[patch] MdeModulePkg/Browser: Enhance the logic when getting value from AltResp

[Dandan Bi <dandan.bi@intel.com>]

This patch is to enhance SetupBrowser to handle following two cases:
1. When searching BlockName in AltResp, the hex digits of related BlockName
   in AltResp may be in uppercase.
2. When converting the Value in AltResp to HiiValue, the length of value
   string is bigger than the length of StorageWidth of the question.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
---
 MdeModulePkg/Universal/SetupBrowserDxe/Setup.c | 54 +++++++++++++-------------
 1 file changed, 28 insertions(+), 26 deletions(-)

diff --git a/MdeModulePkg/Universal/SetupBrowserDxe/Setup.c b/MdeModulePkg/Universal/SetupBrowserDxe/Setup.c
index 6b38547..69fc41f 100644
--- a/MdeModulePkg/Universal/SetupBrowserDxe/Setup.c
+++ b/MdeModulePkg/Universal/SetupBrowserDxe/Setup.c
@@ -1427,44 +1427,41 @@ BufferToValue (
   }
   TempChar = *StringPtr;
   *StringPtr = L'\0';
 
   LengthStr = StrLen (Value);
+
+  if (LengthStr > (UINTN) Question->StorageWidth * 2) {
+    Length = (UINTN) Question->StorageWidth * 2;
+  } else {
+    Length = LengthStr;
+  }
   Status    = EFI_SUCCESS;
   if (!IsBufferStorage && IsString) {
     //
     // Convert Config String to Unicode String, e.g "0041004200430044" => "ABCD"
     // Add string tail char L'\0' into Length
     //
-    Length    = Question->StorageWidth + sizeof (CHAR16);
-    if (Length < ((LengthStr / 4 + 1) * 2)) {
-      Status = EFI_BUFFER_TOO_SMALL;
-    } else {
-      DstBuf = (CHAR16 *) Dst;
-      ZeroMem (TemStr, sizeof (TemStr));
-      for (Index = 0; Index < LengthStr; Index += 4) {
-        StrnCpyS (TemStr, sizeof (TemStr) / sizeof (CHAR16), Value + Index, 4);
-        DstBuf[Index/4] = (CHAR16) StrHexToUint64 (TemStr);
-      }
-      //
-      // Add tailing L'\0' character
-      //
-      DstBuf[Index/4] = L'\0';
+    DstBuf = (CHAR16 *) Dst;
+    ZeroMem (TemStr, sizeof (TemStr));
+    for (Index = 0; Index < Length; Index += 4) {
+      StrnCpyS (TemStr, sizeof (TemStr) / sizeof (CHAR16), Value + Index, 4);
+      DstBuf[Index/4] = (CHAR16) StrHexToUint64 (TemStr);
     }
+    //
+    // Add tailing L'\0' character
+    //
+    DstBuf[Index/4] = L'\0';
   } else {
-    if (Question->StorageWidth < ((LengthStr + 1) / 2)) {
-      Status = EFI_BUFFER_TOO_SMALL;
-    } else {
-      ZeroMem (TemStr, sizeof (TemStr));
-      for (Index = 0; Index < LengthStr; Index ++) {
-        TemStr[0] = Value[LengthStr - Index - 1];
-        DigitUint8 = (UINT8) StrHexToUint64 (TemStr);
-        if ((Index & 1) == 0) {
-          Dst [Index/2] = DigitUint8;
-        } else {
-          Dst [Index/2] = (UINT8) ((DigitUint8 << 4) + Dst [Index/2]);
-        }
+    ZeroMem (TemStr, sizeof (TemStr));
+    for (Index = 0; Index < Length; Index ++) {
+      TemStr[0] = Value[LengthStr - Index - 1];
+      DigitUint8 = (UINT8) StrHexToUint64 (TemStr);
+      if ((Index & 1) == 0) {
+        Dst [Index/2] = DigitUint8;
+      } else {
+        Dst [Index/2] = (UINT8) ((DigitUint8 << 4) + Dst [Index/2]);
       }
     }
   }
 
   *StringPtr = TempChar;
@@ -3755,10 +3752,15 @@ GetOffsetFromConfigResp (
   //
   // Type is EFI_HII_VARSTORE_EFI_VARIABLE or EFI_HII_VARSTORE_EFI_VARIABLE_BUFFER
   //
 
   //
+  // Convert all hex digits in ConfigResp to lower case before searching.
+  //
+  HiiToLower (ConfigResp);
+
+  //
   // 1. Directly use Question->BlockName to find.
   //
   RequestElement = StrStr (ConfigResp, Question->BlockName);
   if (RequestElement != NULL) {
     //
-- 
1.9.5.msysgit.1