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<a href="memory__io_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>&#160;</div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="preprocessor">#ifndef DMLC_MEMORY_IO_H_</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="preprocessor">#define DMLC_MEMORY_IO_H_</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;</div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="preprocessor">#include &lt;cstring&gt;</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="preprocessor">#include &lt;string&gt;</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="preprocessor">#include &lt;algorithm&gt;</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="3rdparty_2dmlc-core_2include_2dmlc_2base_8h.html">./base.h</a>&quot;</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="3rdparty_2dmlc-core_2include_2dmlc_2io_8h.html">./io.h</a>&quot;</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="preprocessor">#include &quot;./logging.h&quot;</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;</div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespacedmlc.html">dmlc</a> {</div><div class="line"><a name="l00021"></a><span class="lineno"><a class="line" href="structdmlc_1_1MemoryFixedSizeStream.html"> 21</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structdmlc_1_1MemoryFixedSizeStream.html">MemoryFixedSizeStream</a> : <span class="keyword">public</span> <a class="code" href="classdmlc_1_1SeekStream.html">SeekStream</a> {</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160; <span class="keyword">public</span>:</div><div class="line"><a name="l00028"></a><span class="lineno"><a class="line" href="structdmlc_1_1MemoryFixedSizeStream.html#aa4840e0353338e3906dec45a866e7f4b"> 28</a></span>&#160; <a class="code" href="structdmlc_1_1MemoryFixedSizeStream.html#aa4840e0353338e3906dec45a866e7f4b">MemoryFixedSizeStream</a>(<span class="keywordtype">void</span> *p_buffer, <span class="keywordtype">size_t</span> buffer_size)</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160; : p_buffer_(reinterpret_cast&lt;char*&gt;(p_buffer)),</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160; buffer_size_(buffer_size) {</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160; curr_ptr_ = 0;</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160; }</div><div class="line"><a name="l00033"></a><span class="lineno"><a class="line" href="structdmlc_1_1MemoryFixedSizeStream.html#a04c94431b14d9476f960acc4e29a4fbc"> 33</a></span>&#160; <span class="keyword">virtual</span> <span class="keywordtype">size_t</span> <a class="code" href="structdmlc_1_1MemoryFixedSizeStream.html#a04c94431b14d9476f960acc4e29a4fbc">Read</a>(<span class="keywordtype">void</span> *ptr, <span class="keywordtype">size_t</span> size) {</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160; CHECK(curr_ptr_ + size &lt;= buffer_size_);</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160; <span class="keywordtype">size_t</span> nread = std::min(buffer_size_ - curr_ptr_, size);</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160; <span class="keywordflow">if</span> (nread != 0) std::memcpy(ptr, p_buffer_ + curr_ptr_, nread);</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160; curr_ptr_ += nread;</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160; <span class="keywordflow">return</span> nread;</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160; }</div><div class="line"><a name="l00040"></a><span class="lineno"><a class="line" href="structdmlc_1_1MemoryFixedSizeStream.html#ad654c8490301d8f00a24c5ba95891644"> 40</a></span>&#160; <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="structdmlc_1_1MemoryFixedSizeStream.html#ad654c8490301d8f00a24c5ba95891644">Write</a>(<span class="keyword">const</span> <span class="keywordtype">void</span> *ptr, <span class="keywordtype">size_t</span> size) {</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160; <span class="keywordflow">if</span> (size == 0) <span class="keywordflow">return</span>;</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160; CHECK(curr_ptr_ + size &lt;= buffer_size_);</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160; std::memcpy(p_buffer_ + curr_ptr_, ptr, size);</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160; curr_ptr_ += size;</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160; }</div><div class="line"><a name="l00046"></a><span class="lineno"><a class="line" href="structdmlc_1_1MemoryFixedSizeStream.html#a4b7cd8f8426302b95bac02811cf17cc4"> 46</a></span>&#160; <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="structdmlc_1_1MemoryFixedSizeStream.html#a4b7cd8f8426302b95bac02811cf17cc4">Seek</a>(<span class="keywordtype">size_t</span> pos) {</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; curr_ptr_ = <span class="keyword">static_cast&lt;</span><span class="keywordtype">size_t</span><span class="keyword">&gt;</span>(pos);</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; }</div><div class="line"><a name="l00049"></a><span class="lineno"><a class="line" href="structdmlc_1_1MemoryFixedSizeStream.html#aeb3fd4179c51ec433b10155db53a39f9"> 49</a></span>&#160; <span class="keyword">virtual</span> <span class="keywordtype">size_t</span> <a class="code" href="structdmlc_1_1MemoryFixedSizeStream.html#aeb3fd4179c51ec433b10155db53a39f9">Tell</a>(<span class="keywordtype">void</span>) {</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; <span class="keywordflow">return</span> curr_ptr_;</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; }</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160;</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; <span class="keyword">private</span>:</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; <span class="keywordtype">char</span> *p_buffer_;</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; <span class="keywordtype">size_t</span> buffer_size_;</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; <span class="keywordtype">size_t</span> curr_ptr_;</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160;}; <span class="comment">// class MemoryFixedSizeStream</span></div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160;</div><div class="line"><a name="l00066"></a><span class="lineno"><a class="line" href="structdmlc_1_1MemoryStringStream.html"> 66</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structdmlc_1_1MemoryStringStream.html">MemoryStringStream</a> : <span class="keyword">public</span> <a class="code" href="classdmlc_1_1SeekStream.html">dmlc::SeekStream</a> {</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; <span class="keyword">public</span>:</div><div class="line"><a name="l00072"></a><span class="lineno"><a class="line" href="structdmlc_1_1MemoryStringStream.html#aef4fbe441bfb50d46c7a761d55bcad9b"> 72</a></span>&#160; <span class="keyword">explicit</span> <a class="code" href="structdmlc_1_1MemoryStringStream.html#aef4fbe441bfb50d46c7a761d55bcad9b">MemoryStringStream</a>(std::string *p_buffer)</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; : p_buffer_(p_buffer) {</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; curr_ptr_ = 0;</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; }</div><div class="line"><a name="l00076"></a><span class="lineno"><a class="line" href="structdmlc_1_1MemoryStringStream.html#a3f297018b59227d2a318c88f1a8d1170"> 76</a></span>&#160; <span class="keyword">virtual</span> <span class="keywordtype">size_t</span> <a class="code" href="structdmlc_1_1MemoryStringStream.html#a3f297018b59227d2a318c88f1a8d1170">Read</a>(<span class="keywordtype">void</span> *ptr, <span class="keywordtype">size_t</span> size) {</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; CHECK(curr_ptr_ &lt;= p_buffer_-&gt;length());</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; <span class="keywordtype">size_t</span> nread = std::min(p_buffer_-&gt;length() - curr_ptr_, size);</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; <span class="keywordflow">if</span> (nread != 0) std::memcpy(ptr, &amp;(*p_buffer_)[0] + curr_ptr_, nread);</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160; curr_ptr_ += nread;</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160; <span class="keywordflow">return</span> nread;</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160; }</div><div class="line"><a name="l00083"></a><span class="lineno"><a class="line" href="structdmlc_1_1MemoryStringStream.html#a4044c0c29db112f5b8ae79c6e7d2367e"> 