Technical Solutions for COBOL



Redvers Compression Algorithm - Frequently Asked Questions

Why have you written this product in COBOL?

We've taken the unusual step of writing and delivering this software in the form of COBOL source code subroutines because we understand how important it is to have a product that is easily integrated with existing applications.

Another advantage is that customers already running COBOL applications will already be familiar with the terminology, characteristics and capabilities of COBOL based programs.

How do I install this software?

The Redvers Compression Algorithm programs are sold in COBOL source code form and are installed by copying to your site source code library and running your standard COBOL compiler. Compilation at client sites enables installation on multiple platforms and ensures complete compatibility with all other COBOL applications on the platform.

In order to protect both clients and ourselves from unauthorized code changes, the source code has been "cloaked" using the Redvers Cloaking Device. This process makes no logical difference to the code but renders it unintelligible to humans.

What are the technical limitations?

As the product is written in COBOL and compiled using the standard site compiler, the limitations are the same as those placed on all other applications at the site.

Can I use another product to decompress data compressed by the Redvers Compression Algorithm?

No. The Redvers Compression Algorithm uses a unique algorithm to compress and decompress data and therefore other products will not be able to interpret the necessary bit patterns.

Is this software compatible with ASCII as well as EBCDIC based character sets?

Yes, all our products run on ASCII and EBCDIC platforms. No code changes are necessary.

Is this software compatible with sites using "little-endian" binary storage?

Yes, all our products run on "big-endian" and "little-endian" platforms. No code changes are necessary.

Can I use this product to encrypt data?

No. Data compressed using the Redvers Compression Algorithm, may look similar to an encrypted data file but it is not secure from someone trying to access your data. Please use our Redvers Encryption Module to safely encrypt/decrypt your data.

What are the benchmark statistics?

Actual compression rates range from 35% to 75%, depending on the length of the input data string and the length of the "sliding window".

Compression time is 0.3 megabytes per CPU second (using a "sliding window" of 400 bytes) and decompression is more than 14 megabytes per CPU second. All benchmark timings were performed on an IBM zSeries mainframe running z/OS 1.10.

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