0,0 → 1,717 |
// Locale support (codecvt) -*- C++ -*- |
|
// Copyright (C) 2000, 2001 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> |
|
#ifndef _CPP_BITS_CODECVT_H |
#define _CPP_BITS_CODECVT_H 1 |
|
#pragma GCC system_header |
|
// XXX |
// __enc_traits may need to move up the locale header hierarchy, |
// depending on if ctype ends up using it. |
|
#ifdef _GLIBCPP_USE_WCHAR_T |
// Extensions to use icov for dealing with character encodings, |
// including conversions and comparisons between various character |
// sets. This object encapsulates data that may need to be shared between |
// char_traits, codecvt and ctype. |
|
#if _GLIBCPP_USE_SHADOW_HEADERS |
using _C_legacy::CODESET; |
#endif |
|
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: |
__enc_traits() |
: _M_in_desc(0), _M_out_desc(0), _M_ext_bom(0), _M_int_bom(0) |
{ |
// __intc_end = whatever we are using internally, which is |
// UCS4 (linux) |
// UCS2 == UNICODE (microsoft, java, aix, whatever...) |
// XXX Currently don't know how to get this data from target system... |
strcpy(_M_int_enc, "UCS4"); |
|
// __extc_end = external codeset in current locale |
strcpy(_M_ext_enc, nl_langinfo(CODESET)); |
} |
|
__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(0), _M_int_bom(0) |
{ |
strncpy(_M_int_enc, __int, _S_max_size); |
strncpy(_M_ext_enc, __ext, _S_max_size); |
} |
|
// 21.1.2 traits typedefs |
// p4 |
// typedef STATE_T state_type |
// requires: state_type shall meet the requirements of |
// CopyConstructible types (20.1.3) |
__enc_traits(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; |
} |
|
~__enc_traits() |
{ |
iconv_close(_M_in_desc); |
iconv_close(_M_out_desc); |
} |
|
// Initializes |
void |
_M_init() |
{ |
_M_in_desc = iconv_open(_M_int_enc, _M_ext_enc); |
_M_out_desc = iconv_open(_M_ext_enc, _M_int_enc); |
if (_M_out_desc == iconv_t(-1) || _M_in_desc == iconv_t(-1)) |
{ |
// XXX Extended error checking. |
} |
} |
|
bool |
_M_good() |
{ |
return _M_out_desc && _M_in_desc |
&& _M_out_desc != iconv_t(-1) && _M_in_desc != iconv_t(-1); |
} |
|
const __desc_type* |
_M_get_in_descriptor() |
{ return &_M_in_desc; } |
|
const __desc_type* |
_M_get_out_descriptor() |
{ return &_M_out_desc; } |
|
const char* |
_M_get_internal_enc() |
{ return _M_int_enc; } |
|
const char* |
_M_get_external_enc() |
{ return _M_ext_enc; } |
|
int |
_M_get_external_bom() |
{ return _M_ext_bom; } |
|
int |
_M_get_internal_bom() |
{ return _M_int_bom; } |
}; |
#endif //_GLIBCPP_USE_WCHAR_T |
|
|
// 22.2.1.5 Template class codecvt |
class codecvt_base |
{ |
public: |
enum result |
{ |
ok, |
partial, |
error, |
noconv |
}; |
}; |
|
// Template class __codecvt_abstract_base |
// NB: An abstract base class that fills in the public inlines, so |
// that the specializations don't have to re-copy the public |
// interface. |
template<typename _InternT, typename _ExternT, typename _StateT> |
class __codecvt_abstract_base |
: public locale::facet, public codecvt_base |
{ |
public: |
// Types: |
typedef codecvt_base::result result; |
typedef _InternT intern_type; |
typedef _ExternT extern_type; |
typedef _StateT state_type; |
|
// 22.2.1.5.1 codecvt members |
result |
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 |
{ |
return this->do_out(__state, __from, __from_end, __from_next, |
__to, __to_end, __to_next); |
} |
|
result |
unshift(state_type& __state, extern_type* __to, extern_type* __to_end, |
extern_type*& __to_next) const |
{ return this->do_unshift(__state, __to,__to_end,__to_next); } |
|
result |
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 |
{ |
return this->do_in(__state, __from, __from_end, __from_next, |
__to, __to_end, __to_next); |
} |
|
int |
encoding() const throw() |
