From 95dcd11dde4fff1ad69b5b5bd9e6c55a9ff1c4a0 Mon Sep 17 00:00:00 2001
From: Brian White <mscdex@mscdex.net>
Date: Mon, 1 Jul 2013 05:42:19 -0400
Subject: [PATCH] zlib: allow zero values for level and strategy

This is a back-port of commit c9644fb from the master branch.
---
 lib/zlib.js | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/lib/zlib.js b/lib/zlib.js
index c9263142de..a1896baeb8 100644
--- a/lib/zlib.js
+++ b/lib/zlib.js
@@ -298,10 +298,16 @@ function Zlib(opts, mode) {
     self.emit('error', error);
   };
 
+  var level = exports.Z_DEFAULT_COMPRESSION;
+  if (typeof opts.level === 'number') level = opts.level;
+
+  var strategy = exports.Z_DEFAULT_STRATEGY;
+  if (typeof opts.strategy === 'number') strategy = opts.strategy;
+
   this._binding.init(opts.windowBits || exports.Z_DEFAULT_WINDOWBITS,
-                     opts.level || exports.Z_DEFAULT_COMPRESSION,
+                     level,
                      opts.memLevel || exports.Z_DEFAULT_MEMLEVEL,
-                     opts.strategy || exports.Z_DEFAULT_STRATEGY,
+                     strategy,
                      opts.dictionary);
 
   this._buffer = new Buffer(this._chunkSize);