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// Locale support (codecvt) -*- C++ -*-

// Copyright (C) 2000-2015 Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library is free

// software; you can redistribute it and/or modify it under the

// terms of the GNU General Public License as published by the

// Free Software Foundation; either version 3, 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 General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional

// permissions described in the GCC Runtime Library Exception, version

// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and

// a copy of the GCC Runtime Library Exception along with this program;

// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

// .

//

// ISO C++ 14882: 22.2.1.5 Template class codecvt

//

// Written by Benjamin Kosnik 

/** @file ext/codecvt_specializations.h

 *  This file is a GNU extension to the Standard C++ Library.

 */

#ifndef _EXT_CODECVT_SPECIALIZATIONS_H

#define _EXT_CODECVT_SPECIALIZATIONS_H 1

#include 

#include 

#include 

namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)

{

_GLIBCXX_BEGIN_NAMESPACE_CXX11

_GLIBCXX_BEGIN_NAMESPACE_VERSION

  /// Extension to use iconv for dealing with character encodings.

  // This includes conversions and comparisons between various character

  // sets.  This object encapsulates data that may need to be shared between

  // char_traits, codecvt and ctype.

  class encoding_state

  {

  public:

    // Types:

    // NB: A conversion descriptor subsumes and enhances the

    // functionality of a simple state type such as mbstate_t.

    typedef iconv_t	descriptor_type;

  protected:

    // Name of internal character set encoding.

    std::string	       	_M_int_enc;

    // Name of external character set encoding.

    std::string  	_M_ext_enc;

    // Conversion descriptor between external encoding to internal encoding.

    descriptor_type	_M_in_desc;

    // Conversion descriptor between internal encoding to external encoding.

    descriptor_type	_M_out_desc;

    // The byte-order marker for the external encoding, if necessary.

    int			_M_ext_bom;

    // The byte-order marker for the internal encoding, if necessary.

    int			_M_int_bom;

    // Number of external bytes needed to construct one complete

    // character in the internal encoding.

    // NB: -1 indicates variable, or stateful, encodings.

    int 		_M_bytes;

  public:

    explicit

    encoding_state()

    : _M_in_desc(0), _M_out_desc(0), _M_ext_bom(0), _M_int_bom(0), _M_bytes(0)

    { }

    explicit

    encoding_state(const char* __int, const char* __ext,

		   int __ibom = 0, int __ebom = 0, int __bytes = 1)

    : _M_int_enc(__int), _M_ext_enc(__ext), _M_in_desc(0), _M_out_desc(0),

      _M_ext_bom(__ebom), _M_int_bom(__ibom), _M_bytes(__bytes)

    { init(); }

    // 21.1.2 traits typedefs

    // p4

    // typedef STATE_T state_type

    // requires: state_type shall meet the requirements of

    // CopyConstructible types (20.1.3)

    // NB: This does not preserve the actual state of the conversion

    // descriptor member, but it does duplicate the encoding

    // information.

    encoding_state(const encoding_state& __obj) : _M_in_desc(0), _M_out_desc(0)

    { construct(__obj); }

    // Need assignment operator as well.

    encoding_state&

    operator=(const encoding_state& __obj)

    {

      construct(__obj);

      return *this;

    }

    ~encoding_state()

    { destroy(); }

    bool

    good() const throw()

    {

      const descriptor_type __err = (iconv_t)(-1);

      bool __test = _M_in_desc && _M_in_desc != __err;

      __test &=  _M_out_desc && _M_out_desc != __err;

      return __test;

    }

    int

    character_ratio() const

    { return _M_bytes; }

    const std::string

    internal_encoding() const

    { return _M_int_enc; }

    int

    internal_bom() const

    { return _M_int_bom; }

    const std::string

    external_encoding() const

    { return _M_ext_enc; }

    int

    external_bom() const

    { return _M_ext_bom; }

    const descriptor_type&

    in_descriptor() const

    { return _M_in_desc; }

    const descriptor_type&

    out_descriptor() const

    { return _M_out_desc; }

  protected:

    void

    init()

