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1 | // Locale support (codecvt) -*- C++ -*- |
2 | ||
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3 | // Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005 |
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 | |
00aca6e8 | 37 | /** @file bits/codecvt_specializations.h |
825bd0e1 | 38 | * This file is a GNU extension to the Standard C++ Library. |
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39 | */ |
40 | ||
6f48900c | 41 | // XXX |
691d0896 | 42 | // Define this here so codecvt.cc can have _S_max_size definition. |
825bd0e1 | 43 | #define _GLIBCXX_USE_ENCODING_STATE 1 |
33590f13 | 44 | |
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45 | _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) |
46 | ||
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47 | /// @brief Extension to use icov for dealing with character encodings. |
48 | // This includes conversions and comparisons between various character | |
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49 | // sets. This object encapsulates data that may need to be shared between |
50 | // char_traits, codecvt and ctype. | |
825bd0e1 | 51 | class encoding_state |
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52 | { |
53 | public: | |
54 | // Types: | |
55 | // NB: A conversion descriptor subsumes and enhances the | |
56 | // functionality of a simple state type such as mbstate_t. | |
825bd0e1 | 57 | typedef iconv_t descriptor_type; |
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58 | |
59 | protected: | |
33590f13 | 60 | // Name of internal character set encoding. |
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61 | std::string _M_int_enc; |
62 | ||
33590f13 | 63 | // Name of external character set encoding. |
825bd0e1 | 64 | std::string _M_ext_enc; |
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65 | |
66 | // Conversion descriptor between external encoding to internal encoding. | |
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67 | descriptor_type _M_in_desc; |
68 | ||
33590f13 | 69 | // Conversion descriptor between internal encoding to external encoding. |
825bd0e1 | 70 | descriptor_type _M_out_desc; |
33590f13 | 71 | |
825bd0e1 | 72 | // The byte-order marker for the external encoding, if necessary. |
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73 | int _M_ext_bom; |
74 | ||
825bd0e1 | 75 | // The byte-order marker for the internal encoding, if necessary. |
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76 | int _M_int_bom; |
77 | ||
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78 | // Number of external bytes needed to construct one complete |
79 | // character in the internal encoding. | |
80 | // NB: -1 indicates variable, or stateful, encodings. | |
81 | int _M_bytes; | |
6f48900c | 82 | |
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83 | public: |
84 | explicit | |
85 | encoding_state() | |
86 | : _M_in_desc(0), _M_out_desc(0), _M_ext_bom(0), _M_int_bom(0), _M_bytes(0) | |
87 | { } | |
88 | ||
89 | explicit | |
90 | encoding_state(const char* __int, const char* __ext, | |
91 | int __ibom = 0, int __ebom = 0, int __bytes = 1) | |
92 | : _M_int_enc(__int), _M_ext_enc(__ext), _M_in_desc(0), _M_out_desc(0), | |
93 | _M_ext_bom(__ebom), _M_int_bom(__ibom), _M_bytes(__bytes) | |
94 | { init(); } | |
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95 | |
96 | // 21.1.2 traits typedefs | |
97 | // p4 | |
98 | // typedef STATE_T state_type | |
99 | // requires: state_type shall meet the requirements of | |
100 | // CopyConstructible types (20.1.3) | |
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101 | // NB: This does not preseve the actual state of the conversion |
