restrict_test.cpp

C++的一个好库。。。现在很流行

// (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.

// Todo: add tests for direct devices.

#include <algorithm>  // equal.
#include <cctype>
#include <iterator>   // back_inserter.
#include <vector>
#include <boost/iostreams/copy.hpp>
#include <boost/iostreams/device/file.hpp>
#include <boost/iostreams/device/null.hpp>
#include <boost/iostreams/filtering_stream.hpp>
#include <boost/iostreams/restrict.hpp>
#include <boost/test/test_tools.hpp>
#include <boost/test/unit_test.hpp>
#include "detail/constants.hpp"
#include "detail/filters.hpp"
#include "detail/sequence.hpp"
#include "detail/temp_file.hpp"
#include "detail/verification.hpp"

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

const char pad_char = '\n';
const int small_padding = 50;
const int large_padding = default_device_buffer_size + 50;

void write_padding(std::ofstream& out, int len)
{
    for (int z = 0; z < len; ++z)
        out.put(pad_char);
}

struct restricted_test_file : public temp_file {
    restricted_test_file(int padding, bool half_open = false)
        {
            BOOST_IOS::openmode mode = 
                BOOST_IOS::out | BOOST_IOS::binary;
            ::std::ofstream f(name().c_str(), mode);
            write_padding(f, padding);
            const char* buf = narrow_data();
            for (int z = 0; z < data_reps; ++z)
                f.write(buf, data_length());
            if (!half_open)
                write_padding(f, padding);
        }
};

struct restricted_test_sequence : public std::vector<char> {
    restricted_test_sequence(int padding, bool half_open = false)
        {
            for (int z = 0; z < padding; ++z)
                push_back(pad_char);
            const char* buf = narrow_data();
            for (int w = 0; w < data_reps; ++w)
                insert(end(), buf, buf + data_length());
            if (!half_open)
                for (int x = 0; x < padding; ++x)
                    push_back(pad_char);
        }
};

struct restricted_uppercase_file : public temp_file {
    restricted_uppercase_file(int padding, bool half_open = false)
        {
            BOOST_IOS::openmode mode = 
                BOOST_IOS::out | BOOST_IOS::binary;
            ::std::ofstream f(name().c_str(), mode);
            write_padding(f, padding);
            const char* buf = narrow_data();
            for (int z = 0; z < data_reps; ++z)
                for (int w = 0; w < data_length(); ++w)
                    f.put((char) std::toupper(buf[w]));
            if (!half_open)
                write_padding(f, padding);
        }
};

struct restricted_lowercase_file : public temp_file {
    restricted_lowercase_file(int padding, bool half_open = false)
        {
            BOOST_IOS::openmode mode = 
                BOOST_IOS::out | BOOST_IOS::binary;
            ::std::ofstream f(name().c_str(), mode);
            write_padding(f, padding);
            const char* buf = narrow_data();
            for (int z = 0; z < data_reps; ++z)
                for (int w = 0; w < data_length(); ++w)
                    f.put((char) std::tolower(buf[w]));
            if (!half_open)
                write_padding(f, padding);
        }
};

// Can't have a restricted view of a non-seekble output filter.
struct tolower_seekable_filter : public seekable_filter {
    typedef char char_type;
    struct category 
        : output_seekable,
          filter_tag
        { };
    template<typename Sink>
    bool put(Sink& s, char c)
    { return boost::iostreams::put(s, (char) std::tolower(c)); }

    template<typename Sink>
    std::streampos seek(Sink& s, stream_offset off, BOOST_IOS::seekdir way)
    { return boost::iostreams::seek(s, off, way); }
};

void read_device()
{
    {
        restricted_test_file   src1(small_padding);
        test_file              src2;
        stream_offset          off = small_padding,
                               len = data_reps * data_length();
        filtering_istream first( restrict( file_source(src1.name(), in_mode), 
                                           off, len ) );
        ifstream               second(src2.name().c_str(), in_mode);
        BOOST_CHECK_MESSAGE(
            compare_streams_in_chunks(first, second),
            "failed reading from restriction<Device> with small padding"
        );
    }

