magical_rs 0.3.1

One of the best frameworks in the Rust ecosystem for file recognition, advanced customization, in every context from synchronous to asynchronous. Supports running in the most minimal environments. No dependencies, no limitations.
Documentation 
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const RIFF: &[u8; 4] = b"RIFF";
const WEBP: &[u8; 4] = b"WEBP";

#[must_use]
pub fn is_webp(bytes: &[u8]) -> bool {
    if bytes.len() < 12 {
        return false;
    }

    if &bytes[0..4] != RIFF {
        return false;
    }

    if &bytes[8..12] != WEBP {
        return false;
    }

    let file_size = match bytes.get(4..8) {
        Some([a, b, c, d]) => u32::from_le_bytes([*a, *b, *c, *d]) as usize,
        _ => return false,
    };

    file_size > 4
}