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
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
|
import io
import unittest
import zstandard as zstd
from .common import (
NonClosingBytesIO,
CustomBytesIO,
)
class TestCompressor_stream_reader(unittest.TestCase):
def test_context_manager(self):
cctx = zstd.ZstdCompressor()
with cctx.stream_reader(b"foo") as reader:
with self.assertRaisesRegex(
ValueError, "cannot __enter__ multiple times"
):
with reader as reader2:
pass
def test_no_context_manager(self):
cctx = zstd.ZstdCompressor()
reader = cctx.stream_reader(b"foo")
reader.read(4)
self.assertFalse(reader.closed)
reader.close()
self.assertTrue(reader.closed)
with self.assertRaisesRegex(ValueError, "stream is closed"):
reader.read(1)
def test_not_implemented(self):
cctx = zstd.ZstdCompressor()
with cctx.stream_reader(b"foo" * 60) as reader:
with self.assertRaises(io.UnsupportedOperation):
reader.readline()
with self.assertRaises(io.UnsupportedOperation):
reader.readlines()
with self.assertRaises(io.UnsupportedOperation):
iter(reader)
with self.assertRaises(io.UnsupportedOperation):
next(reader)
with self.assertRaises(OSError):
reader.writelines([])
with self.assertRaises(OSError):
reader.write(b"foo")
def test_constant_methods(self):
cctx = zstd.ZstdCompressor()
with cctx.stream_reader(b"boo") as reader:
self.assertTrue(reader.readable())
self.assertFalse(reader.writable())
self.assertFalse(reader.seekable())
self.assertFalse(reader.isatty())
self.assertFalse(reader.closed)
self.assertIsNone(reader.flush())
self.assertFalse(reader.closed)
self.assertTrue(reader.closed)
def test_read_closed(self):
cctx = zstd.ZstdCompressor()
with cctx.stream_reader(b"foo" * 60) as reader:
reader.close()
self.assertTrue(reader.closed)
with self.assertRaisesRegex(ValueError, "stream is closed"):
reader.read(10)
def test_read_sizes(self):
cctx = zstd.ZstdCompressor()
foo = cctx.compress(b"foo")
with cctx.stream_reader(b"foo") as reader:
with self.assertRaisesRegex(
ValueError, "cannot read negative amounts less than -1"
):
reader.read(-2)
self.assertEqual(reader.read(0), b"")
self.assertEqual(reader.read(), foo)
def test_read_buffer(self):
cctx = zstd.ZstdCompressor()
source = b"".join([b"foo" * 60, b"bar" * 60, b"baz" * 60])
frame = cctx.compress(source)
with cctx.stream_reader(source) as reader:
self.assertEqual(reader.tell(), 0)
# We should get entire frame in one read.
result = reader.read(8192)
self.assertEqual(result, frame)
self.assertEqual(reader.tell(), len(result))
self.assertEqual(reader.read(), b"")
self.assertEqual(reader.tell(), len(result))
def test_read_buffer_small_chunks(self):
cctx = zstd.ZstdCompressor()
source = b"foo" * 60
chunks = []
with cctx.stream_reader(source) as reader:
self.assertEqual(reader.tell(), 0)
while True:
chunk = reader.read(1)
if not chunk:
break
chunks.append(chunk)
self.assertEqual(reader.tell(), sum(map(len, chunks)))
self.assertEqual(b"".join(chunks), cctx.compress(source))
def test_read_stream(self):
cctx = zstd.ZstdCompressor()
source = b"".join([b"foo" * 60, b"bar" * 60, b"baz" * 60])
frame = cctx.compress(source)
with cctx.stream_reader(io.BytesIO(source), size=len(source)) as reader:
self.assertEqual(reader.tell(), 0)
chunk = reader.read(8192)
self.assertEqual(chunk, frame)
self.assertEqual(reader.tell(), len(chunk))
self.assertEqual(reader.read(), b"")
self.assertEqual(reader.tell(), len(chunk))
def test_read_stream_small_chunks(self):
cctx = zstd.ZstdCompressor()
source = b"foo" * 60
chunks = []
with cctx.stream_reader(io.BytesIO(source), size=len(source)) as reader:
self.assertEqual(reader.tell(), 0)
while True:
chunk = reader.read(1)
if not chunk:
break
chunks.append(chunk)
self.assertEqual(reader.tell(), sum(map(len, chunks)))
self.assertEqual(b"".join(chunks), cctx.compress(source))
def test_read_after_exit(self):
cctx = zstd.ZstdCompressor()
with cctx.stream_reader(b"foo" * 60) as reader:
while reader.read(8192):
pass
with self.assertRaisesRegex(ValueError, "stream is closed"):
reader.read(10)
def test_bad_size(self):
cctx = zstd.ZstdCompressor()
source = io.BytesIO(b"foobar")
with cctx.stream_reader(source, size=2) as reader:
with self.assertRaisesRegex(
zstd.ZstdError, "Src size is incorrect"
):
reader.read(10)
# Try another compression operation.
with cctx.stream_reader(source, size=42):
pass
def test_readall(self):
cctx = zstd.ZstdCompressor()
frame = cctx.compress(b"foo" * 1024)
reader = cctx.stream_reader(b"foo" * 1024)
self.assertEqual(reader.readall(), frame)
def test_readinto(self):
cctx = zstd.ZstdCompressor()
foo = cctx.compress(b"foo")
reader = cctx.stream_reader(b"foo")
with self.assertRaises(Exception):
reader.readinto(b"foobar")
