// 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_string.h"
#include "unicodenormalizationdata.h"

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

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 FX_WCHAR* 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;
}
FX_STRSIZE FX_WideString_GetNormalization(const CFX_WideStringC& wsSrc,
                                          FX_WCHAR* pDst) {
  FX_STRSIZE nCount = 0;
  for (FX_STRSIZE len = 0; len < wsSrc.GetLength(); len++) {
    FX_WCHAR wch = wsSrc.GetAt(len);
    if (pDst) {
      nCount += FX_Unicode_GetNormalization(wch, pDst + nCount);
    } else {
      nCount += FX_Unicode_GetNormalization(wch, pDst);
    }
  }
  return nCount;
}
FX_STRSIZE FX_WideString_GetNormalization(const CFX_WideStringC& wsSrc,
                                          CFX_WideString& wsDst) {
  FX_STRSIZE nLen = FX_WideString_GetNormalization(wsSrc, (FX_WCHAR*)NULL);
  if (!nLen) {
    return 0;
  }
  FX_WCHAR* pBuf = wsDst.GetBuffer(nLen);
  FX_WideString_GetNormalization(wsSrc, pBuf);
  wsDst.ReleaseBuffer(nLen);
  return nLen;
}