| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `common/rusty_leveldb_sgx/src/cmp.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>cmp.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../rusty_leveldb/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../rusty_leveldb/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
| <span id="2">2</span> |
| <span id="3">3</span> |
| <span id="4">4</span> |
| <span id="5">5</span> |
| <span id="6">6</span> |
| <span id="7">7</span> |
| <span id="8">8</span> |
| <span id="9">9</span> |
| <span id="10">10</span> |
| <span id="11">11</span> |
| <span id="12">12</span> |
| <span id="13">13</span> |
| <span id="14">14</span> |
| <span id="15">15</span> |
| <span id="16">16</span> |
| <span id="17">17</span> |
| <span id="18">18</span> |
| <span id="19">19</span> |
| <span id="20">20</span> |
| <span id="21">21</span> |
| <span id="22">22</span> |
| <span id="23">23</span> |
| <span id="24">24</span> |
| <span id="25">25</span> |
| <span id="26">26</span> |
| <span id="27">27</span> |
| <span id="28">28</span> |
| <span id="29">29</span> |
| <span id="30">30</span> |
| <span id="31">31</span> |
| <span id="32">32</span> |
| <span id="33">33</span> |
| <span id="34">34</span> |
| <span id="35">35</span> |
| <span id="36">36</span> |
| <span id="37">37</span> |
| <span id="38">38</span> |
| <span id="39">39</span> |
| <span id="40">40</span> |
| <span id="41">41</span> |
| <span id="42">42</span> |
| <span id="43">43</span> |
| <span id="44">44</span> |
| <span id="45">45</span> |
| <span id="46">46</span> |
| <span id="47">47</span> |
| <span id="48">48</span> |
| <span id="49">49</span> |
| <span id="50">50</span> |
| <span id="51">51</span> |
| <span id="52">52</span> |
| <span id="53">53</span> |
| <span id="54">54</span> |
| <span id="55">55</span> |
| <span id="56">56</span> |
| <span id="57">57</span> |
| <span id="58">58</span> |
| <span id="59">59</span> |
| <span id="60">60</span> |
| <span id="61">61</span> |
| <span id="62">62</span> |
| <span id="63">63</span> |
| <span id="64">64</span> |
| <span id="65">65</span> |
| <span id="66">66</span> |
| <span id="67">67</span> |
| <span id="68">68</span> |
| <span id="69">69</span> |
| <span id="70">70</span> |
| <span id="71">71</span> |
| <span id="72">72</span> |
| <span id="73">73</span> |
| <span id="74">74</span> |
| <span id="75">75</span> |
| <span id="76">76</span> |
| <span id="77">77</span> |
| <span id="78">78</span> |
| <span id="79">79</span> |
| <span id="80">80</span> |
| <span id="81">81</span> |
| <span id="82">82</span> |
| <span id="83">83</span> |
| <span id="84">84</span> |
| <span id="85">85</span> |
| <span id="86">86</span> |
| <span id="87">87</span> |
| <span id="88">88</span> |
| <span id="89">89</span> |
| <span id="90">90</span> |
| <span id="91">91</span> |
| <span id="92">92</span> |
| <span id="93">93</span> |
| <span id="94">94</span> |
| <span id="95">95</span> |
| <span id="96">96</span> |
| <span id="97">97</span> |
| <span id="98">98</span> |
| <span id="99">99</span> |
| <span id="100">100</span> |
| <span id="101">101</span> |
| <span id="102">102</span> |
| <span id="103">103</span> |
| <span id="104">104</span> |
| <span id="105">105</span> |
| <span id="106">106</span> |
| <span id="107">107</span> |
| <span id="108">108</span> |
| <span id="109">109</span> |
| <span id="110">110</span> |
| <span id="111">111</span> |
| <span id="112">112</span> |
| <span id="113">113</span> |
| <span id="114">114</span> |
| <span id="115">115</span> |
| <span id="116">116</span> |
| <span id="117">117</span> |
| <span id="118">118</span> |
| <span id="119">119</span> |
| <span id="120">120</span> |
