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<p>Abstract wrappers around different weaksum and strongsum implementations.
<a href="#details">More...</a></p>
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Include dependency graph for checksum.h:</div>
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<p><a href="checksum_8h_source.html">Go to the source code of this file.</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="nested-classes" name="nested-classes"></a>
Data Structures</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structweaksum.html">weaksum</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Abstract wrapper around weaksum implementations. <a href="structweaksum.html#details">More...</a><br /></td></tr>
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</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="typedef-members" name="typedef-members"></a>
Typedefs</h2></td></tr>
<tr class="memitem:a6a8a4dd89feaf9852455fb96bdca8aba"><td class="memItemLeft" align="right" valign="top">typedef struct <a class="el" href="structweaksum.html">weaksum</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="checksum_8h.html#a6a8a4dd89feaf9852455fb96bdca8aba">weaksum_t</a></td></tr>
<tr class="memdesc:a6a8a4dd89feaf9852455fb96bdca8aba"><td class="mdescLeft"> </td><td class="mdescRight">Abstract wrapper around weaksum implementations. <a href="checksum_8h.html#a6a8a4dd89feaf9852455fb96bdca8aba">More...</a><br /></td></tr>
<tr class="separator:a6a8a4dd89feaf9852455fb96bdca8aba"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="enum-members" name="enum-members"></a>
Enumerations</h2></td></tr>
<tr class="memitem:a523b170a7d10ae0b00117c2761abaf8d"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="checksum_8h.html#a523b170a7d10ae0b00117c2761abaf8d">weaksum_kind_t</a> { <b>RS_ROLLSUM</b>
, <b>RS_RABINKARP</b>
}</td></tr>
<tr class="memdesc:a523b170a7d10ae0b00117c2761abaf8d"><td class="mdescLeft"> </td><td class="mdescRight">Weaksum implementations. <a href="checksum_8h.html#a523b170a7d10ae0b00117c2761abaf8d">More...</a><br /></td></tr>
<tr class="separator:a523b170a7d10ae0b00117c2761abaf8d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a358cb59b26ba2585bc2094b4da2a547d"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="checksum_8h.html#a358cb59b26ba2585bc2094b4da2a547d">strongsum_kind_t</a> { <b>RS_MD4</b>
, <b>RS_BLAKE2</b>
}</td></tr>
<tr class="memdesc:a358cb59b26ba2585bc2094b4da2a547d"><td class="mdescLeft"> </td><td class="mdescRight">Strongsum implementations. <a href="checksum_8h.html#a358cb59b26ba2585bc2094b4da2a547d">More...</a><br /></td></tr>
<tr class="separator:a358cb59b26ba2585bc2094b4da2a547d"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="func-members" name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:a4762992b0d062f082bb9619addd6da14"><td class="memItemLeft" align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="checksum_8h.html#a4762992b0d062f082bb9619addd6da14">weaksum_reset</a> (<a class="el" href="checksum_8h.html#a6a8a4dd89feaf9852455fb96bdca8aba">weaksum_t</a> *sum)</td></tr>
<tr class="separator:a4762992b0d062f082bb9619addd6da14"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a12db55745b883b7e117fb8f5519629d1"><td class="memItemLeft" align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="checksum_8h.html#a12db55745b883b7e117fb8f5519629d1">weaksum_init</a> (<a class="el" href="checksum_8h.html#a6a8a4dd89feaf9852455fb96bdca8aba">weaksum_t</a> *sum, <a class="el" href="checksum_8h.html#a523b170a7d10ae0b00117c2761abaf8d">weaksum_kind_t</a> kind)</td></tr>
<tr class="separator:a12db55745b883b7e117fb8f5519629d1"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:af5389595b1190670688cf904673cccc6"><td class="memItemLeft" align="right" valign="top">static size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="checksum_8h.html#af5389595b1190670688cf904673cccc6">weaksum_count</a> (<a class="el" href="checksum_8h.html#a6a8a4dd89feaf9852455fb96bdca8aba">weaksum_t</a> *sum)</td></tr>
<tr class="separator:af5389595b1190670688cf904673cccc6"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a97ddaee8fc505579b3015b985451aacf"><td class="memItemLeft" align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="checksum_8h.html#a97ddaee8fc505579b3015b985451aacf">weaksum_update</a> (<a class="el" href="checksum_8h.html#a6a8a4dd89feaf9852455fb96bdca8aba">weaksum_t</a> *sum, const unsigned char *buf, size_t len)</td></tr>
