Function secp256k1::ffi::secp256k1_ec_pubkey_parse

pub unsafe fn secp256k1_ec_pubkey_parse(
    cx: *const Context, 
    pk: *mut PublicKey, 
    input: *const u8, 
    in_len: usize
) -> i32

Parse 33/65 byte pubkey into PublicKey, losing compressed information