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111
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1 // Locale support (codecvt) -*- C++ -*-
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2
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145
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3 // Copyright (C) 2000-2020 Free Software Foundation, Inc.
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111
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4 //
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5 // This file is part of the GNU ISO C++ Library. This library is free
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6 // software; you can redistribute it and/or modify it under the
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7 // terms of the GNU General Public License as published by the
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8 // Free Software Foundation; either version 3, or (at your option)
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9 // any later version.
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10
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11 // This library is distributed in the hope that it will be useful,
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12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 // GNU General Public License for more details.
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15
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16 // Under Section 7 of GPL version 3, you are granted additional
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17 // permissions described in the GCC Runtime Library Exception, version
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18 // 3.1, as published by the Free Software Foundation.
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19
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20 // You should have received a copy of the GNU General Public License and
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21 // a copy of the GCC Runtime Library Exception along with this program;
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22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 // <http://www.gnu.org/licenses/>.
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24
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25 //
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26 // ISO C++ 14882: 22.2.1.5 Template class codecvt
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27 //
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28
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29 // Written by Benjamin Kosnik <bkoz@redhat.com>
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30
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31 /** @file ext/codecvt_specializations.h
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32 * This file is a GNU extension to the Standard C++ Library.
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33 */
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34
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35 #ifndef _EXT_CODECVT_SPECIALIZATIONS_H
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36 #define _EXT_CODECVT_SPECIALIZATIONS_H 1
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37
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38 #include <bits/c++config.h>
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39 #include <locale>
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40 #include <iconv.h>
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41
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42 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
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43 {
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44 _GLIBCXX_BEGIN_NAMESPACE_VERSION
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45 _GLIBCXX_BEGIN_NAMESPACE_CXX11
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46
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47 /// Extension to use iconv for dealing with character encodings.
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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
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50 // char_traits, codecvt and ctype.
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51 class encoding_state
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52 {
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53 public:
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54 // Types:
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55 // NB: A conversion descriptor subsumes and enhances the
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56 // functionality of a simple state type such as mbstate_t.
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57 typedef iconv_t descriptor_type;
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58
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59 protected:
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60 // Name of internal character set encoding.
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61 std::string _M_int_enc;
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62
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63 // Name of external character set encoding.
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64 std::string _M_ext_enc;
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65
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66 // Conversion descriptor between external encoding to internal encoding.
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67 descriptor_type _M_in_desc;
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68
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69 // Conversion descriptor between internal encoding to external encoding.
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70 descriptor_type _M_out_desc;
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71
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72 // The byte-order marker for the external encoding, if necessary.
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73 int _M_ext_bom;
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74
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75 // The byte-order marker for the internal encoding, if necessary.
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76 int _M_int_bom;
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77
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78 // Number of external bytes needed to construct one complete
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79 // character in the internal encoding.
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80 // NB: -1 indicates variable, or stateful, encodings.
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81 int _M_bytes;
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82
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83 public:
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84 explicit
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85 encoding_state()
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86 : _M_in_desc(0), _M_out_desc(0), _M_ext_bom(0), _M_int_bom(0), _M_bytes(0)
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87 { }
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88
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89 explicit
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90 encoding_state(const char* __int, const char* __ext,
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91 int __ibom = 0, int __ebom = 0, int __bytes = 1)
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92 : _M_int_enc(__int), _M_ext_enc(__ext), _M_in_desc(0), _M_out_desc(0),
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93 _M_ext_bom(__ebom), _M_int_bom(__ibom), _M_bytes(__bytes)
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94 { init(); }
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95
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96 // 21.1.2 traits typedefs
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97 // p4
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98 // typedef STATE_T state_type
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99 // requires: state_type shall meet the requirements of
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100 // CopyConstructible types (20.1.3)
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101 // NB: This does not preserve the actual state of the conversion
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102 // descriptor member, but it does duplicate the encoding
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103 // information.
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104 encoding_state(const encoding_state& __obj) : _M_in_desc(0), _M_out_desc(0)
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105 { construct(__obj); }
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106
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107 // Need assignment operator as well.
