<!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 to the Rust file `/home/dimitris/.cargo/registry/src/github.com-1ecc6299db9ec823/base64-0.5.0/src/lib.rs`.">
<meta name="keywords" content="rust, rustlang, rust-lang">
<title>lib.rs.html -- source</title>
<link rel="stylesheet" type="text/css" href="../../normalize.css">
<link rel="stylesheet" type="text/css" href="../../rustdoc.css">
<link rel="stylesheet" type="text/css" href="../../main.css">
</head>
<body class="rustdoc">
<!--[if lte IE 8]>
<div class="warning">
This old browser is unsupported and will most likely display funky
things.
</div>
<![endif]-->
<nav class="sidebar">
</nav>
<nav class="sub">
<form class="search-form js-only">
<div class="search-container">
<input class="search-input" name="search"
autocomplete="off"
placeholder="Click or press ‘S’ to search, ‘?’ for more options…"
type="search">
</div>
</form>
</nav>
<section id='main' class="content source"><pre class="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>
<span id="324">324</span>
<span id="325">325</span>
<span id="326">326</span>
<span id="327">327</span>
<span id="328">328</span>
<span id="329">329</span>
<span id="330">330</span>
<span id="331">331</span>
<span id="332">332</span>
<span id="333">333</span>
<span id="334">334</span>
<span id="335">335</span>
<span id="336">336</span>
<span id="337">337</span>
<span id="338">338</span>
<span id="339">339</span>
<span id="340">340</span>
<span id="341">341</span>
<span id="342">342</span>
<span id="343">343</span>
<span id="344">344</span>
<span id="345">345</span>
<span id="346">346</span>
<span id="347">347</span>
<span id="348">348</span>
<span id="349">349</span>
<span id="350">350</span>
<span id="351">351</span>
<span id="352">352</span>
<span id="353">353</span>
<span id="354">354</span>
<span id="355">355</span>
<span id="356">356</span>
<span id="357">357</span>
<span id="358">358</span>
<span id="359">359</span>
<span id="360">360</span>
<span id="361">361</span>
<span id="362">362</span>
<span id="363">363</span>
<span id="364">364</span>
<span id="365">365</span>
<span id="366">366</span>
<span id="367">367</span>
<span id="368">368</span>
<span id="369">369</span>
<span id="370">370</span>
<span id="371">371</span>
<span id="372">372</span>
<span id="373">373</span>
<span id="374">374</span>
<span id="375">375</span>
<span id="376">376</span>
<span id="377">377</span>
<span id="378">378</span>
<span id="379">379</span>
<span id="380">380</span>
<span id="381">381</span>
<span id="382">382</span>
<span id="383">383</span>
<span id="384">384</span>
<span id="385">385</span>
<span id="386">386</span>
<span id="387">387</span>
<span id="388">388</span>
<span id="389">389</span>
<span id="390">390</span>
<span id="391">391</span>
<span id="392">392</span>
<span id="393">393</span>
<span id="394">394</span>
<span id="395">395</span>
<span id="396">396</span>
<span id="397">397</span>
<span id="398">398</span>
<span id="399">399</span>
<span id="400">400</span>
<span id="401">401</span>
<span id="402">402</span>
<span id="403">403</span>
<span id="404">404</span>
<span id="405">405</span>
<span id="406">406</span>
<span id="407">407</span>
<span id="408">408</span>
<span id="409">409</span>
<span id="410">410</span>
<span id="411">411</span>
<span id="412">412</span>
<span id="413">413</span>
<span id="414">414</span>
<span id="415">415</span>
<span id="416">416</span>
<span id="417">417</span>
<span id="418">418</span>
<span id="419">419</span>
<span id="420">420</span>
<span id="421">421</span>
<span id="422">422</span>
<span id="423">423</span>
<span id="424">424</span>
<span id="425">425</span>
<span id="426">426</span>
<span id="427">427</span>
<span id="428">428</span>
<span id="429">429</span>
<span id="430">430</span>
<span id="431">431</span>
<span id="432">432</span>
<span id="433">433</span>
<span id="434">434</span>
<span id="435">435</span>
<span id="436">436</span>
<span id="437">437</span>
<span id="438">438</span>
<span id="439">439</span>
<span id="440">440</span>
<span id="441">441</span>
<span id="442">442</span>
<span id="443">443</span>
<span id="444">444</span>
<span id="445">445</span>
<span id="446">446</span>
<span id="447">447</span>
<span id="448">448</span>
<span id="449">449</span>
<span id="450">450</span>
<span id="451">451</span>
<span id="452">452</span>
<span id="453">453</span>
<span id="454">454</span>
<span id="455">455</span>
<span id="456">456</span>
<span id="457">457</span>
<span id="458">458</span>
<span id="459">459</span>
<span id="460">460</span>
<span id="461">461</span>
<span id="462">462</span>
<span id="463">463</span>
<span id="464">464</span>
<span id="465">465</span>
<span id="466">466</span>
<span id="467">467</span>
<span id="468">468</span>
<span id="469">469</span>
<span id="470">470</span>
<span id="471">471</span>
<span id="472">472</span>
<span id="473">473</span>
<span id="474">474</span>
<span id="475">475</span>
<span id="476">476</span>
<span id="477">477</span>
<span id="478">478</span>
<span id="479">479</span>
<span id="480">480</span>
<span id="481">481</span>
<span id="482">482</span>
<span id="483">483</span>
<span id="484">484</span>
<span id="485">485</span>
<span id="486">486</span>
<span id="487">487</span>
<span id="488">488</span>
<span id="489">489</span>
<span id="490">490</span>
<span id="491">491</span>
<span id="492">492</span>
<span id="493">493</span>
<span id="494">494</span>
<span id="495">495</span>
<span id="496">496</span>
<span id="497">497</span>
<span id="498">498</span>
<span id="499">499</span>
<span id="500">500</span>
<span id="501">501</span>
<span id="502">502</span>
<span id="503">503</span>
<span id="504">504</span>
<span id="505">505</span>
<span id="506">506</span>
<span id="507">507</span>
<span id="508">508</span>
<span id="509">509</span>
<span id="510">510</span>
<span id="511">511</span>
<span id="512">512</span>
<span id="513">513</span>
<span id="514">514</span>
<span id="515">515</span>
<span id="516">516</span>
<span id="517">517</span>
<span id="518">518</span>
<span id="519">519</span>
<span id="520">520</span>
<span id="521">521</span>
<span id="522">522</span>
<span id="523">523</span>
<span id="524">524</span>
<span id="525">525</span>
<span id="526">526</span>
<span id="527">527</span>
<span id="528">528</span>
<span id="529">529</span>
<span id="530">530</span>
<span id="531">531</span>
<span id="532">532</span>
<span id="533">533</span>
<span id="534">534</span>
<span id="535">535</span>
<span id="536">536</span>
<span id="537">537</span>
<span id="538">538</span>
<span id="539">539</span>
<span id="540">540</span>
<span id="541">541</span>
<span id="542">542</span>
<span id="543">543</span>
<span id="544">544</span>
<span id="545">545</span>
<span id="546">546</span>
<span id="547">547</span>
<span id="548">548</span>
<span id="549">549</span>
<span id="550">550</span>
<span id="551">551</span>
<span id="552">552</span>
<span id="553">553</span>
<span id="554">554</span>
<span id="555">555</span>
<span id="556">556</span>
<span id="557">557</span>
<span id="558">558</span>
<span id="559">559</span>
<span id="560">560</span>
<span id="561">561</span>
<span id="562">562</span>
<span id="563">563</span>
<span id="564">564</span>
<span id="565">565</span>
<span id="566">566</span>
<span id="567">567</span>
<span id="568">568</span>
<span id="569">569</span>
<span id="570">570</span>
<span id="571">571</span>
<span id="572">572</span>
<span id="573">573</span>
<span id="574">574</span>
<span id="575">575</span>
<span id="576">576</span>
<span id="577">577</span>
<span id="578">578</span>
<span id="579">579</span>
<span id="580">580</span>
<span id="581">581</span>
<span id="582">582</span>
<span id="583">583</span>
<span id="584">584</span>
<span id="585">585</span>
<span id="586">586</span>
<span id="587">587</span>
<span id="588">588</span>
<span id="589">589</span>
<span id="590">590</span>
<span id="591">591</span>
<span id="592">592</span>
<span id="593">593</span>
<span id="594">594</span>
<span id="595">595</span>
<span id="596">596</span>
<span id="597">597</span>
<span id="598">598</span>
<span id="599">599</span>
<span id="600">600</span>
<span id="601">601</span>
<span id="602">602</span>
<span id="603">603</span>
<span id="604">604</span>
<span id="605">605</span>
<span id="606">606</span>
<span id="607">607</span>
<span id="608">608</span>
<span id="609">609</span>
<span id="610">610</span>
<span id="611">611</span>
<span id="612">612</span>
<span id="613">613</span>
<span id="614">614</span>
<span id="615">615</span>
<span id="616">616</span>
<span id="617">617</span>
<span id="618">618</span>
<span id="619">619</span>
<span id="620">620</span>
<span id="621">621</span>
<span id="622">622</span>
<span id="623">623</span>
<span id="624">624</span>
<span id="625">625</span>
<span id="626">626</span>
<span id="627">627</span>
<span id="628">628</span>
<span id="629">629</span>
<span id="630">630</span>
<span id="631">631</span>
<span id="632">632</span>
<span id="633">633</span>
<span id="634">634</span>
<span id="635">635</span>
<span id="636">636</span>
<span id="637">637</span>
<span id="638">638</span>
<span id="639">639</span>
<span id="640">640</span>
<span id="641">641</span>
<span id="642">642</span>
