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
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
import struct
import unittest
import zstandard as zstd
from .common import (
generate_samples,
get_optimal_dict_size_heuristically,
)
@unittest.skipUnless(
"multi_decompress_to_buffer" in zstd.backend_features,
"multi_decompress_to_buffer feature not available",
)
class TestDecompressor_multi_decompress_to_buffer(unittest.TestCase):
def test_invalid_inputs(self):
dctx = zstd.ZstdDecompressor()
with self.assertRaises(TypeError):
dctx.multi_decompress_to_buffer(True)
with self.assertRaises(TypeError):
dctx.multi_decompress_to_buffer((1, 2))
with self.assertRaisesRegex(
TypeError, "item 0 not a bytes like object"
):
dctx.multi_decompress_to_buffer(["foo"])
with self.assertRaisesRegex(
ValueError, "could not determine decompressed size of item 0"
):
dctx.multi_decompress_to_buffer([b"foobarbaz"])
def test_list_input(self):
cctx = zstd.ZstdCompressor()
original = [b"foo" * 4, b"bar" * 6]
frames = [cctx.compress(d) for d in original]
dctx = zstd.ZstdDecompressor()
result = dctx.multi_decompress_to_buffer(frames)
self.assertEqual(len(result), len(frames))
self.assertEqual(result.size(), sum(map(len, original)))
for i, data in enumerate(original):
self.assertEqual(result[i].tobytes(), data)
self.assertEqual(result[0].offset, 0)
self.assertEqual(len(result[0]), 12)
self.assertEqual(len(result[1]), 18)
def test_list_input_frame_sizes(self):
cctx = zstd.ZstdCompressor()
original = [b"foo" * 4, b"bar" * 6, b"baz" * 8]
frames = [cctx.compress(d) for d in original]
sizes = struct.pack("=" + "Q" * len(original), *map(len, original))
dctx = zstd.ZstdDecompressor()
result = dctx.multi_decompress_to_buffer(
frames, decompressed_sizes=sizes
)
self.assertEqual(len(result), len(frames))
self.assertEqual(result.size(), sum(map(len, original)))
for i, data in enumerate(original):
self.assertEqual(result[i].tobytes(), data)
def test_buffer_with_segments_input(self):
cctx = zstd.ZstdCompressor()
original = [b"foo" * 4, b"bar" * 6]
frames = [cctx.compress(d) for d in original]
dctx = zstd.ZstdDecompressor()
segments = struct.pack(
"=QQQQ", 0, len(frames[0]), len(frames[0]), len(frames[1])
)
b = zstd.BufferWithSegments(b"".join(frames), segments)
result = dctx.multi_decompress_to_buffer(b)
self.assertEqual(len(result), len(frames))
self.assertEqual(result[0].offset, 0)
self.assertEqual(len(result[0]), 12)
self.assertEqual(len(result[1]), 18)
def test_buffer_with_segments_sizes(self):
cctx = zstd.ZstdCompressor(write_content_size=False)
original = [b"foo" * 4, b"bar" * 6, b"baz" * 8]
frames = [cctx.compress(d) for d in original]
sizes = struct.pack("=" + "Q" * len(original), *map(len, original))
dctx = zstd.ZstdDecompressor()
segments = struct.pack(
"=QQQQQQ",
0,
len(frames[0]),
len(frames[0]),
len(frames[1]),
len(frames[0]) + len(frames[1]),
len(frames[2]),
)
b = zstd.BufferWithSegments(b"".join(frames), segments)
result = dctx.multi_decompress_to_buffer(b, decompressed_sizes=sizes)
self.assertEqual(len(result), len(frames))
self.assertEqual(result.size(), sum(map(len, original)))
for i, data in enumerate(original):
self.assertEqual(result[i].tobytes(), data)
def test_buffer_with_segments_collection_input(self):
cctx = zstd.ZstdCompressor()
original = [
b"foo0" * 2,
b"foo1" * 3,
b"foo2" * 4,
b"foo3" * 5,
b"foo4" * 6,
]
frames = cctx.multi_compress_to_buffer(original)
# Check round trip.
dctx = zstd.ZstdDecompressor()
decompressed = dctx.multi_decompress_to_buffer(frames, threads=3)
self.assertEqual(len(decompressed), len(original))
for i, data in enumerate(original):
self.assertEqual(data, decompressed[i].tobytes())
# And a manual mode.
b = b"".join([frames[0].tobytes(), frames[1].tobytes()])
b1 = zstd.BufferWithSegments(
b,
struct.pack(
"=QQQQ", 0, len(frames[0]), len(frames[0]), len(frames[1])
),
)
b = b"".join(
[frames[2].tobytes(), frames[3].tobytes(), frames[4].tobytes()]
)
b2 = zstd.BufferWithSegments(
b,
struct.pack(
"=QQQQQQ",
0,
len(frames[2]),
len(frames[2]),
len(frames[3]),
len(frames[2]) + len(frames[3]),
len(frames[4]),
),
)
c = zstd.BufferWithSegmentsCollection(b1, b2)
dctx = zstd.ZstdDecompressor()
decompressed = dctx.multi_decompress_to_buffer(c)
self.assertEqual(len(decompressed), 5)
for i in range(5):
self.assertEqual(decompressed[i].tobytes(), original[i])
def test_dict(self):
samples = generate_samples()
optSize = get_optimal_dict_size_heuristically(samples)
d = zstd.train_dictionary(optSize, samples, k=64, d=8)
cctx = zstd.ZstdCompressor(dict_data=d, level=1)
frames = [cctx.compress(s) for s in generate_samples()]
dctx = zstd.ZstdDecompressor(dict_data=d)
result = dctx.multi_decompress_to_buffer(frames)
self.assertEqual([o.tobytes() for o in result], samples)
def test_multiple_threads(self):
cctx = zstd.ZstdCompressor()
frames = []
frames.extend(cctx.compress(b"x" * 64) for i in range(256))
frames.extend(cctx.compress(b"y" * 64) for i in range(256))
dctx = zstd.ZstdDecompressor()
result = dctx.multi_decompress_to_buffer(frames, threads=-1)
self.assertEqual(len(result), len(frames))
self.assertEqual(result.size(), 2 * 64 * 256)
self.assertEqual(result[0].tobytes(), b"x" * 64)
self.assertEqual(result[256].tobytes(), b"y" * 64)
def test_item_failure(self):
cctx = zstd.ZstdCompressor()
frames = [cctx.compress(b"x" * 128), cctx.compress(b"y" * 128)]
frames[1] = frames[1][0:15] + b"extra" + frames[1][15:]
dctx = zstd.ZstdDecompressor()
with self.assertRaisesRegex(
zstd.ZstdError,
"error decompressing item 1: (Data corruption detected|Destination buffer is too small)",
):
dctx.multi_decompress_to_buffer(frames)
with self.assertRaisesRegex(
zstd.ZstdError,
"error decompressing item 1: (Data corruption detected|Destination buffer is too small)",
):
dctx.multi_decompress_to_buffer(frames, threads=2)
|
