;
```

### Check for specific type class

```rust
let buf = [0xFF, 0xD8, 0xFF, 0xAA];
assert!(infer::is_image(&buf));
```

### Adds a custom file type matcher

Here we actually need to use the `Infer` struct to be able to declare custom matchers.

```rust
# #[cfg(feature = "alloc")]
# fn run() {
fn custom_matcher(buf: &[u8]) -> bool {
    return buf.len() >= 3 && buf[0] == 0x10 && buf[1] == 0x11 && buf[2] == 0x12;
}

let mut info = infer::Infer::new();
info.add("custom/foo", "foo", custom_matcher);

let buf = [0x10, 0x11, 0x12, 0x13];
let kind = info.get(&buf).unwrap();

assert_eq!(kind.mime_type(), "custom/foo");
assert_eq!(kind.extension(), "foo");
# }
```