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Name
     vdcomp - decompress a compressed PDS image

Synopsis
     vdcomp [ infile ] [ outfile ] [ format-code ]

Description
     The vdcomp program reads a variable  length  compressed  PDS
     image  and outputs a fixed length uncompressed image file in
     PDS format with labels, image histogram, engineering  table,
     line  header  table and an image with PDS, FITS, VICAR or no
     labels.

     If used on a non-byte-swapped machine the image histogram is
     un-swapped.

Options
     Vdcomp will prompt for any options that are not supplied  on
     the command-line.

     infile
          The name of compressed image file.

     outfile
          The name of uncompressed image file.

     format-code
          Select from the following list:
               1 - SFDU/PDS format [default]
               2 - FITS format
               3 - VICAR format
               4 - unlabelled binary array

Limitations
     This program has been tested on a VAX  780  (VMS  4.6),  SUN
     Workstation  (UNIX  4.2,  release 3.4), an IBM PC (MICROSOFT
     5.1 compiler) and Macintosh IIx using Lightspeed  C  version
     3.0.   When converting to other systems, check for portabil-
     ity conflicts.

Credits
     This program uses Kris Becker's subroutine  DECOMP.C  (which
     is included in this program in a shortened version).

History
     bradley@cis.upenn.edu 06-23-94 ansi-fied program

     datri@convex.com, 11-15-91 added recognition of - as  stdout
     for  output  filename;  disabled  various messages; directed
     messages to stderr; added exit status


     DEC89 Modified program to handle  both  Voyager  and  Viking
     images.

     OCT89 Converted Voyager decompression program to handle Vik-
     ing  compressed  images.  Changed obuf to 'unsigned' to sim-
     plify computation of checksum.

     AUG89 Added code to get command line arguments for filenames
     and output format; routines to free memory used by the Huff-
     man tree); fixed the SFDU label output length; and  modified
     the  I/O  routines  so  that  the  open for Host type 2 uses
     binary I/O.

     JUN89 Fixed READVAR,  to  get  length  on  16-bit  unswapped
     hosts.

     JUL88 C driver to  decompress  standard  Voyager  Compressed
     images by Mike Martin 1989/12/02.

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