mirror of https://github.com/python/cpython
588 lines
21 KiB
Python
588 lines
21 KiB
Python
import unittest
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from test import support
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import binascii
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import random
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from test.support import precisionbigmemtest, _1G, _4G
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zlib = support.import_module('zlib')
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class ChecksumTestCase(unittest.TestCase):
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# checksum test cases
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def test_crc32start(self):
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self.assertEqual(zlib.crc32(b""), zlib.crc32(b"", 0))
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self.assertTrue(zlib.crc32(b"abc", 0xffffffff))
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def test_crc32empty(self):
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self.assertEqual(zlib.crc32(b"", 0), 0)
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self.assertEqual(zlib.crc32(b"", 1), 1)
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self.assertEqual(zlib.crc32(b"", 432), 432)
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def test_adler32start(self):
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self.assertEqual(zlib.adler32(b""), zlib.adler32(b"", 1))
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self.assertTrue(zlib.adler32(b"abc", 0xffffffff))
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def test_adler32empty(self):
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self.assertEqual(zlib.adler32(b"", 0), 0)
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self.assertEqual(zlib.adler32(b"", 1), 1)
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self.assertEqual(zlib.adler32(b"", 432), 432)
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def assertEqual32(self, seen, expected):
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# 32-bit values masked -- checksums on 32- vs 64- bit machines
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# This is important if bit 31 (0x08000000L) is set.
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self.assertEqual(seen & 0x0FFFFFFFF, expected & 0x0FFFFFFFF)
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def test_penguins(self):
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self.assertEqual32(zlib.crc32(b"penguin", 0), 0x0e5c1a120)
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self.assertEqual32(zlib.crc32(b"penguin", 1), 0x43b6aa94)
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self.assertEqual32(zlib.adler32(b"penguin", 0), 0x0bcf02f6)
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self.assertEqual32(zlib.adler32(b"penguin", 1), 0x0bd602f7)
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self.assertEqual(zlib.crc32(b"penguin"), zlib.crc32(b"penguin", 0))
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self.assertEqual(zlib.adler32(b"penguin"),zlib.adler32(b"penguin",1))
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def test_crc32_adler32_unsigned(self):
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foo = b'abcdefghijklmnop'
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# explicitly test signed behavior
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self.assertEqual(zlib.crc32(foo), 2486878355)
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self.assertEqual(zlib.crc32(b'spam'), 1138425661)
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self.assertEqual(zlib.adler32(foo+foo), 3573550353)
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self.assertEqual(zlib.adler32(b'spam'), 72286642)
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def test_same_as_binascii_crc32(self):
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foo = b'abcdefghijklmnop'
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crc = 2486878355
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self.assertEqual(binascii.crc32(foo), crc)
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self.assertEqual(zlib.crc32(foo), crc)
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self.assertEqual(binascii.crc32(b'spam'), zlib.crc32(b'spam'))
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class ExceptionTestCase(unittest.TestCase):
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# make sure we generate some expected errors
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def test_badlevel(self):
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# specifying compression level out of range causes an error
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# (but -1 is Z_DEFAULT_COMPRESSION and apparently the zlib
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# accepts 0 too)
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self.assertRaises(zlib.error, zlib.compress, b'ERROR', 10)
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def test_badargs(self):
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self.assertRaises(TypeError, zlib.adler32)
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self.assertRaises(TypeError, zlib.crc32)
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self.assertRaises(TypeError, zlib.compress)
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self.assertRaises(TypeError, zlib.decompress)
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for arg in (42, None, '', 'abc', (), []):
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self.assertRaises(TypeError, zlib.adler32, arg)
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self.assertRaises(TypeError, zlib.crc32, arg)
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self.assertRaises(TypeError, zlib.compress, arg)
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self.assertRaises(TypeError, zlib.decompress, arg)
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def test_badcompressobj(self):
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# verify failure on building compress object with bad params
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self.assertRaises(ValueError, zlib.compressobj, 1, zlib.DEFLATED, 0)
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# specifying total bits too large causes an error
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self.assertRaises(ValueError,
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zlib.compressobj, 1, zlib.DEFLATED, zlib.MAX_WBITS + 1)
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def test_baddecompressobj(self):
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# verify failure on building decompress object with bad params
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self.assertRaises(ValueError, zlib.decompressobj, -1)
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def test_decompressobj_badflush(self):
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# verify failure on calling decompressobj.flush with bad params
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self.assertRaises(ValueError, zlib.decompressobj().flush, 0)
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self.assertRaises(ValueError, zlib.decompressobj().flush, -1)
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class BaseCompressTestCase(object):
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def check_big_compress_buffer(self, size, compress_func):
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_1M = 1024 * 1024
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fmt = "%%0%dx" % (2 * _1M)
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# Generate 10MB worth of random, and expand it by repeating it.