<span id="643">643</span>
<span id="644">644</span>
<span id="645">645</span>
<span id="646">646</span>
<span id="647">647</span>
<span id="648">648</span>
<span id="649">649</span>
<span id="650">650</span>
<span id="651">651</span>
<span id="652">652</span>
<span id="653">653</span>
<span id="654">654</span>
<span id="655">655</span>
<span id="656">656</span>
<span id="657">657</span>
<span id="658">658</span>
</pre><pre class='rust '>
<span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>byteorder</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::{<span class='ident'>fmt</span>, <span class='ident'>error</span>, <span class='ident'>str</span>};
<span class='kw'>use</span> <span class='ident'>byteorder</span>::{<span class='ident'>BigEndian</span>, <span class='ident'>ByteOrder</span>};
<span class='kw'>mod</span> <span class='ident'>tables</span>;
<span class='doccomment'>/// Available encoding character sets</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Copy</span>, <span class='ident'>Debug</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>CharacterSet</span> {
<span class='doccomment'>/// The standard character set (uses `+` and `/`)</span>
<span class='ident'>Standard</span>,
<span class='doccomment'>/// The URL safe character set (uses `-` and `_`)</span>
<span class='ident'>UrlSafe</span>
}
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Copy</span>, <span class='ident'>Debug</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>LineEnding</span> {
<span class='ident'>LF</span>,
<span class='ident'>CRLF</span>,
}
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Copy</span>, <span class='ident'>Debug</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>LineWrap</span> {
<span class='ident'>NoWrap</span>,
<span class='ident'>Wrap</span>(<span class='ident'>usize</span>, <span class='ident'>LineEnding</span>)
}
<span class='doccomment'>/// Contains configuration parameters for base64 encoding</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Copy</span>, <span class='ident'>Debug</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Config</span> {
<span class='doccomment'>/// Character set to use</span>
<span class='ident'>char_set</span>: <span class='ident'>CharacterSet</span>,
<span class='doccomment'>/// True to pad output with `=` characters</span>
<span class='ident'>pad</span>: <span class='ident'>bool</span>,
<span class='doccomment'>/// Remove whitespace before decoding, at the cost of an allocation</span>
<span class='ident'>strip_whitespace</span>: <span class='ident'>bool</span>,
<span class='doccomment'>/// ADT signifying whether to linewrap output, and if so by how many characters and with what ending</span>
<span class='ident'>line_wrap</span>: <span class='ident'>LineWrap</span>,
}
<span class='kw'>impl</span> <span class='ident'>Config</span> {
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>char_set</span>: <span class='ident'>CharacterSet</span>,
<span class='ident'>pad</span>: <span class='ident'>bool</span>,
<span class='ident'>strip_whitespace</span>: <span class='ident'>bool</span>,
<span class='ident'>input_line_wrap</span>: <span class='ident'>LineWrap</span>) <span class='op'>-></span> <span class='ident'>Config</span> {
<span class='kw'>let</span> <span class='ident'>line_wrap</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='ident'>input_line_wrap</span> {
<span class='ident'>LineWrap</span>::<span class='ident'>Wrap</span>(<span class='number'>0</span>, _) <span class='op'>=></span> <span class='ident'>LineWrap</span>::<span class='ident'>NoWrap</span>,
_ <span class='op'>=></span> <span class='ident'>input_line_wrap</span>,
};
<span class='ident'>Config</span> {
<span class='ident'>char_set</span>: <span class='ident'>char_set</span>,
<span class='ident'>pad</span>: <span class='ident'>pad</span>,
<span class='ident'>strip_whitespace</span>: <span class='ident'>strip_whitespace</span>,
<span class='ident'>line_wrap</span>: <span class='ident'>line_wrap</span>,
}
}
}
<span class='kw'>pub</span> <span class='kw'>static</span> <span class='ident'>STANDARD</span>: <span class='ident'>Config</span> <span class='op'>=</span> <span class='ident'>Config</span> {
<span class='ident'>char_set</span>: <span class='ident'>CharacterSet</span>::<span class='ident'>Standard</span>,
<span class='ident'>pad</span>: <span class='bool-val'>true</span>,
<span class='ident'>strip_whitespace</span>: <span class='bool-val'>false</span>,
<span class='ident'>line_wrap</span>: <span class='ident'>LineWrap</span>::<span class='ident'>NoWrap</span>,
};
<span class='kw'>pub</span> <span class='kw'>static</span> <span class='ident'>MIME</span>: <span class='ident'>Config</span> <span class='op'>=</span> <span class='ident'>Config</span> {
<span class='ident'>char_set</span>: <span class='ident'>CharacterSet</span>::<span class='ident'>Standard</span>,
<span class='ident'>pad</span>: <span class='bool-val'>true</span>,
<span class='ident'>strip_whitespace</span>: <span class='bool-val'>true</span>,
<span class='ident'>line_wrap</span>: <span class='ident'>LineWrap</span>::<span class='ident'>Wrap</span>(<span class='number'>76</span>, <span class='ident'>LineEnding</span>::<span class='ident'>CRLF</span>),
};
<span class='kw'>pub</span> <span class='kw'>static</span> <span class='ident'>URL_SAFE</span>: <span class='ident'>Config</span> <span class='op'>=</span> <span class='ident'>Config</span> {
<span class='ident'>char_set</span>: <span class='ident'>CharacterSet</span>::<span class='ident'>UrlSafe</span>,
<span class='ident'>pad</span>: <span class='bool-val'>true</span>,
<span class='ident'>strip_whitespace</span>: <span class='bool-val'>false</span>,
<span class='ident'>line_wrap</span>: <span class='ident'>LineWrap</span>::<span class='ident'>NoWrap</span>,
};
<span class='kw'>pub</span> <span class='kw'>static</span> <span class='ident'>URL_SAFE_NO_PAD</span>: <span class='ident'>Config</span> <span class='op'>=</span> <span class='ident'>Config</span> {
<span class='ident'>char_set</span>: <span class='ident'>CharacterSet</span>::<span class='ident'>UrlSafe</span>,
<span class='ident'>pad</span>: <span class='bool-val'>false</span>,
<span class='ident'>strip_whitespace</span>: <span class='bool-val'>false</span>,
<span class='ident'>line_wrap</span>: <span class='ident'>LineWrap</span>::<span class='ident'>NoWrap</span>,
};
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>, <span class='ident'>Eq</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>DecodeError</span> {
<span class='ident'>InvalidByte</span>(<span class='ident'>usize</span>, <span class='ident'>u8</span>),
<span class='ident'>InvalidLength</span>,
}
<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>DecodeError</span> {
<span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-></span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
<span class='kw'>match</span> <span class='kw-2'>*</span><span class='self'>self</span> {
<span class='ident'>DecodeError</span>::<span class='ident'>InvalidByte</span>(<span class='ident'>index</span>, <span class='ident'>byte</span>) <span class='op'>=></span>
<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Invalid byte {}, offset {}."</span>, <span class='ident'>byte</span>, <span class='ident'>index</span>),
<span class='ident'>DecodeError</span>::<span class='ident'>InvalidLength</span> <span class='op'>=></span>
<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Encoded text cannot have a 6-bit remainder."</span>)
}
}
}
<span class='kw'>impl</span> <span class='ident'>error</span>::<span class='ident'>Error</span> <span class='kw'>for</span> <span class='ident'>DecodeError</span> {
<span class='kw'>fn</span> <span class='ident'>description</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='kw-2'>&</span><span class='ident'>str</span> {
<span class='kw'>match</span> <span class='kw-2'>*</span><span class='self'>self</span> {
<span class='ident'>DecodeError</span>::<span class='ident'>InvalidByte</span>(_, _) <span class='op'>=></span> <span class='string'>"invalid byte"</span>,
<span class='ident'>DecodeError</span>::<span class='ident'>InvalidLength</span> <span class='op'>=></span> <span class='string'>"invalid length"</span>
}
}
<span class='kw'>fn</span> <span class='ident'>cause</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>error</span>::<span class='ident'>Error</span><span class='op'>></span> {
<span class='prelude-val'>None</span>
}
}
<span class='doccomment'>///Encode arbitrary octets as base64.</span>
<span class='doccomment'>///Returns a String.</span>
<span class='doccomment'>///Convenience for `encode_config(input, base64::STANDARD);`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>///# Example</span>
<span class='doccomment'>///</span>
<span class='doccomment'>///```rust</span>
<span class='doccomment'>///extern crate base64;</span>
<span class='doccomment'>///</span>
<span class='doccomment'>///fn main() {</span>
<span class='doccomment'>/// let b64 = base64::encode(b"hello world");</span>
<span class='doccomment'>/// println!("{}", b64);</span>
<span class='doccomment'>///}</span>
