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<title>BitSource (ZXing 3.5.4 API)</title>
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<p>Summary:</p>
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<div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">com.google.zxing.common</a></div>
<h1 title="Class BitSource" class="title">Class BitSource</h1>
</div>
<div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a>
<div class="inheritance">com.google.zxing.common.BitSource</div>
</div>
<section class="class-description" id="class-description">
<hr>
<div class="type-signature"><span class="modifiers">public final class </span><span class="element-name type-name-label">BitSource</span>
<span class="extends-implements">extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></span></div>
<div class="block"><p>This provides an easy abstraction to read bits at a time from a sequence of bytes, where the
number of bits read is not often a multiple of 8.</p>
<p>This class is thread-safe but not reentrant -- unless the caller modifies the bytes array
it passed in, in which case all bets are off.</p></div>
<dl class="notes">
<dt>Author:</dt>
<dd>Sean Owen</dd>
</dl>
</section>
<section class="summary">
<ul class="summary-list">
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
<li>
<section class="constructor-summary" id="constructor-summary">
<h2>Constructor Summary</h2>
<div class="caption"><span>Constructors</span></div>
<div class="summary-table two-column-summary">
<div class="table-header col-first">Constructor</div>
<div class="table-header col-last">Description</div>
<div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E(byte%5B%5D)" class="member-name-link">BitSource</a><wbr>(byte[] bytes)</code></div>
<div class="col-last even-row-color"> </div>
</div>
</section>
</li>
<!-- ========== METHOD SUMMARY =========== -->
<li>
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<h2>Method Summary</h2>
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<div class="table-header col-first">Modifier and Type</div>
<div class="table-header col-second">Method</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>int</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#available()" class="member-name-link">available</a>()</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> </div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>int</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getBitOffset()" class="member-name-link">getBitOffset</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> </div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>int</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getByteOffset()" class="member-name-link">getByteOffset</a>()</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> </div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>int</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#readBits(int)" class="member-name-link">readBits</a><wbr>(int numBits)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> </div>
</div>
</div>
</div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3>
<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#clone--" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#equals-java.lang.Object-" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#finalize--" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#getClass--" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#hashCode--" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#notify--" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#notifyAll--" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#toString--" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-" title="class or interface in java.lang" class="external-link">wait</a></code></div>
</section>
</li>
</ul>
</section>
<section class="details">
<ul class="details-list">
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<li>
<section class="constructor-details" id="constructor-detail">
<h2>Constructor Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="<init>(byte[])">
<h3>BitSource</h3>
<div class="member-signature"><span class="modifiers">public</span> <span class="element-name">BitSource</span><wbr><span class="parameters">(byte[] bytes)</span></div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>bytes</code> - bytes from which this will read bits. Bits will be read from the first byte first.
Bits are read within a byte from most-significant to least-significant bit.</dd>
</dl>
</section>
</li>
</ul>
</section>
</li>
<!-- ============ METHOD DETAIL ========== -->
<li>
<section class="method-details" id="method-detail">
<h2>Method Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="getBitOffset()">
<h3>getBitOffset</h3>
<div class="member-signature"><span class="modifiers">public</span> <span class="return-type">int</span> <span class="element-name">getBitOffset</span>()</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>index of next bit in current byte which would be read by the next call to <a href="#readBits(int)"><code>readBits(int)</code></a>.</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="getByteOffset()">
<h3>getByteOffset</h3>
<div class="member-signature"><span class="modifiers">public</span> <span class="return-type">int</span> <span class="element-name">getByteOffset</span>()</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>index of next byte in input byte array which would be read by the next call to <a href="#readBits(int)"><code>readBits(int)</code></a>.</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="readBits(int)">
<h3>readBits</h3>
<div class="member-signature"><span class="modifiers">public</span> <span class="return-type">int</span> <span class="element-name">readBits</span><wbr><span class="parameters">(int numBits)</span></div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>numBits</code> - number of bits to read</dd>
<dt>Returns:</dt>
<dd>int representing the bits read. The bits will appear as the least-significant
bits of the int</dd>
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="external-link">IllegalArgumentException</a></code> - if numBits isn't in [1,32] or more than is available</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="available()">
<h3>available</h3>
<div class="member-signature"><span class="modifiers">public</span> <span class="return-type">int</span> <span class="element-name">available</span>()</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>number of bits that can be read successfully</dd>
</dl>
</section>
</li>
</ul>
</section>
</li>
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</section>
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