source: downloads/boost_1_34_1/libs/iostreams/test/positioning_test.cpp @ 29

// (C) Copyright Jonathan Turkanis 2005
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)

// See http://www.boost.org/libs/iostreams for documentation.

#include <boost/iostreams/detail/ios.hpp>
#include <boost/iostreams/positioning.hpp>
#include <boost/integer_traits.hpp>
#include <boost/test/test_tools.hpp>
#include <boost/test/unit_test.hpp>

#include <iostream>

using namespace std;
using namespace boost;
using namespace boost::iostreams;
using boost::unit_test::test_suite;

//void extrema_test_test()
//{
//    stream_offset minoff = integer_traits<stream_offset>::const_min;
//    stream_offset maxoff = integer_traits<stream_offset>::const_max;
//
//    BOOST_CHECK(minoff == position_to_offset(offset_to_position(minoff)));
//    BOOST_CHECK(0 == position_to_offset(offset_to_position(0)));
//    BOOST_CHECK(maxoff == position_to_offset(offset_to_position(maxoff)));
//}

void large_file_test()
{
    stream_offset  large_file = 100 * 1024 * 1024 * 1024; // 100GB.
    stream_offset  first = -large_file - (-large_file) % 10000000;
    stream_offset  last = large_file - large_file % 10000000;

    for (stream_offset off = first; off < last; off += 10000000)
    {
        BOOST_CHECK(off == position_to_offset(offset_to_position(off)));
    }
}

void small_file_test()
{
    stream_offset  small_file = 1000000;
    stream_offset  off = -small_file;
    streampos      pos = offset_to_position(off);

    while (off < small_file)
    {
        BOOST_CHECK(off == position_to_offset(offset_to_position(off)));
        BOOST_CHECK(pos == offset_to_position(position_to_offset(pos)));
        off += 20000;
        pos += 20000;
        BOOST_CHECK(off == position_to_offset(offset_to_position(off)));
        BOOST_CHECK(pos == offset_to_position(position_to_offset(pos)));
        off -= 10000;
        pos -= 10000;
    }
}

test_suite* init_unit_test_suite(int, char* [])
{
    test_suite* test = BOOST_TEST_SUITE("positioning test");
    //test->add(BOOST_TEST_CASE(&extrema_test_test));
    test->add(BOOST_TEST_CASE(&large_file_test));
    test->add(BOOST_TEST_CASE(&small_file_test));
    return test;
}