import unittest from test import support import binascii import random from test.support import precisionbigmemtest, _1G, _4G zlib = support.import_module('zlib') class ChecksumTestCase(unittest.TestCase): # checksum test cases def test_crc32start(self): self.assertEqual(zlib.crc32(b""), zlib.crc32(b"", 0)) self.assertTrue(zlib.crc32(b"abc", 0xffffffff)) def test_crc32empty(self): self.assertEqual(zlib.crc32(b"", 0), 0) self.assertEqual(zlib.crc32(b"", 1), 1) self.assertEqual(zlib.crc32(b"", 432), 432) def test_adler32start(self): self.assertEqual(zlib.adler32(b""), zlib.adler32(b"", 1)) self.assertTrue(zlib.adler32(b"abc", 0xffffffff)) def test_adler32empty(self): self.assertEqual(zlib.adler32(b"", 0), 0) self.assertEqual(zlib.adler32(b"", 1), 1) self.assertEqual(zlib.adler32(b"", 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 & 0x0FFFFFFFF, expected & 0x0FFFFFFFF) def test_penguins(self): self.assertEqual32(zlib.crc32(b"penguin", 0), 0x0e5c1a120) self.assertEqual32(zlib.crc32(b"penguin", 1), 0x43b6aa94) self.assertEqual32(zlib.adler32(b"penguin", 0), 0x0bcf02f6) self.assertEqual32(zlib.adler32(b"penguin", 1), 0x0bd602f7) self.assertEqual(zlib.crc32(b"penguin"), zlib.crc32(b"penguin", 0)) self.assertEqual(zlib.adler32(b"penguin"),zlib.adler32(b"penguin",1)) def test_crc32_adler32_unsigned(self): foo = b'abcdefghijklmnop' # explicitly test signed behavior self.assertEqual(zlib.crc32(foo), 2486878355) self.assertEqual(zlib.crc32(b'spam'), 1138425661) self.assertEqual(zlib.adler32(foo+foo), 3573550353) self.assertEqual(zlib.adler32(b'spam'), 72286642) def test_same_as_binascii_crc32(self): foo = b'abcdefghijklmnop' crc = 2486878355 self.assertEqual(binascii.crc32(foo), crc) self.assertEqual(zlib.crc32(foo), crc) self.assertEqual(binascii.crc32(b'spam'), zlib.crc32(b'spam')) class ExceptionTestCase(unittest.TestCase): # make sure we generate some expected errors def test_badlevel(self): # specifying compression level out of range causes an error # (but -1 is Z_DEFAULT_COMPRESSION and apparently the zlib # accepts 0 too) self.assertRaises(zlib.error, zlib.compress, b'ERROR', 10) def test_badargs(self): self.assertRaises(TypeError, zlib.adler32) self.assertRaises(TypeError, zlib.crc32) self.assertRaises(TypeError, zlib.compress) self.assertRaises(TypeError, zlib.decompress) for arg in (42, None, '', 'abc', (), []): self.assertRaises(TypeError, zlib.adler32, arg) self.assertRaises(TypeError, zlib.crc32, arg) self.assertRaises(TypeError, zlib.compress, arg) self.assertRaises(TypeError, zlib.decompress, arg) def test_badcompressobj(self): # verify failure on building compress object with bad params self.assertRaises(ValueError, zlib.compressobj, 1, zlib.DEFLATED, 0) # specifying total bits too large causes an error self.assertRaises(ValueError, zlib.compressobj, 1, zlib.DEFLATED, zlib.MAX_WBITS + 1) def test_baddecompressobj(self): # verify failure on building decompress object with bad params self.assertRaises(ValueError, zlib.decompressobj, -1) def test_decompressobj_badflush(self): # verify failure on calling decompressobj.flush with bad params self.assertRaises(ValueError, zlib.decompressobj().flush, 0) self.assertRaises(ValueError, zlib.decompressobj().flush, -1) class BaseCompressTestCase(object): def check_big_compress_buffer(self, size, compress_func): _1M = 1024 * 1024 fmt = "%%0%dx" % (2 * _1M) # Generate 10MB worth of random, and expand it by repeating it. # The assumption is that zlib's memory is not big enough to exploit # such spread out redundancy. data = b''.join([random.getrandbits(8 * _1M).to_bytes(_1M, 'little') for i in range(10)]) data = data * (size // len(data) + 1) try: compress_func(data) finally: # Release memory data = None def check_big_decompress_buffer(self, size, decompress_func): data = b'x' * size try: compressed = zlib.compress(data, 1) finally: # Release memory data = None data = decompress_func(compressed) # Sanity check try: self.assertEqual(len(data), size) self.assertEqual(len(data.strip(b'x')), 0) finally: data = None class CompressTestCase(BaseCompressTestCase, 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.compress(bytearray(data)), x) for ob in x, bytearray(x): self.assertEqual(zlib.decompress(ob), data) def test_incomplete_stream(self): # An useful error message is given x = zlib.compress(HAMLET_SCENE) self.assertRaisesRegex(zlib.error, "Error -5 while decompressing data: incomplete or truncated stream", zlib.decompress, x[:-1]) # Memory use of the following functions takes into account overallocation @precisionbigmemtest(size=_1G + 1024 * 1024, memuse=3) def test_big_compress_buffer(self, size): compress = lambda s: zlib.compress(s, 1) self.check_big_compress_buffer(size, compress) @precisionbigmemtest(size=_1G + 1024 * 1024, memuse=2) def test_big_decompress_buffer(self, size): self.check_big_decompress_buffer(size, zlib.decompress) @precisionbigmemtest(size=_4G + 100, memuse=1) def test_length_overflow(self, size): if size < _4G + 100: self.skipTest("not enough free memory, need at least 4 GB") data = b'x' * size try: self.assertRaises(OverflowError, zlib.compress, data, 1) finally: data = None class CompressObjectTestCase(BaseCompressTestCase, unittest.TestCase): # Test compression object def test_pair(self): # straightforward compress/decompress objects datasrc = HAMLET_SCENE * 128 datazip = zlib.compress(datasrc) # should compress both bytes and bytearray data for data in (datasrc, bytearray(datasrc)): co = zlib.compressobj() x1 = co.compress(data) x2 = co.flush() self.assertRaises(zlib.error, co.flush) # second flush should not work self.assertEqual(x1 + x2, datazip) for v1, v2 in ((x1, x2), (bytearray(x1), bytearray(x2))): dco = zlib.decompressobj() y1 = dco.decompress(v1 + v2) y2 = dco.flush() self.assertEqual(data, y1 + y2) self.assertIsInstance(dco.unconsumed_tail, bytes) self.assertIsInstance(dco.unused_data, bytes) 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 = b''.join(bufs) dco = zlib.decompressobj() y1 = dco.decompress(b''.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 = b''.join(bufs) decombuf = zlib.decompress(combuf) # Test type of return value self.assertIsInstance(decombuf, bytes) self.assertEqual(data, decombuf) dco = zlib.decompressobj() bufs = [] for i in range(0, len(combuf), dcx): bufs.append(dco.decompress(combuf[i:i+dcx])) self.assertEqual(b'', dco.unconsumed_tail, ######## "(A) uct should be b'': not %d long" % len(dco.unconsumed_tail)) self.assertEqual(b'', dco.unused_data) if flush: bufs.append(dco.flush()) else: while True: chunk = dco.decompress(b'') if chunk: bufs.append(chunk) else: break self.assertEqual(b'', dco.unconsumed_tail, ######## "(B) uct should be b'': not %d long" % len(dco.unconsumed_tail)) self.assertEqual(b'', dco.unused_data) self.assertEqual(data, b''.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 = b''.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.assertFalse(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, b''.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 = b''.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.assertFalse(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(b'', max_length) self.assertFalse(len(chunk) > max_length, 'chunk too big (%d>%d)' % (len(chunk),max_length)) bufs.append(chunk) self.assertEqual(data, b''.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, b"", -1) self.assertEqual(b'', 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(b''.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.assertTrue(co.flush()) # Returns a zlib header dco = zlib.decompressobj() self.assertEqual(dco.flush(), b"") # Returns nothing def test_decompress_incomplete_stream(self): # This is 'foo', deflated x = b'x\x9cK\xcb\xcf\x07\x00\x02\x82\x01E' # For the record self.assertEqual(zlib.decompress(x), b'foo') self.assertRaises(zlib.error, zlib.decompress, x[:-5]) # Omitting the stream end works with decompressor objects # (see issue #8672). dco = zlib.decompressobj() y = dco.decompress(x[:-5]) y += dco.flush() self.assertEqual(y, b'foo') if hasattr(zlib.compressobj(), "copy"): def test_compresscopy(self): # Test copying a compression object data0 = HAMLET_SCENE data1 = bytes(str(HAMLET_SCENE, "ascii").swapcase(), "ascii") c0 = zlib.compressobj(zlib.Z_BEST_COMPRESSION) bufs0 = [] bufs0.append(c0.compress(data0)) c1 = c0.copy() bufs1 = bufs0[:] bufs0.append(c0.compress(data0)) bufs0.append(c0.flush()) s0 = b''.join(bufs0) bufs1.append(c1.compress(data1)) bufs1.append(c1.flush()) s1 = b''.join(bufs1) self.assertEqual(zlib.decompress(s0),data0+data0) self.assertEqual(zlib.decompress(s1),data0+data1) def test_badcompresscopy(self): # Test copying a compression object in an inconsistent state c = zlib.compressobj() c.compress(HAMLET_SCENE) c.flush() self.assertRaises(ValueError, c.copy) if hasattr(zlib.decompressobj(), "copy"): def test_decompresscopy(self): # Test copying a decompression object data = HAMLET_SCENE comp = zlib.compress(data) # Test type of return value self.assertIsInstance(comp, bytes) d0 = zlib.decompressobj() bufs0 = [] bufs0.append(d0.decompress(comp[:32])) d1 = d0.copy() bufs1 = bufs0[:] bufs0.append(d0.decompress(comp[32:])) s0 = b''.join(bufs0) 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()