#! /usr/bin/env python

"""Test script for the gzip module.

"""

import unittest

from test import test_support

import sys, os

import gzip

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

  PyObject *RetVal;

  int flushmode = Z_FINISH;

  unsigned long start_total_out;

"""

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

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

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

"""

class TestGzip(unittest.TestCase):

    filename = test_support.TESTFN

    def setUp (self):

        pass

    def tearDown (self):

        try:

            os.unlink(self.filename)

        except os.error:

            pass

    def test_write (self):

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

        # Try flush and fileno.

        f.flush()

        f.fileno()

        if hasattr(os, 'fsync'):

            os.fsync(f.fileno())

        f.close()

    def test_read(self):

        self.test_write()

        # Try reading.

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

        self.assertEqual(d, data1*50)

    def test_append(self):

        self.test_write()

        # Append to the previous file

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

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

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

    def test_many_append(self):

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

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

        # works.

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

        f.write('a')

        f.close()

        for i in range(0,200):

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

            f.write('a')

            f.close()

        # Try reading the file

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

        contents = ""

        while 1:

            ztxt = zgfile.read(8192)

            contents += ztxt

            if not ztxt: break

        zgfile.close()

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

    def test_readline(self):

        self.test_write()

        # Try .readline() with varying line lengths

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

        line_length = 0

        while 1:

            L = f.readline(line_length)

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

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

            line_length = (line_length + 1) % 50

        f.close()

    def test_readlines(self):

        self.test_write()

        # Try .readlines()

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

        L = f.readlines()

        f.close()

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

        while 1:

            L = f.readlines(150)

            if L == []: break

        f.close()

    def test_seek_read(self):

        self.test_write()

        # Try seek, read test

        f = gzip.GzipFile(self.filename)

        while 1:

            oldpos = f.tell()

            line1 = f.readline()

            if not line1: break

            newpos = f.tell()

            f.seek(oldpos)  # negative seek

            if len(line1)>10:

                amount = 10

            else:

                amount = len(line1)

            line2 = f.read(amount)

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

            f.seek(newpos)  # positive seek

        f.close()

    def test_seek_write(self):

        # Try seek, write test

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

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

            f.seek(pos)

            f.write('GZ\n')

        f.close()

    def test_mode(self):

        self.test_write()

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

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

        f.close()

def test_main(verbose=None):

    test_support.run_unittest(TestGzip)

if __name__ == "__main__":

    test_main(verbose=True)