461 lines
16 KiB
Python
461 lines
16 KiB
Python
import unittest
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from test import test_support
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import zlib
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import random
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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(""), zlib.crc32("", 0))
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self.assert_(zlib.crc32("abc", 0xffffffff))
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def test_crc32empty(self):
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self.assertEqual(zlib.crc32("", 0), 0)
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self.assertEqual(zlib.crc32("", 1), 1)
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self.assertEqual(zlib.crc32("", 432), 432)
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def test_adler32start(self):
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self.assertEqual(zlib.adler32(""), zlib.adler32("", 1))
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self.assert_(zlib.adler32("abc", 0xffffffff))
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def test_adler32empty(self):
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self.assertEqual(zlib.adler32("", 0), 0)
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self.assertEqual(zlib.adler32("", 1), 1)
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self.assertEqual(zlib.adler32("", 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 & 0x0FFFFFFFFL, expected & 0x0FFFFFFFFL)
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def test_penguins(self):
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self.assertEqual32(zlib.crc32("penguin", 0), 0x0e5c1a120L)
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self.assertEqual32(zlib.crc32("penguin", 1), 0x43b6aa94)
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self.assertEqual32(zlib.adler32("penguin", 0), 0x0bcf02f6)
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self.assertEqual32(zlib.adler32("penguin", 1), 0x0bd602f7)
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self.assertEqual(zlib.crc32("penguin"), zlib.crc32("penguin", 0))
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self.assertEqual(zlib.adler32("penguin"),zlib.adler32("penguin",1))
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def test_abcdefghijklmnop(self):
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"""test issue1202 compliance: signed crc32, adler32 in 2.x"""
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foo = 'abcdefghijklmnop'
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# explicitly test signed behavior
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self.assertEqual(zlib.crc32(foo), -1808088941)
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self.assertEqual(zlib.crc32('spam'), 1138425661)
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self.assertEqual(zlib.adler32(foo+foo), -721416943)
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self.assertEqual(zlib.adler32('spam'), 72286642)
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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, 'ERROR', 10)
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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, 0)
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class CompressTestCase(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.decompress(x), data)
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class CompressObjectTestCase(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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data = HAMLET_SCENE * 128
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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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dco = zlib.decompressobj()
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y1 = dco.decompress(x1 + x2)
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y2 = dco.flush()
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self.assertEqual(data, y1 + y2)
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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 = ''.join(bufs)
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dco = zlib.decompressobj()
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y1 = dco.decompress(''.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 = ''.join(bufs)
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self.assertEqual(data, zlib.decompress(combuf))
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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('', dco.unconsumed_tail, ########
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"(A) uct should be '': not %d long" %
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len(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 True:
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chunk = dco.decompress('')
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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('', dco.unconsumed_tail, ########
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"(B) uct should be '': not %d long" %
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len(dco.unconsumed_tail))
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self.assertEqual(data, ''.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 = ''.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.failIf(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, ''.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 = ''.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.failIf(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('', max_length)
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self.failIf(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, ''.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, "", -1)
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self.assertEqual('', 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(''.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.failUnless(co.flush()) # Returns a zlib header
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dco = zlib.decompressobj()
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self.assertEqual(dco.flush(), "") # Returns nothing
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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 = HAMLET_SCENE.swapcase()
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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 = ''.join(bufs0)
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bufs1.append(c1.compress(data1))
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bufs1.append(c1.flush())
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s1 = ''.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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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 = ''.join(bufs0)
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bufs1.append(d1.decompress(comp[32:]))
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s1 = ''.join(bufs1)
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self.assertEqual(s0,s1)
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self.assertEqual(s0,data)
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def test_baddecompresscopy(self):
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# Test copying a compression object in an inconsistent state
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data = zlib.compress(HAMLET_SCENE)
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d = zlib.decompressobj()
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d.decompress(data)
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d.flush()
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self.assertRaises(ValueError, d.copy)
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def genblock(seed, length, step=1024, generator=random):
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"""length-byte stream of random data from a seed (in step-byte blocks)."""
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if seed is not None:
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generator.seed(seed)
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randint = generator.randint
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if length < step or step < 2:
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step = length
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blocks = []
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for i in range(0, length, step):
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blocks.append(''.join([chr(randint(0,255))
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for x in range(step)]))
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return ''.join(blocks)[:length]
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def choose_lines(source, number, seed=None, generator=random):
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"""Return a list of number lines randomly chosen from the source"""
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if seed is not None:
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generator.seed(seed)
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sources = source.split('\n')
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return [generator.choice(sources) for n in range(number)]
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HAMLET_SCENE = """
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LAERTES
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O, fear me not.
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I stay too long: but here my father comes.
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Enter POLONIUS
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A double blessing is a double grace,
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Occasion smiles upon a second leave.
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LORD POLONIUS
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Yet here, Laertes! aboard, aboard, for shame!
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The wind sits in the shoulder of your sail,
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And you are stay'd for. There; my blessing with thee!
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And these few precepts in thy memory
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See thou character. Give thy thoughts no tongue,
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Nor any unproportioned thought his act.
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Be thou familiar, but by no means vulgar.
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Those friends thou hast, and their adoption tried,
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Grapple them to thy soul with hoops of steel;
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But do not dull thy palm with entertainment
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Of each new-hatch'd, unfledged comrade. Beware
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Of entrance to a quarrel, but being in,
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Bear't that the opposed may beware of thee.
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Give every man thy ear, but few thy voice;
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Take each man's censure, but reserve thy judgment.
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Costly thy habit as thy purse can buy,
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But not express'd in fancy; rich, not gaudy;
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For the apparel oft proclaims the man,
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And they in France of the best rank and station
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Are of a most select and generous chief in that.
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Neither a borrower nor a lender be;
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For loan oft loses both itself and friend,
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And borrowing dulls the edge of husbandry.
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This above all: to thine ownself be true,
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And it must follow, as the night the day,
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Thou canst not then be false to any man.
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Farewell: my blessing season this in thee!
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LAERTES
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Most humbly do I take my leave, my lord.
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LORD POLONIUS
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The time invites you; go; your servants tend.
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LAERTES
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Farewell, Ophelia; and remember well
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What I have said to you.
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OPHELIA
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'Tis in my memory lock'd,
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And you yourself shall keep the key of it.
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LAERTES
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Farewell.
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"""
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def test_main():
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test_support.run_unittest(
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ChecksumTestCase,
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ExceptionTestCase,
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CompressTestCase,
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CompressObjectTestCase
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)
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if __name__ == "__main__":
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test_main()
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