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Multiple pattern matching in LZW compressed text

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5 Author(s)
Kida, T. ; Dept. of Inf., Kyushu Univ., Fukuoka, Japan ; Takeda, M. ; Shinohara, A. ; Miyazaki, M.
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We address the problem of searching in LZW compressed text directly, and present a new algorithm for finding multiple patterns by simulating the move of the Aho-Corasick (1975) pattern matching machine. The new algorithm finds all occurrences of multiple patterns whereas the algorithm proposed by Amir, Benson, and Farach (see Journal of Computer and System Sciences, vol.52, p.299-307, 1996) finds only the first occurrence of a single pattern. The new algorithm runs in O(n+m2 +ra) time using O(n+m2) space, where n is the length of the compressed text, m is the length of the total length of the patterns, and r is the number of occurrences of the patterns. We implemented a simple version of the algorithm, and showed that it is approximately twice faster than a decompression followed by a search using the Aho-Corasick machine

Published in:

Data Compression Conference, 1998. DCC '98. Proceedings

Date of Conference:

30 Mar-1 Apr 1998