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""" 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
import numpy as np
from numpy.testing import (assert_, assert_equal, assert_raises,
run_module_suite)
from scipy.io.matlab.streams import make_stream, \
GenericStream, cStringStream, FileStream, ZlibInputStream, \
_read_into, _read_string
fs = None
gs = None
cs = None
fname = None
def setup():
val = b'a\x00string'
global fs, gs, cs, fname
fd, fname = mkstemp()
fs = os.fdopen(fd, 'wb')
fs.write(val)
fs.close()
fs = open(fname, 'rb')
gs = BytesIO(val)
cs = cStringIO(val)
def teardown():
global fname, fs
fs.close()
del fs
os.unlink(fname)
def test_make_stream():
global fs, gs, cs
# test stream initialization
assert_(isinstance(make_stream(gs), GenericStream))
if sys.version_info[0] < 3:
assert_(isinstance(make_stream(cs), cStringStream))
assert_(isinstance(make_stream(fs), FileStream))
def test_tell_seek():
global fs, gs, cs
for s in (fs, gs, cs):
st = make_stream(s)
res = st.seek(0)
yield assert_equal, res, 0
yield assert_equal, st.tell(), 0
res = st.seek(5)
yield assert_equal, res, 0
yield assert_equal, st.tell(), 5
res = st.seek(2, 1)
yield assert_equal, res, 0
yield assert_equal, st.tell(), 7
res = st.seek(-2, 2)
yield assert_equal, res, 0
yield assert_equal, st.tell(), 6
def test_read():
global fs, gs, cs
for s in (fs, gs, cs):
st = make_stream(s)
st.seek(0)
res = st.read(-1)
yield assert_equal, res, b'a\x00string'
st.seek(0)
res = st.read(4)
yield assert_equal, res, b'a\x00st'
# read into
st.seek(0)
res = _read_into(st, 4)
yield assert_equal, res, b'a\x00st'
res = _read_into(st, 4)
yield assert_equal, res, b'ring'
yield assert_raises, IOError, _read_into, st, 2
# read alloc
st.seek(0)
res = _read_string(st, 4)
yield assert_equal, res, b'a\x00st'
res = _read_string(st, 4)
yield assert_equal, res, b'ring'
yield 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:
yield 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())
if __name__ == "__main__":
run_module_suite()
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