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108 encoding_state&
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109 operator=(const encoding_state& __obj)
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110 {
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111 construct(__obj);
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112 return *this;
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113 }
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114
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115 ~encoding_state()
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116 { destroy(); }
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117
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118 bool
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119 good() const throw()
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120 {
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121 const descriptor_type __err = (iconv_t)(-1);
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122 bool __test = _M_in_desc && _M_in_desc != __err;
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123 __test &= _M_out_desc && _M_out_desc != __err;
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124 return __test;
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125 }
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126
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127 int
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128 character_ratio() const
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129 { return _M_bytes; }
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130
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131 const std::string
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132 internal_encoding() const
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133 { return _M_int_enc; }
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134
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135 int
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136 internal_bom() const
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137 { return _M_int_bom; }
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138
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139 const std::string
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140 external_encoding() const
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141 { return _M_ext_enc; }
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142
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143 int
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144 external_bom() const
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145 { return _M_ext_bom; }
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146
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147 const descriptor_type&
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148 in_descriptor() const
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149 { return _M_in_desc; }
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150
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151 const descriptor_type&
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152 out_descriptor() const
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153 { return _M_out_desc; }
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154
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155 protected:
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156 void
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157 init()
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158 {
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159 const descriptor_type __err = (iconv_t)(-1);
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160 const bool __have_encodings = _M_int_enc.size() && _M_ext_enc.size();
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161 if (!_M_in_desc && __have_encodings)
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162 {
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163 _M_in_desc = iconv_open(_M_int_enc.c_str(), _M_ext_enc.c_str());
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164 if (_M_in_desc == __err)
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165 std::__throw_runtime_error(__N("encoding_state::_M_init "
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166 "creating iconv input descriptor failed"));
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167 }
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168 if (!_M_out_desc && __have_encodings)
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169 {
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170 _M_out_desc = iconv_open(_M_ext_enc.c_str(), _M_int_enc.c_str());
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171 if (_M_out_desc == __err)
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172 std::__throw_runtime_error(__N("encoding_state::_M_init "
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173 "creating iconv output descriptor failed"));
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174 }
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175 }
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176
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177 void
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178 construct(const encoding_state& __obj)
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179 {
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180 destroy();
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181 _M_int_enc = __obj._M_int_enc;
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182 _M_ext_enc = __obj._M_ext_enc;
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183 _M_ext_bom = __obj._M_ext_bom;
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184 _M_int_bom = __obj._M_int_bom;
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185 _M_bytes = __obj._M_bytes;
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186 init();
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187 }
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188
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189 void
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190 destroy() throw()
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191 {
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192 const descriptor_type __err = (iconv_t)(-1);
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193 if (_M_in_desc && _M_in_desc != __err)
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194 {
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195 iconv_close(_M_in_desc);
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196 _M_in_desc = 0;
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197 }
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198 if (_M_out_desc && _M_out_desc != __err)
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199 {
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200 iconv_close(_M_out_desc);
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201 _M_out_desc = 0;
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202 }
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203 }
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204 };
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205
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206 /// encoding_char_traits
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207 // Custom traits type with encoding_state for the state type, and the
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208 // associated fpos<encoding_state> for the position type, all other
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209 // bits equivalent to the required char_traits instantiations.
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210 template<typename _CharT>
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211 struct encoding_char_traits
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212 : public std::char_traits<_CharT>
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213 {
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214 typedef encoding_state state_type;
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215 typedef typename std::fpos<state_type> pos_type;
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216 };
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217
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218 _GLIBCXX_END_NAMESPACE_CXX11
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219 _GLIBCXX_END_NAMESPACE_VERSION
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220 } // namespace
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221
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222
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223 namespace std _GLIBCXX_VISIBILITY(default)
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224 {
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225 _GLIBCXX_BEGIN_NAMESPACE_VERSION
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226
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227 using __gnu_cxx::encoding_state;
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228
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229 /// codecvt<InternT, _ExternT, encoding_state> specialization.
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230 // This partial specialization takes advantage of iconv to provide
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231 // code conversions between a large number of character encodings.
