rustls 0.5.5

Rustls is a modern TLS library written in Rust.
Documentation 
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use std::io;
use base64;
use key;
fn extract<A>(rd: &mut io::BufRead,
              start_mark: &str,
              end_mark: &str,
              f: &Fn(Vec<u8>) -> A)
              -> Result<Vec<A>, ()> {
    let mut ders = Vec::new();
    let mut b64buf = String::new();
    let mut take_base64 = false;

    let mut raw_line = Vec::<u8>::new();
    loop {
        raw_line.clear();
        let len = try!(rd.read_until(b'\n', &mut raw_line)
            .map_err(|_| ()));

        if len == 0 {
            return Ok(ders);
        }
        let line = String::from_utf8_lossy(&raw_line);

        if line.starts_with(start_mark) {
            take_base64 = true;
            continue;
        }

        if line.starts_with(end_mark) {
            take_base64 = false;
            let der = try!(base64::decode_ws(&b64buf).map_err(|_| ()));
            ders.push(f(der));
            b64buf = String::new();
            continue;
        }

        if take_base64 {
            b64buf.push_str(&line.trim());
        }
    }
}


/// Extract all the certificates from rd, and return a vec of bytevecs
/// containing the der-format contents.
pub fn certs(rd: &mut io::BufRead) -> Result<Vec<key::Certificate>, ()> {
    extract(rd,
            "-----BEGIN CERTIFICATE-----",
            "-----END CERTIFICATE-----",
            &|v| key::Certificate(v))
}

/// Extract all RSA private keys from rd, and return a vec of bytevecs
/// containing the der-format contents.
pub fn rsa_private_keys(rd: &mut io::BufRead) -> Result<Vec<key::PrivateKey>, ()> {
    extract(rd,
            "-----BEGIN RSA PRIVATE KEY-----",
            "-----END RSA PRIVATE KEY-----",
            &|v| key::PrivateKey(v))
}