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<p><code>#include &lt;<a class="el" href="bit-stream-utils_8h_source.html">bit-stream-utils.h</a>&gt;</code></p>
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Collaboration diagram for impala::BitReader:</div>
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Public Member Functions</h2></td></tr>
<tr class="memitem:a016112347761511943c948fe497b43a0"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1BitReader.html#a016112347761511943c948fe497b43a0">BitReader</a> (uint8_t *buffer, int buffer_len)</td></tr>
<tr class="memdesc:a016112347761511943c948fe497b43a0"><td class="mdescLeft">&#160;</td><td class="mdescRight">'buffer' is the buffer to read from. The buffer's length is 'buffer_len'. <a href="#a016112347761511943c948fe497b43a0">More...</a><br/></td></tr>
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<tr class="memitem:a7ca349d77fe748a1e53371f1e2ab50cb"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1BitReader.html#a7ca349d77fe748a1e53371f1e2ab50cb">BitReader</a> ()</td></tr>
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<tr class="memitem:a6fb11125149229ec58ec2340d7d457c8"><td class="memTemplParams" colspan="2">template&lt;typename T &gt; </td></tr>
<tr class="memitem:a6fb11125149229ec58ec2340d7d457c8"><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.html#a6fb11125149229ec58ec2340d7d457c8">GetValue</a> (int num_bits, T *v)</td></tr>
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<tr class="memitem:a868c7d0fb2b466b6bc6ed357e4137635"><td class="memTemplParams" colspan="2">template&lt;typename T &gt; </td></tr>
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<tr class="memitem:a9b43f9b49478ce5b78adea9e651ba170"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classbool.html">bool</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1BitReader.html#a9b43f9b49478ce5b78adea9e651ba170">GetVlqInt</a> (int32_t *v)</td></tr>
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<tr class="memitem:a7e1f5e42d0e4ceed3241f996fcd5004d"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1BitReader.html#a7e1f5e42d0e4ceed3241f996fcd5004d">bytes_left</a> ()</td></tr>
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Static Public Attributes</h2></td></tr>
<tr class="memitem:a82d53654593c787d056b6186f50a941b"><td class="memItemLeft" align="right" valign="top">static const int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1BitReader.html#a82d53654593c787d056b6186f50a941b">MAX_VLQ_BYTE_LEN</a> = 5</td></tr>
<tr class="memdesc:a82d53654593c787d056b6186f50a941b"><td class="mdescLeft">&#160;</td><td class="mdescRight">Maximum byte length of a vlq encoded int. <a href="#a82d53654593c787d056b6186f50a941b">More...</a><br/></td></tr>
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Private Attributes</h2></td></tr>
<tr class="memitem:a5b5e257e5ed6b3ae6164bcf7414f1793"><td class="memItemLeft" align="right" valign="top">uint8_t *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1BitReader.html#a5b5e257e5ed6b3ae6164bcf7414f1793">buffer_</a></td></tr>
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<tr class="memitem:a965f5d9efef99161a8e469181df08d94"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1BitReader.html#a965f5d9efef99161a8e469181df08d94">max_bytes_</a></td></tr>
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<tr class="memitem:a40fea8e87a810983ada5a96a17bf8565"><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.html#a40fea8e87a810983ada5a96a17bf8565">buffered_values_</a></td></tr>
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<tr class="memitem:adbbdde5af8a3b7cfcf5a2702a76991fb"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1BitReader.html#adbbdde5af8a3b7cfcf5a2702a76991fb">byte_offset_</a></td></tr>
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<tr class="memitem:a05d2b0ee77ea6c0392c76eb8ae123675"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1BitReader.html#a05d2b0ee77ea6c0392c76eb8ae123675">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_8h_source.html#l00092">92</a> of file <a class="el" href="bit-stream-utils_8h_source.html">bit-stream-utils.h</a>.</p>
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<p>'buffer' is the buffer to read from. The buffer's length is 'buffer_len'. </p>
<p>Definition at line <a class="el" href="bit-stream-utils_8h_source.html#l00095">95</a> of file <a class="el" href="bit-stream-utils_8h_source.html">bit-stream-utils.h</a>.</p>
