System and method for manipulating compressed files

Details System and method for manipulating compressed files System and method for manipulating compressed files

1996-09-16

1998-09-01

Black, Thomas G.

Data processing: database and file management or data structures

Database design

Data structure types

707100, 39518211, G06F 1730

Patent

active

058025200

ABSTRACT:
A user may use a client program to generate requests for the contents of an overall compressed file or to retrieve particular individual files within an overall compressed file at a server. The server program responds by retrieving a summary directory within a compressed file for transmission to the client program. The summary directory identifying the contents of the overall compressed file may be displayed at the client. In response to an individual file request, an individual file extractor of the server program extracts an individual file from an overall compressed file that corresponds to an individual file identified in the individual file request. Using the client program, a user may request the merger of two overall compressed files or the modification of individual files stored within an overall compressed file. To merge two overall compressed files, a merge file generator of the server program retrieves the summary directory for each overall compressed file and transfers the individual files of the first overall compressed file only if a corresponding directory entry does not exist in the summary directory for the second overall compressed file. The merge file generator transfers all of the individual files for the second overall compressed file to the merge file. Therefore, redundant individual files are eliminated from the merge file. For modifying individual files, a modifier file generator of the client program generates a modification file command to modify or delete individual files within an overall compressed file stored at the server.

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patent: 5548687 (1996-08-01), Motoyama
patent: 5555371 (1996-09-01), Duyanovich et al.

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