forked from KolibriOS/kolibrios
718 lines
22 KiB
C++
718 lines
22 KiB
C++
// Locale support (codecvt) -*- C++ -*-
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// Copyright (C) 2000, 2001 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 2, 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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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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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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// Warning: this file is not meant for user inclusion. Use <locale>.
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// Written by Benjamin Kosnik <bkoz@cygnus.com>
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#ifndef _CPP_BITS_CODECVT_H
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#define _CPP_BITS_CODECVT_H 1
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#pragma GCC system_header
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// XXX
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// __enc_traits may need to move up the locale header hierarchy,
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// depending on if ctype ends up using it.
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#ifdef _GLIBCPP_USE_WCHAR_T
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// Extensions to use icov for dealing with character encodings,
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// including 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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#if _GLIBCPP_USE_SHADOW_HEADERS
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using _C_legacy::CODESET;
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#endif
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class __enc_traits
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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 __desc_type;
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protected:
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// Data Members:
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// Max size of charset encoding name
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static const int _S_max_size = 32;
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// Name of internal character set encoding.
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char _M_int_enc[_S_max_size];
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// Name of external character set encoding.
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char _M_ext_enc[_S_max_size];
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// Conversion descriptor between external encoding to internal encoding.
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__desc_type _M_in_desc;
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// Conversion descriptor between internal encoding to external encoding.
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__desc_type _M_out_desc;
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// Details the byte-order marker for the external encoding, if necessary.
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int _M_ext_bom;
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// Details the byte-order marker for the internal encoding, if necessary.
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int _M_int_bom;
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public:
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__enc_traits()
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: _M_in_desc(0), _M_out_desc(0), _M_ext_bom(0), _M_int_bom(0)
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{
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// __intc_end = whatever we are using internally, which is
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// UCS4 (linux)
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// UCS2 == UNICODE (microsoft, java, aix, whatever...)
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// XXX Currently don't know how to get this data from target system...
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strcpy(_M_int_enc, "UCS4");
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// __extc_end = external codeset in current locale
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strcpy(_M_ext_enc, nl_langinfo(CODESET));
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}
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__enc_traits(const char* __int, const char* __ext, int __ibom = 0,
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int __ebom = 0)
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: _M_in_desc(0), _M_out_desc(0), _M_ext_bom(0), _M_int_bom(0)
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{
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strncpy(_M_int_enc, __int, _S_max_size);
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strncpy(_M_ext_enc, __ext, _S_max_size);
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}
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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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__enc_traits(const __enc_traits& __obj)
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{
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strncpy(_M_int_enc, __obj._M_int_enc, _S_max_size);
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strncpy(_M_ext_enc, __obj._M_ext_enc, _S_max_size);
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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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}
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~__enc_traits()
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{
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iconv_close(_M_in_desc);
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iconv_close(_M_out_desc);
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}
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// Initializes
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void
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_M_init()
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{
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_M_in_desc = iconv_open(_M_int_enc, _M_ext_enc);
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_M_out_desc = iconv_open(_M_ext_enc, _M_int_enc);
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if (_M_out_desc == iconv_t(-1) || _M_in_desc == iconv_t(-1))
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{
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// XXX Extended error checking.
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}
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}
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bool
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_M_good()
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{
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return _M_out_desc && _M_in_desc
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&& _M_out_desc != iconv_t(-1) && _M_in_desc != iconv_t(-1);
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}
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const __desc_type*
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_M_get_in_descriptor()
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{ return &_M_in_desc; }
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const __desc_type*
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_M_get_out_descriptor()
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{ return &_M_out_desc; }
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const char*
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_M_get_internal_enc()
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{ return _M_int_enc; }
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const char*
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_M_get_external_enc()
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{ return _M_ext_enc; }
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int
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_M_get_external_bom()
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{ return _M_ext_bom; }
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int
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_M_get_internal_bom()
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{ return _M_int_bom; }
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};
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#endif //_GLIBCPP_USE_WCHAR_T
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// 22.2.1.5 Template class codecvt
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class codecvt_base
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{
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public:
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enum result
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{
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ok,
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partial,
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error,
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noconv
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};
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};
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// Template class __codecvt_abstract_base
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// NB: An abstract base class that fills in the public inlines, so
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// that the specializations don't have to re-copy the public
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// interface.
