Generating and searching compressed data

Details Generating and searching compressed data Generating and searching compressed data

2005-06-21

2005-06-21

Williams, Howard L. (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

Substituting specified bit combinations for other prescribed...

C341S087000, C725S039000, C725S053000, C707S793000

Reexamination Certificate

active

06909384

ABSTRACT:
Data destined for a client is compressed at a server in a manner that produces a compressed data string that can be searched in its compressed state. The server constructs a code table that assigns codes from a standard code set (e.g., ASCII code set) that are normally unused to selected character pairs in the data string (e.g., the most frequently occurring character pairs). During compression, the selected character pairs are replaced with the corresponding codes. Identifiers are inserted into the compressed data string to separate substrings. To search the compressed data string at the client, a search query is compressed and compared to the compressed substrings. The substring identifiers are used to quickly locate each successive compressed substring. When a match is found, the matching substring is decompressed by replacing the code in the compressed substring with the corresponding character pair in the code table.

REFERENCES:
patent: 5548338 (1996-08-01), Ellis et al.
patent: 5737733 (1998-04-01), Eller
patent: 5758259 (1998-05-01), Lawler
patent: 5844620 (1998-12-01), Coleman et al.
patent: 6032197 (2000-02-01), Birdwell et al.

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