From 03e44c9995ffa6bc2249c8d6acbf479a56db57f2 Mon Sep 17 00:00:00 2001
From: Gian-Carlo Pascutto <gpascutto@mozilla.com>
Date: Mon, 24 Nov 2014 08:38:14 +0100
Subject: [PATCH] Bug 1102687 - Presize the urlclassifier PrefixSet delta array
 on loading. r=dmajor

---
 toolkit/components/url-classifier/nsUrlClassifierPrefixSet.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/toolkit/components/url-classifier/nsUrlClassifierPrefixSet.cpp b/toolkit/components/url-classifier/nsUrlClassifierPrefixSet.cpp
index 2b24aa5b92c9..323e53e2e12a 100644
--- a/toolkit/components/url-classifier/nsUrlClassifierPrefixSet.cpp
+++ b/toolkit/components/url-classifier/nsUrlClassifierPrefixSet.cpp
@@ -300,7 +300,7 @@ nsUrlClassifierPrefixSet::LoadFromFd(AutoFDClose& fileFd)
     nsTArray<uint32_t> indexStarts;
     indexStarts.SetLength(indexSize);
     mIndexPrefixes.SetLength(indexSize);
-    mIndexDeltas.Clear();
+    mIndexDeltas.SetLength(indexSize);
 
     mTotalPrefixes = indexSize;
 
@@ -313,7 +313,6 @@ nsUrlClassifierPrefixSet::LoadFromFd(AutoFDClose& fileFd)
       return NS_ERROR_FILE_CORRUPTED;
     }
     for (uint32_t i = 0; i < indexSize; i++) {
-      mIndexDeltas.AppendElement();
       uint32_t numInDelta = i == indexSize - 1 ? deltaSize - indexStarts[i]
                                : indexStarts[i + 1] - indexStarts[i];
       if (numInDelta > 0) {