DATA COMPRESSION METHOD AND DATA EXPANSION METHOD, COMPUTER PROGRAM PRODUCT AND ELECTRONIC SYSTEM TO EXECUTE THE METHODS

摘要

PROBLEM TO BE SOLVED: To improve a data compression method or a data expansion method adopting an LZSS type method and to provide a computer product and an electronic device which are accordingly enhanced. SOLUTION: The method employs a 1st control code for a literal sequence with a first maximum length and a second code for a pointer for backward referencing to a literal sequence to be compressed. The backward reference has a second maximum length and a literal sequence to be copied has a third maximum length.