    {

      const descriptor_type __err = (iconv_t)(-1);

      const bool __have_encodings = _M_int_enc.size() && _M_ext_enc.size();

      if (!_M_in_desc && __have_encodings)

	{

	  _M_in_desc = iconv_open(_M_int_enc.c_str(), _M_ext_enc.c_str());

	  if (_M_in_desc == __err)

	    std::__throw_runtime_error(__N("encoding_state::_M_init "

				    "creating iconv input descriptor failed"));

	}

      if (!_M_out_desc && __have_encodings)

	{

	  _M_out_desc = iconv_open(_M_ext_enc.c_str(), _M_int_enc.c_str());

	  if (_M_out_desc == __err)

	    std::__throw_runtime_error(__N("encoding_state::_M_init "

				  "creating iconv output descriptor failed"));

	}

    }

    void

    construct(const encoding_state& __obj)

    {

      destroy();

      _M_int_enc = __obj._M_int_enc;

      _M_ext_enc = __obj._M_ext_enc;

      _M_ext_bom = __obj._M_ext_bom;

      _M_int_bom = __obj._M_int_bom;

      _M_bytes = __obj._M_bytes;

      init();

    }

    void

    destroy() throw()

    {

      const descriptor_type __err = (iconv_t)(-1);

      if (_M_in_desc && _M_in_desc != __err)

	{

	  iconv_close(_M_in_desc);

	  _M_in_desc = 0;

	}

      if (_M_out_desc && _M_out_desc != __err)

	{

	  iconv_close(_M_out_desc);

	  _M_out_desc = 0;

	}

    }

  };

  /// encoding_char_traits

  // Custom traits type with encoding_state for the state type, and the

  // associated fpos for the position type, all other

  // bits equivalent to the required char_traits instantiations.

  template

    struct encoding_char_traits

    : public std::char_traits<_CharT>

    {

      typedef encoding_state				state_type;

      typedef typename std::fpos		pos_type;

    };

_GLIBCXX_END_NAMESPACE_VERSION

_GLIBCXX_END_NAMESPACE_CXX11

} // namespace

namespace std _GLIBCXX_VISIBILITY(default)

{

_GLIBCXX_BEGIN_NAMESPACE_VERSION

  using __gnu_cxx::encoding_state;

  /// codecvt specialization.

  // This partial specialization takes advantage of iconv to provide

  // code conversions between a large number of character encodings.

  template

    class codecvt<_InternT, _ExternT, encoding_state>

    : public __codecvt_abstract_base<_InternT, _ExternT, encoding_state>

    {

    public:

      // Types:

      typedef codecvt_base::result			result;

      typedef _InternT 					intern_type;

      typedef _ExternT 					extern_type;

      typedef __gnu_cxx::encoding_state 		state_type;

      typedef state_type::descriptor_type 		descriptor_type;

      // Data Members:

      static locale::id 		id;

      explicit

      codecvt(size_t __refs = 0)

      : __codecvt_abstract_base(__refs)

      { }

      explicit

      codecvt(state_type& __enc, size_t __refs = 0)

      : __codecvt_abstract_base(__refs)

      { }

     protected:

      virtual

      ~codecvt() { }

      virtual result

      do_out(state_type& __state, const intern_type* __from,

	     const intern_type* __from_end, const intern_type*& __from_next,

	     extern_type* __to, extern_type* __to_end,

	     extern_type*& __to_next) const;

      virtual result

      do_unshift(state_type& __state, extern_type* __to,

		 extern_type* __to_end, extern_type*& __to_next) const;

      virtual result

      do_in(state_type& __state, const extern_type* __from,

	    const extern_type* __from_end, const extern_type*& __from_next,

	    intern_type* __to, intern_type* __to_end,

	    intern_type*& __to_next) const;

      virtual int

      do_encoding() const throw();

      virtual bool

      do_always_noconv() const throw();

      virtual int

      do_length(state_type&, const extern_type* __from,

		const extern_type* __end, size_t __max) const;

      virtual int

      do_max_length() const throw();

    };

  template

    locale::id

    codecvt<_InternT, _ExternT, encoding_state>::id;

  // This adaptor works around the signature problems of the second

  // argument to iconv():  SUSv2 and others use 'const char**', but glibc 2.2

  // uses 'char**', which matches the POSIX 1003.1-2001 standard.