<tr class="separator:a97ddaee8fc505579b3015b985451aacf"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ac01962ceae6b783e7580d2d7ef506cd8"><td class="memItemLeft" align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="checksum_8h.html#ac01962ceae6b783e7580d2d7ef506cd8">weaksum_rotate</a> (<a class="el" href="checksum_8h.html#a6a8a4dd89feaf9852455fb96bdca8aba">weaksum_t</a> *sum, unsigned char out, unsigned char in)</td></tr>
<tr class="separator:ac01962ceae6b783e7580d2d7ef506cd8"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a9aa0eeb5126f69d6416619d2d37b7bd3"><td class="memItemLeft" align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="checksum_8h.html#a9aa0eeb5126f69d6416619d2d37b7bd3">weaksum_rollin</a> (<a class="el" href="checksum_8h.html#a6a8a4dd89feaf9852455fb96bdca8aba">weaksum_t</a> *sum, unsigned char in)</td></tr>
<tr class="separator:a9aa0eeb5126f69d6416619d2d37b7bd3"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a55999c35253afe799ce1c5210a04f892"><td class="memItemLeft" align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="checksum_8h.html#a55999c35253afe799ce1c5210a04f892">weaksum_rollout</a> (<a class="el" href="checksum_8h.html#a6a8a4dd89feaf9852455fb96bdca8aba">weaksum_t</a> *sum, unsigned char out)</td></tr>
<tr class="separator:a55999c35253afe799ce1c5210a04f892"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a73ed806f1b3e9d11621a30cfb4a4efea"><td class="memItemLeft" align="right" valign="top">static rs_weak_sum_t </td><td class="memItemRight" valign="bottom"><a class="el" href="checksum_8h.html#a73ed806f1b3e9d11621a30cfb4a4efea">weaksum_digest</a> (<a class="el" href="checksum_8h.html#a6a8a4dd89feaf9852455fb96bdca8aba">weaksum_t</a> *sum)</td></tr>
<tr class="separator:a73ed806f1b3e9d11621a30cfb4a4efea"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a25c2d070f333e27ee30831f05bc77c65"><td class="memItemLeft" align="right" valign="top">rs_weak_sum_t </td><td class="memItemRight" valign="bottom"><a class="el" href="checksum_8h.html#a25c2d070f333e27ee30831f05bc77c65">rs_calc_weak_sum</a> (<a class="el" href="checksum_8h.html#a523b170a7d10ae0b00117c2761abaf8d">weaksum_kind_t</a> kind, void const *buf, size_t len)</td></tr>
<tr class="memdesc:a25c2d070f333e27ee30831f05bc77c65"><td class="mdescLeft"> </td><td class="mdescRight">Calculate a weaksum. <a href="checksum_8h.html#a25c2d070f333e27ee30831f05bc77c65">More...</a><br /></td></tr>
<tr class="separator:a25c2d070f333e27ee30831f05bc77c65"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aca0ef7069e47972313f74f66d9c29298"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="checksum_8h.html#aca0ef7069e47972313f74f66d9c29298">rs_calc_strong_sum</a> (<a class="el" href="checksum_8h.html#a358cb59b26ba2585bc2094b4da2a547d">strongsum_kind_t</a> kind, void const *buf, size_t len, rs_strong_sum_t *sum)</td></tr>
<tr class="memdesc:aca0ef7069e47972313f74f66d9c29298"><td class="mdescLeft"> </td><td class="mdescRight">Calculate a strongsum. <a href="checksum_8h.html#aca0ef7069e47972313f74f66d9c29298">More...</a><br /></td></tr>
<tr class="separator:aca0ef7069e47972313f74f66d9c29298"><td class="memSeparator" colspan="2"> </td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p >Abstract wrappers around different weaksum and strongsum implementations. </p>
<p class="definition">Definition in file <a class="el" href="checksum_8h_source.html">checksum.h</a>.</p>
</div><h2 class="groupheader">Typedef Documentation</h2>
<a id="a6a8a4dd89feaf9852455fb96bdca8aba" name="a6a8a4dd89feaf9852455fb96bdca8aba"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a6a8a4dd89feaf9852455fb96bdca8aba">◆ </a></span>weaksum_t</h2>
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<td class="memname">typedef struct <a class="el" href="structweaksum.html">weaksum</a> <a class="el" href="checksum_8h.html#a6a8a4dd89feaf9852455fb96bdca8aba">weaksum_t</a></td>
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</div><div class="memdoc">
<p>Abstract wrapper around weaksum implementations. </p>
<p >This is a polymorphic interface to the different rollsum implementations.</p>
<p >Historically rollsum methods were implemented as static inline functions because they were small and needed to be fast. Now that we need to call different methods for different rollsum implementations, they are getting more complicated. Is it better to delegate calls to the right implementation using static inline switch statements, or stop inlining them and use virtual method pointers? Tests suggest inlined switch statements is faster. </p>
