Introduction to libmagic

libmagic Is a development library used to identify file types based on file headers .

chestnuts

#include <magic.h>
#include <stdio.h>

int main(int argc, char **argv) {
  struct magic_set *cookie = NULL;

  cookie = magic_open(MAGIC_MIME);
  magic_load(cookie, NULL);
  puts(magic_file(cookie, argv[1]));
  magic_close(cookie);

  return 0;
}

compile

sudo apt install libmagic-dev

gcc -o main main.c -lmagic 

function

./main ~/ desktop /LibreOfficeDraw

result

application/vnd.oasis.opendocument.graphics; charset=binary

（SAW：Game Over！）