    {
        restricted_test_file   src1(large_padding);
        test_file              src2;
        stream_offset          off = large_padding,
                               len = data_reps * data_length();
        filtering_istream first( restrict( file_source(src1.name(), in_mode), 
                                           off, len ) );
        ifstream               second(src2.name().c_str(), in_mode);
        BOOST_CHECK_MESSAGE(
            compare_streams_in_chunks(first, second),
            "failed reading from restriction<Device> with large padding"
        );
    }

    {
        restricted_test_file   src1(small_padding, true);
        test_file              src2;
        stream_offset          off = small_padding;
        filtering_istream first(restrict(file_source(src1.name(), in_mode), off));
        ifstream               second(src2.name().c_str(), in_mode);
        BOOST_CHECK_MESSAGE(
            compare_streams_in_chunks(first, second),
            "failed reading from half-open restriction<Device> "
            "with small padding"
        );
    }

    {
        restricted_test_file   src1(large_padding, true);
        test_file              src2;
        stream_offset          off = large_padding;
        filtering_istream first(restrict(file_source(src1.name(), in_mode), off));
        ifstream               second(src2.name().c_str(), in_mode);
        BOOST_CHECK_MESSAGE(
            compare_streams_in_chunks(first, second),
            "failed reading from half-open restriction<Device> "
            "with large padding"
        );
    }
}

void read_direct_device()
{
    {
        test_sequence<char>       first;
        restricted_test_sequence  src(small_padding);
        array_source              array_src(&src[0], &src[0] + src.size());
        stream_offset             off = small_padding,
                                  len = data_reps * data_length();
        filtering_istream         second(restrict(array_src, off, len));
        BOOST_CHECK_MESSAGE(
            compare_container_and_stream(first, second),
            "failed reading from restriction<Direct>"
        );
    }

    {
        test_sequence<char>       first;
        restricted_test_sequence  src(small_padding, true);
        array_source              array_src(&src[0], &src[0] + src.size());
        stream_offset             off = small_padding;
        filtering_istream         second(restrict(array_src, off));
        BOOST_CHECK_MESSAGE(
            compare_container_and_stream(first, second),
            "failed reading from half-open restriction<Direct>"
        );
    }
}

void read_filter()
{
    {
        restricted_test_file   src1(small_padding);
        uppercase_file         src2;
        stream_offset          off = small_padding,
                               len = data_reps * data_length();
        filtering_istream      first;
        first.push(restrict(toupper_filter(), off, len));
        first.push(file_source(src1.name(), in_mode));
        ifstream           second(src2.name().c_str(), in_mode);
        BOOST_CHECK_MESSAGE(
            compare_streams_in_chunks(first, second),
            "failed reading from restriction<Filter> with small padding"
        );
    }

    {
        restricted_test_file   src1(large_padding);
        uppercase_file         src2;
        stream_offset          off = large_padding,
                               len = data_reps * data_length();
        filtering_istream      first;
        first.push(restrict(toupper_filter(), off, len));
        first.push(file_source(src1.name(), in_mode));
        ifstream           second(src2.name().c_str(), in_mode);
        BOOST_CHECK_MESSAGE(
            compare_streams_in_chunks(first, second),
            "failed reading from restriction<Filter> with large padding"
        );
    }

    {
        restricted_test_file   src1(small_padding, true);
        uppercase_file         src2;
        stream_offset          off = small_padding;
        filtering_istream      first;
        first.push(restrict(toupper_filter(), off));
        first.push(file_source(src1.name(), in_mode));
        ifstream           second(src2.name().c_str(), in_mode);
        BOOST_CHECK_MESSAGE(
            compare_streams_in_chunks(first, second),
            "failed reading from half-open restriction<Filter> "
            "with small padding"
        );
    }

    {
        restricted_test_file   src1(large_padding, true);
        uppercase_file         src2;
        stream_offset          off = large_padding;
        filtering_istream      first;
        first.push(restrict(toupper_filter(), off));
        first.push(file_source(src1.name(), in_mode));
        ifstream           second(src2.name().c_str(), in_mode);
        BOOST_CHECK_MESSAGE(
            compare_streams_in_chunks(first, second),
            "failed reading from half-open restriction<Filter> "
            "with large padding"
        );
    }
}

void write_device() 
{
    {