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# The assumption is that zlib's memory is not big enough to exploit
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# such spread out redundancy.
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data = b''.join([random.getrandbits(8 * _1M).to_bytes(_1M, 'little')
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for i in range(10)])
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data = data * (size // len(data) + 1)
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try:
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compress_func(data)
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finally:
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# Release memory
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data = None
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def check_big_decompress_buffer(self, size, decompress_func):
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data = b'x' * size
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try:
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compressed = zlib.compress(data, 1)
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finally:
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# Release memory
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data = None
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data = decompress_func(compressed)
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# Sanity check
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try:
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self.assertEqual(len(data), size)
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self.assertEqual(len(data.strip(b'x')), 0)
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finally:
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data = None
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class CompressTestCase(BaseCompressTestCase, unittest.TestCase):
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# Test compression in one go (whole message compression)
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def test_speech(self):
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x = zlib.compress(HAMLET_SCENE)
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self.assertEqual(zlib.decompress(x), HAMLET_SCENE)
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def test_speech128(self):
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# compress more data
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data = HAMLET_SCENE * 128
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x = zlib.compress(data)
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self.assertEqual(zlib.compress(bytearray(data)), x)
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for ob in x, bytearray(x):
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self.assertEqual(zlib.decompress(ob), data)
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def test_incomplete_stream(self):
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# An useful error message is given
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x = zlib.compress(HAMLET_SCENE)
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self.assertRaisesRegex(zlib.error,
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"Error -5 while decompressing data: incomplete or truncated stream",
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zlib.decompress, x[:-1])
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# Memory use of the following functions takes into account overallocation
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@precisionbigmemtest(size=_1G + 1024 * 1024, memuse=3)
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def test_big_compress_buffer(self, size):
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compress = lambda s: zlib.compress(s, 1)
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self.check_big_compress_buffer(size, compress)
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@precisionbigmemtest(size=_1G + 1024 * 1024, memuse=2)
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def test_big_decompress_buffer(self, size):
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self.check_big_decompress_buffer(size, zlib.decompress)
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@precisionbigmemtest(size=_4G + 100, memuse=1)
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def test_length_overflow(self, size):
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if size < _4G + 100:
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self.skipTest("not enough free memory, need at least 4 GB")
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data = b'x' * size
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try:
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self.assertRaises(OverflowError, zlib.compress, data, 1)
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finally:
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data = None
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class CompressObjectTestCase(BaseCompressTestCase, unittest.TestCase):
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# Test compression object
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def test_pair(self):
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# straightforward compress/decompress objects
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datasrc = HAMLET_SCENE * 128
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datazip = zlib.compress(datasrc)
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# should compress both bytes and bytearray data
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for data in (datasrc, bytearray(datasrc)):
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co = zlib.compressobj()
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x1 = co.compress(data)
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x2 = co.flush()
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self.assertRaises(zlib.error, co.flush) # second flush should not work
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self.assertEqual(x1 + x2, datazip)
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for v1, v2 in ((x1, x2), (bytearray(x1), bytearray(x2))):
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dco = zlib.decompressobj()
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y1 = dco.decompress(v1 + v2)
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y2 = dco.flush()
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self.assertEqual(data, y1 + y2)
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self.assertIsInstance(dco.unconsumed_tail, bytes)
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self.assertIsInstance(dco.unused_data, bytes)
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def test_compressoptions(self):
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# specify lots of options to compressobj()
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level = 2
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method = zlib.DEFLATED
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wbits = -12
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memlevel = 9
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strategy = zlib.Z_FILTERED
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co = zlib.compressobj(level, method, wbits, memlevel, strategy)
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x1 = co.compress(HAMLET_SCENE)
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x2 = co.flush()
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dco = zlib.decompressobj(wbits)
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y1 = dco.decompress(x1 + x2)
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y2 = dco.flush()
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self.assertEqual(HAMLET_SCENE, y1 + y2)
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def test_compressincremental(self):
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# compress object in steps, decompress object as one-shot
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data = HAMLET_SCENE * 128
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co = zlib.compressobj()
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bufs = []
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for i in range(0, len(data), 256):
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bufs.append(co.compress(data[i:i+256]))
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bufs.append(co.flush())
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combuf = b''.join(bufs)
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dco = zlib.decompressobj()
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y1 = dco.decompress(b''.join(bufs))
