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<a href="#pub-methods">Public Member Functions</a> &#124;
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<div class="title">impala::BitReader_8byte Class Reference</div> </div>
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<p><code>#include &lt;<a class="el" href="bit-stream-utils_88byte_8h_source.html">bit-stream-utils.8byte.h</a>&gt;</code></p>
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Collaboration diagram for impala::BitReader_8byte:</div>
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Public Member Functions</h2></td></tr>
<tr class="memitem:ac5cb0fdeec33d3ae5ddd856f71c0503a"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1BitReader__8byte.html#ac5cb0fdeec33d3ae5ddd856f71c0503a">BitReader_8byte</a> (uint8_t *buffer, int buffer_len)</td></tr>
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<tr class="memitem:a06027c6d6d710473ff9b14a968a2e88f"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1BitReader__8byte.html#a06027c6d6d710473ff9b14a968a2e88f">BitReader_8byte</a> ()</td></tr>
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<tr class="memitem:a744617f92cd6341740019af5f4861f4c"><td class="memTemplParams" colspan="2">template&lt;typename T &gt; </td></tr>
<tr class="memitem:a744617f92cd6341740019af5f4861f4c"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="classbool.html">bool</a>&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classimpala_1_1BitReader__8byte.html#a744617f92cd6341740019af5f4861f4c">GetValue</a> (int num_bits, T *v)</td></tr>
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<tr class="memitem:aa3f8a1cf81ec0e6b4324c4ecae6589a9"><td class="memTemplParams" colspan="2">template&lt;typename T &gt; </td></tr>
<tr class="memitem:aa3f8a1cf81ec0e6b4324c4ecae6589a9"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="classbool.html">bool</a>&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classimpala_1_1BitReader__8byte.html#aa3f8a1cf81ec0e6b4324c4ecae6589a9">GetAligned</a> (int num_bits, T *v)</td></tr>
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<tr class="memitem:a6eafe69d17a7073df9df0296870e522f"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1BitReader__8byte.html#a6eafe69d17a7073df9df0296870e522f">bytes_left</a> ()</td></tr>
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Static Public Attributes</h2></td></tr>
<tr class="memitem:ad3b3ccf8b223d4c99cf65acf64ce517d"><td class="memItemLeft" align="right" valign="top">static const int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1BitReader__8byte.html#ad3b3ccf8b223d4c99cf65acf64ce517d">MAX_VLQ_BYTE_LEN</a> = 5</td></tr>
<tr class="memdesc:ad3b3ccf8b223d4c99cf65acf64ce517d"><td class="mdescLeft">&#160;</td><td class="mdescRight">Maximum byte length of a vlq encoded int. <a href="#ad3b3ccf8b223d4c99cf65acf64ce517d">More...</a><br/></td></tr>
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Private Member Functions</h2></td></tr>
<tr class="memitem:ab9b53c8dfd892247bf59d34f19f10abb"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1BitReader__8byte.html#ab9b53c8dfd892247bf59d34f19f10abb">Align</a> ()</td></tr>
<tr class="memdesc:ab9b53c8dfd892247bf59d34f19f10abb"><td class="mdescLeft">&#160;</td><td class="mdescRight">Advances offset_ and/or bit_offset_ to next byte boundary in buffer_. <a href="#ab9b53c8dfd892247bf59d34f19f10abb">More...</a><br/></td></tr>
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Private Attributes</h2></td></tr>
<tr class="memitem:a046c83097fd728a8e4c1afbb3866e0a3"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classuint64__t.html">uint64_t</a> *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1BitReader__8byte.html#a046c83097fd728a8e4c1afbb3866e0a3">buffer_</a></td></tr>
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<tr class="memitem:a06826bb7a759b8ccb7d71759c10d7e91"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1BitReader__8byte.html#a06826bb7a759b8ccb7d71759c10d7e91">max_bytes_</a></td></tr>
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<tr class="memitem:a1ac918fde6353ee958189d6c7538f358"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1BitReader__8byte.html#a1ac918fde6353ee958189d6c7538f358">offset_</a></td></tr>
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<tr class="memitem:a5b48a90406a579ef4d1a4ba1493cffa6"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1BitReader__8byte.html#a5b48a90406a579ef4d1a4ba1493cffa6">bit_offset_</a></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Utility class to read bit/byte stream. This class can read bits or bytes that are either byte aligned or not. It also has utilities to read multiple bytes in one read (e.g. encoded int). </p>
