use crate::blocks::PcapBlock;
use crate::capture_pcap::LegacyPcapReader;
use crate::capture_pcapng::PcapNGReader;
use crate::error::PcapError;
use crate::linktype::Linktype;
use crate::pcap::parse_pcap_header;
use crate::pcapng::parse_sectionheaderblock;
use crate::traits::PcapReaderIterator;
use circular::Buffer;
use std::io::Read;
pub trait Capture {
fn get_datalink(&self) -> Linktype;
fn get_snaplen(&self) -> u32;
fn iter<'a>(&'a self) -> Box<dyn Iterator<Item = PcapBlock> + 'a>;
}
pub fn create_reader<'b, R>(
capacity: usize,
mut reader: R,
) -> Result<Box<dyn PcapReaderIterator + 'b>, PcapError<&'static [u8]>>
where
R: Read + 'b,
{
let mut buffer = Buffer::with_capacity(capacity);
let sz = reader.read(buffer.space()).or(Err(PcapError::ReadError))?;
if sz == 0 {
return Err(PcapError::Eof);
}
buffer.fill(sz);
if parse_sectionheaderblock(buffer.data()).is_ok() {
return PcapNGReader::from_buffer(buffer, reader)
.map(|r| Box::new(r) as Box<dyn PcapReaderIterator>);
}
match parse_pcap_header(buffer.data()) {
Ok(_) => LegacyPcapReader::from_buffer(buffer, reader)
.map(|r| Box::new(r) as Box<dyn PcapReaderIterator>),
Err(nom::Err::Incomplete(_)) => Err(PcapError::Incomplete),
_ => Err(PcapError::HeaderNotRecognized),
}
}