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import array
import os
import io
import pickle
import sys
import lz4.frame
import pytest
def test_issue_172_1():
"""Test reproducer for issue 172
Issue 172 is a reported failure occurring on Windows 10 only. This bug was
due to incorrect handling of Py_ssize_t types when doing comparisons and
using them as a size when allocating memory.
"""
input_data = 8 * os.urandom(1024)
with lz4.frame.open('testfile_small', 'wb') as fp:
bytes_written = fp.write(input_data) # noqa: F841
with lz4.frame.open('testfile_small', 'rb') as fp:
data = fp.read(10)
assert len(data) == 10
def test_issue_172_2():
input_data = 9 * os.urandom(1024)
with lz4.frame.open('testfile_small', 'w') as fp:
bytes_written = fp.write(input_data) # noqa: F841
with lz4.frame.open('testfile_small', 'r') as fp:
data = fp.read(10)
assert len(data) == 10
def test_issue_172_3():
input_data = 9 * os.urandom(1024)
with lz4.frame.open('testfile_small', 'wb') as fp:
bytes_written = fp.write(input_data) # noqa: F841
with lz4.frame.open('testfile_small', 'rb') as fp:
data = fp.read(10)
assert len(data) == 10
with lz4.frame.open('testfile_small', 'rb') as fp:
data = fp.read(16 * 1024 - 1)
assert len(data) == 9 * 1024
assert data == input_data
def test_issue_227_1():
q = array.array('Q', [1, 2, 3, 4, 5])
LENGTH = len(q) * q.itemsize
with lz4.frame.open(io.BytesIO(), 'w') as f:
assert f.write(q) == LENGTH
assert f.tell() == LENGTH
@pytest.mark.skipif(
sys.version_info < (3, 8),
reason="PickleBuffer only availiable in Python 3.8 or greater"
)
def test_issue_227_2():
q = array.array('Q', [1, 2, 3, 4, 5])
c = lz4.frame.compress(q)
d = lz4.frame.LZ4FrameDecompressor().decompress(pickle.PickleBuffer(c))
assert memoryview(q).tobytes() == d
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