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Posted to commits@arrow.apache.org by we...@apache.org on 2018/01/17 04:45:10 UTC
[29/51] [partial] arrow-site git commit: Add updated API docs for
0.8.0
http://git-wip-us.apache.org/repos/asf/arrow-site/blob/a6214c73/docs/cpp/bit-stream-utils_8h_source.html
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diff --git a/docs/cpp/bit-stream-utils_8h_source.html b/docs/cpp/bit-stream-utils_8h_source.html
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+++ b/docs/cpp/bit-stream-utils_8h_source.html
@@ -3,7 +3,7 @@
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<title>Apache Arrow (C++): /apache-arrow/arrow/cpp/src/arrow/util/bit-stream-utils.h Source File</title>
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@@ -30,18 +30,21 @@
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-<!-- Generated by Doxygen 1.8.13 -->
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@@ -67,7 +70,7 @@ $(function() {
<div class="title">bit-stream-utils.h</div> </div>
</div><!--header-->
<div class="contents">
-<a href="bit-stream-utils_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">// Licensed to the Apache Software Foundation (ASF) under one</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// or more contributor license agreements. See the NOTICE file</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// distributed with this work for additional information</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// regarding copyright ownership. The ASF licenses this file</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// to you under the Apache License, Version 2.0 (the</span></div><div class="line"><a name="l00006"></a><s
pan class="lineno"> 6</span> <span class="comment">// "License"); you may not use this file except in compliance</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// with the License. You may obtain a copy of the License at</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">//</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</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">// Unless required by applicable law or agreed to in writing,</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// software dist
ributed under the License is distributed on an</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">// KIND, either express or implied. See the License for the</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment">// specific language governing permissions and limitations</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">// under the License.</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> </div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">// From Apache Impala (incubating) as of 2016-01-29</span></div><div class="line"><a name="l0001
9"></a><span class="lineno"> 19</span> </div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#ifndef ARROW_UTIL_BIT_STREAM_UTILS_H</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#define ARROW_UTIL_BIT_STREAM_UTILS_H</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> <span class="preprocessor">#include <<a class="code" href="string_8h.html">string.h</a>></span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include <algorithm></span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include <cstdint></span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> </
div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#include "<a class="code" href="bit-util_8h.html">arrow/util/bit-util.h</a>"</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#include "<a class="code" href="bpacking_8h.html">arrow/util/bpacking.h</a>"</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#include "<a class="code" href="logging_8h.html">arrow/util/logging.h</a>"</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#include "<a class="code" href="macros_8h.html">arrow/util/macros.h</a>"</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> <span class="keyword"
>namespace </span><a class="code" href="namespacearrow.html">arrow</a> {</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div><div class="line"><a name="l00037"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_writer.html"> 37</a></span> <span class="keyword">class </span><a class="code" href="classarrow_1_1_bit_writer.html">BitWriter</a> {</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00041"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_writer.html#a0462b6eb15d93162ee7d2c828309d612"> 41</a></span>  <a class="code" href="classarrow_1_1_bit_writer.html#a0462b6eb15d93162ee7d2c828309d612">BitWriter</a>(uint8_t* <a class="code" href="classarrow_1_1_bit_writer.html#a9d33b2acbd9fca179863fcde288a079d">buffer</a>, <span class="keywordtype">int</span> <a class="code" href="classarrow_1_1_bit_writer.
html#a5592cdd1db11520ea5ae0be95fb4732a">buffer_len</a>) : buffer_(buffer), max_bytes_(buffer_len) {</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <a class="code" href="classarrow_1_1_bit_writer.html#a324ef275bfbcb49d823aa4fbced24446">Clear</a>();</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  }</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> </div><div class="line"><a name="l00045"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_writer.html#a324ef275bfbcb49d823aa4fbced24446"> 45</a></span>  <span class="keywordtype">void</span> <a class="code" href="classarrow_1_1_bit_writer.html#a324ef275bfbcb49d823aa4fbced24446">Clear</a>() {</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  buffered_values_ = 0;</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  byte_offset_ = 0;</div><d
iv class="line"><a name="l00048"></a><span class="lineno"> 48</span>  bit_offset_ = 0;</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="l00053"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_writer.html#a73de4690985f7274c69b6dba99922743"> 53</a></span>  <span class="keywordtype">int</span> <a class="code" href="classarrow_1_1_bit_writer.html#a73de4690985f7274c69b6dba99922743">bytes_written</a>()<span class="keyword"> const </span>{</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordflow">return</span> byte_offset_ + <span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(BitUtil::Ceil(bit_offset_, 8));</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> 
; }</div><div class="line"><a name="l00056"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_writer.html#a9d33b2acbd9fca179863fcde288a079d"> 56</a></span>  uint8_t* <a class="code" href="classarrow_1_1_bit_writer.html#a9d33b2acbd9fca179863fcde288a079d">buffer</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> buffer_; }</div><div class="line"><a name="l00057"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_writer.html#a5592cdd1db11520ea5ae0be95fb4732a"> 57</a></span>  <span class="keywordtype">int</span> <a class="code" href="classarrow_1_1_bit_writer.html#a5592cdd1db11520ea5ae0be95fb4732a">buffer_len</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> max_bytes_; }</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> </div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordtype">bool</span>
<a class="code" href="classarrow_1_1_bit_writer.html#a407df208444d95e50d5ec6c608104cda">PutValue</a>(uint64_t v, <span class="keywordtype">int</span> num_bits);</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> T></div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordtype">bool</span> <a class="code" href="classarrow_1_1_bit_writer.html#aa76314faef71d7ad351dbd3f16c84fc0">PutAligned</a>(T v, <span class="keywordtype">int</span> num_bytes);</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> </div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordtype">bool</span> <a class="code" href="classarrow_1_1_bit_writer.html#a028f9d7d77697df651ef82d2df52f53d">PutVlq
Int</a>(uint32_t v);</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="comment">// Writes an int zigzag encoded.</span></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keywordtype">bool</span> <a class="code" href="classarrow_1_1_bit_writer.html#a2e764de1162c33a6aa41caad00322156">PutZigZagVlqInt</a>(int32_t v);</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  uint8_t* <a class="code" href="classarrow_1_1_bit_writer.html#a2d5943b81c4340b54bfd019955a7d959">GetNextBytePtr</a>(<span class="keywordtype">int</span> num_bytes = 1);</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> </div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>
