The first step towards supporting the Hungarian spell-checking dictionary....

chrome/tools/convert_dict/hunspell_reader.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/tools/convert_dict/hunspell_reader.h"
 
 #include "base/string_util.h"
 
 namespace convert_dict {
 
 // This silly 64K buffer is just copied from Hunspell's way of parsing.
 const int kLineBufferLen = 65535;
 char line_buffer[kLineBufferLen];
 
 // Shortcut for trimming whitespace from both ends of the line.
 void TrimLine(std::string* line) {
   if (line->size() > 3 &&
       static_cast<unsigned char>((*line)[0]) == 0xef &&
       static_cast<unsigned char>((*line)[1]) == 0xbb &&
       static_cast<unsigned char>((*line)[2]) == 0xbf)
     *line = line->substr(3);
 
-  std::wstring line_input_wide = UTF8ToWide(*line);
-  std::wstring line_output_wide;
-  TrimWhitespace(line_input_wide, TRIM_ALL, &line_output_wide);
-  *line = WideToUTF8(line_output_wide);
+  // Treat this text as an ASCII text and trim whitespace characters as
+  // hunspell does. The returned text is to be converted into UTF-8 text with
+  // the encoding defined in an affix file.
+  TrimWhitespace(*line, TRIM_ALL, line);
 }
 
 std::string ReadLine(FILE* file) {
   const char* line = fgets(line_buffer, kLineBufferLen - 1, file);
   if (!line)
     return std::string();
 
   std::string str = line;
   TrimLine(&str);
   return str;
 }
 
 void StripComment(std::string* line) {
   for (size_t i = 0; i < line->size(); i++) {
     if ((*line)[i] == '#') {
       line->resize(i);
       TrimLine(line);
       return;
     }
   }
 }
 
 }  // namespace convert_dict