83</a></span>&#160; <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="structdmlc_1_1MemoryStringStream.html#a4044c0c29db112f5b8ae79c6e7d2367e">Write</a>(<span class="keyword">const</span> <span class="keywordtype">void</span> *ptr, <span class="keywordtype">size_t</span> size) {</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160; <span class="keywordflow">if</span> (size == 0) <span class="keywordflow">return</span>;</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160; <span class="keywordflow">if</span> (curr_ptr_ + size &gt; p_buffer_-&gt;length()) {</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160; p_buffer_-&gt;resize(curr_ptr_+size);</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; }</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160; std::memcpy(&amp;(*p_buffer_)[0] + curr_ptr_, ptr, size);</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160; curr_ptr_ += size;</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; }</div><div class="line"><a name="l00091"></a><span class="lineno"><a class="line" href="structdmlc_1_1MemoryStringStream.html#a23d8c9a8093140dcd48e38aacb42aebc"> 91</a></span>&#160; <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="structdmlc_1_1MemoryStringStream.html#a23d8c9a8093140dcd48e38aacb42aebc">Seek</a>(<span class="keywordtype">size_t</span> pos) {</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; curr_ptr_ = <span class="keyword">static_cast&lt;</span><span class="keywordtype">size_t</span><span class="keyword">&gt;</span>(pos);</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; }</div><div class="line"><a name="l00094"></a><span class="lineno"><a class="line" href="structdmlc_1_1MemoryStringStream.html#ab866a255b07b9ac1acec55ea4896a084"> 94</a></span>&#160; <span class="keyword">virtual</span> <span class="keywordtype">size_t</span> <a class="code" href="structdmlc_1_1MemoryStringStream.html#ab866a255b07b9ac1acec55ea4896a084">Tell</a>(<span class="keywordtype">void</span>) {</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; <span class="keywordflow">return</span> curr_ptr_;</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160; }</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160;</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; <span class="keyword">private</span>:</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; std::string *p_buffer_;</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; <span class="keywordtype">size_t</span> curr_ptr_;</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160;}; <span class="comment">// class MemoryStringStream</span></div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160;} <span class="comment">// namespace dmlc</span></div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160;<span class="preprocessor">#endif // DMLC_MEMORY_IO_H_</span></div><div class="ttc" id="structdmlc_1_1MemoryFixedSizeStream_html_a4b7cd8f8426302b95bac02811cf17cc4"><div class="ttname"><a href="structdmlc_1_1MemoryFixedSizeStream.html#a4b7cd8f8426302b95bac02811cf17cc4">dmlc::MemoryFixedSizeStream::Seek</a></div><div class="ttdeci">virtual void Seek(size_t pos)</div><div class="ttdoc">seek to certain position of the file </div><div class="ttdef"><b>Definition:</b> memory_io.h:46</div></div>
<div class="ttc" id="structdmlc_1_1MemoryFixedSizeStream_html_ad654c8490301d8f00a24c5ba95891644"><div class="ttname"><a href="structdmlc_1_1MemoryFixedSizeStream.html#ad654c8490301d8f00a24c5ba95891644">dmlc::MemoryFixedSizeStream::Write</a></div><div class="ttdeci">virtual void Write(const void *ptr, size_t size)</div><div class="ttdoc">writes data to a stream </div><div class="ttdef"><b>Definition:</b> memory_io.h:40</div></div>
<div class="ttc" id="structdmlc_1_1MemoryStringStream_html_a23d8c9a8093140dcd48e38aacb42aebc"><div class="ttname"><a href="structdmlc_1_1MemoryStringStream.html#a23d8c9a8093140dcd48e38aacb42aebc">dmlc::MemoryStringStream::Seek</a></div><div class="ttdeci">virtual void Seek(size_t pos)</div><div class="ttdoc">seek to certain position of the file </div><div class="ttdef"><b>Definition:</b> memory_io.h:91</div></div>
<div class="ttc" id="structdmlc_1_1MemoryFixedSizeStream_html_aa4840e0353338e3906dec45a866e7f4b"><div class="ttname"><a href="structdmlc_1_1MemoryFixedSizeStream.html#aa4840e0353338e3906dec45a866e7f4b">dmlc::MemoryFixedSizeStream::MemoryFixedSizeStream</a></div><div class="ttdeci">MemoryFixedSizeStream(void *p_buffer, size_t buffer_size)</div><div class="ttdoc">constructor </div><div class="ttdef"><b>Definition:</b> memory_io.h:28</div></div>
