1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
import io
import unittest
import zstandard as zstd
from .common import (
CustomBytesIO,
)
class TestCompressor_read_to_iter(unittest.TestCase):
def test_type_validation(self):
cctx = zstd.ZstdCompressor()
# Object with read() works.
for chunk in cctx.read_to_iter(io.BytesIO()):
pass
# Buffer protocol works.
for chunk in cctx.read_to_iter(b"foobar"):
pass
with self.assertRaisesRegex(
ValueError, "must pass an object with a read"
):
for chunk in cctx.read_to_iter(True):
pass
def test_read_empty(self):
cctx = zstd.ZstdCompressor(level=1, write_content_size=False)
source = io.BytesIO()
it = cctx.read_to_iter(source)
chunks = list(it)
self.assertEqual(len(chunks), 1)
compressed = b"".join(chunks)
self.assertEqual(compressed, b"\x28\xb5\x2f\xfd\x00\x00\x01\x00\x00")
# And again with the buffer protocol.
it = cctx.read_to_iter(b"")
chunks = list(it)
self.assertEqual(len(chunks), 1)
compressed2 = b"".join(chunks)
self.assertEqual(compressed2, compressed)
def test_read_large(self):
cctx = zstd.ZstdCompressor(level=1, write_content_size=False)
source = io.BytesIO()
source.write(b"f" * zstd.COMPRESSION_RECOMMENDED_INPUT_SIZE)
source.write(b"o")
source.seek(0)
# Creating an iterator should not perform any compression until
# first read.
it = cctx.read_to_iter(source, size=len(source.getvalue()))
self.assertEqual(source.tell(), 0)
# We should have exactly 2 output chunks.
chunks = []
chunk = next(it)
self.assertIsNotNone(chunk)
self.assertEqual(source.tell(), zstd.COMPRESSION_RECOMMENDED_INPUT_SIZE)
chunks.append(chunk)
chunk = next(it)
self.assertIsNotNone(chunk)
chunks.append(chunk)
self.assertEqual(source.tell(), len(source.getvalue()))
with self.assertRaises(StopIteration):
next(it)
# And again for good measure.
with self.assertRaises(StopIteration):
next(it)
# We should get the same output as the one-shot compression mechanism.
self.assertEqual(b"".join(chunks), cctx.compress(source.getvalue()))
params = zstd.get_frame_parameters(b"".join(chunks))
self.assertEqual(params.content_size, zstd.CONTENTSIZE_UNKNOWN)
self.assertEqual(params.window_size, 262144)
self.assertEqual(params.dict_id, 0)
self.assertFalse(params.has_checksum)
# Now check the buffer protocol.
it = cctx.read_to_iter(source.getvalue())
chunks = list(it)
self.assertEqual(len(chunks), 2)
params = zstd.get_frame_parameters(b"".join(chunks))
self.assertEqual(params.content_size, zstd.CONTENTSIZE_UNKNOWN)
# self.assertEqual(params.window_size, 262144)
self.assertEqual(params.dict_id, 0)
self.assertFalse(params.has_checksum)
self.assertEqual(b"".join(chunks), cctx.compress(source.getvalue()))
def test_read_write_size(self):
source = CustomBytesIO(b"foobarfoobar")
cctx = zstd.ZstdCompressor(level=3)
for chunk in cctx.read_to_iter(source, read_size=1, write_size=1):
self.assertEqual(len(chunk), 1)
self.assertEqual(source._read_count, len(source.getvalue()) + 1)
def test_multithreaded(self):
source = io.BytesIO()
source.write(b"a" * 1048576)
source.write(b"b" * 1048576)
source.write(b"c" * 1048576)
source.seek(0)
cctx = zstd.ZstdCompressor(threads=2)
compressed = b"".join(cctx.read_to_iter(source))
self.assertEqual(len(compressed), 111)
def test_bad_size(self):
cctx = zstd.ZstdCompressor()
source = io.BytesIO(b"a" * 42)
with self.assertRaisesRegex(zstd.ZstdError, "Src size is incorrect"):
b"".join(cctx.read_to_iter(source, size=2))
# Test another operation on errored compressor.
b"".join(cctx.read_to_iter(source))
def test_read_exception(self):
b = CustomBytesIO(b"foo" * 1024)
b.read_exception = IOError("read")
cctx = zstd.ZstdCompressor()
it = cctx.read_to_iter(b)
with self.assertRaisesRegex(IOError, "read"):
next(it)
|