| <span id="121">121</span> |
| <span id="122">122</span> |
| <span id="123">123</span> |
| <span id="124">124</span> |
| <span id="125">125</span> |
| <span id="126">126</span> |
| <span id="127">127</span> |
| <span id="128">128</span> |
| <span id="129">129</span> |
| <span id="130">130</span> |
| <span id="131">131</span> |
| <span id="132">132</span> |
| <span id="133">133</span> |
| <span id="134">134</span> |
| <span id="135">135</span> |
| <span id="136">136</span> |
| <span id="137">137</span> |
| <span id="138">138</span> |
| <span id="139">139</span> |
| <span id="140">140</span> |
| <span id="141">141</span> |
| <span id="142">142</span> |
| <span id="143">143</span> |
| <span id="144">144</span> |
| <span id="145">145</span> |
| <span id="146">146</span> |
| <span id="147">147</span> |
| <span id="148">148</span> |
| <span id="149">149</span> |
| <span id="150">150</span> |
| <span id="151">151</span> |
| <span id="152">152</span> |
| <span id="153">153</span> |
| <span id="154">154</span> |
| <span id="155">155</span> |
| <span id="156">156</span> |
| <span id="157">157</span> |
| <span id="158">158</span> |
| <span id="159">159</span> |
| <span id="160">160</span> |
| <span id="161">161</span> |
| <span id="162">162</span> |
| <span id="163">163</span> |
| <span id="164">164</span> |
| <span id="165">165</span> |
| <span id="166">166</span> |
| <span id="167">167</span> |
| <span id="168">168</span> |
| <span id="169">169</span> |
| <span id="170">170</span> |
| <span id="171">171</span> |
| <span id="172">172</span> |
| <span id="173">173</span> |
| <span id="174">174</span> |
| <span id="175">175</span> |
| <span id="176">176</span> |
| <span id="177">177</span> |
| <span id="178">178</span> |
| <span id="179">179</span> |
| <span id="180">180</span> |
| <span id="181">181</span> |
| <span id="182">182</span> |
| <span id="183">183</span> |
| <span id="184">184</span> |
| <span id="185">185</span> |
| <span id="186">186</span> |
| <span id="187">187</span> |
| <span id="188">188</span> |
| <span id="189">189</span> |
| <span id="190">190</span> |
| <span id="191">191</span> |
| <span id="192">192</span> |
| <span id="193">193</span> |
| <span id="194">194</span> |
| <span id="195">195</span> |
| <span id="196">196</span> |
| <span id="197">197</span> |
| <span id="198">198</span> |
| <span id="199">199</span> |
| <span id="200">200</span> |
| <span id="201">201</span> |
| <span id="202">202</span> |
| <span id="203">203</span> |
| <span id="204">204</span> |
| <span id="205">205</span> |
| <span id="206">206</span> |
| <span id="207">207</span> |
| <span id="208">208</span> |
| <span id="209">209</span> |
| <span id="210">210</span> |
| <span id="211">211</span> |
| <span id="212">212</span> |
| <span id="213">213</span> |
| <span id="214">214</span> |
| <span id="215">215</span> |
| <span id="216">216</span> |
| <span id="217">217</span> |
| <span id="218">218</span> |
| <span id="219">219</span> |
| <span id="220">220</span> |
| <span id="221">221</span> |
| <span id="222">222</span> |
| <span id="223">223</span> |
| <span id="224">224</span> |
| <span id="225">225</span> |
| <span id="226">226</span> |
| <span id="227">227</span> |
| <span id="228">228</span> |
| <span id="229">229</span> |
| <span id="230">230</span> |
| <span id="231">231</span> |
| <span id="232">232</span> |
| <span id="233">233</span> |
| <span id="234">234</span> |
| <span id="235">235</span> |
| <span id="236">236</span> |
| <span id="237">237</span> |
| <span id="238">238</span> |
| <span id="239">239</span> |
| <span id="240">240</span> |
| <span id="241">241</span> |
| <span id="242">242</span> |