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y2 = dco.flush()
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self.assertEqual(data, y1 + y2)
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def test_decompinc(self, flush=False, source=None, cx=256, dcx=64):
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# compress object in steps, decompress object in steps
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source = source or HAMLET_SCENE
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data = source * 128
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co = zlib.compressobj()
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bufs = []
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for i in range(0, len(data), cx):
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bufs.append(co.compress(data[i:i+cx]))
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bufs.append(co.flush())
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combuf = b''.join(bufs)
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decombuf = zlib.decompress(combuf)
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# Test type of return value
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self.assertIsInstance(decombuf, bytes)
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self.assertEqual(data, decombuf)
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dco = zlib.decompressobj()
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bufs = []
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for i in range(0, len(combuf), dcx):
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bufs.append(dco.decompress(combuf[i:i+dcx]))
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self.assertEqual(b'', dco.unconsumed_tail, ########
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"(A) uct should be b'': not %d long" %
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len(dco.unconsumed_tail))
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self.assertEqual(b'', dco.unused_data)
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if flush:
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bufs.append(dco.flush())
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else:
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while True:
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chunk = dco.decompress(b'')
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if chunk:
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bufs.append(chunk)
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else:
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break
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self.assertEqual(b'', dco.unconsumed_tail, ########
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"(B) uct should be b'': not %d long" %
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len(dco.unconsumed_tail))
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self.assertEqual(b'', dco.unused_data)
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self.assertEqual(data, b''.join(bufs))
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# Failure means: "decompressobj with init options failed"
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def test_decompincflush(self):
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self.test_decompinc(flush=True)
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def test_decompimax(self, source=None, cx=256, dcx=64):
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# compress in steps, decompress in length-restricted steps
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source = source or HAMLET_SCENE
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# Check a decompression object with max_length specified
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data = source * 128
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co = zlib.compressobj()
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bufs = []
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for i in range(0, len(data), cx):
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bufs.append(co.compress(data[i:i+cx]))
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bufs.append(co.flush())
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combuf = b''.join(bufs)
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self.assertEqual(data, zlib.decompress(combuf),
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'compressed data failure')
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dco = zlib.decompressobj()
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bufs = []
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cb = combuf
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while cb:
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#max_length = 1 + len(cb)//10
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chunk = dco.decompress(cb, dcx)
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self.assertFalse(len(chunk) > dcx,
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'chunk too big (%d>%d)' % (len(chunk), dcx))
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bufs.append(chunk)
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cb = dco.unconsumed_tail
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bufs.append(dco.flush())
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self.assertEqual(data, b''.join(bufs), 'Wrong data retrieved')
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def test_decompressmaxlen(self, flush=False):
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# Check a decompression object with max_length specified
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data = HAMLET_SCENE * 128
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co = zlib.compressobj()
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bufs = []
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for i in range(0, len(data), 256):
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bufs.append(co.compress(data[i:i+256]))
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bufs.append(co.flush())
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combuf = b''.join(bufs)
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self.assertEqual(data, zlib.decompress(combuf),
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'compressed data failure')
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dco = zlib.decompressobj()
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bufs = []
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cb = combuf
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while cb:
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max_length = 1 + len(cb)//10
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chunk = dco.decompress(cb, max_length)
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self.assertFalse(len(chunk) > max_length,
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'chunk too big (%d>%d)' % (len(chunk),max_length))
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bufs.append(chunk)
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cb = dco.unconsumed_tail
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if flush:
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bufs.append(dco.flush())
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else:
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while chunk:
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chunk = dco.decompress(b'', max_length)
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self.assertFalse(len(chunk) > max_length,
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'chunk too big (%d>%d)' % (len(chunk),max_length))
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bufs.append(chunk)
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self.assertEqual(data, b''.join(bufs), 'Wrong data retrieved')
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def test_decompressmaxlenflush(self):
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self.test_decompressmaxlen(flush=True)
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def test_maxlenmisc(self):
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# Misc tests of max_length
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dco = zlib.decompressobj()
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self.assertRaises(ValueError, dco.decompress, b"", -1)
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self.assertEqual(b'', dco.unconsumed_tail)
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def test_flushes(self):
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# Test flush() with the various options, using all the
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# different levels in order to provide more variations.