60; <span class="keywordtype">void</span> <a class="code" href="classarrow_1_1_bit_writer.html#a869a43c7c8006e1658fd4ae44a92e347">Flush</a>(<span class="keywordtype">bool</span> align = <span class="keyword">false</span>);</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="keyword">private</span>:</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  uint8_t* buffer_;</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordtype">int</span> max_bytes_;</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> </div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  uint64_t buffered_values_;</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="keywordtype">int</span> byte_offset_; <span class="comment">// Offset in buffer_</span></div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keywordtype">int</span> bit_offset_; <span class="comment">// Offset in buffered_values_</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"> 99</span> </div><div class="line"><a name="l00103"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_reader.html"> 103</a></span> <span class="keyword">class </span><a class="code" href="classarrow_1_1_bit_reader.html">BitReader</a> {</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00106"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_reader.html#a714971e1
3b725100437484becf9b8ae4"> 106</a></span>  <a class="code" href="classarrow_1_1_bit_reader.html#a714971e13b725100437484becf9b8ae4">BitReader</a>(<span class="keyword">const</span> uint8_t* <a class="code" href="classarrow_1_1_bit_writer.html#a9d33b2acbd9fca179863fcde288a079d">buffer</a>, <span class="keywordtype">int</span> <a class="code" href="classarrow_1_1_bit_writer.html#a5592cdd1db11520ea5ae0be95fb4732a">buffer_len</a>)</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  : buffer_(buffer), max_bytes_(buffer_len), byte_offset_(0), bit_offset_(0) {</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordtype">int</span> num_bytes = std::min(8, max_bytes_ - byte_offset_);</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  memcpy(&buffered_values_, buffer_ + byte_offset_, num_bytes);</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> </div><div class="line"><a name="l00112"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_reader.html#a59f592e16907128787dfaa8c7cfa839e"> 112</a></span>  <a class="code" href="classarrow_1_1_bit_reader.html#a59f592e16907128787dfaa8c7cfa839e">BitReader</a>() : buffer_(NULL), max_bytes_(0) {}</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span> </div><div class="line"><a name="l00114"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_reader.html#aaaefbf3fa141ce764cda52c0e1e55103"> 114</a></span>  <span class="keywordtype">void</span> <a class="code" href="classarrow_1_1_bit_reader.html#aaaefbf3fa141ce764cda52c0e1e55103">Reset</a>(<span class="keyword">const</span> uint8_t* <a class="code" href="classarrow_1_1_bit_writer.html#a9d33b2acbd9fca179863fcde288a079d">buffer</a>, <span class="keywordtype">int</span
> <a class="code" href="classarrow_1_1_bit_writer.html#a5592cdd1db11520ea5ae0be95fb4732a">buffer_len</a>) {</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  buffer_ = <a class="code" href="classarrow_1_1_bit_writer.html#a9d33b2acbd9fca179863fcde288a079d">buffer</a>;</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  max_bytes_ = <a class="code" href="classarrow_1_1_bit_writer.html#a5592cdd1db11520ea5ae0be95fb4732a">buffer_len</a>;</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  byte_offset_ = 0;</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  bit_offset_ = 0;</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keywordtype">int</span> num_bytes = std::min(8, max_bytes_ - byte_offset_);</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  memcpy(&buff
ered_values_, buffer_ + byte_offset_, num_bytes);</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  }</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span> </div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> T></div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordtype">bool</span> GetValue(<span class="keywordtype">int</span> num_bits, T* v);</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span> </div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> T></div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordtype">int</span> GetBatch(<span class="keywordtype">int</sp
an> num_bits, T* v, <span class="keywordtype">int</span> batch_size);</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span> </div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> T></div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keywordtype">bool</span> GetAligned(<span class="keywordtype">int</span> num_bytes, T* v);</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span> </div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="keywordtype">bool</span> GetVlqInt(int32_t* v);</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="comment">// Reads a zigzag encoded int `into` v.</span></div><div class
="line"><a name="l00146"></a><span class="lineno"> 146</span>  <span class="keywordtype">bool</span> GetZigZagVlqInt(int32_t* v);</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span> </div><div class="line"><a name="l00150"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_reader.html#a943f521c4855e418bc106e55fd2de8d3"> 150</a></span>  <span class="keywordtype">int</span> <a class="code" href="classarrow_1_1_bit_reader.html#a943f521c4855e418bc106e55fd2de8d3">bytes_left</a>() {</div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="keywordflow">return</span> max_bytes_ - (byte_offset_ + <span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(BitUtil::Ceil(bit_offset_, 8)));</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> </div><div class="line"><a name="l00155"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_reader.html#aa5953074578c6d5e068574ab4ccb3e35"> 155</a></span>  <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> MAX_VLQ_BYTE_LEN = 5;</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>  <span class="keyword">private</span>:</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <span class="keyword">const</span> uint8_t* buffer_;</div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="keywordtype">int</span> max_bytes_;</div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span> </div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  uint64_t buffered_values
_;</div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span> </div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="keywordtype">int</span> byte_offset_; <span class="comment">// Offset in buffer_</span></div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="keywordtype">int</span> bit_offset_; <span class="comment">// Offset in buffered_values_</span></div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span> };</div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span> </div><div class="line"><a name="l00169"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_writer.html#a407df208444d95e50d5ec6c608104cda"> 169</a></span> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="classarrow_1_1_bit_writer.html#a407df208444d95e50d5ec6c608104cda">BitWriter::PutValue<
/a>(uint64_t v, <span class="keywordtype">int</span> num_bits) {</div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="comment">// TODO: revisit this limit if necessary (can be raised to 64 by fixing some edge cases)</span></div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <a class="code" href="logging_8h.html#a4395e95bab44e222cb2e77251017a0e2">DCHECK_LE</a>(num_bits, 32);</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <a class="code" href="logging_8h.html#ae89df3243bbb8341130c7b3f44145ea0">DCHECK_EQ</a>(v >> num_bits, 0) << <span class="stringliteral">"v = "</span> << v << <span class="stringliteral">", num_bits = "</span> << num_bits;</div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span> </div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="key