# readinto() with sufficiently large destination.
b = bytearray(1024)
reader = cctx.stream_reader(b"foo")
self.assertEqual(reader.readinto(b), len(foo))
self.assertEqual(b[0 : len(foo)], foo)
self.assertEqual(reader.readinto(b), 0)
self.assertEqual(b[0 : len(foo)], foo)
# readinto() with small reads.
b = bytearray(1024)
reader = cctx.stream_reader(b"foo", read_size=1)
self.assertEqual(reader.readinto(b), len(foo))
self.assertEqual(b[0 : len(foo)], foo)
# Too small destination buffer.
b = bytearray(2)
reader = cctx.stream_reader(b"foo")
self.assertEqual(reader.readinto(b), 2)
self.assertEqual(b[:], foo[0:2])
self.assertEqual(reader.readinto(b), 2)
self.assertEqual(b[:], foo[2:4])
self.assertEqual(reader.readinto(b), 2)
self.assertEqual(b[:], foo[4:6])
def test_readinto1(self):
cctx = zstd.ZstdCompressor()
foo = b"".join(cctx.read_to_iter(io.BytesIO(b"foo")))
reader = cctx.stream_reader(b"foo")
with self.assertRaises(Exception):
reader.readinto1(b"foobar")
b = bytearray(1024)
source = CustomBytesIO(b"foo")
reader = cctx.stream_reader(source)
self.assertEqual(reader.readinto1(b), len(foo))
self.assertEqual(b[0 : len(foo)], foo)
self.assertEqual(source._read_count, 2)
# readinto1() with small reads.
b = bytearray(1024)
source = CustomBytesIO(b"foo")
reader = cctx.stream_reader(source, read_size=1)
self.assertEqual(reader.readinto1(b), len(foo))
self.assertEqual(b[0 : len(foo)], foo)
self.assertEqual(source._read_count, 4)
def test_read1(self):
cctx = zstd.ZstdCompressor()
foo = b"".join(cctx.read_to_iter(io.BytesIO(b"foo")))
b = CustomBytesIO(b"foo")
reader = cctx.stream_reader(b)
self.assertEqual(reader.read1(), foo)
self.assertEqual(b._read_count, 2)
b = CustomBytesIO(b"foo")
reader = cctx.stream_reader(b)
self.assertEqual(reader.read1(0), b"")
self.assertEqual(reader.read1(2), foo[0:2])
self.assertEqual(b._read_count, 2)
self.assertEqual(reader.read1(2), foo[2:4])
self.assertEqual(reader.read1(1024), foo[4:])
def test_close(self):
buffer = NonClosingBytesIO(b"foo" * 1024)
cctx = zstd.ZstdCompressor()
reader = cctx.stream_reader(buffer)
reader.read(3)
self.assertFalse(reader.closed)
self.assertFalse(buffer.closed)
reader.close()
self.assertTrue(reader.closed)
self.assertTrue(buffer.closed)
with self.assertRaisesRegex(ValueError, "stream is closed"):
reader.read(3)
with self.assertRaisesRegex(ValueError, "stream is closed"):
with reader:
pass
# Context manager exit should close stream.
buffer = io.BytesIO(b"foo" * 1024)
reader = cctx.stream_reader(buffer)
with reader:
reader.read(3)
self.assertTrue(reader.closed)
self.assertTrue(buffer.closed)
# Context manager exit should close stream if an exception raised.
buffer = io.BytesIO(b"foo" * 1024)
reader = cctx.stream_reader(buffer)
with self.assertRaisesRegex(Exception, "ignore"):
with reader:
reader.read(3)
raise Exception("ignore")
self.assertTrue(reader.closed)
self.assertTrue(buffer.closed)
# Test with non-file source.
with cctx.stream_reader(b"foo" * 1024) as reader:
reader.read(3)
self.assertFalse(reader.closed)
self.assertTrue(reader.closed)
def test_close_closefd_false(self):
buffer = NonClosingBytesIO(b"foo" * 1024)
cctx = zstd.ZstdCompressor()
reader = cctx.stream_reader(buffer, closefd=False)
reader.read(3)
self.assertFalse(reader.closed)
self.assertFalse(buffer.closed)
reader.close()
self.assertTrue(reader.closed)
self.assertFalse(buffer.closed)
with self.assertRaisesRegex(ValueError, "stream is closed"):
reader.read(3)
with self.assertRaisesRegex(ValueError, "stream is closed"):
with reader:
pass
# Context manager exit should close stream.
buffer = io.BytesIO(b"foo" * 1024)
reader = cctx.stream_reader(buffer, closefd=False)
with reader:
reader.read(3)
self.assertTrue(reader.closed)
self.assertFalse(buffer.closed)
# Context manager exit should close stream if an exception raised.
buffer = io.BytesIO(b"foo" * 1024)
reader = cctx.stream_reader(buffer, closefd=False)
with self.assertRaisesRegex(Exception, "ignore"):
with reader:
reader.read(3)
raise Exception("ignore")
self.assertTrue(reader.closed)
self.assertFalse(buffer.closed)
# Test with non-file source variant.
with cctx.stream_reader(b"foo" * 1024, closefd=False) as reader:
reader.read(3)
self.assertFalse(reader.closed)
self.assertTrue(reader.closed)
def test_write_exception(self):
b = CustomBytesIO()
b.write_exception = IOError("write")
cctx = zstd.ZstdCompressor()
writer = cctx.stream_writer(b)
# Initial write won't issue write() to underlying stream.
writer.write(b"foo")
with self.assertRaisesRegex(IOError, "write"):
writer.flush()
|