| <span id="243">243</span> |
| <span id="244">244</span> |
| <span id="245">245</span> |
| <span id="246">246</span> |
| <span id="247">247</span> |
| <span id="248">248</span> |
| <span id="249">249</span> |
| <span id="250">250</span> |
| <span id="251">251</span> |
| <span id="252">252</span> |
| <span id="253">253</span> |
| <span id="254">254</span> |
| <span id="255">255</span> |
| <span id="256">256</span> |
| <span id="257">257</span> |
| <span id="258">258</span> |
| <span id="259">259</span> |
| <span id="260">260</span> |
| <span id="261">261</span> |
| <span id="262">262</span> |
| <span id="263">263</span> |
| <span id="264">264</span> |
| <span id="265">265</span> |
| <span id="266">266</span> |
| <span id="267">267</span> |
| <span id="268">268</span> |
| <span id="269">269</span> |
| <span id="270">270</span> |
| <span id="271">271</span> |
| <span id="272">272</span> |
| <span id="273">273</span> |
| <span id="274">274</span> |
| <span id="275">275</span> |
| <span id="276">276</span> |
| <span id="277">277</span> |
| <span id="278">278</span> |
| <span id="279">279</span> |
| <span id="280">280</span> |
| <span id="281">281</span> |
| <span id="282">282</span> |
| <span id="283">283</span> |
| <span id="284">284</span> |
| <span id="285">285</span> |
| <span id="286">286</span> |
| <span id="287">287</span> |
| <span id="288">288</span> |
| <span id="289">289</span> |
| <span id="290">290</span> |
| <span id="291">291</span> |
| <span id="292">292</span> |
| <span id="293">293</span> |
| <span id="294">294</span> |
| <span id="295">295</span> |
| <span id="296">296</span> |
| <span id="297">297</span> |
| <span id="298">298</span> |
| <span id="299">299</span> |
| <span id="300">300</span> |
| <span id="301">301</span> |
| <span id="302">302</span> |
| <span id="303">303</span> |
| <span id="304">304</span> |
| <span id="305">305</span> |
| <span id="306">306</span> |
| <span id="307">307</span> |
| <span id="308">308</span> |
| <span id="309">309</span> |
| <span id="310">310</span> |
| <span id="311">311</span> |
| <span id="312">312</span> |
| <span id="313">313</span> |
| <span id="314">314</span> |
| <span id="315">315</span> |
| <span id="316">316</span> |
| <span id="317">317</span> |
| <span id="318">318</span> |
| <span id="319">319</span> |
| <span id="320">320</span> |
| <span id="321">321</span> |
| <span id="322">322</span> |
| <span id="323">323</span> |
| </pre><pre class="rust"><code><span class="attribute">#![allow(clippy::many_single_char_names)] |
| |
| </span><span class="kw">use </span><span class="kw">crate</span>::key_types::{<span class="self">self</span>, LookupKey}; |
| <span class="kw">use </span><span class="kw">crate</span>::types; |
| |
| <span class="kw">use </span>std::cmp::Ordering; |
| <span class="kw">use </span>std::rc::Rc; |
| |
| <span class="kw">type </span>WrappedCmp = Rc<Box<<span class="kw">dyn </span>Cmp>>; |
| |
| <span class="doccomment">/// Comparator trait, supporting types that can be nested (i.e., add additional functionality on |
| /// top of an inner comparator) |
| </span><span class="kw">pub trait </span>Cmp { |
| <span class="doccomment">/// Compare to byte strings, bytewise. |
| </span><span class="kw">fn </span>cmp(<span class="kw-2">&</span><span class="self">self</span>, a: <span class="kw-2">&</span>[u8], b: <span class="kw-2">&</span>[u8]) -> Ordering; |
| |
| <span class="doccomment">/// Return the shortest byte string that compares "Greater" to the first argument and "Less" to |
| /// the second one. |
| </span><span class="kw">fn </span>find_shortest_sep(<span class="kw-2">&</span><span class="self">self</span>, from: <span class="kw-2">&</span>[u8], to: <span class="kw-2">&</span>[u8]) -> Vec<u8>; |
