# Rune Factory 4 (Special)
# Script to fix save checksum after modification
#
# Works on save files and "system saves" / save select file
#
# Written by HenryEx
#
# script for QuickBMS http://quickbms.aluigi.org
# See also: http://aluigi.altervista.org/bms/quickbms_crc_engine.txt

get NAME filename
get FILESIZE asize
get MAGIC long
set PAD long 0xE0

if MAGIC == 1144276562  # string 'RF4D'
  get FILECRC long
  set PAD long 0
else
  set FILECRC long MAGIC
  set PAD long 0xE0
endif

SavePos OFFSET
xmath SIZE "FILESIZE - OFFSET - PAD"

# print "File CRC: %FILECRC|x%, data pos: %OFFSET%, pad by %PAD%, data size: %SIZE%"

encryption CRC 0xEDB88320 "32 -1 -1 0 0 1"
log MEMORY_FILE OFFSET SIZE
set NEWCRC long QUICKBMS_CRC

if FILECRC == NEWCRC
  print "Save CRC seems to be intact! No modification necessary."
  CleanExit
endif

encryption "" ""
log MEMORY_FILE 0 FILESIZE

math OFFSET - 4
goto OFFSET MEMORY_FILE
put NEWCRC long MEMORY_FILE
print "Checksum fixed! New CRC: %NEWCRC|x%"

log NAME 0 FILESIZE MEMORY_FILE
CleanExit