wordflow">if</span> (<a class="code" href="macros_8h.html#a6f2ee7ad52872edb915cf48e163ac99c">ARROW_PREDICT_FALSE</a>(byte_offset_ * 8 + bit_offset_ + num_bits > max_bytes_ * 8))</div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="keywordflow">return</span> <span class="keyword">false</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>  buffered_values_ |= v << bit_offset_;</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  bit_offset_ += num_bits;</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span> </div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="keywordflow">if</span> (<a class="code" href="macros_8h.html#a6f2ee7ad52872edb915cf48e163ac99c">ARROW_PREDICT_FALSE</a>(bit_offset_ >= 64)) {</di
v><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="comment">// Flush buffered_values_ and write out bits of v that did not fit</span></div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  memcpy(buffer_ + byte_offset_, &buffered_values_, 8);</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  buffered_values_ = 0;</div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  byte_offset_ += 8;</div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  bit_offset_ -= 64;</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  buffered_values_ = v >> (num_bits - bit_offset_);</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>  <a class="code" href="logging_8h.htm
l#ab62f5ed8f2d48e29802be0cbbcd1359a">DCHECK_LT</a>(bit_offset_, 64);</div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span> }</div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span> </div><div class="line"><a name="l00192"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_writer.html#a869a43c7c8006e1658fd4ae44a92e347"> 192</a></span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classarrow_1_1_bit_writer.html#a869a43c7c8006e1658fd4ae44a92e347">BitWriter::Flush</a>(<span class="keywordtype">bool</span> align) {</div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  <span class="keywordtype">int</span> num_bytes = <span class="keyword">static_cast<</span><span class="key
wordtype">int</span><span class="keyword">></span>(BitUtil::Ceil(bit_offset_, 8));</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  <a class="code" href="logging_8h.html#a4395e95bab44e222cb2e77251017a0e2">DCHECK_LE</a>(byte_offset_ + num_bytes, max_bytes_);</div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  memcpy(buffer_ + byte_offset_, &buffered_values_, num_bytes);</div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span> </div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="keywordflow">if</span> (align) {</div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  buffered_values_ = 0;</div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  byte_offset_ += num_bytes;</div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  bit_offset_ = 0;</div><d
iv class="line"><a name="l00201"></a><span class="lineno"> 201</span>  }</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"><a class="line" href="classarrow_1_1_bit_writer.html#a2d5943b81c4340b54bfd019955a7d959"> 204</a></span> <span class="keyword">inline</span> uint8_t* <a class="code" href="classarrow_1_1_bit_writer.html#a2d5943b81c4340b54bfd019955a7d959">BitWriter::GetNextBytePtr</a>(<span class="keywordtype">int</span> num_bytes) {</div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  <a class="code" href="classarrow_1_1_bit_writer.html#a869a43c7c8006e1658fd4ae44a92e347">Flush</a>(<span class="comment">/* align */</span> <span class="keyword">true</span>);</div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <a class="code"
href="logging_8h.html#a4395e95bab44e222cb2e77251017a0e2">DCHECK_LE</a>(byte_offset_, max_bytes_);</div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <span class="keywordflow">if</span> (byte_offset_ + num_bytes > max_bytes_) <span class="keywordflow">return</span> NULL;</div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  uint8_t* ptr = buffer_ + byte_offset_;</div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  byte_offset_ += num_bytes;</div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="keywordflow">return</span> ptr;</div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span> }</div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span> </div><div class="line"><a name="l00213"></a><span class="lineno"> 213</span> <span class="keyword">template</span> <<span class="keyword">typena
me</span> T></div><div class="line"><a name="l00214"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_writer.html#aa76314faef71d7ad351dbd3f16c84fc0"> 214</a></span> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="classarrow_1_1_bit_writer.html#aa76314faef71d7ad351dbd3f16c84fc0">BitWriter::PutAligned</a>(T val, <span class="keywordtype">int</span> num_bytes) {</div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  uint8_t* ptr = <a class="code" href="classarrow_1_1_bit_writer.html#a2d5943b81c4340b54bfd019955a7d959">GetNextBytePtr</a>(num_bytes);</div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="keywordflow">if</span> (ptr == NULL) <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  memcpy(ptr, &val, num_bytes);</div><div cl
ass="line"><a name="l00218"></a><span class="lineno"> 218</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</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"><a class="line" href="classarrow_1_1_bit_writer.html#a028f9d7d77697df651ef82d2df52f53d"> 221</a></span> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="classarrow_1_1_bit_writer.html#a028f9d7d77697df651ef82d2df52f53d">BitWriter::PutVlqInt</a>(uint32_t v) {</div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  <span class="keywordtype">bool</span> result = <span class="keyword">true</span>;</div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <span class="keywordflow">while</span> ((v & 0xF
FFFFF80) != 0L) {</div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  result &= PutAligned<uint8_t>(<span class="keyword">static_cast<</span>uint8_t<span class="keyword">></span>((v & 0x7F) | 0x80), 1);</div><div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  v >>= 7;</div><div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  }</div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  result &= PutAligned<uint8_t>(<span class="keyword">static_cast<</span>uint8_t<span class="keyword">></span>(v & 0x7F), 1);</div><div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  <span class="keywordflow">return</span> result;</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> </div><div class="li
ne"><a name="l00231"></a><span class="lineno"> 231</span> <span class="keyword">namespace </span>detail {</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> T></div><div class="line"><a name="l00234"></a><span class="lineno"> 234</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> GetValue_(<span class="keywordtype">int</span> num_bits, T* v, <span class="keywordtype">int</span> max_bytes, <span class="keyword">const</span> uint8_t* <a class="code" href="classarrow_1_1_bit_writer.html#a9d33b2acbd9fca179863fcde288a079d">buffer</a>,</div><div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  <span class="keywordtype">int</span>* bit_offset, <span class="keywordtype">int</span>* byte_offset, uint64_t* buff
ered_values) {</div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span> <span class="preprocessor">#ifdef _MSC_VER</span></div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span> <span class="preprocessor">#pragma warning(push)</span></div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span> <span class="preprocessor">#pragma warning(disable : 4800)</span></div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  *v = <span class="keyword">static_cast<</span>T<span class="keyword">></span>(BitUtil::TrailingBits(*buffered_values, *bit_offset + num_bits) >></div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  *bit_offset);</div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span