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232 template<typename _InternT, typename _ExternT>
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233 class codecvt<_InternT, _ExternT, encoding_state>
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234 : public __codecvt_abstract_base<_InternT, _ExternT, encoding_state>
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235 {
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236 public:
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237 // Types:
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238 typedef codecvt_base::result result;
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239 typedef _InternT intern_type;
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240 typedef _ExternT extern_type;
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241 typedef __gnu_cxx::encoding_state state_type;
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242 typedef state_type::descriptor_type descriptor_type;
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243
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244 // Data Members:
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245 static locale::id id;
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246
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247 explicit
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248 codecvt(size_t __refs = 0)
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249 : __codecvt_abstract_base<intern_type, extern_type, state_type>(__refs)
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250 { }
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251
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252 explicit
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253 codecvt(state_type& __enc, size_t __refs = 0)
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254 : __codecvt_abstract_base<intern_type, extern_type, state_type>(__refs)
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255 { }
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256
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257 protected:
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258 virtual
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259 ~codecvt() { }
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260
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261 virtual result
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262 do_out(state_type& __state, const intern_type* __from,
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263 const intern_type* __from_end, const intern_type*& __from_next,
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264 extern_type* __to, extern_type* __to_end,
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265 extern_type*& __to_next) const;
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266
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267 virtual result
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268 do_unshift(state_type& __state, extern_type* __to,
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269 extern_type* __to_end, extern_type*& __to_next) const;
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270
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271 virtual result
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272 do_in(state_type& __state, const extern_type* __from,
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273 const extern_type* __from_end, const extern_type*& __from_next,
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274 intern_type* __to, intern_type* __to_end,
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275 intern_type*& __to_next) const;
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276
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277 virtual int
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278 do_encoding() const throw();
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279
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280 virtual bool
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281 do_always_noconv() const throw();
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282
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283 virtual int
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284 do_length(state_type&, const extern_type* __from,
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285 const extern_type* __end, size_t __max) const;
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286
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287 virtual int
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288 do_max_length() const throw();
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289 };
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290
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291 template<typename _InternT, typename _ExternT>
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292 locale::id
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293 codecvt<_InternT, _ExternT, encoding_state>::id;
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294
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295 // This adaptor works around the signature problems of the second
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296 // argument to iconv(): SUSv2 and others use 'const char**', but glibc 2.2
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297 // uses 'char**', which matches the POSIX 1003.1-2001 standard.
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298 // Using this adaptor, g++ will do the work for us.
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299 template<typename _Tp>
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300 inline size_t
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301 __iconv_adaptor(size_t(*__func)(iconv_t, _Tp, size_t*, char**, size_t*),
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302 iconv_t __cd, char** __inbuf, size_t* __inbytes,
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303 char** __outbuf, size_t* __outbytes)
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304 { return __func(__cd, (_Tp)__inbuf, __inbytes, __outbuf, __outbytes); }
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305
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306 template<typename _InternT, typename _ExternT>
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307 codecvt_base::result
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308 codecvt<_InternT, _ExternT, encoding_state>::
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309 do_out(state_type& __state, const intern_type* __from,
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310 const intern_type* __from_end, const intern_type*& __from_next,
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311 extern_type* __to, extern_type* __to_end,
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312 extern_type*& __to_next) const
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313 {
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314 result __ret = codecvt_base::error;
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315 if (__state.good())
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316 {
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317 const descriptor_type& __desc = __state.out_descriptor();
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318 const size_t __fmultiple = sizeof(intern_type);
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319 size_t __fbytes = __fmultiple * (__from_end - __from);
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320 const size_t __tmultiple = sizeof(extern_type);
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321 size_t __tbytes = __tmultiple * (__to_end - __to);
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322
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323 // Argument list for iconv specifies a byte sequence. Thus,
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324 // all to/from arrays must be brutally casted to char*.
