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
|
""" Testing
"""
from __future__ import division, print_function, absolute_import
import os
import sys
import zlib
from io import BytesIO
if sys.version_info[0] >= 3:
cStringIO = BytesIO
else:
from cStringIO import StringIO as cStringIO
from tempfile import mkstemp
from contextlib import contextmanager
import numpy as np
from numpy.testing import assert_, assert_equal
from pytest import raises as assert_raises
from scipy.io.matlab.streams import (make_stream,
GenericStream, cStringStream, FileStream, ZlibInputStream,
_read_into, _read_string)
IS_PYPY = ('__pypy__' in sys.modules)
@contextmanager
def setup_test_file():
val = b'a\x00string'
fd, fname = mkstemp()
with os.fdopen(fd, 'wb') as fs:
fs.write(val)
with open(fname, 'rb') as fs:
gs = BytesIO(val)
cs = cStringIO(val)
yield fs, gs, cs
os.unlink(fname)
def test_make_stream():
with setup_test_file() as (fs, gs, cs):
# test stream initialization
assert_(isinstance(make_stream(gs), GenericStream))
if sys.version_info[0] < 3 and not IS_PYPY:
assert_(isinstance(make_stream(cs), cStringStream))
assert_(isinstance(make_stream(fs), FileStream))
def test_tell_seek():
with setup_test_file() as (fs, gs, cs):
for s in (fs, gs, cs):
st = make_stream(s)
res = st.seek(0)
assert_equal(res, 0)
assert_equal(st.tell(), 0)
res = st.seek(5)
assert_equal(res, 0)
assert_equal(st.tell(), 5)
res = st.seek(2, 1)
assert_equal(res, 0)
assert_equal(st.tell(), 7)
res = st.seek(-2, 2)
assert_equal(res, 0)
assert_equal(st.tell(), 6)
def test_read():
with setup_test_file() as (fs, gs, cs):
for s in (fs, gs, cs):
st = make_stream(s)
st.seek(0)
res = st.read(-1)
assert_equal(res, b'a\x00string')
st.seek(0)
res = st.read(4)
assert_equal(res, b'a\x00st')
# read into
st.seek(0)
res = _read_into(st, 4)
assert_equal(res, b'a\x00st')
res = _read_into(st, 4)
assert_equal(res, b'ring')
assert_raises(IOError, _read_into, st, 2)
# read alloc
st.seek(0)
res = _read_string(st, 4)
assert_equal(res, b'a\x00st')
res = _read_string(st, 4)
assert_equal(res, b'ring')
assert_raises(IOError, _read_string, st, 2)
class TestZlibInputStream(object):
def _get_data(self, size):
data = np.random.randint(0, 256, size).astype(np.uint8).tostring()
compressed_data = zlib.compress(data)
stream = BytesIO(compressed_data)
return stream, len(compressed_data), data
def test_read(self):
block_size = 131072
SIZES = [0, 1, 10, block_size//2, block_size-1,
block_size, block_size+1, 2*block_size-1]
READ_SIZES = [block_size//2, block_size-1,
block_size, block_size+1]
def check(size, read_size):
compressed_stream, compressed_data_len, data = self._get_data(size)
stream = ZlibInputStream(compressed_stream, compressed_data_len)
data2 = b''
so_far = 0
while True:
block = stream.read(min(read_size,
size - so_far))
if not block:
break
so_far += len(block)
data2 += block
assert_equal(data, data2)
for size in SIZES:
for read_size in READ_SIZES:
check(size, read_size)
def test_read_max_length(self):
size = 1234
data = np.random.randint(0, 256, size).astype(np.uint8).tostring()
compressed_data = zlib.compress(data)
compressed_stream = BytesIO(compressed_data + b"abbacaca")
stream = ZlibInputStream(compressed_stream, len(compressed_data))
stream.read(len(data))
assert_equal(compressed_stream.tell(), len(compressed_data))
assert_raises(IOError, stream.read, 1)
def test_seek(self):
compressed_stream, compressed_data_len, data = self._get_data(1024)
stream = ZlibInputStream(compressed_stream, compressed_data_len)
stream.seek(123)
p = 123
assert_equal(stream.tell(), p)
d1 = stream.read(11)
assert_equal(d1, data[p:p+11])
stream.seek(321, 1)
p = 123+11+321
assert_equal(stream.tell(), p)
d2 = stream.read(21)
assert_equal(d2, data[p:p+21])
stream.seek(641, 0)
p = 641
assert_equal(stream.tell(), p)
d3 = stream.read(11)
assert_equal(d3, data[p:p+11])
assert_raises(IOError, stream.seek, 10, 2)
assert_raises(IOError, stream.seek, -1, 1)
assert_raises(ValueError, stream.seek, 1, 123)
stream.seek(10000, 1)
assert_raises(IOError, stream.read, 12)
def test_all_data_read(self):
compressed_stream, compressed_data_len, data = self._get_data(1024)
stream = ZlibInputStream(compressed_stream, compressed_data_len)
assert_(not stream.all_data_read())
stream.seek(512)
assert_(not stream.all_data_read())
stream.seek(1024)
assert_(stream.all_data_read())
|