</div>
</div>
<h2 class="groupheader">Enumeration Type Documentation</h2>
<a id="a523b170a7d10ae0b00117c2761abaf8d" name="a523b170a7d10ae0b00117c2761abaf8d"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a523b170a7d10ae0b00117c2761abaf8d">◆ </a></span>weaksum_kind_t</h2>
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<td class="memname">enum <a class="el" href="checksum_8h.html#a523b170a7d10ae0b00117c2761abaf8d">weaksum_kind_t</a></td>
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<p>Weaksum implementations. </p>
<p class="definition">Definition at line <a class="el" href="checksum_8h_source.html#l00035">35</a> of file <a class="el" href="checksum_8h_source.html">checksum.h</a>.</p>
</div>
</div>
<a id="a358cb59b26ba2585bc2094b4da2a547d" name="a358cb59b26ba2585bc2094b4da2a547d"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a358cb59b26ba2585bc2094b4da2a547d">◆ </a></span>strongsum_kind_t</h2>
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<td class="memname">enum <a class="el" href="checksum_8h.html#a358cb59b26ba2585bc2094b4da2a547d">strongsum_kind_t</a></td>
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<p>Strongsum implementations. </p>
<p class="definition">Definition at line <a class="el" href="checksum_8h_source.html#l00041">41</a> of file <a class="el" href="checksum_8h_source.html">checksum.h</a>.</p>
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<h2 class="groupheader">Function Documentation</h2>
<a id="a4762992b0d062f082bb9619addd6da14" name="a4762992b0d062f082bb9619addd6da14"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a4762992b0d062f082bb9619addd6da14">◆ </a></span>weaksum_reset()</h2>
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<td class="memname">static void weaksum_reset </td>
<td>(</td>
<td class="paramtype"><a class="el" href="checksum_8h.html#a6a8a4dd89feaf9852455fb96bdca8aba">weaksum_t</a> * </td>
<td class="paramname"><em>sum</em></td><td>)</td>
<td></td>
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<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">static</span></span> </td>
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<p class="definition">Definition at line <a class="el" href="checksum_8h_source.html#l00064">64</a> of file <a class="el" href="checksum_8h_source.html">checksum.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a12db55745b883b7e117fb8f5519629d1">◆ </a></span>weaksum_init()</h2>
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<td class="memname">static void weaksum_init </td>
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<td class="paramtype"><a class="el" href="checksum_8h.html#a6a8a4dd89feaf9852455fb96bdca8aba">weaksum_t</a> * </td>
<td class="paramname"><em>sum</em>, </td>
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<td class="paramtype"><a class="el" href="checksum_8h.html#a523b170a7d10ae0b00117c2761abaf8d">weaksum_kind_t</a> </td>
<td class="paramname"><em>kind</em> </td>
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<p class="definition">Definition at line <a class="el" href="checksum_8h_source.html#l00072">72</a> of file <a class="el" href="checksum_8h_source.html">checksum.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#af5389595b1190670688cf904673cccc6">◆ </a></span>weaksum_count()</h2>
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<td class="memname">static size_t weaksum_count </td>
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<td class="paramtype"><a class="el" href="checksum_8h.html#a6a8a4dd89feaf9852455fb96bdca8aba">weaksum_t</a> * </td>
<td class="paramname"><em>sum</em></td><td>)</td>
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<p class="definition">Definition at line <a class="el" href="checksum_8h_source.html#l00079">79</a> of file <a class="el" href="checksum_8h_source.html">checksum.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a97ddaee8fc505579b3015b985451aacf">◆ </a></span>weaksum_update()</h2>
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<td class="memname">static void weaksum_update </td>
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<td class="paramtype"><a class="el" href="checksum_8h.html#a6a8a4dd89feaf9852455fb96bdca8aba">weaksum_t</a> * </td>
<td class="paramname"><em>sum</em>, </td>
