UTF8Decoder.h++

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/* ---------------------------------------------------------------------------
   commonc++ - A C++ Common Class Library
   Copyright (C) 2005-2012  Mark A Lindner

   This file is part of commonc++.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   ---------------------------------------------------------------------------
*/

#ifndef __ccxx_UTF8Decoder_hxx
#define __ccxx_UTF8Decoder_hxx

#include <commonc++/Common.h++>

namespace ccxx {

class COMMONCPP_API UTF8Decoder
{
  public:

  UTF8Decoder(const char *str, size_t offset = 0, size_t length = 0) throw();

  ~UTF8Decoder() throw();

  size_t decode(char16_t *buf, size_t length) throw();

  size_t decodedLength() const throw();

  private:

  // Outputs the next unicode character as a single UTF-16 char or surrogate
  // pair. Returns false if there's not enough room in the output buffer.
  bool outputChar(char16_t **buf, size_t *len, uint32_t uchar) throw();

  const char *_str;
  size_t _offset;
  size_t _length;
  const char *_inp;
  size_t _left;
  char16_t _extra;
  int _needed;

  CCXX_COPY_DECLS(UTF8Decoder);
};

} // namespace ccxx

#endif // __ccxx_UTF8Decoder_hxx