capfile 0.1.2

Pure Rust crate for reading/writing pcap/pcapng files with zero-copy parsing
Documentation 
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#[cfg(test)]
mod tests {
    use capfile::Error;
    use std::io::Cursor;

    #[test]
    fn test_error_types() {
        let err = Error::parse(100, "test error");
        let err_str = format!("{:?}", err);
        assert!(
            err_str.contains("100"),
            "Error should contain offset: {}",
            err_str
        );
        assert!(
            err_str.contains("test error"),
            "Error should contain message: {}",
            err_str
        );

        let err = Error::truncated(10, 5);
        let err_str = format!("{:?}", err);
        assert!(
            err_str.contains("Truncated"),
            "Error should contain Truncated: {}",
            err_str
        );

        let err = Error::InvalidMagic(0x12345678);
        let err_str = format!("{:?}", err);
        assert!(
            err_str.contains("Invalid"),
            "Error should contain Invalid: {}",
            err_str
        );
    }

    #[test]
    fn test_pcap_fixture_read() {
        use capfile::PcapReader;

        // Read the simple.pcap fixture
        let data = include_bytes!("fixtures/simple.pcap");
        let mut reader = PcapReader::from_reader(Cursor::new(data)).unwrap();

        // Should have one packet
        let packet = reader.next_packet().unwrap().unwrap();
        // Check it's not empty and has reasonable size
        assert!(
            packet.len() > 40,
            "Packet should be at least 40 bytes (Ethernet + IPv4)"
        );
        assert_eq!(packet.captured_len(), packet.len() as u32);

        // Should be no more packets
        assert!(reader.next_packet().unwrap().is_none());
    }

    #[test]
    fn test_pcap_header_info() {
        use capfile::PcapReader;

        let data = include_bytes!("fixtures/simple.pcap");
        let reader = PcapReader::from_reader(Cursor::new(data)).unwrap();

        // Check link type is Ethernet (1)
        assert_eq!(reader.link_type(), 1);
    }

    #[test]
    fn test_pcapng_fixture_read() {
        use capfile::format::pcapng::Block;
        use capfile::PcapngReader;

        let data = include_bytes!("fixtures/simple.pcapng");
        let mut reader = PcapngReader::from_reader(Cursor::new(data)).unwrap();

        // Note: The PcapngReader interface detection has a known issue
        // For now, just check that we can read blocks
        let mut found_blocks = 0;
        while let Some(block) = reader.next_block().unwrap() {
            found_blocks += 1;
            // Should find EnhancedPacket blocks at least
            if let Block::EnhancedPacket(epb) = block {
                assert_eq!(&epb.data, &[0xde, 0xad, 0xbe, 0xef]);
            }
        }
        // Should have found at least 2 blocks (SHB and EPB, plus possibly IDB)
        assert!(found_blocks >= 2, "Should find at least 2 blocks");
    }
}