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1 | // Locale support (codecvt) -*- C++ -*- |
2 | ||
8fc81078 PC |
3 | // Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, |
4 | // 2008, 2009, 2010 | |
5 | // Free Software Foundation, Inc. | |
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6 | // |
7 | // This file is part of the GNU ISO C++ Library. This library is free | |
8 | // software; you can redistribute it and/or modify it under the | |
9 | // terms of the GNU General Public License as published by the | |
748086b7 | 10 | // Free Software Foundation; either version 3, or (at your option) |
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11 | // any later version. |
12 | ||
13 | // This library is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
748086b7 JJ |
18 | // Under Section 7 of GPL version 3, you are granted additional |
19 | // permissions described in the GCC Runtime Library Exception, version | |
20 | // 3.1, as published by the Free Software Foundation. | |
21 | ||
22 | // You should have received a copy of the GNU General Public License and | |
23 | // a copy of the GCC Runtime Library Exception along with this program; | |
24 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
25 | // <http://www.gnu.org/licenses/>. | |
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26 | |
27 | // | |
28 | // ISO C++ 14882: 22.2.1.5 Template class codecvt | |
29 | // | |
30 | ||
825bd0e1 | 31 | // Written by Benjamin Kosnik <bkoz@redhat.com> |
33590f13 | 32 | |
6ab63942 | 33 | /** @file ext/codecvt_specializations.h |
825bd0e1 | 34 | * This file is a GNU extension to the Standard C++ Library. |
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35 | */ |
36 | ||
6ab63942 PC |
37 | #ifndef _EXT_CODECVT_SPECIALIZATIONS_H |
38 | #define _EXT_CODECVT_SPECIALIZATIONS_H 1 | |
39 | ||
d5fa9a0d | 40 | #include <bits/c++config.h> |
6ab63942 PC |
41 | #include <locale> |
42 | #include <iconv.h> | |
43 | ||
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44 | _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) |
45 | ||
939759fc | 46 | /// Extension to use iconv for dealing with character encodings. |
6309eefc | 47 | // This includes conversions and comparisons between various character |
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48 | // sets. This object encapsulates data that may need to be shared between |
49 | // char_traits, codecvt and ctype. | |
825bd0e1 | 50 | class encoding_state |
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51 | { |
52 | public: | |
53 | // Types: | |
54 | // NB: A conversion descriptor subsumes and enhances the | |
55 | // functionality of a simple state type such as mbstate_t. | |
825bd0e1 | 56 | typedef iconv_t descriptor_type; |
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57 | |
58 | protected: | |
33590f13 | 59 | // Name of internal character set encoding. |
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60 | std::string _M_int_enc; |
61 | ||
33590f13 | 62 | // Name of external character set encoding. |
825bd0e1 | 63 | std::string _M_ext_enc; |
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64 | |
65 | // Conversion descriptor between external encoding to internal encoding. | |
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66 | descriptor_type _M_in_desc; |
67 | ||
33590f13 | 68 | // Conversion descriptor between internal encoding to external encoding. |
825bd0e1 | 69 | descriptor_type _M_out_desc; |
33590f13 | 70 | |
825bd0e1 | 71 | // The byte-order marker for the external encoding, if necessary. |
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72 | int _M_ext_bom; |
73 | ||
825bd0e1 | 74 | // The byte-order marker for the internal encoding, if necessary. |
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75 | int _M_int_bom; |
76 | ||
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77 | // Number of external bytes needed to construct one complete |