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template<typename _InternT, typename _ExternT, typename _StateT>
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class __codecvt_abstract_base
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: public locale::facet, public codecvt_base
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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 _StateT state_type;
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// 22.2.1.5.1 codecvt members
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result
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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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return this->do_out(__state, __from, __from_end, __from_next,
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__to, __to_end, __to_next);
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}
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result
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unshift(state_type& __state, extern_type* __to, extern_type* __to_end,
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extern_type*& __to_next) const
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{ return this->do_unshift(__state, __to,__to_end,__to_next); }
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result
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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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return this->do_in(__state, __from, __from_end, __from_next,
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__to, __to_end, __to_next);
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}
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int
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encoding() const throw()
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{ return this->do_encoding(); }
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bool
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always_noconv() const throw()
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{ return this->do_always_noconv(); }
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int
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length(const state_type& __state, const extern_type* __from,
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const extern_type* __end, size_t __max) const
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{ return this->do_length(__state, __from, __end, __max); }
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int
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max_length() const throw()
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{ return this->do_max_length(); }
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protected:
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explicit
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__codecvt_abstract_base(size_t __refs = 0) : locale::facet(__refs) { }
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virtual
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~__codecvt_abstract_base() { }
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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 = 0;
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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 = 0;
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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 = 0;
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virtual int
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do_encoding() const throw() = 0;
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virtual bool
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do_always_noconv() const throw() = 0;
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virtual int
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do_length(const state_type&, const extern_type* __from,
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const extern_type* __end, size_t __max) const = 0;
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virtual int
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do_max_length() const throw() = 0;
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};
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// 22.2.1.5 Template class codecvt
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// NB: Generic, mostly useless implementation.
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template<typename _InternT, typename _ExternT, typename _StateT>
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class codecvt
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: public __codecvt_abstract_base<_InternT, _ExternT, _StateT>
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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 _StateT state_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<_InternT,_ExternT,_StateT> (__refs) { }
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protected:
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virtual
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~codecvt() { }
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};
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template<typename _InternT, typename _ExternT, typename _StateT>
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locale::id codecvt<_InternT, _ExternT, _StateT>::id;
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#ifdef _GLIBCPP_USE_WCHAR_T
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// partial specialization
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// This specialization takes advantage of iconv to provide code
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// 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, __enc_traits>
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: public __codecvt_abstract_base<_InternT, _ExternT, __enc_traits>
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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 __enc_traits state_type;
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typedef __enc_traits::__desc_type __desc_type;
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typedef __enc_traits __enc_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(__enc_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(const 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, __enc_traits>::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 is what the standard is (apparently) due to use
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// in the future. Using this adaptor, g++ will do the work for us.
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template<typename _T>
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inline size_t
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__iconv_adaptor(size_t(*iconv_func)(iconv_t, _T, size_t*, char**, size_t*),
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iconv_t cd, char** inbuf, size_t* inbytesleft,
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char** outbuf, size_t* outbytesleft)
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{
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return iconv_func(cd, (_T)inbuf, inbytesleft, outbuf, outbytesleft);
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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, __enc_traits>::
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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 = error;
