威望0
积分7946
贡献0
在线时间763 小时
UID1
注册时间2021-4-14
最后登录2024-11-21
管理员
- UID
- 1
- 威望
- 0
- 积分
- 7946
- 贡献
- 0
- 注册时间
- 2021-4-14
- 最后登录
- 2024-11-21
- 在线时间
- 763 小时
|
[mw_shl_code=python,true]import binascii
import struct
import sys
file = '图片.png'
fr = open(file,'rb').read() #以二进制来读取文件
data = bytearray(fr[0x0c:0x1d]) #图片的信息,从IHDR到crc前
crc32key = eval('0x'+str(binascii.b2a_hex(fr[0x1d:0x21]))[2:-1])
n = 4095
for w in range(n):
width = bytearray(struct.pack('>i', w))
for h in range(n):
height = bytearray(struct.pack('>i', h))
for x in range(4):
data[x+4] = width[x]
data[x+8] = height[x]
crc32result = binascii.crc32(data) & 0xffffffff
if crc32result == crc32key:
print(width,height)
newpic = bytearray(fr)
for x in range(4):
newpic[x+16] = width[x]
newpic[x+20] = height[x]
fw = open(file+'.png','wb')
fw.write(newpic)
fw.close
sys.exit()[/mw_shl_code] |
|