cell_t sdReadFile( void *ptr, cell_t Size, int32_t nItems, FileStream * Stream );
cell_t sdWriteFile( void *ptr, cell_t Size, int32_t nItems, FileStream * Stream );
cell_t sdSeekFile( FileStream * Stream, off_t Position, int32_t Mode );
cell_t sdReadFile( void *ptr, cell_t Size, int32_t nItems, FileStream * Stream );
cell_t sdWriteFile( void *ptr, cell_t Size, int32_t nItems, FileStream * Stream );
cell_t sdSeekFile( FileStream * Stream, off_t Position, int32_t Mode );