vdcomp man page on BSDi

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vdcomp(1)						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  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.

								1

vdcomp(1)						vdcomp(1)

       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 file-
       names 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.

								2

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