METHOD, PROGRAM, AND DEVICE FOR UPDATING DIFFERENTIAL GENERATED FROM OLD/NEW FILES

摘要

PURPOSE: A method, a program, and a device for updating differential generated from old/new files are provided to restart an updating process halfway after power recovery by recovering the new data from the transmitted divided differential data and, if power is cut off during the updating process for overwriting the new data to the rewrite target data. CONSTITUTION: A differential data receiver(32) divides the new file(16) into multiple sections of the same size, receives entire section data by searching a data string agreed with the data string in each section from one section before a start position of the target section in an old file(14) to the last of the old file, and stores the data in a non-volatile memory(34). A recovery processor(36) recovers the section data from the differential data of the first section and stores the data to the non-volatile memory. An overwrite processor(38) reads the recovery data from the non-volatile memory and overwrites the recovery data to the rewrite target data of the non-volatile memory.