Make code compile with clang_use_chrome_plugin (part I)

core/fpdfapi/fpdf_font/fpdf_font.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/fpdfapi/fpdf_font/font_int.h"
 
 #include "core/fpdfapi/fpdf_page/cpdf_pagemodule.h"
 #include "core/fpdfapi/fpdf_page/include/cpdf_form.h"
@@ skipping 75 matching lines @@
 
 
 
 short TT2PDF(int m, FXFT_Face face) {
   int upm = FXFT_Get_Face_UnitsPerEM(face);
   if (upm == 0)
     return (short)m;
   return (m * 1000 + upm / 2) / upm;
 }
 
-CFX_WideString CPDF_ToUnicodeMap::Lookup(uint32_t charcode) {
+CFX_WideString CPDF_ToUnicodeMap::Lookup(uint32_t charcode) const {
   auto it = m_Map.find(charcode);
   if (it != m_Map.end()) {
     uint32_t value = it->second;
     FX_WCHAR unicode = (FX_WCHAR)(value & 0xffff);
     if (unicode != 0xffff) {
       return unicode;
     }
     const FX_WCHAR* buf = m_MultiCharBuf.GetBuffer();
     uint32_t buf_len = m_MultiCharBuf.GetLength();
     if (!buf || buf_len == 0) {
       return CFX_WideString();
     }
     uint32_t index = value >> 16;
     if (index >= buf_len) {
       return CFX_WideString();
     }
     uint32_t len = buf[index];
     if (index + len < index || index + len >= buf_len) {
       return CFX_WideString();
     }
     return CFX_WideString(buf + index + 1, len);
   }
   if (m_pBaseMap) {
     return m_pBaseMap->UnicodeFromCID((uint16_t)charcode);
   }
   return CFX_WideString();
 }
 
-uint32_t CPDF_ToUnicodeMap::ReverseLookup(FX_WCHAR unicode) {
+uint32_t CPDF_ToUnicodeMap::ReverseLookup(FX_WCHAR unicode) const {
   for (const auto& pair : m_Map) {
     if (pair.second == static_cast<uint32_t>(unicode))
       return pair.first;
   }
   return 0;
 }
 
 // Static.
 uint32_t CPDF_ToUnicodeMap::StringToCode(const CFX_ByteStringC& str) {
   int len = str.GetLength();
@@ skipping 50 matching lines @@
         result += ch;
         byte_pos = 0;
         ch = 0;
       }
     }
     return result;
   }
   return result;
 }
 
+CPDF_ToUnicodeMap::CPDF_ToUnicodeMap() : m_pBaseMap(nullptr) {}
+
+CPDF_ToUnicodeMap::~CPDF_ToUnicodeMap() {}
+
 void CPDF_ToUnicodeMap::Load(CPDF_Stream* pStream) {
   CIDSet cid_set = CIDSET_UNKNOWN;
   CPDF_StreamAcc stream;
   stream.LoadAllData(pStream, FALSE);
   CPDF_SimpleParser parser(stream.GetData(), stream.GetSize());
   while (1) {
     CFX_ByteStringC word = parser.GetWord();
     if (word.IsEmpty()) {
       break;
     }
@@ skipping 87 matching lines @@
   }
   if (cid_set) {
     m_pBaseMap = CPDF_ModuleMgr::Get()
                      ->GetPageModule()
                      ->GetFontGlobals()
                      ->m_CMapManager.GetCID2UnicodeMap(cid_set, FALSE);
   } else {
     m_pBaseMap = nullptr;
   }
 }