binhex-rs 0.1.1

Crate to read BinHex 4 encoded files
Documentation 
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pub(crate) const TABLE: [Entry; 256] = build_lookup_table();
const CHARACTERS: &[u8; 64] = b"!\"#$%&'()*+,-012345689@ABCDEFGHIJKLMNPQRSTUVXYZ[`abcdefhijklmpqr";

#[derive(Clone, Copy, Debug)]
pub(crate) enum Entry {
    Invalid,
    Ended,
    Ignore,
    Valid(u8),
}

const fn build_lookup_table() -> [Entry; 256] {
    let mut table = [Entry::Invalid; 256];

    table[b':' as usize] = Entry::Ended;
    table[b'\r' as usize] = Entry::Ignore;
    table[b'\n' as usize] = Entry::Ignore;

    let mut i = 0;
    loop {
        if i == CHARACTERS.len() {
            return table;
        }

        table[CHARACTERS[i] as usize] = Entry::Valid(i as u8);

        i += 1;
    }
}