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import unittest
import zstandard as zstd
class TestCompressor_chunker(unittest.TestCase):
def test_empty(self):
cctx = zstd.ZstdCompressor(write_content_size=False)
chunker = cctx.chunker()
it = chunker.compress(b"")
with self.assertRaises(StopIteration):
next(it)
it = chunker.finish()
self.assertEqual(next(it), b"\x28\xb5\x2f\xfd\x00\x00\x01\x00\x00")
with self.assertRaises(StopIteration):
next(it)
def test_simple_input(self):
cctx = zstd.ZstdCompressor()
chunker = cctx.chunker()
it = chunker.compress(b"foobar")
with self.assertRaises(StopIteration):
next(it)
it = chunker.compress(b"baz" * 30)
with self.assertRaises(StopIteration):
next(it)
it = chunker.finish()
self.assertEqual(
next(it),
b"\x28\xb5\x2f\xfd\x00\x58\x7d\x00\x00\x48\x66\x6f"
b"\x6f\x62\x61\x72\x62\x61\x7a\x01\x00\xe4\xe4\x8e",
)
with self.assertRaises(StopIteration):
next(it)
def test_input_size(self):
cctx = zstd.ZstdCompressor()
chunker = cctx.chunker(size=1024)
it = chunker.compress(b"x" * 1000)
with self.assertRaises(StopIteration):
next(it)
it = chunker.compress(b"y" * 24)
with self.assertRaises(StopIteration):
next(it)
chunks = list(chunker.finish())
self.assertEqual(
chunks,
[
b"\x28\xb5\x2f\xfd\x60\x00\x03\x65\x00\x00\x18\x78\x78\x79\x02\x00"
b"\xa0\x16\xe3\x2b\x80\x05"
],
)
dctx = zstd.ZstdDecompressor()
self.assertEqual(
dctx.decompress(b"".join(chunks)), (b"x" * 1000) + (b"y" * 24)
)
def test_small_chunk_size(self):
cctx = zstd.ZstdCompressor()
chunker = cctx.chunker(chunk_size=1)
chunks = list(chunker.compress(b"foo" * 1024))
self.assertEqual(chunks, [])
chunks = list(chunker.finish())
self.assertTrue(all(len(chunk) == 1 for chunk in chunks))
self.assertEqual(
b"".join(chunks),
b"\x28\xb5\x2f\xfd\x00\x58\x55\x00\x00\x18\x66\x6f\x6f\x01\x00"
b"\xfa\xd3\x77\x43",
)
dctx = zstd.ZstdDecompressor()
self.assertEqual(
dctx.decompress(b"".join(chunks), max_output_size=10000),
b"foo" * 1024,
)
def test_input_types(self):
cctx = zstd.ZstdCompressor()
mutable_array = bytearray(3)
mutable_array[:] = b"foo"
sources = [
memoryview(b"foo"),
bytearray(b"foo"),
mutable_array,
]
for source in sources:
chunker = cctx.chunker()
self.assertEqual(list(chunker.compress(source)), [])
self.assertEqual(
list(chunker.finish()),
[b"\x28\xb5\x2f\xfd\x00\x58\x19\x00\x00\x66\x6f\x6f"],
)
def test_flush(self):
cctx = zstd.ZstdCompressor()
chunker = cctx.chunker()
self.assertEqual(list(chunker.compress(b"foo" * 1024)), [])
self.assertEqual(list(chunker.compress(b"bar" * 1024)), [])
chunks1 = list(chunker.flush())
self.assertEqual(
chunks1,
[
b"\x28\xb5\x2f\xfd\x00\x58\x8c\x00\x00\x30\x66\x6f\x6f\x62\x61\x72"
b"\x02\x00\xfa\x03\xfe\xd0\x9f\xbe\x1b\x02"
],
)
self.assertEqual(list(chunker.flush()), [])
self.assertEqual(list(chunker.flush()), [])
self.assertEqual(list(chunker.compress(b"baz" * 1024)), [])
chunks2 = list(chunker.flush())
self.assertEqual(len(chunks2), 1)
chunks3 = list(chunker.finish())
self.assertEqual(len(chunks2), 1)
dctx = zstd.ZstdDecompressor()
self.assertEqual(
dctx.decompress(
b"".join(chunks1 + chunks2 + chunks3), max_output_size=10000
),
(b"foo" * 1024) + (b"bar" * 1024) + (b"baz" * 1024),
)
def test_compress_after_finish(self):
cctx = zstd.ZstdCompressor()
chunker = cctx.chunker()
list(chunker.compress(b"foo"))
list(chunker.finish())
with self.assertRaisesRegex(
zstd.ZstdError,
r"cannot call compress\(\) after compression finished",
):
list(chunker.compress(b"foo"))
def test_flush_after_finish(self):
cctx = zstd.ZstdCompressor()
chunker = cctx.chunker()
list(chunker.compress(b"foo"))
list(chunker.finish())
with self.assertRaisesRegex(
zstd.ZstdError, r"cannot call flush\(\) after compression finished"
):
list(chunker.flush())
def test_finish_after_finish(self):
cctx = zstd.ZstdCompressor()
chunker = cctx.chunker()
list(chunker.compress(b"foo"))
list(chunker.finish())
with self.assertRaisesRegex(
zstd.ZstdError, r"cannot call finish\(\) after compression finished"
):
list(chunker.finish())
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