| 1 | import unittest
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| 2 | from test import test_support
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| 3 | import zlib
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| 4 | import random
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| 5 |
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| 6 | # print test_support.TESTFN
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| 7 |
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| 8 | def getbuf():
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| 9 | # This was in the original. Avoid non-repeatable sources.
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| 10 | # Left here (unused) in case something wants to be done with it.
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| 11 | import imp
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| 12 | try:
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| 13 | t = imp.find_module('test_zlib')
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| 14 | file = t[0]
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| 15 | except ImportError:
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| 16 | file = open(__file__)
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| 17 | buf = file.read() * 8
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| 18 | file.close()
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| 19 | return buf
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| 20 |
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| 21 |
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| 22 |
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| 23 | class ChecksumTestCase(unittest.TestCase):
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| 24 | # checksum test cases
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| 25 | def test_crc32start(self):
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| 26 | self.assertEqual(zlib.crc32(""), zlib.crc32("", 0))
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| 27 | self.assert_(zlib.crc32("abc", 0xffffffff))
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| 28 |
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| 29 | def test_crc32empty(self):
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| 30 | self.assertEqual(zlib.crc32("", 0), 0)
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| 31 | self.assertEqual(zlib.crc32("", 1), 1)
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| 32 | self.assertEqual(zlib.crc32("", 432), 432)
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| 33 |
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| 34 | def test_adler32start(self):
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| 35 | self.assertEqual(zlib.adler32(""), zlib.adler32("", 1))
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| 36 | self.assert_(zlib.adler32("abc", 0xffffffff))
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| 37 |
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| 38 | def test_adler32empty(self):
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| 39 | self.assertEqual(zlib.adler32("", 0), 0)
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| 40 | self.assertEqual(zlib.adler32("", 1), 1)
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| 41 | self.assertEqual(zlib.adler32("", 432), 432)
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| 42 |
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| 43 | def assertEqual32(self, seen, expected):
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| 44 | # 32-bit values masked -- checksums on 32- vs 64- bit machines
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| 45 | # This is important if bit 31 (0x08000000L) is set.
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| 46 | self.assertEqual(seen & 0x0FFFFFFFFL, expected & 0x0FFFFFFFFL)
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| 47 |
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| 48 | def test_penguins(self):
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| 49 | self.assertEqual32(zlib.crc32("penguin", 0), 0x0e5c1a120L)
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| 50 | self.assertEqual32(zlib.crc32("penguin", 1), 0x43b6aa94)
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| 51 | self.assertEqual32(zlib.adler32("penguin", 0), 0x0bcf02f6)
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| 52 | self.assertEqual32(zlib.adler32("penguin", 1), 0x0bd602f7)
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| 53 |
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| 54 | self.assertEqual(zlib.crc32("penguin"), zlib.crc32("penguin", 0))
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| 55 | self.assertEqual(zlib.adler32("penguin"),zlib.adler32("penguin",1))
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| 56 |
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| 57 |
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| 58 |
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| 59 | class ExceptionTestCase(unittest.TestCase):
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| 60 | # make sure we generate some expected errors
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| 61 | def test_bigbits(self):
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| 62 | # specifying total bits too large causes an error
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| 63 | self.assertRaises(zlib.error,
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| 64 | zlib.compress, 'ERROR', zlib.MAX_WBITS + 1)
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| 65 |
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| 66 | def test_badcompressobj(self):
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| 67 | # verify failure on building compress object with bad params
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| 68 | self.assertRaises(ValueError, zlib.compressobj, 1, zlib.DEFLATED, 0)
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| 69 |
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| 70 | def test_baddecompressobj(self):
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| 71 | # verify failure on building decompress object with bad params
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| 72 | self.assertRaises(ValueError, zlib.decompressobj, 0)
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| 73 |
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| 74 |
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| 75 |
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| 76 | class CompressTestCase(unittest.TestCase):
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| 77 | # Test compression in one go (whole message compression)
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| 78 | def test_speech(self):
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| 79 | x = zlib.compress(HAMLET_SCENE)
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| 80 | self.assertEqual(zlib.decompress(x), HAMLET_SCENE)
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| 81 |
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| 82 | def test_speech128(self):
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| 83 | # compress more data
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| 84 | data = HAMLET_SCENE * 128
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| 85 | x = zlib.compress(data)
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| 86 | self.assertEqual(zlib.decompress(x), data)
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| 87 |
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| 88 |
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| 89 |
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| 90 |
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| 91 | class CompressObjectTestCase(unittest.TestCase):
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| 92 | # Test compression object
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| 93 | def test_pair(self):
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| 94 | # straightforward compress/decompress objects
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| 95 | data = HAMLET_SCENE * 128
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| 96 | co = zlib.compressobj()
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| 97 | x1 = co.compress(data)
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| 98 | x2 = co.flush()
