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vdcomp(1)              DragonFly General Commands Manual             vdcomp(1)

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 portability 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 Viking
       compressed images.  Changed obuf to 'unsigned' to simplify computation
       of checksum.

       AUG89 Added code to get command line arguments for filenames and output
       format; routines to free memory used by the Huffman 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.

                                                                     vdcomp(1)

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