boost_1_45_0/libs/iostreams/test/stream_offset_64bit_test.cpp

/*
 * 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.

 * File:        libs/iostreams/test/stream_offset_64bit_test.cpp
 * Date:        Sun Dec 23 21:11:23 MST 2007
 * Copyright:   2007-2008 CodeRage, LLC
 * Author:      Jonathan Turkanis
 * Contact:     turkanis at coderage dot com
 *
 * Tests the functions defined in the header "boost/iostreams/positioning.hpp"
 * with large (64-bit) file offsets.
 */

#include <cstdio>            // fpos_t
#include <iostream>
#include <sstream>
#include <boost/config.hpp>  // BOOST_MSVC
#include <boost/iostreams/detail/ios.hpp>
#include <boost/iostreams/positioning.hpp>
#include <boost/test/test_tools.hpp>
#include <boost/test/unit_test.hpp>

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

#ifdef BOOST_MSVC
# pragma warning(disable:4127)
#endif

void stream_offset_64bit_test()
{
    stream_offset  large_file = (stream_offset) 100 *
                                (stream_offset) 1024 *
                                (stream_offset) 1024 *
                                (stream_offset) 1024;
    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)
    {
        if (off != position_to_offset(offset_to_position(off))) {
            cout << "****************************************\n"
                 << "* sizeof(fpos_t) = " << sizeof(fpos_t) << "\n"
                 << "* sizeof(streamoff) = " << sizeof(streamoff) << "\n"
                 << "* sizeof(stream_offset) = " 
                 << sizeof(stream_offset) << "\n"
                 << "****************************************\n";
            stringstream s;
            s << "off != position_to_offset(offset_to_position(off)) "
                 "failed for (off >> 32) == 0x" 
              << hex
              << static_cast<unsigned int>(off >> 32) 
              << " and (off & 0xFFFFFFFF) == 0x"
              << static_cast<unsigned int>(off & 0xFFFFFFFF)
              << std::endl;
            BOOST_REQUIRE_MESSAGE(0, s.str().c_str());
        }
    }
}

void stream_offset_64bit_test2()
{
    boost::int64_t val = boost::int64_t(1) << 31;
    std::streampos pos = boost::iostreams::offset_to_position(val);
    pos -= 2;
    BOOST_CHECK_EQUAL(val - 2, boost::iostreams::position_to_offset(pos));

    val = -val;
    pos = boost::iostreams::offset_to_position(val);
    pos += 2;
    BOOST_CHECK_EQUAL(val + 2, boost::iostreams::position_to_offset(pos));
}

test_suite* init_unit_test_suite(int, char* [])
{
    test_suite* test = BOOST_TEST_SUITE("stream_offset 64-bit test");
    test->add(BOOST_TEST_CASE(&stream_offset_64bit_test));
    test->add(BOOST_TEST_CASE(&stream_offset_64bit_test2));
    return test;
}