<p>References <a class="el" href="bit-stream-utils_8h_source.html#l00130">buffer_</a>, <a class="el" href="bit-stream-utils_8h_source.html#l00135">buffered_values_</a>, <a class="el" href="bit-stream-utils_8h_source.html#l00137">byte_offset_</a>, and <a class="el" href="bit-stream-utils_8h_source.html#l00131">max_bytes_</a>.</p>
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<p>Definition at line <a class="el" href="bit-stream-utils_8h_source.html#l00104">104</a> of file <a class="el" href="bit-stream-utils_8h_source.html">bit-stream-utils.h</a>.</p>
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<h2 class="groupheader">Member Function Documentation</h2>
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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_8h_source.html#l00124">124</a> of file <a class="el" href="bit-stream-utils_8h_source.html">bit-stream-utils.h</a>.</p>
<p>References <a class="el" href="bit-stream-utils_8h_source.html#l00138">bit_offset_</a>, <a class="el" href="bit-stream-utils_8h_source.html#l00137">byte_offset_</a>, <a class="el" href="bit-util_8h_source.html#l00032">impala::BitUtil::Ceil()</a>, and <a class="el" href="bit-stream-utils_8h_source.html#l00131">max_bytes_</a>.</p>
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<p>Reads a 'num_bytes'-sized value from the buffer and stores it in 'v'. T needs to be a little-endian native type and big enough to store 'num_bytes'. The value is assumed to be byte-aligned so the stream will be advanced to the start of the next byte before 'v' is read. Returns false if there are not enough bytes left. </p>
<p>Definition at line <a class="el" href="bit-stream-utils_8inline_8h_source.html#l00115">115</a> of file <a class="el" href="bit-stream-utils_8inline_8h_source.html">bit-stream-utils.inline.h</a>.</p>
<p>References <a class="el" href="bit-stream-utils_8h_source.html#l00138">bit_offset_</a>, <a class="el" href="bit-stream-utils_8h_source.html#l00130">buffer_</a>, <a class="el" href="bit-stream-utils_8h_source.html#l00135">buffered_values_</a>, <a class="el" href="bit-stream-utils_8h_source.html#l00137">byte_offset_</a>, <a class="el" href="bit-util_8h_source.html#l00032">impala::BitUtil::Ceil()</a>, <a class="el" href="compiler-util_8h_source.html#l00032">LIKELY</a>, <a class="el" href="bit-stream-utils_8h_source.html#l00131">max_bytes_</a>, and <a class="el" href="compiler-util_8h_source.html#l00033">UNLIKELY</a>.</p>
<p>Referenced by <a class="el" href="rle-encoding_8h_source.html#l00229">impala::RleDecoder::Get()</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. num_bits must be &lt;= 32. </p>
<p>Definition at line <a class="el" href="bit-stream-utils_8inline_8h_source.html#l00085">85</a> of file <a class="el" href="bit-stream-utils_8inline_8h_source.html">bit-stream-utils.inline.h</a>.</p>
<p>References <a class="el" href="bit-stream-utils_8h_source.html#l00138">bit_offset_</a>, <a class="el" href="bit-stream-utils_8h_source.html#l00130">buffer_</a>, <a class="el" href="bit-stream-utils_8h_source.html#l00135">buffered_values_</a>, <a class="el" href="bit-stream-utils_8h_source.html#l00137">byte_offset_</a>, <a class="el" href="compiler-util_8h_source.html#l00032">LIKELY</a>, <a class="el" href="bit-stream-utils_8h_source.html#l00131">max_bytes_</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="rle-encoding_8h_source.html#l00229">impala::RleDecoder::Get()</a>, <a class="el" href="hdfs-parquet-scanner_8cc_source.html#l00428">impala::HdfsParquetScanner::BoolColumnReader::ReadSlot()</a>, <a class="el" href="rle-test_8cc_source.html#l00033">impala::TEST()</a>, and <a class="el" href="rle-benchmark_8cc_source.html#l00152">TestBitWriterDecode()</a>.</p>
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<td class="memname"><a class="el" href="classbool.html">bool</a> impala::BitReader::GetVlqInt </td>
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<td class="paramtype">int32_t *&#160;</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_8inline_8h_source.html#l00136">136</a> of file <a class="el" href="bit-stream-utils_8inline_8h_source.html">bit-stream-utils.inline.h</a>.</p>
<p>References <a class="el" href="bit-stream-utils_8h_source.html#l00127">MAX_VLQ_BYTE_LEN</a>.</p>
<p>Referenced by <a class="el" href="rle-encoding_8h_source.html#l00229">impala::RleDecoder::Get()</a>.</p>
