struct PcapStreamWriter{Dst <: IO} <: PcapWriter
    dst::Dst

    function PcapStreamWriter{Dst}(dst::Dst; thiszone = 0, snaplen = 65535, linktype = LINKTYPE_ETHERNET) where {Dst <: IO}
        h = PcapHeader(
            0xa1b23c4d,
            0x0002,
            0x0004,
            thiszone,
            0,
            snaplen,
            linktype)
            write(dst, reinterpret(UInt8, [h]))
        new(dst)
    end
end

PcapStreamWriter(io::IO; kwargs...) = PcapStreamWriter{typeof(io)}(io; kwargs...)
PcapStreamWriter(path::AbstractString; kwargs...) = PcapStreamWriter(open(path, "w"); kwargs...)

Base.close(x::PcapStreamWriter) = close(x.dst)

function Base.write(x::PcapStreamWriter, timestamp::UnixTime, data)
    sec, nsec = fldmod(Dates.value(timestamp), 1_000_000_000)
    data_length = length(data)
    h = RecordHeader(sec, nsec, data_length, data_length)
    write(x.dst, reinterpret(UInt8, [h]))
    write(x.dst, collect(data))
    nothing
end