> <span class="preprocessor">#ifdef _MSC_VER</span></div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span> <span class="preprocessor">#pragma warning(pop)</span></div><div class="line"><a name="l00244"></a><span class="lineno"> 244</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  *bit_offset += num_bits;</div><div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  <span class="keywordflow">if</span> (*bit_offset >= 64) {</div><div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  *byte_offset += 8;</div><div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  *bit_offset -= 64;</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>  <span class="keywordtype">int</span> by
tes_remaining = max_bytes - *byte_offset;</div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  <span class="keywordflow">if</span> (<a class="code" href="macros_8h.html#a1f418a9edc46d53e62732e7ccd06f329">ARROW_PREDICT_TRUE</a>(bytes_remaining >= 8)) {</div><div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  memcpy(buffered_values, buffer + *byte_offset, 8);</div><div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  memcpy(buffered_values, buffer + *byte_offset, bytes_remaining);</div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  }</div><div class="line"><a name="l00256"></a><span class="lineno"> 256</span> <span class="preprocessor">#ifdef _MSC_VER</span></div><div class="line"><a name="l00257"></a><span class="lineno
"> 257</span> <span class="preprocessor">#pragma warning(push)</span></div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span> <span class="preprocessor">#pragma warning(disable : 4800 4805)</span></div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  <span class="comment">// Read bits of v that crossed into new buffered_values_</span></div><div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  *v = *v | <span class="keyword">static_cast<</span>T<span class="keyword">></span>(BitUtil::TrailingBits(*buffered_values, *bit_offset)</div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  << (num_bits - *bit_offset));</div><div class="line"><a name="l00263"></a><span class="lineno"> 263</span> <span clas
s="preprocessor">#ifdef _MSC_VER</span></div><div class="line"><a name="l00264"></a><span class="lineno"> 264</span> <span class="preprocessor">#pragma warning(pop)</span></div><div class="line"><a name="l00265"></a><span class="lineno"> 265</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  <a class="code" href="logging_8h.html#a4395e95bab44e222cb2e77251017a0e2">DCHECK_LE</a>(*bit_offset, 64);</div><div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  }</div><div class="line"><a name="l00268"></a><span class="lineno"> 268</span> }</div><div class="line"><a name="l00269"></a><span class="lineno"> 269</span> </div><div class="line"><a name="l00270"></a><span class="lineno"> 270</span> } <span class="comment">// namespace detail</span></div><div class="line"><a name="l00271"></a><span class="lineno"> 271</span> </div><div class="line"><a na
me="l00272"></a><span class="lineno"> 272</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T></div><div class="line"><a name="l00273"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_reader.html#a20420d2374d3eb9177c5c3a0f5493cd1"> 273</a></span> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="classarrow_1_1_bit_reader.html#a20420d2374d3eb9177c5c3a0f5493cd1">BitReader::GetValue</a>(<span class="keywordtype">int</span> num_bits, T* v) {</div><div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="keywordflow">return</span> GetBatch(num_bits, v, 1) == 1;</div><div class="line"><a name="l00275"></a><span class="lineno"> 275</span> }</div><div class="line"><a name="l00276"></a><span class="lineno"> 276</span> </div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span> <span class="keyword">template</
span> <<span class="keyword">typename</span> T></div><div class="line"><a name="l00278"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_reader.html#a6f023d4ce78bd6a9cbc2f372f441d964"> 278</a></span> <span class="keyword">inline</span> <span class="keywordtype">int</span> <a class="code" href="classarrow_1_1_bit_reader.html#a6f023d4ce78bd6a9cbc2f372f441d964">BitReader::GetBatch</a>(<span class="keywordtype">int</span> num_bits, T* v, <span class="keywordtype">int</span> batch_size) {</div><div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  <a class="code" href="logging_8h.html#ae17f8119c108cf3070bad3449c7e0006">DCHECK</a>(buffer_ != NULL);</div><div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <span class="comment">// TODO: revisit this limit if necessary</span></div><div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  <a class="code" href="logging_8h.html#a4395e95bab44e
222cb2e77251017a0e2">DCHECK_LE</a>(num_bits, 32);</div><div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  <a class="code" href="logging_8h.html#a4395e95bab44e222cb2e77251017a0e2">DCHECK_LE</a>(num_bits, static_cast<int>(<span class="keyword">sizeof</span>(T) * 8));</div><div class="line"><a name="l00283"></a><span class="lineno"> 283</span> </div><div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  <span class="keywordtype">int</span> bit_offset = bit_offset_;</div><div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  <span class="keywordtype">int</span> byte_offset = byte_offset_;</div><div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  uint64_t buffered_values = buffered_values_;</div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  <span class="keywordtype">int</span> max_bytes = max_bytes_;</div><div class="line"><a name="l00288
"></a><span class="lineno"> 288</span>  <span class="keyword">const</span> uint8_t* <a class="code" href="classarrow_1_1_bit_writer.html#a9d33b2acbd9fca179863fcde288a079d">buffer</a> = buffer_;</div><div class="line"><a name="l00289"></a><span class="lineno"> 289</span> </div><div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  uint64_t needed_bits = num_bits * batch_size;</div><div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  uint64_t remaining_bits = (max_bytes - byte_offset) * 8 - bit_offset;</div><div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  <span class="keywordflow">if</span> (remaining_bits < needed_bits) {</div><div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  batch_size = <span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(remaining_bits) / num_bits;</div><div class="line"><a n
ame="l00294"></a><span class="lineno"> 294</span>  }</div><div class="line"><a name="l00295"></a><span class="lineno"> 295</span> </div><div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  <span class="keywordtype">int</span> i = 0;</div><div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  <span class="keywordflow">if</span> (<a class="code" href="macros_8h.html#a6f2ee7ad52872edb915cf48e163ac99c">ARROW_PREDICT_FALSE</a>(bit_offset != 0)) {</div><div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  <span class="keywordflow">for</span> (; i < batch_size && bit_offset != 0; ++i) {</div><div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  detail::GetValue_(num_bits, &v[i], max_bytes, buffer, &bit_offset, &byte_offset,</div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  &buffered_val
ues);</div><div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  }</div><div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  }</div><div class="line"><a name="l00303"></a><span class="lineno"> 303</span> </div><div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  <span class="keywordflow">if</span> (<span class="keyword">sizeof</span>(T) == 4) {</div><div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  <span class="keywordtype">int</span> num_unpacked =</div><div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  internal::unpack32(reinterpret_cast<const uint32_t*>(buffer + byte_offset),</div><div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  reinterpret_cast<uint32_t*>(v + i), batch_size - i, num_bits);</div><div class="line"><a name="l00308"></a><span class="lineno"> 308<
