core/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/fxcrt/fx_unicode.h"

#include "core/fxcrt/fx_ucddata.h"

namespace {

constexpr uint32_t kMirrorBits = 23;
constexpr uint32_t kMirrorMask = 0x1FFU << kMirrorBits;

wchar_t GetMirrorChar(wchar_t wch, uint32_t dwProps) {
  uint32_t dwTemp = (dwProps & kMirrorMask);
  if (dwTemp == kMirrorMask)
    return wch;
  size_t idx = dwTemp >> kMirrorBits;
  return idx < kFXTextLayoutBidiMirrorSize ? kFXTextLayoutBidiMirror[idx] : wch;
}

}  // namespace

uint32_t FX_GetUnicodeProperties(wchar_t wch) {
  size_t idx = static_cast<size_t>(wch);
  if (idx < kTextLayoutCodePropertiesSize)
    return kTextLayoutCodeProperties[idx];
  return 0;
}

wchar_t FX_GetMirrorChar(wchar_t wch) {
  return GetMirrorChar(wch, FX_GetUnicodeProperties(wch));
}

#ifdef PDF_ENABLE_XFA
wchar_t FX_GetMirrorChar(wchar_t wch, uint32_t dwProps) {
  return GetMirrorChar(wch, dwProps);
}
#endif  // PDF_ENABLE_XFA