| <span class="doccomment">/// Return the shortest byte string that compares "Greater" to the argument. |
| </span><span class="kw">fn </span>find_short_succ(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span>[u8]) -> Vec<u8>; |
| |
| <span class="doccomment">/// A unique identifier for a comparator. A comparator wrapper (like InternalKeyCmp) may |
| /// return the id of its inner comparator. |
| </span><span class="kw">fn </span>id(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="lifetime">'static </span>str; |
| } |
| |
| <span class="doccomment">/// The default byte-wise comparator. |
| </span><span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>DefaultCmp; |
| |
| <span class="kw">impl </span>Cmp <span class="kw">for </span>DefaultCmp { |
| <span class="kw">fn </span>cmp(<span class="kw-2">&</span><span class="self">self</span>, a: <span class="kw-2">&</span>[u8], b: <span class="kw-2">&</span>[u8]) -> Ordering { |
| a.cmp(b) |
| } |
| |
| <span class="kw">fn </span>id(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="lifetime">'static </span>str { |
| <span class="string">"leveldb.BytewiseComparator" |
| </span>} |
| |
| <span class="kw">fn </span>find_shortest_sep(<span class="kw-2">&</span><span class="self">self</span>, a: <span class="kw-2">&</span>[u8], b: <span class="kw-2">&</span>[u8]) -> Vec<u8> { |
| <span class="kw">if </span>a == b { |
| <span class="kw">return </span>a.to_vec(); |
| } |
| |
| <span class="kw">let </span>min = <span class="kw">if </span>a.len() < b.len() { a.len() } <span class="kw">else </span>{ b.len() }; |
| <span class="kw">let </span><span class="kw-2">mut </span>diff_at = <span class="number">0</span>; |
| |
| <span class="kw">while </span>diff_at < min && a[diff_at] == b[diff_at] { |
| diff_at += <span class="number">1</span>; |
| } |
| |
| <span class="comment">// First, try to find a short separator. If that fails, try a backup mechanism below. |
| </span><span class="kw">while </span>diff_at < min { |
| <span class="kw">let </span>diff = a[diff_at]; |
| <span class="kw">if </span>diff < <span class="number">0xff </span>&& diff + <span class="number">1 </span>< b[diff_at] { |
| <span class="kw">let </span><span class="kw-2">mut </span>sep = Vec::from(<span class="kw-2">&</span>a[<span class="number">0</span>..diff_at + <span class="number">1</span>]); |
| sep[diff_at] += <span class="number">1</span>; |
| <span class="macro">assert!</span>(<span class="self">self</span>.cmp(<span class="kw-2">&</span>sep, b) == Ordering::Less); |
| <span class="kw">return </span>sep; |
| } |
| |
| diff_at += <span class="number">1</span>; |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>sep = Vec::with_capacity(a.len() + <span class="number">1</span>); |
| sep.extend_from_slice(a); |
| <span class="comment">// Try increasing a and check if it's still smaller than b. First find the last byte |
| // smaller than 0xff, and then increment that byte. Only if the separator is lesser than b, |
| // return it. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>i = a.len() - <span class="number">1</span>; |
| <span class="kw">while </span>i > <span class="number">0 </span>&& sep[i] == <span class="number">0xff </span>{ |
| i -= <span class="number">1</span>; |
| } |
| <span class="kw">if </span>sep[i] < <span class="number">0xff </span>{ |
| sep[i] += <span class="number">1</span>; |
| <span class="kw">if </span><span class="self">self</span>.cmp(<span class="kw-2">&</span>sep, b) == Ordering::Less { |
| <span class="kw">return </span>sep; |
| } <span class="kw">else </span>{ |
| sep[i] -= <span class="number">1</span>; |
