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161 lines
4.3 KiB
Python
161 lines
4.3 KiB
Python
import zlib
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import sys
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import imp
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import string
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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 = string.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 = string.join(buf, '')
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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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for sync in [zlib.Z_NO_FLUSH, zlib.Z_SYNC_FLUSH, zlib.Z_FULL_FLUSH]:
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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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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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