#include <stdio.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <err.h>

// Library header file
#include <magic.h>

int
main(int argc, char *argv[])
{
    static magic_t magic = NULL;
    struct stat st;

    int fd = open(argv[1], O_RDONLY);
    if (fstat(fd, &st) == -1)
	err(1, "fstat");
    size_t size = st.st_size;
    void *data = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
    if (data == (void *)-1)
	err(1, "mmap");

	

    // Open magic database
    if (magic == NULL)
    {
        magic = magic_open(MAGIC_NONE);
        if (magic == NULL)
        {
	    err(1, "magic_open");
        }

#if 0
        const char *mfile = "/path/to/magic";
        if (magic_load(magic, mfile) == -1)
        {
	    err(1, "magic_load");
        }
#endif
    }

    if (size == 0)
        return 0;

    // Get magic descriptor
    magic_descriptor(magic, fileno(fmemopen((void *)data, size, "rb")));

    // Load magic buffers
    magic_load_buffers(magic, (void **)&data, &size, 1);

    // Analyze magic buffer
    magic_buffer(magic, data, size);

    return 0;
}