1 files changed, 53 insertions, 0 deletions
diff --git a/src/deserialise/d_stream/mod.rs b/src/deserialise/d_stream/mod.rs
new file mode 100644
index 0000000..05ed6a2
--- /dev/null
+++ b/src/deserialise/d_stream/mod.rs
@@ -0,0 +1,53 @@
+// Copyright 2022-2024 Gabriel Bjørnager Jensen.
+
+use crate::error::{Error, Result};
+
+use std::fmt::{Debug, Formatter};
+
+#[derive(Clone)]
+pub struct DStream<'a> {
+	data: &'a [u8],
+	len:  usize,
+}
+
+impl DStream<'_> {
+	pub fn take(&mut self, len: usize) -> Result<&[u8]> {
+		if self.len < len { return Err(Error::EndOfDStream { len: self.len, ok_len: len } ) }
+
+		let start = self.data.len() - self.len;
+		let stop  = start + len;
+
+		self.len -= len;
+
+		Ok(&self.data[start..stop])
+	}
+}
+
+impl Debug for DStream<'_> {
+	fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
+		let stop  = self.data.len();
+		let start = self.data.len() - self.len;
+
+		write!(f, "[")?;
+
+		for v in &self.data[start..stop] { write!(f, "{v:#02X},")? };
+
+		write!(f, "]")?;
+
+		Ok(())
+	}
+}
+
+impl<'a> From<&'a [u8]> for DStream<'a> {
+	fn from(value: &'a [u8]) -> Self { Self {
+		data: value,
+		len:  value.len(),
+	} }
+}
+
+impl<'a, const N: usize> From<&'a [u8; N]> for DStream<'a> {
+	fn from(value: &'a [u8; N]) -> Self { Self {
+		data: value,
+		len:  N,
+	} }
+}