The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 02, 2003
Filed:
Mar. 21, 2002
Francis A. Kampf, Jeffersonville, VT (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method and system for increasing compression efficiency of a lossless data compression utility. The data compression utility compresses a segmented input data stream into independently decompressible data blocks, and includes a history buffer that maintains a history of matching character sequences. In accordance with the method of the present invention, a data segment is compressed utilizing a history buffer to identify repeated character sequences within the data segment. Upon receipt of a next data segment to be compressed, the history buffer is updated to include a pre-selected data set and reset data from the next data segment. As part of the compression an adaptable cache is searched for non-repeating bytes within a next data segment. Matching bytes are coded as cache references. Further efficiency is obtained by processing the next data segment as two-byte pairs.