516 lines
16 KiB
C++
516 lines
16 KiB
C++
// Locale support (codecvt) -*- C++ -*-
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// Copyright (C) 2000-2017 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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//
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// ISO C++ 14882: 22.2.1.5 Template class codecvt
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//
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// Written by Benjamin Kosnik <bkoz@redhat.com>
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/** @file ext/codecvt_specializations.h
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* This file is a GNU extension to the Standard C++ Library.
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*/
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#ifndef _EXT_CODECVT_SPECIALIZATIONS_H
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#define _EXT_CODECVT_SPECIALIZATIONS_H 1
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#include <bits/c++config.h>
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#include <locale>
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#include <iconv.h>
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namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_CXX11
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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/// Extension to use iconv for dealing with character encodings.
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// This includes conversions and comparisons between various character
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// sets. This object encapsulates data that may need to be shared between
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// char_traits, codecvt and ctype.
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class encoding_state
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{
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public:
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// Types:
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// NB: A conversion descriptor subsumes and enhances the
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// functionality of a simple state type such as mbstate_t.
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typedef iconv_t descriptor_type;
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protected:
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// Name of internal character set encoding.
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std::string _M_int_enc;
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// Name of external character set encoding.
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std::string _M_ext_enc;
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// Conversion descriptor between external encoding to internal encoding.
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descriptor_type _M_in_desc;
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// Conversion descriptor between internal encoding to external encoding.
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descriptor_type _M_out_desc;
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// The byte-order marker for the external encoding, if necessary.
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int _M_ext_bom;
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// The byte-order marker for the internal encoding, if necessary.
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int _M_int_bom;
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// Number of external bytes needed to construct one complete
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// character in the internal encoding.
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// NB: -1 indicates variable, or stateful, encodings.
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int _M_bytes;
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public:
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explicit
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encoding_state()
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: _M_in_desc(0), _M_out_desc(0), _M_ext_bom(0), _M_int_bom(0), _M_bytes(0)
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{ }
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explicit
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encoding_state(const char* __int, const char* __ext,
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int __ibom = 0, int __ebom = 0, int __bytes = 1)
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: _M_int_enc(__int), _M_ext_enc(__ext), _M_in_desc(0), _M_out_desc(0),
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_M_ext_bom(__ebom), _M_int_bom(__ibom), _M_bytes(__bytes)
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{ init(); }
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// 21.1.2 traits typedefs
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// p4
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// typedef STATE_T state_type
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// requires: state_type shall meet the requirements of
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// CopyConstructible types (20.1.3)
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// NB: This does not preserve the actual state of the conversion
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// descriptor member, but it does duplicate the encoding
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// information.
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encoding_state(const encoding_state& __obj) : _M_in_desc(0), _M_out_desc(0)
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{ construct(__obj); }
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// Need assignment operator as well.
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encoding_state&
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operator=(const encoding_state& __obj)
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{
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construct(__obj);
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return *this;
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}
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~encoding_state()
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{ destroy(); }
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bool
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good() const throw()
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{
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const descriptor_type __err = (iconv_t)(-1);
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bool __test = _M_in_desc && _M_in_desc != __err;
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__test &= _M_out_desc && _M_out_desc != __err;
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return __test;
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}
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int
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character_ratio() const
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{ return _M_bytes; }
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const std::string
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internal_encoding() const
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{ return _M_int_enc; }
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int
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internal_bom() const
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{ return _M_int_bom; }
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const std::string
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external_encoding() const
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{ return _M_ext_enc; }
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int
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external_bom() const
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{ return _M_ext_bom; }
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const descriptor_type&
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in_descriptor() const
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{ return _M_in_desc; }
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const descriptor_type&
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out_descriptor() const
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{ return _M_out_desc; }
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protected:
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void
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init()
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{
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const descriptor_type __err = (iconv_t)(-1);
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const bool __have_encodings = _M_int_enc.size() && _M_ext_enc.size();
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if (!_M_in_desc && __have_encodings)
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{