/span>  i += num_unpacked;</div><div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  byte_offset += num_unpacked * num_bits / 8;</div><div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  <span class="keyword">const</span> <span class="keywordtype">int</span> buffer_size = 1024;</div><div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  uint32_t unpack_buffer[buffer_size];</div><div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  <span class="keywordflow">while</span> (i < batch_size) {</div><div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  <span class="keywordtype">int</span> unpack_size = std::min(buffer_size, batch_size - i);</div><div class="line"><a name="l00315"></a><span class="lineno"> 315</sp
an>  <span class="keywordtype">int</span> num_unpacked =</div><div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  internal::unpack32(reinterpret_cast<const uint32_t*>(buffer + byte_offset),</div><div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  unpack_buffer, unpack_size, num_bits);</div><div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  <span class="keywordflow">if</span> (num_unpacked == 0) {</div><div class="line"><a name="l00319"></a><span class="lineno"> 319</span>  <span class="keywordflow">break</span>;</div><div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  }</div><div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> k = 0; k < num_unpacked; ++k) {</div><div class="line"><a name="l003
22"></a><span class="lineno"> 322</span> <span class="preprocessor">#ifdef _MSC_VER</span></div><div class="line"><a name="l00323"></a><span class="lineno"> 323</span> <span class="preprocessor">#pragma warning(push)</span></div><div class="line"><a name="l00324"></a><span class="lineno"> 324</span> <span class="preprocessor">#pragma warning(disable : 4800)</span></div><div class="line"><a name="l00325"></a><span class="lineno"> 325</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  v[i + k] = <span class="keyword">static_cast<</span>T<span class="keyword">></span>(unpack_buffer[k]);</div><div class="line"><a name="l00327"></a><span class="lineno"> 327</span> <span class="preprocessor">#ifdef _MSC_VER</span></div><div class="line"><a name="l00328"></a><span class="lineno"> 328</span> <span class="preprocessor">#pragma warning(pop)</span></div><div class="
line"><a name="l00329"></a><span class="lineno"> 329</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00330"></a><span class="lineno"> 330</span>  }</div><div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  i += num_unpacked;</div><div class="line"><a name="l00332"></a><span class="lineno"> 332</span>  byte_offset += num_unpacked * num_bits / 8;</div><div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  }</div><div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  }</div><div class="line"><a name="l00335"></a><span class="lineno"> 335</span> </div><div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  <span class="keywordtype">int</span> bytes_remaining = max_bytes - byte_offset;</div><div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  <span class="keywordflow">if</span> (bytes_remai
ning >= 8) {</div><div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  memcpy(&buffered_values, buffer + byte_offset, 8);</div><div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  memcpy(&buffered_values, buffer + byte_offset, bytes_remaining);</div><div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  }</div><div class="line"><a name="l00342"></a><span class="lineno"> 342</span> </div><div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  <span class="keywordflow">for</span> (; i < batch_size; ++i) {</div><div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  detail::GetValue_(num_bits, &v[i], max_bytes, buffer, &bit_offset, &byte_offset,</div><div class="line"><a name="l00345"></a><span clas
s="lineno"> 345</span>  &buffered_values);</div><div class="line"><a name="l00346"></a><span class="lineno"> 346</span>  }</div><div class="line"><a name="l00347"></a><span class="lineno"> 347</span> </div><div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  bit_offset_ = bit_offset;</div><div class="line"><a name="l00349"></a><span class="lineno"> 349</span>  byte_offset_ = byte_offset;</div><div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  buffered_values_ = buffered_values;</div><div class="line"><a name="l00351"></a><span class="lineno"> 351</span> </div><div class="line"><a name="l00352"></a><span class="lineno"> 352</span>  <span class="keywordflow">return</span> batch_size;</div><div class="line"><a name="l00353"></a><span class="lineno"> 353</span> }</div><div class="line"><a name="l00354"></a><span class="lineno"> 354</span> </div><div class="
line"><a name="l00355"></a><span class="lineno"> 355</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T></div><div class="line"><a name="l00356"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_reader.html#ae209b69dc854275c1425d4d11abf36bd"> 356</a></span> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="classarrow_1_1_bit_reader.html#ae209b69dc854275c1425d4d11abf36bd">BitReader::GetAligned</a>(<span class="keywordtype">int</span> num_bytes, T* v) {</div><div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  <a class="code" href="logging_8h.html#a4395e95bab44e222cb2e77251017a0e2">DCHECK_LE</a>(num_bytes, static_cast<int>(<span class="keyword">sizeof</span>(T)));</div><div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  <span class="keywordtype">int</span> bytes_read = <span class="keyword">static_cast<</span
><span class="keywordtype">int</span><span class="keyword">></span>(BitUtil::Ceil(bit_offset_, 8));</div><div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  <span class="keywordflow">if</span> (<a class="code" href="macros_8h.html#a6f2ee7ad52872edb915cf48e163ac99c">ARROW_PREDICT_FALSE</a>(byte_offset_ + bytes_read + num_bytes > max_bytes_))</div><div class="line"><a name="l00360"></a><span class="lineno"> 360</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00361"></a><span class="lineno"> 361</span> </div><div class="line"><a name="l00362"></a><span class="lineno"> 362</span>  <span class="comment">// Advance byte_offset to next unread byte and read num_bytes</span></div><div class="line"><a name="l00363"></a><span class="lineno"> 363</span>  byte_offset_ += bytes_read;</div><div class="line"><a name="l00364"></a><span class="lineno"> 364</span> 
memcpy(v, buffer_ + byte_offset_, num_bytes);</div><div class="line"><a name="l00365"></a><span class="lineno"> 365</span>  byte_offset_ += num_bytes;</div><div class="line"><a name="l00366"></a><span class="lineno"> 366</span> </div><div class="line"><a name="l00367"></a><span class="lineno"> 367</span>  <span class="comment">// Reset buffered_values_</span></div><div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  bit_offset_ = 0;</div><div class="line"><a name="l00369"></a><span class="lineno"> 369</span>  <span class="keywordtype">int</span> bytes_remaining = max_bytes_ - byte_offset_;</div><div class="line"><a name="l00370"></a><span class="lineno"> 370</span>  <span class="keywordflow">if</span> (<a class="code" href="macros_8h.html#a1f418a9edc46d53e62732e7ccd06f329">ARROW_PREDICT_TRUE</a>(bytes_remaining >= 8)) {</div><div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  memcpy(&b
uffered_values_, buffer_ + byte_offset_, 8);</div><div class="line"><a name="l00372"></a><span class="lineno"> 372</span>  } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00373"></a><span class="lineno"> 373</span>  memcpy(&buffered_values_, buffer_ + byte_offset_, bytes_remaining);</div><div class="line"><a name="l00374"></a><span class="lineno"> 374</span>  }</div><div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00376"></a><span class="lineno"> 376</span> }</div><div class="line"><a name="l00377"></a><span class="lineno"> 377</span> </div><div class="line"><a name="l00378"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_reader.html#a93bcd15198d511bf77a3980e4a9d343d"> 378</a></span> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <
