usb mouse move

draw.py

import struct
from PIL import Image
import dpkt
import binascii

INIT_X, INIT_Y = 1000, 1000

def compliment(h):
    i = int(h, 16)
    return i - ((0x80 & i) << 1)

def print_map(pcap, device):
    picture = Image.new("RGB", (2200, 2500), "white")
    pixels = picture.load()

    x, y = INIT_X, INIT_Y

    for ts, buf in pcap:
        mouse_data = buf[27:32]
        mdstr = binascii.hexlify(mouse_data);
        ml = len(mdstr)
        if ml != 8:
            continue
        bits = int(mdstr[0] + mdstr[1],base=16)
        bx = compliment(mdstr[2] + mdstr[3])
        by = compliment(mdstr[4] + mdstr[5])

        if bx > 20:
            continue
        if by > 20:
            continue

        status = bits
        x = x + bx
        y = y + by

        if (status == 1):
            for i in range(-5, 5):
                for j in range(-5, 5):
                    pixels[x + i , y + j] = (0, 0, 0, 0)
        else:
            pixels[x, y] = (255, 0, 0, 0)
    picture.save("out.png", "PNG")

if __name__ == "__main__":

    f = open("1.pcap", "rb")
    pcap = dpkt.pcap.Reader(f)

    print_map(pcap, 3)
    f.close()