Use std::unordered_map for CFDE_CSSStyleSheet::m_StringCache

xfa/fde/css/fde_cssdeclaration.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 "xfa/fde/css/fde_cssdeclaration.h"
 
 #include "core/fxcrt/include/fx_ext.h"
 #include "xfa/fgas/crt/fgas_system.h"
@@ skipping 35 matching lines @@
   }
   wsName = pProperty->pwsName;
   wsValue = pProperty->pwsValue;
   pos = (FX_POSITION)pProperty->pNext;
 }
 const FX_WCHAR* CFDE_CSSDeclaration::CopyToLocal(
     const FDE_CSSPROPERTYARGS* pArgs,
     const FX_WCHAR* pszValue,
     int32_t iValueLen) {
   ASSERT(iValueLen > 0);
-  CFX_MapPtrToPtr* pCache = pArgs->pStringCache;
-  void* pKey = NULL;
+  std::unordered_map<uint32_t, FX_WCHAR*>* pCache = pArgs->pStringCache;
+  uint32_t key = 0;
   if (pCache) {
-    void* pszCached = NULL;
-    pKey = (void*)(uintptr_t)FX_HashCode_GetW(
-        CFX_WideStringC(pszValue, iValueLen), false);
-    if (pCache->Lookup(pKey, pszCached)) {
-      return (const FX_WCHAR*)pszCached;
-    }
+    key = FX_HashCode_GetW(CFX_WideStringC(pszValue, iValueLen), false);
+    auto it = pCache->find(key);
+    if (it != pCache->end())
+      return it->second;
   }
   FX_WCHAR* psz =
       (FX_WCHAR*)pArgs->pStaticStore->Alloc((iValueLen + 1) * sizeof(FX_WCHAR));
-  if (psz == NULL) {
-    return NULL;
-  }
   FXSYS_wcsncpy(psz, pszValue, iValueLen);
   psz[iValueLen] = '\0';
-  if (pCache) {
-    pCache->SetAt(pKey, psz);
-  }
+  if (pCache)
+    (*pCache)[key] = psz;
+
   return psz;
 }
 IFDE_CSSPrimitiveValue* CFDE_CSSDeclaration::NewNumberValue(
     IFX_MemoryAllocator* pStaticStore,
     FDE_CSSPRIMITIVETYPE eUnit,
     FX_FLOAT fValue) const {
   static CFDE_CSSPrimitiveValue s_ZeroValue(FDE_CSSPRIMITIVETYPE_Number, 0.0f);
   if (eUnit == FDE_CSSPRIMITIVETYPE_Number && FXSYS_fabs(fValue) < 0.001f) {
     return &s_ZeroValue;
   }
@@ skipping 1284 matching lines @@
     return FALSE;
   } else if (pOverflowY == NULL) {
     pOverflowY = NewEnumValue(pStaticStore, pOverflowX->GetEnum());
   }
   AddPropertyHolder(pStaticStore, FDE_CSSPROPERTY_OverflowX, pOverflowX,
                     bImportant);
   AddPropertyHolder(pStaticStore, FDE_CSSPROPERTY_OverflowY, pOverflowY,
                     bImportant);
   return TRUE;
 }