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* [PATCH] MdePkg/SafeString.c: Fix code to be more readable
@ 2017-03-06  7:24 Ruiyu Ni
  2017-03-06  7:27 ` Wu, Hao A
  0 siblings, 1 reply; 2+ messages in thread
From: Ruiyu Ni @ 2017-03-06  7:24 UTC (permalink / raw)
  To: edk2-devel; +Cc: Hao A Wu

The change doesn't impact the functionality.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
---
 MdePkg/Library/BaseLib/SafeString.c | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/MdePkg/Library/BaseLib/SafeString.c b/MdePkg/Library/BaseLib/SafeString.c
index b7895ad..249fe47 100644
--- a/MdePkg/Library/BaseLib/SafeString.c
+++ b/MdePkg/Library/BaseLib/SafeString.c
@@ -1234,6 +1234,7 @@ StrToIpv6Address (
         //
         // Uintn won't exceed MAX_UINT16 if number of hexadecimal digit characters is no more than 4.
         //
+        ASSERT (AddressIndex + 1 < ARRAY_SIZE (Address->Addr));
         LocalAddress.Addr[AddressIndex] = (UINT8) ((UINT16) Uintn >> 8);
         LocalAddress.Addr[AddressIndex + 1] = (UINT8) Uintn;
         AddressIndex += 2;
@@ -1286,11 +1287,13 @@ StrToIpv6Address (
   }
   CopyMem (&Address->Addr[0], &LocalAddress.Addr[0], CompressStart);
   ZeroMem (&Address->Addr[CompressStart], ARRAY_SIZE (Address->Addr) - AddressIndex);
-  CopyMem (
-    &Address->Addr[CompressStart + ARRAY_SIZE (Address->Addr) - AddressIndex],
-    &LocalAddress.Addr[CompressStart],
-    AddressIndex - CompressStart
-    );
+  if (AddressIndex > CompressStart) {
+    CopyMem (
+      &Address->Addr[CompressStart + ARRAY_SIZE (Address->Addr) - AddressIndex],
+      &LocalAddress.Addr[CompressStart],
+      AddressIndex - CompressStart
+      );
+  }
 
   if (PrefixLength != NULL) {
     *PrefixLength = LocalPrefixLength;
@@ -3204,6 +3207,7 @@ AsciiStrToIpv6Address (
         //
         // Uintn won't exceed MAX_UINT16 if number of hexadecimal digit characters is no more than 4.
         //
+        ASSERT (AddressIndex + 1 < ARRAY_SIZE (Address->Addr));
         LocalAddress.Addr[AddressIndex] = (UINT8) ((UINT16) Uintn >> 8);
         LocalAddress.Addr[AddressIndex + 1] = (UINT8) Uintn;
         AddressIndex += 2;
@@ -3256,11 +3260,13 @@ AsciiStrToIpv6Address (
   }
   CopyMem (&Address->Addr[0], &LocalAddress.Addr[0], CompressStart);
   ZeroMem (&Address->Addr[CompressStart], ARRAY_SIZE (Address->Addr) - AddressIndex);
-  CopyMem (
-    &Address->Addr[CompressStart + ARRAY_SIZE (Address->Addr) - AddressIndex],
-    &LocalAddress.Addr[CompressStart],
-    AddressIndex - CompressStart
-    );
+  if (AddressIndex > CompressStart) {
+    CopyMem (
+      &Address->Addr[CompressStart + ARRAY_SIZE (Address->Addr) - AddressIndex],
+      &LocalAddress.Addr[CompressStart],
+      AddressIndex - CompressStart
+      );

+  }
 
   if (PrefixLength != NULL) {
     *PrefixLength = LocalPrefixLength;
-- 
2.9.0.windows.1



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2017-03-06  7:24 [PATCH] MdePkg/SafeString.c: Fix code to be more readable Ruiyu Ni
2017-03-06  7:27 ` Wu, Hao A

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