Original zlib code: https://github.com/madler/zlib/blob/develop/contrib/puff/puf...

The code of the article: https://github.com/ieviev/mini-gzip/blob/main/src/main.rs

Top level declarations of the C code:

    #define MAXBITS 15   
    #define MAXLCODES 286
    #define MAXDCODES 30
    #define MAXCODES
    #define FIXLCODES 288

    struct state

    local int bits(struct state *s, int need)
    local int stored(struct state *s)

    struct huffman

    local int decode(...)
    local int construct(...)
    local int codes(...)

    local int fixed(...)
    local int dynamic(...)
    int puff(...)

Top level declarations of the Rust code:

    const MAXBITS: usize = 15;
    const MAXLCODES: usize = 286;
    const MAXDCODES: usize = 30;
    const FIXLCODES: usize = 288;
    const MAXDIST: usize = 32768;
    struct State<'a> 
    struct Huffman<'a>

    fn decode
    fn construct
    fn codes
    fn fixed
    fn dynamic
    fn stored
    pub fn inflate