jas_matrix_t *jas_seq2d_create(int xstart, int ystart, int xend, int yend)
{
	jas_matrix_t *matrix;
	assert(xstart <= xend && ystart <= yend);
	if (!(matrix = jas_matrix_create(yend - ystart, xend - xstart))) {
		return 0;
	}
	matrix->xstart_ = xstart;
	matrix->ystart_ = ystart;
	matrix->xend_ = xend;
	matrix->yend_ = yend;
	return matrix;
}
The product receives input or data, but it does
        not validate or incorrectly validates that the input has the
        properties that are required to process the data safely and
        correctly.