bp7 0.3.7

Rust implementation of dtn bundle protocol 7 draft https://tools.ietf.org/html/draft-ietf-dtn-bpbis-13
Documentation 
use bp7::crc::CrcBlock;
use bp7::*;
#[test]
fn crc_valid_tests() {
    let mut b = helpers::rnd_bundle(dtntime::CreationTimestamp::now());
    b.set_crc(crc::CRC_NO);
    b.calculate_crc();
    assert!(b.crc_valid());

    b.set_crc(crc::CRC_16);
    b.calculate_crc();
    assert!(b.crc_valid());

    b.set_crc(crc::CRC_32);
    b.calculate_crc();
    assert!(b.crc_valid());
}

#[test]
fn crc_invalid_tests() {
    let mut b = helpers::rnd_bundle(dtntime::CreationTimestamp::now());

    b.set_crc(crc::CRC_16);
    b.calculate_crc();
    b.primary.set_crc(crc::CrcValue::Crc16([23, 42]));
    assert!(!b.crc_valid());

    b.set_crc(crc::CRC_32);
    b.calculate_crc();
    b.primary.set_crc(crc::CrcValue::Crc32([23, 42, 23, 42]));
    assert!(!b.crc_valid());
}