<p>Definition at line <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00084">84</a> of file <a class="el" href="bit-stream-utils_88byte_8h_source.html">bit-stream-utils.8byte.h</a>.</p>
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<p>buffer: buffer to read from. The buffer's length is 'buffer_len' and must be a multiple of 8. </p>
<p>Definition at line <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00088">88</a> of file <a class="el" href="bit-stream-utils_88byte_8h_source.html">bit-stream-utils.8byte.h</a>.</p>
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<p>Definition at line <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00096">96</a> of file <a class="el" href="bit-stream-utils_88byte_8h_source.html">bit-stream-utils.8byte.h</a>.</p>
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<h2 class="groupheader">Member Function Documentation</h2>
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<p>Advances offset_ and/or bit_offset_ to next byte boundary in buffer_. </p>
<p>Definition at line <a class="el" href="bit-stream-utils_88byte_8inline_8h_source.html#l00130">130</a> of file <a class="el" href="bit-stream-utils_88byte_8inline_8h_source.html">bit-stream-utils.8byte.inline.h</a>.</p>
<p>References <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00126">bit_offset_</a>, <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00124">max_bytes_</a>, <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00125">offset_</a>, <a class="el" href="bit-util_8h_source.html#l00077">impala::BitUtil::RoundUpNumBytes()</a>, and <a class="el" href="compiler-util_8h_source.html#l00033">UNLIKELY</a>.</p>
<p>Referenced by <a class="el" href="bit-stream-utils_88byte_8inline_8h_source.html#l00106">GetAligned()</a>.</p>
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<p>Returns the number of bytes left in the stream, not including the current byte (i.e., there may be an additional fraction of a byte). </p>
<p>Definition at line <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00115">115</a> of file <a class="el" href="bit-stream-utils_88byte_8h_source.html">bit-stream-utils.8byte.h</a>.</p>
<p>References <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00126">bit_offset_</a>, <a class="el" href="bit-util_8h_source.html#l00032">impala::BitUtil::Ceil()</a>, <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00124">max_bytes_</a>, and <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00125">offset_</a>.</p>
<p>Referenced by <a class="el" href="bit-stream-utils_88byte_8inline_8h_source.html#l00106">GetAligned()</a>.</p>
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<p>Reads a T sized value from the buffer. T needs to be a native type and little endian. The value is assumed to be byte aligned so the stream will be advance to the start of the next byte before v is read. </p>
<p>Definition at line <a class="el" href="bit-stream-utils_88byte_8inline_8h_source.html#l00106">106</a> of file <a class="el" href="bit-stream-utils_88byte_8inline_8h_source.html">bit-stream-utils.8byte.inline.h</a>.</p>
<p>References <a class="el" href="bit-stream-utils_88byte_8inline_8h_source.html#l00130">Align()</a>, <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00126">bit_offset_</a>, <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00115">bytes_left()</a>, <a class="el" href="bit-util_8h_source.html#l00032">impala::BitUtil::Ceil()</a>, <a class="el" href="bit-stream-utils_88byte_8inline_8h_source.html#l00087">GetValue()</a>, and <a class="el" href="compiler-util_8h_source.html#l00033">UNLIKELY</a>.</p>
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<p>Gets the next value from the buffer. Returns true if 'v' could be read or false if there are not enough bytes left. </p>
<p>Definition at line <a class="el" href="bit-stream-utils_88byte_8inline_8h_source.html#l00087">87</a> of file <a class="el" href="bit-stream-utils_88byte_8inline_8h_source.html">bit-stream-utils.8byte.inline.h</a>.</p>
<p>References <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00126">bit_offset_</a>, <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00123">buffer_</a>, <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00124">max_bytes_</a>, <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00125">offset_</a>, <a class="el" href="bit-util_8h_source.html#l00125">impala::BitUtil::TrailingBits()</a>, and <a class="el" href="compiler-util_8h_source.html#l00033">UNLIKELY</a>.</p>