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_M_in_desc = iconv_open(_M_int_enc.c_str(), _M_ext_enc.c_str());
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if (_M_in_desc == __err)
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std::__throw_runtime_error(__N("encoding_state::_M_init "
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"creating iconv input descriptor failed"));
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}
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if (!_M_out_desc && __have_encodings)
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{
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_M_out_desc = iconv_open(_M_ext_enc.c_str(), _M_int_enc.c_str());
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if (_M_out_desc == __err)
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std::__throw_runtime_error(__N("encoding_state::_M_init "
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"creating iconv output descriptor failed"));
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}
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}
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void
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construct(const encoding_state& __obj)
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{
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destroy();
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_M_int_enc = __obj._M_int_enc;
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_M_ext_enc = __obj._M_ext_enc;
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_M_ext_bom = __obj._M_ext_bom;
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_M_int_bom = __obj._M_int_bom;
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_M_bytes = __obj._M_bytes;
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init();
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}
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void
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destroy() throw()
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{
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const descriptor_type __err = (iconv_t)(-1);
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if (_M_in_desc && _M_in_desc != __err)
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{
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iconv_close(_M_in_desc);
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_M_in_desc = 0;
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}
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if (_M_out_desc && _M_out_desc != __err)
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{
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iconv_close(_M_out_desc);
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_M_out_desc = 0;
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}
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}
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};
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/// encoding_char_traits
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// Custom traits type with encoding_state for the state type, and the
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// associated fpos<encoding_state> for the position type, all other
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// bits equivalent to the required char_traits instantiations.
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template<typename _CharT>
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struct encoding_char_traits
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: public std::char_traits<_CharT>
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{
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typedef encoding_state state_type;
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typedef typename std::fpos<state_type> pos_type;
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};
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_GLIBCXX_END_NAMESPACE_VERSION
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_GLIBCXX_END_NAMESPACE_CXX11
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} // namespace
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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using __gnu_cxx::encoding_state;
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/// codecvt<InternT, _ExternT, encoding_state> specialization.
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// This partial specialization takes advantage of iconv to provide
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// code conversions between a large number of character encodings.
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template<typename _InternT, typename _ExternT>
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class codecvt<_InternT, _ExternT, encoding_state>
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: public __codecvt_abstract_base<_InternT, _ExternT, encoding_state>
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{
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public:
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// Types:
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typedef codecvt_base::result result;
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typedef _InternT intern_type;
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typedef _ExternT extern_type;
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typedef __gnu_cxx::encoding_state state_type;
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typedef state_type::descriptor_type descriptor_type;
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// Data Members:
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static locale::id id;
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explicit
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codecvt(size_t __refs = 0)
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: __codecvt_abstract_base<intern_type, extern_type, state_type>(__refs)
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{ }
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explicit
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codecvt(state_type& __enc, size_t __refs = 0)
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: __codecvt_abstract_base<intern_type, extern_type, state_type>(__refs)
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{ }
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protected:
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virtual
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~codecvt() { }
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virtual result
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do_out(state_type& __state, const intern_type* __from,
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const intern_type* __from_end, const intern_type*& __from_next,
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extern_type* __to, extern_type* __to_end,
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extern_type*& __to_next) const;
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virtual result
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do_unshift(state_type& __state, extern_type* __to,
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extern_type* __to_end, extern_type*& __to_next) const;
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virtual result
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do_in(state_type& __state, const extern_type* __from,
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const extern_type* __from_end, const extern_type*& __from_next,
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intern_type* __to, intern_type* __to_end,
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intern_type*& __to_next) const;
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virtual int
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do_encoding() const throw();
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virtual bool
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do_always_noconv() const throw();
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virtual int
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do_length(state_type&, const extern_type* __from,
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const extern_type* __end, size_t __max) const;
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virtual int
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do_max_length() const throw();
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};
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template<typename _InternT, typename _ExternT>
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locale::id
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codecvt<_InternT, _ExternT, encoding_state>::id;
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// This adaptor works around the signature problems of the second
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// argument to iconv(): SUSv2 and others use 'const char**', but glibc 2.2
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// uses 'char**', which matches the POSIX 1003.1-2001 standard.
