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// Locale support (codecvt) -*- C++ -*-
// Copyright (C) 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
//
// ISO C++ 14882: 22.2.1.5 Template class codecvt
//
// Warning: this file is not meant for user inclusion. Use <locale>.
// Written by Benjamin Kosnik <bkoz@cygnus.com>
/** @file bits/codecvt_specializations.h
* This is an internal header file, included by other library headers.
* You should not attempt to use it directly.
*/
// XXX
// Define this here so codecvt.cc can have _S_max_size definition.
#define _GLIBCXX_USE___ENC_TRAITS 1
/// @brief Extension to use icov for dealing with character encodings.
// This includes conversions and comparisons between various character
// sets. This object encapsulates data that may need to be shared between
// char_traits, codecvt and ctype.
class __enc_traits
{
public:
// Types:
// NB: A conversion descriptor subsumes and enhances the
// functionality of a simple state type such as mbstate_t.
typedef iconv_t __desc_type;
protected:
// Data Members:
// Max size of charset encoding name
static const int _S_max_size = 32;
// Name of internal character set encoding.
char _M_int_enc[_S_max_size];
// Name of external character set encoding.
char _M_ext_enc[_S_max_size];
// Conversion descriptor between external encoding to internal encoding.
__desc_type _M_in_desc;
// Conversion descriptor between internal encoding to external encoding.
__desc_type _M_out_desc;
// Details the byte-order marker for the external encoding, if necessary.
int _M_ext_bom;
// Details the byte-order marker for the internal encoding, if necessary.
int _M_int_bom;
public:
explicit __enc_traits()
: _M_in_desc(0), _M_out_desc(0), _M_ext_bom(0), _M_int_bom(0)
{
memset(_M_int_enc, 0, _S_max_size);
memset(_M_ext_enc, 0, _S_max_size);
}
explicit __enc_traits(const char* __int, const char* __ext,
int __ibom = 0, int __ebom = 0)
: _M_in_desc(0), _M_out_desc(0), _M_ext_bom(__ebom), _M_int_bom(__ibom)
{
strncpy(_M_int_enc, __int, _S_max_size);
strncpy(_M_ext_enc, __ext, _S_max_size);
_M_init();
}
// 21.1.2 traits typedefs
// p4
// typedef STATE_T state_type
// requires: state_type shall meet the requirements of
// CopyConstructible types (20.1.3)
// NB: This does not preseve the actual state of the conversion
// descriptor member, but it does duplicate the encoding
// information.
__enc_traits(const __enc_traits& __obj): _M_in_desc(0), _M_out_desc(0)
{
strncpy(_M_int_enc, __obj._M_int_enc, _S_max_size);
strncpy(_M_ext_enc, __obj._M_ext_enc, _S_max_size);
_M_ext_bom = __obj._M_ext_bom;
_M_int_bom = __obj._M_int_bom;
_M_destroy();
_M_init();
}
// Need assignment operator as well.
__enc_traits&
operator=(const __enc_traits& __obj)
{
strncpy(_M_int_enc, __obj._M_int_enc, _S_max_size);
strncpy(_M_ext_enc, __obj._M_ext_enc, _S_max_size);
_M_ext_bom = __obj._M_ext_bom;
_M_int_bom = __obj._M_int_bom;
_M_destroy();
_M_init();
return *this;
}
~__enc_traits()
{ _M_destroy(); }
void
_M_init()
{
const __desc_type __err = reinterpret_cast<iconv_t>(-1);
if (!_M_in_desc)
{
_M_in_desc = iconv_open(_M_int_enc, _M_ext_enc);
if (_M_in_desc == __err)
__throw_runtime_error(__N("__enc_traits::_M_init "
"creating iconv input descriptor failed"));
}
if (!_M_out_desc)
{
_M_out_desc = iconv_open(_M_ext_enc, _M_int_enc);
if (_M_out_desc == __err)
__throw_runtime_error(__N("__enc_traits::_M_init "
"creating iconv output descriptor failed"));
}
}
void
_M_destroy()
{
const __desc_type __err = reinterpret_cast<iconv_t>(-1);
if (_M_in_desc && _M_in_desc != __err)
{
iconv_close(_M_in_desc);
_M_in_desc = 0;
}
if (_M_out_desc && _M_out_desc != __err)
{
iconv_close(_M_out_desc);
_M_out_desc = 0;
}
}
bool
_M_good()
{
const __desc_type __err = reinterpret_cast<iconv_t>(-1);
bool __test = _M_in_desc && _M_in_desc != __err;
__test &= _M_out_desc && _M_out_desc != __err;
return __test;
}
const __desc_type*
_M_get_in_descriptor()
{ return &_M_in_desc; }
const __desc_type*
_M_get_out_descriptor()
{ return &_M_out_desc; }
int
_M_get_external_bom()
{ return _M_ext_bom; }
int
_M_get_internal_bom()
{ return _M_int_bom; }
const char*
_M_get_internal_enc()
{ return _M_int_enc; }
const char*
_M_get_external_enc()
{ return _M_ext_enc; }
};
/// @brief class codecvt<InternT, _ExternT, __enc_traits> specialization.
