From d717fde5cae1daa2d3369e1ed7c84f735cc926ad Mon Sep 17 00:00:00 2001
From: Carl Lerche <me@carllerche.com>
Date: Tue, 25 Oct 2016 20:09:54 -0700
Subject: [PATCH] Fix `remaining`

---
 src/imp/buf/mod.rs | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/imp/buf/mod.rs b/src/imp/buf/mod.rs
index 44c20f0..04c4ed2 100644
--- a/src/imp/buf/mod.rs
+++ b/src/imp/buf/mod.rs
@@ -635,7 +635,14 @@ impl<T: io::Write> WriteExt for T {
 
 impl<T: AsRef<[u8]>> Buf for io::Cursor<T> {
     fn remaining(&self) -> usize {
-        self.get_ref().as_ref().len() - self.position() as usize
+        let len = self.get_ref().as_ref().len();
+        let pos = self.position();
+
+        if pos >= len as u64 {
+            return 0;
+        }
+
+        len - pos as usize
     }
 
     fn bytes(&self) -> &[u8] {
@@ -653,7 +660,7 @@ impl<T: AsRef<[u8]>> Buf for io::Cursor<T> {
 impl<T: AsMut<[u8]> + AsRef<[u8]>> MutBuf for io::Cursor<T> {
 
     fn remaining(&self) -> usize {
-        self.get_ref().as_ref().len() - self.position() as usize
+        Buf::remaining(self)
     }
 
     /// Advance the internal cursor of the MutBuf