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  CLASS: MacResourceForkEA     --DVM
  PUBLIC METHODS:
    offsetToData()  - Returns the offset in bytes from the beginning of 
                    the EA to the beginning of the Resource Fork
                    Data.
    error()         - Returns any state errors. Should be called after
                     construction and after any fromISO() or toISO() .
    dataLen()       - Sets or gets the length of the Resource Fork
                    Data. If it causes the attrLen to be too small,
                    it is set to the minAttrLen for the new
                     dataLen. If dataLen() is reduced, the attrLen() 
                    is left unchanged.
    attrType()      - Returns the value of the attrType field.
    attrSubtype()   - Returns the value of the attrSubtype field.
    attrID()        - Returns the String identifying the Attr.
    minAttrLen()    - Returns the minimum size the EA may be set to.
    attrLen()       - Gets or sets the EA to the supplied length. If
                    the new value is too short or disallowed for some
                    reason, it returns an error indicating that.
    clear()         - Sets the state to the exact same as right after 
                    construction. All fields are initialized to
                    defaults and/or zeroes. Note that the size of the
                    resourceFork is not changed, but the attrLen is
                    set to the minAttrLen.
    toISO()         - Translates the structure to its ISO
                    representation at the supplied byte pointer.
    fromISO()       - Translates the structure from its ISO
                    representation at the supplied byte pointer.
 
  USAGE NOTES:
   attrLen() methods are used to grow or shrink this EA as well as the
   Resource Fork data itself. !!! Is padding possible here? How? We
   HAVE to propagate up access to more than one length. --
   ImplUseLen() and EALen().?
  
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