1、‘进制转换’
https://blog.csdn.net/diyu122222/article/details/80692904
https://blog.csdn.net/yuanxiang01/article/details/82503568
2、编码
https://wenku.baidu.com/view/f69d2a11b6360b4c2e3f5727a5e9856a56122626.html?from=search
https://wenku.baidu.com/view/22b836c0842458fb770bf78a6529647d272834ab.html?from=search
https://wenku.baidu.com/view/572f1d244b35eefdc8d333fa.html?rec_flag=default&sxts=1581043751076