NETATALK VERSION 1.6 DB format
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- from libatalk/cnid/cdb/README
the catalog database keeps track of three mappings:
    CNID     -> dev/ino and did/name
    dev/ino  -> CNID
    did/name -> CNID

- all data is BIG-ENDIAN!
- cnid.db structure
 KEY:
  4 bytes = CNID
 VALUE:
  4 bytes = device
  4 bytes = inode
  4 bytes = parent directory cnid a.k.a. did
  n bytes = filename (as on disk)
  1 byte  = \x00

- devino.db structure
 KEY:
  4 bytes = device
  4 bytes = inode
 VALUE:
  4 bytes = CNID

- didname.db structure
 KEY:
  4 bytes = parent directory cnid a.k.a. did
  n bytes = filename (as on disk)
  1 byte  = \x00
 VALUE:
  4 bytes = CNID of file