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if (__state._M_good())
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{
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typedef state_type::__desc_type __desc_type;
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const __desc_type* __desc = __state._M_get_out_descriptor();
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const size_t __fmultiple = sizeof(intern_type) / sizeof(char);
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size_t __flen = __fmultiple * (__from_end - __from);
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const size_t __tmultiple = sizeof(extern_type) / sizeof(char);
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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 __int_bom = __state._M_get_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*>(__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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&__flen, &__cto, &__tlen);
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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,
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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 intern_type*>(__cfrom);
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__to_next = reinterpret_cast<extern_type*>(__cto);
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__ret = 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 intern_type*>(__cfrom);
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__to_next = reinterpret_cast<extern_type*>(__cto);
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__ret = partial;
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}
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else
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__ret = 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, __enc_traits>::
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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 = error;
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if (__state._M_good())
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{
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typedef state_type::__desc_type __desc_type;
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const __desc_type* __desc = __state._M_get_in_descriptor();
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const size_t __tmultiple = sizeof(intern_type) / sizeof(char);
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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, NULL, NULL,
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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 = noconv;
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else if (__tlen == 0)
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__ret = ok;
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else
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__ret = partial;
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}
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else
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__ret = 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, __enc_traits>::
|
|
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 = error;
|
|
if (__state._M_good())
|
|
{
|
|
typedef state_type::__desc_type __desc_type;
|
|
const __desc_type* __desc = __state._M_get_in_descriptor();
|
|
const size_t __fmultiple = sizeof(extern_type) / sizeof(char);
|
|
size_t __flen = __fmultiple * (__from_end - __from);
|
|
const size_t __tmultiple = sizeof(intern_type) / sizeof(char);
|
|
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<char*>(__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._M_get_external_bom();
|
|
if (__ext_bom)
|
|
{
|
|
size_t __size = __from_end - __from;
|
|
extern_type* __cfixed = static_cast<extern_type*>(__builtin_alloca(sizeof(extern_type) * (__size + 1)));
|
|
__cfixed[0] = static_cast<extern_type>(__ext_bom);
|
|
char_traits<extern_type>::copy(__cfixed + 1, __from, __size);
|
|
__cfrom = reinterpret_cast<char*>(__cfixed);
|
|
__conv = __iconv_adaptor(iconv, *__desc, &__cfrom,
|
|
&__flen, &__cto, &__tlen);
|
|
}
|
|
else
|
|
{
|
|
extern_type* __cfixed = const_cast<extern_type*>(__from);
|
|
__cfrom = reinterpret_cast<char*>(__cfixed);
|
|
__conv = __iconv_adaptor(iconv, *__desc, &__cfrom,
|
|
&__flen, &__cto, &__tlen);
|
|
}
|
|
|
|
|
|
if (__conv != size_t(-1))
|
|
{
|
|
__from_next = reinterpret_cast<const extern_type*>(__cfrom);
|
|
__to_next = reinterpret_cast<intern_type*>(__cto);
|
|
__ret = ok;
|
|
}
|
|
else
|
|
{
|
|
if (__flen < static_cast<size_t>(__from_end - __from))
|
|
{
|
|
__from_next = reinterpret_cast<const extern_type*>(__cfrom);
|
|
__to_next = reinterpret_cast<intern_type*>(__cto);
|
|
__ret = partial;
|
|
}
|
|
else
|
|
__ret = error;
|
|
}
|
|
}
|
|
return __ret;
|
|
}
|
|
|
|
template<typename _InternT, typename _ExternT>
|
|
int
|
|
codecvt<_InternT, _ExternT, __enc_traits>::
|
|
do_encoding() const throw()
|
|
{ return 0; }
|
|
|
|
template<typename _InternT, typename _ExternT>
|
|
bool
|
|
codecvt<_InternT, _ExternT, __enc_traits>::
|
|
do_always_noconv() const throw()
|
|
{ return false; }
|
|
|
|
template<typename _InternT, typename _ExternT>
|
|
int
|
|
codecvt<_InternT, _ExternT, __enc_traits>::
|
|
do_length(const state_type&, const extern_type* __from,
|
|
const extern_type* __end, size_t __max) const
|
|
{ return min(__max, static_cast<size_t>(__end - __from)); }
|
|
|
|
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
|
|
// 74. Garbled text for codecvt::do_max_length
|
|
template<typename _InternT, typename _ExternT>
|
|
int
|
|
codecvt<_InternT, _ExternT, __enc_traits>::
|
|
do_max_length() const throw()
|
|
{ return 1; }
|
|
#endif
|
|
#endif /* _GLIBCPP_USE_WCHAR_T */
|
|
|
|
// codecvt<char, char, mbstate_t> required specialization
|
|
template<>
|
|
class codecvt<char, char, mbstate_t>
|
|
: public __codecvt_abstract_base<char, char, mbstate_t>
|
|
{
|
|
public:
|
|
// Types:
|
|
typedef char intern_type;
|
|
typedef char extern_type;
|
|
typedef mbstate_t state_type;
|
|
|
|
// Data Members:
|
|
static locale::id id;
|
|
|
|
explicit
|
|
codecvt(size_t __refs = 0);
|
|
|
|
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(const state_type&, const extern_type* __from,
|
|
const extern_type* __end, size_t __max) const;
|
|
|
|
virtual int
|
|
do_max_length() const throw();
|
|
};
|
|
|
|
#ifdef _GLIBCPP_USE_WCHAR_T
|
|
// codecvt<wchar_t, char, mbstate_t> required specialization
|
|
template<>
|
|
class codecvt<wchar_t, char, mbstate_t>
|
|
: public __codecvt_abstract_base<wchar_t, char, mbstate_t>
|
|
{
|
|
public:
|
|
// Types:
|
|
typedef wchar_t intern_type;
|
|
typedef char extern_type;
|
|
typedef mbstate_t state_type;
|
|
|
|
// Data Members:
|
|
static locale::id id;
|
|
|
|
explicit
|
|
codecvt(size_t __refs = 0);
|
|
|
|
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(const state_type&, const extern_type* __from,
|
|
const extern_type* __end, size_t __max) const;
|
|
|
|
virtual int
|
|
do_max_length() const throw();
|
|
};
|
|
#endif //_GLIBCPP_USE_WCHAR_T
|
|
|
|
// 22.2.1.6 Template class codecvt_byname
|
|
template<typename _InternT, typename _ExternT, typename _StateT>
|
|
class codecvt_byname : public codecvt<_InternT, _ExternT, _StateT>
|
|
{
|
|
public:
|
|
explicit
|
|
codecvt_byname(const char*, size_t __refs = 0)
|
|
: codecvt<_InternT, _ExternT, _StateT>(__refs) { }
|
|
protected:
|
|
virtual
|
|
~codecvt_byname() { }
|
|
};
|
|
|
|
#endif // _CPP_BITS_CODECVT_H
|
|
|
|
// Local Variables:
|
|
// mode:c++
|
|
// End:
|
|
|