dlib C++ Library - rand.cpp

    // Copyright (C) 2006  Davis E. King (davisking@users.sourceforge.net)
    // License: Boost Software License   See LICENSE.txt for the full license.

    #include <sstream>
    #include <string>
    #include <cstdlib>
    #include <ctime>
    #include <cmath>
    #include <dlib/rand.h>
    #include <dlib/compress_stream.h>

    #include "tester.h"

    namespace
    {

        using namespace test;
        using namespace dlib;
        using namespace std;

        logger dlog("test.rand");

        void check_bpp (
            const std::string str
        )
        {
            istringstream rdata;
            ostringstream sout;
            rdata.str(str);
            double compressed_size;
            compress_stream::kernel_1a cs1;
            compress_stream::kernel_2a cs2;

            compress_stream_kernel_1<
                entropy_encoder_model_kernel_5<257,entropy_encoder::kernel_1a,4000000,4>,
                entropy_decoder_model_kernel_5<257,entropy_decoder::kernel_1a,4000000,4>,
                crc32::kernel_1a
                > cs3;

            print_spinner();

            rdata.clear();
            rdata.seekg(0);
            sout.clear();
            sout.str("");
            cs1.compress(rdata,sout);
            compressed_size = sout.str().size();
            compressed_size *= 8;
            compressed_size /= str.size();
            DLIB_CASSERT(compressed_size >= 8, "order 0 bps: " << compressed_size);
            dlog << LINFO << "order 0: " << compressed_size;

            print_spinner();

            rdata.clear();
            rdata.seekg(0);
            sout.clear();
            sout.str("");
            cs2.compress(rdata,sout);
            compressed_size = sout.str().size();
            compressed_size *= 8;
            compressed_size /= str.size();
            DLIB_CASSERT(compressed_size >= 8, "order 1 bps: " << compressed_size);
            dlog << LINFO << "order 1: " << compressed_size;

            print_spinner();

            rdata.clear();
            rdata.seekg(0);
            sout.clear();
            sout.str("");
            cs3.compress(rdata,sout);
            compressed_size = sout.str().size();
            compressed_size *= 8;
            compressed_size /= str.size();
            DLIB_CASSERT(compressed_size >= 8, "order 4 bps: " << compressed_size);
            dlog << LINFO << "order 4: " << compressed_size;

        }

        template <
            typename rand
            >
        void rand_test (
        )
        /*!
            requires
                - rand is an implementation of rand/rand_kernel_abstract.h
                  is instantiated with int
            ensures
                - runs tests on rand for compliance with the specs
        !*/
        {

            ostringstream seed;
            seed << (unsigned int)time(0);

            ostringstream sout;

            rand r, r2;
            DLIB_CASSERT(r.get_seed() == "","");
            r.set_seed(seed.str());

            DLIB_CASSERT(r.get_seed() == seed.str(),"");
            r.clear();
            DLIB_CASSERT(r.get_seed() == "","");
            swap(r,r2);
            DLIB_CASSERT(r.get_seed() == "","");
            r.set_seed(seed.str());
            DLIB_CASSERT(r.get_seed() == seed.str(),"");
            swap(r,r2);
            DLIB_CASSERT(r2.get_seed() == seed.str(),"");
            DLIB_CASSERT(r.get_seed() == "","");
            swap(r,r2);
            DLIB_CASSERT(r.get_seed() == seed.str(),"");
            DLIB_CASSERT(r2.get_seed() == "","");

            print_spinner();
            unsigned long size = 100000;
            for (unsigned long i = 0; i < size; ++i)
            {
                uint32 ch = r.get_random_32bit_number();
                sout.write((char*)&ch,4);
            }

            check_bpp(sout.str());
            sout.clear();
            sout.str("");

            print_spinner();
            for (unsigned long i = 0; i < size; ++i)
            {
                uint16 ch = r.get_random_16bit_number();
                sout.write((char*)&ch,2);
            }

            check_bpp(sout.str());
            sout.clear();
            sout.str("");

            print_spinner();
            for (unsigned long i = 0; i < size; ++i)
            {
                unsigned char ch = r.get_random_8bit_number();
                sout.write((char*)&ch,1);
            }

            check_bpp(sout.str());
            sout.clear();
            sout.str("");

        }

        class rand_tester : public tester
        {
        public:
            rand_tester (
            ) :
                tester ("test_rand",
                        "Runs tests on the rand component.")
            {}

            void perform_test (
            )
            {
                dlog << LINFO << "testing kernel_1a";
                rand_test<dlib::rand::kernel_1a>();
            }
        } a;

    }