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<p class="definition">Definition at line <a class="el" href="checksum_8h_source.html#l00085">85</a> of file <a class="el" href="checksum_8h_source.html">checksum.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ac01962ceae6b783e7580d2d7ef506cd8">◆ </a></span>weaksum_rotate()</h2>
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<td class="memname">static void weaksum_rotate </td>
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<td class="paramtype"><a class="el" href="checksum_8h.html#a6a8a4dd89feaf9852455fb96bdca8aba">weaksum_t</a> * </td>
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<p class="definition">Definition at line <a class="el" href="checksum_8h_source.html#l00094">94</a> of file <a class="el" href="checksum_8h_source.html">checksum.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a9aa0eeb5126f69d6416619d2d37b7bd3">◆ </a></span>weaksum_rollin()</h2>
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<td class="memname">static void weaksum_rollin </td>
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<p class="definition">Definition at line <a class="el" href="checksum_8h_source.html#l00103">103</a> of file <a class="el" href="checksum_8h_source.html">checksum.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a55999c35253afe799ce1c5210a04f892">◆ </a></span>weaksum_rollout()</h2>
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<td class="memname">static void weaksum_rollout </td>
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<td class="paramtype"><a class="el" href="checksum_8h.html#a6a8a4dd89feaf9852455fb96bdca8aba">weaksum_t</a> * </td>
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<p class="definition">Definition at line <a class="el" href="checksum_8h_source.html#l00111">111</a> of file <a class="el" href="checksum_8h_source.html">checksum.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a73ed806f1b3e9d11621a30cfb4a4efea">◆ </a></span>weaksum_digest()</h2>
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<p class="definition">Definition at line <a class="el" href="checksum_8h_source.html#l00119">119</a> of file <a class="el" href="checksum_8h_source.html">checksum.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a25c2d070f333e27ee30831f05bc77c65">◆ </a></span>rs_calc_weak_sum()</h2>
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<td class="memname">rs_weak_sum_t rs_calc_weak_sum </td>
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<td class="paramtype"><a class="el" href="checksum_8h.html#a523b170a7d10ae0b00117c2761abaf8d">weaksum_kind_t</a> </td>
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<p>Calculate a weaksum. </p>
<p >Note this does not apply <a class="el" href="hashtable_8h.html#ac1bb2e17d20ca0fc08ab9e02ecaa698f" title="MurmurHash3 finalization mix function.">mix32()</a> to rollsum digests, unlike weaksum_digest(). This is because rollsums are stored raw without <a class="el" href="hashtable_8h.html#ac1bb2e17d20ca0fc08ab9e02ecaa698f" title="MurmurHash3 finalization mix function.">mix32()</a> applied for backwards-compatibility, but we apply <a class="el" href="hashtable_8h.html#ac1bb2e17d20ca0fc08ab9e02ecaa698f" title="MurmurHash3 finalization mix function.">mix32()</a> when adding them into a signature and when getting the digest for calculating deltas.</p>
<p >Calculate a weaksum. </p>
<p class="definition">Definition at line <a class="el" href="checksum_8c_source.html#l00034">34</a> of file <a class="el" href="checksum_8c_source.html">checksum.c</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#aca0ef7069e47972313f74f66d9c29298">◆ </a></span>rs_calc_strong_sum()</h2>
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<p>Calculate a strongsum. </p>
<p >Calculate a strongsum.</p>
<p >In plain rsync, the checksum is perturbed by a seed value. This is used when retrying a failed transmission: we've discovered that the hashes collided at some point, so we're going to try again with different hashes to see if we can get it right. (Check tridge's thesis for details and to see if that's correct.)</p>
<p >Since we can't retry I'm not sure if it's very useful for librsync, except perhaps as protection against hash collision attacks. </p>
<p class="definition">Definition at line <a class="el" href="checksum_8c_source.html#l00059">59</a> of file <a class="el" href="checksum_8c_source.html">checksum.c</a>.</p>
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