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<li class="navelem"><a class="el" href="dir_68267d1309a1af8e8297ef4c3efbcdba.html">src</a></li> </ul>
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<div class="title">convert.cpp</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright (c) 2020 Egor Tensin <Egor.Tensin@gmail.com></span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// This file is part of the "winapi-utf8" project.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// For details, see https://github.com/egor-tensin/winapi-utf8.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// Distributed under the MIT License.</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>  </div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="preprocessor">#include <<a class="code" href="utf8_8hpp.html">winapi/utf8.hpp</a>></span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>  </div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#include <windows.h></span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>  </div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include <cstddef></span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include <cstdint></span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include <sstream></span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include <stdexcept></span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include <string></span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include <vector></span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  </div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">namespace </span>winapi {</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="keyword">namespace </span>{</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  </div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> std::runtime_error error(<span class="keyword">const</span> <span class="keywordtype">char</span>* <span class="keyword">function</span>, DWORD code) {</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  std::ostringstream oss;</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  oss << <span class="stringliteral">"Function "</span> << <span class="keyword">function</span> << <span class="stringliteral">" failed with error code "</span> << code;</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="keywordflow">return</span> std::runtime_error{oss.str()};</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> }</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  </div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="keywordtype">bool</span> size_t_to_int(std::size_t src, int32_t& dest) {</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="keywordflow">if</span> (src > <span class="keyword">static_cast<</span>uint32_t<span class="keyword">></span>(INT32_MAX))</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  dest = <span class="keyword">static_cast<</span>int32_t<span class="keyword">></span>(src);</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> }</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  </div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="keywordtype">bool</span> int_to_size_t(int32_t src, std::size_t& dest) {</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keywordflow">if</span> (src < 0 || <span class="keyword">static_cast<</span>uint32_t<span class="keyword">></span>(src) > SIZE_MAX)</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  dest = <span class="keyword">static_cast<</span>std::size_t<span class="keyword">></span>(src);</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> }</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> int32_t convert_input_bytes_to_bytes(std::size_t nb) {</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  int32_t real_nb = 0;</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  </div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordflow">if</span> (!size_t_to_int(nb, real_nb)) {</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  std::ostringstream oss;</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  oss << <span class="stringliteral">"Input buffer is too large at "</span> << nb << <span class="stringliteral">" bytes"</span>;</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordflow">throw</span> std::runtime_error{oss.str()};</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  }</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  </div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordflow">return</span> real_nb;</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> }</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  </div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> int32_t convert_input_bytes_to_chars(std::size_t nb) {</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">if</span> (nb % <span class="keyword">sizeof</span>(WCHAR) != 0) {</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  std::ostringstream oss;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  oss << <span class="stringliteral">"Buffer size invalid at "</span> << nb << <span class="stringliteral">" bytes"</span>;</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordflow">throw</span> std::runtime_error{oss.str()};</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  }</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  </div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keyword">const</span> std::size_t nch = nb / <span class="keyword">sizeof</span>(WCHAR);</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  int32_t real_nch = 0;</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  </div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordflow">if</span> (!size_t_to_int(nch, real_nch)) {</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  std::ostringstream