serde_epee 0.1.3

// From: https://stackoverflow.com/questions/42187591/how-to-keep-track-of-how-many-bytes-written-when-using-stdiowrite

pub struct ByteCounter<W> {
	inner: W,
	count: usize,
}

impl<W> ByteCounter<W>
	where W: std::io::Write
{
	pub fn new(inner: W) -> Self {
		ByteCounter {
			inner: inner,
			count: 0,
		}
	}

    /*
	pub fn into_inner(self) -> W {
		self.inner
	}
    */

	pub fn bytes_written(&self) -> usize {
		self.count
	}
}

impl<W> std::io::Write for ByteCounter<W>
	where W: std::io::Write
{
	fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
		let res = self.inner.write(buf);
		if let Ok(size) = res {
			self.count += size
		}
		res
	}

	fn flush(&mut self) -> std::io::Result<()> {
		self.inner.flush()
	}
}