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fcfc8d5c0e
available in java, so only use the advanced flush options if they are defined in the zlib module.
191 lines
5.1 KiB
Python
191 lines
5.1 KiB
Python
import zlib
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from test_support import TestFailed
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import sys
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import imp
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try:
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t = imp.find_module('test_zlib')
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file = t[0]
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except ImportError:
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file = open(__file__)
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buf = file.read() * 8
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file.close()
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# test the checksums (hex so the test doesn't break on 64-bit machines)
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print hex(zlib.crc32('penguin')), hex(zlib.crc32('penguin', 1))
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print hex(zlib.adler32('penguin')), hex(zlib.adler32('penguin', 1))
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# make sure we generate some expected errors
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try:
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zlib.compress('ERROR', zlib.MAX_WBITS + 1)
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except zlib.error, msg:
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print "expecting", msg
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try:
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zlib.compressobj(1, 8, 0)
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except ValueError, msg:
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print "expecting", msg
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try:
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zlib.decompressobj(0)
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except ValueError, msg:
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print "expecting", msg
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x = zlib.compress(buf)
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y = zlib.decompress(x)
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if buf != y:
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print "normal compression/decompression failed"
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else:
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print "normal compression/decompression succeeded"
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buf = buf * 16
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co = zlib.compressobj(8, 8, -15)
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x1 = co.compress(buf)
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x2 = co.flush()
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x = x1 + x2
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dc = zlib.decompressobj(-15)
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y1 = dc.decompress(x)
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y2 = dc.flush()
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y = y1 + y2
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if buf != y:
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print "compress/decompression obj failed"
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else:
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print "compress/decompression obj succeeded"
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co = zlib.compressobj(2, 8, -12, 9, 1)
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bufs = []
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for i in range(0, len(buf), 256):
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bufs.append(co.compress(buf[i:i+256]))
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bufs.append(co.flush())
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combuf = ''.join(bufs)
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decomp1 = zlib.decompress(combuf, -12, -5)
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if decomp1 != buf:
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print "decompress with init options failed"
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else:
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print "decompress with init options succeeded"
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deco = zlib.decompressobj(-12)
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bufs = []
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for i in range(0, len(combuf), 128):
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bufs.append(deco.decompress(combuf[i:i+128]))
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bufs.append(deco.flush())
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decomp2 = ''.join(bufs)
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if decomp2 != buf:
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print "decompressobj with init options failed"
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else:
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print "decompressobj with init options succeeded"
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# Test flush() with the various options, using all the different levels
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# 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 if hasattr(zlib, opt)]
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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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d = obj.compress( buf[:3000] )
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d = d + obj.flush( sync )
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d = d + obj.compress( buf[3000:] )
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d = d + obj.flush()
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if zlib.decompress(d) != buf:
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print "Decompress failed: flush mode=%i, level=%i" % (sync,level)
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del obj
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# Test for the odd flushing bugs noted in 2.0, and hopefully fixed in 2.1
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import random
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random.seed(1)
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print 'Testing on 17K of random data'
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if hasattr(zlib, 'Z_SYNC_FLUSH'):
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# Create compressor and decompressor objects
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c=zlib.compressobj(9)
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d=zlib.decompressobj()
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# Try 17K of data
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# generate random data stream
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a=""
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for i in range(17*1024):
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a=a+chr(random.randint(0,255))
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# compress, sync-flush, and decompress
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t = d.decompress( c.compress(a)+c.flush(zlib.Z_SYNC_FLUSH) )
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# if decompressed data is different from the input data, choke.
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if len(t) != len(a):
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print len(a),len(t),len(d.unused_data)
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raise TestFailed, "output of 17K doesn't match"
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def ignore():
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"""An empty function with a big string.
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Make the compression algorithm work a little harder.
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"""
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"""
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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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