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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">handle.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-common" 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-common.</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 <winapi/buffer.hpp></span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#include <<a class="code" href="error_8hpp.html">winapi/error.hpp</a>></span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#include <winapi/handle.hpp></span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include <winapi/utils.hpp></span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>  </div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include <windows.h></span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>  </div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include <cassert></span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include <cstddef></span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include <limits></span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include <sstream></span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include <stdexcept></span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#include <utility></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> <span class="keyword">namespace </span>winapi {</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="keyword">namespace </span>{</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  </div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> std::runtime_error write_file_incomplete(std::size_t expected, std::size_t actual) {</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  std::ostringstream oss;</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  oss << <span class="stringliteral">"WriteFile could only write "</span> << actual << <span class="stringliteral">" bytes instead of "</span> << expected;</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="keywordflow">return</span> std::runtime_error{oss.str()};</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> }</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  </div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="keywordtype">bool</span> is_std_handle(HANDLE handle) {</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keywordflow">return</span> handle == ::GetStdHandle(STD_INPUT_HANDLE) ||</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  handle == ::GetStdHandle(STD_OUTPUT_HANDLE) ||</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  handle == ::GetStdHandle(STD_ERROR_HANDLE);</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> }</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  </div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> } <span class="comment">// namespace</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  </div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> Handle::Handle(HANDLE impl) : m_impl{impl} {}</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> <span class="keywordtype">bool</span> Handle::is_valid()<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keywordflow">return</span> m_impl && is_valid(m_impl.get());</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> }</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="keywordtype">bool</span> Handle::is_valid(HANDLE handle) {</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordflow">return</span> handle != NULL && handle != INVALID_HANDLE_VALUE;</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> }</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  </div>
<div class="line"><a name="l00047"></a><span class="lineno"><a class="line" href="classwinapi_1_1Handle.html#a6f28cc73ae2e3e447251cef0160e3555"> 47</a></span> <span class="keywordtype">void</span> Handle::close() {</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  m_impl.reset();</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>  </div>
<div class="line"><a name="l00051"></a><span class="lineno"><a class="line" href="classwinapi_1_1Handle.html#acc001a0f466d9c92cf7f2ef62896afc5"> 51</a></span> <span class="keywordtype">bool</span> Handle::is_std()<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keywordflow">return</span> is_std_handle(m_impl.get());</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> }</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  </div>
<div class="line"><a name="l00055"></a><span class="lineno"><a class="line" href="classwinapi_1_1Handle.html#a1817fdf127291cf5f47d6429d8f468cd"> 55</a></span> <a class="code" href="classwinapi_1_1Handle.html">Handle</a> Handle::std_in() {</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordflow">return</span> <a class="code" href="classwinapi_1_1Handle.html">Handle</a>{::GetStdHandle(STD_INPUT_HANDLE)};</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"><a class="line" href="classwinapi_1_1Handle.html#a76e96327afd0b943d996c90289f2883e"> 59</a></span> <a class="code" href="classwinapi_1_1Handle.html">Handle</a> Handle::std_out() {</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordflow">return</span> <a class="code" href="classwinapi_1_1Handle.html">Handle</a>{::GetStdHandle(STD_OUTPUT_HANDLE)};</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>  </div>
<div class="line"><a name="l00063"></a><span class="lineno"><a class="line" href="classwinapi_1_1Handle.html#a894d880e1241c9516889a7a63a0c1750"> 63</a></span> <a class="code" href="classwinapi_1_1Handle.html">Handle</a> Handle::std_err() {</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keywordflow">return</span> <a class="code" href="classwinapi_1_1Handle.html">Handle</a>{::GetStdHandle(STD_ERROR_HANDLE)};</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>  </div>
<div class="line"><a name="l00067"></a><span class="lineno"><a class="line" href="classwinapi_1_1Handle.html#a31c8440493e29cdd9b6fc40ffe8c06f1"> 67</a></span> <span class="keywordtype">bool</span> Handle::read_chunk(<a class="code" href="classwinapi_1_1Buffer.html">Buffer</a>& buffer)<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  buffer.resize(max_chunk_size);</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  DWORD nb_read = 0;</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">if</span> (buffer.size() > std::numeric_limits<DWORD>::max())</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordflow">throw</span> std::range_error{<span class="stringliteral">"Read buffer is too large"</span>};</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keyword">const</span> <span class="keyword">auto</span> ret =</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  ::ReadFile(m_impl.get(), buffer.data(), <span class="keyword">static_cast<</span>DWORD<span class="keyword">></span>(buffer.size()), &nb_read, NULL);</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>  buffer.resize(nb_read);</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>  <span class="keywordflow">if</span> (ret) {</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordflow">return</span> nb_read != 0;</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>  </div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keyword">const</span> <span class="keyword">auto</span> ec = GetLastError();</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>  <span class="keywordflow">switch</span> (ec) {</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordflow">case</span> ERROR_BROKEN_PIPE:</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="comment">// We've been reading from an anonymous pipe, and it's been closed.