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1 | // Locale support (codecvt) -*- C++ -*- |
2 | ||
4ffe6e87 | 3 | // Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 |
825bd0e1 | 4 | // Free Software Foundation, Inc. |
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5 | // |
6 | // This file is part of the GNU ISO C++ Library. This library is free | |
7 | // software; you can redistribute it and/or modify it under the | |
8 | // terms of the GNU General Public License as published by the | |
9 | // Free Software Foundation; either version 2, or (at your option) | |
10 | // any later version. | |
11 | ||
12 | // This library is distributed in the hope that it will be useful, | |
13 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | // GNU General Public License for more details. | |
16 | ||
17 | // You should have received a copy of the GNU General Public License along | |
18 | // with this library; see the file COPYING. If not, write to the Free | |
83f51799 | 19 | // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, |
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20 | // USA. |
21 | ||
22 | // As a special exception, you may use this file as part of a free software | |
23 | // library without restriction. Specifically, if other files instantiate | |
24 | // templates or use macros or inline functions from this file, or you compile | |
25 | // this file and link it with other files to produce an executable, this | |
26 | // file does not by itself cause the resulting executable to be covered by | |
27 | // the GNU General Public License. This exception does not however | |
28 | // invalidate any other reasons why the executable file might be covered by | |
29 | // the GNU General Public License. | |
30 | ||
31 | // | |
32 | // ISO C++ 14882: 22.2.1.5 Template class codecvt | |
33 | // | |
34 | ||
825bd0e1 | 35 | // Written by Benjamin Kosnik <bkoz@redhat.com> |
33590f13 | 36 | |
6ab63942 | 37 | /** @file ext/codecvt_specializations.h |
825bd0e1 | 38 | * This file is a GNU extension to the Standard C++ Library. |
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39 | */ |
40 | ||
6ab63942 PC |
41 | #ifndef _EXT_CODECVT_SPECIALIZATIONS_H |
42 | #define _EXT_CODECVT_SPECIALIZATIONS_H 1 | |
43 | ||
d5fa9a0d | 44 | #include <bits/c++config.h> |
6ab63942 PC |
45 | #include <locale> |
46 | #include <iconv.h> | |
47 | ||
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48 | _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) |
49 | ||
939759fc | 50 | /// Extension to use iconv for dealing with character encodings. |
6309eefc | 51 | // This includes conversions and comparisons between various character |
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52 | // sets. This object encapsulates data that may need to be shared between |
53 | // char_traits, codecvt and ctype. | |
825bd0e1 | 54 | class encoding_state |
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55 | { |
56 | public: | |
57 | // Types: | |
58 | // NB: A conversion descriptor subsumes and enhances the | |
59 | // functionality of a simple state type such as mbstate_t. | |
825bd0e1 | 60 | typedef iconv_t descriptor_type; |
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61 | |
62 | protected: | |
33590f13 | 63 | // Name of internal character set encoding. |
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64 | std::string _M_int_enc; |
65 | ||
33590f13 | 66 | // Name of external character set encoding. |
825bd0e1 | 67 | std::string _M_ext_enc; |
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68 | |
69 | // Conversion descriptor between external encoding to internal encoding. | |
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70 | descriptor_type _M_in_desc; |
71 | ||
33590f13 | 72 | // Conversion descriptor between internal encoding to external encoding. |
825bd0e1 | 73 | descriptor_type _M_out_desc; |
33590f13 | 74 | |
825bd0e1 | 75 | // The byte-order marker for the external encoding, if necessary. |