<span class='doccomment'>///```</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>encode</span><span class='op'><</span><span class='ident'>T</span>: <span class='question-mark'>?</span><span class='ident'>Sized</span> <span class='op'>+</span> <span class='ident'>AsRef</span><span class='op'><</span>[<span class='ident'>u8</span>]<span class='op'>>></span>(<span class='ident'>input</span>: <span class='kw-2'>&</span><span class='ident'>T</span>) <span class='op'>-></span> <span class='ident'>String</span> {
<span class='ident'>encode_config</span>(<span class='ident'>input</span>, <span class='ident'>STANDARD</span>)
}
<span class='doccomment'>///Decode from string reference as octets.</span>
<span class='doccomment'>///Returns a Result containing a Vec<u8>.</span>
<span class='doccomment'>///Convenience `decode_config(input, base64::STANDARD);`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>///# Example</span>
<span class='doccomment'>///</span>
<span class='doccomment'>///```rust</span>
<span class='doccomment'>///extern crate base64;</span>
<span class='doccomment'>///</span>
<span class='doccomment'>///fn main() {</span>
<span class='doccomment'>/// let bytes = base64::decode("aGVsbG8gd29ybGQ=").unwrap();</span>
<span class='doccomment'>/// println!("{:?}", bytes);</span>
<span class='doccomment'>///}</span>
<span class='doccomment'>///```</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>decode</span><span class='op'><</span><span class='ident'>T</span>: <span class='question-mark'>?</span><span class='ident'>Sized</span> <span class='op'>+</span> <span class='ident'>AsRef</span><span class='op'><</span>[<span class='ident'>u8</span>]<span class='op'>>></span>(<span class='ident'>input</span>: <span class='kw-2'>&</span><span class='ident'>T</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>Vec</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>></span>, <span class='ident'>DecodeError</span><span class='op'>></span> {
<span class='ident'>decode_config</span>(<span class='ident'>input</span>, <span class='ident'>STANDARD</span>)
}
<span class='doccomment'>///Encode arbitrary octets as base64.</span>
<span class='doccomment'>///Returns a String.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>///# Example</span>
<span class='doccomment'>///</span>
<span class='doccomment'>///```rust</span>
<span class='doccomment'>///extern crate base64;</span>
<span class='doccomment'>///</span>
<span class='doccomment'>///fn main() {</span>
<span class='doccomment'>/// let b64 = base64::encode_config(b"hello world~", base64::STANDARD);</span>
<span class='doccomment'>/// println!("{}", b64);</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// let b64_url = base64::encode_config(b"hello internet~", base64::URL_SAFE);</span>
<span class='doccomment'>/// println!("{}", b64_url);</span>
<span class='doccomment'>///}</span>
<span class='doccomment'>///```</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>encode_config</span><span class='op'><</span><span class='ident'>T</span>: <span class='question-mark'>?</span><span class='ident'>Sized</span> <span class='op'>+</span> <span class='ident'>AsRef</span><span class='op'><</span>[<span class='ident'>u8</span>]<span class='op'>>></span>(<span class='ident'>input</span>: <span class='kw-2'>&</span><span class='ident'>T</span>, <span class='ident'>config</span>: <span class='ident'>Config</span>) <span class='op'>-></span> <span class='ident'>String</span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>buf</span> <span class='op'>=</span> <span class='ident'>String</span>::<span class='ident'>with_capacity</span>(<span class='ident'>encoded_size</span>(<span class='ident'>input</span>.<span class='ident'>as_ref</span>().<span class='ident'>len</span>(), <span class='ident'>config</span>));
<span class='ident'>encode_config_buf</span>(<span class='ident'>input</span>, <span class='ident'>config</span>, <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>buf</span>);
<span class='ident'>buf</span>
}
<span class='doccomment'>/// calculate the base64 encoded string size, including padding</span>
<span class='kw'>fn</span> <span class='ident'>encoded_size</span>(<span class='ident'>bytes_len</span>: <span class='ident'>usize</span>, <span class='ident'>config</span>: <span class='ident'>Config</span>) <span class='op'>-></span> <span class='ident'>usize</span> {
<span class='kw'>let</span> <span class='ident'>rem</span> <span class='op'>=</span> <span class='ident'>bytes_len</span> <span class='op'>%</span> <span class='number'>3</span>;
<span class='kw'>let</span> <span class='ident'>complete_input_chunks</span> <span class='op'>=</span> <span class='ident'>bytes_len</span> <span class='op'>/</span> <span class='number'>3</span>;
<span class='kw'>let</span> <span class='ident'>complete_output_chars</span> <span class='op'>=</span> <span class='ident'>complete_input_chunks</span> <span class='op'>*</span> <span class='number'>4</span>;
<span class='kw'>let</span> <span class='ident'>printing_output_chars</span> <span class='op'>=</span> <span class='kw'>if</span> <span class='ident'>rem</span> <span class='op'>==</span> <span class='number'>0</span> {
<span class='ident'>complete_output_chars</span>
} <span class='kw'>else</span> {
<span class='ident'>complete_output_chars</span> <span class='op'>+</span> <span class='number'>4</span>
};
<span class='kw'>let</span> <span class='ident'>line_ending_output_chars</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='ident'>config</span>.<span class='ident'>line_wrap</span> {
<span class='ident'>LineWrap</span>::<span class='ident'>NoWrap</span> <span class='op'>=></span> <span class='number'>0</span>,
<span class='ident'>LineWrap</span>::<span class='ident'>Wrap</span>(<span class='ident'>n</span>, <span class='ident'>LineEnding</span>::<span class='ident'>CRLF</span>) <span class='op'>=></span> <span class='ident'>printing_output_chars</span> <span class='op'>/</span> <span class='ident'>n</span> <span class='op'>*</span> <span class='number'>2</span>,
<span class='ident'>LineWrap</span>::<span class='ident'>Wrap</span>(<span class='ident'>n</span>, <span class='ident'>LineEnding</span>::<span class='ident'>LF</span>) <span class='op'>=></span> <span class='ident'>printing_output_chars</span> <span class='op'>/</span> <span class='ident'>n</span>,
};
<span class='kw'>return</span> <span class='ident'>printing_output_chars</span> <span class='op'>+</span> <span class='ident'>line_ending_output_chars</span>;
}
<span class='doccomment'>///Encode arbitrary octets as base64.</span>
<span class='doccomment'>///Writes into the supplied buffer to avoid allocations.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>///# Example</span>
<span class='doccomment'>///</span>
<span class='doccomment'>///```rust</span>
<span class='doccomment'>///extern crate base64;</span>
<span class='doccomment'>///</span>
<span class='doccomment'>///fn main() {</span>
<span class='doccomment'>/// let mut buf = String::new();</span>
<span class='doccomment'>/// base64::encode_config_buf(b"hello world~", base64::STANDARD, &mut buf);</span>
<span class='doccomment'>/// println!("{}", buf);</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// buf.clear();</span>
<span class='doccomment'>/// base64::encode_config_buf(b"hello internet~", base64::URL_SAFE, &mut buf);</span>
<span class='doccomment'>/// println!("{}", buf);</span>
<span class='doccomment'>///}</span>
<span class='doccomment'>///```</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>encode_config_buf</span><span class='op'><</span><span class='ident'>T</span>: <span class='question-mark'>?</span><span class='ident'>Sized</span> <span class='op'>+</span> <span class='ident'>AsRef</span><span class='op'><</span>[<span class='ident'>u8</span>]<span class='op'>>></span>(<span class='ident'>input</span>: <span class='kw-2'>&</span><span class='ident'>T</span>, <span class='ident'>config</span>: <span class='ident'>Config</span>, <span class='ident'>buf</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>String</span>) {
<span class='kw'>let</span> <span class='ident'>input_bytes</span> <span class='op'>=</span> <span class='ident'>input</span>.<span class='ident'>as_ref</span>();
<span class='kw'>let</span> <span class='kw-2'>ref</span> <span class='ident'>charset</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='ident'>config</span>.<span class='ident'>char_set</span> {
<span class='ident'>CharacterSet</span>::<span class='ident'>Standard</span> <span class='op'>=></span> <span class='ident'>tables</span>::<span class='ident'>STANDARD_ENCODE</span>,
<span class='ident'>CharacterSet</span>::<span class='ident'>UrlSafe</span> <span class='op'>=></span> <span class='ident'>tables</span>::<span class='ident'>URL_SAFE_ENCODE</span>,
};
<span class='comment'>// reserve to make sure the memory we'll be writing to with unsafe is allocated</span>
<span class='ident'>buf</span>.<span class='ident'>reserve</span>(<span class='ident'>encoded_size</span>(<span class='ident'>input_bytes</span>.<span class='ident'>len</span>(), <span class='ident'>config</span>));
<span class='kw'>let</span> <span class='ident'>orig_buf_len</span> <span class='op'>=</span> <span class='ident'>buf</span>.<span class='ident'>len</span>();
