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On compressing and indexing repetitive sequences. (English) Zbl 1292.68061
Summary: We introduce LZ-End, a new member of the Lempel-Ziv family of text compressors, which achieves compression ratios close to those of LZ77 but is much faster at extracting arbitrary text substrings. We then build the first self-index based on LZ77 (or LZ-End) compression, which in addition to text extraction offers fast indexed searches on the compressed text. This self-index is particularly effective for representing highly repetitive sequence collections, which arise for example when storing versioned documents, software repositories, periodic publications, and biological sequence databases.

##### MSC:
 68P30 Coding and information theory (compaction, compression, models of communication, encoding schemes, etc.) (aspects in computer science) 68W32 Algorithms on strings
PATRICIA
Full Text:
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