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test_compress2.py
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163 lines (138 loc) · 5.13 KB
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#######################################################################
# Copyright (c) 2019-present, Blosc Development Team <blosc@blosc.org>
# All rights reserved.
#
# This source code is licensed under a BSD-style license (found in the
# LICENSE file in the root directory of this source tree)
#######################################################################
import numpy as np
import pytest
import blosc2
random = np.random.default_rng()
@pytest.mark.parametrize("gil", [True, False])
@pytest.mark.parametrize(
("obj", "cparams", "dparams"),
[
(random.integers(0, 10, 10), {"cparams": blosc2.CParams(codec=blosc2.Codec.LZ4, clevel=6)}, {}),
(
np.arange(10, dtype="float32"),
# Select an absolute precision of 10 bits in mantissa
{
"cparams": blosc2.CParams(
filters=[blosc2.Filter.TRUNC_PREC, blosc2.Filter.BITSHUFFLE],
filters_meta=[10, 0],
typesize=4,
)
},
{"dparams": blosc2.DParams(nthreads=4)},
),
(
np.arange(10, dtype="float32"),
# Do a reduction of precision of 10 bits in mantissa
{
"cparams": {
"filters": [blosc2.Filter.TRUNC_PREC, blosc2.Filter.BITSHUFFLE],
"filters_meta": [-10, 0],
"typesize": 4,
},
},
{"nthreads": 4},
),
(
random.integers(0, 1000, 1000, endpoint=True),
{"cparams": blosc2.CParams(splitmode=blosc2.SplitMode.ALWAYS_SPLIT, nthreads=5, typesize=4)},
{"dparams": blosc2.DParams()},
),
(
np.arange(45, dtype=np.float64),
{"cparams": blosc2.CParams(codec=blosc2.Codec.LZ4HC, typesize=4)},
{},
),
(np.arange(50, dtype=np.int64), {"typesize": 4}, {"dparams": blosc2.dparams_dflts}),
],
)
def test_compress2_numpy(obj, cparams, dparams, gil):
blosc2.set_releasegil(gil)
bytes_obj = obj.tobytes()
c = blosc2.compress2(obj, **cparams)
dest = bytearray(obj)
blosc2.decompress2(c, dst=dest, **dparams)
assert dest == bytes_obj
dest2 = np.empty(obj.shape, obj.dtype)
blosc2.decompress2(c, dst=dest2, **dparams)
assert np.array_equal(dest2, obj)
dest3 = blosc2.decompress2(c, **dparams)
assert dest3 == bytes_obj
dest4 = np.empty(obj.shape, obj.dtype)
blosc2.decompress2(c, dst=memoryview(dest4), **dparams)
assert np.array_equal(dest4, obj)
@pytest.mark.parametrize("gil", [True, False])
@pytest.mark.parametrize(
("obj", "cparams", "dparams"),
[
(
random.integers(0, 10, 10, dtype=np.int64),
{"codec": blosc2.Codec.LZ4, "clevel": 6, "filters_meta": [-50]},
{},
),
(
np.arange(10, dtype="int32"),
{"filters_meta": [-20]},
{"nthreads": 4},
),
(np.arange(45, dtype=np.int16), {"codec": blosc2.Codec.LZ4HC, "filters_meta": [-10]}, {}),
(np.arange(50, dtype=np.int8), {"filters_meta": [-5]}, blosc2.dparams_dflts),
],
)
def test_compress2_int_trunc(obj, cparams, dparams, gil):
blosc2.set_releasegil(gil)
cparams["filters"] = [blosc2.Filter.INT_TRUNC]
cparams["typesize"] = obj.dtype.itemsize
c = blosc2.compress2(obj, **cparams)
dest = np.empty(obj.shape, obj.dtype)
blosc2.decompress2(c, dst=dest, **dparams)
for i in range(obj.shape[0]):
assert (obj[i] - dest[i]) <= (2 ** ((-1) * cparams["filters_meta"][0]))
@pytest.mark.parametrize("gil", [True, False])
@pytest.mark.parametrize(
("nbytes", "cparams", "dparams"),
[
(7, {"codec": blosc2.Codec.LZ4, "clevel": 6, "typesize": 1}, {}),
(641091, {"typesize": 1}, {"nthreads": 4}),
(136, {"typesize": 1}, {}),
(1231, {"typesize": 4}, blosc2.dparams_dflts),
],
)
def test_compress2(nbytes, cparams, dparams, gil):
blosc2.set_releasegil(gil)
bytes_obj = b" " * nbytes
c = blosc2.compress2(bytes_obj, **cparams)
dest = bytearray(bytes_obj)
blosc2.decompress2(c, dst=dest, **dparams)
assert dest == bytes_obj
dest2 = blosc2.decompress2(c, **dparams)
assert dest2 == bytes_obj
dest3 = bytearray(bytes_obj)
blosc2.decompress2(np.array([c]), dst=dest3, **dparams)
assert dest3 == bytes_obj
@pytest.mark.parametrize("gil", [True, False])
@pytest.mark.parametrize(
("object", "cparams", "dparams"),
[(np.arange(0), {"codec": blosc2.Codec.LZ4, "clevel": 6}, {}), (b"", {}, {"nthreads": 3})],
)
def test_raise_error(object, cparams, dparams, gil):
blosc2.set_releasegil(gil)
c = blosc2.compress2(object, **cparams, **dparams)
dest = bytearray(object)
with pytest.raises(ValueError):
blosc2.decompress2(c, dst=dest)
dest3 = blosc2.decompress2(c)
if isinstance(object, bytes):
assert dest3 == object
else:
assert dest3 == object.tobytes()
dest5 = bytearray(object)
with pytest.raises(ValueError):
blosc2.decompress2(np.array([c]), dst=dest5)
with pytest.raises(ValueError):
blosc2.decompress2(b"")