FILL_BYTE
sum += (check_buf[i] != FILL_BYTE); \
FILL_BYTE); \
sum += (check_buf[i] == FILL_BYTE); \
FILL_BYTE & forced_mask, \
memset(fill_start, (forced_mask | 0x55) & FILL_BYTE, fill_size);
memset(fill_start, (forced_mask | 0xaa) & FILL_BYTE, fill_size);