78 | // character in the internal encoding. | |
79 | // NB: -1 indicates variable, or stateful, encodings. | |
80 | int _M_bytes; | |
6f48900c | 81 | |
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82 | public: |
83 | explicit | |
84 | encoding_state() | |
85 | : _M_in_desc(0), _M_out_desc(0), _M_ext_bom(0), _M_int_bom(0), _M_bytes(0) | |
86 | { } | |
87 | ||
88 | explicit | |
89 | encoding_state(const char* __int, const char* __ext, | |
90 | int __ibom = 0, int __ebom = 0, int __bytes = 1) | |
91 | : _M_int_enc(__int), _M_ext_enc(__ext), _M_in_desc(0), _M_out_desc(0), | |
92 | _M_ext_bom(__ebom), _M_int_bom(__ibom), _M_bytes(__bytes) | |
93 | { init(); } | |
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94 | |
95 | // 21.1.2 traits typedefs | |
96 | // p4 | |
97 | // typedef STATE_T state_type | |
98 | // requires: state_type shall meet the requirements of | |
99 | // CopyConstructible types (20.1.3) | |
28dac70a | 100 | // NB: This does not preserve the actual state of the conversion |
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101 | // descriptor member, but it does duplicate the encoding |
102 | // information. | |
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103 | encoding_state(const encoding_state& __obj) : _M_in_desc(0), _M_out_desc(0) |
104 | { construct(__obj); } | |
33590f13 | 105 | |
6f48900c | 106 | // Need assignment operator as well. |
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107 | encoding_state& |
108 | operator=(const encoding_state& __obj) | |
6f48900c | 109 | { |
825bd0e1 | 110 | construct(__obj); |
7aacf989 | 111 | return *this; |
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112 | } |
113 | ||
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114 | ~encoding_state() |
115 | { destroy(); } | |
33590f13 | 116 | |
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117 | bool |
118 | good() const throw() | |
119 | { | |
5f232232 | 120 | const descriptor_type __err = (iconv_t)(-1); |
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121 | bool __test = _M_in_desc && _M_in_desc != __err; |
122 | __test &= _M_out_desc && _M_out_desc != __err; | |
123 | return __test; | |
124 | } | |
125 | ||
126 | int | |
127 | character_ratio() const | |
128 | { return _M_bytes; } | |
129 | ||
130 | const std::string | |
131 | internal_encoding() const | |
132 | { return _M_int_enc; } | |
133 | ||
134 | int | |
135 | internal_bom() const | |
136 | { return _M_int_bom; } | |
137 | ||
138 | const std::string | |
139 | external_encoding() const | |
140 | { return _M_ext_enc; } | |
141 | ||
142 | int | |
143 | external_bom() const | |
144 | { return _M_ext_bom; } | |
145 | ||
146 | const descriptor_type& | |
147 | in_descriptor() const | |
148 | { return _M_in_desc; } | |
149 | ||
150 | const descriptor_type& | |
151 | out_descriptor() const | |
152 | { return _M_out_desc; } | |
153 | ||
154 | protected: | |
33590f13 | 155 | void |
825bd0e1 | 156 | init() |
33590f13 | 157 | { |
5f232232 | 158 | const descriptor_type __err = (iconv_t)(-1); |
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159 | const bool __have_encodings = _M_int_enc.size() && _M_ext_enc.size(); |
160 | if (!_M_in_desc && __have_encodings) | |
6f48900c | 161 | { |
825bd0e1 | 162 | _M_in_desc = iconv_open(_M_int_enc.c_str(), _M_ext_enc.c_str()); |
6f48900c | 163 | if (_M_in_desc == __err) |
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164 | std::__throw_runtime_error(__N("encoding_state::_M_init " |
165 | "creating iconv input descriptor failed")); | |
6f48900c | 166 | } |
825bd0e1 | 167 | if (!_M_out_desc && __have_encodings) |
6f48900c | 168 | { |
825bd0e1 | 169 | _M_out_desc = iconv_open(_M_ext_enc.c_str(), _M_int_enc.c_str()); |
6f48900c | 170 | if (_M_out_desc == __err) |
825bd0e1 | 171 | std::__throw_runtime_error(__N("encoding_state::_M_init " |
ba9119ec | 172 | "creating iconv output descriptor failed")); |
