58 city font encryption and decryption method

Reference 4 basic packages

import re
from io import BytesIO
from fontTools.ttLib import TTFont
import base64

Use regular to extract the following content, this is an encrypted font base64 font file

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#code_str 为第一图蓝色字符串
def deciphering(ziti,code_str):
    result = []
    code_ziti = []
    font = TTFont(BytesIO(base64.decodebytes(code_str.encode())))
    c = font['cmap'].tables[0].ttFont.tables['cmap'].tables[0].cmap

    for i in range(len(ziti)):        
        #找出每一个字对应的16进制编码 逐一和字体文件做判断
        str_code =ziti[i].encode("unicode-escape").decode()[-4:]

		# \xa0 是空格
        if(str_code =='\\xa0'):
            str_code = ' '

		# 如果标点符号，转化后还是标点符号 长度为1
		# 如果包含则转换 
        if(len(str_code)>1):
            code = int(str_code,16)
            if(code in c):
                x = int(c[code][-2:])-1
                result.append(x)
            else:
                result.append(ziti[i])
        else:
            result.append(ziti[i])

	#  最后将数组转为字符串
    return "".join(map(lambda x:str(x),result))