if (block_start & 0xFF) {
printf("moving stuff forward by %d bytes\n", block_start & 0xFF);
memset(temp_buf, 0xFF, block_start & 0xFF);
if (block_start & 0xFF) {
printf("moving stuff forward by %d bytes\n", block_start & 0xFF);
memset(temp_buf, 0xFF, block_start & 0xFF);