102 | // descriptor member, but it does duplicate the encoding | |
103 | // information. | |
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104 | encoding_state(const encoding_state& __obj) : _M_in_desc(0), _M_out_desc(0) |
105 | { construct(__obj); } | |
33590f13 | 106 | |
6f48900c | 107 | // Need assignment operator as well. |
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108 | encoding_state& |
109 | operator=(const encoding_state& __obj) | |
6f48900c | 110 | { |
825bd0e1 | 111 | construct(__obj); |
7aacf989 | 112 | return *this; |
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113 | } |
114 | ||
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115 | ~encoding_state() |
116 | { destroy(); } | |
33590f13 | 117 | |
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118 | bool |
119 | good() const throw() | |
120 | { | |
121 | const descriptor_type __err = reinterpret_cast<iconv_t>(-1); | |
122 | bool __test = _M_in_desc && _M_in_desc != __err; | |
123 | __test &= _M_out_desc && _M_out_desc != __err; | |
124 | return __test; | |
125 | } | |
126 | ||
127 | int | |
128 | character_ratio() const | |
129 | { return _M_bytes; } | |
130 | ||
131 | const std::string | |
132 | internal_encoding() const | |
133 | { return _M_int_enc; } | |
134 | ||
135 | int | |
136 | internal_bom() const | |
137 | { return _M_int_bom; } | |
138 | ||
139 | const std::string | |
140 | external_encoding() const | |
141 | { return _M_ext_enc; } | |
142 | ||
143 | int | |
144 | external_bom() const | |
145 | { return _M_ext_bom; } | |
146 | ||
147 | const descriptor_type& | |
148 | in_descriptor() const | |
149 | { return _M_in_desc; } | |
150 | ||
151 | const descriptor_type& | |
152 | out_descriptor() const | |
153 | { return _M_out_desc; } | |
154 | ||
155 | protected: | |
33590f13 | 156 | void |
825bd0e1 | 157 | init() |
33590f13 | 158 | { |
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159 | const descriptor_type __err = reinterpret_cast<iconv_t>(-1); |
160 | const bool __have_encodings = _M_int_enc.size() && _M_ext_enc.size(); | |
161 | if (!_M_in_desc && __have_encodings) | |
6f48900c | 162 | { |
825bd0e1 | 163 | _M_in_desc = iconv_open(_M_int_enc.c_str(), _M_ext_enc.c_str()); |
6f48900c | 164 | if (_M_in_desc == __err) |
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165 | std::__throw_runtime_error(__N("encoding_state::_M_init " |
166 | "creating iconv input descriptor failed")); | |
6f48900c | 167 | } |
825bd0e1 | 168 | if (!_M_out_desc && __have_encodings) |
6f48900c | 169 | { |
825bd0e1 | 170 | _M_out_desc = iconv_open(_M_ext_enc.c_str(), _M_int_enc.c_str()); |
6f48900c | 171 | if (_M_out_desc == __err) |
825bd0e1 | 172 | std::__throw_runtime_error(__N("encoding_state::_M_init " |
ba9119ec | 173 | "creating iconv output descriptor failed")); |
6f48900c | 174 | } |
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175 | } |
176 | ||
a5f105b5 | 177 | void |
825bd0e1 | 178 | construct(const encoding_state& __obj) |
a5f105b5 | 179 | { |
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180 | destroy(); |
181 | _M_int_enc = __obj._M_int_enc; | |
182 | _M_ext_enc = __obj._M_ext_enc; | |
183 | _M_ext_bom = __obj._M_ext_bom; | |
184 | _M_int_bom = __obj._M_int_bom; | |
185 | _M_bytes = __obj._M_bytes; | |
186 | init(); | |
187 | } | |
188 | ||
189 | void | |
190 | destroy() throw() | |
191 | { | |
192 | const descriptor_type __err = reinterpret_cast<iconv_t>(-1); | |
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193 | if (_M_in_desc && _M_in_desc != __err) |
194 | { | |
195 | iconv_close(_M_in_desc); | |
196 | _M_in_desc = 0; | |
197 | } | |