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76 | int _M_ext_bom; |
77 | ||
825bd0e1 | 78 | // The byte-order marker for the internal encoding, if necessary. |
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79 | int _M_int_bom; |
80 | ||
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81 | // Number of external bytes needed to construct one complete |
82 | // character in the internal encoding. | |
83 | // NB: -1 indicates variable, or stateful, encodings. | |
84 | int _M_bytes; | |
6f48900c | 85 | |
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86 | public: |
87 | explicit | |
88 | encoding_state() | |
89 | : _M_in_desc(0), _M_out_desc(0), _M_ext_bom(0), _M_int_bom(0), _M_bytes(0) | |
90 | { } | |
91 | ||
92 | explicit | |
93 | encoding_state(const char* __int, const char* __ext, | |
94 | int __ibom = 0, int __ebom = 0, int __bytes = 1) | |
95 | : _M_int_enc(__int), _M_ext_enc(__ext), _M_in_desc(0), _M_out_desc(0), | |
96 | _M_ext_bom(__ebom), _M_int_bom(__ibom), _M_bytes(__bytes) | |
97 | { init(); } | |
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98 | |
99 | // 21.1.2 traits typedefs | |
100 | // p4 | |
101 | // typedef STATE_T state_type | |
102 | // requires: state_type shall meet the requirements of | |
103 | // CopyConstructible types (20.1.3) | |
28dac70a | 104 | // NB: This does not preserve the actual state of the conversion |
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105 | // descriptor member, but it does duplicate the encoding |
106 | // information. | |
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107 | encoding_state(const encoding_state& __obj) : _M_in_desc(0), _M_out_desc(0) |
108 | { construct(__obj); } | |
33590f13 | 109 | |
6f48900c | 110 | // Need assignment operator as well. |
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111 | encoding_state& |
112 | operator=(const encoding_state& __obj) | |
6f48900c | 113 | { |
825bd0e1 | 114 | construct(__obj); |
7aacf989 | 115 | return *this; |
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116 | } |
117 | ||
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118 | ~encoding_state() |
119 | { destroy(); } | |
33590f13 | 120 | |
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121 | bool |
122 | good() const throw() | |
123 | { | |
5f232232 | 124 | const descriptor_type __err = (iconv_t)(-1); |
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125 | bool __test = _M_in_desc && _M_in_desc != __err; |
126 | __test &= _M_out_desc && _M_out_desc != __err; | |
127 | return __test; | |
128 | } | |
129 | ||
130 | int | |
131 | character_ratio() const | |
132 | { return _M_bytes; } | |
133 | ||
134 | const std::string | |
135 | internal_encoding() const | |
136 | { return _M_int_enc; } | |
137 | ||
138 | int | |
139 | internal_bom() const | |
140 | { return _M_int_bom; } | |
141 | ||
142 | const std::string | |
143 | external_encoding() const | |
144 | { return _M_ext_enc; } | |
145 | ||
146 | int | |
147 | external_bom() const | |
148 | { return _M_ext_bom; } | |
149 | ||
150 | const descriptor_type& | |
151 | in_descriptor() const | |
152 | { return _M_in_desc; } | |
153 | ||
154 | const descriptor_type& | |
155 | out_descriptor() const | |
156 | { return _M_out_desc; } | |
157 | ||
158 | protected: | |
33590f13 | 159 | void |
825bd0e1 | 160 | init() |
33590f13 | 161 | { |
5f232232 | 162 | const descriptor_type __err = (iconv_t)(-1); |
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163 | const bool __have_encodings = _M_int_enc.size() && _M_ext_enc.size(); |
164 | if (!_M_in_desc && __have_encodings) | |
6f48900c | 165 | { |
825bd0e1 | 166 | _M_in_desc = iconv_open(_M_int_enc.c_str(), _M_ext_enc.c_str()); |
6f48900c | 167 | if (_M_in_desc == __err) |
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168 | std::__throw_runtime_error(__N("encoding_state::_M_init " |
169 | "creating iconv input descriptor failed")); | |
6f48900c | 170 | } |