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>fast_loop_output_buf_len</span> <span class='op'>=</span> <span class='ident'>orig_buf_len</span>;
<span class='kw'>let</span> <span class='ident'>input_chunk_len</span> <span class='op'>=</span> <span class='number'>6</span>;
<span class='kw'>let</span> <span class='ident'>last_fast_index</span> <span class='op'>=</span> <span class='ident'>input_bytes</span>.<span class='ident'>len</span>().<span class='ident'>saturating_sub</span>(<span class='number'>8</span>);
<span class='comment'>// we're only going to insert valid utf8</span>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>raw</span> <span class='op'>=</span> <span class='kw'>unsafe</span> { <span class='ident'>buf</span>.<span class='ident'>as_mut_vec</span>() };
<span class='comment'>// start at the first free part of the output buf</span>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>output_ptr</span> <span class='op'>=</span> <span class='kw'>unsafe</span> { <span class='ident'>raw</span>.<span class='ident'>as_mut_ptr</span>().<span class='ident'>offset</span>(<span class='ident'>orig_buf_len</span> <span class='kw'>as</span> <span class='ident'>isize</span>) };
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>input_index</span>: <span class='ident'>usize</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='kw'>if</span> <span class='ident'>input_bytes</span>.<span class='ident'>len</span>() <span class='op'>>=</span> <span class='number'>8</span> {
<span class='kw'>while</span> <span class='ident'>input_index</span> <span class='op'><=</span> <span class='ident'>last_fast_index</span> {
<span class='kw'>let</span> <span class='ident'>input_chunk</span> <span class='op'>=</span> <span class='ident'>BigEndian</span>::<span class='ident'>read_u64</span>(<span class='kw-2'>&</span><span class='ident'>input_bytes</span>[<span class='ident'>input_index</span>..(<span class='ident'>input_index</span> <span class='op'>+</span> <span class='number'>8</span>)]);
<span class='comment'>// strip off 6 bits at a time for the first 6 bytes</span>
<span class='kw'>unsafe</span> {
<span class='ident'>std</span>::<span class='ident'>ptr</span>::<span class='ident'>write</span>(<span class='ident'>output_ptr</span>, <span class='ident'>charset</span>[((<span class='ident'>input_chunk</span> <span class='op'>>></span> <span class='number'>58</span>) <span class='op'>&</span> <span class='number'>0x3F</span>) <span class='kw'>as</span> <span class='ident'>usize</span>]);
<span class='ident'>std</span>::<span class='ident'>ptr</span>::<span class='ident'>write</span>(<span class='ident'>output_ptr</span>.<span class='ident'>offset</span>(<span class='number'>1</span>), <span class='ident'>charset</span>[((<span class='ident'>input_chunk</span> <span class='op'>>></span> <span class='number'>52</span>) <span class='op'>&</span> <span class='number'>0x3F</span>) <span class='kw'>as</span> <span class='ident'>usize</span>]);
<span class='ident'>std</span>::<span class='ident'>ptr</span>::<span class='ident'>write</span>(<span class='ident'>output_ptr</span>.<span class='ident'>offset</span>(<span class='number'>2</span>), <span class='ident'>charset</span>[((<span class='ident'>input_chunk</span> <span class='op'>>></span> <span class='number'>46</span>) <span class='op'>&</span> <span class='number'>0x3F</span>) <span class='kw'>as</span> <span class='ident'>usize</span>]);
<span class='ident'>std</span>::<span class='ident'>ptr</span>::<span class='ident'>write</span>(<span class='ident'>output_ptr</span>.<span class='ident'>offset</span>(<span class='number'>3</span>), <span class='ident'>charset</span>[((<span class='ident'>input_chunk</span> <span class='op'>>></span> <span class='number'>40</span>) <span class='op'>&</span> <span class='number'>0x3F</span>) <span class='kw'>as</span> <span class='ident'>usize</span>]);
<span class='ident'>std</span>::<span class='ident'>ptr</span>::<span class='ident'>write</span>(<span class='ident'>output_ptr</span>.<span class='ident'>offset</span>(<span class='number'>4</span>), <span class='ident'>charset</span>[((<span class='ident'>input_chunk</span> <span class='op'>>></span> <span class='number'>34</span>) <span class='op'>&</span> <span class='number'>0x3F</span>) <span class='kw'>as</span> <span class='ident'>usize</span>]);
<span class='ident'>std</span>::<span class='ident'>ptr</span>::<span class='ident'>write</span>(<span class='ident'>output_ptr</span>.<span class='ident'>offset</span>(<span class='number'>5</span>), <span class='ident'>charset</span>[((<span class='ident'>input_chunk</span> <span class='op'>>></span> <span class='number'>28</span>) <span class='op'>&</span> <span class='number'>0x3F</span>) <span class='kw'>as</span> <span class='ident'>usize</span>]);
<span class='ident'>std</span>::<span class='ident'>ptr</span>::<span class='ident'>write</span>(<span class='ident'>output_ptr</span>.<span class='ident'>offset</span>(<span class='number'>6</span>), <span class='ident'>charset</span>[((<span class='ident'>input_chunk</span> <span class='op'>>></span> <span class='number'>22</span>) <span class='op'>&</span> <span class='number'>0x3F</span>) <span class='kw'>as</span> <span class='ident'>usize</span>]);
<span class='ident'>std</span>::<span class='ident'>ptr</span>::<span class='ident'>write</span>(<span class='ident'>output_ptr</span>.<span class='ident'>offset</span>(<span class='number'>7</span>), <span class='ident'>charset</span>[((<span class='ident'>input_chunk</span> <span class='op'>>></span> <span class='number'>16</span>) <span class='op'>&</span> <span class='number'>0x3F</span>) <span class='kw'>as</span> <span class='ident'>usize</span>]);
<span class='ident'>output_ptr</span> <span class='op'>=</span> <span class='ident'>output_ptr</span>.<span class='ident'>offset</span>(<span class='number'>8</span>);
}
<span class='ident'>input_index</span> <span class='op'>+=</span> <span class='ident'>input_chunk_len</span>;
<span class='ident'>fast_loop_output_buf_len</span> <span class='op'>+=</span> <span class='number'>8</span>;
}
}
<span class='kw'>unsafe</span> {
<span class='comment'>// expand len to include the bytes we just wrote</span>
<span class='ident'>raw</span>.<span class='ident'>set_len</span>(<span class='ident'>fast_loop_output_buf_len</span>);
}
<span class='comment'>// encode the 0 to 7 bytes left after the fast loop</span>
<span class='kw'>let</span> <span class='ident'>rem</span> <span class='op'>=</span> <span class='ident'>input_bytes</span>.<span class='ident'>len</span>() <span class='op'>%</span> <span class='number'>3</span>;
<span class='kw'>let</span> <span class='ident'>start_of_rem</span> <span class='op'>=</span> <span class='ident'>input_bytes</span>.<span class='ident'>len</span>() <span class='op'>-</span> <span class='ident'>rem</span>;
<span class='comment'>// start at the first index not handled by fast loop, which may be 0.</span>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>leftover_index</span> <span class='op'>=</span> <span class='ident'>input_index</span>;
<span class='kw'>while</span> <span class='ident'>leftover_index</span> <span class='op'><</span> <span class='ident'>start_of_rem</span> {
<span class='ident'>raw</span>.<span class='ident'>push</span>(<span class='ident'>charset</span>[(<span class='ident'>input_bytes</span>[<span class='ident'>leftover_index</span>] <span class='op'>>></span> <span class='number'>2</span>) <span class='kw'>as</span> <span class='ident'>usize</span>]);
<span class='ident'>raw</span>.<span class='ident'>push</span>(<span class='ident'>charset</span>[((<span class='ident'>input_bytes</span>[<span class='ident'>leftover_index</span>] <span class='op'><<</span> <span class='number'>4</span> <span class='op'>|</span> <span class='ident'>input_bytes</span>[<span class='ident'>leftover_index</span> <span class='op'>+</span> <span class='number'>1</span>] <span class='op'>>></span> <span class='number'>4</span>) <span class='op'>&</span> <span class='number'>0x3f</span>) <span class='kw'>as</span> <span class='ident'>usize</span>]);
<span class='ident'>raw</span>.<span class='ident'>push</span>(<span class='ident'>charset</span>[((<span class='ident'>input_bytes</span>[<span class='ident'>leftover_index</span> <span class='op'>+</span> <span class='number'>1</span>] <span class='op'><<</span> <span class='number'>2</span> <span class='op'>|</span> <span class='ident'>input_bytes</span>[<span class='ident'>leftover_index</span> <span class='op'>+</span> <span class='number'>2</span>] <span class='op'>>></span> <span class='number'>6</span>) <span class='op'>&</span> <span class='number'>0x3f</span>) <span class='kw'>as</span> <span class='ident'>usize</span>]);
<span class='ident'>raw</span>.<span class='ident'>push</span>(<span class='ident'>charset</span>[(<span class='ident'>input_bytes</span>[<span class='ident'>leftover_index</span> <span class='op'>+</span> <span class='number'>2</span>] <span class='op'>&</span> <span class='number'>0x3f</span>) <span class='kw'>as</span> <span class='ident'>usize</span>]);
<span class='ident'>leftover_index</span> <span class='op'>+=</span> <span class='number'>3</span>;
}
<span class='kw'>if</span> <span class='ident'>rem</span> <span class='op'>==</span> <span class='number'>2</span> {
