arc.py

from sys import argv, exit
from struct import unpack
from binascii import hexlify
from StringIO import StringIO
from os import getcwd
from zlib import decompress
from os import makedirs
from os.path import dirname

if len(argv) != 2:
    print '[*] Usage: python', argv[0], '<arc>'
    exit()

def read(fp, offset, size):
    fp.seek(offset)
    return fp.read(size)

def two(buf):
    return unpack('H', buf)[0]

def int_(buf):
    return unpack('I', buf)[0]

arc = argv[1]
fp = open(arc, 'rb')

magic = read(fp, 0, 4)
version = two(read(fp, 4, 2))
num = two(read(fp, 6, 2))

print '[*] Magic ID        :', magic
print '[*] Version         :', version
print '[*] Number of files :', num
print ''

class Jpn:
    def __init__(self, buf):
        fp = StringIO(buf)
        self.dir = read(fp, 0, 64).replace(b'\x00', '')
        self.ext = hexlify(read(fp, 0x40, 4))
        self.compsize = int_(read(fp, 0x44, 4))
        self.uncompsize = read(fp, 0x48, 3)
        self.unknown = hexlify(read(fp, 0x4b, 1))
        self.address = int_(read(fp, 0x4c, 4))

        if self.ext == '9ab22b24':
            self.dir = self.dir + '.gmd'
        elif self.ext == 'eb5d1f24':
            self.dir = self.dir + '.tex'
        elif self.ext == '0026462d':
            self.dir = self.dir + '.gfd'

offset = 0xc
dir = getcwd() + '\\'

for i in range(num):
    fp.seek(offset)
    buf = fp.read(0x50)
    jpn = Jpn(buf)
    offset = fp.tell()
    fp.seek(jpn.address)
    buf = fp.read(jpn.compsize)
    buf = decompress(buf)

    try:
        fp1 = open(dir + jpn.dir, 'wb')
    except IOError:
        makedirs(dirname(jpn.dir))
        fp1 = open(dir + jpn.dir, 'wb')

    fp1.write(buf)
    fp1.close()
    
    print '[*] No.:', i+1
    print '[+] Directory :', jpn.dir
    print '  [-] Extention       :', jpn.ext
    print '  [-] Compress size   :', jpn.compsize
    print '  [-] Uncompress size :', hexlify(jpn.uncompsize)
    print '  [!] Unknown         :', jpn.unknown
    print '  [-] Address         :', hex(jpn.address)
    print ''