| } |
| } |
| |
| <span class="comment">// Backup case: either `a` is full of 0xff, or all different places are less than 2 |
| // characters apart. |
| // The result is not necessarily short, but a good separator: e.g., "abc" vs "abd" -> |
| // "abc\0", which is greater than abc and lesser than abd. |
| // Append a 0 byte; by making it longer than a, it will compare greater to it. |
| </span>sep.extend_from_slice(<span class="kw-2">&</span>[<span class="number">0</span>]); |
| <span class="kw">return </span>sep; |
| } |
| |
| <span class="kw">fn </span>find_short_succ(<span class="kw-2">&</span><span class="self">self</span>, a: <span class="kw-2">&</span>[u8]) -> Vec<u8> { |
| <span class="kw">let </span><span class="kw-2">mut </span>result = a.to_vec(); |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..a.len() { |
| <span class="kw">if </span>a[i] != <span class="number">0xff </span>{ |
| result[i] += <span class="number">1</span>; |
| result.resize(i + <span class="number">1</span>, <span class="number">0</span>); |
| <span class="kw">return </span>result; |
| } |
| } |
| <span class="comment">// Rare path |
| </span>result.push(<span class="number">255</span>); |
| <span class="kw">return </span>result; |
| } |
| } |
| |
| <span class="doccomment">/// Same as memtable_key_cmp, but for InternalKeys. |
| </span><span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>InternalKeyCmp(<span class="kw">pub </span>Rc<Box<<span class="kw">dyn </span>Cmp>>); |
| |
| <span class="kw">impl </span>Cmp <span class="kw">for </span>InternalKeyCmp { |
| <span class="kw">fn </span>cmp(<span class="kw-2">&</span><span class="self">self</span>, a: <span class="kw-2">&</span>[u8], b: <span class="kw-2">&</span>[u8]) -> Ordering { |
| key_types::cmp_internal_key(<span class="self">self</span>.<span class="number">0</span>.as_ref().as_ref(), a, b) |
| } |
| |
| <span class="kw">fn </span>id(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="lifetime">'static </span>str { |
| <span class="self">self</span>.<span class="number">0</span>.id() |
| } |
| |
| <span class="kw">fn </span>find_shortest_sep(<span class="kw-2">&</span><span class="self">self</span>, a: <span class="kw-2">&</span>[u8], b: <span class="kw-2">&</span>[u8]) -> Vec<u8> { |
| <span class="kw">if </span>a == b { |
| <span class="kw">return </span>a.to_vec(); |
| } |
| |
| <span class="kw">let </span>(<span class="kw">_</span>, seqa, keya) = key_types::parse_internal_key(a); |
| <span class="kw">let </span>(<span class="kw">_</span>, <span class="kw">_</span>, keyb) = key_types::parse_internal_key(b); |
| |
| <span class="kw">let </span>sep: Vec<u8> = <span class="self">self</span>.<span class="number">0</span>.find_shortest_sep(keya, keyb); |
| |
| <span class="kw">if </span>sep.len() < keya.len() && <span class="self">self</span>.<span class="number">0</span>.cmp(keya, <span class="kw-2">&</span>sep) == Ordering::Less { |
| <span class="kw">return </span>LookupKey::new(<span class="kw-2">&</span>sep, types::MAX_SEQUENCE_NUMBER) |
| .internal_key() |
| .to_vec(); |
| } |
| <span class="kw">return </span>LookupKey::new(<span class="kw-2">&</span>sep, seqa).internal_key().to_vec(); |
| } |
| |
| <span class="kw">fn </span>find_short_succ(<span class="kw-2">&</span><span class="self">self</span>, a: <span class="kw-2">&</span>[u8]) -> Vec<u8> { |
| <span class="kw">let </span>(<span class="kw">_</span>, seq, key) = key_types::parse_internal_key(a); |
| <span class="kw">let </span>succ: Vec<u8> = <span class="self">self</span>.<span class="number">0</span>.find_short_succ(key); |
| <span class="kw">return </span>LookupKey::new(<span class="kw-2">&</span>succ, seq).internal_key().to_vec(); |