oss;</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  oss << <span class="stringliteral">"Input buffer is too large at "</span> << nch << <span class="stringliteral">" characters"</span>;</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">throw</span> std::runtime_error{oss.str()};</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  }</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="keywordflow">return</span> real_nch;</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> }</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="keyword">template</span> <<span class="keyword">typename</span> CharT></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> std::vector<CharT> output_buffer(int32_t size) {</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  std::size_t real_size = 0;</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  </div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keywordflow">if</span> (!int_to_size_t(size, real_size)) {</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  std::ostringstream oss;</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  oss << <span class="stringliteral">"Buffer size invalid at "</span> << size << <span class="stringliteral">" bytes"</span>;</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keywordflow">throw</span> std::runtime_error{oss.str()};</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  }</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  </div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  std::vector<CharT> buffer;</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  buffer.resize(real_size);</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordflow">return</span> buffer;</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>  </div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="keyword">template</span> <<span class="keyword">typename</span> CharT></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="keywordtype">void</span> verify_output(<span class="keyword">const</span> std::vector<CharT>& expected, int32_t _actual_size) {</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  std::size_t actual_size = 0;</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>  <span class="keywordflow">if</span> (!int_to_size_t(_actual_size, actual_size) || expected.size() != actual_size) {</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  std::ostringstream oss;</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  oss << <span class="stringliteral">"Expected output length "</span> << expected.size() << <span class="stringliteral">", got "</span> << _actual_size;</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordflow">throw</span> std::runtime_error{oss.str()};</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> }</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  </div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> } <span class="comment">// namespace</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  </div>
<div class="line"><a name="l00099"></a><span class="lineno"><a class="line" href="utf8_8hpp.html#a4b174d9e77015c16d3e3ab6ad95000b6"> 99</a></span> std::wstring <a class="code" href="utf8_8hpp.html#a4b174d9e77015c16d3e3ab6ad95000b6">widen</a>(<span class="keyword">const</span> std::string& src) {</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordflow">return</span> <a class="code" href="utf8_8hpp.html#a4b174d9e77015c16d3e3ab6ad95000b6">widen</a>(src.c_str(), src.size());</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> }</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  </div>
<div class="line"><a name="l00103"></a><span class="lineno"><a class="line" href="utf8_8hpp.html#a4e76f5bf03006c3d073b189ac937c78f"> 103</a></span> std::wstring <a class="code" href="utf8_8hpp.html#a4b174d9e77015c16d3e3ab6ad95000b6">widen</a>(<span class="keyword">const</span> <span class="keywordtype">void</span>* src, std::size_t in_nb) {</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keyword">const</span> DWORD flags = MB_ERR_INVALID_CHARS;</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  </div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keyword">const</span> <span class="keyword">auto</span> in_data = <span class="keyword">reinterpret_cast<</span><span class="keyword">const </span><span class="keywordtype">char</span>*<span class="keyword">></span>(src);</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keyword">const</span> <span class="keyword">auto</span> real_in_nb = convert_input_bytes_to_bytes(in_nb);</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  </div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keyword">auto</span> out_nch = ::MultiByteToWideChar(CP_UTF8, flags, in_data, real_in_nb, NULL, 0);</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  </div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordflow">if</span> (out_nch == 0) {</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordflow">throw</span> error(<span class="stringliteral">"MultiByteToWideChar"</span>, GetLastError());</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  }</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  </div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  static_assert(<span class="keyword">sizeof</span>(<span class="keywordtype">wchar_t</span>) == <span class="keyword">sizeof</span>(WCHAR), <span class="stringliteral">"wchar_t != WCHAR"</span>);</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keyword">auto</span> out = output_buffer<wchar_t>(out_nch);</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>  out_nch = ::MultiByteToWideChar(CP_UTF8, flags, in_data, real_in_nb, out.data(), out_nch);</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  </div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keywordflow">if</span> (out_nch == 0) {</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordflow">throw</span> error(<span class="stringliteral">"MultiByteToWideChar"</span>, GetLastError());</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  }</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  </div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  verify_output(out, out_nch);</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">return</span> {out.data(), out.size()};</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> }</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  </div>
