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""" Testing mio5_utils Cython module
"""
from __future__ import division, print_function, absolute_import
import sys
from io import BytesIO
cStringIO = BytesIO
import numpy as np
from nose.tools import (assert_true, assert_equal, assert_raises)
from numpy.testing import (assert_array_equal, run_module_suite)
from scipy._lib.six import u
import scipy.io.matlab.byteordercodes as boc
import scipy.io.matlab.streams as streams
import scipy.io.matlab.mio5_params as mio5p
import scipy.io.matlab.mio5_utils as m5u
def test_byteswap():
for val in (
1,
0x100,
0x10000):
a = np.array(val, dtype=np.uint32)
b = a.byteswap()
c = m5u.byteswap_u4(a)
assert_equal(b.item(), c)
d = m5u.byteswap_u4(c)
assert_equal(a.item(), d)
def _make_tag(base_dt, val, mdtype, sde=False):
''' Makes a simple matlab tag, full or sde '''
base_dt = np.dtype(base_dt)
bo = boc.to_numpy_code(base_dt.byteorder)
byte_count = base_dt.itemsize
if not sde:
udt = bo + 'u4'
padding = 8 - (byte_count % 8)
all_dt = [('mdtype', udt),
('byte_count', udt),
('val', base_dt)]
if padding:
all_dt.append(('padding', 'u1', padding))
else: # is sde
udt = bo + 'u2'
padding = 4-byte_count
if bo == '<': # little endian
all_dt = [('mdtype', udt),
('byte_count', udt),
('val', base_dt)]
else: # big endian
all_dt = [('byte_count', udt),
('mdtype', udt),
('val', base_dt)]
if padding:
all_dt.append(('padding', 'u1', padding))
tag = np.zeros((1,), dtype=all_dt)
tag['mdtype'] = mdtype
tag['byte_count'] = byte_count
tag['val'] = val
return tag
def _write_stream(stream, *strings):
stream.truncate(0)
stream.seek(0)
for s in strings:
stream.write(s)
stream.seek(0)
def _make_readerlike(stream, byte_order=boc.native_code):
class R(object):
pass
r = R()
r.mat_stream = stream
r.byte_order = byte_order
r.struct_as_record = True
r.uint16_codec = sys.getdefaultencoding()
r.chars_as_strings = False
r.mat_dtype = False
r.squeeze_me = False
return r
def test_read_tag():
# mainly to test errors
# make reader-like thing
str_io = BytesIO()
r = _make_readerlike(str_io)
c_reader = m5u.VarReader5(r)
# This works for StringIO but _not_ cStringIO
assert_raises(IOError, c_reader.read_tag)
# bad SDE
tag = _make_tag('i4', 1, mio5p.miINT32, sde=True)
tag['byte_count'] = 5
_write_stream(str_io, tag.tostring())
assert_raises(ValueError, c_reader.read_tag)
def test_read_stream():
tag = _make_tag('i4', 1, mio5p.miINT32, sde=True)
tag_str = tag.tostring()
str_io = cStringIO(tag_str)
st = streams.make_stream(str_io)
s = streams._read_into(st, tag.itemsize)
assert_equal(s, tag.tostring())
def test_read_numeric():
# make reader-like thing
str_io = cStringIO()
r = _make_readerlike(str_io)
# check simplest of tags
for base_dt, val, mdtype in (('u2', 30, mio5p.miUINT16),
('i4', 1, mio5p.miINT32),
('i2', -1, mio5p.miINT16)):
for byte_code in ('<', '>'):
r.byte_order = byte_code
c_reader = m5u.VarReader5(r)
assert_equal(c_reader.little_endian, byte_code == '<')
assert_equal(c_reader.is_swapped, byte_code != boc.native_code)
for sde_f in (False, True):
dt = np.dtype(base_dt).newbyteorder(byte_code)
a = _make_tag(dt, val, mdtype, sde_f)
a_str = a.tostring()
_write_stream(str_io, a_str)
el = c_reader.read_numeric()
assert_equal(el, val)
# two sequential reads
_write_stream(str_io, a_str, a_str)
el = c_reader.read_numeric()
assert_equal(el, val)
el = c_reader.read_numeric()
assert_equal(el, val)
def test_read_numeric_writeable():
# make reader-like thing
str_io = cStringIO()
r = _make_readerlike(str_io, '<')
c_reader = m5u.VarReader5(r)
dt = np.dtype('<u2')
a = _make_tag(dt, 30, mio5p.miUINT16, 0)
a_str = a.tostring()
_write_stream(str_io, a_str)
el = c_reader.read_numeric()
assert_true(el.flags.writeable)
def test_zero_byte_string():
# Tests hack to allow chars of non-zero length, but 0 bytes
# make reader-like thing
str_io = cStringIO()
r = _make_readerlike(str_io, boc.native_code)
c_reader = m5u.VarReader5(r)
tag_dt = np.dtype([('mdtype', 'u4'), ('byte_count', 'u4')])
tag = np.zeros((1,), dtype=tag_dt)
tag['mdtype'] = mio5p.miINT8
tag['byte_count'] = 1
hdr = m5u.VarHeader5()
# Try when string is 1 length
hdr.set_dims([1,])
_write_stream(str_io, tag.tostring() + b' ')
str_io.seek(0)
val = c_reader.read_char(hdr)
assert_equal(val, u(' '))
# Now when string has 0 bytes 1 length
tag['byte_count'] = 0
_write_stream(str_io, tag.tostring())
str_io.seek(0)
val = c_reader.read_char(hdr)
assert_equal(val, u(' '))
# Now when string has 0 bytes 4 length
str_io.seek(0)
hdr.set_dims([4,])
val = c_reader.read_char(hdr)
assert_array_equal(val, [u(' ')] * 4)
if __name__ == "__main__":
run_module_suite()
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