compress(string)
Compress *string*, returning a string containing compressed data for at least
part of the data in *string*. This data should be concatenated to the output
produced by any preceding calls to the :meth:`compress` method. Some input may
be kept in internal buffers for later processing.
.. method:: Compress.flush([mode])
All pending input is processed, and a string containing the remaining compressed
output is returned. *mode* can be selected from the constants
:const:`Z_SYNC_FLUSH`, :const:`Z_FULL_FLUSH`, or :const:`Z_FINISH`,
defaulting to :const:`Z_FINISH`. :const:`Z_SYNC_FLUSH` and
:const:`Z_FULL_FLUSH` allow compressing further strings of data, while
:const:`Z_FINISH` finishes the compressed stream and prevents compressing any
more data. After calling :meth:`flush` with *mode* set to :const:`Z_FINISH`,
the :meth:`compress` method cannot be called again; the only realistic action is
to delete the object.
.. method:: Compress.copy()
Returns a copy of the compression object. This can be used to efficiently
compress a set of data that share a common initial prefix.
.. versionadded:: 2.5
Decompression objects support the following methods, and two attributes:
.. attribute:: Decompress.unused_data
A string which contains any bytes past the end of the compressed data. That is,
this remains ``""`` until the last byte that contains compression data is
available. If the whole string turned out to contain compressed data, this is
``""``, the empty string.
The only way to determine where a string of compressed data ends is by actually
decompressing it. This means that when compressed data is contained part of a
larger file, you can only find the end of it by reading data and feeding it
followed by some non-empty string into a decompression object's
:meth:`decompress` method until the :attr:`unused_data` attribute is no longer
the empty string.
.. attribute:: Decompress.unconsumed_tail
A string that contains any data that was not consumed by the last
:meth:`decompress` call because it exceeded the limit for the uncompressed data
buffer. This data has not yet been seen by the zlib machinery, so you must feed
it (possibly with further data concatenated to it) back to a subsequent
:meth:`decompress` method call in order to get correct output.
.. method:: Decompress.decompress(string[, max_length])
Decompress *string*, returning a string containing the uncompressed data
corresponding to at least part of the data in *string*. This data should be
concatenated to the output produced by any preceding calls to the
:meth:`decompress` method. Some of the input data may be preserved in internal
buffers for later processing.
If the optional parameter *max_length* is supplied then the return value will be
no longer than *max_length*. This may mean that not all of the compressed input
can be processed; and unconsumed data will be stored in the attribute
:attr:`unconsumed_tail`. This string must be passed to a subsequent call to
:meth:`decompress` if decompression is to continue. If *max_length* is not
supplied then the whole input is decompressed, and :attr:`unconsumed_tail` is an
empty string.
.. method:: Decompress.flush([length])
All pending input is processed, and a string containing the remaining
uncompressed output is returned. After calling :meth:`flush`, the
:meth:`decompress` method cannot be called again; the only realistic action is
to delete the object.
The optional parameter *length* sets the initial size of the output buffer.
.. method:: Decompress.copy()
Returns a copy of the decompression object. This can be used to save the state
of the decompressor midway through the data stream in order to speed up random
seeks into the stream at a future point.
.. versionadded:: 2.5
.. seealso::
Module :mod:`gzip`
Reading and writing :program:`gzip`\ -format files.
http://www.zlib.net
The zlib library home page.
http://www.zlib.net/manual.html
The zlib manual explains the semantics and usage of the library's many
functions.
|
