From 60baee5585d07fc5d7526b7b64e85e742cd4ed3e Mon Sep 17 00:00:00 2001
From: Yuriy Glukhov <yglukhov@users.noreply.github.com>
Date: Fri, 12 Aug 2016 16:17:16 +0300
Subject: [PATCH] Optimised png decoding

---
 nimz.nim | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/nimz.nim b/nimz.nim
index 79354fd..201b6fa 100644
--- a/nimz.nim
+++ b/nimz.nim
@@ -1221,8 +1221,8 @@ proc nzDeflateInit*(input: string): nzStream =
 
 proc nzInflateInit*(input: string): nzStream =
   var nz = nzInit()
-  nz.data = ""
-  nz.bits.data = input
+  nz.data = newStringOfCap(1024 * 1024 * 5) # Allocate 5MB in advance
+  shallowCopy(nz.bits.data, input)
   nz.bits.bitpointer = 0
   nz.bits.databitlen = input.len * 8
   nz.mode = nzsInflate