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
224
225
226
|
import zlib
import sys
import imp
from test.test_support import TestFailed
try:
t = imp.find_module('test_zlib')
file = t[0]
except ImportError:
file = open(__file__)
buf = file.read() * 8
file.close()
# test the checksums (hex so the test doesn't break on 64-bit machines)
print hex(zlib.crc32('penguin')), hex(zlib.crc32('penguin', 1))
print hex(zlib.adler32('penguin')), hex(zlib.adler32('penguin', 1))
# make sure we generate some expected errors
try:
zlib.compress('ERROR', zlib.MAX_WBITS + 1)
except zlib.error, msg:
print "expecting", msg
try:
zlib.compressobj(1, 8, 0)
except ValueError, msg:
print "expecting", msg
try:
zlib.decompressobj(0)
except ValueError, msg:
print "expecting", msg
x = zlib.compress(buf)
y = zlib.decompress(x)
if buf != y:
print "normal compression/decompression failed"
else:
print "normal compression/decompression succeeded"
buf = buf * 16
co = zlib.compressobj(8, 8, -15)
x1 = co.compress(buf)
x2 = co.flush()
try:
co.flush()
print "Oops - second flush worked when it should not have!"
except zlib.error:
pass
x = x1 + x2
dc = zlib.decompressobj(-15)
y1 = dc.decompress(x)
y2 = dc.flush()
y = y1 + y2
if buf != y:
print "compress/decompression obj failed"
else:
print "compress/decompression obj succeeded"
co = zlib.compressobj(2, 8, -12, 9, 1)
bufs = []
for i in range(0, len(buf), 256):
bufs.append(co.compress(buf[i:i+256]))
bufs.append(co.flush())
combuf = ''.join(bufs)
decomp1 = zlib.decompress(combuf, -12, -5)
if decomp1 != buf:
print "decompress with init options failed"
else:
print "decompress with init options succeeded"
deco = zlib.decompressobj(-12)
bufs = []
for i in range(0, len(combuf), 128):
bufs.append(deco.decompress(combuf[i:i+128]))
bufs.append(deco.flush())
decomp2 = ''.join(bufs)
if decomp2 != buf:
print "decompressobj with init options failed"
else:
print "decompressobj with init options succeeded"
print "should be '':", `deco.unconsumed_tail`
# Check a decompression object with max_length specified
deco = zlib.decompressobj(-12)
cb = combuf
bufs = []
while cb:
max_length = 1 + len(cb)/10
chunk = deco.decompress(cb, max_length)
if len(chunk) > max_length:
print 'chunk too big (%d>%d)' % (len(chunk),max_length)
bufs.append(chunk)
cb = deco.unconsumed_tail
bufs.append(deco.flush())
decomp2 = ''.join(buf)
if decomp2 != buf:
print "max_length decompressobj failed"
else:
print "max_length decompressobj succeeded"
# Misc tests of max_length
deco = zlib.decompressobj(-12)
try:
deco.decompress("", -1)
except ValueError:
pass
else:
print "failed to raise value error on bad max_length"
print "unconsumed_tail should be '':", `deco.unconsumed_tail`
# Test flush() with the various options, using all the different levels
# in order to provide more variations.
sync_opt = ['Z_NO_FLUSH', 'Z_SYNC_FLUSH', 'Z_FULL_FLUSH']
sync_opt = [getattr(zlib, opt) for opt in sync_opt if hasattr(zlib, opt)]
for sync in sync_opt:
for level in range(10):
obj = zlib.compressobj( level )
d = obj.compress( buf[:3000] )
d = d + obj.flush( sync )
d = d + obj.compress( buf[3000:] )
d = d + obj.flush()
if zlib.decompress(d) != buf:
print "Decompress failed: flush mode=%i, level=%i" % (sync,level)
del obj
# Test for the odd flushing bugs noted in 2.0, and hopefully fixed in 2.1
import random
random.seed(1)
print 'Testing on 17K of random data'
if hasattr(zlib, 'Z_SYNC_FLUSH'):
# Create compressor and decompressor objects
c=zlib.compressobj(9)
d=zlib.decompressobj()
# Try 17K of data
# generate random data stream
a=""
for i in range(17*1024):
a=a+chr(random.randint(0,255))
# compress, sync-flush, and decompress
t = d.decompress( c.compress(a)+c.flush(zlib.Z_SYNC_FLUSH) )
# if decompressed data is different from the input data, choke.
if len(t) != len(a):
print len(a),len(t),len(d.unused_data)
raise TestFailed, "output of 17K doesn't match"
def ignore():
"""An empty function with a big string.
Make the compression algorithm work a little harder.
"""
"""
LAERTES
O, fear me not.
I stay too long: but here my father comes.
Enter POLONIUS
A double blessing is a double grace,
Occasion smiles upon a second leave.
LORD POLONIUS
Yet here, Laertes! aboard, aboard, for shame!
The wind sits in the shoulder of your sail,
And you are stay'd for. There; my blessing with thee!
And these few precepts in thy memory
See thou character. Give thy thoughts no tongue,
Nor any unproportioned thought his act.
Be thou familiar, but by no means vulgar.
Those friends thou hast, and their adoption tried,
Grapple them to thy soul with hoops of steel;
But do not dull thy palm with entertainment
Of each new-hatch'd, unfledged comrade. Beware
Of entrance to a quarrel, but being in,
Bear't that the opposed may beware of thee.
Give every man thy ear, but few thy voice;
Take each man's censure, but reserve thy judgment.
Costly thy habit as thy purse can buy,
But not express'd in fancy; rich, not gaudy;
For the apparel oft proclaims the man,
And they in France of the best rank and station
Are of a most select and generous chief in that.
Neither a borrower nor a lender be;
For loan oft loses both itself and friend,
And borrowing dulls the edge of husbandry.
This above all: to thine ownself be true,
And it must follow, as the night the day,
Thou canst not then be false to any man.
Farewell: my blessing season this in thee!
LAERTES
Most humbly do I take my leave, my lord.
LORD POLONIUS
The time invites you; go; your servants tend.
LAERTES
Farewell, Ophelia; and remember well
What I have said to you.
OPHELIA
'Tis in my memory lock'd,
And you yourself shall keep the key of it.
LAERTES
Farewell.
"""
|