825bd0e1 | 171 | if (!_M_out_desc && __have_encodings) |
6f48900c | 172 | { |
825bd0e1 | 173 | _M_out_desc = iconv_open(_M_ext_enc.c_str(), _M_int_enc.c_str()); |
6f48900c | 174 | if (_M_out_desc == __err) |
825bd0e1 | 175 | std::__throw_runtime_error(__N("encoding_state::_M_init " |
ba9119ec | 176 | "creating iconv output descriptor failed")); |
6f48900c | 177 | } |
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178 | } |
179 | ||
a5f105b5 | 180 | void |
825bd0e1 | 181 | construct(const encoding_state& __obj) |
a5f105b5 | 182 | { |
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183 | destroy(); |
184 | _M_int_enc = __obj._M_int_enc; | |
185 | _M_ext_enc = __obj._M_ext_enc; | |
186 | _M_ext_bom = __obj._M_ext_bom; | |
187 | _M_int_bom = __obj._M_int_bom; | |
188 | _M_bytes = __obj._M_bytes; | |
189 | init(); | |
190 | } | |
191 | ||
192 | void | |
193 | destroy() throw() | |
194 | { | |
5f232232 | 195 | const descriptor_type __err = (iconv_t)(-1); |
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196 | if (_M_in_desc && _M_in_desc != __err) |
197 | { | |
198 | iconv_close(_M_in_desc); | |
199 | _M_in_desc = 0; | |
200 | } | |
201 | if (_M_out_desc && _M_out_desc != __err) | |
202 | { | |
203 | iconv_close(_M_out_desc); | |
204 | _M_out_desc = 0; | |
205 | } | |
206 | } | |
825bd0e1 | 207 | }; |
a5f105b5 | 208 | |
939759fc | 209 | /// encoding_char_traits |
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210 | // Custom traits type with encoding_state for the state type, and the |
211 | // associated fpos<encoding_state> for the position type, all other | |
212 | // bits equivalent to the required char_traits instantiations. | |
213 | template<typename _CharT> | |
214 | struct encoding_char_traits : public std::char_traits<_CharT> | |
215 | { | |
216 | typedef encoding_state state_type; | |
217 | typedef typename std::fpos<state_type> pos_type; | |
218 | }; | |
6f48900c | 219 | |
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220 | _GLIBCXX_END_NAMESPACE |
221 | ||
222 | ||
223 | _GLIBCXX_BEGIN_NAMESPACE(std) | |
224 | ||
825bd0e1 | 225 | using __gnu_cxx::encoding_state; |
33590f13 | 226 | |
939759fc | 227 | /// codecvt<InternT, _ExternT, encoding_state> specialization. |
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228 | // This partial specialization takes advantage of iconv to provide |
229 | // code conversions between a large number of character encodings. | |
33590f13 | 230 | template<typename _InternT, typename _ExternT> |
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231 | class codecvt<_InternT, _ExternT, encoding_state> |
232 | : public __codecvt_abstract_base<_InternT, _ExternT, encoding_state> | |
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233 | { |
234 | public: | |
235 | // Types: | |
236 | typedef codecvt_base::result result; | |
237 | typedef _InternT intern_type; | |
238 | typedef _ExternT extern_type; | |
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239 | typedef __gnu_cxx::encoding_state state_type; |
240 | typedef state_type::descriptor_type descriptor_type; | |
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241 | |
242 | // Data Members: | |
243 | static locale::id id; | |
244 | ||
245 | explicit | |
246 | codecvt(size_t __refs = 0) | |
247 | : __codecvt_abstract_base<intern_type, extern_type, state_type>(__refs) | |
248 | { } | |
249 | ||
250 | explicit | |
825bd0e1 | 251 | codecvt(state_type& __enc, size_t __refs = 0) |
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252 | : __codecvt_abstract_base<intern_type, extern_type, state_type>(__refs) |
253 | { } | |
254 | ||
825bd0e1 | 255 | protected: |
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256 | virtual |
257 | ~codecvt() { } | |
258 | ||
259 | virtual result | |
260 | do_out(state_type& __state, const intern_type* __from, | |
261 | const intern_type* __from_end, const intern_type*& __from_next, | |
262 | extern_type* __to, extern_type* __to_end, | |
