XFA: Manual merge of Clean up IFX_BidiChar

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 "../../include/fxcrt/fx_ucd.h"
 
 FX_DWORD FX_GetUnicodeProperties(FX_WCHAR wch) {
-  return kTextLayoutCodeProperties[(FX_WORD)wch];
+  size_t idx = static_cast<size_t>(wch);
+  if (idx < kTextLayoutCodePropertiesSize)
+    return kTextLayoutCodeProperties[(FX_WORD)wch];
+  return 0;
 }
+
 FX_BOOL FX_IsCtrlCode(FX_WCHAR ch) {
-  FX_DWORD dwRet =
-      (kTextLayoutCodeProperties[(FX_WORD)ch] & FX_CHARTYPEBITSMASK);
+  FX_DWORD dwRet = (FX_GetUnicodeProperties(ch) & FX_CHARTYPEBITSMASK);
   return dwRet == FX_CHARTYPE_Tab || dwRet == FX_CHARTYPE_Control;
 }
-FX_BOOL FX_IsRotationCode(FX_WCHAR ch) {
-  return (kTextLayoutCodeProperties[(FX_WORD)ch] & 0x8000) != 0;
-}
-FX_BOOL FX_IsCombinationChar(FX_WCHAR wch) {
-  FX_DWORD dwProps =
-      (kTextLayoutCodeProperties[(FX_WORD)wch] & FX_CHARTYPEBITSMASK);
-  return dwProps == FX_CHARTYPE_Combination;
-}
-FX_BOOL FX_IsBidiChar(FX_WCHAR wch) {
-  FX_DWORD dwProps = kTextLayoutCodeProperties[(FX_WORD)wch];
-  int32_t iBidiCls = (dwProps & FX_BIDICLASSBITSMASK) >> FX_BIDICLASSBITS;
-  return (FX_BIDICLASS_R == iBidiCls || FX_BIDICLASS_AL == iBidiCls);
-}
+
 FX_WCHAR FX_GetMirrorChar(FX_WCHAR wch, FX_BOOL bRTL, FX_BOOL bVertical) {
-  FX_DWORD dwProps = kTextLayoutCodeProperties[(FX_WORD)wch];
+  FX_DWORD dwProps = FX_GetUnicodeProperties(wch);
   FX_DWORD dwTemp = (dwProps & 0xFF800000);
   if (bRTL && dwTemp < 0xFF800000) {
-    wch = kFXTextLayoutBidiMirror[dwTemp >> 23];
-    dwProps = kTextLayoutCodeProperties[(FX_WORD)wch];
+    size_t idx = dwTemp >> 23;
+    if (idx < kFXTextLayoutBidiMirrorSize) {
+      wch = kFXTextLayoutBidiMirror[idx];
+      dwProps = FX_GetUnicodeProperties(wch);
+    }
   }
   if (bVertical) {
     dwTemp = (dwProps & 0x007E0000);
     if (dwTemp < 0x007E0000) {
-      wch = kFXTextLayoutVerticalMirror[dwTemp >> 17];
+      size_t idx = dwTemp >> 17;
+      if (idx < kFXTextLayoutVerticalMirrorSize)
+        wch = kFXTextLayoutVerticalMirror[idx];
     }
   }
   return wch;
 }
+
 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) {
-    wch = kFXTextLayoutBidiMirror[dwTemp >> 23];
-    dwProps = kTextLayoutCodeProperties[(FX_WORD)wch];
+    size_t idx = dwTemp >> 23;
+    if (idx < kFXTextLayoutBidiMirrorSize) {
+      wch = kFXTextLayoutBidiMirror[idx];
+      dwProps = FX_GetUnicodeProperties(wch);
+    }
   }
   if (bVertical) {
     dwTemp = (dwProps & 0x007E0000);
     if (dwTemp < 0x007E0000) {
-      wch = kFXTextLayoutVerticalMirror[dwTemp >> 17];
+      size_t idx = dwTemp >> 17;
+      if (idx < kFXTextLayoutVerticalMirrorSize)
+        wch = kFXTextLayoutVerticalMirror[idx];
     }
   }
   return wch;
 }