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hash_crc64.htm
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<!DOCTYPE html>
<html lang="en">
<head profile="http://a9.com/-/spec/opensearch/1.1/">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link href="../assets/site.css" rel="stylesheet">
<title>hash/crc64</title>
</head>
<body>
<div class="container">
<h2 id="pkg-overview">package crc64</h2>
<p><code>import "hash/crc64"</code>
<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> for
information.</p>
<h3 id="pkg-index" class="section-header">Index <a class="permalink" href="#pkg-index">¶</a></h3>
<a href="../main.html"><h3>返回首页</h3></a>
</br>
<li><a href="#pkg-constants">Constants</a></li>
<li><a href="#Table">type Table</a></li>
<ul>
<li><a href="#MakeTable">func MakeTable(poly uint64) *Table</a></li>
</ul>
<li><a href="#Checksum">func Checksum(data []byte, tab *Table) uint64</a></li>
<li><a href="#Update">func Update(crc uint64, tab *Table, p []byte) uint64</a></li>
<li><a href="#New">func New(tab *Table) hash.Hash64</a></li>
</ul>
<h3 id="pkg-constants">Constants <a class="permalink" href="#pkg-index">¶</a></h3>
<pre>const (
<span class="com">// ISO 3309定义的ISO多项式，用于HDLC</span>
<span id="ISO">ISO</span> = 0xD800000000000000
<span class="com">// ECMA 182定义的ECMA多项式</span>
<span id="ECMA">ECMA</span> = 0xC96C5795D7870F42
)</pre>
<p>预定义的多项式。</p>
<pre>const <span id="Size">Size</span> = 8</pre>
<p>CRC-64校验和的字节数。</p>
<h3 id="Table">type <a title="View Source" href="https://github.com/golang/go/blob/master/src/hash/crc64/crc64.go?name=release#25">Table</a> <a class="permalink" href="#pkg-index">¶</a></h3>
<pre>type Table [256]<a href="builtin.htm#uint64">uint64</a></pre>
<p>长度256的uint64切片，代表一个用于高效运作的多项式。</p>
<h4 id="MakeTable">func <a title="View Source" href="https://github.com/golang/go/blob/master/src/hash/crc64/crc64.go?name=release#28">MakeTable</a> <a class="permalink" href="#pkg-index">¶</a></h4>
<pre class="funcdecl">func MakeTable(poly <a href="builtin.htm#uint64">uint64</a>) *<a href="#Table">Table</a></pre>
<p>返回一个代表poly指定的多项式的*Table。</p>
<h3 id="Checksum">func <a title="View Source" href="https://github.com/golang/go/blob/master/src/hash/crc64/crc64.go?name=release#87">Checksum</a> <a class="permalink" href="#pkg-index">¶</a></h3>
<pre class="funcdecl">func Checksum(data []<a href="builtin.htm#byte">byte</a>, tab *<a href="#Table">Table</a>) <a href="builtin.htm#uint64">uint64</a></pre>
<p>返回数据data使用tab代表的多项式计算出的CRC-64校验和。</p>
<h3 id="Update">func <a title="View Source" href="https://github.com/golang/go/blob/master/src/hash/crc64/crc64.go?name=release#69">Update</a> <a class="permalink" href="#pkg-index">¶</a></h3>
<pre class="funcdecl">func Update(crc <a href="builtin.htm#uint64">uint64</a>, tab *<a href="#Table">Table</a>, p []<a href="builtin.htm#byte">byte</a>) <a href="builtin.htm#uint64">uint64</a></pre>
<p>返回将切片p的数据采用tab表示的多项式添加到crc之后计算出的新校验和。</p>
<h3 id="New">func <a title="View Source" href="https://github.com/golang/go/blob/master/src/hash/crc64/crc64.go?name=release#52">New</a> <a class="permalink" href="#pkg-index">¶</a></h3>
<pre class="funcdecl">func New(tab *<a href="#Table">Table</a>) <a href="hash.htm">hash</a>.<a href="hash.htm#Hash64">Hash64</a></pre>
<p>创建一个使用tab代表的多项式计算CRC-64校验和的hash.Hash64接口。</p>
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