198 | if (_M_out_desc && _M_out_desc != __err) | |
199 | { | |
200 | iconv_close(_M_out_desc); | |
201 | _M_out_desc = 0; | |
202 | } | |
203 | } | |
825bd0e1 | 204 | }; |
a5f105b5 | 205 | |
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206 | /// @brief encoding_char_traits. |
207 | // Custom traits type with encoding_state for the state type, and the | |
208 | // associated fpos<encoding_state> for the position type, all other | |
209 | // bits equivalent to the required char_traits instantiations. | |
210 | template<typename _CharT> | |
211 | struct encoding_char_traits : public std::char_traits<_CharT> | |
212 | { | |
213 | typedef encoding_state state_type; | |
214 | typedef typename std::fpos<state_type> pos_type; | |
215 | }; | |
6f48900c | 216 | |
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217 | _GLIBCXX_END_NAMESPACE |
218 | ||
219 | ||
220 | _GLIBCXX_BEGIN_NAMESPACE(std) | |
221 | ||
825bd0e1 | 222 | using __gnu_cxx::encoding_state; |
33590f13 | 223 | |
825bd0e1 | 224 | /// @brief codecvt<InternT, _ExternT, encoding_state> specialization. |
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225 | // This partial specialization takes advantage of iconv to provide |
226 | // code conversions between a large number of character encodings. | |
33590f13 | 227 | template<typename _InternT, typename _ExternT> |
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228 | class codecvt<_InternT, _ExternT, encoding_state> |
229 | : public __codecvt_abstract_base<_InternT, _ExternT, encoding_state> | |
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230 | { |
231 | public: | |
232 | // Types: | |
233 | typedef codecvt_base::result result; | |
234 | typedef _InternT intern_type; | |
235 | typedef _ExternT extern_type; | |
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236 | typedef __gnu_cxx::encoding_state state_type; |
237 | typedef state_type::descriptor_type descriptor_type; | |
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238 | |
239 | // Data Members: | |
240 | static locale::id id; | |
241 | ||
242 | explicit | |
243 | codecvt(size_t __refs = 0) | |
244 | : __codecvt_abstract_base<intern_type, extern_type, state_type>(__refs) | |
245 | { } | |
246 | ||
247 | explicit | |
825bd0e1 | 248 | codecvt(state_type& __enc, size_t __refs = 0) |
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249 | : __codecvt_abstract_base<intern_type, extern_type, state_type>(__refs) |
250 | { } | |
251 | ||
825bd0e1 | 252 | protected: |
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253 | virtual |
254 | ~codecvt() { } | |
255 | ||
256 | virtual result | |
257 | do_out(state_type& __state, const intern_type* __from, | |
258 | const intern_type* __from_end, const intern_type*& __from_next, | |
259 | extern_type* __to, extern_type* __to_end, | |
260 | extern_type*& __to_next) const; | |
261 | ||
262 | virtual result | |
263 | do_unshift(state_type& __state, extern_type* __to, | |
264 | extern_type* __to_end, extern_type*& __to_next) const; | |
265 | ||
266 | virtual result | |
267 | do_in(state_type& __state, const extern_type* __from, | |
268 | const extern_type* __from_end, const extern_type*& __from_next, | |
269 | intern_type* __to, intern_type* __to_end, | |
270 | intern_type*& __to_next) const; | |
271 | ||
272 | virtual int | |
273 | do_encoding() const throw(); | |
274 | ||
275 | virtual bool | |
276 | do_always_noconv() const throw(); | |
277 | ||
278 | virtual int | |
e61c8e23 | 279 | do_length(state_type&, const extern_type* __from, |
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280 | const extern_type* __end, size_t __max) const; |
281 | ||
282 | virtual int | |
283 | do_max_length() const throw(); | |
