offset_psar  (pbp_buf+0x24)   <-offset for np_header
LBA start    (np_header+0x54)
LBA end      (np_header+0x64)
block_size   (np_header+0x0c)
lba_size     (end-start+1)
total_blocks (lba_size+block_size-1)/block_size
offset_table (np_header+0x6c) <-offset for np_table

tp           (np_table+block*32)

everything in big endian, read it backwards

tp[4] is block offset relative to np_header
tp[5] is block size in bytes

block_locat  (offset_psar+tp[4]) <- location of block X where X is block number in tp