rtp-parse 0.1.0

use std::{
    fmt::{Debug, LowerHex},
    io::Seek,
    ops::Range,
};

use bit_cursor::{bit_cursor::BitCursor, bit_read::BitRead, bit_write::BitWrite};
use bitvec::{order::Msb0, slice::BitSlice, vec::BitVec};

pub mod rtcp;
pub mod rtp;
pub mod util;

pub trait PacketBuffer: BitRead + Seek + Debug + LowerHex {
    /// Return the current cursor position of this buffer
    fn position(&self) -> u64;

    /// How many bytes remaining in this buffer.
    fn bytes_remaining(&self) -> usize;

    /// Get a sub buffer of this one, corresponding to the given range.  Note that advances in the
    /// given sub-buffer's position wll _not_ be reflected in the parent; you'll need to seek
    /// manually.
    ///
    /// # Example:
    /// TODO
    ///
    fn sub_buffer(&self, range: Range<usize>) -> impl PacketBuffer;
}

impl PacketBuffer for BitCursor<BitVec<u8, Msb0>> {
    fn position(&self) -> u64 {
        BitCursor::position(self)
    }

    fn bytes_remaining(&self) -> usize {
        self.remaining_slice().len() / 8
    }

    fn sub_buffer(&self, range: Range<usize>) -> impl PacketBuffer {
        self.sub_cursor(range)
    }
}

impl PacketBuffer for BitCursor<&BitSlice<u8, Msb0>> {
    fn position(&self) -> u64 {
        BitCursor::position(self)
    }

    fn bytes_remaining(&self) -> usize {
        self.remaining_slice().len() / 8
    }

    fn sub_buffer(&self, range: Range<usize>) -> impl PacketBuffer {
        self.sub_cursor(range)
    }
}

pub trait PacketBufferMut: PacketBuffer + BitWrite {}
impl<T> PacketBufferMut for T where T: PacketBuffer + BitWrite {}