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#!/usr/bin/env python
# coding: utf-8
#
# Project: FabIO tests class utilities
#
# Copyright (C) 2010-2016 European Synchrotron Radiation Facility
# Grenoble, France
#
# Principal authors: Jérôme KIEFFER (jerome.kieffer@esrf.fr)
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
__author__ = "Jérôme Kieffer"
__contact__ = "jerome.kieffer@esrf.eu"
__license__ = "MIT"
__copyright__ = "European Synchrotron Radiation Facility, Grenoble, France"
__date__ = "13/11/2020"
import io
import logging
import unittest
from struct import pack
import numpy as np
from ..compression import agi_bitfield
from ..ext import _agi_bitfield
logger = logging.getLogger(__name__)
class TestUtil(unittest.TestCase):
def test_get_fieldsize(self):
test_cases = [
(np.zeros(8, dtype="int32"), 1),
(np.array([1024] * 8, dtype="int32"), 8),
(np.arange(0, 7, dtype="int32"), 4),
(np.array([-1, -2, 2, 1] * 2, dtype="int32"), 3),
(np.array([-3, 3, 8, 3, -5 - 5, 0, 6]), 5)
]
for array, result in test_cases:
fs = agi_bitfield.get_fieldsize(array)
self.assertEqual(result, fs)
fs = _agi_bitfield.get_fieldsize(array)
self.assertEqual(result, fs)
def test_compress_decode_field_overflow(self):
data = np.array([1, 2, 3, 4, 255, 40000, -4, 2], dtype="int32")
fs = agi_bitfield.get_fieldsize(data)
oft = io.BytesIO()
cf = agi_bitfield.compress_field(data, fs, oft)
self.assertEqual(pack("h", 255) + pack("i", 40000), oft.getvalue())
mask_ = agi_bitfield.MASK[fs]
dec = agi_bitfield.decode_field(cf)
self.assertEqual([1 + 127, 2 + 127, 3 + 127, 4 + 127, 0xfe & mask_, 0xff & mask_, -4 + 127, 2 + 127], dec)
def test_compress_decompress_field_small(self):
data = np.array([1, 0] * 4, dtype="int32")
fs = agi_bitfield.get_fieldsize(data)
oft = io.BytesIO()
cf = agi_bitfield.compress_field(data, fs, oft)
self.assertEqual(b'', oft.getvalue())
conv_ = agi_bitfield.MASK[fs - 1]
dec = agi_bitfield.decode_field(cf[:fs])
self.assertEqual([1 + conv_, 0 + conv_] * 4, dec)
def test_full_compress_decompress_field(self):
data = np.array([1, 2, 3, 4, 255, -40000, -4, 2], dtype="int32")
fs = agi_bitfield.get_fieldsize(data)
oft = io.BytesIO()
cf = agi_bitfield.compress_field(data, fs, oft)
oft = io.BytesIO(oft.getvalue()) # do this to simulate actual conditions. the data is passed between
# encoding and decoding as bytes so the index would not be preserved
field = agi_bitfield.decode_field(cf[:fs])
agi_bitfield.undo_escapes(field, fs, oft)
self.assertEqual(list(data), field)
def test_mask_conv(self):
mask_cases = [
(1, 1),
(4, 0b1111),
(8, 0xff)
]
for length, msk in mask_cases:
self.assertEqual(msk, agi_bitfield.MASK[length])
conv_cases = [
(1, 0),
(4, 0b111),
(8, 0b1111111)
]
for length, cnv in conv_cases:
self.assertEqual(cnv, agi_bitfield.MASK[length - 1])
class TestRow(unittest.TestCase):
def test_compress_row_zero(self):
data = np.zeros(256, dtype="int32")
buffer = io.BytesIO()
buffer_python = io.BytesIO()
buffer_cython = io.BytesIO()
_agi_bitfield.compress_row(data, buffer_cython)
agi_bitfield.compress_row(data, buffer_python)
self.assertEqual(buffer_cython.getbuffer(), buffer_python.getbuffer(), "compressed string matches")
_agi_bitfield.compress_row(data, buffer)
buffer.seek(0)
decompressed = agi_bitfield.decompress_row(buffer, 256)
decompressed = np.array(decompressed, dtype="int32").cumsum()
self.assertTrue(np.array_equal(decompressed, data))
def test_compress_row_small(self):
data = np.random.randint(0, 5, 256, dtype="int32")
buffer = io.BytesIO()
buffer_python = io.BytesIO()
buffer_cython = io.BytesIO()
_agi_bitfield.compress_row(data, buffer_cython)
agi_bitfield.compress_row(data, buffer_python)
self.assertEqual(buffer_cython.getbuffer(), buffer_python.getbuffer(), "compressed string matches")
_agi_bitfield.compress_row(data, buffer)
buffer.seek(0)
decompressed = agi_bitfield.decompress_row(buffer, 256)
decompressed = np.array(decompressed, dtype="int32").cumsum()
self.assertTrue(np.array_equal(decompressed, data))
def compress_row_overflows(self):
data = np.random.randint(-255, 255, 256, dtype="int32")
buffer = io.BytesIO()
buffer_python = io.BytesIO()
buffer_cython = io.BytesIO()
_agi_bitfield.compress_row(data, buffer_cython)
agi_bitfield.compress_row(data, buffer_python)
self.assertEqual(buffer_cython.getbuffer(), buffer_python.getbuffer(), "compressed string matches")
_agi_bitfield.compress_row(data, buffer)
buffer.seek(0)
decompressed = agi_bitfield.decompress_row(buffer, 256)
decompressed = np.array(decompressed, dtype="int32").cumsum()
self.assertTrue(np.array_equal(decompressed, data))
class TestCompression(unittest.TestCase):
def test_full_rand(self):
data = np.random.randint(-256, 500, (256, 256)).astype("int32")
import time
t0 = time.perf_counter()
compressed = agi_bitfield.compress(data)
t1 = time.perf_counter()
uncompressed = agi_bitfield.decompress(compressed, data.shape)
self.assertTrue(np.array_equal(data, uncompressed), "Python version is OK")
t2 = time.perf_counter()
compressed = _agi_bitfield.compress(data)
t3 = time.perf_counter()
uncompressed = agi_bitfield.decompress(compressed, data.shape)
self.assertTrue(np.array_equal(data, uncompressed), "Cython version is OK")
print("speed-up:", (t1 - t0) / (t3 - t2))
def suite():
loadTests = unittest.defaultTestLoader.loadTestsFromTestCase
testsuite = unittest.TestSuite()
testsuite.addTest(loadTests(TestUtil))
testsuite.addTest(loadTests(TestRow))
testsuite.addTest(loadTests(TestCompression))
return testsuite
if __name__ == '__main__':
runner = unittest.TextTestRunner()
runner.run(suite())
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