<span class='ident'>raw</span>.<span class='ident'>push</span>(<span class='ident'>charset</span>[(<span class='ident'>input_bytes</span>[<span class='ident'>start_of_rem</span>] <span class='op'>>></span> <span class='number'>2</span>) <span class='kw'>as</span> <span class='ident'>usize</span>]);
<span class='ident'>raw</span>.<span class='ident'>push</span>(<span class='ident'>charset</span>[((<span class='ident'>input_bytes</span>[<span class='ident'>start_of_rem</span>] <span class='op'><<</span> <span class='number'>4</span> <span class='op'>|</span> <span class='ident'>input_bytes</span>[<span class='ident'>start_of_rem</span> <span class='op'>+</span> <span class='number'>1</span>] <span class='op'>>></span> <span class='number'>4</span>) <span class='op'>&</span> <span class='number'>0x3f</span>) <span class='kw'>as</span> <span class='ident'>usize</span>]);
<span class='ident'>raw</span>.<span class='ident'>push</span>(<span class='ident'>charset</span>[(<span class='ident'>input_bytes</span>[<span class='ident'>start_of_rem</span> <span class='op'>+</span> <span class='number'>1</span>] <span class='op'><<</span> <span class='number'>2</span> <span class='op'>&</span> <span class='number'>0x3f</span>) <span class='kw'>as</span> <span class='ident'>usize</span>]);
} <span class='kw'>else</span> <span class='kw'>if</span> <span class='ident'>rem</span> <span class='op'>==</span> <span class='number'>1</span> {
<span class='ident'>raw</span>.<span class='ident'>push</span>(<span class='ident'>charset</span>[(<span class='ident'>input_bytes</span>[<span class='ident'>start_of_rem</span>] <span class='op'>>></span> <span class='number'>2</span>) <span class='kw'>as</span> <span class='ident'>usize</span>]);
<span class='ident'>raw</span>.<span class='ident'>push</span>(<span class='ident'>charset</span>[(<span class='ident'>input_bytes</span>[<span class='ident'>start_of_rem</span>] <span class='op'><<</span> <span class='number'>4</span> <span class='op'>&</span> <span class='number'>0x3f</span>) <span class='kw'>as</span> <span class='ident'>usize</span>]);
}
<span class='kw'>if</span> <span class='ident'>config</span>.<span class='ident'>pad</span> {
<span class='kw'>for</span> _ <span class='kw'>in</span> <span class='number'>0</span>..((<span class='number'>3</span> <span class='op'>-</span> <span class='ident'>rem</span>) <span class='op'>%</span> <span class='number'>3</span>) {
<span class='ident'>raw</span>.<span class='ident'>push</span>(<span class='number'>0x3d</span>);
}
}
<span class='kw'>if</span> <span class='kw'>let</span> <span class='ident'>LineWrap</span>::<span class='ident'>Wrap</span>(<span class='ident'>line_size</span>, <span class='ident'>line_end</span>) <span class='op'>=</span> <span class='ident'>config</span>.<span class='ident'>line_wrap</span> {
<span class='kw'>let</span> <span class='ident'>len</span> <span class='op'>=</span> <span class='ident'>raw</span>.<span class='ident'>len</span>();
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>i</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>j</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='kw'>while</span> <span class='ident'>i</span> <span class='op'><</span> <span class='ident'>len</span> {
<span class='kw'>if</span> <span class='ident'>i</span> <span class='op'>></span> <span class='number'>0</span> <span class='op'>&&</span> <span class='ident'>i</span> <span class='op'>%</span> <span class='ident'>line_size</span> <span class='op'>==</span> <span class='number'>0</span> {
<span class='kw'>match</span> <span class='ident'>line_end</span> {
<span class='ident'>LineEnding</span>::<span class='ident'>LF</span> <span class='op'>=></span> { <span class='ident'>raw</span>.<span class='ident'>insert</span>(<span class='ident'>j</span>, <span class='string'>b'\n'</span>); <span class='ident'>j</span> <span class='op'>+=</span> <span class='number'>1</span>; }
<span class='ident'>LineEnding</span>::<span class='ident'>CRLF</span> <span class='op'>=></span> { <span class='ident'>raw</span>.<span class='ident'>insert</span>(<span class='ident'>j</span>, <span class='string'>b'\r'</span>); <span class='ident'>raw</span>.<span class='ident'>insert</span>(<span class='ident'>j</span> <span class='op'>+</span> <span class='number'>1</span>, <span class='string'>b'\n'</span>); <span class='ident'>j</span> <span class='op'>+=</span> <span class='number'>2</span>; }
}
}
<span class='ident'>i</span> <span class='op'>+=</span> <span class='number'>1</span>;
<span class='ident'>j</span> <span class='op'>+=</span> <span class='number'>1</span>;
}
}
}
<span class='doccomment'>///Decode from string reference as octets.</span>
<span class='doccomment'>///Returns a Result containing a Vec<u8>.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>///# Example</span>
<span class='doccomment'>///</span>
<span class='doccomment'>///```rust</span>
<span class='doccomment'>///extern crate base64;</span>
<span class='doccomment'>///</span>
<span class='doccomment'>///fn main() {</span>
<span class='doccomment'>/// let bytes = base64::decode_config("aGVsbG8gd29ybGR+Cg==", base64::STANDARD).unwrap();</span>
<span class='doccomment'>/// println!("{:?}", bytes);</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// let bytes_url = base64::decode_config("aGVsbG8gaW50ZXJuZXR-Cg==", base64::URL_SAFE).unwrap();</span>
<span class='doccomment'>/// println!("{:?}", bytes_url);</span>
<span class='doccomment'>///}</span>
<span class='doccomment'>///```</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>decode_config</span><span class='op'><</span><span class='ident'>T</span>: <span class='question-mark'>?</span><span class='ident'>Sized</span> <span class='op'>+</span> <span class='ident'>AsRef</span><span class='op'><</span>[<span class='ident'>u8</span>]<span class='op'>>></span>(<span class='ident'>input</span>: <span class='kw-2'>&</span><span class='ident'>T</span>, <span class='ident'>config</span>: <span class='ident'>Config</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>Vec</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>></span>, <span class='ident'>DecodeError</span><span class='op'>></span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>buffer</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='op'><</span><span class='ident'>u8</span><span class='op'>></span>::<span class='ident'>with_capacity</span>(<span class='ident'>input</span>.<span class='ident'>as_ref</span>().<span class='ident'>len</span>() <span class='op'>*</span> <span class='number'>4</span> <span class='op'>/</span> <span class='number'>3</span>);
<span class='ident'>decode_config_buf</span>(<span class='ident'>input</span>, <span class='ident'>config</span>, <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>buffer</span>).<span class='ident'>map</span>(<span class='op'>|</span>_<span class='op'>|</span> <span class='ident'>buffer</span>)
}
<span class='doccomment'>///Decode from string reference as octets.</span>
<span class='doccomment'>///Writes into the supplied buffer to avoid allocation.</span>
<span class='doccomment'>///Returns a Result containing an empty tuple, aka ().</span>
<span class='doccomment'>///</span>
<span class='doccomment'>///# Example</span>
<span class='doccomment'>///</span>
<span class='doccomment'>///```rust</span>
<span class='doccomment'>///extern crate base64;</span>
<span class='doccomment'>///</span>
<span class='doccomment'>///fn main() {</span>
<span class='doccomment'>/// let mut buffer = Vec::<u8>::new();</span>
<span class='doccomment'>/// base64::decode_config_buf("aGVsbG8gd29ybGR+Cg==", base64::STANDARD, &mut buffer).unwrap();</span>
<span class='doccomment'>/// println!("{:?}", buffer);</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// buffer.clear();</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// base64::decode_config_buf("aGVsbG8gaW50ZXJuZXR-Cg==", base64::URL_SAFE, &mut buffer).unwrap();</span>
<span class='doccomment'>/// println!("{:?}", buffer);</span>
<span class='doccomment'>///}</span>
<span class='doccomment'>///```</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>decode_config_buf</span><span class='op'><</span><span class='ident'>T</span>: <span class='question-mark'>?</span><span class='ident'>Sized</span> <span class='op'>+</span> <span class='ident'>AsRef</span><span class='op'><</span>[<span class='ident'>u8</span>]<span class='op'>>></span>(<span class='ident'>input</span>: <span class='kw-2'>&</span><span class='ident'>T</span>,
<span class='ident'>config</span>: <span class='ident'>Config</span>,
<span class='ident'>buffer</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>></span>)
<span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span>(), <span class='ident'>DecodeError</span><span class='op'>></span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>input_copy</span>;
<span class='kw'>let</span> <span class='ident'>input_bytes</span> <span class='op'>=</span> <span class='kw'>if</span> <span class='ident'>config</span>.<span class='ident'>strip_whitespace</span> {
