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"""
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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，
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A ^ B = C
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B ^ C = A
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A ^ C = B
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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
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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
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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
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格式
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"""
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import os
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import binascii
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from datetime import datetime
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def get_top_2hex(path):
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"""
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获取文件的前两个16进制数
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"""
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data = open(path,'rb')
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hexstr = binascii.b2a_hex(data.read(2))
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return str(hexstr[:2], 'utf8'), str(hexstr[2:4], 'utf8')
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"""
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JPG文件头16进制为0xFFD8FF
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PNG文件头16进制为0x89504E
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GIF文件头16进制为0x474946
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"""
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def parse(dir):
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firstV, nextV = get_top_2hex(dir)
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firstV = int(firstV, 16)
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nextV = int(nextV, 16)
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coder = firstV ^ 0xFF
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kind = 'jpg'
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if firstV ^ 0xFF == nextV ^ 0xD8:
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coder = firstV ^ 0xFF
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kind = 'jpg'
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elif firstV ^ 0x89 == nextV ^ 0x50:
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coder = firstV ^ 0x89
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kind = 'png'
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elif firstV ^ 0x47 == nextV ^ 0x49:
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coder = firstV ^ 0x47
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kind = 'gif'
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return coder, kind
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def convert(path, file_name):
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file_path = os.path.join(path, file_name)
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mk_time = datetime.fromtimestamp(os.path.getmtime(file_path)).strftime('%Y-%m-%d %H.%M.%S')
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coder, kind = parse(file_path)
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dir_name = path.split('\\')[-1]
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if not os.path.exists(dir_name):
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os.mkdir(dir_name)
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dat = open(file_path, "rb")
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pic = open(dir_name + '\\' + mk_time + '-' + file_name[:10] + '.' + kind, "wb")
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for cur in dat:
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for item in cur:
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pic.write(bytes([item ^ coder]))
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dat.close()
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|
pic.close()
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|
def do(path):
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|
files = os.listdir(path)
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|
print('total files:{}'.format(len(files)))
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|
|
i = 0
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|
|
for file_name in files:
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|
try:
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|
print('{} ... {}'.format(i, file_name))
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|
convert(path, file_name)
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|
i+=1
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except:
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|
|
pass
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|
|
if __name__=="__main__":
|
|
|
do(r"C:\Users\Administrator\Documents\WeChat Files\wxid_hyjv4sqk0uho22\FileStorage\Image\2020-04") |