1 #! /usr/bin/env python

     2 """Test script for the gzip module.

     3 """

     4 

     5 import unittest

     6 from test import test_support

     7 import os

     8 import gzip

     9 

    10 

    11 data1 = """  int length=DEFAULTALLOC, err = Z_OK;

    12   PyObject *RetVal;

    13   int flushmode = Z_FINISH;

    14   unsigned long start_total_out;

    15 

    16 """

    17 

    18 data2 = """/* zlibmodule.c -- gzip-compatible data compression */

    19 /* See http://www.gzip.org/zlib/

    20 /* See http://www.winimage.com/zLibDll for Windows */

    21 """

    22 

    23 

    24 class TestGzip(unittest.TestCase):

    25     filename = test_support.TESTFN

    26 

    27     def setUp(self):

    28         test_support.unlink(self.filename)

    29 

    30     def tearDown(self):

    31         test_support.unlink(self.filename)

    32 

    33 

    34     def test_write(self):

    35         f = gzip.GzipFile(self.filename, 'wb') ; f.write(data1 * 50)

    36 

    37         # Try flush and fileno.

    38         f.flush()

    39         f.fileno()

    40         if hasattr(os, 'fsync'):

    41             os.fsync(f.fileno())

    42         f.close()

    43 

    44         # Test multiple close() calls.

    45         f.close()

    46 

    47     def test_read(self):

    48         self.test_write()

    49         # Try reading.

    50         f = gzip.GzipFile(self.filename, 'r') ; d = f.read() ; f.close()

    51         self.assertEqual(d, data1*50)

    52 

    53     def test_append(self):

    54         self.test_write()

    55         # Append to the previous file

    56         f = gzip.GzipFile(self.filename, 'ab') ; f.write(data2 * 15) ; f.close()

    57 

    58         f = gzip.GzipFile(self.filename, 'rb') ; d = f.read() ; f.close()

    59         self.assertEqual(d, (data1*50) + (data2*15))

    60 

    61     def test_many_append(self):

    62         # Bug #1074261 was triggered when reading a file that contained

    63         # many, many members.  Create such a file and verify that reading it

    64         # works.

    65         f = gzip.open(self.filename, 'wb', 9)

    66         f.write('a')

    67         f.close()

    68         for i in range(0,200):

    69             f = gzip.open(self.filename, "ab", 9) # append

    70             f.write('a')

    71             f.close()

    72 

    73         # Try reading the file

    74         zgfile = gzip.open(self.filename, "rb")

    75         contents = ""

    76         while 1:

    77             ztxt = zgfile.read(8192)

    78             contents += ztxt

    79             if not ztxt: break

    80         zgfile.close()

    81         self.assertEquals(contents, 'a'*201)

    82 

    83 

    84     def test_readline(self):

    85         self.test_write()

    86         # Try .readline() with varying line lengths

    87 

    88         f = gzip.GzipFile(self.filename, 'rb')

    89         line_length = 0

    90         while 1:

    91             L = f.readline(line_length)

    92             if L == "" and line_length != 0: break

    93             self.assert_(len(L) <= line_length)

    94             line_length = (line_length + 1) % 50

    95         f.close()

    96 

    97     def test_readlines(self):

    98         self.test_write()

    99         # Try .readlines()

   100 

   101         f = gzip.GzipFile(self.filename, 'rb')

   102         L = f.readlines()

   103         f.close()

   104 

   105         f = gzip.GzipFile(self.filename, 'rb')

   106         while 1:

   107             L = f.readlines(150)

   108             if L == []: break

   109         f.close()

   110 

   111     def test_seek_read(self):

   112         self.test_write()

   113         # Try seek, read test

   114 

   115         f = gzip.GzipFile(self.filename)

   116         while 1:

   117             oldpos = f.tell()

   118             line1 = f.readline()

   119             if not line1: break

   120             newpos = f.tell()

   121             f.seek(oldpos)  # negative seek

   122             if len(line1)>10:

   123                 amount = 10

   124             else:

   125                 amount = len(line1)

   126             line2 = f.read(amount)

   127             self.assertEqual(line1[:amount], line2)

   128             f.seek(newpos)  # positive seek

   129         f.close()

   130 

   131     def test_seek_whence(self):

   132         self.test_write()

   133         # Try seek(whence=1), read test

   134 

   135         f = gzip.GzipFile(self.filename)

   136         f.read(10)

   137         f.seek(10, whence=1)

   138         y = f.read(10)

   139         f.close()

   140         self.assertEquals(y, data1[20:30])

   141 

   142     def test_seek_write(self):

   143         # Try seek, write test

   144         f = gzip.GzipFile(self.filename, 'w')

   145         for pos in range(0, 256, 16):

   146             f.seek(pos)

   147             f.write('GZ\n')

   148         f.close()

   149 

   150     def test_mode(self):

   151         self.test_write()

   152         f = gzip.GzipFile(self.filename, 'r')

   153         self.assertEqual(f.myfileobj.mode, 'rb')

   154         f.close()

   155 

   156     def test_1647484(self):

   157         for mode in ('wb', 'rb'):

   158             f = gzip.GzipFile(self.filename, mode)

   159             self.assert_(hasattr(f, "name"))

   160             self.assertEqual(f.name, self.filename)

   161             f.close()

   162 

   163 def test_main(verbose=None):

   164     test_support.run_unittest(TestGzip)

   165 

   166 if __name__ == "__main__":

   167     test_main(verbose=True)