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77 lines
3.2 KiB
77 lines
3.2 KiB
#!/usr/bin/env python
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import unittest
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from pyutil import randutil
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from pyutil import zlibutil
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class Accumulator:
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def __init__(self):
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self.buf = ''
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def write(self, str):
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self.buf += str
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def make_decomp(realdecomp):
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def decomp(str, maxlen, maxmem):
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d = Accumulator()
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realdecomp(str, d, maxlen, maxmem)
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return d.buf
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return decomp
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def genrandstr(strlen):
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return randutil.insecurerandstr(strlen)
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def genbombstr(strlen):
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return '0' * strlen
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MAXMEM=65*2**20
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class ZlibTestCase(unittest.TestCase):
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def _help_test(self, genstring, decomp, strlen):
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s = genstring(strlen)
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cs = zlibutil.zlib.compress(s)
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s2 = decomp(cs, maxlen=strlen, maxmem=strlen*2**3 + zlibutil.MINMAXMEM)
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self.failUnless(s == s2)
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s2 = decomp(cs, maxlen=strlen, maxmem=strlen*2**6 + zlibutil.MINMAXMEM)
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self.failUnless(s == s2)
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self.failUnlessRaises(zlibutil.TooBigError, decomp, cs, maxlen=strlen-1, maxmem=strlen*2**3 + zlibutil.MINMAXMEM)
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def _help_test_inplace_minmaxmem(self, genstring, decomp, strlen):
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s = genstring(strlen)
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cs = zlibutil.zlib.compress(s)
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s2 = decomp(cs, maxlen=strlen, maxmem=zlibutil.MINMAXMEM)
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self.failUnless(s == s2)
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self.failUnlessRaises(zlibutil.TooBigError, decomp, cs, maxlen=strlen-1, maxmem=zlibutil.MINMAXMEM)
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def _help_test_inplace(self, genstring, decomp, strlen):
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# ### XXX self.failUnlessRaises(UnsafeDecompressError, decomp, zlib.compress(genstring(strlen)), maxlen=strlen, maxmem=strlen-1)
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s = genstring(strlen)
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cs = zlibutil.zlib.compress(s)
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s2 = decomp(cs, maxlen=strlen, maxmem=max(strlen*2**3, zlibutil.MINMAXMEM))
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self.failUnless(s == s2)
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s2 = decomp(cs, maxlen=strlen, maxmem=max(strlen*2**6, zlibutil.MINMAXMEM))
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self.failUnless(s == s2)
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s2 = decomp(cs, maxlen=strlen, maxmem=max(strlen-1, zlibutil.MINMAXMEM))
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self.failUnless(s == s2)
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s2 = decomp(cs, maxlen=strlen, maxmem=max(strlen/2, zlibutil.MINMAXMEM))
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self.failUnless(s == s2)
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self.failUnlessRaises(zlibutil.TooBigError, decomp, cs, maxlen=strlen-1, maxmem=max(strlen*2**3, zlibutil.MINMAXMEM))
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def testem(self):
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# for strlen in [2**1, 2**2, 2**10, 2**14, 2**21]: # a *real* test ought to include 2**21, which exercises different cases re: maxmem. But it takes too long.
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for strlen in [2, 3, 4, 99,]:
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# print "strlen: %s\n" % (strlen,)
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for decomp in [zlibutil.decompress, make_decomp(zlibutil.decompress_to_fileobj), make_decomp(zlibutil.decompress_to_spool),]:
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# print "decomp: %s\n" % (decomp,)
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for genstring in [genrandstr, genbombstr,]:
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# print "genstring: %s\n" % (genstring,)
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self._help_test(genstring, decomp, strlen)
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for decomp in [make_decomp(zlibutil.decompress_to_spool),]:
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# print "decomp: %s\n" % (decomp,)
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for genstring in [genrandstr, genbombstr,]:
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# print "genstring: %s\n" % (genstring,)
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self._help_test_inplace(genstring, decomp, strlen)
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self._help_test_inplace_minmaxmem(genstring, decomp, strlen)
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