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| 99 | self.assertRaises(zlib.error, co.flush) # second flush should not work
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| 100 | dco = zlib.decompressobj()
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| 101 | y1 = dco.decompress(x1 + x2)
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| 102 | y2 = dco.flush()
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| 103 | self.assertEqual(data, y1 + y2)
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| 104 |
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| 105 | def test_compressoptions(self):
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| 106 | # specify lots of options to compressobj()
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| 107 | level = 2
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| 108 | method = zlib.DEFLATED
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| 109 | wbits = -12
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| 110 | memlevel = 9
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| 111 | strategy = zlib.Z_FILTERED
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| 112 | co = zlib.compressobj(level, method, wbits, memlevel, strategy)
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| 113 | x1 = co.compress(HAMLET_SCENE)
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| 114 | x2 = co.flush()
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| 115 | dco = zlib.decompressobj(wbits)
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| 116 | y1 = dco.decompress(x1 + x2)
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| 117 | y2 = dco.flush()
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| 118 | self.assertEqual(HAMLET_SCENE, y1 + y2)
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| 119 |
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| 120 | def test_compressincremental(self):
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| 121 | # compress object in steps, decompress object as one-shot
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| 122 | data = HAMLET_SCENE * 128
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| 123 | co = zlib.compressobj()
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| 124 | bufs = []
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| 125 | for i in range(0, len(data), 256):
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| 126 | bufs.append(co.compress(data[i:i+256]))
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| 127 | bufs.append(co.flush())
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| 128 | combuf = ''.join(bufs)
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| 129 |
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| 130 | dco = zlib.decompressobj()
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| 131 | y1 = dco.decompress(''.join(bufs))
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| 132 | y2 = dco.flush()
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| 133 | self.assertEqual(data, y1 + y2)
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| 134 |
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| 135 | def test_decompinc(self, flush=False, source=None, cx=256, dcx=64):
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| 136 | # compress object in steps, decompress object in steps
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| 137 | source = source or HAMLET_SCENE
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| 138 | data = source * 128
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| 139 | co = zlib.compressobj()
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| 140 | bufs = []
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| 141 | for i in range(0, len(data), cx):
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| 142 | bufs.append(co.compress(data[i:i+cx]))
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| 143 | bufs.append(co.flush())
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| 144 | combuf = ''.join(bufs)
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| 145 |
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| 146 | self.assertEqual(data, zlib.decompress(combuf))
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| 147 |
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| 148 | dco = zlib.decompressobj()
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| 149 | bufs = []
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| 150 | for i in range(0, len(combuf), dcx):
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| 151 | bufs.append(dco.decompress(combuf[i:i+dcx]))
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| 152 | self.assertEqual('', dco.unconsumed_tail, ########
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| 153 | "(A) uct should be '': not %d long" %
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| 154 | len(dco.unconsumed_tail))
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| 155 | if flush:
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| 156 | bufs.append(dco.flush())
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| 157 | else:
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| 158 | while True:
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| 159 | chunk = dco.decompress('')
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| 160 | if chunk:
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| 161 | bufs.append(chunk)
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| 162 | else:
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| 163 | break
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| 164 | self.assertEqual('', dco.unconsumed_tail, ########
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| 165 | "(B) uct should be '': not %d long" %
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| 166 | len(dco.unconsumed_tail))
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| 167 | self.assertEqual(data, ''.join(bufs))
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| 168 | # Failure means: "decompressobj with init options failed"
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| 169 |
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| 170 | def test_decompincflush(self):
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| 171 | self.test_decompinc(flush=True)
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| 172 |
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| 173 | def test_decompimax(self, source=None, cx=256, dcx=64):
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| 174 | # compress in steps, decompress in length-restricted steps
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| 175 | source = source or HAMLET_SCENE
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| 176 | # Check a decompression object with max_length specified
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| 177 | data = source * 128
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| 178 | co = zlib.compressobj()
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| 179 | bufs = []
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| 180 | for i in range(0, len(data), cx):
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| 181 | bufs.append(co.compress(data[i:i+cx]))
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| 182 | bufs.append(co.flush())
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| 183 | combuf = ''.join(bufs)
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| 184 | self.assertEqual(data, zlib.decompress(combuf),
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| 185 | 'compressed data failure')
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| 186 |
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| 187 | dco = zlib.decompressobj()
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| 188 | bufs = []
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| 189 | cb = combuf
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| 190 | while cb:
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| 191 | #max_length = 1 + len(cb)//10
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| 192 | chunk = dco.decompress(cb, dcx)
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| 193 | self.failIf(len(chunk) > dcx,
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| 194 | 'chunk too big (%d>%d)' % (len(chunk), dcx))
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| 195 | bufs.append(chunk)
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| 196 | cb = dco.unconsumed_tail