| } |
| } |
| |
| <span class="kw">impl </span>InternalKeyCmp { |
| <span class="doccomment">/// cmp_inner compares a and b using the underlying comparator (the "user comparator"). |
| </span><span class="kw">pub fn </span>cmp_inner(<span class="kw-2">&</span><span class="self">self</span>, a: <span class="kw-2">&</span>[u8], b: <span class="kw-2">&</span>[u8]) -> Ordering { |
| <span class="self">self</span>.<span class="number">0</span>.cmp(a, b) |
| } |
| } |
| |
| <span class="doccomment">/// An internal comparator wrapping a user-supplied comparator. This comparator is used to compare |
| /// memtable keys, which contain length prefixes and a sequence number. |
| /// The ordering is determined by asking the wrapped comparator; ties are broken by *reverse* |
| /// ordering the sequence numbers. (This means that when having an entry abx/4 and seRching for |
| /// abx/5, then abx/4 is counted as "greater-or-equal", making snapshot functionality work at all) |
| </span><span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>MemtableKeyCmp(<span class="kw">pub </span>Rc<Box<<span class="kw">dyn </span>Cmp>>); |
| |
| <span class="kw">impl </span>Cmp <span class="kw">for </span>MemtableKeyCmp { |
| <span class="kw">fn </span>cmp(<span class="kw-2">&</span><span class="self">self</span>, a: <span class="kw-2">&</span>[u8], b: <span class="kw-2">&</span>[u8]) -> Ordering { |
| key_types::cmp_memtable_key(<span class="self">self</span>.<span class="number">0</span>.as_ref().as_ref(), a, b) |
| } |
| |
| <span class="kw">fn </span>id(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="lifetime">'static </span>str { |
| <span class="self">self</span>.<span class="number">0</span>.id() |
| } |
| |
| <span class="comment">// The following two impls should not be used (by principle) although they should be correct. |
| // They will crash the program. |
| </span><span class="kw">fn </span>find_shortest_sep(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&</span>[u8], <span class="kw">_</span>: <span class="kw-2">&</span>[u8]) -> Vec<u8> { |
| <span class="macro">panic!</span>(<span class="string">"find* functions are invalid on MemtableKeyCmp"</span>); |
| } |
| |
| <span class="kw">fn </span>find_short_succ(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&</span>[u8]) -> Vec<u8> { |
| <span class="macro">panic!</span>(<span class="string">"find* functions are invalid on MemtableKeyCmp"</span>); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"enclave_unit_test"</span>)] |
| </span><span class="kw">pub mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::key_types::LookupKey; |
| <span class="kw">use </span><span class="kw">crate</span>::types; |
| <span class="kw">use </span>teaclave_test_utils::<span class="kw-2">*</span>; |
| |
| <span class="kw">pub fn </span>run_tests() -> bool { |
| <span class="macro">should_panic!</span>(test_cmp_memtablekeycmp_panics()); |
| <span class="macro">run_tests!</span>( |
| test_cmp_defaultcmp_shortest_sep, |
| test_cmp_defaultcmp_short_succ, |
| test_cmp_internalkeycmp_shortest_sep, |
| test_cmp_internalkeycmp, |
| ) |
| } |
| |
| <span class="kw">fn </span>test_cmp_defaultcmp_shortest_sep() { |
| <span class="macro">assert_eq!</span>( |
| DefaultCmp.find_shortest_sep(<span class="string">"abcd"</span>.as_bytes(), <span class="string">"abcf"</span>.as_bytes()), |
| <span class="string">"abce"</span>.as_bytes() |
| ); |
| <span class="macro">assert_eq!</span>( |
| DefaultCmp.find_shortest_sep(<span class="string">"abc"</span>.as_bytes(), <span class="string">"acd"</span>.as_bytes()), |
| <span class="string">"abd"</span>.as_bytes() |
