DATA COMPACTION METHOD FOR AN INTERMEDIATE OBJECT CODE PROGRAMME EXECUTABLE IN AN ONBOARD SYSTEM PROVIDED WITH DATA PROCESSING RESOURCES AND CORRESPONDING ONBOARD SYSTEM WITH MULTIPLE APPLICATIONS

摘要

The invention concerns a data compaction method and system for an intermediate programme. The method consists in: searching the programme (1000) for identical sequences (Si) and counting Ni number of occurrences of each sequence (Si); a comparison test (1001) to find the superiority of a function f(Ni) to a reference value enables to generate (1003) a specific instruction of a specific code (Ci) with which the sequence (Si) is associated; replacing (1004) each occurrence in the sequence (Si) by the specific code (Ci) in the intermediate programme to create a compacted intermediate programme (FCC) with which an executing file (FEX) is associated. The invention is applicable to multiple application portable objects such as microprocessor cards, onboard systems or the like.