{ return this->do_encoding(); } |
|
bool |
always_noconv() const throw() |
{ return this->do_always_noconv(); } |
|
int |
length(const state_type& __state, const extern_type* __from, |
const extern_type* __end, size_t __max) const |
{ return this->do_length(__state, __from, __end, __max); } |
|
int |
max_length() const throw() |
{ return this->do_max_length(); } |
|
protected: |
explicit |
__codecvt_abstract_base(size_t __refs = 0) : locale::facet(__refs) { } |
|
virtual |
~__codecvt_abstract_base() { } |
|
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 = 0; |
|
virtual result |
do_unshift(state_type& __state, extern_type* __to, |
extern_type* __to_end, extern_type*& __to_next) const = 0; |
|
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 = 0; |
|
virtual int |
do_encoding() const throw() = 0; |
|
virtual bool |
do_always_noconv() const throw() = 0; |
|
virtual int |
do_length(const state_type&, const extern_type* __from, |
const extern_type* __end, size_t __max) const = 0; |
|
virtual int |
do_max_length() const throw() = 0; |
}; |
|
// 22.2.1.5 Template class codecvt |
// NB: Generic, mostly useless implementation. |
template<typename _InternT, typename _ExternT, typename _StateT> |
class codecvt |
: public __codecvt_abstract_base<_InternT, _ExternT, _StateT> |
{ |
public: |
// Types: |
typedef codecvt_base::result result; |
typedef _InternT intern_type; |
typedef _ExternT extern_type; |
typedef _StateT state_type; |
|
// Data Members: |
static locale::id id; |
|
explicit |
codecvt(size_t __refs = 0) |
: __codecvt_abstract_base<_InternT,_ExternT,_StateT> (__refs) { } |
|
protected: |
virtual |
~codecvt() { } |
}; |
|
template<typename _InternT, typename _ExternT, typename _StateT> |
locale::id codecvt<_InternT, _ExternT, _StateT>::id; |
|
#ifdef _GLIBCPP_USE_WCHAR_T |
// partial specialization |
// This 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(const 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 is what the standard is (apparently) due to use |
// in the future. Using this adaptor, g++ will do the work for us. |
template<typename _T> |
inline size_t |
__iconv_adaptor(size_t(*iconv_func)(iconv_t, _T, size_t*, char**, size_t*), |
iconv_t cd, char** inbuf, size_t* inbytesleft, |
char** outbuf, size_t* outbytesleft) |
{ |
return iconv_func(cd, (_T)inbuf, inbytesleft, outbuf, outbytesleft); |
} |
|
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 = 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) / sizeof(char); |
size_t __flen = __fmultiple * (__from_end - __from); |
const size_t __tmultiple = sizeof(extern_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 __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, |
&__flen, &__cto, &__tlen); |
} |
else |
{ |
intern_type* __cfixed = const_cast<intern_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 intern_type*>(__cfrom); |
__to_next = reinterpret_cast<extern_type*>(__cto); |
__ret = ok; |
} |
else |
{ |
if (__flen < static_cast<size_t>(__from_end - __from)) |
{ |
__from_next = reinterpret_cast<const intern_type*>(__cfrom); |
__to_next = reinterpret_cast<extern_type*>(__cto); |
__ret = partial; |
} |
else |
__ret = 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 = 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) / 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); |
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 = noconv; |
else if (__tlen == 0) |
__ret = ok; |
else |
__ret = partial; |
} |
else |
__ret = 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 = 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 |
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// Local Variables: |
// mode:c++ |
// End: |
|