DIFFERENCE DATA GENERATOR, METHOD AND PROGRAM FOR GENERATING DIFFERENCE DATA OF DIFFERENCE DATA GENERATOR

摘要

PROBLEM TO BE SOLVED: To reduce size of difference data when data such as a program are updated (version up).;SOLUTION: In this difference data generator 100, a difference data first generation part 120 reads old data 192 and new data 191 stored in a data storage part 190 to generate difference data 193 before conversion using the conventional Move instruction code and Add instruction code. A difference data second generation part 130 generates a special Move instruction code which does not update a value of a processing pointer of the new data after Move processing and difference data 194 after conversion using a Skip instruction code which updates only a value of the processing pointer of the new data based on the difference data 193 before conversion. A difference data output part 140 compares data size between the difference data 193 before conversion and the difference data 194 after conversion to output the data with smaller data size as the difference data.;COPYRIGHT: (C)2008,JPO&INPIT