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| 197 | bufs.append(dco.flush())
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| 198 | self.assertEqual(data, ''.join(bufs), 'Wrong data retrieved')
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| 199 |
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| 200 | def test_decompressmaxlen(self, flush=False):
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| 201 | # Check a decompression object with max_length specified
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| 202 | data = HAMLET_SCENE * 128
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| 203 | co = zlib.compressobj()
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| 204 | bufs = []
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| 205 | for i in range(0, len(data), 256):
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| 206 | bufs.append(co.compress(data[i:i+256]))
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| 207 | bufs.append(co.flush())
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| 208 | combuf = ''.join(bufs)
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| 209 | self.assertEqual(data, zlib.decompress(combuf),
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| 210 | 'compressed data failure')
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| 211 |
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| 212 | dco = zlib.decompressobj()
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| 213 | bufs = []
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| 214 | cb = combuf
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| 215 | while cb:
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| 216 | max_length = 1 + len(cb)//10
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| 217 | chunk = dco.decompress(cb, max_length)
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| 218 | self.failIf(len(chunk) > max_length,
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| 219 | 'chunk too big (%d>%d)' % (len(chunk),max_length))
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| 220 | bufs.append(chunk)
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| 221 | cb = dco.unconsumed_tail
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| 222 | if flush:
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| 223 | bufs.append(dco.flush())
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| 224 | else:
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| 225 | while chunk:
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| 226 | chunk = dco.decompress('', max_length)
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| 227 | self.failIf(len(chunk) > max_length,
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| 228 | 'chunk too big (%d>%d)' % (len(chunk),max_length))
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| 229 | bufs.append(chunk)
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| 230 | self.assertEqual(data, ''.join(bufs), 'Wrong data retrieved')
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| 231 |
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| 232 | def test_decompressmaxlenflush(self):
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| 233 | self.test_decompressmaxlen(flush=True)
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| 234 |
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| 235 | def test_maxlenmisc(self):
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| 236 | # Misc tests of max_length
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| 237 | dco = zlib.decompressobj()
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| 238 | self.assertRaises(ValueError, dco.decompress, "", -1)
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| 239 | self.assertEqual('', dco.unconsumed_tail)
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| 240 |
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| 241 | def test_flushes(self):
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| 242 | # Test flush() with the various options, using all the
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| 243 | # different levels in order to provide more variations.
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| 244 | sync_opt = ['Z_NO_FLUSH', 'Z_SYNC_FLUSH', 'Z_FULL_FLUSH']
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| 245 | sync_opt = [getattr(zlib, opt) for opt in sync_opt
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| 246 | if hasattr(zlib, opt)]
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| 247 | data = HAMLET_SCENE * 8
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| 248 |
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| 249 | for sync in sync_opt:
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| 250 | for level in range(10):
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| 251 | obj = zlib.compressobj( level )
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| 252 | a = obj.compress( data[:3000] )
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| 253 | b = obj.flush( sync )
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| 254 | c = obj.compress( data[3000:] )
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| 255 | d = obj.flush()
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| 256 | self.assertEqual(zlib.decompress(''.join([a,b,c,d])),
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| 257 | data, ("Decompress failed: flush "
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| 258 | "mode=%i, level=%i") % (sync, level))
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| 259 | del obj
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| 260 |
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| 261 | def test_odd_flush(self):
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| 262 | # Test for odd flushing bugs noted in 2.0, and hopefully fixed in 2.1
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| 263 | import random
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| 264 |
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| 265 | if hasattr(zlib, 'Z_SYNC_FLUSH'):
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| 266 | # Testing on 17K of "random" data
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| 267 |
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| 268 | # Create compressor and decompressor objects
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| 269 | co = zlib.compressobj(zlib.Z_BEST_COMPRESSION)
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| 270 | dco = zlib.decompressobj()
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| 271 |
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| 272 | # Try 17K of data
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| 273 | # generate random data stream
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| 274 | try:
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| 275 | # In 2.3 and later, WichmannHill is the RNG of the bug report
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| 276 | gen = random.WichmannHill()
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| 277 | except AttributeError:
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| 278 | try:
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| 279 | # 2.2 called it Random
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| 280 | gen = random.Random()
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| 281 | except AttributeError:
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| 282 | # others might simply have a single RNG
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| 283 | gen = random
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| 284 | gen.seed(1)
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| 285 | data = genblock(1, 17 * 1024, generator=gen)
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| 286 |
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| 287 | # compress, sync-flush, and decompress
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| 288 | first = co.compress(data)
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| 289 | second = co.flush(zlib.Z_SYNC_FLUSH)
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| 290 | expanded = dco.decompress(first + second)
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| 291 |
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| 292 | # if decompressed data is different from the input data, choke.