a class="code" href="classarrow_1_1_bit_reader.html#a93bcd15198d511bf77a3980e4a9d343d">BitReader::GetVlqInt</a>(int32_t* v) {</div><div class="line"><a name="l00379"></a><span class="lineno"> 379</span>  *v = 0;</div><div class="line"><a name="l00380"></a><span class="lineno"> 380</span>  <span class="keywordtype">int</span> shift = 0;</div><div class="line"><a name="l00381"></a><span class="lineno"> 381</span>  <span class="keywordtype">int</span> num_bytes = 0;</div><div class="line"><a name="l00382"></a><span class="lineno"> 382</span>  uint8_t byte = 0;</div><div class="line"><a name="l00383"></a><span class="lineno"> 383</span>  <span class="keywordflow">do</span> {</div><div class="line"><a name="l00384"></a><span class="lineno"> 384</span>  <span class="keywordflow">if</span> (!GetAligned<uint8_t>(1, &byte)) <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00385">
</a><span class="lineno"> 385</span>  *v |= (byte & 0x7F) << shift;</div><div class="line"><a name="l00386"></a><span class="lineno"> 386</span>  shift += 7;</div><div class="line"><a name="l00387"></a><span class="lineno"> 387</span>  <a class="code" href="logging_8h.html#a4395e95bab44e222cb2e77251017a0e2">DCHECK_LE</a>(++num_bytes, MAX_VLQ_BYTE_LEN);</div><div class="line"><a name="l00388"></a><span class="lineno"> 388</span>  } <span class="keywordflow">while</span> ((byte & 0x80) != 0);</div><div class="line"><a name="l00389"></a><span class="lineno"> 389</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00390"></a><span class="lineno"> 390</span> }</div><div class="line"><a name="l00391"></a><span class="lineno"> 391</span> </div><div class="line"><a name="l00392"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_writer.html#a2e764
de1162c33a6aa41caad00322156"> 392</a></span> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="classarrow_1_1_bit_writer.html#a2e764de1162c33a6aa41caad00322156">BitWriter::PutZigZagVlqInt</a>(int32_t v) {</div><div class="line"><a name="l00393"></a><span class="lineno"> 393</span>  uint32_t u = (v << 1) ^ (v >> 31);</div><div class="line"><a name="l00394"></a><span class="lineno"> 394</span>  <span class="keywordflow">return</span> <a class="code" href="classarrow_1_1_bit_writer.html#a028f9d7d77697df651ef82d2df52f53d">PutVlqInt</a>(u);</div><div class="line"><a name="l00395"></a><span class="lineno"> 395</span> }</div><div class="line"><a name="l00396"></a><span class="lineno"> 396</span> </div><div class="line"><a name="l00397"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_reader.html#ac6f91e5030fb8cc87d27baa58dce66d3"> 397</a></span> <span class="keyword">inline</spa
n> <span class="keywordtype">bool</span> <a class="code" href="classarrow_1_1_bit_reader.html#ac6f91e5030fb8cc87d27baa58dce66d3">BitReader::GetZigZagVlqInt</a>(int32_t* v) {</div><div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  int32_t u_signed;</div><div class="line"><a name="l00399"></a><span class="lineno"> 399</span>  <span class="keywordflow">if</span> (!GetVlqInt(&u_signed)) <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  uint32_t u = <span class="keyword">static_cast<</span>uint32_t<span class="keyword">></span>(u_signed);</div><div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  *<span class="keyword">reinterpret_cast<</span>uint32_t*<span class="keyword">></span>(v) = (u >> 1) ^ -(<span class="keyword">static_cast<</span>int32_t<span class="keyword">></span>(u & 1));<
/div><div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00403"></a><span class="lineno"> 403</span> }</div><div class="line"><a name="l00404"></a><span class="lineno"> 404</span> </div><div class="line"><a name="l00405"></a><span class="lineno"> 405</span> } <span class="comment">// namespace arrow</span></div><div class="line"><a name="l00406"></a><span class="lineno"> 406</span> </div><div class="line"><a name="l00407"></a><span class="lineno"> 407</span> <span class="preprocessor">#endif // ARROW_UTIL_BIT_STREAM_UTILS_H</span></div><div class="ttc" id="classarrow_1_1_bit_writer_html_a407df208444d95e50d5ec6c608104cda"><div class="ttname"><a href="classarrow_1_1_bit_writer.html#a407df208444d95e50d5ec6c608104cda">arrow::BitWriter::PutValue</a></div><div class="ttdeci">bool PutValue(uint64_t v, int num_bits)</div><div
class="ttdoc">Writes a value to buffered_values_, flushing to buffer_ if necessary. </div><div class="ttdef"><b>Definition:</b> bit-stream-utils.h:169</div></div>
+<a href="bit-stream-utils_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">// Licensed to the Apache Software Foundation (ASF) under one</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// or more contributor license agreements. See the NOTICE file</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// distributed with this work for additional information</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// regarding copyright ownership. The ASF licenses this file</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// to you under the Apache License, Version 2.0 (the</span></div><div class="line"><a name="l00006"></a><s
pan class="lineno"> 6</span> <span class="comment">// "License"); you may not use this file except in compliance</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// with the License. You may obtain a copy of the License at</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">//</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</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">// Unless required by applicable law or agreed to in writing,</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// software dist
ributed under the License is distributed on an</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">// KIND, either express or implied. See the License for the</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment">// specific language governing permissions and limitations</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">// under the License.</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> </div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">// From Apache Impala (incubating) as of 2016-01-29</span></div><div class="line"><a name="l0001
9"></a><span class="lineno"> 19</span> </div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#ifndef ARROW_UTIL_BIT_STREAM_UTILS_H</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#define ARROW_UTIL_BIT_STREAM_UTILS_H</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> <span class="preprocessor">#include <<a class="code" href="string_8h.html">string.h</a>></span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include <algorithm></span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include <cstdint></span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> </
div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#include "<a class="code" href="bit-util_8h.html">arrow/util/bit-util.h</a>"</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#include "<a class="code" href="bpacking_8h.html">arrow/util/bpacking.h</a>"</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#include "<a class="code" href="logging_8h.html">arrow/util/logging.h</a>"</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#include "<a class="code" href="macros_8h.html">arrow/util/macros.h</a>"</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> <span class="keyword"
>namespace </span><a class="code" href="namespacearrow.html">arrow</a> {</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div><div class="line"><a name="l00037"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_writer.html"> 37</a></span> <span class="keyword">class </span><a class="code" href="classarrow_1_1_bit_writer.html">BitWriter</a> {</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00041"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_writer.html#a0462b6eb15d93162ee7d2c828309d612"> 41</a></span>  <a class="code" href="classarrow_1_1_bit_writer.html#a0462b6eb15d93162ee7d2c828309d612">BitWriter</a>(uint8_t* <a class="code" href="classarrow_1_1_bit_writer.html#a9d33b2acbd9fca179863fcde288a079d">buffer</a>, <span class="keywordtype">int</span> <a class="code" href="classarrow_1_1_bit_writer.
