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  porta-
       bility 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  std-
       out   for  output  filename;  disabled  various  messages;
       directed messages to stderr; added exit status

       DEC89 Modified program to handle both Voyager  and  Viking
       images.
       JUL88 C driver to decompress standard  Voyager  Compressed
       images by Mike Martin 1989/12/02.

MachTen                                                         2