core/fpdftext/unicodenormalization.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/fpdftext/unicodenormalization.h"

#include "core/fpdftext/unicodenormalizationdata.h"
#include "core/fxcrt/include/fx_string.h"

namespace {

const uint16_t* const g_UnicodeData_Normalization_Maps[5] = {
    nullptr, g_UnicodeData_Normalization_Map1, g_UnicodeData_Normalization_Map2,
    g_UnicodeData_Normalization_Map3, g_UnicodeData_Normalization_Map4};

}  // namespace

FX_STRSIZE FX_Unicode_GetNormalization(FX_WCHAR wch, FX_WCHAR* pDst) {
  wch = wch & 0xFFFF;
  FX_WCHAR wFind = g_UnicodeData_Normalization[wch];
  if (!wFind) {
    if (pDst) {
      *pDst = wch;
    }
    return 1;
  }
  if (wFind >= 0x8000) {
    wch = wFind - 0x8000;
    wFind = 1;
  } else {
    wch = wFind & 0x0FFF;
    wFind >>= 12;
  }
  const uint16_t* pMap = g_UnicodeData_Normalization_Maps[wFind];
  if (pMap == g_UnicodeData_Normalization_Map4) {
    pMap = g_UnicodeData_Normalization_Map4 + wch;
    wFind = (FX_WCHAR)(*pMap++);
  } else {
    pMap += wch;
  }
  if (pDst) {
    FX_WCHAR n = wFind;
    while (n--) {
      *pDst++ = *pMap++;
    }
  }
  return (FX_STRSIZE)wFind;
}