<span class='ident'>input_copy</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='op'><</span><span class='ident'>u8</span><span class='op'>></span>::<span class='ident'>with_capacity</span>(<span class='ident'>input</span>.<span class='ident'>as_ref</span>().<span class='ident'>len</span>());
<span class='ident'>input_copy</span>.<span class='ident'>extend</span>(<span class='ident'>input</span>.<span class='ident'>as_ref</span>().<span class='ident'>iter</span>().<span class='ident'>filter</span>(<span class='op'>|</span><span class='ident'>b</span><span class='op'>|</span> <span class='op'>!</span><span class='string'>b" \n\t\r\x0b\x0c"</span>.<span class='ident'>contains</span>(<span class='ident'>b</span>)));
<span class='ident'>input_copy</span>.<span class='ident'>as_ref</span>()
} <span class='kw'>else</span> {
<span class='ident'>input</span>.<span class='ident'>as_ref</span>()
};
<span class='kw'>let</span> <span class='kw-2'>ref</span> <span class='ident'>decode_table</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='ident'>config</span>.<span class='ident'>char_set</span> {
<span class='ident'>CharacterSet</span>::<span class='ident'>Standard</span> <span class='op'>=></span> <span class='ident'>tables</span>::<span class='ident'>STANDARD_DECODE</span>,
<span class='ident'>CharacterSet</span>::<span class='ident'>UrlSafe</span> <span class='op'>=></span> <span class='ident'>tables</span>::<span class='ident'>URL_SAFE_DECODE</span>,
};
<span class='ident'>buffer</span>.<span class='ident'>reserve</span>(<span class='ident'>input_bytes</span>.<span class='ident'>len</span>() <span class='op'>*</span> <span class='number'>3</span> <span class='op'>/</span> <span class='number'>4</span>);
<span class='comment'>// the fast loop only handles complete chunks of 8 input bytes without padding</span>
<span class='kw'>let</span> <span class='ident'>chunk_len</span> <span class='op'>=</span> <span class='number'>8</span>;
<span class='kw'>let</span> <span class='ident'>decoded_chunk_len</span> <span class='op'>=</span> <span class='number'>6</span>;
<span class='kw'>let</span> <span class='ident'>remainder_len</span> <span class='op'>=</span> <span class='ident'>input_bytes</span>.<span class='ident'>len</span>() <span class='op'>%</span> <span class='ident'>chunk_len</span>;
<span class='kw'>let</span> <span class='ident'>trailing_bytes_to_skip</span> <span class='op'>=</span> <span class='kw'>if</span> <span class='ident'>remainder_len</span> <span class='op'>==</span> <span class='number'>0</span> {
<span class='comment'>// if input is a multiple of the chunk size, ignore the last chunk as it may have padding</span>
<span class='ident'>chunk_len</span>
} <span class='kw'>else</span> {
<span class='ident'>remainder_len</span>
};
<span class='kw'>let</span> <span class='ident'>length_of_full_chunks</span> <span class='op'>=</span> <span class='ident'>input_bytes</span>.<span class='ident'>len</span>().<span class='ident'>saturating_sub</span>(<span class='ident'>trailing_bytes_to_skip</span>);
<span class='kw'>let</span> <span class='ident'>starting_output_index</span> <span class='op'>=</span> <span class='ident'>buffer</span>.<span class='ident'>len</span>();
<span class='comment'>// Resize to hold decoded output from fast loop. Need the extra two bytes because</span>
<span class='comment'>// we write a full 8 bytes for the last 6-byte decoded chunk and then truncate off two</span>
<span class='kw'>let</span> <span class='ident'>new_size</span> <span class='op'>=</span> <span class='ident'>starting_output_index</span>
<span class='op'>+</span> <span class='ident'>length_of_full_chunks</span> <span class='op'>/</span> <span class='ident'>chunk_len</span> <span class='op'>*</span> <span class='ident'>decoded_chunk_len</span>
<span class='op'>+</span> (<span class='ident'>chunk_len</span> <span class='op'>-</span> <span class='ident'>decoded_chunk_len</span>);
<span class='ident'>buffer</span>.<span class='ident'>resize</span>(<span class='ident'>new_size</span>, <span class='number'>0</span>);
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>output_index</span> <span class='op'>=</span> <span class='ident'>starting_output_index</span>;
{
<span class='kw'>let</span> <span class='ident'>buffer_slice</span> <span class='op'>=</span> <span class='ident'>buffer</span>.<span class='ident'>as_mut_slice</span>();
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>input_index</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='comment'>// initial value is never used; always set if fast loop breaks</span>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>bad_byte_index</span>: <span class='ident'>usize</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='comment'>// a non-invalid value means it's not an error if fast loop never runs</span>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>morsel</span>: <span class='ident'>u8</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='comment'>// fast loop of 8 bytes at a time</span>
<span class='kw'>while</span> <span class='ident'>input_index</span> <span class='op'><</span> <span class='ident'>length_of_full_chunks</span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>accum</span>: <span class='ident'>u64</span>;
<span class='kw'>let</span> <span class='ident'>input_chunk</span> <span class='op'>=</span> <span class='ident'>BigEndian</span>::<span class='ident'>read_u64</span>(<span class='kw-2'>&</span><span class='ident'>input_bytes</span>[<span class='ident'>input_index</span>..(<span class='ident'>input_index</span> <span class='op'>+</span> <span class='number'>8</span>)]);
<span class='ident'>morsel</span> <span class='op'>=</span> <span class='ident'>decode_table</span>[(<span class='ident'>input_chunk</span> <span class='op'>>></span> <span class='number'>56</span>) <span class='kw'>as</span> <span class='ident'>usize</span>];
<span class='kw'>if</span> <span class='ident'>morsel</span> <span class='op'>==</span> <span class='ident'>tables</span>::<span class='ident'>INVALID_VALUE</span> {
<span class='ident'>bad_byte_index</span> <span class='op'>=</span> <span class='ident'>input_index</span>;
<span class='kw'>break</span>;
};
<span class='ident'>accum</span> <span class='op'>=</span> (<span class='ident'>morsel</span> <span class='kw'>as</span> <span class='ident'>u64</span>) <span class='op'><<</span> <span class='number'>58</span>;
<span class='ident'>morsel</span> <span class='op'>=</span> <span class='ident'>decode_table</span>[(<span class='ident'>input_chunk</span> <span class='op'>>></span> <span class='number'>48</span> <span class='op'>&</span> <span class='number'>0xFF</span>) <span class='kw'>as</span> <span class='ident'>usize</span>];
<span class='kw'>if</span> <span class='ident'>morsel</span> <span class='op'>==</span> <span class='ident'>tables</span>::<span class='ident'>INVALID_VALUE</span> {
<span class='ident'>bad_byte_index</span> <span class='op'>=</span> <span class='ident'>input_index</span> <span class='op'>+</span> <span class='number'>1</span>;
<span class='kw'>break</span>;
};
<span class='ident'>accum</span> <span class='op'>|=</span> (<span class='ident'>morsel</span> <span class='kw'>as</span> <span class='ident'>u64</span>) <span class='op'><<</span> <span class='number'>52</span>;
<span class='ident'>morsel</span> <span class='op'>=</span> <span class='ident'>decode_table</span>[(<span class='ident'>input_chunk</span> <span class='op'>>></span> <span class='number'>40</span> <span class='op'>&</span> <span class='number'>0xFF</span>) <span class='kw'>as</span> <span class='ident'>usize</span>];
<span class='kw'>if</span> <span class='ident'>morsel</span> <span class='op'>==</span> <span class='ident'>tables</span>::<span class='ident'>INVALID_VALUE</span> {
<span class='ident'>bad_byte_index</span> <span class='op'>=</span> <span class='ident'>input_index</span> <span class='op'>+</span> <span class='number'>2</span>;
<span class='kw'>break</span>;
};
<span class='ident'>accum</span> <span class='op'>|=</span> (<span class='ident'>morsel</span> <span class='kw'>as</span> <span class='ident'>u64</span>) <span class='op'><<</span> <span class='number'>46</span>;
<span class='ident'>morsel</span> <span class='op'>=</span> <span class='ident'>decode_table</span>[(<span class='ident'>input_chunk</span> <span class='op'>>></span> <span class='number'>32</span> <span class='op'>&</span> <span class='number'>0xFF</span>) <span class='kw'>as</span> <span class='ident'>usize</span>];
<span class='kw'>if</span> <span class='ident'>morsel</span> <span class='op'>==</span> <span class='ident'>tables</span>::<span class='ident'>INVALID_VALUE</span> {
<span class='ident'>bad_byte_index</span> <span class='op'>=</span> <span class='ident'>input_index</span> <span class='op'>+</span> <span class='number'>3</span>;
<span class='kw'>break</span>;
};
<span class='ident'>accum</span> <span class='op'>|=</span> (<span class='ident'>morsel</span> <span class='kw'>as</span> <span class='ident'>u64</span>) <span class='op'><<</span> <span class='number'>40</span>;
<span class='ident'>morsel</span> <span class='op'>=</span> <span class='ident'>decode_table</span>[(<span class='ident'>input_chunk</span> <span class='op'>>></span> <span class='number'>24</span> <span class='op'>&</span> <span class='number'>0xFF</span>) <span class='kw'>as</span> <span class='ident'>usize</span>];