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325 char* __cto = reinterpret_cast<char*>(__to);
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326 char* __cfrom;
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327 size_t __conv;
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328
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329 // Some encodings need a byte order marker as the first item
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330 // in the byte stream, to designate endian-ness. The default
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331 // value for the byte order marker is NULL, so if this is
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332 // the case, it's not necessary and we can just go on our
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333 // merry way.
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334 int __int_bom = __state.internal_bom();
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335 if (__int_bom)
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336 {
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337 size_t __size = __from_end - __from;
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338 intern_type* __cfixed = static_cast<intern_type*>
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339 (__builtin_alloca(sizeof(intern_type) * (__size + 1)));
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340 __cfixed[0] = static_cast<intern_type>(__int_bom);
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341 char_traits<intern_type>::copy(__cfixed + 1, __from, __size);
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342 __cfrom = reinterpret_cast<char*>(__cfixed);
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343 __conv = __iconv_adaptor(iconv, __desc, &__cfrom,
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344 &__fbytes, &__cto, &__tbytes);
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345 }
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346 else
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347 {
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348 intern_type* __cfixed = const_cast<intern_type*>(__from);
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349 __cfrom = reinterpret_cast<char*>(__cfixed);
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350 __conv = __iconv_adaptor(iconv, __desc, &__cfrom, &__fbytes,
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351 &__cto, &__tbytes);
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352 }
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353
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354 if (__conv != size_t(-1))
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355 {
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356 __from_next = reinterpret_cast<const intern_type*>(__cfrom);
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357 __to_next = reinterpret_cast<extern_type*>(__cto);
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358 __ret = codecvt_base::ok;
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359 }
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360 else
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361 {
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362 if (__fbytes < __fmultiple * (__from_end - __from))
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363 {
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364 __from_next = reinterpret_cast<const intern_type*>(__cfrom);
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365 __to_next = reinterpret_cast<extern_type*>(__cto);
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366 __ret = codecvt_base::partial;
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367 }
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368 else
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369 __ret = codecvt_base::error;
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370 }
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371 }
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372 return __ret;
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373 }
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374
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375 template<typename _InternT, typename _ExternT>
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376 codecvt_base::result
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377 codecvt<_InternT, _ExternT, encoding_state>::
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378 do_unshift(state_type& __state, extern_type* __to,
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379 extern_type* __to_end, extern_type*& __to_next) const
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380 {
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381 result __ret = codecvt_base::error;
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382 if (__state.good())
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383 {
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384 const descriptor_type& __desc = __state.in_descriptor();
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385 const size_t __tmultiple = sizeof(intern_type);
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386 size_t __tlen = __tmultiple * (__to_end - __to);
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387
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388 // Argument list for iconv specifies a byte sequence. Thus,
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389 // all to/from arrays must be brutally casted to char*.
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390 char* __cto = reinterpret_cast<char*>(__to);
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391 size_t __conv = __iconv_adaptor(iconv,__desc, 0, 0,
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392 &__cto, &__tlen);
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393
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394 if (__conv != size_t(-1))
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395 {
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396 __to_next = reinterpret_cast<extern_type*>(__cto);
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397 if (__tlen == __tmultiple * (__to_end - __to))
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398 __ret = codecvt_base::noconv;
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399 else if (__tlen == 0)
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400 __ret = codecvt_base::ok;
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401 else
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402 __ret = codecvt_base::partial;
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403 }
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404 else
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405 __ret = codecvt_base::error;
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406 }
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407 return __ret;
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408 }
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409
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410 template<typename _InternT, typename _ExternT>
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411 codecvt_base::result
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412 codecvt<_InternT, _ExternT, encoding_state>::
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413 do_in(state_type& __state, const extern_type* __from,
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414 const extern_type* __from_end, const extern_type*& __from_next,
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415 intern_type* __to, intern_type* __to_end,
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416 intern_type*& __to_next) const
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417 {
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418 result __ret = codecvt_base::error;
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419 if (__state.good())
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420 {
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421 const descriptor_type& __desc = __state.in_descriptor();
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422 const size_t __fmultiple = sizeof(extern_type);
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423 size_t __flen = __fmultiple * (__from_end - __from);
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424 const size_t __tmultiple = sizeof(intern_type);
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425 size_t __tlen = __tmultiple * (__to_end - __to);
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426
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427 // Argument list for iconv specifies a byte sequence. Thus,
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428 // all to/from arrays must be brutally casted to char*.