6f48900c | 173 | } |
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174 | } |
175 | ||
a5f105b5 | 176 | void |
825bd0e1 | 177 | construct(const encoding_state& __obj) |
a5f105b5 | 178 | { |
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179 | destroy(); |
180 | _M_int_enc = __obj._M_int_enc; | |
181 | _M_ext_enc = __obj._M_ext_enc; | |
182 | _M_ext_bom = __obj._M_ext_bom; | |
183 | _M_int_bom = __obj._M_int_bom; | |
184 | _M_bytes = __obj._M_bytes; | |
185 | init(); | |
186 | } | |
187 | ||
188 | void | |
189 | destroy() throw() | |
190 | { | |
5f232232 | 191 | const descriptor_type __err = (iconv_t)(-1); |
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192 | if (_M_in_desc && _M_in_desc != __err) |
193 | { | |
194 | iconv_close(_M_in_desc); | |
195 | _M_in_desc = 0; | |
196 | } | |
197 | if (_M_out_desc && _M_out_desc != __err) | |
198 | { | |
199 | iconv_close(_M_out_desc); | |
200 | _M_out_desc = 0; | |
201 | } | |
202 | } | |
825bd0e1 | 203 | }; |
a5f105b5 | 204 | |
939759fc | 205 | /// encoding_char_traits |
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206 | // Custom traits type with encoding_state for the state type, and the |
207 | // associated fpos<encoding_state> for the position type, all other | |
208 | // bits equivalent to the required char_traits instantiations. | |
209 | template<typename _CharT> | |
210 | struct encoding_char_traits : public std::char_traits<_CharT> | |
211 | { | |
212 | typedef encoding_state state_type; | |
213 | typedef typename std::fpos<state_type> pos_type; | |
214 | }; | |
6f48900c | 215 | |
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216 | _GLIBCXX_END_NAMESPACE |
217 | ||
218 | ||
219 | _GLIBCXX_BEGIN_NAMESPACE(std) | |
220 | ||
825bd0e1 | 221 | using __gnu_cxx::encoding_state; |
33590f13 | 222 | |
939759fc | 223 | /// codecvt<InternT, _ExternT, encoding_state> specialization. |
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224 | // This partial specialization takes advantage of iconv to provide |
225 | // code conversions between a large number of character encodings. | |
33590f13 | 226 | template<typename _InternT, typename _ExternT> |
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227 | class codecvt<_InternT, _ExternT, encoding_state> |
228 | : public __codecvt_abstract_base<_InternT, _ExternT, encoding_state> | |
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229 | { |
230 | public: | |
231 | // Types: | |
232 | typedef codecvt_base::result result; | |
233 | typedef _InternT intern_type; | |
234 | typedef _ExternT extern_type; | |
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235 | typedef __gnu_cxx::encoding_state state_type; |
236 | typedef state_type::descriptor_type descriptor_type; | |
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237 | |
238 | // Data Members: | |
239 | static locale::id id; | |
240 | ||
241 | explicit | |
242 | codecvt(size_t __refs = 0) | |
243 | : __codecvt_abstract_base<intern_type, extern_type, state_type>(__refs) | |
244 | { } | |
245 | ||
246 | explicit | |
825bd0e1 | 247 | codecvt(state_type& __enc, size_t __refs = 0) |
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248 | : __codecvt_abstract_base<intern_type, extern_type, state_type>(__refs) |
249 | { } | |
250 | ||
825bd0e1 | 251 | protected: |
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252 | virtual |
253 | ~codecvt() { } | |
254 | ||
255 | virtual result | |
256 | do_out(state_type& __state, const intern_type* __from, | |
257 | const intern_type* __from_end, const intern_type*& __from_next, | |
258 | extern_type* __to, extern_type* __to_end, | |
259 | extern_type*& __to_next) const; | |
260 | ||
261 | virtual result | |
262 | do_unshift(state_type& __state, extern_type* __to, | |
263 | extern_type* __to_end, extern_type*& __to_next) const; | |
264 | ||
265 | virtual result | |
266 | do_in(state_type& __state, const extern_type* __from, | |
