From 55756c88aec9d3269d8544746907838ba921e90b Mon Sep 17 00:00:00 2001
From: Shenglei Zhang <shenglei.zhang@intel.com>
Date: Mon, 25 Feb 2019 13:53:37 +0800
Subject: BaseTools/C/Common: Improve performance of boundary validation

The boundary validation checking in MakeTable() performs on
every loop iteration. This could be improved by checking
just once before the loop.
https://bugzilla.tianocore.org/show_bug.cgi?id=1329

Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
---
 BaseTools/Source/C/Common/Decompress.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

(limited to 'BaseTools')

diff --git a/BaseTools/Source/C/Common/Decompress.c b/BaseTools/Source/C/Common/Decompress.c
index 0e9ba0a982..e9ac1d58b3 100644
--- a/BaseTools/Source/C/Common/Decompress.c
+++ b/BaseTools/Source/C/Common/Decompress.c
@@ -254,10 +254,11 @@ Returns:
 
     if (Len <= TableBits) {
 
+      if (Start[Len] >= NextCode || NextCode > MaxTableLength){
+        return (UINT16) BAD_TABLE;
+      }
+
       for (Index = Start[Len]; Index < NextCode; Index++) {
-        if (Index >= MaxTableLength) {
-          return (UINT16) BAD_TABLE;
-        }
         Table[Index] = Char;
       }
 
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