core/ difference with XFA (for information only).

core/src/fxcrt/fx_unicode.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 "core/include/fxcrt/fx_ucd.h"
 
 FX_DWORD FX_GetUnicodeProperties(FX_WCHAR wch) {
   size_t idx = static_cast<size_t>(wch);
   if (idx < kTextLayoutCodePropertiesSize)
     return kTextLayoutCodeProperties[(FX_WORD)wch];
   return 0;
 }
 
+#ifdef PDF_ENABLE_XFA
+FX_BOOL FX_IsCtrlCode(FX_WCHAR ch) {
+  FX_DWORD dwRet = (FX_GetUnicodeProperties(ch) & FX_CHARTYPEBITSMASK);
+  return dwRet == FX_CHARTYPE_Tab || dwRet == FX_CHARTYPE_Control;
+}
+
+#endif
 FX_WCHAR FX_GetMirrorChar(FX_WCHAR wch, FX_BOOL bRTL, FX_BOOL bVertical) {
   FX_DWORD dwProps = FX_GetUnicodeProperties(wch);
   FX_DWORD dwTemp = (dwProps & 0xFF800000);
   if (bRTL && dwTemp < 0xFF800000) {
     size_t idx = dwTemp >> 23;
     if (idx < kFXTextLayoutBidiMirrorSize) {
       wch = kFXTextLayoutBidiMirror[idx];
       dwProps = FX_GetUnicodeProperties(wch);
     }
   }
   if (bVertical) {
     dwTemp = (dwProps & 0x007E0000);
     if (dwTemp < 0x007E0000) {
       size_t idx = dwTemp >> 17;
       if (idx < kFXTextLayoutVerticalMirrorSize)
         wch = kFXTextLayoutVerticalMirror[idx];
     }
   }
   return wch;
 }
+#ifdef PDF_ENABLE_XFA
+
+FX_WCHAR FX_GetMirrorChar(FX_WCHAR wch,
+                          FX_DWORD dwProps,
+                          FX_BOOL bRTL,
+                          FX_BOOL bVertical) {
+  FX_DWORD dwTemp = (dwProps & 0xFF800000);
+  if (bRTL && dwTemp < 0xFF800000) {
+    size_t idx = dwTemp >> 23;
+    if (idx < kFXTextLayoutBidiMirrorSize) {
+      wch = kFXTextLayoutBidiMirror[idx];
+      dwProps = FX_GetUnicodeProperties(wch);
+    }
+  }
+  if (bVertical) {
+    dwTemp = (dwProps & 0x007E0000);
+    if (dwTemp < 0x007E0000) {
+      size_t idx = dwTemp >> 17;
+      if (idx < kFXTextLayoutVerticalMirrorSize)
+        wch = kFXTextLayoutVerticalMirror[idx];
+    }
+  }
+  return wch;
+}
+#endif