267 | const extern_type* __from_end, const extern_type*& __from_next, | |
268 | intern_type* __to, intern_type* __to_end, | |
269 | intern_type*& __to_next) const; | |
270 | ||
271 | virtual int | |
272 | do_encoding() const throw(); | |
273 | ||
274 | virtual bool | |
275 | do_always_noconv() const throw(); | |
276 | ||
277 | virtual int | |
e61c8e23 | 278 | do_length(state_type&, const extern_type* __from, |
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279 | const extern_type* __end, size_t __max) const; |
280 | ||
281 | virtual int | |
282 | do_max_length() const throw(); | |
283 | }; | |
284 | ||
285 | template<typename _InternT, typename _ExternT> | |
286 | locale::id | |
825bd0e1 | 287 | codecvt<_InternT, _ExternT, encoding_state>::id; |
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288 | |
289 | // This adaptor works around the signature problems of the second | |
290 | // argument to iconv(): SUSv2 and others use 'const char**', but glibc 2.2 | |
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291 | // uses 'char**', which matches the POSIX 1003.1-2001 standard. |
292 | // Using this adaptor, g++ will do the work for us. | |
bd11bebe | 293 | template<typename _Tp> |
33590f13 | 294 | inline size_t |
bd11bebe | 295 | __iconv_adaptor(size_t(*__func)(iconv_t, _Tp, size_t*, char**, size_t*), |
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296 | iconv_t __cd, char** __inbuf, size_t* __inbytes, |
297 | char** __outbuf, size_t* __outbytes) | |
bd11bebe | 298 | { return __func(__cd, (_Tp)__inbuf, __inbytes, __outbuf, __outbytes); } |
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299 | |
300 | template<typename _InternT, typename _ExternT> | |
301 | codecvt_base::result | |
825bd0e1 | 302 | codecvt<_InternT, _ExternT, encoding_state>:: |
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303 | do_out(state_type& __state, const intern_type* __from, |
304 | const intern_type* __from_end, const intern_type*& __from_next, | |
305 | extern_type* __to, extern_type* __to_end, | |
306 | extern_type*& __to_next) const | |
307 | { | |
8fbc5ae7 | 308 | result __ret = codecvt_base::error; |
825bd0e1 | 309 | if (__state.good()) |
33590f13 | 310 | { |
825bd0e1 | 311 | const descriptor_type& __desc = __state.out_descriptor(); |
99b629fa | 312 | const size_t __fmultiple = sizeof(intern_type); |
07814743 | 313 | size_t __fbytes = __fmultiple * (__from_end - __from); |
99b629fa | 314 | const size_t __tmultiple = sizeof(extern_type); |
07814743 | 315 | size_t __tbytes = __tmultiple * (__to_end - __to); |
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316 | |
317 | // Argument list for iconv specifies a byte sequence. Thus, | |
318 | // all to/from arrays must be brutally casted to char*. | |
319 | char* __cto = reinterpret_cast<char*>(__to); | |
320 | char* __cfrom; | |
321 | size_t __conv; | |
322 | ||
323 | // Some encodings need a byte order marker as the first item | |
324 | // in the byte stream, to designate endian-ness. The default | |
325 | // value for the byte order marker is NULL, so if this is | |
326 | // the case, it's not necessary and we can just go on our | |
327 | // merry way. | |
825bd0e1 | 328 | int __int_bom = __state.internal_bom(); |
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329 | if (__int_bom) |
330 | { | |
331 | size_t __size = __from_end - __from; | |
e76382b5 VR |
332 | intern_type* __cfixed = static_cast<intern_type*> |
333 | (__builtin_alloca(sizeof(intern_type) * (__size + 1))); | |
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334 | __cfixed[0] = static_cast<intern_type>(__int_bom); |
335 | char_traits<intern_type>::copy(__cfixed + 1, __from, __size); | |
336 | __cfrom = reinterpret_cast<char*>(__cfixed); | |
825bd0e1 | 337 | __conv = __iconv_adaptor(iconv, __desc, &__cfrom, |
07814743 | 338 | &__fbytes, &__cto, &__tbytes); |