  // Using this adaptor, g++ will do the work for us.

  template

    inline size_t

    __iconv_adaptor(size_t(*__func)(iconv_t, _Tp, size_t*, char**, size_t*),

                    iconv_t __cd, char** __inbuf, size_t* __inbytes,

                    char** __outbuf, size_t* __outbytes)

    { return __func(__cd, (_Tp)__inbuf, __inbytes, __outbuf, __outbytes); }

  template

    codecvt_base::result

    codecvt<_InternT, _ExternT, encoding_state>::

    do_out(state_type& __state, const intern_type* __from,

	   const intern_type* __from_end, const intern_type*& __from_next,

	   extern_type* __to, extern_type* __to_end,

	   extern_type*& __to_next) const

    {

      result __ret = codecvt_base::error;

      if (__state.good())

	{

	  const descriptor_type& __desc = __state.out_descriptor();

	  const size_t __fmultiple = sizeof(intern_type);

	  size_t __fbytes = __fmultiple * (__from_end - __from);

	  const size_t __tmultiple = sizeof(extern_type);

	  size_t __tbytes = __tmultiple * (__to_end - __to);

	  // Argument list for iconv specifies a byte sequence. Thus,

	  // all to/from arrays must be brutally casted to char*.

	  char* __cto = reinterpret_cast(__to);

	  char* __cfrom;

	  size_t __conv;

	  // Some encodings need a byte order marker as the first item

	  // in the byte stream, to designate endian-ness. The default

	  // value for the byte order marker is NULL, so if this is

	  // the case, it's not necessary and we can just go on our

	  // merry way.

	  int __int_bom = __state.internal_bom();

	  if (__int_bom)

	    {

	      size_t __size = __from_end - __from;

	      intern_type* __cfixed = static_cast

		(__builtin_alloca(sizeof(intern_type) * (__size + 1)));

	      __cfixed[0] = static_cast(__int_bom);

	      char_traits::copy(__cfixed + 1, __from, __size);

	      __cfrom = reinterpret_cast(__cfixed);

	      __conv = __iconv_adaptor(iconv, __desc, &__cfrom,

                                        &__fbytes, &__cto, &__tbytes);

	    }

	  else

	    {

	      intern_type* __cfixed = const_cast(__from);

	      __cfrom = reinterpret_cast(__cfixed);

	      __conv = __iconv_adaptor(iconv, __desc, &__cfrom, &__fbytes,

				       &__cto, &__tbytes);

	    }

	  if (__conv != size_t(-1))

	    {

	      __from_next = reinterpret_cast(__cfrom);

	      __to_next = reinterpret_cast(__cto);

	      __ret = codecvt_base::ok;

	    }

	  else

	    {

	      if (__fbytes < __fmultiple * (__from_end - __from))

		{

		  __from_next = reinterpret_cast(__cfrom);

		  __to_next = reinterpret_cast(__cto);

		  __ret = codecvt_base::partial;

		}

	      else

		__ret = codecvt_base::error;

	    }

	}

      return __ret;

    }

  template

    codecvt_base::result

    codecvt<_InternT, _ExternT, encoding_state>::

    do_unshift(state_type& __state, extern_type* __to,

	       extern_type* __to_end, extern_type*& __to_next) const

    {

      result __ret = codecvt_base::error;

      if (__state.good())

	{

	  const descriptor_type& __desc = __state.in_descriptor();

	  const size_t __tmultiple = sizeof(intern_type);

	  size_t __tlen = __tmultiple * (__to_end - __to);

	  // Argument list for iconv specifies a byte sequence. Thus,

	  // all to/from arrays must be brutally casted to char*.

	  char* __cto = reinterpret_cast(__to);

	  size_t __conv = __iconv_adaptor(iconv,__desc, 0, 0,

                                          &__cto, &__tlen);

	  if (__conv != size_t(-1))

