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Conference bulova::decw_jan-89_to_nov-90

Title:DECWINDOWS 26-JAN-89 to 29-NOV-90
Notice:See 1639.0 for VMS V5.3 kit; 2043.0 for 5.4 IFT kit
Moderator:STAR::VATNE
Created:Mon Oct 30 1989
Last Modified:Mon Dec 31 1990
Last Successful Update:Fri Jun 06 1997
Number of topics:3726
Total number of notes:19516

3584.0. "Condensing files" by COGITO::ZIKA (z) Mon Nov 05 1990 15:13

    Is there a way to compact ".SIXEL", ".SIX",
    ".UIS",
    ".UID",
    ".OLB",
    "RDB" and
    "SNP" files?
    		-- Chris
    
T.RTitleUserPersonal
Name
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3584.1DECdecision file squishPRAVDA::JACKSONYou run your mouth, I'll run my business brotherMon Nov 05 1990 22:3413
    Someone ( can't remember who) suggested the following to squish 
    a RDB/SNP file (this is from REGAL::DECDECISION)
    
      $       mcr rdo
            EXPORT 'decision$access_db.rdb' INTO 'decision$access_db.rbr
            with extensions
            
            IMPORT 'decision$access_db.rbr' INTO 'decisioN$access_db.rdb'
            Dictionary is not used
            End Import.
    
    
    -BILL
3584.2If only I had a DW terminal I'd know this?COGITO::ZIKAzTue Nov 06 1990 07:298
    Yes! This should work. This was also mentioned In an unrelated note in
    RDB. Now to look at the DECdecision docs...
    
    I will try the above but don't really expect to gain much. Since the
    files are several months old not much data may have changed. 
    
    If this process does work I may start running it monthly or when disk
    space gets low. -- Chris
3584.3STAR::KLEINSORGEFred Kleinsorge, VMS DevelopmentWed Nov 07 1990 08:3911
    
    SIXELs are typically already run length encoded, I don't know of a
    tool to run length encode an existing file.
    
    UIS files are structured binary files, and connot usually be
    compressed,  nor is there any compression tool.
    
    OLB (and MLB) files can be compressed.  See the documentation on the LIB
    utility for how to compress it.
    
    
3584.4LZ Compression may fit the bill3D::VESPERIs skiing more enjoyable?Thu Nov 08 1990 09:0512
>    Is there a way to compact ".SIXEL", ".SIX",

Do you need to be able to use the files in the compacted form?

If you are willing to use a decompress program before using
the data in the file, check out the LZ compression/decompression
utility in METOO::SW_TOOLS_CATALOG notes file. You can compress
any type of file with generally good results. Files which already
have some form of compression (run length encoding in SIXEL files,
for example) will not compress very much, if at all.

Andy V