1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
#include <cabinet/magic.hpp>
#include <fcntl.h>
#include <unistd.h>
#include <array>
#include <cerrno>
#include <cstddef>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <print>
using flags = cab::magic::flags;
auto main(int argc, char ** argv) -> int
{
if (argc != 2)
{
std::println(std::cerr, "Expected a filename");
return EXIT_FAILURE;
}
auto magic = cab::magic::open(flags::follow_symlinks | flags::mime_type | flags::forward_errors);
if (!magic)
{
std::println(std::cerr, "Failed to initialize libmagic: {}", magic.error().message());
return EXIT_FAILURE;
}
auto fd = ::open(argv[1], O_RDONLY);
if (fd < 0)
{
std::println(std::cerr, "Failed to determine file type: {}", ::strerror(errno));
return EXIT_FAILURE;
}
std::array<std::byte, 512> buffer{};
::read(fd, buffer.data(), buffer.size());
auto mime_type = magic->process(buffer);
if (!mime_type)
{
std::println(std::cerr, "Failed to determine file type: {}", mime_type.error().message());
return EXIT_FAILURE;
}
std::println("{}: {}", argv[1], mime_type.value());
}
|
