Storage of a compressed file containing its own compression mana

Details Storage of a compressed file containing its own compression mana Storage of a compressed file containing its own compression mana

1996-05-10

1998-09-22

Amsbury, Wayne

Data processing: database and file management or data structures

Database design

Data structure types

707205, G06F 1200

Patent

active

058130110

ABSTRACT:
A compressed file consists of: a header that carries information showing the position of a compression management table; compressed codes; and the compression management table that holds information showing the storage location of the compressed code of each original record. In a preferred mode, compression and decompression of data and access to compressed data are performed using input/output functions within an input/output function library so that the user need not be aware of the compression and decompression operations and the storage location of compressed data. In a further preferred mode, with these input/output functions it is judged whether a file being accessed is a compressed file or not, and if it is a compressed file, the operation is switched to input/output functions for a compressed file.

REFERENCES:
patent: 5087913 (1992-02-01), Eastman
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patent: 5193184 (1993-03-01), Belsan et al.
patent: 5237460 (1993-08-01), Miller et al.
patent: 5237675 (1993-08-01), Hannon, Jr.
patent: 5463772 (1995-10-01), Thompson et al.
patent: 5481701 (1996-01-01), Chanbers, IV
patent: 5488365 (1996-01-01), Seroussi et al.
"A Universal Compressed Data Format for Foreign File Systems", Kawashima et al, IEEE Data Compression Conference, 1995, p. 429.

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