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// Using this adaptor, g++ will do the work for us.
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template<typename _Tp>
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inline size_t
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__iconv_adaptor(size_t(*__func)(iconv_t, _Tp, size_t*, char**, size_t*),
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iconv_t __cd, char** __inbuf, size_t* __inbytes,
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char** __outbuf, size_t* __outbytes)
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{ return __func(__cd, (_Tp)__inbuf, __inbytes, __outbuf, __outbytes); }
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template<typename _InternT, typename _ExternT>
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codecvt_base::result
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codecvt<_InternT, _ExternT, encoding_state>::
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do_out(state_type& __state, const intern_type* __from,
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const intern_type* __from_end, const intern_type*& __from_next,
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extern_type* __to, extern_type* __to_end,
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extern_type*& __to_next) const
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{
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result __ret = codecvt_base::error;
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if (__state.good())
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{
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const descriptor_type& __desc = __state.out_descriptor();
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const size_t __fmultiple = sizeof(intern_type);
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size_t __fbytes = __fmultiple * (__from_end - __from);
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const size_t __tmultiple = sizeof(extern_type);
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size_t __tbytes = __tmultiple * (__to_end - __to);
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// Argument list for iconv specifies a byte sequence. Thus,
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// all to/from arrays must be brutally casted to char*.
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char* __cto = reinterpret_cast<char*>(__to);
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char* __cfrom;
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size_t __conv;
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// Some encodings need a byte order marker as the first item
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// in the byte stream, to designate endian-ness. The default
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// value for the byte order marker is NULL, so if this is
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// the case, it's not necessary and we can just go on our
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// merry way.
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int __int_bom = __state.internal_bom();
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if (__int_bom)
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{
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size_t __size = __from_end - __from;
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intern_type* __cfixed = static_cast<intern_type*>
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(__builtin_alloca(sizeof(intern_type) * (__size + 1)));
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__cfixed[0] = static_cast<intern_type>(__int_bom);
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char_traits<intern_type>::copy(__cfixed + 1, __from, __size);
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__cfrom = reinterpret_cast<char*>(__cfixed);
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__conv = __iconv_adaptor(iconv, __desc, &__cfrom,
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&__fbytes, &__cto, &__tbytes);
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}
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else
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{
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intern_type* __cfixed = const_cast<intern_type*>(__from);
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__cfrom = reinterpret_cast<char*>(__cfixed);
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__conv = __iconv_adaptor(iconv, __desc, &__cfrom, &__fbytes,
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&__cto, &__tbytes);
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}
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if (__conv != size_t(-1))
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{
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__from_next = reinterpret_cast<const intern_type*>(__cfrom);
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__to_next = reinterpret_cast<extern_type*>(__cto);
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__ret = codecvt_base::ok;
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}
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else
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{
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if (__fbytes < __fmultiple * (__from_end - __from))
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{
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__from_next = reinterpret_cast<const intern_type*>(__cfrom);
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__to_next = reinterpret_cast<extern_type*>(__cto);
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__ret = codecvt_base::partial;
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}
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else
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__ret = codecvt_base::error;
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}
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}
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return __ret;
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}
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template<typename _InternT, typename _ExternT>
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codecvt_base::result
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codecvt<_InternT, _ExternT, encoding_state>::
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do_unshift(state_type& __state, extern_type* __to,
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extern_type* __to_end, extern_type*& __to_next) const
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{
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result __ret = codecvt_base::error;
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if (__state.good())
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{
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const descriptor_type& __desc = __state.in_descriptor();
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const size_t __tmultiple = sizeof(intern_type);
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size_t __tlen = __tmultiple * (__to_end - __to);
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// Argument list for iconv specifies a byte sequence. Thus,
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// all to/from arrays must be brutally casted to char*.
