import unittest from test import test_support import zlib import random # print test_support.TESTFN def getbuf(): # This was in the original. Avoid non-repeatable sources. # Left here (unused) in case something wants to be done with it. import imp try: t = imp.find_module('test_zlib') file = t[0] except ImportError: file = open(__file__) buf = file.read() * 8 file.close() return buf class ChecksumTestCase(unittest.TestCase): # checksum test cases def test_crc32start(self): self.assertEqual(zlib.crc32(""), zlib.crc32("", 0)) self.assert_(zlib.crc32("abc", 0xffffffff)) def test_crc32empty(self): self.assertEqual(zlib.crc32("", 0), 0) self.assertEqual(zlib.crc32("", 1), 1) self.assertEqual(zlib.crc32("", 432), 432) def test_adler32start(self): self.assertEqual(zlib.adler32(""), zlib.adler32("", 1)) self.assert_(zlib.adler32("abc", 0xffffffff)) def test_adler32empty(self): self.assertEqual(zlib.adler32("", 0), 0) self.assertEqual(zlib.adler32("", 1), 1) self.assertEqual(zlib.adler32("", 432), 432) def assertEqual32(self, seen, expected): # 32-bit values masked -- checksums on 32- vs 64- bit machines # This is important if bit 31 (0x08000000L) is set. self.assertEqual(seen & 0x0FFFFFFFFL, expected & 0x0FFFFFFFFL) def test_penguins(self): self.assertEqual32(zlib.crc32("penguin", 0), 0x0e5c1a120L) self.assertEqual32(zlib.crc32("penguin", 1), 0x43b6aa94) self.assertEqual32(zlib.adler32("penguin", 0), 0x0bcf02f6) self.assertEqual32(zlib.adler32("penguin", 1), 0x0bd602f7) self.assertEqual(zlib.crc32("penguin"), zlib.crc32("penguin", 0)) self.assertEqual(zlib.adler32("penguin"),zlib.adler32("penguin",1)) class ExceptionTestCase(unittest.TestCase): # make sure we generate some expected errors def test_bigbits(self): # specifying total bits too large causes an error self.assertRaises(zlib.error, zlib.compress, 'ERROR', zlib.MAX_WBITS + 1) def test_badcompressobj(self): # verify failure on building compress object with bad params self.assertRaises(ValueError, zlib.compressobj, 1, zlib.DEFLATED, 0) def test_baddecompressobj(self): # verify failure on building decompress object with bad params self.assertRaises(ValueError, zlib.decompressobj, 0) class CompressTestCase(unittest.TestCase): # Test compression in one go (whole message compression) def test_speech(self): x = zlib.compress(HAMLET_SCENE) self.assertEqual(zlib.decompress(x), HAMLET_SCENE) def test_speech128(self): # compress more data data = HAMLET_SCENE * 128 x = zlib.compress(data) self.assertEqual(zlib.decompress(x), data) class CompressObjectTestCase(unittest.TestCase): # Test compression object def test_pair(self): # straightforward compress/decompress objects data = HAMLET_SCENE * 128 co = zlib.compressobj() x1 = co.compress(data) x2 = co.flush() self.assertRaises(zlib.error, co.flush) # second flush should not work dco = zlib.decompressobj() y1 = dco.decompress(x1 + x2) y2 = dco.flush() self.assertEqual(data, y1 + y2) def test_compressoptions(self): # specify lots of options to compressobj() level = 2 method = zlib.DEFLATED wbits = -12 memlevel = 9 strategy = zlib.Z_FILTERED co = zlib.compressobj(level, method, wbits, memlevel, strategy) x1 = co.compress(HAMLET_SCENE) x2 = co.flush() dco = zlib.decompressobj(wbits) y1 = dco.decompress(x1 + x2) y2 = dco.flush() self.assertEqual(HAMLET_SCENE, y1 + y2) def test_compressincremental(self): # compress object in steps, decompress object as one-shot data = HAMLET_SCENE * 128 co = zlib.compressobj() bufs = [] for i in range(0, len(data), 256): bufs.append(co.compress(data[i:i+256])) bufs.append(co.flush()) combuf = ''.join(bufs) dco = zlib.decompressobj() y1 = dco.decompress(''.join(bufs)) y2 = dco.flush() self.assertEqual(data, y1 + y2) def test_decompinc(self, flush=False, source=None, cx=256, dcx=64): # compress object in steps, decompress object in steps source = source or HAMLET_SCENE data = source * 128 co = zlib.compressobj() bufs = [] for i in range(0, len(data), cx): bufs.append(co.compress(data[i:i+cx])) bufs.append(co.flush()) combuf = ''.join(bufs) self.assertEqual(data, zlib.decompress(combuf)) dco = zlib.decompressobj() bufs = [] for i in range(0, len(combuf), dcx): bufs.append(dco.decompress(combuf[i:i+dcx])) self.assertEqual('', dco.unconsumed_tail, ######## "(A) uct should be '': not %d long" % len(dco.unconsumed_tail)) if flush: bufs.append(dco.flush()) else: while True: chunk = dco.decompress('') if chunk: bufs.append(chunk) else: break self.assertEqual('', dco.unconsumed_tail, ######## "(B) uct should be '': not %d long" % len(dco.unconsumed_tail)) self.assertEqual(data, ''.join(bufs)) # Failure means: "decompressobj with init options failed" def test_decompincflush(self): self.test_decompinc(flush=True) def