From 716c907dc2cd5c1289a60889c28d778464cd9fa8 Mon Sep 17 00:00:00 2001
From: debris <marek.kotewicz@gmail.com>
Date: Thu, 26 Nov 2015 18:36:28 +0100
Subject: [PATCH] when rewriting the buffer, reserve enougth space

---
 src/rlp.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/rlp.rs b/src/rlp.rs
index 03a10348c..3e29b783b 100644
--- a/src/rlp.rs
+++ b/src/rlp.rs
@@ -459,6 +459,8 @@ impl BasicEncoder {
     fn insert_list_len_at_pos(&mut self, len: usize, pos: usize) -> () {
         // new bytes
         let mut res: Vec<u8> = vec![];
+        // reserve a space equal at least current space + space for length
+        res.reserve(self.bytes.len() + 1);
         {
             let (before_slice, after_slice) = self.bytes.split_at(pos); 
             res.extend(before_slice);