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char* __cto = reinterpret_cast<char*>(__to);
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size_t __conv = __iconv_adaptor(iconv,__desc, 0, 0,
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&__cto, &__tlen);
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if (__conv != size_t(-1))
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{
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__to_next = reinterpret_cast<extern_type*>(__cto);
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if (__tlen == __tmultiple * (__to_end - __to))
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__ret = codecvt_base::noconv;
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else if (__tlen == 0)
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__ret = codecvt_base::ok;
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else
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__ret = codecvt_base::partial;
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}
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else
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__ret = codecvt_base::error;
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}
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return __ret;
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}
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template<typename _InternT, typename _ExternT>
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codecvt_base::result
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codecvt<_InternT, _ExternT, encoding_state>::
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do_in(state_type& __state, const extern_type* __from,
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const extern_type* __from_end, const extern_type*& __from_next,
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intern_type* __to, intern_type* __to_end,
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intern_type*& __to_next) const
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{
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result __ret = codecvt_base::error;
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if (__state.good())
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{
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const descriptor_type& __desc = __state.in_descriptor();
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const size_t __fmultiple = sizeof(extern_type);
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size_t __flen = __fmultiple * (__from_end - __from);
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const size_t __tmultiple = sizeof(intern_type);
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size_t __tlen = __tmultiple * (__to_end - __to);
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// Argument list for iconv specifies a byte sequence. Thus,
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// all to/from arrays must be brutally casted to char*.
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char* __cto = reinterpret_cast<char*>(__to);
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char* __cfrom;
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size_t __conv;
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// Some encodings need a byte order marker as the first item
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// in the byte stream, to designate endian-ness. The default
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// value for the byte order marker is NULL, so if this is
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// the case, it's not necessary and we can just go on our
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// merry way.
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int __ext_bom = __state.external_bom();
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if (__ext_bom)
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{
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size_t __size = __from_end - __from;
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extern_type* __cfixed = static_cast<extern_type*>
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(__builtin_alloca(sizeof(extern_type) * (__size + 1)));
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__cfixed[0] = static_cast<extern_type>(__ext_bom);
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char_traits<extern_type>::copy(__cfixed + 1, __from, __size);
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__cfrom = reinterpret_cast<char*>(__cfixed);
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__conv = __iconv_adaptor(iconv, __desc, &__cfrom,
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&__flen, &__cto, &__tlen);
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}
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else
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{
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extern_type* __cfixed = const_cast<extern_type*>(__from);
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__cfrom = reinterpret_cast<char*>(__cfixed);
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__conv = __iconv_adaptor(iconv, __desc, &__cfrom,
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&__flen, &__cto, &__tlen);
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}
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if (__conv != size_t(-1))
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{
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__from_next = reinterpret_cast<const extern_type*>(__cfrom);
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__to_next = reinterpret_cast<intern_type*>(__cto);
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__ret = codecvt_base::ok;
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}
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else
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{
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if (__flen < static_cast<size_t>(__from_end - __from))
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{
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__from_next = reinterpret_cast<const extern_type*>(__cfrom);
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__to_next = reinterpret_cast<intern_type*>(__cto);
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__ret = codecvt_base::partial;
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}
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else
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__ret = codecvt_base::error;
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}
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}
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return __ret;
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}
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template<typename _InternT, typename _ExternT>
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int
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codecvt<_InternT, _ExternT, encoding_state>::
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do_encoding() const throw()
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{
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int __ret = 0;
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if (sizeof(_ExternT) <= sizeof(_InternT))
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__ret = sizeof(_InternT) / sizeof(_ExternT);
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return __ret;
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}
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template<typename _InternT, typename _ExternT>
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bool
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codecvt<_InternT, _ExternT, encoding_state>::
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do_always_noconv() const throw()
|
|
{ return false; }
|
|
|
|
template<typename _InternT, typename _ExternT>
|
|
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<size_t>(__end - __from)); }
|
|
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
// 74. Garbled text for codecvt::do_max_length
|
|
template<typename _InternT, typename _ExternT>
|
|
int
|
|
codecvt<_InternT, _ExternT, encoding_state>::
|
|
do_max_length() const throw()
|
|
{ return 1; }
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace
|
|
|
|
#endif
|