}
}
+impl<R: Read> LengthRead for FixedLengthReader<R> {
+ #[inline]
+ fn total_bytes(&self) -> u64 {
+ self.total_bytes
+ }
+}
+
/// A Read which tracks whether any bytes have been read at all. This allows us to distinguish
/// between "EOF reached before we started" and "EOF reached mid-read".
pub(crate) struct ReadTrackingReader<R: Read> {
fn read<R: Read>(reader: &mut R, params: P) -> Result<Self, DecodeError>;
}
+/// A std::io::Read that also provides the total bytes available to read.
+pub(crate) trait LengthRead: Read {
+ /// The total number of bytes available to read.
+ fn total_bytes(&self) -> u64;
+}
+
+/// A trait that various higher-level rust-lightning types implement allowing them to be read in
+/// from a Read given some additional set of arguments which is required to deserialize, requiring
+/// the implementer to provide the total length of the read.
+pub(crate) trait LengthReadableArgs<P> where Self: Sized
+{
+ /// Reads a Self in from the given LengthRead
+ fn read<R: LengthRead>(reader: &mut R, params: P) -> Result<Self, DecodeError>;
+}
+
/// A trait that various rust-lightning types implement allowing them to (maybe) be read in from a Read
///
/// (C-not exported) as we only export serialization to/from byte arrays instead