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<a href="core_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright 2006 Nemanja Trifunovic</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> </div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">Permission is hereby granted, free of charge, to any person or organization</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">obtaining a copy of the software and accompanying documentation covered by</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">this license (the "Software") to use, reproduce, display, distribute,</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">execute, and transmit the Software, and to prepare derivative works of the</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">Software, and to permit third-parties to whom the Software is furnished to</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">do so, all subject to the following:</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"></span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">The copyright notices in the Software and this entire statement, including</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">the above license grant, this restriction and the following disclaimer,</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">must be included in all copies of the Software, in whole or in part, and</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">all derivative works of the Software, unless such copies or derivative</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment">works are solely in the form of machine-executable object code generated by</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">a source language processor.</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"></span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment">IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment">SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment">DEALINGS IN THE SOFTWARE.</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">*/</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> </div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor">#ifndef UTF8_FOR_CPP_CORE_H_2675DCD0_9480_4c0c_B92A_CC14C027B731</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor"></span><span class="preprocessor">#define UTF8_FOR_CPP_CORE_H_2675DCD0_9480_4c0c_B92A_CC14C027B731</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="preprocessor">#include <boost/cstdint.hpp></span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> </div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="preprocessor">#include <iterator></span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> </div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="keyword">namespace </span>utf8</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> {</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="comment">// The typedefs for 8-bit, 16-bit and 32-bit unsigned integers</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="comment">// You may need to change them to match your system. </span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="comment">// These typedefs have the same names as ones from cstdint, or boost/cstdint</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keyword">typedef</span> boost::uint8_t uint8_t;</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keyword">typedef</span> boost::uint16_t uint16_t;</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keyword">typedef</span> boost::uint32_t uint32_t;</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> </div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment">// Helper code - not intended to be directly called by the library users. May be changed at any time</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="keyword">namespace </span>internal</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> { </div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="comment">// Unicode constants</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="comment">// Leading (high) surrogates: 0xd800 - 0xdbff</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="comment">// Trailing (low) surrogates: 0xdc00 - 0xdfff</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keyword">const</span> uint16_t LEAD_SURROGATE_MIN = 0xd800u;</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keyword">const</span> uint16_t LEAD_SURROGATE_MAX = 0xdbffu;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keyword">const</span> uint16_t TRAIL_SURROGATE_MIN = 0xdc00u;</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keyword">const</span> uint16_t TRAIL_SURROGATE_MAX = 0xdfffu;</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keyword">const</span> uint16_t LEAD_OFFSET = LEAD_SURROGATE_MIN - (0x10000 >> 10);</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keyword">const</span> uint32_t SURROGATE_OFFSET = 0x10000u - (LEAD_SURROGATE_MIN << 10) - TRAIL_SURROGATE_MIN;</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="comment">// Maximum valid value for a Unicode code point</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keyword">const</span> uint32_t CODE_POINT_MAX = 0x0010ffffu;</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keyword">template</span><<span class="keyword">typename</span> octet_type></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keyword">inline</span> uint8_t mask8(octet_type oc)</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  {</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keywordflow">return</span> <span class="keyword">static_cast<</span>uint8_t<span class="keyword">></span>(0xff & oc);</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  }</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keyword">template</span><<span class="keyword">typename</span> u16_type></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keyword">inline</span> uint16_t mask16(u16_type oc)</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  {</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keywordflow">return</span> <span class="keyword">static_cast<</span>uint16_t<span class="keyword">></span>(0xffff & oc);</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  }</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keyword">template</span><<span class="keyword">typename</span> octet_type></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span> is_trail(octet_type oc)</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  {</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keywordflow">return</span> ((mask8(oc) >> 6) == 0x2);</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  }</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> </div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> u16></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span> is_surrogate(u16 cp)</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  {</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordflow">return</span> (cp >= LEAD_SURROGATE_MIN && cp <= TRAIL_SURROGATE_MAX);</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  }</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> </div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> u32></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span> is_code_point_valid(u32 cp)</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  {</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">return</span> (cp <= CODE_POINT_MAX && !is_surrogate(cp) && cp != 0xfffe && cp != 0xffff);</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  } </div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> </div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> octet_iterator></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keyword">inline</span> <span class="keyword">typename</span> std::iterator_traits<octet_iterator>::difference_type</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  sequence_length(octet_iterator lead_it)</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  {</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  uint8_t lead = mask8(*lead_it);</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordflow">if</span> (lead < 0x80) </div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((lead >> 5) == 0x6)</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keywordflow">return</span> 2;</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((lead >> 4) == 0xe)</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordflow">return</span> 3;</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((lead >> 3) == 0x1e)</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keywordflow">return</span> 4;</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordflow">else</span> </div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  }</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> </div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keyword">enum</span> utf_error {OK, NOT_ENOUGH_ROOM, INVALID_LEAD, INCOMPLETE_SEQUENCE, OVERLONG_SEQUENCE, INVALID_CODE_POINT};</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> </div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> octet_iterator></div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  utf_error validate_next(octet_iterator& it, octet_iterator end, uint32_t* code_point)</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  {</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  uint32_t cp = mask8(*it);</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="comment">// Check the lead octet</span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<octet_iterator>::difference_type octet_difference_type;</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  octet_difference_type length = sequence_length(it);</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> </div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="comment">// "Shortcut" for ASCII characters</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keywordflow">if</span> (length == 1) {</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keywordflow">if</span> (end - it > 0) {</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordflow">if</span> (code_point)</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  *code_point = cp;</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  ++it;</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keywordflow">return</span> OK;</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  }</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="keywordflow">return</span> NOT_ENOUGH_ROOM;</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  }</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> </div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="comment">// Do we have enough memory? </span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="keywordflow">if</span> (std::distance(it, end) < length)</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="keywordflow">return</span> NOT_ENOUGH_ROOM;</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  </div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="comment">// Check trail octets and calculate the code point</span></div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="keywordflow">switch</span> (length) {</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keywordflow">case</span> 0:</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="keywordflow">return</span> INVALID_LEAD;</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordflow">case</span> 2:</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  <span class="keywordflow">if</span> (is_trail(*(++it))) { </div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  cp = ((cp << 6) & 0x7ff) + ((*it) & 0x3f);</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  }</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  --it;</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="keywordflow">return</span> INCOMPLETE_SEQUENCE;</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  }</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="keywordflow">case</span> 3:</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="keywordflow">if</span> (is_trail(*(++it))) {</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  cp = ((cp << 12) & 0xffff) + ((mask8(*it) << 6) & 0xfff);</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="keywordflow">if</span> (is_trail(*(++it))) {</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  cp += (*it) & 0x3f;</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  }</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  std::advance(it, -2);</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="keywordflow">return</span> INCOMPLETE_SEQUENCE;</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  }</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  }</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  --it;</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <span class="keywordflow">return</span> INCOMPLETE_SEQUENCE;</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  }</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="keywordflow">case</span> 4:</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="keywordflow">if</span> (is_trail(*(++it))) {</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  cp = ((cp << 18) & 0x1fffff) + ((mask8(*it) << 12) & 0x3ffff); </div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="keywordflow">if</span> (is_trail(*(++it))) {</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  cp += (mask8(*it) << 6) & 0xfff;</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <span class="keywordflow">if</span> (is_trail(*(++it))) {</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  cp += (*it) & 0x3f; </div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  }</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  std::advance(it, -3);</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="keywordflow">return</span> INCOMPLETE_SEQUENCE;</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  }</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  }</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  std::advance(it, -2);</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <span class="keywordflow">return</span> INCOMPLETE_SEQUENCE;</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  }</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  }</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  --it;</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  <span class="keywordflow">return</span> INCOMPLETE_SEQUENCE;</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  }</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  }</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="comment">// Is the code point valid?</span></div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="keywordflow">if</span> (!is_code_point_valid(cp)) {</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  <span class="keywordflow">for</span> (octet_difference_type i = 0; i < length - 1; ++i) </div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  --it;</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  <span class="keywordflow">return</span> INVALID_CODE_POINT;</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  }</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  </div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  <span class="keywordflow">if</span> (code_point)</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  *code_point = cp;</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  </div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  <span class="keywordflow">if</span> (cp < 0x80) {</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="keywordflow">if</span> (length != 1) {</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  std::advance(it, -(length-1));</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="keywordflow">return</span> OVERLONG_SEQUENCE;</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  }</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  }</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (cp < 0x800) {</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  <span class="keywordflow">if</span> (length != 2) {</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  std::advance(it, -(length-1));</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <span class="keywordflow">return</span> OVERLONG_SEQUENCE;</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  }</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  }</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (cp < 0x10000) {</div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <span class="keywordflow">if</span> (length != 3) {</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  std::advance(it, -(length-1));</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  <span class="keywordflow">return</span> OVERLONG_SEQUENCE;</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  }</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  }</div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  </div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  ++it;</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  <span class="keywordflow">return</span> OK; </div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  }</div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span> </div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> octet_iterator></div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  <span class="keyword">inline</span> utf_error validate_next(octet_iterator& it, octet_iterator end) {</div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <span class="keywordflow">return</span> validate_next(it, end, 0);</div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  }</div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span> </div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span> } <span class="comment">// namespace internal </span></div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span> </div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span> </div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  <span class="comment">// Byte order mark</span></div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  <span class="keyword">const</span> uint8_t bom[] = {0xef, 0xbb, 0xbf}; </div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span> </div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> octet_iterator></div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  octet_iterator find_invalid(octet_iterator start, octet_iterator end)</div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  {</div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  octet_iterator result = start;</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="keywordflow">while</span> (result != end) {</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  internal::utf_error err_code = internal::validate_next(result, end);</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <span class="keywordflow">if</span> (err_code != internal::OK)</div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  <span class="keywordflow">return</span> result;</div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  }</div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  <span class="keywordflow">return</span> result;</div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  }</div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span> </div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> octet_iterator></div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span> is_valid(octet_iterator start, octet_iterator end)</div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  {</div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  <span class="keywordflow">return</span> (find_invalid(start, end) == end);</div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  }</div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span> </div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> octet_iterator></div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span> is_bom (octet_iterator it)</div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  {</div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  <span class="keywordflow">return</span> (</div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  (internal::mask8(*it++)) == bom[0] &&</div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  (internal::mask8(*it++)) == bom[1] &&</div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  (internal::mask8(*it)) == bom[2]</div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  );</div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  }</div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span> } <span class="comment">// namespace utf8</span></div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span> </div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span> <span class="preprocessor">#endif // header guard</span></div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span> </div>
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