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<h2 class="groupheader">Member Data Documentation</h2>
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<td class="memname">int impala::BitReader::bit_offset_</td>
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<p>Definition at line <a class="el" href="bit-stream-utils_8h_source.html#l00138">138</a> of file <a class="el" href="bit-stream-utils_8h_source.html">bit-stream-utils.h</a>.</p>
<p>Referenced by <a class="el" href="bit-stream-utils_8h_source.html#l00124">bytes_left()</a>, <a class="el" href="bit-stream-utils_8inline_8h_source.html#l00115">GetAligned()</a>, and <a class="el" href="bit-stream-utils_8inline_8h_source.html#l00085">GetValue()</a>.</p>
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<td class="memname">uint8_t* impala::BitReader::buffer_</td>
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<p>Definition at line <a class="el" href="bit-stream-utils_8h_source.html#l00130">130</a> of file <a class="el" href="bit-stream-utils_8h_source.html">bit-stream-utils.h</a>.</p>
<p>Referenced by <a class="el" href="bit-stream-utils_8h_source.html#l00095">BitReader()</a>, <a class="el" href="bit-stream-utils_8inline_8h_source.html#l00115">GetAligned()</a>, and <a class="el" href="bit-stream-utils_8inline_8h_source.html#l00085">GetValue()</a>.</p>
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<td class="memname"><a class="el" href="classuint64__t.html">uint64_t</a> impala::BitReader::buffered_values_</td>
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<p>Bytes are memcpy'd from buffer_ and values are read from this variable. This is faster than reading values byte by byte directly from buffer_. </p>
<p>Definition at line <a class="el" href="bit-stream-utils_8h_source.html#l00135">135</a> of file <a class="el" href="bit-stream-utils_8h_source.html">bit-stream-utils.h</a>.</p>
<p>Referenced by <a class="el" href="bit-stream-utils_8h_source.html#l00095">BitReader()</a>, <a class="el" href="bit-stream-utils_8inline_8h_source.html#l00115">GetAligned()</a>, and <a class="el" href="bit-stream-utils_8inline_8h_source.html#l00085">GetValue()</a>.</p>
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<td class="memname">int impala::BitReader::byte_offset_</td>
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<p>Definition at line <a class="el" href="bit-stream-utils_8h_source.html#l00137">137</a> of file <a class="el" href="bit-stream-utils_8h_source.html">bit-stream-utils.h</a>.</p>
<p>Referenced by <a class="el" href="bit-stream-utils_8h_source.html#l00095">BitReader()</a>, <a class="el" href="bit-stream-utils_8h_source.html#l00124">bytes_left()</a>, <a class="el" href="bit-stream-utils_8inline_8h_source.html#l00115">GetAligned()</a>, and <a class="el" href="bit-stream-utils_8inline_8h_source.html#l00085">GetValue()</a>.</p>
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<td class="memname">int impala::BitReader::max_bytes_</td>
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<p>Definition at line <a class="el" href="bit-stream-utils_8h_source.html#l00131">131</a> of file <a class="el" href="bit-stream-utils_8h_source.html">bit-stream-utils.h</a>.</p>
<p>Referenced by <a class="el" href="bit-stream-utils_8h_source.html#l00095">BitReader()</a>, <a class="el" href="bit-stream-utils_8h_source.html#l00124">bytes_left()</a>, <a class="el" href="bit-stream-utils_8inline_8h_source.html#l00115">GetAligned()</a>, and <a class="el" href="bit-stream-utils_8inline_8h_source.html#l00085">GetValue()</a>.</p>
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<td class="memname">const int impala::BitReader::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_8h_source.html#l00127">127</a> of file <a class="el" href="bit-stream-utils_8h_source.html">bit-stream-utils.h</a>.</p>
<p>Referenced by <a class="el" href="bit-stream-utils_8inline_8h_source.html#l00136">GetVlqInt()</a>, and <a class="el" href="rle-encoding_8h_source.html#l00132">impala::RleEncoder::MinBufferSize()</a>.</p>
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<hr/>The documentation for this class was generated from the following files:<ul>
<li>be/src/util/<a class="el" href="bit-stream-utils_8h_source.html">bit-stream-utils.h</a></li>
<li>be/src/util/<a class="el" href="bit-stream-utils_8inline_8h_source.html">bit-stream-utils.inline.h</a></li>
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