test_decompimax(self, source=None, cx=256, dcx=64): # compress in steps, decompress in length-restricted steps source = source or HAMLET_SCENE # Check a decompression object with max_length specified data = source * 128 co = zlib.compressobj() bufs = [] for i in range(0, len(data), cx): bufs.append(co.compress(data[i:i+cx])) bufs.append(co.flush()) combuf = ''.join(bufs) self.assertEqual(data, zlib.decompress(combuf), 'compressed data failure') dco = zlib.decompressobj() bufs = [] cb = combuf while cb: #max_length = 1 + len(cb)//10 chunk = dco.decompress(cb, dcx) self.failIf(len(chunk) > dcx, 'chunk too big (%d>%d)' % (len(chunk), dcx)) bufs.append(chunk) cb = dco.unconsumed_tail bufs.append(dco.flush()) self.assertEqual(data, ''.join(bufs), 'Wrong data retrieved') def test_decompressmaxlen(self, flush=False): # Check a decompression object with max_length specified data = HAMLET_SCENE * 128 co = zlib.compressobj() bufs = [] for i in range(0, len(data), 256): bufs.append(co.compress(data[i:i+256])) bufs.append(co.flush()) combuf = ''.join(bufs) self.assertEqual(data, zlib.decompress(combuf), 'compressed data failure') dco = zlib.decompressobj() bufs = [] cb = combuf while cb: max_length = 1 + len(cb)//10 chunk = dco.decompress(cb, max_length) self.failIf(len(chunk) > max_length, 'chunk too big (%d>%d)' % (len(chunk),max_length)) bufs.append(chunk) cb = dco.unconsumed_tail if flush: bufs.append(dco.flush()) else: while chunk: chunk = dco.decompress('', max_length) self.failIf(len(chunk) > max_length, 'chunk too big (%d>%d)' % (len(chunk),max_length)) bufs.append(chunk) self.assertEqual(data, ''.join(bufs), 'Wrong data retrieved') def test_decompressmaxlenflush(self): self.test_decompressmaxlen(flush=True) def test_maxlenmisc(self): # Misc tests of max_length dco = zlib.decompressobj() self.assertRaises(ValueError, dco.decompress, "", -1) self.assertEqual('', dco.unconsumed_tail) def test_flushes(self): # Test flush() with the various options, using all the # different levels in order to provide more variations. sync_opt = ['Z_NO_FLUSH', 'Z_SYNC_FLUSH', 'Z_FULL_FLUSH'] sync_opt = [getattr(zlib, opt) for opt in sync_opt if hasattr(zlib, opt)] data = HAMLET_SCENE * 8 for sync in sync_opt: for level in range(10): obj = zlib.compressobj( level ) a = obj.compress( data[:3000] ) b = obj.flush( sync ) c = obj.compress( data[3000:] ) d = obj.flush() self.assertEqual(zlib.decompress(''.join([a,b,c,d])), data, ("Decompress failed: flush " "mode=%i, level=%i") % (sync, level)) del obj def test_odd_flush(self): # Test for odd flushing bugs noted in 2.0, and hopefully fixed in 2.1 import random if hasattr(zlib, 'Z_SYNC_FLUSH'): # Testing on 17K of "random" data # Create compressor and decompressor objects co = zlib.compressobj(zlib.Z_BEST_COMPRESSION) dco = zlib.decompressobj() # Try 17K of data # generate random data stream try: # In 2.3 and later, WichmannHill is the RNG of the bug report gen = random.WichmannHill() except AttributeError: try: # 2.2 called it Random gen = random.Random() except AttributeError: # others might simply have a single RNG gen = random gen.seed(1) data = genblock(1, 17 * 1024, generator=gen) # compress, sync-flush, and decompress first = co.compress(data) second = co.flush(zlib.Z_SYNC_FLUSH) expanded = dco.decompress(first + second) # if decompressed data is different from the input data, choke. self.assertEqual(expanded, data, "17K random source doesn't match") def test_empty_flush(self): # Test that calling .flush() on unused objects works. # (Bug #1083110 -- calling .flush() on decompress objects # caused a core dump.) co = zlib.compressobj(zlib.Z_BEST_COMPRESSION) self.failUnless(co.flush()) # Returns a zlib header dco = zlib.decompressobj() self.assertEqual(dco.flush(), "") # Returns nothing 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 = [] for i in range(0, length, step): blocks.append(''.join([chr(randint(0,255)) for x in range(step)])) return ''.join(blocks)[:length] 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 = """ 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(): test_support.run_unittest( ChecksumTestCase, ExceptionTestCase, CompressTestCase, CompressObjectTestCase ) if __name__ == "__main__": test_main() def test(tests=''): if not tests: tests = 'o' testcases = [] if 'k' in tests: testcases.append(ChecksumTestCase) if 'x' in tests: testcases.append(ExceptionTestCase) if 'c' in tests: testcases.append(CompressTestCase) if 'o' in tests: testcases.append(CompressObjectTestCase) test_support.run_unittest(*testcases) if False: import sys sys.path.insert(1, '/Py23Src/python/dist/src/Lib/test') import test_zlib as tz ts, ut = tz.test_support, tz.unittest su = ut.TestSuite() su.addTest(ut.makeSuite(tz.CompressTestCase)) ts.run_suite(su)