<span class='kw'>if</span> <span class='ident'>morsel</span> <span class='op'>==</span> <span class='ident'>tables</span>::<span class='ident'>INVALID_VALUE</span> {
<span class='ident'>bad_byte_index</span> <span class='op'>=</span> <span class='ident'>input_index</span> <span class='op'>+</span> <span class='number'>4</span>;
<span class='kw'>break</span>;
};
<span class='ident'>accum</span> <span class='op'>|=</span> (<span class='ident'>morsel</span> <span class='kw'>as</span> <span class='ident'>u64</span>) <span class='op'><<</span> <span class='number'>34</span>;
<span class='ident'>morsel</span> <span class='op'>=</span> <span class='ident'>decode_table</span>[(<span class='ident'>input_chunk</span> <span class='op'>>></span> <span class='number'>16</span> <span class='op'>&</span> <span class='number'>0xFF</span>) <span class='kw'>as</span> <span class='ident'>usize</span>];
<span class='kw'>if</span> <span class='ident'>morsel</span> <span class='op'>==</span> <span class='ident'>tables</span>::<span class='ident'>INVALID_VALUE</span> {
<span class='ident'>bad_byte_index</span> <span class='op'>=</span> <span class='ident'>input_index</span> <span class='op'>+</span> <span class='number'>5</span>;
<span class='kw'>break</span>;
};
<span class='ident'>accum</span> <span class='op'>|=</span> (<span class='ident'>morsel</span> <span class='kw'>as</span> <span class='ident'>u64</span>) <span class='op'><<</span> <span class='number'>28</span>;
<span class='ident'>morsel</span> <span class='op'>=</span> <span class='ident'>decode_table</span>[(<span class='ident'>input_chunk</span> <span class='op'>>></span> <span class='number'>8</span> <span class='op'>&</span> <span class='number'>0xFF</span>) <span class='kw'>as</span> <span class='ident'>usize</span>];
<span class='kw'>if</span> <span class='ident'>morsel</span> <span class='op'>==</span> <span class='ident'>tables</span>::<span class='ident'>INVALID_VALUE</span> {
<span class='ident'>bad_byte_index</span> <span class='op'>=</span> <span class='ident'>input_index</span> <span class='op'>+</span> <span class='number'>6</span>;
<span class='kw'>break</span>;
};
<span class='ident'>accum</span> <span class='op'>|=</span> (<span class='ident'>morsel</span> <span class='kw'>as</span> <span class='ident'>u64</span>) <span class='op'><<</span> <span class='number'>22</span>;
<span class='ident'>morsel</span> <span class='op'>=</span> <span class='ident'>decode_table</span>[(<span class='ident'>input_chunk</span> <span class='op'>&</span> <span class='number'>0xFF</span>) <span class='kw'>as</span> <span class='ident'>usize</span>];
<span class='kw'>if</span> <span class='ident'>morsel</span> <span class='op'>==</span> <span class='ident'>tables</span>::<span class='ident'>INVALID_VALUE</span> {
<span class='ident'>bad_byte_index</span> <span class='op'>=</span> <span class='ident'>input_index</span> <span class='op'>+</span> <span class='number'>7</span>;
<span class='kw'>break</span>;
};
<span class='ident'>accum</span> <span class='op'>|=</span> (<span class='ident'>morsel</span> <span class='kw'>as</span> <span class='ident'>u64</span>) <span class='op'><<</span> <span class='number'>16</span>;
<span class='ident'>BigEndian</span>::<span class='ident'>write_u64</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>buffer_slice</span>[(<span class='ident'>output_index</span>)..(<span class='ident'>output_index</span> <span class='op'>+</span> <span class='number'>8</span>)],
<span class='ident'>accum</span>);
<span class='ident'>output_index</span> <span class='op'>+=</span> <span class='number'>6</span>;
<span class='ident'>input_index</span> <span class='op'>+=</span> <span class='ident'>chunk_len</span>;
};
<span class='kw'>if</span> <span class='ident'>morsel</span> <span class='op'>==</span> <span class='ident'>tables</span>::<span class='ident'>INVALID_VALUE</span> {
<span class='comment'>// we got here from a break</span>
<span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>DecodeError</span>::<span class='ident'>InvalidByte</span>(<span class='ident'>bad_byte_index</span>, <span class='ident'>input_bytes</span>[<span class='ident'>bad_byte_index</span>]));
}
}
<span class='comment'>// Truncate off the last two bytes from writing the last u64.</span>
<span class='comment'>// Unconditional because we added on the extra 2 bytes in the resize before the loop,</span>
<span class='comment'>// so it will never underflow.</span>
<span class='kw'>let</span> <span class='ident'>new_len</span> <span class='op'>=</span> <span class='ident'>buffer</span>.<span class='ident'>len</span>() <span class='op'>-</span> (<span class='ident'>chunk_len</span> <span class='op'>-</span> <span class='ident'>decoded_chunk_len</span>);
<span class='ident'>buffer</span>.<span class='ident'>truncate</span>(<span class='ident'>new_len</span>);
<span class='comment'>// handle leftovers (at most 8 bytes, decoded to 6).</span>
<span class='comment'>// Use a u64 as a stack-resident 8 bytes buffer.</span>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>leftover_bits</span>: <span class='ident'>u64</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>morsels_in_leftover</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>padding_bytes</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>first_padding_index</span>: <span class='ident'>usize</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='kw'>for</span> (<span class='ident'>i</span>, <span class='ident'>b</span>) <span class='kw'>in</span> <span class='ident'>input_bytes</span>[<span class='ident'>length_of_full_chunks</span>..].<span class='ident'>iter</span>().<span class='ident'>enumerate</span>() {
<span class='comment'>// '=' padding</span>
<span class='kw'>if</span> <span class='kw-2'>*</span><span class='ident'>b</span> <span class='op'>==</span> <span class='number'>0x3D</span> {
<span class='comment'>// There can be bad padding in a few ways:</span>
<span class='comment'>// 1 - Padding with non-padding characters after it</span>
<span class='comment'>// 2 - Padding after zero or one non-padding characters before it</span>
<span class='comment'>// in the current quad.</span>
<span class='comment'>// 3 - More than two characters of padding. If 3 or 4 padding chars</span>
<span class='comment'>// are in the same quad, that implies it will be caught by #2.</span>
<span class='comment'>// If it spreads from one quad to another, it will be caught by</span>
<span class='comment'>// #2 in the second quad.</span>
<span class='kw'>if</span> <span class='ident'>i</span> <span class='op'>%</span> <span class='number'>4</span> <span class='op'><</span> <span class='number'>2</span> {
<span class='comment'>// Check for case #2.</span>
<span class='comment'>// TODO InvalidPadding error</span>
<span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>DecodeError</span>::<span class='ident'>InvalidByte</span>(<span class='ident'>length_of_full_chunks</span> <span class='op'>+</span> <span class='ident'>i</span>, <span class='kw-2'>*</span><span class='ident'>b</span>));
};
<span class='kw'>if</span> <span class='ident'>padding_bytes</span> <span class='op'>==</span> <span class='number'>0</span> {
<span class='ident'>first_padding_index</span> <span class='op'>=</span> <span class='ident'>i</span>;
};
<span class='ident'>padding_bytes</span> <span class='op'>+=</span> <span class='number'>1</span>;
<span class='kw'>continue</span>;
};
<span class='comment'>// Check for case #1.</span>
<span class='comment'>// To make '=' handling consistent with the main loop, don't allow</span>
<span class='comment'>// non-suffix '=' in trailing chunk either. Report error as first</span>
<span class='comment'>// erroneous padding.</span>
<span class='kw'>if</span> <span class='ident'>padding_bytes</span> <span class='op'>></span> <span class='number'>0</span> {
<span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>DecodeError</span>::<span class='ident'>InvalidByte</span>(
<span class='ident'>length_of_full_chunks</span> <span class='op'>+</span> <span class='ident'>first_padding_index</span>, <span class='number'>0x3D</span>));
};
<span class='comment'>// can use up to 8 * 6 = 48 bits of the u64, if last chunk has no padding.</span>
<span class='comment'>// To minimize shifts, pack the leftovers from left to right.</span>
<span class='kw'>let</span> <span class='ident'>shift</span> <span class='op'>=</span> <span class='number'>64</span> <span class='op'>-</span> (<span class='ident'>morsels_in_leftover</span> <span class='op'>+</span> <span class='number'>1</span>) <span class='op'>*</span> <span class='number'>6</span>;
<span class='comment'>// tables are all 256 elements, cannot overflow from a u8 index</span>
<span class='kw'>let</span> <span class='ident'>morsel</span> <span class='op'>=</span> <span class='ident'>decode_table</span>[<span class='kw-2'>*</span><span class='ident'>b</span> <span class='kw'>as</span> <span class='ident'>usize</span>];
<span class='kw'>if</span> <span class='ident'>morsel</span> <span class='op'>==</span> <span class='ident'>tables</span>::<span class='ident'>INVALID_VALUE</span> {
