小编Nit*_*ian的帖子

在阅读一些CTF写作时,我遇到了这个脚本

#!/usr/bin/env python
import struct
import Image
import dpkt

INIT_X, INIT_Y = 100, 400

def print_map(pcap, device):
    picture = Image.new("RGB", (1200, 500), "white")
    pixels = picture.load() 

    x, y = INIT_X, INIT_Y

    for ts, buf in pcap:
        device_id, = struct.unpack("b", buf[0x0B])

        if device_id != device:
            continue

        data = struct.unpack("bbbb", buf[-4:])

        status = data[0]
        x = x + data[1]
        y = y + data[2]

        if (status == 1):
            for i in range(-5, 5):
                for j in range(-5, 5):
                    pixels[x + i , …