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E.1 NCSA HDF Vset
NCSA HDF Vset Calls Summary E.1
National Center for Supercomputing Applications
November 1990
November 1990
Appendix E Compatibility Information for 1.0 Users
Overview
This appendix explains how to convert HDF Vset 1.0 files so they
will be compatible with HDF Vset 2.0.
Source Files
Since the release of HDF Vset 1.0, the data structures associated
with Vsets (ie HDF representations of vgroups and vdatas) have
been revised to allow new features to be incorporated in future.
Thus files created by release 2.0 cannot be read by applications that
use the earlier 1.0 release of the HDF Vset library.
The conversion program, vcompat, should be used to convert an
existing HDF Vset file (that was created using release 1.0 ) so that
it is compatible with this and future releases. This program is
included in this release as a C-source file.
The conversion merely creates new data description elements in
the same file. As a result, that same file may still be used with
existing applications (that uses the release 1.0 Vset library) as
well as new applications (that uses the release 2.0 library). Note
that after the conversion, the original file will become slightly
bigger.
Existing applications may link to the release 2.0 Vset library with
no modifications needed.
vcompat may be created as follows:
cc vcompat.c -o vcompat libdf.a libvg.a
To convert an existing HDF Vset file, type:
vcompat <existing-file>
vcompat will not convert a HDF file that is already compatible
with release 2.0.