Automatic file differencing and updating system

Details Automatic file differencing and updating system Automatic file differencing and updating system

1996-11-22

1998-11-03

Amsbury, Wayne

Data processing: database and file management or data structures

Database design

Data structure types

G06F 1730

Patent

active

058325204

ABSTRACT:
A method and file structure for generating an efficient difference files from and old file and a new file so that a difference file can be transmitted to a second computer system where the difference file and a duplicate of the old file can quickly be used to create a copy of the new file is disclosed. A differencing process compares an old file and a new file to generate a difference file in which the old file is used as a database of byte strings. The differencing process reads strings of data from the new file, searches for the existence of those strings in the old file, and notes the locations in the old file in which strings in the new file are found and stores in a difference file an indication of the location where a matching string is found and an indication of the length. A specific file structure for the difference file is disclosed.

REFERENCES:
patent: 5278979 (1994-01-01), Foster et al.
patent: 5418945 (1995-05-01), Carter et al.
patent: 5604853 (1997-02-01), Nagashima
patent: 5623656 (1997-04-01), Lyons
patent: 5644709 (1997-07-01), Austin
Cormen, et al., Introduction to Algorithms, The MIT Press (1990).
Pocket Soft, Inc., White Paper re .RTPatch Professional Binary Update System, from the World Wide Web (http://www.pocketsoft.com) (Nov. 14, 1996).
"Comparing and Merging Files", from the World Wide Web (Jun. 8, 1996).

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