	    {

	      __to_next = reinterpret_cast(__cto);

	      if (__tlen == __tmultiple * (__to_end - __to))

		__ret = codecvt_base::noconv;

	      else if (__tlen == 0)

		__ret = codecvt_base::ok;

	      else

		__ret = codecvt_base::partial;

	    }

	  else

	    __ret = codecvt_base::error;

	}

      return __ret;

    }

  template

    codecvt_base::result

    codecvt<_InternT, _ExternT, encoding_state>::

    do_in(state_type& __state, const extern_type* __from,

	  const extern_type* __from_end, const extern_type*& __from_next,

	  intern_type* __to, intern_type* __to_end,

	  intern_type*& __to_next) const

    {

      result __ret = codecvt_base::error;

      if (__state.good())

	{

	  const descriptor_type& __desc = __state.in_descriptor();

	  const size_t __fmultiple = sizeof(extern_type);

	  size_t __flen = __fmultiple * (__from_end - __from);

	  const size_t __tmultiple = sizeof(intern_type);

	  size_t __tlen = __tmultiple * (__to_end - __to);

	  // Argument list for iconv specifies a byte sequence. Thus,

	  // all to/from arrays must be brutally casted to char*.

	  char* __cto = reinterpret_cast(__to);

	  char* __cfrom;

	  size_t __conv;

	  // Some encodings need a byte order marker as the first item

	  // in the byte stream, to designate endian-ness. The default

	  // value for the byte order marker is NULL, so if this is

	  // the case, it's not necessary and we can just go on our

	  // merry way.

	  int __ext_bom = __state.external_bom();

	  if (__ext_bom)

	    {

	      size_t __size = __from_end - __from;

	      extern_type* __cfixed =  static_cast

		(__builtin_alloca(sizeof(extern_type) * (__size + 1)));

	      __cfixed[0] = static_cast(__ext_bom);

	      char_traits::copy(__cfixed + 1, __from, __size);

	      __cfrom = reinterpret_cast(__cfixed);

	      __conv = __iconv_adaptor(iconv, __desc, &__cfrom,

                                       &__flen, &__cto, &__tlen);

	    }

	  else

	    {

	      extern_type* __cfixed = const_cast(__from);

	      __cfrom = reinterpret_cast(__cfixed);

	      __conv = __iconv_adaptor(iconv, __desc, &__cfrom,

                                       &__flen, &__cto, &__tlen);

	    }

	  if (__conv != size_t(-1))

	    {

	      __from_next = reinterpret_cast(__cfrom);

	      __to_next = reinterpret_cast(__cto);

	      __ret = codecvt_base::ok;

	    }

	  else

	    {

	      if (__flen < static_cast(__from_end - __from))

		{

		  __from_next = reinterpret_cast(__cfrom);

		  __to_next = reinterpret_cast(__cto);

		  __ret = codecvt_base::partial;

		}

	      else

		__ret = codecvt_base::error;

	    }

	}

      return __ret;

    }

  template

    int

    codecvt<_InternT, _ExternT, encoding_state>::

    do_encoding() const throw()

    {

      int __ret = 0;

      if (sizeof(_ExternT) <= sizeof(_InternT))

	__ret = sizeof(_InternT) / sizeof(_ExternT);

      return __ret;

    }

  template

    bool

    codecvt<_InternT, _ExternT, encoding_state>::

    do_always_noconv() const throw()

    { return false; }

  template

    int

    codecvt<_InternT, _ExternT, encoding_state>::

    do_length(state_type&, const extern_type* __from,

	      const extern_type* __end, size_t __max) const

    { return std::min(__max, static_cast(__end - __from)); }

  // _GLIBCXX_RESOLVE_LIB_DEFECTS

  // 74.  Garbled text for codecvt::do_max_length

  template

    int

    codecvt<_InternT, _ExternT, encoding_state>::

    do_max_length() const throw()

    { return 1; }

_GLIBCXX_END_NAMESPACE_VERSION

} // namespace

#endif