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| 293 | self.assertEqual(expanded, data, "17K random source doesn't match")
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| 294 |
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| 295 | def test_empty_flush(self):
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| 296 | # Test that calling .flush() on unused objects works.
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| 297 | # (Bug #1083110 -- calling .flush() on decompress objects
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| 298 | # caused a core dump.)
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| 299 |
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| 300 | co = zlib.compressobj(zlib.Z_BEST_COMPRESSION)
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| 301 | self.failUnless(co.flush()) # Returns a zlib header
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| 302 | dco = zlib.decompressobj()
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| 303 | self.assertEqual(dco.flush(), "") # Returns nothing
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| 304 |
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| 305 | if hasattr(zlib.compressobj(), "copy"):
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| 306 | def test_compresscopy(self):
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| 307 | # Test copying a compression object
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| 308 | data0 = HAMLET_SCENE
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| 309 | data1 = HAMLET_SCENE.swapcase()
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| 310 | c0 = zlib.compressobj(zlib.Z_BEST_COMPRESSION)
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| 311 | bufs0 = []
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| 312 | bufs0.append(c0.compress(data0))
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| 313 |
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| 314 | c1 = c0.copy()
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| 315 | bufs1 = bufs0[:]
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| 316 |
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| 317 | bufs0.append(c0.compress(data0))
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| 318 | bufs0.append(c0.flush())
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| 319 | s0 = ''.join(bufs0)
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| 320 |
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| 321 | bufs1.append(c1.compress(data1))
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| 322 | bufs1.append(c1.flush())
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| 323 | s1 = ''.join(bufs1)
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| 324 |
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| 325 | self.assertEqual(zlib.decompress(s0),data0+data0)
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| 326 | self.assertEqual(zlib.decompress(s1),data0+data1)
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| 327 |
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| 328 | def test_badcompresscopy(self):
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| 329 | # Test copying a compression object in an inconsistent state
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| 330 | c = zlib.compressobj()
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| 331 | c.compress(HAMLET_SCENE)
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| 332 | c.flush()
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| 333 | self.assertRaises(ValueError, c.copy)
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| 334 |
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| 335 | if hasattr(zlib.decompressobj(), "copy"):
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| 336 | def test_decompresscopy(self):
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| 337 | # Test copying a decompression object
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| 338 | data = HAMLET_SCENE
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| 339 | comp = zlib.compress(data)
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| 340 |
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| 341 | d0 = zlib.decompressobj()
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| 342 | bufs0 = []
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| 343 | bufs0.append(d0.decompress(comp[:32]))
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| 344 |
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| 345 | d1 = d0.copy()
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| 346 | bufs1 = bufs0[:]
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| 347 |
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| 348 | bufs0.append(d0.decompress(comp[32:]))
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| 349 | s0 = ''.join(bufs0)
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| 350 |
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| 351 | bufs1.append(d1.decompress(comp[32:]))
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| 352 | s1 = ''.join(bufs1)
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| 353 |
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| 354 | self.assertEqual(s0,s1)
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| 355 | self.assertEqual(s0,data)
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| 356 |
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| 357 | def test_baddecompresscopy(self):
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| 358 | # Test copying a compression object in an inconsistent state
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| 359 | data = zlib.compress(HAMLET_SCENE)
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| 360 | d = zlib.decompressobj()
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| 361 | d.decompress(data)
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| 362 | d.flush()
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| 363 | self.assertRaises(ValueError, d.copy)
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| 364 |
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| 365 | def genblock(seed, length, step=1024, generator=random):
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| 366 | """length-byte stream of random data from a seed (in step-byte blocks)."""
