459 lines
15 KiB
C++
459 lines
15 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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// 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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// 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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// XXX
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// Define this here to codecvt.cc can have _S_max_size definition.
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#define _GLIBCPP_USE___ENC_TRAITS 1
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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(const locale& __loc = locale())
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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, solaris)
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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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// XXX There has got to be a better way to do this.
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__c_locale __cloc;
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locale::facet::_S_create_c_locale(__cloc, __loc.name().c_str());
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strcpy(_M_ext_enc, __nl_langinfo_l(CODESET, __cloc));
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locale::facet::_S_destroy_c_locale(__cloc);
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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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__desc_type __err = reinterpret_cast<iconv_t>(-1);
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if (_M_in_desc && _M_in_desc != __err)
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iconv_close(_M_in_desc);
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if (_M_out_desc && _M_out_desc != __err)
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iconv_close(_M_out_desc);
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}
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void
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_M_init()
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{
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__desc_type __err = reinterpret_cast<iconv_t>(-1);
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_M_in_desc = iconv_open(_M_int_enc, _M_ext_enc);
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if (_M_in_desc == __err)
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__throw_runtime_error("creating iconv input descriptor failed.");
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_M_out_desc = iconv_open(_M_ext_enc, _M_int_enc);
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if (_M_out_desc == __err)
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__throw_runtime_error("creating iconv output descriptor failed.");
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}
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bool
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_M_good()
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{
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__desc_type __err = reinterpret_cast<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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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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// 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>::
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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 = 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 __fmultiple = sizeof(extern_type) / sizeof(char);
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size_t __flen = __fmultiple * (__from_end - __from);
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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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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._M_get_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*>(__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 = 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 = 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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int
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codecvt<_InternT, _ExternT, __enc_traits>::
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do_encoding() const throw()
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{ return 0; }
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template<typename _InternT, typename _ExternT>
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bool
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codecvt<_InternT, _ExternT, __enc_traits>::
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do_always_noconv() const throw()
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{ return false; }
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template<typename _InternT, typename _ExternT>
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int
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codecvt<_InternT, _ExternT, __enc_traits>::
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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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{ return min(__max, static_cast<size_t>(__end - __from)); }
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#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
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// 74. Garbled text for codecvt::do_max_length
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template<typename _InternT, typename _ExternT>
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int
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codecvt<_InternT, _ExternT, __enc_traits>::
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do_max_length() const throw()
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{ return 1; }
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#endif
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