[PATCH 4/4] MdePkg/BaseUefiDecompressLib: 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: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com>
---
 .../Library/BaseUefiDecompressLib/BaseUefiDecompressLib.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.c b/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.c
index c1e8c5581a..e979b18f0f 100644
--- a/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.c
+++ b/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.c
@@ -222,10 +222,10 @@ MakeTable (
 
     if (Len <= TableBits) {
 
-      for (Index = Start[Len]; Index < NextCode; Index++) {
-        if (Index >= MaxTableLength) {
-          return (UINT16) BAD_TABLE;
-        }
+      if (Start[Len] + NextCode > MaxTableLength) {
+        return (UINT16) BAD_TABLE;
+      }
+	  for (Index = Start[Len]; Index < NextCode; Index++) {
         Table[Index] = Char;
       }
 
-- 
2.18.0.windows.1