From 314c6b306038526209d284cf9fdbe978d2a634ec Mon Sep 17 00:00:00 2001
From: isaacs <i@izs.me>
Date: Thu, 4 Oct 2012 17:43:15 -0700
Subject: [PATCH] Don't allow invalid encodings in StringDecoder class

---
 lib/string_decoder.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/string_decoder.js b/lib/string_decoder.js
index 31d4b24702..6b1e30895a 100644
--- a/lib/string_decoder.js
+++ b/lib/string_decoder.js
@@ -19,8 +19,15 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+function assertEncoding(encoding) {
+  if (encoding && !Buffer.isEncoding(encoding)) {
+    throw new Error('Unknown encoding: ' + encoding);
+  }
+}
+
 var StringDecoder = exports.StringDecoder = function(encoding) {
   this.encoding = (encoding || 'utf8').toLowerCase().replace(/[-_]/, '');
+  assertEncoding(encoding);
   switch (this.encoding) {
     case 'utf8':
       // CESU-8 represents each of Surrogate Pair by 3-bytes