263 | extern_type*& __to_next) const; | |
264 | ||
265 | virtual result | |
266 | do_unshift(state_type& __state, extern_type* __to, | |
267 | extern_type* __to_end, extern_type*& __to_next) const; | |
268 | ||
269 | virtual result | |
270 | do_in(state_type& __state, const extern_type* __from, | |
271 | const extern_type* __from_end, const extern_type*& __from_next, | |
272 | intern_type* __to, intern_type* __to_end, | |
273 | intern_type*& __to_next) const; | |
274 | ||
275 | virtual int | |
276 | do_encoding() const throw(); | |
277 | ||
278 | virtual bool | |
279 | do_always_noconv() const throw(); | |
280 | ||
281 | virtual int | |
e61c8e23 | 282 | do_length(state_type&, const extern_type* __from, |
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283 | const extern_type* __end, size_t __max) const; |
284 | ||
285 | virtual int | |
286 | do_max_length() const throw(); | |
287 | }; | |
288 | ||
289 | template<typename _InternT, typename _ExternT> | |
290 | locale::id | |
825bd0e1 | 291 | codecvt<_InternT, _ExternT, encoding_state>::id; |
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292 | |
293 | // This adaptor works around the signature problems of the second | |
294 | // argument to iconv(): SUSv2 and others use 'const char**', but glibc 2.2 | |
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295 | // uses 'char**', which matches the POSIX 1003.1-2001 standard. |
296 | // Using this adaptor, g++ will do the work for us. | |
bd11bebe | 297 | template<typename _Tp> |
33590f13 | 298 | inline size_t |
bd11bebe | 299 | __iconv_adaptor(size_t(*__func)(iconv_t, _Tp, size_t*, char**, size_t*), |
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300 | iconv_t __cd, char** __inbuf, size_t* __inbytes, |
301 | char** __outbuf, size_t* __outbytes) | |
bd11bebe | 302 | { return __func(__cd, (_Tp)__inbuf, __inbytes, __outbuf, __outbytes); } |
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303 | |
304 | template<typename _InternT, typename _ExternT> | |
305 | codecvt_base::result | |
825bd0e1 | 306 | codecvt<_InternT, _ExternT, encoding_state>:: |
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307 | do_out(state_type& __state, const intern_type* __from, |
308 | const intern_type* __from_end, const intern_type*& __from_next, | |
309 | extern_type* __to, extern_type* __to_end, | |
310 | extern_type*& __to_next) const | |
311 | { | |
8fbc5ae7 | 312 | result __ret = codecvt_base::error; |
825bd0e1 | 313 | if (__state.good()) |
33590f13 | 314 | { |
825bd0e1 | 315 | const descriptor_type& __desc = __state.out_descriptor(); |
99b629fa | 316 | const size_t __fmultiple = sizeof(intern_type); |
07814743 | 317 | size_t __fbytes = __fmultiple * (__from_end - __from); |
99b629fa | 318 | const size_t __tmultiple = sizeof(extern_type); |
07814743 | 319 | size_t __tbytes = __tmultiple * (__to_end - __to); |
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320 | |
321 | // Argument list for iconv specifies a byte sequence. Thus, | |
322 | // all to/from arrays must be brutally casted to char*. | |
323 | char* __cto = reinterpret_cast<char*>(__to); | |
324 | char* __cfrom; | |
325 | size_t __conv; | |
326 | ||
327 | // Some encodings need a byte order marker as the first item | |
328 | // in the byte stream, to designate endian-ness. The default | |
329 | // value for the byte order marker is NULL, so if this is | |
330 | // the case, it's not necessary and we can just go on our | |
331 | // merry way. | |
825bd0e1 | 332 | int __int_bom = __state.internal_bom(); |
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333 | if (__int_bom) |
334 | { | |
335 | size_t __size = __from_end - __from; | |
e76382b5 VR |
336 | intern_type* __cfixed = static_cast<intern_type*> |
337 | (__builtin_alloca(sizeof(intern_type) * (__size + 1))); | |
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338 | __cfixed[0] = static_cast<intern_type>(__int_bom); |
339 | char_traits<intern_type>::copy(__cfixed + 1, __from, __size); | |