<div class="ttc" id="structdmlc_1_1MemoryStringStream_html"><div class="ttname"><a href="structdmlc_1_1MemoryStringStream.html">dmlc::MemoryStringStream</a></div><div class="ttdoc">A in memory stream that is backed by std::string. This class allows us to read/write from/to a std::s...</div><div class="ttdef"><b>Definition:</b> memory_io.h:66</div></div>
<div class="ttc" id="structdmlc_1_1MemoryStringStream_html_a4044c0c29db112f5b8ae79c6e7d2367e"><div class="ttname"><a href="structdmlc_1_1MemoryStringStream.html#a4044c0c29db112f5b8ae79c6e7d2367e">dmlc::MemoryStringStream::Write</a></div><div class="ttdeci">virtual void Write(const void *ptr, size_t size)</div><div class="ttdoc">writes data to a stream </div><div class="ttdef"><b>Definition:</b> memory_io.h:83</div></div>
<div class="ttc" id="namespacedmlc_html"><div class="ttname"><a href="namespacedmlc.html">dmlc</a></div><div class="ttdoc">namespace for dmlc </div><div class="ttdef"><b>Definition:</b> array_view.h:12</div></div>
<div class="ttc" id="structdmlc_1_1MemoryFixedSizeStream_html_a04c94431b14d9476f960acc4e29a4fbc"><div class="ttname"><a href="structdmlc_1_1MemoryFixedSizeStream.html#a04c94431b14d9476f960acc4e29a4fbc">dmlc::MemoryFixedSizeStream::Read</a></div><div class="ttdeci">virtual size_t Read(void *ptr, size_t size)</div><div class="ttdoc">reads data from a stream </div><div class="ttdef"><b>Definition:</b> memory_io.h:33</div></div>
<div class="ttc" id="structdmlc_1_1MemoryFixedSizeStream_html_aeb3fd4179c51ec433b10155db53a39f9"><div class="ttname"><a href="structdmlc_1_1MemoryFixedSizeStream.html#aeb3fd4179c51ec433b10155db53a39f9">dmlc::MemoryFixedSizeStream::Tell</a></div><div class="ttdeci">virtual size_t Tell(void)</div><div class="ttdoc">tell the position of the stream </div><div class="ttdef"><b>Definition:</b> memory_io.h:49</div></div>
<div class="ttc" id="3rdparty_2dmlc-core_2include_2dmlc_2io_8h_html"><div class="ttname"><a href="3rdparty_2dmlc-core_2include_2dmlc_2io_8h.html">io.h</a></div></div>
<div class="ttc" id="classdmlc_1_1SeekStream_html"><div class="ttname"><a href="classdmlc_1_1SeekStream.html">dmlc::SeekStream</a></div><div class="ttdoc">interface of i/o stream that support seek </div><div class="ttdef"><b>Definition:</b> io.h:109</div></div>
<div class="ttc" id="3rdparty_2dmlc-core_2include_2dmlc_2base_8h_html"><div class="ttname"><a href="3rdparty_2dmlc-core_2include_2dmlc_2base_8h.html">base.h</a></div></div>
<div class="ttc" id="structdmlc_1_1MemoryStringStream_html_ab866a255b07b9ac1acec55ea4896a084"><div class="ttname"><a href="structdmlc_1_1MemoryStringStream.html#ab866a255b07b9ac1acec55ea4896a084">dmlc::MemoryStringStream::Tell</a></div><div class="ttdeci">virtual size_t Tell(void)</div><div class="ttdoc">tell the position of the stream </div><div class="ttdef"><b>Definition:</b> memory_io.h:94</div></div>
<div class="ttc" id="structdmlc_1_1MemoryStringStream_html_a3f297018b59227d2a318c88f1a8d1170"><div class="ttname"><a href="structdmlc_1_1MemoryStringStream.html#a3f297018b59227d2a318c88f1a8d1170">dmlc::MemoryStringStream::Read</a></div><div class="ttdeci">virtual size_t Read(void *ptr, size_t size)</div><div class="ttdoc">reads data from a stream </div><div class="ttdef"><b>Definition:</b> memory_io.h:76</div></div>
<div class="ttc" id="structdmlc_1_1MemoryFixedSizeStream_html"><div class="ttname"><a href="structdmlc_1_1MemoryFixedSizeStream.html">dmlc::MemoryFixedSizeStream</a></div><div class="ttdoc">A Stream that operates on fixed region of memory This class allows us to read/write from/to a fixed m...</div><div class="ttdef"><b>Definition:</b> memory_io.h:21</div></div>
<div class="ttc" id="structdmlc_1_1MemoryStringStream_html_aef4fbe441bfb50d46c7a761d55bcad9b"><div class="ttname"><a href="structdmlc_1_1MemoryStringStream.html#aef4fbe441bfb50d46c7a761d55bcad9b">dmlc::MemoryStringStream::MemoryStringStream</a></div><div class="ttdeci">MemoryStringStream(std::string *p_buffer)</div><div class="ttdoc">constructor </div><div class="ttdef"><b>Definition:</b> memory_io.h:72</div></div>
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