</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">default</span>:</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">throw</span> error::windows(ec, <span class="stringliteral">"ReadFile"</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> }</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  </div>
<div class="line"><a name="l00093"></a><span class="lineno"><a class="line" href="classwinapi_1_1Handle.html#ae340b095569654f8b709614f23577f2e"> 93</a></span> <a class="code" href="classwinapi_1_1Buffer.html">Buffer</a> Handle::read()<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <a class="code" href="classwinapi_1_1Buffer.html">Buffer</a> buffer;</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>  <span class="keywordflow">while</span> (<span class="keyword">true</span>) {</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <a class="code" href="classwinapi_1_1Buffer.html">Buffer</a> chunk;</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keyword">const</span> <span class="keyword">auto</span> next = read_chunk(chunk);</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  buffer.<a class="code" href="classwinapi_1_1Buffer.html#a303645b281fb4f1a4d9e84f1d1370182">add</a>(chunk);</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  </div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordflow">if</span> (!next) {</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  }</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  }</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="keywordflow">return</span> buffer;</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>  </div>
<div class="line"><a name="l00109"></a><span class="lineno"><a class="line" href="classwinapi_1_1Handle.html#afbfe1b7de229eb5656504e05acf9bbcc"> 109</a></span> <span class="keywordtype">void</span> Handle::write(<span class="keyword">const</span> <span class="keywordtype">void</span>* data, std::size_t nb)<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  DWORD nb_written = 0;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  </div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordflow">if</span> (nb > std::numeric_limits<DWORD>::max())</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordflow">throw</span> std::range_error{<span class="stringliteral">"Write buffer is too large"</span>};</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keyword">const</span> <span class="keyword">auto</span> ret = ::WriteFile(m_impl.get(), data, <span class="keyword">static_cast<</span>DWORD<span class="keyword">></span>(nb), &nb_written, NULL);</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  </div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keywordflow">if</span> (!ret) {</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keywordflow">throw</span> error::windows(GetLastError(), <span class="stringliteral">"WriteFile"</span>);</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  }</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> (nb != nb_written) {</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordflow">throw</span> write_file_incomplete(nb, nb_written);</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>  </div>
<div class="line"><a name="l00125"></a><span class="lineno"><a class="line" href="classwinapi_1_1Handle.html#aee2ff37831d686a8140403c10d7ebadd"> 125</a></span> <span class="keywordtype">void</span> Handle::write(<span class="keyword">const</span> <a class="code" href="classwinapi_1_1Buffer.html">Buffer</a>& buffer)<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  write(buffer.data(), buffer.size());</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> }</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> <span class="keywordtype">void</span> Handle::inherit(<span class="keywordtype">bool</span> yes)<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordflow">if</span> (!::SetHandleInformation(m_impl.get(), HANDLE_FLAG_INHERIT, yes ? 1 : 0)) {</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="keywordflow">throw</span> error::windows(GetLastError(), <span class="stringliteral">"SetHandleInformation"</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"> 133</span> }</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  </div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="keywordtype">void</span> Handle::Close::operator()(HANDLE impl)<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keywordflow">if</span> (!is_valid(impl) || is_std_handle(impl))</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keyword">const</span> <span class="keyword">auto</span> ret = ::CloseHandle(impl);</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  assert(ret);</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  WINAPI_UNUSED_PARAMETER(ret);</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> }</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="comment">// namespace winapi</span></div>
<div class="ttc" id="aclasswinapi_1_1Buffer_html"><div class="ttname"><a href="classwinapi_1_1Buffer.html">winapi::Buffer</a></div><div class="ttdoc">Binary data container.</div><div class="ttdef"><b>Definition:</b> <a href="buffer_8hpp_source.html#l00024">buffer.hpp:24</a></div></div>
<div class="ttc" id="aclasswinapi_1_1Buffer_html_a303645b281fb4f1a4d9e84f1d1370182"><div class="ttname"><a href="classwinapi_1_1Buffer.html#a303645b281fb4f1a4d9e84f1d1370182">winapi::Buffer::add</a></div><div class="ttdeci">void add(const Buffer &src)</div><div class="ttdef"><b>Definition:</b> <a href="buffer_8hpp_source.html#l00079">buffer.hpp:79</a></div></div>
<div class="ttc" id="aclasswinapi_1_1Handle_html"><div class="ttname"><a href="classwinapi_1_1Handle.html">winapi::Handle</a></div><div class="ttdoc">HANDLE wrapper.</div><div class="ttdef"><b>Definition:</b> <a href="handle_8hpp_source.html#l00025">handle.hpp:25</a></div></div>
<div class="ttc" id="aerror_8hpp_html"><div class="ttname"><a href="error_8hpp.html">error.hpp</a></div><div class="ttdoc">Make std::system_error work with GetLastError().</div></div>
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