From 103979147253e60682f5beb80c116b6a1c7a178e Mon Sep 17 00:00:00 2001
From: Nicholas Nethercote <nnethercote@mozilla.com>
Date: Wed, 23 Jul 2014 22:17:56 -0700
Subject: [PATCH] Use Array.join to build up strings in readPostScriptTable().

This avoids about 5 MiB of string allocations on one test case.
---
 src/core/fonts.js | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/core/fonts.js b/src/core/fonts.js
index daf6257d4..3ac32be7b 100644
--- a/src/core/fonts.js
+++ b/src/core/fonts.js
@@ -3430,13 +3430,14 @@ var Font = (function FontClosure() {
               break;
             }
             var customNames = [];
+            var strBuf = [];
             while (font.pos < end) {
               var stringLength = font.getByte();
-              var string = '';
+              strBuf.length = stringLength;
               for (i = 0; i < stringLength; ++i) {
-                string += String.fromCharCode(font.getByte());
+                strBuf[i] = String.fromCharCode(font.getByte());
               }
-              customNames.push(string);
+              customNames.push(strBuf.join(''));
             }
             glyphNames = [];
             for (i = 0; i < numGlyphs; ++i) {