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import struct
import unittest
import zstandard as zstd
@unittest.skipUnless(
"multi_compress_to_buffer" in zstd.backend_features,
"multi_compress_to_buffer feature not available",
)
class TestCompressor_multi_compress_to_buffer(unittest.TestCase):
def test_invalid_inputs(self):
cctx = zstd.ZstdCompressor()
with self.assertRaises(TypeError):
cctx.multi_compress_to_buffer(True)
with self.assertRaises(TypeError):
cctx.multi_compress_to_buffer((1, 2))
with self.assertRaisesRegex(
TypeError, "item 0 not a bytes like object"
):
cctx.multi_compress_to_buffer(["foo"])
def test_empty_input(self):
cctx = zstd.ZstdCompressor()
with self.assertRaisesRegex(ValueError, "no source elements found"):
cctx.multi_compress_to_buffer([])
with self.assertRaisesRegex(ValueError, "source elements are empty"):
cctx.multi_compress_to_buffer([b"", b"", b""])
def test_list_input(self):
cctx = zstd.ZstdCompressor(write_checksum=True)
original = [b"foo" * 12, b"bar" * 6]
frames = [cctx.compress(c) for c in original]
b = cctx.multi_compress_to_buffer(original)
self.assertIsInstance(b, zstd.BufferWithSegmentsCollection)
self.assertEqual(len(b), 2)
self.assertEqual(b.size(), 44)
self.assertEqual(b[0].tobytes(), frames[0])
self.assertEqual(b[1].tobytes(), frames[1])
def test_buffer_with_segments_input(self):
cctx = zstd.ZstdCompressor(write_checksum=True)
original = [b"foo" * 4, b"bar" * 6]
frames = [cctx.compress(c) for c in original]
offsets = struct.pack(
"=QQQQ", 0, len(original[0]), len(original[0]), len(original[1])
)
segments = zstd.BufferWithSegments(b"".join(original), offsets)
result = cctx.multi_compress_to_buffer(segments)
self.assertEqual(len(result), 2)
self.assertEqual(result.size(), 47)
self.assertEqual(result[0].tobytes(), frames[0])
self.assertEqual(result[1].tobytes(), frames[1])
def test_buffer_with_segments_collection_input(self):
cctx = zstd.ZstdCompressor(write_checksum=True)
original = [
b"foo1",
b"foo2" * 2,
b"foo3" * 3,
b"foo4" * 4,
b"foo5" * 5,
]
frames = [cctx.compress(c) for c in original]
b = b"".join([original[0], original[1]])
b1 = zstd.BufferWithSegments(
b,
struct.pack(
"=QQQQ", 0, len(original[0]), len(original[0]), len(original[1])
),
)
b = b"".join([original[2], original[3], original[4]])
b2 = zstd.BufferWithSegments(
b,
struct.pack(
"=QQQQQQ",
0,
len(original[2]),
len(original[2]),
len(original[3]),
len(original[2]) + len(original[3]),
len(original[4]),
),
)
c = zstd.BufferWithSegmentsCollection(b1, b2)
result = cctx.multi_compress_to_buffer(c)
self.assertEqual(len(result), len(frames))
for i, frame in enumerate(frames):
self.assertEqual(result[i].tobytes(), frame)
def test_multiple_threads(self):
# threads argument will cause multi-threaded ZSTD APIs to be used, which will
# make output different.
refcctx = zstd.ZstdCompressor(write_checksum=True)
reference = [refcctx.compress(b"x" * 64), refcctx.compress(b"y" * 64)]
cctx = zstd.ZstdCompressor(write_checksum=True)
frames = []
frames.extend(b"x" * 64 for i in range(256))
frames.extend(b"y" * 64 for i in range(256))
result = cctx.multi_compress_to_buffer(frames, threads=-1)
self.assertEqual(len(result), 512)
for i in range(512):
if i < 256:
self.assertEqual(result[i].tobytes(), reference[0])
else:
self.assertEqual(result[i].tobytes(), reference[1])
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