340 | __cfrom = reinterpret_cast<char*>(__cfixed); | |
825bd0e1 | 341 | __conv = __iconv_adaptor(iconv, __desc, &__cfrom, |
07814743 | 342 | &__fbytes, &__cto, &__tbytes); |
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343 | } |
344 | else | |
345 | { | |
346 | intern_type* __cfixed = const_cast<intern_type*>(__from); | |
347 | __cfrom = reinterpret_cast<char*>(__cfixed); | |
825bd0e1 | 348 | __conv = __iconv_adaptor(iconv, __desc, &__cfrom, &__fbytes, |
07814743 | 349 | &__cto, &__tbytes); |
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350 | } |
351 | ||
352 | if (__conv != size_t(-1)) | |
353 | { | |
354 | __from_next = reinterpret_cast<const intern_type*>(__cfrom); | |
355 | __to_next = reinterpret_cast<extern_type*>(__cto); | |
8fbc5ae7 | 356 | __ret = codecvt_base::ok; |
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357 | } |
358 | else | |
359 | { | |
07814743 | 360 | if (__fbytes < __fmultiple * (__from_end - __from)) |
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361 | { |
362 | __from_next = reinterpret_cast<const intern_type*>(__cfrom); | |
363 | __to_next = reinterpret_cast<extern_type*>(__cto); | |
8fbc5ae7 | 364 | __ret = codecvt_base::partial; |
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365 | } |
366 | else | |
8fbc5ae7 | 367 | __ret = codecvt_base::error; |
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368 | } |
369 | } | |
370 | return __ret; | |
371 | } | |
372 | ||
373 | template<typename _InternT, typename _ExternT> | |
374 | codecvt_base::result | |
825bd0e1 | 375 | codecvt<_InternT, _ExternT, encoding_state>:: |
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376 | do_unshift(state_type& __state, extern_type* __to, |
377 | extern_type* __to_end, extern_type*& __to_next) const | |
378 | { | |
8fbc5ae7 | 379 | result __ret = codecvt_base::error; |
825bd0e1 | 380 | if (__state.good()) |
33590f13 | 381 | { |
825bd0e1 | 382 | const descriptor_type& __desc = __state.in_descriptor(); |
99b629fa | 383 | const size_t __tmultiple = sizeof(intern_type); |
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384 | size_t __tlen = __tmultiple * (__to_end - __to); |
385 | ||
386 | // Argument list for iconv specifies a byte sequence. Thus, | |
387 | // all to/from arrays must be brutally casted to char*. | |
388 | char* __cto = reinterpret_cast<char*>(__to); | |
825bd0e1 | 389 | size_t __conv = __iconv_adaptor(iconv,__desc, NULL, NULL, |
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390 | &__cto, &__tlen); |
391 | ||
392 | if (__conv != size_t(-1)) | |
393 | { | |
394 | __to_next = reinterpret_cast<extern_type*>(__cto); | |
395 | if (__tlen == __tmultiple * (__to_end - __to)) | |
8fbc5ae7 | 396 | __ret = codecvt_base::noconv; |
33590f13 | 397 | else if (__tlen == 0) |
8fbc5ae7 | 398 | __ret = codecvt_base::ok; |
33590f13 | 399 | else |
8fbc5ae7 | 400 | __ret = codecvt_base::partial; |
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401 | } |
402 | else | |
8fbc5ae7 | 403 | __ret = codecvt_base::error; |
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404 | } |
405 | return __ret; | |
406 | } | |
407 | ||
408 | template<typename _InternT, typename _ExternT> | |
409 | codecvt_base::result | |
825bd0e1 | 410 | codecvt<_InternT, _ExternT, encoding_state>:: |
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411 | do_in(state_type& __state, const extern_type* __from, |
412 | const extern_type* __from_end, const extern_type*& __from_next, | |
413 | intern_type* __to, intern_type* __to_end, | |
414 | intern_type*& __to_next) const | |
415 | { | |
8fbc5ae7 | 416 | result __ret = codecvt_base::error; |
825bd0e1 | 417 | if (__state.good()) |
33590f13 | 418 | { |
825bd0e1 | 419 | const descriptor_type& __desc = __state.in_descriptor(); |
99b629fa | 420 | const size_t __fmultiple = sizeof(extern_type); |
33590f13 | 421 | size_t __flen = __fmultiple * (__from_end - __from); |
99b629fa | 422 | const size_t __tmultiple = sizeof(intern_type); |