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339 | } |
340 | else | |
341 | { | |
342 | intern_type* __cfixed = const_cast<intern_type*>(__from); | |
343 | __cfrom = reinterpret_cast<char*>(__cfixed); | |
825bd0e1 | 344 | __conv = __iconv_adaptor(iconv, __desc, &__cfrom, &__fbytes, |
07814743 | 345 | &__cto, &__tbytes); |
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346 | } |
347 | ||
348 | if (__conv != size_t(-1)) | |
349 | { | |
350 | __from_next = reinterpret_cast<const intern_type*>(__cfrom); | |
351 | __to_next = reinterpret_cast<extern_type*>(__cto); | |
8fbc5ae7 | 352 | __ret = codecvt_base::ok; |
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353 | } |
354 | else | |
355 | { | |
07814743 | 356 | if (__fbytes < __fmultiple * (__from_end - __from)) |
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357 | { |
358 | __from_next = reinterpret_cast<const intern_type*>(__cfrom); | |
359 | __to_next = reinterpret_cast<extern_type*>(__cto); | |
8fbc5ae7 | 360 | __ret = codecvt_base::partial; |
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361 | } |
362 | else | |
8fbc5ae7 | 363 | __ret = codecvt_base::error; |
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364 | } |
365 | } | |
366 | return __ret; | |
367 | } | |
368 | ||
369 | template<typename _InternT, typename _ExternT> | |
370 | codecvt_base::result | |
825bd0e1 | 371 | codecvt<_InternT, _ExternT, encoding_state>:: |
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372 | do_unshift(state_type& __state, extern_type* __to, |
373 | extern_type* __to_end, extern_type*& __to_next) const | |
374 | { | |
8fbc5ae7 | 375 | result __ret = codecvt_base::error; |
825bd0e1 | 376 | if (__state.good()) |
33590f13 | 377 | { |
825bd0e1 | 378 | const descriptor_type& __desc = __state.in_descriptor(); |
99b629fa | 379 | const size_t __tmultiple = sizeof(intern_type); |
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380 | size_t __tlen = __tmultiple * (__to_end - __to); |
381 | ||
382 | // Argument list for iconv specifies a byte sequence. Thus, | |
383 | // all to/from arrays must be brutally casted to char*. | |
384 | char* __cto = reinterpret_cast<char*>(__to); | |
8fc81078 | 385 | size_t __conv = __iconv_adaptor(iconv,__desc, 0, 0, |
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386 | &__cto, &__tlen); |
387 | ||
388 | if (__conv != size_t(-1)) | |
389 | { | |
390 | __to_next = reinterpret_cast<extern_type*>(__cto); | |
391 | if (__tlen == __tmultiple * (__to_end - __to)) | |
8fbc5ae7 | 392 | __ret = codecvt_base::noconv; |
33590f13 | 393 | else if (__tlen == 0) |
8fbc5ae7 | 394 | __ret = codecvt_base::ok; |
33590f13 | 395 | else |
8fbc5ae7 | 396 | __ret = codecvt_base::partial; |
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397 | } |
398 | else | |
8fbc5ae7 | 399 | __ret = codecvt_base::error; |
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400 | } |
401 | return __ret; | |
402 | } | |
403 | ||
404 | template<typename _InternT, typename _ExternT> | |
405 | codecvt_base::result | |
825bd0e1 | 406 | codecvt<_InternT, _ExternT, encoding_state>:: |
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407 | do_in(state_type& __state, const extern_type* __from, |
408 | const extern_type* __from_end, const extern_type*& __from_next, | |
409 | intern_type* __to, intern_type* __to_end, | |
410 | intern_type*& __to_next) const | |
411 | { | |
8fbc5ae7 | 412 | result __ret = codecvt_base::error; |
825bd0e1 | 413 | if (__state.good()) |
33590f13 | 414 | { |
825bd0e1 | 415 | const descriptor_type& __desc = __state.in_descriptor(); |
99b629fa | 416 | const size_t __fmultiple = sizeof(extern_type); |
33590f13 | 417 | size_t __flen = __fmultiple * (__from_end - __from); |
99b629fa | 418 | const size_t __tmultiple = sizeof(intern_type); |
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419 | size_t __tlen = __tmultiple * (__to_end - __to); |
420 | ||
421 | // Argument list for iconv specifies a byte sequence. Thus, | |
