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<h1>Package crc64</h1>
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<div id="short-nav"> <dl> <dd><code>import "hash/crc64"</code></dd> </dl> <dl> <dd><a href="index.html#pkg-overview" class="overviewLink">Overview</a></dd> <dd><a href="index.html#pkg-index" class="indexLink">Index</a></dd> </dl> </div> <!-- The package's Name is printed as title by the top-level template --> <div id="pkg-overview" class="toggleVisible"> <div class="collapsed"> <h2 class="toggleButton" title="Click to show Overview section">Overview ▹</h2> </div> <div class="expanded"> <h2 class="toggleButton" title="Click to hide Overview section">Overview ▾</h2> <p>Package crc64 implements the 64-bit cyclic redundancy check, or CRC-64,checksum. See <a href="http://en.wikipedia.org/wiki/Cyclic_redundancy_check">http://en.wikipedia.org/wiki/Cyclic_redundancy_check</a> forinformation.</p>
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<!-- Table of contents for API; must be named manual-nav to turn off auto nav. --> <div id="manual-nav"> <dl> <dd><a href="index.html#pkg-constants">Constants</a></dd> <dd><a href="index.html#Checksum">func Checksum(data []byte, tab *Table) uint64</a></dd> <dd><a href="index.html#New">func New(tab *Table) hash.Hash64</a></dd> <dd><a href="index.html#Update">func Update(crc uint64, tab *Table, p []byte) uint64</a></dd> <dd><a href="index.html#Table">type Table</a></dd> <dd> <a href="index.html#MakeTable">func MakeTable(poly uint64) *Table</a></dd> </dl> </div><!-- #manual-nav -->
<h4>Package files</h4> <p> <span style="font-size:90%"> <a href="http://localhost:6060/src/hash/crc64/crc64.go">crc64.go</a> </span> </p> </div><!-- .expanded --> </div><!-- #pkg-index -->
<div id="pkg-callgraph" class="toggle" style="display: none"> <div class="collapsed"> <h2 class="toggleButton" title="Click to show Internal Call Graph section">Internal call graph ▹</h2> </div> <!-- .expanded --> <div class="expanded"> <h2 class="toggleButton" title="Click to hide Internal Call Graph section">Internal call graph ▾</h2> <p> In the call graph viewer below, each node is a function belonging to this package and its children are the functions it calls—perhaps dynamically. </p> <p> The root nodes are the entry points of the package: functions that may be called from outside the package. There may be non-exported or anonymous functions among them if they are called dynamically from another package. </p> <p> Click a node to visit that function's source code. From there you can visit its callers by clicking its declaring <code>func</code> token. </p> <p> Functions may be omitted if they were determined to be unreachable in the particular programs or tests that were analyzed. </p> <!-- Zero means show all package entry points. --> <ul style="margin-left: 0.5in" id="callgraph-0" class="treeview"></ul> </div> </div> <!-- #pkg-callgraph -->
<h2 id="pkg-constants">Constants</h2> <pre>const ( <span class="comment">// The ISO polynomial, defined in ISO 3309 and used in HDLC.</span> <span id="ISO">ISO</span> = 0xD800000000000000
<span class="comment">// The ECMA polynomial, defined in ECMA 182.</span> <span id="ECMA">ECMA</span> = 0xC96C5795D7870F42)</pre> <p>Predefined polynomials.</p>
<pre>const <span id="Size">Size</span> = 8</pre> <p>The size of a CRC-64 checksum in bytes.</p>
<h2 id="Checksum">func <a href="http://localhost:6060/src/hash/crc64/crc64.go?s=2299:2344#L79">Checksum</a></h2> <pre>func Checksum(data []<a href="../../builtin/index.html#byte">byte</a>, tab *<a href="index.html#Table">Table</a>) <a href="../../builtin/index.html#uint64">uint64</a></pre> <p>Checksum returns the CRC-64 checksum of datausing the polynomial represented by the Table.</p>
<h2 id="New">func <a href="http://localhost:6060/src/hash/crc64/crc64.go?s=1371:1403#L44">New</a></h2> <pre>func New(tab *<a href="index.html#Table">Table</a>) <a href="../index.html">hash</a>.<a href="../index.html#Hash64">Hash64</a></pre> <p>New creates a new hash.Hash64 computing the CRC-64 checksumusing the polynomial represented by the Table.Its Sum method will lay the value out in big-endian byte order.</p>
<h2 id="Update">func <a href="http://localhost:6060/src/hash/crc64/crc64.go?s=1777:1829#L61">Update</a></h2> <pre>func Update(crc <a href="../../builtin/index.html#uint64">uint64</a>, tab *<a href="index.html#Table">Table</a>, p []<a href="../../builtin/index.html#byte">byte</a>) <a href="../../builtin/index.html#uint64">uint64</a></pre> <p>Update returns the result of adding the bytes in p to the crc.</p>
<h2 id="Table">type <a href="http://localhost:6060/src/hash/crc64/crc64.go?s=697:719#L15">Table</a></h2> <pre>type Table [256]<a href="../../builtin/index.html#uint64">uint64</a></pre> <p>Table is a 256-word table representing the polynomial for efficient processing.</p>
<h3 id="MakeTable">func <a href="http://localhost:6060/src/hash/crc64/crc64.go?s=845:879#L19">MakeTable</a></h3> <pre>func MakeTable(poly <a href="../../builtin/index.html#uint64">uint64</a>) *<a href="index.html#Table">Table</a></pre> <p>MakeTable returns a Table constructed from the specified polynomial.The contents of this Table must not be modified.</p>
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