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@kyuucr kyuucr/mes-decrypt.py
Last active Nov 16, 2015

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MES file text extractor from Dead of the Brain (PC-9801, 1992)
#!/usr/bin/python
import re
filename = './MES/OPEN_1.MES'
with open(filename, 'rb') as f:
content = f.read()
# get lines from bytes start marker 0xBA 0x23-25 to end marker 0xBA 0x26
# 0x23 == cole, 0x24 == doc, 0x25 == jack(?)
results = re.findall(br'(\xBA[\x23-\x25].*?)\xBA\x26', content)
if results:
for r in results:
# print repr(r)
# r = results[0]
sym = False
control = False
skip = False
sub = ''
for c in r:
if c == '\xBA' and not skip: # control byte
control = True
elif control and c == '\x23': # dialog start cole
sub += '\x83\x52\x81\x5B\x83\x8B\x81\x46'
control = False
elif control and c == '\x24': # dialog start doc
sub += '\x83\x4E\x81\x5B\x83\x4B\x81\x5B\x81\x46'
control = False
elif control and c == '\x25': # dialog start jack?
sub += '\x81\x46'
control = False
elif control and c == '\x26': # dialog end
control = False
elif control and c == '\x28': # symbol byte
sym = True
control = False
elif sym and c == '\x0D': # comma
sub += '\x81\x41'
sym = False
elif sym and c == '\x0E': # ..
sub += '\x81\x64'
sym = False
elif sym and c == '\x0F': # period
sub += '\x81\x42'
sym = False
elif sym and c == '\x10': # space
sub += '\x81\x40'
sym = False
elif sym and c == '\x11': # !
sub += '\x81\x49'
sym = False
elif sym and c == '\x12': # ?
sub += '\x81\x48'
sym = False
elif sym and c == '\x13': # newline for two characted dialog in one box
sub += '\n'
sym = False
elif skip:
sub += c
skip = False
elif re.match('[\x81-\x83,\x88-\x9F,\xE0-\xEA]', c): # kana, kanji and some symbols - skip next byte
sub += c
skip = True
elif sym or control:
print "ERROR sym/control byte skipped"
sym = False
control = False
else:
# hiragana char, prefix 0x82 and shift by 0x74
sub += '\x82' + chr(ord(c)+114)
sub += '\n'
print (sub.decode('shift-jis')).encode('utf-8', 'ignore')
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