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vdcomp(1) 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 la- bels, image histogram, engineering table, line header table and an im- age 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 com- mand-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 Macin- tosh IIx using Lightspeed C version 3.0. When converting to other sys- tems, 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 com- pressed 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. XV GITHUB REPOSITORY The source code for this release of the XV software can be found on GitHub at <https://github.com/jasper-software/xv>. vdcomp(1)
Name | Synopsis | Description | Options | Limitations | Credits | History | XV GITHUB REPOSITORY
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