Cocos Creator 2.X(Cocos2d-js)游戏资源目录分析&逆向还原

拿到了某变态服游戏，打开lib看到了libcocos2djs.so，判断版本为2.4。游戏把资源文件下载到了/data下，因此需要root。目录结构如下:

g4-start/
├── config.json
├── import
│   ├── 1e
│   │   └── 1ea6e4bcd.json
│   └── e7
│       └── e76cb2d2-fa48-4916-8c8c-d7f64ee0c948.json
└── native
    └── 1e
        └── 1ea6e4bcd.png

可以看到，文件名全部被改为了UUID，不利于处理。打开config.json，uuid项里竟然是Base64(但不是)！在cocos2d/core/utils/decode-uuid看到了对应的源码，成功还原uuid，再通过paths项还原目录结构。

贴一下还原uuid的python代码

#!/usr/bin/python3
import sys

# static sheets
i = [64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,62,64,64,64,63,52,53,54,55,56,57,58,59,60,61,64,64,64,64,64,64,64,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,64,64,64,64,64,64,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51]
a = ["", "", "", "", "", "", "", "", "-", "", "", "", "", "-", "", "", "", "", "-", "", "", "", "", "-", "", "", "", "", "", "", "", "", "", "", "", ""]
n = '0123456789abcdef'
s = [0, 1, 2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 14, 15, 16, 17, 19, 20, 21, 22, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35]

def decode_uuid(t):
    if len(t) != 22:
        return t #处理没有用uuid的情况

    a[0] = t[0]
    a[1] = t[1]
    r = 2
    for e in range(2, 22, 2):
        o = i[ord(t[e])]
        l = i[ord(t[e + 1])]
        a[s[r]] = n[o >> 2]
        a[s[r + 1]] = n[(3 & o) << 2 | l >> 4]
        a[s[r + 2]] = n[15 & l]
        r += 3
        
    return ''.join(a)

print(decode_uuid(sys.argv[1]))

完整代码整理中...