MemoryBufferFile_test.cc

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#include "catch.hpp"
#include "MemoryBufferFile.hh"
#include "File.hh"
#include "ranges.hh"
#include "xrange.hh"
#include <array>
 
using namespace openmsx;
 
TEST_CASE("MemoryBufferFile")
{
        std::array<uint8_t, 10> buffer = {
                1, 2, 3, 4, 5, 6, 7, 8, 9, 10
        };
        std::array<uint8_t, 100> tmp;
 
        // create memory-backed-file
        File file = memory_buffer_file(buffer);
        CHECK(file.getPos() == 0);
        CHECK(file.isReadOnly());
        CHECK(file.getSize() == 10);
 
        // seek and read small part
        file.seek(2);
        CHECK(file.getPos() == 2);
        file.read(subspan(tmp, 0, 3));
        CHECK(file.getPos() == 5);
        CHECK(tmp[0] == 3);
        CHECK(tmp[1] == 4);
        CHECK(tmp[2] == 5);
 
        // seek beyond end of file is ok, but reading there is not
        file.seek(100);
        CHECK(file.getPos() == 100);
        CHECK_THROWS(file.read(subspan(tmp, 0, 2)));
 
        // try to read more than file size
        file.seek(0);
        CHECK(file.getPos() == 0);
        CHECK_THROWS(file.read(subspan(tmp, 0, 100)));
        CHECK(file.getPos() == 0);
 
        // read full file
        file.seek(0);
        file.read(std::span{tmp.data(), file.getSize()});
        for (auto i : xrange(10)) {
                CHECK(tmp[i] == (i + 1));
        }
        CHECK(file.getPos() == file.getSize());
 
        // writing is not supported
        CHECK_THROWS(file.write(std::span{tmp.data(), file.getSize()}));
}