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Message: [QUOTE="Europia79, post: 120258, member: 120499"] Okay, I modified my approach and things quickly become readily apparent & crystal clear: [CODE=bash]#!/bin/bash # cmp 'parent_baserom' 'hack' | wc -l # smc_diff=1120; # sfc_diff=1742; ips_file="patch.ips"; sfc_file="Chrono Trigger (USA).sfc"; smc_file="Chrono Trigger (USA).smc"; eof="454F46"; declare -i index=5; declare -i count=0; declare -i sfc=0; declare -i smc=0; while true do offset=$(xxd -ps -s ${index} -l 3 "${ips_file}"); index+=3; size=$(xxd -ps -s ${index} -l 2 "${ips_file}"); index+=2; data=$(xxd -ps -s ${index} -l 0x${size} "${ips_file}"); index+=0x${size}; count+=0x${size}; if [ -z "$data" ]; then break; fi; sfc_string=""; sfc_data=$(xxd -ps -s 0x${offset} -l 0x${size} "${sfc_file}"); for (( n=0; n < (( 0x${size} * 2 )); n+=2 )) do if [[ "${sfc_data:$n:2}" == "${data:$n:2}" ]] then sfc+=1; sfc_string="${sfc_string}${sfc_data:$n:2}"; else sfc_string="${sfc_string}--"; fi done smc_string=""; smc_data=$(xxd -ps -s 0x${offset} -l 0x${size} "${smc_file}"); for (( n=0; n < (( 0x${size} * 2 )); n+=2 )) do if [[ "${smc_data:$n:2}" == "${data:$n:2}" ]] then smc+=1; smc_string="${smc_string}${smc_data:$n:2}"; else smc_string="${smc_string}--"; fi done echo "--------------------"; printf "index: '%x'\n" ${index}; printf "offset: '%x'\n" 0x${offset}; printf "size: '%x'\n" 0x${size}; echo "data: '${data}'"; echo " sfc: '${sfc_string}'"; echo " smc: '${smc_string}'"; echo "count: '${count}'"; done echo "--------------------"; echo "count: '${count}'"; echo "sfc: '${sfc}'"; echo "smc: '${smc}'"; exit 0; [/CODE] [/QUOTE]

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