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423 | size_t __tlen = __tmultiple * (__to_end - __to); |
424 | ||
425 | // Argument list for iconv specifies a byte sequence. Thus, | |
426 | // all to/from arrays must be brutally casted to char*. | |
427 | char* __cto = reinterpret_cast<char*>(__to); | |
428 | char* __cfrom; | |
429 | size_t __conv; | |
430 | ||
431 | // Some encodings need a byte order marker as the first item | |
432 | // in the byte stream, to designate endian-ness. The default | |
433 | // value for the byte order marker is NULL, so if this is | |
434 | // the case, it's not necessary and we can just go on our | |
435 | // merry way. | |
825bd0e1 | 436 | int __ext_bom = __state.external_bom(); |
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437 | if (__ext_bom) |
438 | { | |
439 | size_t __size = __from_end - __from; | |
e76382b5 VR |
440 | extern_type* __cfixed = static_cast<extern_type*> |
441 | (__builtin_alloca(sizeof(extern_type) * (__size + 1))); | |
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442 | __cfixed[0] = static_cast<extern_type>(__ext_bom); |
443 | char_traits<extern_type>::copy(__cfixed + 1, __from, __size); | |
444 | __cfrom = reinterpret_cast<char*>(__cfixed); | |
825bd0e1 | 445 | __conv = __iconv_adaptor(iconv, __desc, &__cfrom, |
33590f13 BK |
446 | &__flen, &__cto, &__tlen); |
447 | } | |
448 | else | |
449 | { | |
450 | extern_type* __cfixed = const_cast<extern_type*>(__from); | |
451 | __cfrom = reinterpret_cast<char*>(__cfixed); | |
825bd0e1 | 452 | __conv = __iconv_adaptor(iconv, __desc, &__cfrom, |
33590f13 BK |
453 | &__flen, &__cto, &__tlen); |
454 | } | |
455 | ||
456 | ||
457 | if (__conv != size_t(-1)) | |
458 | { | |
459 | __from_next = reinterpret_cast<const extern_type*>(__cfrom); | |
460 | __to_next = reinterpret_cast<intern_type*>(__cto); | |
8fbc5ae7 | 461 | __ret = codecvt_base::ok; |
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462 | } |
463 | else | |
464 | { | |
465 | if (__flen < static_cast<size_t>(__from_end - __from)) | |
466 | { | |
467 | __from_next = reinterpret_cast<const extern_type*>(__cfrom); | |
468 | __to_next = reinterpret_cast<intern_type*>(__cto); | |
8fbc5ae7 | 469 | __ret = codecvt_base::partial; |
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470 | } |
471 | else | |
8fbc5ae7 | 472 | __ret = codecvt_base::error; |
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473 | } |
474 | } | |
475 | return __ret; | |
476 | } | |
477 | ||
478 | template<typename _InternT, typename _ExternT> | |
479 | int | |
825bd0e1 | 480 | codecvt<_InternT, _ExternT, encoding_state>:: |
33590f13 | 481 | do_encoding() const throw() |
07814743 BK |
482 | { |
483 | int __ret = 0; | |
484 | if (sizeof(_ExternT) <= sizeof(_InternT)) | |
825bd0e1 | 485 | __ret = sizeof(_InternT) / sizeof(_ExternT); |
07814743 BK |
486 | return __ret; |
487 | } | |
33590f13 BK |
488 | |
489 | template<typename _InternT, typename _ExternT> | |
490 | bool | |
825bd0e1 | 491 | codecvt<_InternT, _ExternT, encoding_state>:: |
33590f13 BK |
492 | do_always_noconv() const throw() |
493 | { return false; } | |
494 | ||
495 | template<typename _InternT, typename _ExternT> | |
496 | int | |
825bd0e1 | 497 | codecvt<_InternT, _ExternT, encoding_state>:: |
e61c8e23 | 498 | do_length(state_type&, const extern_type* __from, |
33590f13 | 499 | const extern_type* __end, size_t __max) const |
4977bab6 | 500 | { return std::min(__max, static_cast<size_t>(__end - __from)); } |
33590f13 | 501 | |
f5677b15 PC |
502 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
503 | // 74. Garbled text for codecvt::do_max_length | |
33590f13 BK |
504 | template<typename _InternT, typename _ExternT> |
505 | int | |
825bd0e1 | 506 | codecvt<_InternT, _ExternT, encoding_state>:: |
33590f13 BK |
507 | do_max_length() const throw() |
508 | { return 1; } | |
3cbc7af0 BK |
509 | |
510 | _GLIBCXX_END_NAMESPACE | |
f5677b15 | 511 | |
6ab63942 | 512 | #endif |