Crate imghdr

Library that determines the type of image contained in a file or byte stream, basically the clone of the Python imghdr module.

No-std support

Can be used in no-std environments with disabled std feature (enabled by default).

Examples

Check the file directly:

match imghdr::from_file("./tests/images/example.png") {
    Ok(Some(imghdr::Type::Png)) => println!("Yep, it is a PNG"),
    Ok(..) => println!("Nope, it is definitely not a PNG"),
    Err(e) => println!("Some error happened: {:?}", e),
}

Or check the bytes stream:

let mut file = File::open("./tests/images/example.jpeg")?;
let mut content: Vec<u8> = vec![];
file.read_to_end(&mut content)?;

match imghdr::from_bytes(&content) {
    Some(imghdr::Type::Jpeg) => println!("And this is a Jpeg"),
    _ => println!("Can a Png, Bmp or other file format"),
}

It is not required to pass the fully read file into the crate functions, right now imghdr requires only first 12 bytes of contents for image format recognition.

Enums

Type	Recognized image types

Functions

from_bytes	Try to determine image format from a bytes slice.
from_file	Open file and try to determine if it is an image.
from_reader	Try to determine image format from an IO stream of bytes.