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VistaIOBundle(3)


NAME

   VistaIOBundle - representation for Vista object with binary data

DESCRIPTION

   Introduction
   Since Vista allows you to invent your own types of objects and to store
   those objects in data files, it must  provide  some  way  for  standard
   programs  to  gracefully  handle objects that are unfamiliar to them. A
   program  must at least be able to  copy  your  custom  objects  intact,
   binary  data  and  all,  from  input  to output. Unfamiliar objects are
   represented internally by the Vista  library  using  the  VistaIOBundle
   data structure, which is described here.

   The VistaIOBundle Representation
   typedef struct {
          VistaIOAttrList list;    /* object's attribute list value */
          size_t length;           /* length of binary data */
          VistaIOPointer data;     /* pointer to binary data */
          char type_name[1];       /* beginning of object's type's name */
   } VistaIOBundleRec, *VistaIOBundle;

   An  arbitrary  object,  possessing  a type name, an attribute list, and
   possibly some binary data, can be completely represented in memory by a
   VistaIOBundle,  which  is a pointer to a variable-length structure. The
   structure has four fields. In type_name is the  name  of  the  object's
   type  as a null-terminated string. In list is a handle to its attribute
   list. If the object includes binary data, length is the  data's  length
   in  bytes  and  data  points  to storage obtained from VistaIOMalloc(3)
   containing the data. If, on the  other  hand,  the  object  include  no
   binary data, length is zero.

   Any  attribute  list  member can have a VistaIOBundle as its value. The
   attribute's value representation  is  denoted  by  the  VistaIORepnKind
   constant  VistaIOBundleRepn.  Such  attributes  can be created, copied,
   deleted, and accessed much like any other.

   VistaIOReadFile(3) reads a data file and returns  its  contents  as  an
   attribute  list  while  recording  objects  with  unfamiliar  types  as
   VistaIOBundle attributes. VistaIOWriteFile(3) writes a data  file  from
   the  contents  of  an  attribute  list while interpreting VistaIOBundle
   attributes. When the two are used together, an object with any type and
   any  binary  data  will  be passed unchanged from input to output while
   being stored in memory as a VistaIOBundle.

   Routines
   The following routines create and destroy a VistaIOBundle:

   VistaIOBundle VistaIOCreateBundle (VistaIOStringConst type_name,
             VistaIOAttrList list, size_t length, VistaIOPointer data)

        VistaIOCreateBundle  allocates a VistaIOBundleRec structure of the
        appropriate size and fills in its fields. In particular, the  list
        and  data  arguments are simply stored in the new VistaIOBundleRec
        (i.e., the structures they point to are not copied).

   void VistaIODestroyBundle (VistaIOBundle bundle)

          VistaIODestroyBundle  releases  all  storage   occupied   by   a
          VistaIOBundle,  including its attribute list and any binary data
          block.

SEE ALSO

   VistaIOattribute(3), VistaIOtype(3),

AUTHOR

   Art Pope <pope@cs.ubc.ca>

   Adaption to vistaio: Gert Wollny <gw.fossdev@gmail.com>



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