html#a5592cdd1db11520ea5ae0be95fb4732a">buffer_len</a>) : buffer_(<a class="code" href="classarrow_1_1_bit_writer.html#a9d33b2acbd9fca179863fcde288a079d">buffer</a>), max_bytes_(<a class="code" href="classarrow_1_1_bit_writer.html#a5592cdd1db11520ea5ae0be95fb4732a">buffer_len</a>) {</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <a class="code" href="classarrow_1_1_bit_writer.html#a324ef275bfbcb49d823aa4fbced24446">Clear</a>();</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  }</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> </div><div class="line"><a name="l00045"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_writer.html#a324ef275bfbcb49d823aa4fbced24446"> 45</a></span>  <span class="keywordtype">void</span> <a class="code" href="classarrow_1_1_bit_writer.html#a324ef275bfbcb49d823aa4fbced24446">Clear</a>() {</div><div class="line"><a name="l0004
6"></a><span class="lineno"> 46</span>  buffered_values_ = 0;</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  byte_offset_ = 0;</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  bit_offset_ = 0;</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="l00053"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_writer.html#a73de4690985f7274c69b6dba99922743"> 53</a></span>  <span class="keywordtype">int</span> <a class="code" href="classarrow_1_1_bit_writer.html#a73de4690985f7274c69b6dba99922743">bytes_written</a>()<span class="keyword"> const </span>{</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordflow">return</span> byte_offset_ + <span class="keyword">static_cast<</span>
<span class="keywordtype">int</span><span class="keyword">></span>(BitUtil::Ceil(bit_offset_, 8));</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  }</div><div class="line"><a name="l00056"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_writer.html#a9d33b2acbd9fca179863fcde288a079d"> 56</a></span>  uint8_t* <a class="code" href="classarrow_1_1_bit_writer.html#a9d33b2acbd9fca179863fcde288a079d">buffer</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> buffer_; }</div><div class="line"><a name="l00057"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_writer.html#a5592cdd1db11520ea5ae0be95fb4732a"> 57</a></span>  <span class="keywordtype">int</span> <a class="code" href="classarrow_1_1_bit_writer.html#a5592cdd1db11520ea5ae0be95fb4732a">buffer_len</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> max_bytes_; }</div><div class="line">
<a name="l00058"></a><span class="lineno"> 58</span> </div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordtype">bool</span> <a class="code" href="classarrow_1_1_bit_writer.html#a407df208444d95e50d5ec6c608104cda">PutValue</a>(uint64_t v, <span class="keywordtype">int</span> num_bits);</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> T></div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordtype">bool</span> <a class="code" href="classarrow_1_1_bit_writer.html#aa76314faef71d7ad351dbd3f16c84fc0">PutAligned</a>(T v, <span class="keywordtype">int</span> num_bytes);</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> </div><div class="line"><a name="l
00073"></a><span class="lineno"> 73</span>  <span class="keywordtype">bool</span> <a class="code" href="classarrow_1_1_bit_writer.html#a028f9d7d77697df651ef82d2df52f53d">PutVlqInt</a>(uint32_t v);</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="comment">// Writes an int zigzag encoded.</span></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keywordtype">bool</span> <a class="code" href="classarrow_1_1_bit_writer.html#a2e764de1162c33a6aa41caad00322156">PutZigZagVlqInt</a>(int32_t v);</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  uint8_t* <a class="code" href="classarrow_1_1_bit_writer.html#a2d5943b81c4340b54bfd019955a7d959">GetNextBytePtr</a>(<span class="keywordtype">int</sp
an> num_bytes = 1);</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> </div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordtype">void</span> <a class="code" href="classarrow_1_1_bit_writer.html#a869a43c7c8006e1658fd4ae44a92e347">Flush</a>(<span class="keywordtype">bool</span> align = <span class="keyword">false</span>);</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="keyword">private</span>:</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  uint8_t* buffer_;</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordtype">int</span> max_bytes_;</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> </div><div class="line"><a name="l00094"></a><span class="linen
o"> 94</span>  uint64_t buffered_values_;</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="keywordtype">int</span> byte_offset_; <span class="comment">// Offset in buffer_</span></div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keywordtype">int</span> bit_offset_; <span class="comment">// Offset in buffered_values_</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"> 99</span> </div><div class="line"><a name="l00103"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_reader.html"> 103</a></span> <span class="keyword">class </span><a class="code" href="classarrow_1_1_bit_reader.html">BitReader</a> {</div><div class="line"><a name="l00104"></a><span class="lineno"
> 104</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00106"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_reader.html#a714971e13b725100437484becf9b8ae4"> 106</a></span>  <a class="code" href="classarrow_1_1_bit_reader.html#a714971e13b725100437484becf9b8ae4">BitReader</a>(<span class="keyword">const</span> uint8_t* buffer, <span class="keywordtype">int</span> buffer_len)</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  : buffer_(buffer), max_bytes_(buffer_len), byte_offset_(0), bit_offset_(0) {</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordtype">int</span> num_bytes = std::min(8, max_bytes_ - byte_offset_);</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  memcpy(&buffered_values_, buffer_ + byte_offset_, num_bytes);</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> </div><div class="line"><a name="l00112"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_reader.html#a59f592e16907128787dfaa8c7cfa839e"> 112</a></span>  <a class="code" href="classarrow_1_1_bit_reader.html#a59f592e16907128787dfaa8c7cfa839e">BitReader</a>() : buffer_(NULL), max_bytes_(0) {}</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span> </div><div class="line"><a name="l00114"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_reader.html#aaaefbf3fa141ce764cda52c0e1e55103"> 114</a></span>  <span class="keywordtype">void</span> <a class="code" href="classarrow_1_1_bit_reader.html#aaaefbf3fa141ce764cda52c0e1e55103">Reset</a>(<span class="keyword">const</span> uint8_t* buffer, <span class="keywordtype">int</span> buffer_len) {</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span
>  buffer_ = buffer;</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  max_bytes_ = buffer_len;</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  byte_offset_ = 0;</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  bit_offset_ = 0;</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keywordtype">int</span> num_bytes = std::min(8, max_bytes_ - byte_offset_);</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  memcpy(&buffered_values_, buffer_ + byte_offset_, num_bytes);</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  }</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span> </div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keyword">template</span> <<span class="keyword
">typename</span> T></div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordtype">bool</span> <a class="code" href="classarrow_1_1_bit_reader.html#a20420d2374d3eb9177c5c3a0f5493cd1">GetValue</a>(<span class="keywordtype">int</span> num_bits, T* v);</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span> </div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> T></div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordtype">int</span> <a class="code" href="classarrow_1_1_bit_reader.html#a6f023d4ce78bd6a9cbc2f372f441d964">GetBatch</a>(<span class="keywordtype">int</span> num_bits, T* v, <span class="keywordtype">int</span> batch_size);</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span> </div><div class="line"><a name
="l00137"></a><span class="lineno"> 137</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> T></div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keywordtype">bool</span> <a class="code" href="classarrow_1_1_bit_reader.html#ae209b69dc854275c1425d4d11abf36bd">GetAligned</a>(<span class="keywordtype">int</span> num_bytes, T* v);</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span> </div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="keywordtype">bool</span> <a class="code" href="classarrow_1_1_bit_reader.html#a93bcd15198d511bf77a3980e4a9d343d">GetVlqInt</a>(int32_t* v);</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="comment">// Reads a zigzag encoded int `into` v.</span></div><div class