// This partial specialization takes advantage of iconv to provide
// code conversions between a large number of character encodings.
template<typename _InternT, typename _ExternT>
class codecvt<_InternT, _ExternT, __enc_traits>
: public __codecvt_abstract_base<_InternT, _ExternT, __enc_traits>
{
public:
// Types:
typedef codecvt_base::result result;
typedef _InternT intern_type;
typedef _ExternT extern_type;
typedef __enc_traits state_type;
typedef __enc_traits::__desc_type __desc_type;
typedef __enc_traits __enc_type;
// Data Members:
static locale::id id;
explicit
codecvt(size_t __refs = 0)
: __codecvt_abstract_base<intern_type, extern_type, state_type>(__refs)
{ }
explicit
codecvt(__enc_type* __enc, size_t __refs = 0)
: __codecvt_abstract_base<intern_type, extern_type, state_type>(__refs)
{ }
protected:
virtual
~codecvt() { }
virtual result
do_out(state_type& __state, const intern_type* __from,
const intern_type* __from_end, const intern_type*& __from_next,
extern_type* __to, extern_type* __to_end,
extern_type*& __to_next) const;
virtual result
do_unshift(state_type& __state, extern_type* __to,
extern_type* __to_end, extern_type*& __to_next) const;
virtual result
do_in(state_type& __state, const extern_type* __from,
const extern_type* __from_end, const extern_type*& __from_next,
intern_type* __to, intern_type* __to_end,
intern_type*& __to_next) const;
virtual int
do_encoding() const throw();
virtual bool
do_always_noconv() const throw();
virtual int
do_length(state_type&, const extern_type* __from,
const extern_type* __end, size_t __max) const;
virtual int
do_max_length() const throw();
};
template<typename _InternT, typename _ExternT>
locale::id
codecvt<_InternT, _ExternT, __enc_traits>::id;
// This adaptor works around the signature problems of the second
// argument to iconv(): SUSv2 and others use 'const char**', but glibc 2.2
// uses 'char**', which matches the POSIX 1003.1-2001 standard.
// Using this adaptor, g++ will do the work for us.
template<typename _T>
inline size_t
__iconv_adaptor(size_t(*__func)(iconv_t, _T, size_t*, char**, size_t*),
iconv_t __cd, char** __inbuf, size_t* __inbytes,
char** __outbuf, size_t* __outbytes)
{ return __func(__cd, (_T)__inbuf, __inbytes, __outbuf, __outbytes); }
template<typename _InternT, typename _ExternT>
codecvt_base::result
codecvt<_InternT, _ExternT, __enc_traits>::
do_out(state_type& __state, const intern_type* __from,
const intern_type* __from_end, const intern_type*& __from_next,
extern_type* __to, extern_type* __to_end,
extern_type*& __to_next) const
{
result __ret = codecvt_base::error;
if (__state._M_good())
{
typedef state_type::__desc_type __desc_type;
const __desc_type* __desc = __state._M_get_out_descriptor();
const size_t __fmultiple = sizeof(intern_type);
size_t __fbytes = __fmultiple * (__from_end - __from);
const size_t __tmultiple = sizeof(extern_type);
size_t __tbytes = __tmultiple * (__to_end - __to);
// Argument list for iconv specifies a byte sequence. Thus,
// all to/from arrays must be brutally casted to char*.
