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  7. <title>adler32 - The Go Programming Language</title>
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  17. <div class="top-heading" id="heading-wide"><a href="http://localhost:6060/">The Go Programming Language</a></div>
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  33. <h1>Package adler32</h1>
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  35. <!--
  36. Copyright 2009 The Go Authors. All rights reserved.
  37. Use of this source code is governed by a BSD-style
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  47. document.ANALYSIS_DATA = null;
  48. document.CALLGRAPH = null;
  49. </script>
  50. <div id="short-nav">
  51. <dl>
  52. <dd><code>import "hash/adler32"</code></dd>
  53. </dl>
  54. <dl>
  55. <dd><a href="index.html#pkg-overview" class="overviewLink">Overview</a></dd>
  56. <dd><a href="index.html#pkg-index" class="indexLink">Index</a></dd>
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  64. <div class="expanded">
  65. <h2 class="toggleButton" title="Click to hide Overview section">Overview ▾</h2>
  66. <p>
  67. Package adler32 implements the Adler-32 checksum.
  68. </p>
  69. <p>
  70. It is defined in RFC 1950:
  71. </p>
  72. <pre>Adler-32 is composed of two sums accumulated per byte: s1 is
  73. the sum of all bytes, s2 is the sum of all s1 values. Both sums
  74. are done modulo 65521. s1 is initialized to 1, s2 to zero. The
  75. Adler-32 checksum is stored as s2*65536 + s1 in most-
  76. significant-byte first (network) order.
  77. </pre>
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  79. </div>
  80. <div id="pkg-index" class="toggleVisible">
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  82. <h2 class="toggleButton" title="Click to show Index section">Index ▹</h2>
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  86. <!-- Table of contents for API; must be named manual-nav to turn off auto nav. -->
  87. <div id="manual-nav">
  88. <dl>
  89. <dd><a href="index.html#pkg-constants">Constants</a></dd>
  90. <dd><a href="index.html#Checksum">func Checksum(data []byte) uint32</a></dd>
  91. <dd><a href="index.html#New">func New() hash.Hash32</a></dd>
  92. </dl>
  93. </div><!-- #manual-nav -->
  94. <h4>Package files</h4>
  95. <p>
  96. <span style="font-size:90%">
  97. <a href="http://localhost:6060/src/hash/adler32/adler32.go">adler32.go</a>
  98. </span>
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  107. <h2 class="toggleButton" title="Click to hide Internal Call Graph section">Internal call graph ▾</h2>
  108. <p>
  109. In the call graph viewer below, each node
  110. is a function belonging to this package
  111. and its children are the functions it
  112. calls&mdash;perhaps dynamically.
  113. </p>
  114. <p>
  115. The root nodes are the entry points of the
  116. package: functions that may be called from
  117. outside the package.
  118. There may be non-exported or anonymous
  119. functions among them if they are called
  120. dynamically from another package.
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  122. <p>
  123. Click a node to visit that function's source code.
  124. From there you can visit its callers by
  125. clicking its declaring <code>func</code>
  126. token.
  127. </p>
  128. <p>
  129. Functions may be omitted if they were
  130. determined to be unreachable in the
  131. particular programs or tests that were
  132. analyzed.
  133. </p>
  134. <!-- Zero means show all package entry points. -->
  135. <ul style="margin-left: 0.5in" id="callgraph-0" class="treeview"></ul>
  136. </div>
  137. </div> <!-- #pkg-callgraph -->
  138. <h2 id="pkg-constants">Constants</h2>
  139. <pre>const <span id="Size">Size</span> = 4</pre>
  140. <p>
  141. The size of an Adler-32 checksum in bytes.
  142. </p>
  143. <h2 id="Checksum">func <a href="http://localhost:6060/src/hash/adler32/adler32.go?s=1994:2027#L69">Checksum</a></h2>
  144. <pre>func Checksum(data []<a href="../../builtin/index.html#byte">byte</a>) <a href="../../builtin/index.html#uint32">uint32</a></pre>
  145. <p>
  146. Checksum returns the Adler-32 checksum of data.
  147. </p>
  148. <h2 id="New">func <a href="http://localhost:6060/src/hash/adler32/adler32.go?s=1172:1194#L27">New</a></h2>
  149. <pre>func New() <a href="../index.html">hash</a>.<a href="../index.html#Hash32">Hash32</a></pre>
  150. <p>
  151. New returns a new hash.Hash32 computing the Adler-32 checksum.
  152. Its Sum method will lay the value out in big-endian byte order.
  153. </p>
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