<p>Referenced by <a class="el" href="bit-stream-utils_88byte_8inline_8h_source.html#l00106">GetAligned()</a>, and <a class="el" href="rle-benchmark_8cc_source.html#l00171">TestBitWriter8ByteDecode()</a>.</p>
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<td class="memname"><a class="el" href="classbool.html">bool</a> impala::BitReader_8byte::GetVlqInt </td>
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<p>Reads a vlq encoded int from the stream. The encoded int must start at the beginning of a byte. Return false if there were not enough bytes in the buffer. </p>
<p>Definition at line <a class="el" href="bit-stream-utils_88byte_8inline_8h_source.html#l00116">116</a> of file <a class="el" href="bit-stream-utils_88byte_8inline_8h_source.html">bit-stream-utils.8byte.inline.h</a>.</p>
<p>References <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00120">MAX_VLQ_BYTE_LEN</a>.</p>
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<h2 class="groupheader">Member Data Documentation</h2>
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<td class="memname">int impala::BitReader_8byte::bit_offset_</td>
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<p>Definition at line <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00126">126</a> of file <a class="el" href="bit-stream-utils_88byte_8h_source.html">bit-stream-utils.8byte.h</a>.</p>
<p>Referenced by <a class="el" href="bit-stream-utils_88byte_8inline_8h_source.html#l00130">Align()</a>, <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00115">bytes_left()</a>, <a class="el" href="bit-stream-utils_88byte_8inline_8h_source.html#l00106">GetAligned()</a>, and <a class="el" href="bit-stream-utils_88byte_8inline_8h_source.html#l00087">GetValue()</a>.</p>
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<td class="memname"><a class="el" href="classuint64__t.html">uint64_t</a>* impala::BitReader_8byte::buffer_</td>
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<p>Definition at line <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00123">123</a> of file <a class="el" href="bit-stream-utils_88byte_8h_source.html">bit-stream-utils.8byte.h</a>.</p>
<p>Referenced by <a class="el" href="bit-stream-utils_88byte_8inline_8h_source.html#l00087">GetValue()</a>.</p>
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<td class="memname">int impala::BitReader_8byte::max_bytes_</td>
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<p>Definition at line <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00124">124</a> of file <a class="el" href="bit-stream-utils_88byte_8h_source.html">bit-stream-utils.8byte.h</a>.</p>
<p>Referenced by <a class="el" href="bit-stream-utils_88byte_8inline_8h_source.html#l00130">Align()</a>, <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00115">bytes_left()</a>, and <a class="el" href="bit-stream-utils_88byte_8inline_8h_source.html#l00087">GetValue()</a>.</p>
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<td class="memname">const int impala::BitReader_8byte::MAX_VLQ_BYTE_LEN = 5</td>
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<p>Maximum byte length of a vlq encoded int. </p>
<p>Definition at line <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00120">120</a> of file <a class="el" href="bit-stream-utils_88byte_8h_source.html">bit-stream-utils.8byte.h</a>.</p>
<p>Referenced by <a class="el" href="bit-stream-utils_88byte_8inline_8h_source.html#l00116">GetVlqInt()</a>.</p>
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<td class="memname">int impala::BitReader_8byte::offset_</td>
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<p>Definition at line <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00125">125</a> of file <a class="el" href="bit-stream-utils_88byte_8h_source.html">bit-stream-utils.8byte.h</a>.</p>
<p>Referenced by <a class="el" href="bit-stream-utils_88byte_8inline_8h_source.html#l00130">Align()</a>, <a class="el" href="bit-stream-utils_88byte_8h_source.html#l00115">bytes_left()</a>, and <a class="el" href="bit-stream-utils_88byte_8inline_8h_source.html#l00087">GetValue()</a>.</p>
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<hr/>The documentation for this class was generated from the following files:<ul>
<li>be/src/experiments/<a class="el" href="bit-stream-utils_88byte_8h_source.html">bit-stream-utils.8byte.h</a></li>
<li>be/src/experiments/<a class="el" href="bit-stream-utils_88byte_8inline_8h_source.html">bit-stream-utils.8byte.inline.h</a></li>
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