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sync_opt = ['Z_NO_FLUSH', 'Z_SYNC_FLUSH', 'Z_FULL_FLUSH']
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sync_opt = [getattr(zlib, opt) for opt in sync_opt
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if hasattr(zlib, opt)]
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data = HAMLET_SCENE * 8
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for sync in sync_opt:
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for level in range(10):
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obj = zlib.compressobj( level )
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a = obj.compress( data[:3000] )
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b = obj.flush( sync )
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c = obj.compress( data[3000:] )
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d = obj.flush()
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self.assertEqual(zlib.decompress(b''.join([a,b,c,d])),
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data, ("Decompress failed: flush "
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"mode=%i, level=%i") % (sync, level))
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del obj
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def test_odd_flush(self):
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# Test for odd flushing bugs noted in 2.0, and hopefully fixed in 2.1
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import random
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if hasattr(zlib, 'Z_SYNC_FLUSH'):
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# Testing on 17K of "random" data
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# Create compressor and decompressor objects
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co = zlib.compressobj(zlib.Z_BEST_COMPRESSION)
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dco = zlib.decompressobj()
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# Try 17K of data
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# generate random data stream
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try:
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# In 2.3 and later, WichmannHill is the RNG of the bug report
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gen = random.WichmannHill()
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except AttributeError:
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try:
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# 2.2 called it Random
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gen = random.Random()
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except AttributeError:
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# others might simply have a single RNG
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gen = random
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gen.seed(1)
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data = genblock(1, 17 * 1024, generator=gen)
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# compress, sync-flush, and decompress
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first = co.compress(data)
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second = co.flush(zlib.Z_SYNC_FLUSH)
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expanded = dco.decompress(first + second)
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# if decompressed data is different from the input data, choke.
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self.assertEqual(expanded, data, "17K random source doesn't match")
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def test_empty_flush(self):
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# Test that calling .flush() on unused objects works.
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# (Bug #1083110 -- calling .flush() on decompress objects
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# caused a core dump.)
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co = zlib.compressobj(zlib.Z_BEST_COMPRESSION)
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self.assertTrue(co.flush()) # Returns a zlib header
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dco = zlib.decompressobj()
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self.assertEqual(dco.flush(), b"") # Returns nothing
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def test_decompress_incomplete_stream(self):
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# This is 'foo', deflated
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x = b'x\x9cK\xcb\xcf\x07\x00\x02\x82\x01E'
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# For the record
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self.assertEqual(zlib.decompress(x), b'foo')
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self.assertRaises(zlib.error, zlib.decompress, x[:-5])
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# Omitting the stream end works with decompressor objects
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# (see issue #8672).
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dco = zlib.decompressobj()
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y = dco.decompress(x[:-5])
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y += dco.flush()
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self.assertEqual(y, b'foo')
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if hasattr(zlib.compressobj(), "copy"):
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def test_compresscopy(self):
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# Test copying a compression object
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data0 = HAMLET_SCENE
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data1 = bytes(str(HAMLET_SCENE, "ascii").swapcase(), "ascii")
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c0 = zlib.compressobj(zlib.Z_BEST_COMPRESSION)
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bufs0 = []
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bufs0.append(c0.compress(data0))
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c1 = c0.copy()
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bufs1 = bufs0[:]
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bufs0.append(c0.compress(data0))
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bufs0.append(c0.flush())
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s0 = b''.join(bufs0)
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bufs1.append(c1.compress(data1))
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bufs1.append(c1.flush())
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s1 = b''.join(bufs1)
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self.assertEqual(zlib.decompress(s0),data0+data0)
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self.assertEqual(zlib.decompress(s1),data0+data1)
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def test_badcompresscopy(self):
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# Test copying a compression object in an inconsistent state
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c = zlib.compressobj()
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c.compress(HAMLET_SCENE)
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c.flush()
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self.assertRaises(ValueError, c.copy)
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if hasattr(zlib.decompressobj(), "copy"):
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def test_decompresscopy(self):
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# Test copying a decompression object
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data = HAMLET_SCENE
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comp = zlib.compress(data)
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# Test type of return value
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self.assertIsInstance(comp, bytes)
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d0 = zlib.decompressobj()
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bufs0 = []
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bufs0.append(d0.decompress(comp[:32]))
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d1 = d0.copy()
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bufs1 = bufs0[:]
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bufs0.append(d0.decompress(comp[32:]))
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s0 = b''.join(bufs0)
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|
|
|
bufs1.append(d1.decompress(comp[32:]))
|
|
s1 = b''.join(bufs1)
|
|
|
|
self.assertEqual(s0,s1)
|
|
self.assertEqual(s0,data)
|
|
|
|
def test_baddecompresscopy(self):
|
|
# Test copying a compression object in an inconsistent state
|
|
data = zlib.compress(HAMLET_SCENE)
|
|
d = zlib.decompressobj()
|
|
d.decompress(data)
|
|
d.flush()
|
|
self.assertRaises(ValueError, d.copy)
|
|
|
|
# Memory use of the following functions takes into account overallocation
|
|
|
|
@precisionbigmemtest(size=_1G + 1024 * 1024, memuse=3)
|
|
def test_big_compress_buffer(self, size):
|
|
c = zlib.compressobj(1)
|
|
compress = lambda s: c.compress(s) + c.flush()
|
|
self.check_big_compress_buffer(size, compress)
|
|
|
|
@precisionbigmemtest(size=_1G + 1024 * 1024, memuse=2)
|
|
def test_big_decompress_buffer(self, size):
|
|
d = zlib.decompressobj()
|
|
decompress = lambda s: d.decompress(s) + d.flush()
|
|
self.check_big_decompress_buffer(size, decompress)
|
|
|
|
|
|
def genblock(seed, length, step=1024, generator=random):
|
|
"""length-byte stream of random data from a seed (in step-byte blocks)."""
