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File Compression and Reorganization Utilities

CPRESS is a file compression / expansion utility for any ENSCRIBE file. ALL ENSCRIBE file attributes are retained in the compressed files, including: file ownership, security, modification times, key parameters, and alternate key parameters. This utility is particularly useful for compressing infreqently used files or files to be archived, in order to conserve space on the recording medium (e.g., tape, disc). It is also useful for distributing large files across a network to reduce transmission times. Compression ratios as 10:1 (90%) can be achieved using CPRESS.

EPRESS is a compression utility for EDIT files. The compressed file remains compatible with the EDIT format. EPRESS removes unallocated and deallocatable extents as well as dead space from EDIT files. Extents are reassigned so that most EDIT files fit into a single, full extent with one or no unallocated pages. EPRESS retains file ownership, security, and (optionally) modification date. It may be used to compress an EDIT file without changing the "last modified" timestamp.

XPRESS is an extent reorganization tool. Highly fragmented files can be reorganized with more efficient extent allocation. Files with large numbers of unallocated pages in primary extents can be reorganized with smaller extent sizes. XPRESS retains all ENSCRIBE file attributes.






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