微信Dat文件如何用PYTHON解码

程序是从网上找来的，只是进行了一些完善，少了一些XOR的计算。

import os

path=r'C:\photo'

#dat文件保存的位置

def imageDecode(fpath,fn):
dat_read = open(fpath, "rb")
out=fpath+".png"
#png格式前面是89504E47
#jpg格式前面是FFD8FFE0
#gif格式前面是47494638
filetype="png"
first2=dat_read.read(2)
#先取前面的两位
#print(hex(first2[0]))
xor=0x00
png1=int(str(hex(first2[0])),16) ^ 0x89
png2=int(str(hex(first2[1])),16) ^ 0x50
if png1==png2:
xor=png1
filetype="png"
else:
jpg1=int(str(hex(first2[0])),16) ^ 0xFF
jpg2=int(str(hex(first2[1])),16) ^ 0xD8
if jpg1==jpg2:
filetype="jpg"
xor=jpg1
out=fpath+".jpg"
else:
gif1=int(str(hex(first2[0])),16) ^ 0x47
gif2=int(str(hex(first2[1])),16) ^ 0x49
if gif1==gif2:
filetype="gif"
xor=gif1
out=fpath+".gif"

 if xor>0x00:
     png_write = open(out, "wb")
     if filetype=="png":
         png_write.write(bytes([0x89]))
         png_write.write(bytes([0x50]))
     elif filetype=="jpg":
         png_write.write(bytes([0xFF]))
         png_write.write(bytes([0xD8]))
     elif filetype=="gif":
         png_write.write(bytes([0x47]))
         png_write.write(bytes([0x49]))
     for now in dat_read:        
         for nowByte in now:
             newByte = nowByte ^ int(str(hex(xor)),16)
             png_write.write(bytes([newByte]))        
     png_write.close()        
 dat_read.close()

def findFile(f):
fsinfo = os.listdir(f)

for fn in fsinfo:
     temp_path = os.path.join(f, fn)
     if not os.path.isdir(temp_path):            
         if fn[-4:]==".dat":
             print('文件路径: {}' .format(temp_path))
             imageDecode(temp_path,fn)
             #os.remove(temp_path)  #删除原dat文件
     else:
         findFile(temp_path)
         

findFile(path)