| import unittest |
| from test import support |
| import binascii |
| import random |
| |
| 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, 0) |
| |
| 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 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.compress(bytearray(data)), x) |
| for ob in x, bytearray(x): |
| self.assertEqual(zlib.decompress(ob), data) |
| |
| |
| |
| class CompressObjectTestCase(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 |
| |
| 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) |
| |
| 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() |