Nayuta Eboot Dump v1

# Dump Nayuta eboot.
# Need decrypted eboot in file boot.orig; outputs to ebootdump.csv
# Many false positives.

import os

def get_data(filename):
    totalbytes = os.path.getsize(filename)
    infile = open(filename, 'rb')
    totalfiledata = infile.read(totalbytes)
    return totalfiledata

def is_jis_char(s):
    try:
        s.decode('cp932')
    except UnicodeDecodeError:
        return False
    if len(s.decode('cp932')) == 1:
        return True
    return False

def filterspecialcodes(text):
    textpos = 0
    newtext = ""
    specialflag = False

    while textpos < len(text):
        if ord(text[textpos]) > 31 and ord(text[textpos]) < 128:
            if specialflag == True:
                specialflag = False
                newtext += ' }'
            newtext += text[textpos]
            textpos += 1
        elif is_jis_char(text[textpos:textpos+2]) and textpos + 1 != len(text):
            if specialflag == True:
                specialflag = False
                newtext += ' }'
            newtext += text[textpos:textpos+2]
            textpos += 2
        else:
            if specialflag == False:
                specialflag = True
                newtext += '{'
            newtext += ' ' + text[textpos].encode('hex')
            textpos += 1

    if specialflag == True: newtext += ' }'

    return newtext

global filedata
filedata = get_data('boot.orig')

pos = 0x21d380
flag = False
output = ""
output2 = ""
while pos < 0x234680:
    if (ord(filedata[pos]) > 31 and ord(filedata[pos]) < 128) \
         or ord(filedata[pos]) == 0xA:
        if flag == False:
            addr = hex(pos)
            startpos = pos
        output2 += filedata[pos]
        pos += 1
        flag = True
    elif is_jis_char(filedata[pos:pos+2]):
        if flag == False:
            addr = hex(pos)
            startpos = pos
        output2 += filedata[pos:pos+2]
        pos += 2
        flag = True
    elif flag == True:
        flag = False
        if len(output2) > 1 and filedata[pos] == '\x00':
            pos2 = pos
            while filedata[pos2] == '\x00':
                pos2 += 1
            avail_space = pos2 - startpos - 1
            output += addr + '\t' + filterspecialcodes(output2) + \
                      '\t' + str(avail_space) + '\r\n'
        pos += 1
        output2 = ""
    else:
        pos += 1

outfile = open('ebootdump.csv','wb')
outfile.write(output)
outfile.close()