Add safe FX_Alloc2D() macro

core/src/fxcrt/fx_basic_array.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "../../include/fxcrt/fx_basic.h"
 #include "../../../third_party/base/numerics/safe_math.h"
 
 CFX_BasicArray::CFX_BasicArray(int unit_size)
@@ skipping 171 matching lines @@
     _ClearIndex(m_IndexDepth, m_IndexSize, (void**)m_pIndex);
     m_pIndex = NULL;
     m_IndexDepth = 0;
     m_DataSize = 0;
 }
 void* CFX_BaseSegmentedArray::Add()
 {
     if (m_DataSize % m_SegmentSize) {
         return GetAt(m_DataSize ++);
     }
-    void* pSegment = FX_Alloc(FX_BYTE, m_UnitSize * m_SegmentSize);
-    if (!pSegment) {
-        return NULL;
-    }
+    void* pSegment = FX_Alloc2D(FX_BYTE, m_UnitSize, m_SegmentSize);
     if (m_pIndex == NULL) {
         m_pIndex = pSegment;
         m_DataSize ++;
         return pSegment;
     }
     if (m_IndexDepth == 0) {
         void** pIndex = (void**)FX_Alloc(void*, m_IndexSize);
         if (pIndex == NULL) {
             FX_Free(pSegment);
             return NULL;
@@ skipping 142 matching lines @@
                 FX_Free(pIndex[i % m_IndexSize]);
                 pIndex[i % m_IndexSize] = NULL;
             }
         } else {
             FX_Free(m_pIndex);
             m_pIndex = NULL;
         }
     }
     m_DataSize -= count;
 }