Merge to XFA: Fix issues with != and == in fx_basic_wstring

core/src/fxcrt/fx_basic_wstring.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 <stddef.h>  // For offsetof().
 
 #include "../../include/fxcrt/fx_basic.h"
 #include "../../../third_party/base/numerics/safe_math.h"
@@ skipping 187 matching lines @@
     return *this;
 }
 const CFX_WideString& CFX_WideString::operator+=(const CFX_WideStringC& string)
 {
     if (string.IsEmpty()) {
         return *this;
     }
     ConcatInPlace(string.GetLength(), string.GetPtr());
     return *this;
 }
-bool operator==(const CFX_WideString& s1, FX_LPCWSTR s2)
+bool CFX_WideString::Equal(const wchar_t* ptr) const
 {
-    return s1.Equal(s2);
-}
-bool operator==(FX_LPCWSTR s1, const CFX_WideString& s2)
-{
-    return s2.Equal(s1);
-}
-bool operator==(const CFX_WideString& s1, const CFX_WideString& s2)
-{
-    return s1.Equal(s2);
-}
-bool operator==(const CFX_WideString& s1, const CFX_WideStringC& s2)
-{
-    return s1.Equal(s2);
-}
-bool operator==(const CFX_WideStringC& s1, const CFX_WideString& s2)
-{
-    return s2.Equal(s1);
-}
-bool operator != (const CFX_WideString& s1, FX_LPCWSTR s2)
-{
-    return !s1.Equal(s2);
-}
-bool operator!=(const CFX_WideString& s1, const CFX_WideString& s2)
-{
-    return !s1.Equal(s2);
-}
-bool operator!=(const CFX_WideString& s1, const CFX_WideStringC& s2)
-{
-    return !s1.Equal(s2);
-}
-bool operator!=(const CFX_WideStringC& s1, const CFX_WideString& s2)
-{
-    return !s2.Equal(s1);
+    if (!m_pData) {
+        return !ptr;
+    }
+    if (!ptr) {
+        return false;
+    }
+    return wcslen(ptr) == m_pData->m_nDataLength &&
+            wmemcmp(ptr, m_pData->m_String, m_pData->m_nDataLength) == 0;
 }
 bool CFX_WideString::Equal(const CFX_WideStringC& str) const
 {
     if (m_pData == NULL) {
         return str.IsEmpty();
     }
     return str.GetLength() == m_pData->m_nDataLength &&
-           FXSYS_memcmp32(str.GetPtr(), m_pData->m_String, m_pData->m_nDataLength * sizeof(FX_WCHAR)) == 0;
+        wmemcmp(str.GetPtr(), m_pData->m_String, m_pData->m_nDataLength) == 0;
+}
+bool CFX_WideString::Equal(const CFX_WideString& other) const
+{
+    if (!m_pData) {
+        return other.IsEmpty();
+    }
+    if (!other.m_pData) {
+        return false;
+    }
+    return other.m_pData->m_nDataLength == m_pData->m_nDataLength &&
+        wmemcmp(other.m_pData->m_String,
+                m_pData->m_String,
+                m_pData->m_nDataLength) == 0;
 }
 void CFX_WideString::Empty()
 {
     if (m_pData == NULL) {
         return;
     }
     if (m_pData->m_nRefs > 1) {
         m_pData->m_nRefs --;
     } else {
         FX_Free(m_pData);
@@ skipping 858 matching lines @@
             return (CFX_CharMap*)&g_DefaultJISMapper;
         case 936:
             return (CFX_CharMap*)&g_DefaultGBKMapper;
         case 949:
             return (CFX_CharMap*)&g_DefaultUHCMapper;
         case 950:
             return (CFX_CharMap*)&g_DefaultBig5Mapper;
     }
     return NULL;
 }