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| 367 | if seed is not None:
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| 368 | generator.seed(seed)
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| 369 | randint = generator.randint
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| 370 | if length < step or step < 2:
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| 371 | step = length
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| 372 | blocks = []
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| 373 | for i in range(0, length, step):
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| 374 | blocks.append(''.join([chr(randint(0,255))
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| 375 | for x in range(step)]))
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| 376 | return ''.join(blocks)[:length]
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| 377 |
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| 378 |
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| 379 |
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| 380 | def choose_lines(source, number, seed=None, generator=random):
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| 381 | """Return a list of number lines randomly chosen from the source"""
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| 382 | if seed is not None:
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| 383 | generator.seed(seed)
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| 384 | sources = source.split('\n')
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| 385 | return [generator.choice(sources) for n in range(number)]
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| 386 |
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| 387 |
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| 388 |
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| 389 | HAMLET_SCENE = """
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| 390 | LAERTES
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| 391 |
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| 392 | O, fear me not.
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| 393 | I stay too long: but here my father comes.
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| 394 |
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| 395 | Enter POLONIUS
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| 396 |
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| 397 | A double blessing is a double grace,
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| 398 | Occasion smiles upon a second leave.
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| 399 |
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| 400 | LORD POLONIUS
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| 401 |
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| 402 | Yet here, Laertes! aboard, aboard, for shame!
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| 403 | The wind sits in the shoulder of your sail,
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| 404 | And you are stay'd for. There; my blessing with thee!
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| 405 | And these few precepts in thy memory
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| 406 | See thou character. Give thy thoughts no tongue,
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| 407 | Nor any unproportioned thought his act.
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| 408 | Be thou familiar, but by no means vulgar.
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| 409 | Those friends thou hast, and their adoption tried,
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| 410 | Grapple them to thy soul with hoops of steel;
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| 411 | But do not dull thy palm with entertainment
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| 412 | Of each new-hatch'd, unfledged comrade. Beware
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| 413 | Of entrance to a quarrel, but being in,
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| 414 | Bear't that the opposed may beware of thee.
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| 415 | Give every man thy ear, but few thy voice;
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| 416 | Take each man's censure, but reserve thy judgment.
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| 417 | Costly thy habit as thy purse can buy,
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| 418 | But not express'd in fancy; rich, not gaudy;
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| 419 | For the apparel oft proclaims the man,
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| 420 | And they in France of the best rank and station
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| 421 | Are of a most select and generous chief in that.
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| 422 | Neither a borrower nor a lender be;
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| 423 | For loan oft loses both itself and friend,
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| 424 | And borrowing dulls the edge of husbandry.
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| 425 | This above all: to thine ownself be true,
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| 426 | And it must follow, as the night the day,
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| 427 | Thou canst not then be false to any man.
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| 428 | Farewell: my blessing season this in thee!
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| 429 |
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| 430 | LAERTES
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| 431 |
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| 432 | Most humbly do I take my leave, my lord.
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| 433 |
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| 434 | LORD POLONIUS
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| 435 |
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| 436 | The time invites you; go; your servants tend.
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| 437 |
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| 438 | LAERTES
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| 439 |
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| 440 | Farewell, Ophelia; and remember well
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| 441 | What I have said to you.
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| 442 |
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| 443 | OPHELIA
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| 444 |
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| 445 | 'Tis in my memory lock'd,
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| 446 | And you yourself shall keep the key of it.
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| 447 |
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| 448 | LAERTES
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| 449 |
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| 450 | Farewell.
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| 451 | """
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| 452 |
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| 453 |
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| 454 | def test_main():
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| 455 | test_support.run_unittest(
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| 456 | ChecksumTestCase,
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| 457 | ExceptionTestCase,
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| 458 | CompressTestCase,
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| 459 | CompressObjectTestCase
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| 460 | )
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| 461 |
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| 462 | if __name__ == "__main__":
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| 463 | test_main()
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| 464 |
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| 465 | def test(tests=''):
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| 466 | if not tests: tests = 'o'
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| 467 | testcases = []
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| 468 | if 'k' in tests: testcases.append(ChecksumTestCase)
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| 469 | if 'x' in tests: testcases.append(ExceptionTestCase)
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| 470 | if 'c' in tests: testcases.append(CompressTestCase)
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| 471 | if 'o' in tests: testcases.append(CompressObjectTestCase)
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| 472 | test_support.run_unittest(*testcases)
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| 473 |
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| 474 | if False:
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| 475 | import sys
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| 476 | sys.path.insert(1, '/Py23Src/python/dist/src/Lib/test')
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| 477 | import test_zlib as tz
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| 478 | ts, ut = tz.test_support, tz.unittest
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| 479 | su = ut.TestSuite()
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| 480 | su.addTest(ut.makeSuite(tz.CompressTestCase))
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| 481 | ts.run_suite(su)
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