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# -*- coding: utf-8 -*-
"""
test_simple_compression
~~~~~~~~~~~~~~~~~~~~~~~~~
Tests for compression of single chunks.
"""
import brotlicffi
import pytest
from hypothesis import given, settings
from hypothesis.strategies import binary, integers, sampled_from, one_of
def test_roundtrip_compression_with_files(simple_compressed_file):
"""
Roundtripping data through the compressor works correctly.
"""
with open(simple_compressed_file[0], 'rb') as f:
uncompressed_data = f.read()
assert brotlicffi.decompress(
brotlicffi.compress(uncompressed_data)
) == uncompressed_data
@pytest.mark.slow
@settings(deadline=None)
@given(
chunk_size=integers(min_value=1, max_value=2**12),
mode=sampled_from(list(brotlicffi.BrotliEncoderMode)),
quality=integers(min_value=0, max_value=11),
lgwin=integers(min_value=10, max_value=24),
lgblock=one_of(
integers(min_value=0, max_value=0),
integers(min_value=16, max_value=24)
),
)
def test_streaming_compression(one_compressed_file,
chunk_size,
mode,
quality,
lgwin,
lgblock):
"""
Confirm that the streaming compressor works as expected.
"""
compressed_chunks = []
c = brotlicffi.Compressor(
mode=mode, quality=quality, lgwin=lgwin, lgblock=lgblock
)
with open(one_compressed_file, 'rb') as f:
while True:
next_data = f.read(chunk_size)
if not next_data:
break
compressed_chunks.append(c.compress(next_data))
compressed_chunks.append(c.finish())
decompressed = brotlicffi.decompress(b''.join(compressed_chunks))
with open(one_compressed_file, 'rb') as f:
assert decompressed == f.read()
@pytest.mark.slow
@settings(deadline=None)
@given(
chunk_size=integers(min_value=1, max_value=2**12),
mode=sampled_from(list(brotlicffi.BrotliEncoderMode)),
quality=integers(min_value=0, max_value=11),
lgwin=integers(min_value=10, max_value=24),
lgblock=one_of(
integers(min_value=0, max_value=0),
integers(min_value=16, max_value=24)
),
)
def test_streaming_compression_flush(one_compressed_file,
chunk_size,
mode,
quality,
lgwin,
lgblock):
"""
Confirm that the streaming compressor works as expected, including flushes
after each chunk.
"""
compressed_chunks = []
c = brotlicffi.Compressor(
mode=mode, quality=quality, lgwin=lgwin, lgblock=lgblock
)
with open(one_compressed_file, 'rb') as f:
while True:
next_data = f.read(chunk_size)
if not next_data:
break
compressed_chunks.append(c.compress(next_data))
compressed_chunks.append(c.flush())
compressed_chunks.append(c.finish())
decompressed = brotlicffi.decompress(b''.join(compressed_chunks))
with open(one_compressed_file, 'rb') as f:
assert decompressed == f.read()
@given(binary())
def test_compressed_data_roundtrips(s):
assert brotlicffi.decompress(brotlicffi.compress(s)) == s
@given(binary())
def test_process_alias(s):
c1 = brotlicffi.Compressor()
c2 = brotlicffi.Compressor()
d1 = brotlicffi.Decompressor()
d2 = brotlicffi.Decompressor()
s1 = c1.compress(s) + c1.finish()
s2 = c2.process(s) + c2.finish()
assert (
(d1.decompress(s1) + d1.finish())
== (d2.process(s2) + d2.finish())
== s
)
@pytest.mark.parametrize(
"params",
[
{"mode": 52},
{"quality": 52},
{"lgwin": 52},
{"lgblock": 52},
]
)
def test_bad_compressor_parameters(params):
with pytest.raises(brotlicffi.error):
brotlicffi.Compressor(**params)
|