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429 char* __cto = reinterpret_cast<char*>(__to);
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430 char* __cfrom;
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431 size_t __conv;
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432
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433 // Some encodings need a byte order marker as the first item
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434 // in the byte stream, to designate endian-ness. The default
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435 // value for the byte order marker is NULL, so if this is
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436 // the case, it's not necessary and we can just go on our
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437 // merry way.
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438 int __ext_bom = __state.external_bom();
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439 if (__ext_bom)
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440 {
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441 size_t __size = __from_end - __from;
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442 extern_type* __cfixed = static_cast<extern_type*>
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443 (__builtin_alloca(sizeof(extern_type) * (__size + 1)));
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444 __cfixed[0] = static_cast<extern_type>(__ext_bom);
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445 char_traits<extern_type>::copy(__cfixed + 1, __from, __size);
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446 __cfrom = reinterpret_cast<char*>(__cfixed);
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447 __conv = __iconv_adaptor(iconv, __desc, &__cfrom,
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448 &__flen, &__cto, &__tlen);
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449 }
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450 else
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451 {
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452 extern_type* __cfixed = const_cast<extern_type*>(__from);
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453 __cfrom = reinterpret_cast<char*>(__cfixed);
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454 __conv = __iconv_adaptor(iconv, __desc, &__cfrom,
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455 &__flen, &__cto, &__tlen);
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456 }
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457
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458
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459 if (__conv != size_t(-1))
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460 {
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461 __from_next = reinterpret_cast<const extern_type*>(__cfrom);
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462 __to_next = reinterpret_cast<intern_type*>(__cto);
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463 __ret = codecvt_base::ok;
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464 }
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465 else
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466 {
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467 if (__flen < static_cast<size_t>(__from_end - __from))
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468 {
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469 __from_next = reinterpret_cast<const extern_type*>(__cfrom);
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470 __to_next = reinterpret_cast<intern_type*>(__cto);
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471 __ret = codecvt_base::partial;
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472 }
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473 else
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474 __ret = codecvt_base::error;
|
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|
475 }
|
|
|
476 }
|
|
|
477 return __ret;
|
|
|
478 }
|
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479
|
|
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480 template<typename _InternT, typename _ExternT>
|
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481 int
|
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482 codecvt<_InternT, _ExternT, encoding_state>::
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483 do_encoding() const throw()
|
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484 {
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485 int __ret = 0;
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|
486 if (sizeof(_ExternT) <= sizeof(_InternT))
|
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|
487 __ret = sizeof(_InternT) / sizeof(_ExternT);
|
|
|
488 return __ret;
|
|
|
489 }
|
|
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490
|
|
|
491 template<typename _InternT, typename _ExternT>
|
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492 bool
|
|
|
493 codecvt<_InternT, _ExternT, encoding_state>::
|
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|
494 do_always_noconv() const throw()
|
|
|
495 { return false; }
|
|
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496
|
|
|
497 template<typename _InternT, typename _ExternT>
|
|
|
498 int
|
|
|
499 codecvt<_InternT, _ExternT, encoding_state>::
|
|
|
500 do_length(state_type&, const extern_type* __from,
|
|
|
501 const extern_type* __end, size_t __max) const
|
|
|
502 { return std::min(__max, static_cast<size_t>(__end - __from)); }
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|
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503
|
|
|
504 // _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
|
505 // 74. Garbled text for codecvt::do_max_length
|
|
|
506 template<typename _InternT, typename _ExternT>
|
|
|
507 int
|
|
|
508 codecvt<_InternT, _ExternT, encoding_state>::
|
|
|
509 do_max_length() const throw()
|
|
|
510 { return 1; }
|
|
|
511
|
|
|
512 _GLIBCXX_END_NAMESPACE_VERSION
|
|
|
513 } // namespace
|
|
|
514
|
|
|
515 #endif
|
