代码不知道每一行的作用，希望能注释一下

#include<iostream>
#include<cstring>
using namespace std;
unsigned int Fun(unsigned char* buffer, int size)
{
    unsigned int x = 1;
    unsigned int p = x + (x << 1) + (x << 2) + (x << 4) + (x << 5) + (x << 7) + (x << 8) + (x << 10) + (x << 11) + (x << 12) + (x << 16) + (x << 22) + (x << 23) + (x << 26);
    unsigned int crc = 0;
    unsigned int now = 0;
    for (int i = 0; i < size; i++)
    {
        for (int j = 7; j >= 0; j--)
        {
            unsigned int q = 0;
            if ((now >> 31) & (unsigned int)1) q = p;
            now = (now << 1) | ((buffer[i] >> j) & (unsigned int)1);
            now = (now ^ q);
            crc = now;
        }
    }
    return crc;
}
int main() {
    unsigned char* a = new unsigned char[10];
    cin >> a;
    cout << Fun(a, strlen((const char*)a));
    return 0;
}

<<是左移,>> 是右移,其他都是调用函数。
有一个for循环。
include是导入c++本地库。