422 | // all to/from arrays must be brutally casted to char*. | |
423 | char* __cto = reinterpret_cast<char*>(__to); | |
424 | char* __cfrom; | |
425 | size_t __conv; | |
426 | ||
427 | // Some encodings need a byte order marker as the first item | |
428 | // in the byte stream, to designate endian-ness. The default | |
429 | // value for the byte order marker is NULL, so if this is | |
430 | // the case, it's not necessary and we can just go on our | |
431 | // merry way. | |
825bd0e1 | 432 | int __ext_bom = __state.external_bom(); |
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433 | if (__ext_bom) |
434 | { | |
435 | size_t __size = __from_end - __from; | |
e76382b5 VR |
436 | extern_type* __cfixed = static_cast<extern_type*> |
437 | (__builtin_alloca(sizeof(extern_type) * (__size + 1))); | |
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438 | __cfixed[0] = static_cast<extern_type>(__ext_bom); |
439 | char_traits<extern_type>::copy(__cfixed + 1, __from, __size); | |
440 | __cfrom = reinterpret_cast<char*>(__cfixed); | |
825bd0e1 | 441 | __conv = __iconv_adaptor(iconv, __desc, &__cfrom, |
33590f13 BK |
442 | &__flen, &__cto, &__tlen); |
443 | } | |
444 | else | |
445 | { | |
446 | extern_type* __cfixed = const_cast<extern_type*>(__from); | |
447 | __cfrom = reinterpret_cast<char*>(__cfixed); | |
825bd0e1 | 448 | __conv = __iconv_adaptor(iconv, __desc, &__cfrom, |
33590f13 BK |
449 | &__flen, &__cto, &__tlen); |
450 | } | |
451 | ||
452 | ||
453 | if (__conv != size_t(-1)) | |
454 | { | |
455 | __from_next = reinterpret_cast<const extern_type*>(__cfrom); | |
456 | __to_next = reinterpret_cast<intern_type*>(__cto); | |
8fbc5ae7 | 457 | __ret = codecvt_base::ok; |
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458 | } |
459 | else | |
460 | { | |
461 | if (__flen < static_cast<size_t>(__from_end - __from)) | |
462 | { | |
463 | __from_next = reinterpret_cast<const extern_type*>(__cfrom); | |
464 | __to_next = reinterpret_cast<intern_type*>(__cto); | |
8fbc5ae7 | 465 | __ret = codecvt_base::partial; |
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466 | } |
467 | else | |
8fbc5ae7 | 468 | __ret = codecvt_base::error; |
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469 | } |
470 | } | |
471 | return __ret; | |
472 | } | |
473 | ||
474 | template<typename _InternT, typename _ExternT> | |
475 | int | |
825bd0e1 | 476 | codecvt<_InternT, _ExternT, encoding_state>:: |
33590f13 | 477 | do_encoding() const throw() |
07814743 BK |
478 | { |
479 | int __ret = 0; | |
480 | if (sizeof(_ExternT) <= sizeof(_InternT)) | |
825bd0e1 | 481 | __ret = sizeof(_InternT) / sizeof(_ExternT); |
07814743 BK |
482 | return __ret; |
483 | } | |
33590f13 BK |
484 | |
485 | template<typename _InternT, typename _ExternT> | |
486 | bool | |
825bd0e1 | 487 | codecvt<_InternT, _ExternT, encoding_state>:: |
33590f13 BK |
488 | do_always_noconv() const throw() |
489 | { return false; } | |
490 | ||
491 | template<typename _InternT, typename _ExternT> | |
492 | int | |
825bd0e1 | 493 | codecvt<_InternT, _ExternT, encoding_state>:: |
e61c8e23 | 494 | do_length(state_type&, const extern_type* __from, |
33590f13 | 495 | const extern_type* __end, size_t __max) const |
4977bab6 | 496 | { return std::min(__max, static_cast<size_t>(__end - __from)); } |
33590f13 | 497 | |
f5677b15 PC |
498 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
499 | // 74. Garbled text for codecvt::do_max_length | |
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500 | template<typename _InternT, typename _ExternT> |
501 | int | |
825bd0e1 | 502 | codecvt<_InternT, _ExternT, encoding_state>:: |
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503 | do_max_length() const throw() |
504 | { return 1; } | |
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505 | |
506 | _GLIBCXX_END_NAMESPACE | |
f5677b15 | 507 | |
6ab63942 | 508 | #endif |