This project forked from xiaoyeqiannian/wechart_img_convertor
pc版微信dat文件转图片
dat文件和源图片文件就是用某个数按字节异或了一下，异或回来就可以了
A ^ B = C
B ^ C = A
A ^ C = B
假设png文件头是A，dat文件是C，用A和C文件头的字节异或就可以得出B，因 为图片的格式以png，jpg，gif为主，通过这三种文件格式的头两个字节和待 转换文件的头两个字节一一异或的结果相等就找到B了，同时也知道了文件的 格式
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