="line"><a name="l00146"></a><span class="lineno"> 146</span>  <span class="keywordtype">bool</span> <a class="code" href="classarrow_1_1_bit_reader.html#ac6f91e5030fb8cc87d27baa58dce66d3">GetZigZagVlqInt</a>(int32_t* v);</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span> </div><div class="line"><a name="l00150"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_reader.html#a943f521c4855e418bc106e55fd2de8d3"> 150</a></span>  <span class="keywordtype">int</span> <a class="code" href="classarrow_1_1_bit_reader.html#a943f521c4855e418bc106e55fd2de8d3">bytes_left</a>() {</div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="keywordflow">return</span> max_bytes_ - (byte_offset_ + <span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(BitUtil::Ceil(bit_offset_, 8)));</div><div class="line"><a name="l00152"></a><span class="lin
eno"> 152</span>  }</div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span> </div><div class="line"><a name="l00155"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_reader.html#aa5953074578c6d5e068574ab4ccb3e35"> 155</a></span>  <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> <a class="code" href="classarrow_1_1_bit_reader.html#aa5953074578c6d5e068574ab4ccb3e35">MAX_VLQ_BYTE_LEN</a> = 5;</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>  <span class="keyword">private</span>:</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <span class="keyword">const</span> uint8_t* buffer_;</div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="keywordtype">int</span> max_bytes_;</div><div
class="line"><a name="l00160"></a><span class="lineno"> 160</span> </div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  uint64_t buffered_values_;</div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span> </div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="keywordtype">int</span> byte_offset_; <span class="comment">// Offset in buffer_</span></div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="keywordtype">int</span> bit_offset_; <span class="comment">// Offset in buffered_values_</span></div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span> };</div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span> </div><div class="line"><a name="l00169"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_writer.html#a407df208444d95e50d5ec6c608104cda"> 169</a></span>
0;<span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="classarrow_1_1_bit_writer.html#a407df208444d95e50d5ec6c608104cda">BitWriter::PutValue</a>(uint64_t v, <span class="keywordtype">int</span> num_bits) {</div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="comment">// TODO: revisit this limit if necessary (can be raised to 64 by fixing some edge cases)</span></div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <a class="code" href="logging_8h.html#a4395e95bab44e222cb2e77251017a0e2">DCHECK_LE</a>(num_bits, 32);</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <a class="code" href="logging_8h.html#ae89df3243bbb8341130c7b3f44145ea0">DCHECK_EQ</a>(v >> num_bits, 0) << <span class="stringliteral">"v = "</span> << v << <span class="stringliteral">", num_bits = "</span> << num_bits;</
div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span> </div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="keywordflow">if</span> (<a class="code" href="macros_8h.html#a6f2ee7ad52872edb915cf48e163ac99c">ARROW_PREDICT_FALSE</a>(byte_offset_ * 8 + bit_offset_ + num_bits > max_bytes_ * 8))</div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="keywordflow">return</span> <span class="keyword">false</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>  buffered_values_ |= v << bit_offset_;</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  bit_offset_ += num_bits;</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span> </div><div class="line"><a name="l00180"></a><span class="linen
o"> 180</span>  <span class="keywordflow">if</span> (<a class="code" href="macros_8h.html#a6f2ee7ad52872edb915cf48e163ac99c">ARROW_PREDICT_FALSE</a>(bit_offset_ >= 64)) {</div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="comment">// Flush buffered_values_ and write out bits of v that did not fit</span></div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  memcpy(buffer_ + byte_offset_, &buffered_values_, 8);</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  buffered_values_ = 0;</div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  byte_offset_ += 8;</div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  bit_offset_ -= 64;</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  buffered_values_ = v >> (num_bits - bit_offset_);</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>  <a class="code" href="logging_8h.html#ab62f5ed8f2d48e29802be0cbbcd1359a">DCHECK_LT</a>(bit_offset_, 64);</div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span> }</div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span> </div><div class="line"><a name="l00192"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_writer.html#a869a43c7c8006e1658fd4ae44a92e347"> 192</a></span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classarrow_1_1_bit_writer.html#a869a43c7c8006e1658fd4ae44a92e347">BitWriter::Flush</a>(<span class="keywordtype">bool</span> align) {</div><div
class="line"><a name="l00193"></a><span class="lineno"> 193</span>  <span class="keywordtype">int</span> num_bytes = <span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(BitUtil::Ceil(bit_offset_, 8));</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  <a class="code" href="logging_8h.html#a4395e95bab44e222cb2e77251017a0e2">DCHECK_LE</a>(byte_offset_ + num_bytes, max_bytes_);</div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  memcpy(buffer_ + byte_offset_, &buffered_values_, num_bytes);</div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span> </div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="keywordflow">if</span> (align) {</div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  buffered_values_ = 0;</div><div class="line"><a name="l00199"><
/a><span class="lineno"> 199</span>  byte_offset_ += num_bytes;</div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  bit_offset_ = 0;</div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  }</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"><a class="line" href="classarrow_1_1_bit_writer.html#a2d5943b81c4340b54bfd019955a7d959"> 204</a></span> <span class="keyword">inline</span> uint8_t* <a class="code" href="classarrow_1_1_bit_writer.html#a2d5943b81c4340b54bfd019955a7d959">BitWriter::GetNextBytePtr</a>(<span class="keywordtype">int</span> num_bytes) {</div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  <a class="code" href="classarrow_1_1_bit_writer.html#a869a43c7c8006e1658fd4ae44a92e347">Flu
sh</a>(<span class="comment">/* align */</span> <span class="keyword">true</span>);</div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <a class="code" href="logging_8h.html#a4395e95bab44e222cb2e77251017a0e2">DCHECK_LE</a>(byte_offset_, max_bytes_);</div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <span class="keywordflow">if</span> (byte_offset_ + num_bytes > max_bytes_) <span class="keywordflow">return</span> NULL;</div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  uint8_t* ptr = buffer_ + byte_offset_;</div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  byte_offset_ += num_bytes;</div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="keywordflow">return</span> ptr;</div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span> }</div><div class="line"><a name="l00212"></a><span cla
ss="lineno"> 212</span> </div><div class="line"><a name="l00213"></a><span class="lineno"> 213</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T></div><div class="line"><a name="l00214"></a><span class="lineno"><a class="line" href="classarrow_1_1_bit_writer.html#aa76314faef71d7ad351dbd3f16c84fc0"> 214</a></span> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="classarrow_1_1_bit_writer.html#aa76314faef71d7ad351dbd3f16c84fc0">BitWriter::PutAligned</a>(T val, <span class="keywordtype">int</span> num_bytes) {</div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  uint8_t* ptr = <a class="code" href="classarrow_1_1_bit_writer.html#a2d5943b81c4340b54bfd019955a7d959">GetNextBytePtr</a>(num_bytes);</div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="keywordflow">if</span> (ptr == NULL) <span class="keywordflo
w">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  memcpy(ptr, &val, num_bytes);</div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</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"><a class="line" href="classarrow_1_1_bit_writer.html#a028f9d7d77697df651ef82d2df52f53d"> 221</a></span> 
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