284 | }; | |
285 | ||
286 | template<typename _InternT, typename _ExternT> | |
287 | locale::id | |
825bd0e1 | 288 | codecvt<_InternT, _ExternT, encoding_state>::id; |
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289 | |
290 | // This adaptor works around the signature problems of the second | |
291 | // argument to iconv(): SUSv2 and others use 'const char**', but glibc 2.2 | |
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292 | // uses 'char**', which matches the POSIX 1003.1-2001 standard. |
293 | // Using this adaptor, g++ will do the work for us. | |
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294 | template<typename _T> |
295 | inline size_t | |
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296 | __iconv_adaptor(size_t(*__func)(iconv_t, _T, size_t*, char**, size_t*), |
297 | iconv_t __cd, char** __inbuf, size_t* __inbytes, | |
298 | char** __outbuf, size_t* __outbytes) | |
299 | { return __func(__cd, (_T)__inbuf, __inbytes, __outbuf, __outbytes); } | |
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300 | |
301 | template<typename _InternT, typename _ExternT> | |
302 | codecvt_base::result | |
825bd0e1 | 303 | codecvt<_InternT, _ExternT, encoding_state>:: |
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304 | do_out(state_type& __state, const intern_type* __from, |
305 | const intern_type* __from_end, const intern_type*& __from_next, | |
306 | extern_type* __to, extern_type* __to_end, | |
307 | extern_type*& __to_next) const | |
308 | { | |
8fbc5ae7 | 309 | result __ret = codecvt_base::error; |
825bd0e1 | 310 | if (__state.good()) |
33590f13 | 311 | { |
825bd0e1 | 312 | const descriptor_type& __desc = __state.out_descriptor(); |
99b629fa | 313 | const size_t __fmultiple = sizeof(intern_type); |
07814743 | 314 | size_t __fbytes = __fmultiple * (__from_end - __from); |
99b629fa | 315 | const size_t __tmultiple = sizeof(extern_type); |
07814743 | 316 | size_t __tbytes = __tmultiple * (__to_end - __to); |
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317 | |
318 | // Argument list for iconv specifies a byte sequence. Thus, | |
319 | // all to/from arrays must be brutally casted to char*. | |
320 | char* __cto = reinterpret_cast<char*>(__to); | |
321 | char* __cfrom; | |
322 | size_t __conv; | |
323 | ||
324 | // Some encodings need a byte order marker as the first item | |
325 | // in the byte stream, to designate endian-ness. The default | |
326 | // value for the byte order marker is NULL, so if this is | |
327 | // the case, it's not necessary and we can just go on our | |
328 | // merry way. | |
825bd0e1 | 329 | int __int_bom = __state.internal_bom(); |
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330 | if (__int_bom) |
331 | { | |
332 | size_t __size = __from_end - __from; | |
e76382b5 VR |
333 | intern_type* __cfixed = static_cast<intern_type*> |
334 | (__builtin_alloca(sizeof(intern_type) * (__size + 1))); | |
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335 | __cfixed[0] = static_cast<intern_type>(__int_bom); |
336 | char_traits<intern_type>::copy(__cfixed + 1, __from, __size); | |
337 | __cfrom = reinterpret_cast<char*>(__cfixed); | |
825bd0e1 | 338 | __conv = __iconv_adaptor(iconv, __desc, &__cfrom, |
07814743 | 339 | &__fbytes, &__cto, &__tbytes); |
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340 | } |
341 | else | |
342 | { | |
343 | intern_type* __cfixed = const_cast<intern_type*>(__from); | |
344 | __cfrom = reinterpret_cast<char*>(__cfixed); | |
825bd0e1 | 345 | __conv = __iconv_adaptor(iconv, __desc, &__cfrom, &__fbytes, |
07814743 | 346 | &__cto, &__tbytes); |
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347 | } |
348 | ||