| ); |
| <span class="macro">assert_eq!</span>( |
| DefaultCmp.find_shortest_sep(<span class="string">"abcdefghi"</span>.as_bytes(), <span class="string">"abcffghi"</span>.as_bytes()), |
| <span class="string">"abce"</span>.as_bytes() |
| ); |
| <span class="macro">assert_eq!</span>( |
| DefaultCmp.find_shortest_sep(<span class="string">"a"</span>.as_bytes(), <span class="string">"a"</span>.as_bytes()), |
| <span class="string">"a"</span>.as_bytes() |
| ); |
| <span class="macro">assert_eq!</span>( |
| DefaultCmp.find_shortest_sep(<span class="string">"a"</span>.as_bytes(), <span class="string">"b"</span>.as_bytes()), |
| <span class="string">"a\0"</span>.as_bytes() |
| ); |
| <span class="macro">assert_eq!</span>( |
| DefaultCmp.find_shortest_sep(<span class="string">"abc"</span>.as_bytes(), <span class="string">"zzz"</span>.as_bytes()), |
| <span class="string">"b"</span>.as_bytes() |
| ); |
| <span class="macro">assert_eq!</span>( |
| DefaultCmp.find_shortest_sep(<span class="string">"yyy"</span>.as_bytes(), <span class="string">"z"</span>.as_bytes()), |
| <span class="string">"yyz"</span>.as_bytes() |
| ); |
| <span class="macro">assert_eq!</span>( |
| DefaultCmp.find_shortest_sep(<span class="string">""</span>.as_bytes(), <span class="string">""</span>.as_bytes()), |
| <span class="string">""</span>.as_bytes() |
| ); |
| } |
| |
| <span class="kw">fn </span>test_cmp_defaultcmp_short_succ() { |
| <span class="macro">assert_eq!</span>( |
| DefaultCmp.find_short_succ(<span class="string">"abcd"</span>.as_bytes()), |
| <span class="string">"b"</span>.as_bytes() |
| ); |
| <span class="macro">assert_eq!</span>( |
| DefaultCmp.find_short_succ(<span class="string">"zzzz"</span>.as_bytes()), |
| <span class="string">"{"</span>.as_bytes() |
| ); |
| <span class="macro">assert_eq!</span>(DefaultCmp.find_short_succ(<span class="kw-2">&</span>[]), <span class="kw-2">&</span>[<span class="number">0xff</span>]); |
| <span class="macro">assert_eq!</span>( |
| DefaultCmp.find_short_succ(<span class="kw-2">&</span>[<span class="number">0xff</span>, <span class="number">0xff</span>, <span class="number">0xff</span>]), |
| <span class="kw-2">&</span>[<span class="number">0xff</span>, <span class="number">0xff</span>, <span class="number">0xff</span>, <span class="number">0xff</span>] |
| ); |
| } |
| |
| <span class="kw">fn </span>test_cmp_internalkeycmp_shortest_sep() { |
| <span class="kw">let </span>cmp = InternalKeyCmp(Rc::new(Box::new(DefaultCmp))); |
| <span class="macro">assert_eq!</span>( |
| cmp.find_shortest_sep( |
| LookupKey::new(<span class="string">"abcd"</span>.as_bytes(), <span class="number">1</span>).internal_key(), |
| LookupKey::new(<span class="string">"abcf"</span>.as_bytes(), <span class="number">2</span>).internal_key() |
| ), |
| LookupKey::new(<span class="string">"abce"</span>.as_bytes(), <span class="number">1</span>).internal_key() |
| ); |
| <span class="macro">assert_eq!</span>( |
| cmp.find_shortest_sep( |
| LookupKey::new(<span class="string">"abcd"</span>.as_bytes(), <span class="number">1</span>).internal_key(), |
| LookupKey::new(<span class="string">"abce"</span>.as_bytes(), <span class="number">2</span>).internal_key() |
| ), |
| LookupKey::new(<span class="string">"abcd\0"</span>.as_bytes(), <span class="number">1</span>).internal_key() |
| ); |
| <span class="macro">assert_eq!</span>( |
| cmp.find_shortest_sep( |
| LookupKey::new(<span class="string">"abc"</span>.as_bytes(), <span class="number">1</span>).internal_key(), |
| LookupKey::new(<span class="string">"zzz"</span>.as_bytes(), <span class="number">2</span>).internal_key() |
| ), |