<div class="line"><a name="l00128"></a><span class="lineno"><a class="line" href="utf8_8hpp.html#ae643a038e8194c1f0d14bdf9edcafcb7"> 128</a></span> std::string <a class="code" href="utf8_8hpp.html#ae643a038e8194c1f0d14bdf9edcafcb7">narrow</a>(<span class="keyword">const</span> std::wstring& src) {</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  static_assert(<span class="keyword">sizeof</span>(<span class="keywordtype">wchar_t</span>) == <span class="keyword">sizeof</span>(WCHAR), <span class="stringliteral">"wchar_t != WCHAR"</span>);</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordflow">return</span> <a class="code" href="utf8_8hpp.html#ae643a038e8194c1f0d14bdf9edcafcb7">narrow</a>(src.c_str(), src.size() * <span class="keyword">sizeof</span>(std::wstring::value_type));</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> }</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  </div>
<div class="line"><a name="l00133"></a><span class="lineno"><a class="line" href="utf8_8hpp.html#a2795e1f7649c053417f39b90d3f3480f"> 133</a></span> std::string <a class="code" href="utf8_8hpp.html#ae643a038e8194c1f0d14bdf9edcafcb7">narrow</a>(<span class="keyword">const</span> std::u16string& src) {</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keywordflow">return</span> <a class="code" href="utf8_8hpp.html#ae643a038e8194c1f0d14bdf9edcafcb7">narrow</a>(src.c_str(), src.size() * <span class="keyword">sizeof</span>(std::u16string::value_type));</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> }</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  </div>
<div class="line"><a name="l00137"></a><span class="lineno"><a class="line" href="utf8_8hpp.html#aeeef0f99233162d79ebedc551e87f0d0"> 137</a></span> std::string <a class="code" href="utf8_8hpp.html#ae643a038e8194c1f0d14bdf9edcafcb7">narrow</a>(<span class="keyword">const</span> <span class="keywordtype">void</span>* src, std::size_t in_nb) {</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keyword">const</span> DWORD flags = WC_ERR_INVALID_CHARS;</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  </div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  <span class="keyword">const</span> <span class="keyword">auto</span> in_data = <span class="keyword">reinterpret_cast<</span><span class="keyword">const </span><span class="keywordtype">wchar_t</span>*<span class="keyword">></span>(src);</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="keyword">const</span> <span class="keyword">auto</span> in_nch = convert_input_bytes_to_chars(in_nb);</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="keyword">auto</span> out_nb = ::WideCharToMultiByte(CP_UTF8, flags, in_data, in_nch, NULL, 0, NULL, NULL);</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  </div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="keywordflow">if</span> (out_nb == 0) {</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <span class="keywordflow">throw</span> error(<span class="stringliteral">"WideCharToMultiByte"</span>, GetLastError());</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  }</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  </div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="keyword">auto</span> out = output_buffer<char>(out_nb);</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  </div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  out_nb = ::WideCharToMultiByte(CP_UTF8, flags, in_data, in_nch, out.data(), out_nb, NULL, NULL);</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  </div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="keywordflow">if</span> (out_nb == 0) {</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="keywordflow">throw</span> error(<span class="stringliteral">"WideCharToMultiByte"</span>, GetLastError());</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  }</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  </div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  verify_output(out, out_nb);</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <span class="keywordflow">return</span> {out.data(), out.size()};</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> }</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  </div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span> } <span class="comment">// namespace winapi</span></div>
<div class="ttc" id="autf8_8hpp_html"><div class="ttname"><a href="utf8_8hpp.html">utf8.hpp</a></div><div class="ttdoc">UTF-8 <-> UTF-16 conversion functions.</div></div>
<div class="ttc" id="autf8_8hpp_html_a4b174d9e77015c16d3e3ab6ad95000b6"><div class="ttname"><a href="utf8_8hpp.html#a4b174d9e77015c16d3e3ab6ad95000b6">winapi::widen</a></div><div class="ttdeci">std::wstring widen(const std::string &)</div><div class="ttdef"><b>Definition:</b> <a href="convert_8cpp_source.html#l00099">convert.cpp:99</a></div></div>
<div class="ttc" id="autf8_8hpp_html_ae643a038e8194c1f0d14bdf9edcafcb7"><div class="ttname"><a href="utf8_8hpp.html#ae643a038e8194c1f0d14bdf9edcafcb7">winapi::narrow</a></div><div class="ttdeci">std::string narrow(const std::wstring &)</div><div class="ttdef"><b>Definition:</b> <a href="convert_8cpp_source.html#l00128">convert.cpp:128</a></div></div>
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