349 | if (__conv != size_t(-1)) | |
350 | { | |
351 | __from_next = reinterpret_cast<const intern_type*>(__cfrom); | |
352 | __to_next = reinterpret_cast<extern_type*>(__cto); | |
8fbc5ae7 | 353 | __ret = codecvt_base::ok; |
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354 | } |
355 | else | |
356 | { | |
07814743 | 357 | if (__fbytes < __fmultiple * (__from_end - __from)) |
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358 | { |
359 | __from_next = reinterpret_cast<const intern_type*>(__cfrom); | |
360 | __to_next = reinterpret_cast<extern_type*>(__cto); | |
8fbc5ae7 | 361 | __ret = codecvt_base::partial; |
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362 | } |
363 | else | |
8fbc5ae7 | 364 | __ret = codecvt_base::error; |
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365 | } |
366 | } | |
367 | return __ret; | |
368 | } | |
369 | ||
370 | template<typename _InternT, typename _ExternT> | |
371 | codecvt_base::result | |
825bd0e1 | 372 | codecvt<_InternT, _ExternT, encoding_state>:: |
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373 | do_unshift(state_type& __state, extern_type* __to, |
374 | extern_type* __to_end, extern_type*& __to_next) const | |
375 | { | |
8fbc5ae7 | 376 | result __ret = codecvt_base::error; |
825bd0e1 | 377 | if (__state.good()) |
33590f13 | 378 | { |
825bd0e1 | 379 | const descriptor_type& __desc = __state.in_descriptor(); |
99b629fa | 380 | const size_t __tmultiple = sizeof(intern_type); |
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381 | size_t __tlen = __tmultiple * (__to_end - __to); |
382 | ||
383 | // Argument list for iconv specifies a byte sequence. Thus, | |
384 | // all to/from arrays must be brutally casted to char*. | |
385 | char* __cto = reinterpret_cast<char*>(__to); | |
825bd0e1 | 386 | size_t __conv = __iconv_adaptor(iconv,__desc, NULL, NULL, |
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387 | &__cto, &__tlen); |
388 | ||
389 | if (__conv != size_t(-1)) | |
390 | { | |
391 | __to_next = reinterpret_cast<extern_type*>(__cto); | |
392 | if (__tlen == __tmultiple * (__to_end - __to)) | |
8fbc5ae7 | 393 | __ret = codecvt_base::noconv; |
33590f13 | 394 | else if (__tlen == 0) |
8fbc5ae7 | 395 | __ret = codecvt_base::ok; |
33590f13 | 396 | else |
8fbc5ae7 | 397 | __ret = codecvt_base::partial; |
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398 | } |
399 | else | |
8fbc5ae7 | 400 | __ret = codecvt_base::error; |
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401 | } |
402 | return __ret; | |
403 | } | |
404 | ||
405 | template<typename _InternT, typename _ExternT> | |
406 | codecvt_base::result | |
825bd0e1 | 407 | codecvt<_InternT, _ExternT, encoding_state>:: |
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408 | do_in(state_type& __state, const extern_type* __from, |
409 | const extern_type* __from_end, const extern_type*& __from_next, | |
410 | intern_type* __to, intern_type* __to_end, | |
411 | intern_type*& __to_next) const | |
412 | { | |
8fbc5ae7 | 413 | result __ret = codecvt_base::error; |
825bd0e1 | 414 | if (__state.good()) |
33590f13 | 415 | { |
825bd0e1 | 416 | const descriptor_type& __desc = __state.in_descriptor(); |
99b629fa | 417 | const size_t __fmultiple = sizeof(extern_type); |
33590f13 | 418 | size_t __flen = __fmultiple * (__from_end - __from); |
99b629fa | 419 | const size_t __tmultiple = sizeof(intern_type); |
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420 | size_t __tlen = __tmultiple * (__to_end - __to); |
421 | ||
422 | // Argument list for iconv specifies a byte sequence. Thus, | |
423 | // all to/from arrays must be brutally casted to char*. | |
424 | char* __cto = reinterpret_cast<char*>(__to); | |
