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#!/usr/bin/env python
# -*- coding: utf-8-with-signature-unix; fill-column: 77 -*-
# -*- indent-tabs-mode: nil -*-
# This file is part of pyutil; see README.rst for licensing terms.
import unittest
from pyutil import randutil
from pyutil import zlibutil
class Accumulator:
def __init__(self):
self.buf = b''
def write(self, str):
self.buf += str
def make_decomp(realdecomp):
def decomp(str, maxlen, maxmem):
d = Accumulator()
realdecomp(str, d, maxlen, maxmem)
return d.buf
return decomp
def genrandstr(strlen):
return randutil.insecurerandstr(strlen)
def genbombstr(strlen):
return b'0' * strlen
MAXMEM=65*2**20
class ZlibTestCase(unittest.TestCase):
def _help_test(self, genstring, decomp, strlen):
s = genstring(strlen)
cs = zlibutil.zlib.compress(s)
s2 = decomp(cs, maxlen=strlen, maxmem=strlen*2**3 + zlibutil.MINMAXMEM)
self.assertTrue(s == s2)
s2 = decomp(cs, maxlen=strlen, maxmem=strlen*2**6 + zlibutil.MINMAXMEM)
self.assertTrue(s == s2)
self.assertRaises(zlibutil.TooBigError, decomp, cs, maxlen=strlen-1, maxmem=strlen*2**3 + zlibutil.MINMAXMEM)
def _help_test_inplace_minmaxmem(self, genstring, decomp, strlen):
s = genstring(strlen)
cs = zlibutil.zlib.compress(s)
s2 = decomp(cs, maxlen=strlen, maxmem=zlibutil.MINMAXMEM)
self.assertTrue(s == s2)
self.assertRaises(zlibutil.TooBigError, decomp, cs, maxlen=strlen-1, maxmem=zlibutil.MINMAXMEM)
def _help_test_inplace(self, genstring, decomp, strlen):
# ### XXX self.assertRaises(UnsafeDecompressError, decomp, zlib.compress(genstring(strlen)), maxlen=strlen, maxmem=strlen-1)
s = genstring(strlen)
cs = zlibutil.zlib.compress(s)
s2 = decomp(cs, maxlen=strlen, maxmem=max(strlen*2**3, zlibutil.MINMAXMEM))
self.assertTrue(s == s2)
s2 = decomp(cs, maxlen=strlen, maxmem=max(strlen*2**6, zlibutil.MINMAXMEM))
self.assertTrue(s == s2)
s2 = decomp(cs, maxlen=strlen, maxmem=max(strlen-1, zlibutil.MINMAXMEM))
self.assertTrue(s == s2)
s2 = decomp(cs, maxlen=strlen, maxmem=max(strlen/2, zlibutil.MINMAXMEM))
self.assertTrue(s == s2)
self.assertRaises(zlibutil.TooBigError, decomp, cs, maxlen=strlen-1, maxmem=max(strlen*2**3, zlibutil.MINMAXMEM))
def testem(self):
# 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.
for strlen in [2, 3, 4, 99,]:
# print "strlen: %s\n" % (strlen,)
for decomp in [zlibutil.decompress, make_decomp(zlibutil.decompress_to_fileobj), make_decomp(zlibutil.decompress_to_spool),]:
# print "decomp: %s\n" % (decomp,)
for genstring in [genrandstr, genbombstr,]:
# print "genstring: %s\n" % (genstring,)
self._help_test(genstring, decomp, strlen)
for decomp in [make_decomp(zlibutil.decompress_to_spool),]:
# print "decomp: %s\n" % (decomp,)
for genstring in [genrandstr, genbombstr,]:
# print "genstring: %s\n" % (genstring,)
self._help_test_inplace(genstring, decomp, strlen)
self._help_test_inplace_minmaxmem(genstring, decomp, strlen)
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