| LookupKey::new(<span class="string">"b"</span>.as_bytes(), types::MAX_SEQUENCE_NUMBER).internal_key() |
| ); |
| <span class="macro">assert_eq!</span>( |
| cmp.find_shortest_sep( |
| LookupKey::new(<span class="string">"abc"</span>.as_bytes(), <span class="number">1</span>).internal_key(), |
| LookupKey::new(<span class="string">"acd"</span>.as_bytes(), <span class="number">2</span>).internal_key() |
| ), |
| LookupKey::new(<span class="string">"abd"</span>.as_bytes(), <span class="number">1</span>).internal_key() |
| ); |
| <span class="macro">assert_eq!</span>( |
| cmp.find_shortest_sep( |
| LookupKey::new(<span class="string">"abc"</span>.as_bytes(), <span class="number">1</span>).internal_key(), |
| LookupKey::new(<span class="string">"abe"</span>.as_bytes(), <span class="number">2</span>).internal_key() |
| ), |
| LookupKey::new(<span class="string">"abd"</span>.as_bytes(), <span class="number">1</span>).internal_key() |
| ); |
| <span class="macro">assert_eq!</span>( |
| cmp.find_shortest_sep( |
| LookupKey::new(<span class="string">""</span>.as_bytes(), <span class="number">1</span>).internal_key(), |
| LookupKey::new(<span class="string">""</span>.as_bytes(), <span class="number">2</span>).internal_key() |
| ), |
| LookupKey::new(<span class="string">""</span>.as_bytes(), <span class="number">1</span>).internal_key() |
| ); |
| <span class="macro">assert_eq!</span>( |
| cmp.find_shortest_sep( |
| LookupKey::new(<span class="string">"abc"</span>.as_bytes(), <span class="number">2</span>).internal_key(), |
| LookupKey::new(<span class="string">"abc"</span>.as_bytes(), <span class="number">2</span>).internal_key() |
| ), |
| LookupKey::new(<span class="string">"abc"</span>.as_bytes(), <span class="number">2</span>).internal_key() |
| ); |
| } |
| |
| <span class="kw">fn </span>test_cmp_internalkeycmp() { |
| <span class="kw">let </span>cmp = InternalKeyCmp(Rc::new(Box::new(DefaultCmp))); |
| <span class="comment">// a < b < c |
| </span><span class="kw">let </span>a = LookupKey::new(<span class="string">"abc"</span>.as_bytes(), <span class="number">2</span>).internal_key().to_vec(); |
| <span class="kw">let </span>b = LookupKey::new(<span class="string">"abc"</span>.as_bytes(), <span class="number">1</span>).internal_key().to_vec(); |
| <span class="kw">let </span>c = LookupKey::new(<span class="string">"abd"</span>.as_bytes(), <span class="number">3</span>).internal_key().to_vec(); |
| <span class="kw">let </span>d = <span class="string">"xyy"</span>.as_bytes(); |
| <span class="kw">let </span>e = <span class="string">"xyz"</span>.as_bytes(); |
| |
| <span class="macro">assert_eq!</span>(Ordering::Less, cmp.cmp(<span class="kw-2">&</span>a, <span class="kw-2">&</span>b)); |
| <span class="macro">assert_eq!</span>(Ordering::Equal, cmp.cmp(<span class="kw-2">&</span>a, <span class="kw-2">&</span>a)); |
| <span class="macro">assert_eq!</span>(Ordering::Greater, cmp.cmp(<span class="kw-2">&</span>b, <span class="kw-2">&</span>a)); |
| <span class="macro">assert_eq!</span>(Ordering::Less, cmp.cmp(<span class="kw-2">&</span>a, <span class="kw-2">&</span>c)); |
| <span class="macro">assert_eq!</span>(Ordering::Less, cmp.cmp_inner(d, e)); |
| <span class="macro">assert_eq!</span>(Ordering::Greater, cmp.cmp_inner(e, d)); |
| } |
| |
| <span class="kw">fn </span>test_cmp_memtablekeycmp_panics() { |
| <span class="kw">let </span>cmp = MemtableKeyCmp(Rc::new(Box::new(DefaultCmp))); |
| cmp.cmp(<span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>], <span class="kw-2">&</span>[<span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>]); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="rusty_leveldb" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
