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import lz4.frame as lz4frame
import pytest
import os
import struct
test_data = [
(os.urandom(256 * 1024)),
]
@pytest.fixture(
params=test_data,
ids=[
'data' + str(i) for i in range(len(test_data))
]
)
def data(request):
return request.param
def test_decompress_truncated(data):
compressed = lz4frame.compress(data)
message = r'^LZ4F_getFrameInfo failed with code: ERROR_frameHeader_incomplete'
with pytest.raises(RuntimeError, match=message):
lz4frame.decompress(compressed[:6])
for i in range(16, len(compressed) - 1, 5): # 15 is the max size of the header
message = r'^Frame incomplete. LZ4F_decompress returned:'
try:
lz4frame.decompress(compressed[:i])
except RuntimeError as r:
print(r)
with pytest.raises(RuntimeError, match=message):
lz4frame.decompress(compressed[:i])
def test_content_checksum_failure(data):
compressed = lz4frame.compress(data, content_checksum=True)
message = r'^LZ4F_decompress failed with code: ERROR_contentChecksum_invalid$'
with pytest.raises(RuntimeError, match=message):
last = struct.unpack('B', compressed[-1:])[0]
lz4frame.decompress(compressed[:-1] + struct.pack('B', last ^ 0x42))
def test_block_checksum_failure(data):
compressed = lz4frame.compress(
data,
content_checksum=True,
block_checksum=True,
return_bytearray=True,
)
message = r'^LZ4F_decompress failed with code: ERROR_blockChecksum_invalid$'
if len(compressed) > 32:
with pytest.raises(RuntimeError, match=message):
compressed[22] = compressed[18] ^ 0x42
lz4frame.decompress(compressed)
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