https://www.cnblogs.com/qytan36/archive/2010/09/27/1836569.html
Minus operator with char variable
https://stackoverflow.com/questions/7722834/minus-operator-with-char-variable
https://stackoverflow.com/questions/572547/what-does-static-mean-in-c
Static functions declared in “C” header files
https://stackoverflow.com/questions/42056160/static-functions-declared-in-c-header-files
__attribute__((packed))详解
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