char* __cto = reinterpret_cast<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 __int_bom = __state._M_get_internal_bom();
if (__int_bom)
{
size_t __size = __from_end - __from;
intern_type* __cfixed = static_cast<intern_type*>(__builtin_alloca(sizeof(intern_type) * (__size + 1)));
__cfixed[0] = static_cast<intern_type>(__int_bom);
char_traits<intern_type>::copy(__cfixed + 1, __from, __size);
__cfrom = reinterpret_cast<char*>(__cfixed);
__conv = __iconv_adaptor(iconv, *__desc, &__cfrom,
&__fbytes, &__cto, &__tbytes);
}
else
{
intern_type* __cfixed = const_cast<intern_type*>(__from);
__cfrom = reinterpret_cast<char*>(__cfixed);
__conv = __iconv_adaptor(iconv, *__desc, &__cfrom, &__fbytes,
&__cto, &__tbytes);
}
if (__conv != size_t(-1))
{
__from_next = reinterpret_cast<const intern_type*>(__cfrom);
__to_next = reinterpret_cast<extern_type*>(__cto);
__ret = codecvt_base::ok;
}
else
{
if (__fbytes < __fmultiple * (__from_end - __from))
{
__from_next = reinterpret_cast<const intern_type*>(__cfrom);
__to_next = reinterpret_cast<extern_type*>(__cto);
__ret = codecvt_base::partial;
}
else
__ret = codecvt_base::error;
}
}
return __ret;
}
template<typename _InternT, typename _ExternT>
codecvt_base::result
codecvt<_InternT, _ExternT, __enc_traits>::
do_unshift(state_type& __state, extern_type* __to,
extern_type* __to_end, extern_type*& __to_next) const
{
result __ret = codecvt_base::error;
if (__state._M_good())
{
typedef state_type::__desc_type __desc_type;
const __desc_type* __desc = __state._M_get_in_descriptor();
const size_t __tmultiple = sizeof(intern_type);
size_t __tlen = __tmultiple * (__to_end - __to);
// Argument list for iconv specifies a byte sequence. Thus,
// all to/from arrays must be brutally casted to char*.
char* __cto = reinterpret_cast<char*>(__to);
size_t __conv = __iconv_adaptor(iconv,*__desc, NULL, NULL,
&__cto, &__tlen);
if (__conv != size_t(-1))
{
__to_next = reinterpret_cast<extern_type*>(__cto);
if (__tlen == __tmultiple * (__to_end - __to))
__ret = codecvt_base::noconv;
else if (__tlen == 0)
__ret = codecvt_base::ok;
else
__ret = codecvt_base::partial;
}
else
__ret = codecvt_base::error;
}
return __ret;
}
template<typename _InternT, typename _ExternT>
codecvt_base::result
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 = codecvt_base::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);
size_t __flen = __fmultiple * (__from_end - __from);
const size_t __tmultiple = sizeof(intern_type);
size_t __tlen = __tmultiple * (__to_end - __to);
// Argument list for iconv specifies a byte sequence. Thus,
// all to/from arrays must be brutally casted to char*.
char* __cto = reinterpret_cast<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 = codecvt_base::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 = codecvt_base::partial;
}
else
__ret = codecvt_base::error;
}
}
return __ret;
}
template<typename _InternT, typename _ExternT>
int
codecvt<_InternT, _ExternT, __enc_traits>::
do_encoding() const throw()
{
int __ret = 0;
if (sizeof(_ExternT) <= sizeof(_InternT))
__ret = sizeof(_InternT)/sizeof(_ExternT);
return __ret;
}
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(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, __enc_traits>::
do_max_length() const throw()
{ return 1; }
|