From 0b80624939da8f53466078de1ae320f120e34a35 Mon Sep 17 00:00:00 2001
From: Pierre Chifflier <chifflier@wzdftpd.net>
Date: Thu, 6 Jun 2019 09:08:56 +0200
Subject: [PATCH] Add consume_noshift (consume data without moving it)

---
 src/lib.rs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/lib.rs b/src/lib.rs
index 8e13fae..1b0e13d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -140,6 +140,16 @@ impl Buffer {
     cnt
   }
 
+  /// advances the position tracker
+  ///
+  /// This method is similar to `consume()` but will not move data
+  /// to the beginning of the buffer
+  pub fn consume_noshift(&mut self, count: usize) -> usize {
+    let cnt        = cmp::min(count, self.available_data());
+    self.position += cnt;
+    cnt
+  }
+
   /// after having written data to the buffer, use this function
   /// to indicate how many bytes were written
   ///
@@ -394,4 +404,12 @@ mod tests {
     assert_eq!(b.available_data(), 3);
     println!("{:?}", b.position());
   }
+
+  #[test]
+  fn consume_without_shift() {
+    let mut b = Buffer::with_capacity(10);
+    let _ = b.write(&b"abcdefgh"[..]);
+    b.consume_noshift(6);
+    assert_eq!(b.position(), 6);
+  }
 }