|
|
if seed is not None:
|
|
generator.seed(seed)
|
|
randint = generator.randint
|
|
if length < step or step < 2:
|
|
step = length
|
|
blocks = bytes()
|
|
for i in range(0, length, step):
|
|
blocks += bytes(randint(0, 255) for x in range(step))
|
|
return blocks
|
|
|
|
|
|
|
|
def choose_lines(source, number, seed=None, generator=random):
|
|
"""Return a list of number lines randomly chosen from the source"""
|
|
if seed is not None:
|
|
generator.seed(seed)
|
|
sources = source.split('\n')
|
|
return [generator.choice(sources) for n in range(number)]
|
|
|
|
|
|
|
|
HAMLET_SCENE = b"""
|
|
LAERTES
|
|
|
|
O, fear me not.
|
|
I stay too long: but here my father comes.
|
|
|
|
Enter POLONIUS
|
|
|
|
A double blessing is a double grace,
|
|
Occasion smiles upon a second leave.
|
|
|
|
LORD POLONIUS
|
|
|
|
Yet here, Laertes! aboard, aboard, for shame!
|
|
The wind sits in the shoulder of your sail,
|
|
And you are stay'd for. There; my blessing with thee!
|
|
And these few precepts in thy memory
|
|
See thou character. Give thy thoughts no tongue,
|
|
Nor any unproportioned thought his act.
|
|
Be thou familiar, but by no means vulgar.
|
|
Those friends thou hast, and their adoption tried,
|
|
Grapple them to thy soul with hoops of steel;
|
|
But do not dull thy palm with entertainment
|
|
Of each new-hatch'd, unfledged comrade. Beware
|
|
Of entrance to a quarrel, but being in,
|
|
Bear't that the opposed may beware of thee.
|
|
Give every man thy ear, but few thy voice;
|
|
Take each man's censure, but reserve thy judgment.
|
|
Costly thy habit as thy purse can buy,
|
|
But not express'd in fancy; rich, not gaudy;
|
|
For the apparel oft proclaims the man,
|
|
And they in France of the best rank and station
|
|
Are of a most select and generous chief in that.
|
|
Neither a borrower nor a lender be;
|
|
For loan oft loses both itself and friend,
|
|
And borrowing dulls the edge of husbandry.
|
|
This above all: to thine ownself be true,
|
|
And it must follow, as the night the day,
|
|
Thou canst not then be false to any man.
|
|
Farewell: my blessing season this in thee!
|
|
|
|
LAERTES
|
|
|
|
Most humbly do I take my leave, my lord.
|
|
|
|
LORD POLONIUS
|
|
|
|
The time invites you; go; your servants tend.
|
|
|
|
LAERTES
|
|
|
|
Farewell, Ophelia; and remember well
|
|
What I have said to you.
|
|
|
|
OPHELIA
|
|
|
|
'Tis in my memory lock'd,
|
|
And you yourself shall keep the key of it.
|
|
|
|
LAERTES
|
|
|
|
Farewell.
|
|
"""
|
|
|
|
|
|
def test_main():
|
|
support.run_unittest(
|
|
ChecksumTestCase,
|
|
ExceptionTestCase,
|
|
CompressTestCase,
|
|
CompressObjectTestCase
|
|
)
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main() # XXX
|
|
###test_main()
|