[PATCH 2/4] BaseTools/C/Common: Improve performance of boundary validation

[Shenglei Zhang <shenglei.zhang@intel.com>]

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>
---
 BaseTools/Source/C/Common/Decompress.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/BaseTools/Source/C/Common/Decompress.c b/BaseTools/Source/C/Common/Decompress.c
index 0e9ba0a982..adac66c5c2 100644
--- a/BaseTools/Source/C/Common/Decompress.c
+++ b/BaseTools/Source/C/Common/Decompress.c
@@ -254,12 +254,13 @@ Returns:
 
     if (Len <= TableBits) {
 
-      for (Index = Start[Len]; Index < NextCode; Index++) {
-        if (Index >= MaxTableLength) {
-          return (UINT16) BAD_TABLE;
-        }
-        Table[Index] = Char;
-      }
+	if (Start[Len] + NextCode > MaxTableLength) {
+	  return (UINT16) BAD_TABLE;
+	}
+	for (Index = Start[Len]; Index < NextCode; Index++) {
+	  Table[Index] = Char;
+	}
+
 
     } else {
 
-- 
2.18.0.windows.1