杂项部分
- 提取gif每一帧图片的脚本
from PIL import Image
import os
gifFileName = '456.gif'
im = Image.open(gifFileName)
pngDir = gifFileName[:-4]
os.mkdir(pngDir)
try:
while True:
current = im.tell()
im.save(pngDir+'/'+str(current)+'.png')
im.seek(current+1)
except EOFError:
pass
- 提取base64编码图片的信息转为二进制写入文件
import base64
f = open('123.txt',encoding='utf-8')
string = str(f.read())
x = base64.b64decode(string)
f.close()
f = open('result1.png','wb')
f.write(x)
- 碰撞CRC校验(长度部分)
import struct
import binascii
import oS
f = open("ba.png","rb")
m = f.read()
for i in range (1024) :
c = m[12:16] + struct. pack('>i', i) + m[20:29]
crc = binascii.crc32(c) & 0xffffffff
if crc == 0x7e7f049d:
print (i)
f. close ()