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import unittest
import zstandard as zstd
class TestDecompressor_decompressobj(unittest.TestCase):
def test_simple(self):
data = zstd.ZstdCompressor(level=1).compress(b"foobar")
dctx = zstd.ZstdDecompressor()
dobj = dctx.decompressobj()
self.assertEqual(dobj.unused_data, b"")
self.assertEqual(dobj.unconsumed_tail, b"")
self.assertFalse(dobj.eof)
self.assertEqual(dobj.decompress(data), b"foobar")
self.assertEqual(dobj.unused_data, b"")
self.assertEqual(dobj.unconsumed_tail, b"")
self.assertTrue(dobj.eof)
self.assertEqual(dobj.flush(), b"")
self.assertEqual(dobj.flush(10), b"")
self.assertEqual(dobj.flush(length=100), b"")
self.assertEqual(dobj.unused_data, b"")
self.assertEqual(dobj.unconsumed_tail, b"")
def test_input_types(self):
compressed = zstd.ZstdCompressor(level=1).compress(b"foo")
dctx = zstd.ZstdDecompressor()
mutable_array = bytearray(len(compressed))
mutable_array[:] = compressed
sources = [
memoryview(compressed),
bytearray(compressed),
mutable_array,
]
for source in sources:
dobj = dctx.decompressobj()
self.assertEqual(dobj.unused_data, b"")
self.assertEqual(dobj.unconsumed_tail, b"")
self.assertFalse(dobj.eof)
self.assertEqual(dobj.flush(), b"")
self.assertEqual(dobj.flush(10), b"")
self.assertEqual(dobj.flush(length=100), b"")
self.assertEqual(dobj.decompress(source), b"foo")
self.assertEqual(dobj.unused_data, b"")
self.assertEqual(dobj.unconsumed_tail, b"")
self.assertTrue(dobj.eof)
self.assertEqual(dobj.flush(), b"")
def test_unused_data(self):
data = zstd.ZstdCompressor(level=1).compress(b"foobar")
dctx = zstd.ZstdDecompressor()
dobj = dctx.decompressobj()
self.assertEqual(dobj.unused_data, b"")
self.assertEqual(dobj.decompress(data + b"extra"), b"foobar")
self.assertTrue(dobj.eof)
self.assertEqual(dobj.unused_data, b"extra")
def test_reuse(self):
data = zstd.ZstdCompressor(level=1).compress(b"foobar")
dctx = zstd.ZstdDecompressor()
dobj = dctx.decompressobj()
dobj.decompress(data)
with self.assertRaisesRegex(
zstd.ZstdError, "cannot use a decompressobj"
):
dobj.decompress(data)
self.assertEqual(dobj.flush(), b"")
def test_multiple_decompress_calls(self):
expected = b"foobar" * 10
data = zstd.ZstdCompressor(level=1).compress(expected)
N = 3
partitioned_data = [
data[len(data) * i // N : len(data) * (i + 1) // N]
for i in range(N)
]
dctx = zstd.ZstdDecompressor()
dobj = dctx.decompressobj()
for partition in partitioned_data[:-1]:
decompressed = dobj.decompress(partition)
self.assertEqual(decompressed, b"")
self.assertEqual(dobj.unused_data, b"")
decompressed = dobj.decompress(partitioned_data[-1])
self.assertEqual(decompressed, expected)
def test_bad_write_size(self):
dctx = zstd.ZstdDecompressor()
with self.assertRaisesRegex(ValueError, "write_size must be positive"):
dctx.decompressobj(write_size=0)
def test_write_size(self):
source = b"foo" * 64 + b"bar" * 128
data = zstd.ZstdCompressor(level=1).compress(source)
dctx = zstd.ZstdDecompressor()
for i in range(128):
dobj = dctx.decompressobj(write_size=i + 1)
self.assertEqual(dobj.decompress(data), source)
def test_multiple_frames_default(self):
cctx = zstd.ZstdCompressor()
foo = cctx.compress(b"foo")
bar = cctx.compress(b"bar")
dctx = zstd.ZstdDecompressor()
dobj = dctx.decompressobj()
self.assertEqual(dobj.decompress(foo + bar), b"foo")
self.assertEqual(dobj.unused_data, bar)
self.assertEqual(dobj.unconsumed_tail, b"")
def test_read_across_frames_false(self):
cctx = zstd.ZstdCompressor()
foo = cctx.compress(b"foo")
bar = cctx.compress(b"bar")
dctx = zstd.ZstdDecompressor()
dobj = dctx.decompressobj(read_across_frames=False)
self.assertEqual(dobj.decompress(foo + bar), b"foo")
self.assertEqual(dobj.unused_data, bar)
self.assertEqual(dobj.unconsumed_tail, b"")
def test_read_across_frames_true(self):
cctx = zstd.ZstdCompressor()
foo = cctx.compress(b"foo")
bar = cctx.compress(b"bar")
dctx = zstd.ZstdDecompressor()
dobj = dctx.decompressobj(read_across_frames=True)
self.assertEqual(dobj.decompress(foo + bar), b"foobar")
self.assertEqual(dobj.unused_data, b"")
self.assertEqual(dobj.unconsumed_tail, b"")
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