def test_multithreaded_unsupported(self):
samples = []
for i in range(128):
samples.append(b'foo' * 64)
samples.append(b'bar' * 64)
d = zstd.train_dictionary(8192, samples)
cctx = zstd.ZstdCompressor(dict_data=d, threads=2)
with self.assertRaisesRegexp(
zstd.ZstdError,
'compress\(\) cannot be used with both dictionaries and multi-threaded compression'
):
cctx.compress(b'foo')
params = zstd.get_compression_parameters(3)
cctx = zstd.ZstdCompressor(compression_params=params, threads=2)
with self.assertRaisesRegexp(
zstd.ZstdError,
'compress\(\) cannot be used with both compression parameters and multi-threaded compression'
):
cctx.compress(b'foo')
def test_get_compression_parameters(self):
p = zstd.get_compression_parameters(1)
self.assertIsInstance(p, zstd.CompressionParameters)
self.assertEqual(p.window_log, 19)
def test_compression_size(self):
params = zstd.get_compression_parameters(3)
size = zstd.estimate_compression_context_size(params)
self.assertGreater(size, 100000)
def multithreaded_chunk_size(level, source_size=0):
params = zstd.get_compression_parameters(level, source_size)
return 1 << (params.window_log + 2)