NDBOOT_BSIZE
((((ssize_t) (obj_block_count) - (ssize_t) ((block_number) - (obj_block_first))) * NDBOOT_BSIZE) - (ssize_t) (byte_offset))
boot1_block_count = (boot1_byte_count + (NDBOOT_BSIZE - 1)) / NDBOOT_BSIZE;
boot2_block_count = (boot2_byte_count + (NDBOOT_BSIZE - 1)) / NDBOOT_BSIZE;
block_number += (byte_offset / NDBOOT_BSIZE);
byte_offset = byte_offset % NDBOOT_BSIZE;
file_offset = ((block_number - NDBOOTD_BOOT1_BLOCK_FIRST) * NDBOOT_BSIZE) + byte_offset;
file_offset = ((block_number - NDBOOTD_BOOT2_BLOCK_FIRST) * NDBOOT_BSIZE) + byte_offset;