425 | char* __cfrom; | |
426 | size_t __conv; | |
427 | ||
428 | // Some encodings need a byte order marker as the first item | |
429 | // in the byte stream, to designate endian-ness. The default | |
430 | // value for the byte order marker is NULL, so if this is | |
431 | // the case, it's not necessary and we can just go on our | |
432 | // merry way. | |
825bd0e1 | 433 | int __ext_bom = __state.external_bom(); |
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434 | if (__ext_bom) |
435 | { | |
436 | size_t __size = __from_end - __from; | |
e76382b5 VR |
437 | extern_type* __cfixed = static_cast<extern_type*> |
438 | (__builtin_alloca(sizeof(extern_type) * (__size + 1))); | |
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439 | __cfixed[0] = static_cast<extern_type>(__ext_bom); |
440 | char_traits<extern_type>::copy(__cfixed + 1, __from, __size); | |
441 | __cfrom = reinterpret_cast<char*>(__cfixed); | |
825bd0e1 | 442 | __conv = __iconv_adaptor(iconv, __desc, &__cfrom, |
33590f13 BK |
443 | &__flen, &__cto, &__tlen); |
444 | } | |
445 | else | |
446 | { | |
447 | extern_type* __cfixed = const_cast<extern_type*>(__from); | |
448 | __cfrom = reinterpret_cast<char*>(__cfixed); | |
825bd0e1 | 449 | __conv = __iconv_adaptor(iconv, __desc, &__cfrom, |
33590f13 BK |
450 | &__flen, &__cto, &__tlen); |
451 | } | |
452 | ||
453 | ||
454 | if (__conv != size_t(-1)) | |
455 | { | |
456 | __from_next = reinterpret_cast<const extern_type*>(__cfrom); | |
457 | __to_next = reinterpret_cast<intern_type*>(__cto); | |
8fbc5ae7 | 458 | __ret = codecvt_base::ok; |
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459 | } |
460 | else | |
461 | { | |
462 | if (__flen < static_cast<size_t>(__from_end - __from)) | |
463 | { | |
464 | __from_next = reinterpret_cast<const extern_type*>(__cfrom); | |
465 | __to_next = reinterpret_cast<intern_type*>(__cto); | |
8fbc5ae7 | 466 | __ret = codecvt_base::partial; |
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467 | } |
468 | else | |
8fbc5ae7 | 469 | __ret = codecvt_base::error; |
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470 | } |
471 | } | |
472 | return __ret; | |
473 | } | |
474 | ||
475 | template<typename _InternT, typename _ExternT> | |
476 | int | |
825bd0e1 | 477 | codecvt<_InternT, _ExternT, encoding_state>:: |
33590f13 | 478 | do_encoding() const throw() |
07814743 BK |
479 | { |
480 | int __ret = 0; | |
481 | if (sizeof(_ExternT) <= sizeof(_InternT)) | |
825bd0e1 | 482 | __ret = sizeof(_InternT) / sizeof(_ExternT); |
07814743 BK |
483 | return __ret; |
484 | } | |
33590f13 BK |
485 | |
486 | template<typename _InternT, typename _ExternT> | |
487 | bool | |
825bd0e1 | 488 | codecvt<_InternT, _ExternT, encoding_state>:: |
33590f13 BK |
489 | do_always_noconv() const throw() |
490 | { return false; } | |
491 | ||
492 | template<typename _InternT, typename _ExternT> | |
493 | int | |
825bd0e1 | 494 | codecvt<_InternT, _ExternT, encoding_state>:: |
e61c8e23 | 495 | do_length(state_type&, const extern_type* __from, |
33590f13 | 496 | const extern_type* __end, size_t __max) const |
4977bab6 | 497 | { return std::min(__max, static_cast<size_t>(__end - __from)); } |
33590f13 | 498 | |
f5677b15 PC |
499 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
500 | // 74. Garbled text for codecvt::do_max_length | |
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501 | template<typename _InternT, typename _ExternT> |
502 | int | |
825bd0e1 | 503 | codecvt<_InternT, _ExternT, encoding_state>:: |
33590f13 BK |
504 | do_max_length() const throw() |
505 | { return 1; } | |
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506 | |
507 | _GLIBCXX_END_NAMESPACE | |
f5677b15 | 508 |