- PKWARE PKZIP IN AUTOEXEC FILE SOFTWARE
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If the token is used repeatedly in a file (long strings of the character 0, for instance), that information can be stored in fewer bytes than the original string.
The string's original form can be reduced to representative tokens. Then the line would look like: The raSpfalls mly ontpl.ĭata compression takes advantage of the way data is represented in the computer. What if you replaced each duplicate occurrence of one of these strings with a special code, called a token, that would stand for the duplicated numbers? Each token would contain a much shorter number combination that told you how many characters (including spaces) to count backwards in the string and how may characters were duplicated.
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The letters "ain" occurs four times, the two-character sequence "n" plus a space occurs twice, and the three-character sequence "he" plus a space occurs twice. The letters "in" and the space after the word "in" are repeated at the ends of the words "rain" and "Spain" in the sentence. But this simple line contains a surprising amount of repetition. Normally the above statement would take 44 or more bytes of disk space because of the amount of words in the document. And because the information was redundant, PKUNZIP can restore that material when it unzips your file.įor example, consider the line below: The rain in Spain falls mainly on the plain. With the redundant material removed, the file takes up less space. How does PKZIP work? PKZIP uses several methods of compressing data using seek out and eliminate redundant information within a file.
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Consult the file ADDENDUM.DOC for further information.īrown Deer, WI 53223 How PKZIP and most other compression software work You can default any of these options with the PKUNZIP environment variable. Restore volume label on destination drive.ĭisable 32-bit instruction usage on 80386 or higher CPU's.
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ZIP sort by. Restore/create directory structure stored in. zip extension can be pkunziped, and unzipped in WinZip or another compression utility.ĭo you have a listing of available switches used at the command line? PKUNZIP (R) FAST! Extract Utility Version 2.04g 02-01-93Ĭorp. Will I be able to unzip a program with WinZip I zipped in PKZIP?Īssuming the file was zipped correctly, any file with the. The -& is the important part of the above line and is telling pkzip to place your files onto multiple disks.
pkzip -&.Įxample: pkzip c:\windows\*.* a:\windows.zip -&. To do this, you would use the below syntax. How do I ZIP files that are larger than one diskette onto multiple diskettes?