Function ioWindowsFsMemoryMap

Common_3/OS/Windows/WindowsFileSystem.cpp:261–303

}

static bool ioWindowsFsMemoryMap(FileStream* fs, size_t* outSize, void const** outData)
{
    __FS_NO_ERR;
    *outSize = 0;
    *outData = NULL;

    if (fs->mMode & FM_WRITE)
    {
        // Cannot memory map on files with WRITE access
        __FS_SET_ERR(FS_NOT_PERMITTED_ERR);
        return false;
    }

    WSD(stream, fs);

    // mapped already
    if (!stream->mapView)
    {
        HANDLE fileMapping = CreateFileMappingW(stream->handle, NULL, PAGE_READONLY, 0, 0, NULL);
        if (!fileMapping)
        {
            __FS_SET_ERR(FS_INTERNAL_ERR);
            return false;
        }

        ASSERT(GetLastError() != ERROR_ALREADY_EXISTS);

        LPVOID mem = MapViewOfFile(fileMapping, FILE_MAP_READ, 0, 0, 0);
        if (!mem)
        {
            __FS_SET_ERR(FS_INTERNAL_ERR);
            CloseHandle(fileMapping);
            return false;
        }

        stream->fileMapping = fileMapping;
        stream->mapView = mem;
    }

    *outSize = ioWindowsFsGetSize(fs);
    *outData = stream->mapView;
    return true;
}

static bool ioWindowsFsClose(FileStream* fs)
{