<span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>DecodeError</span>::<span class='ident'>InvalidByte</span>(<span class='ident'>length_of_full_chunks</span> <span class='op'>+</span> <span class='ident'>i</span>, <span class='kw-2'>*</span><span class='ident'>b</span>));
};
<span class='ident'>leftover_bits</span> <span class='op'>|=</span> (<span class='ident'>morsel</span> <span class='kw'>as</span> <span class='ident'>u64</span>) <span class='op'><<</span> <span class='ident'>shift</span>;
<span class='ident'>morsels_in_leftover</span> <span class='op'>+=</span> <span class='number'>1</span>;
};
<span class='kw'>let</span> <span class='ident'>leftover_bits_ready_to_append</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='ident'>morsels_in_leftover</span> {
<span class='number'>0</span> <span class='op'>=></span> <span class='number'>0</span>,
<span class='number'>1</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>DecodeError</span>::<span class='ident'>InvalidLength</span>),
<span class='number'>2</span> <span class='op'>=></span> <span class='number'>8</span>,
<span class='number'>3</span> <span class='op'>=></span> <span class='number'>16</span>,
<span class='number'>4</span> <span class='op'>=></span> <span class='number'>24</span>,
<span class='number'>5</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>DecodeError</span>::<span class='ident'>InvalidLength</span>),
<span class='number'>6</span> <span class='op'>=></span> <span class='number'>32</span>,
<span class='number'>7</span> <span class='op'>=></span> <span class='number'>40</span>,
<span class='number'>8</span> <span class='op'>=></span> <span class='number'>48</span>,
_ <span class='op'>=></span> <span class='macro'>panic</span><span class='macro'>!</span>(<span class='string'>"Impossible: must only have 0 to 4 input bytes in last quad"</span>)
};
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>leftover_bits_appended_to_buf</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='kw'>while</span> <span class='ident'>leftover_bits_appended_to_buf</span> <span class='op'><</span> <span class='ident'>leftover_bits_ready_to_append</span> {
<span class='comment'>// `as` simply truncates the higher bits, which is what we want here</span>
<span class='kw'>let</span> <span class='ident'>selected_bits</span> <span class='op'>=</span> (<span class='ident'>leftover_bits</span> <span class='op'>>></span> (<span class='number'>56</span> <span class='op'>-</span> <span class='ident'>leftover_bits_appended_to_buf</span>)) <span class='kw'>as</span> <span class='ident'>u8</span>;
<span class='ident'>buffer</span>.<span class='ident'>push</span>(<span class='ident'>selected_bits</span>);
<span class='ident'>leftover_bits_appended_to_buf</span> <span class='op'>+=</span> <span class='number'>8</span>;
};
<span class='prelude-val'>Ok</span>(())
}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
<span class='kw'>mod</span> <span class='ident'>tests</span> {
<span class='kw'>use</span> <span class='kw'>super</span>::<span class='kw-2'>*</span>;
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>encoded_size_correct</span>() {
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>0</span>, <span class='ident'>encoded_size</span>(<span class='number'>0</span>, <span class='ident'>STANDARD</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>4</span>, <span class='ident'>encoded_size</span>(<span class='number'>1</span>, <span class='ident'>STANDARD</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>4</span>, <span class='ident'>encoded_size</span>(<span class='number'>2</span>, <span class='ident'>STANDARD</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>4</span>, <span class='ident'>encoded_size</span>(<span class='number'>3</span>, <span class='ident'>STANDARD</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>8</span>, <span class='ident'>encoded_size</span>(<span class='number'>4</span>, <span class='ident'>STANDARD</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>8</span>, <span class='ident'>encoded_size</span>(<span class='number'>5</span>, <span class='ident'>STANDARD</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>8</span>, <span class='ident'>encoded_size</span>(<span class='number'>6</span>, <span class='ident'>STANDARD</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>12</span>, <span class='ident'>encoded_size</span>(<span class='number'>7</span>, <span class='ident'>STANDARD</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>12</span>, <span class='ident'>encoded_size</span>(<span class='number'>8</span>, <span class='ident'>STANDARD</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>12</span>, <span class='ident'>encoded_size</span>(<span class='number'>9</span>, <span class='ident'>STANDARD</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>72</span>, <span class='ident'>encoded_size</span>(<span class='number'>54</span>, <span class='ident'>STANDARD</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>76</span>, <span class='ident'>encoded_size</span>(<span class='number'>55</span>, <span class='ident'>STANDARD</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>76</span>, <span class='ident'>encoded_size</span>(<span class='number'>56</span>, <span class='ident'>STANDARD</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>76</span>, <span class='ident'>encoded_size</span>(<span class='number'>57</span>, <span class='ident'>STANDARD</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>80</span>, <span class='ident'>encoded_size</span>(<span class='number'>58</span>, <span class='ident'>STANDARD</span>));
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>encoded_size_correct_mime</span>() {
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>0</span>, <span class='ident'>encoded_size</span>(<span class='number'>0</span>, <span class='ident'>MIME</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>4</span>, <span class='ident'>encoded_size</span>(<span class='number'>1</span>, <span class='ident'>MIME</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>4</span>, <span class='ident'>encoded_size</span>(<span class='number'>2</span>, <span class='ident'>MIME</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>4</span>, <span class='ident'>encoded_size</span>(<span class='number'>3</span>, <span class='ident'>MIME</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>8</span>, <span class='ident'>encoded_size</span>(<span class='number'>4</span>, <span class='ident'>MIME</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>8</span>, <span class='ident'>encoded_size</span>(<span class='number'>5</span>, <span class='ident'>MIME</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>8</span>, <span class='ident'>encoded_size</span>(<span class='number'>6</span>, <span class='ident'>MIME</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>12</span>, <span class='ident'>encoded_size</span>(<span class='number'>7</span>, <span class='ident'>MIME</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>12</span>, <span class='ident'>encoded_size</span>(<span class='number'>8</span>, <span class='ident'>MIME</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>12</span>, <span class='ident'>encoded_size</span>(<span class='number'>9</span>, <span class='ident'>MIME</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>72</span>, <span class='ident'>encoded_size</span>(<span class='number'>54</span>, <span class='ident'>MIME</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>78</span>, <span class='ident'>encoded_size</span>(<span class='number'>55</span>, <span class='ident'>MIME</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>78</span>, <span class='ident'>encoded_size</span>(<span class='number'>56</span>, <span class='ident'>MIME</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>78</span>, <span class='ident'>encoded_size</span>(<span class='number'>57</span>, <span class='ident'>MIME</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>82</span>, <span class='ident'>encoded_size</span>(<span class='number'>58</span>, <span class='ident'>MIME</span>));
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>encoded_size_correct_lf</span>() {
<span class='kw'>let</span> <span class='ident'>config</span> <span class='op'>=</span> <span class='ident'>Config</span>::<span class='ident'>new</span>(
<span class='ident'>CharacterSet</span>::<span class='ident'>Standard</span>,
<span class='bool-val'>true</span>,
<span class='bool-val'>false</span>,
<span class='ident'>LineWrap</span>::<span class='ident'>Wrap</span>(<span class='number'>76</span>, <span class='ident'>LineEnding</span>::<span class='ident'>LF</span>)
);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>0</span>, <span class='ident'>encoded_size</span>(<span class='number'>0</span>, <span class='ident'>config</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>4</span>, <span class='ident'>encoded_size</span>(<span class='number'>1</span>, <span class='ident'>config</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>4</span>, <span class='ident'>encoded_size</span>(<span class='number'>2</span>, <span class='ident'>config</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>4</span>, <span class='ident'>encoded_size</span>(<span class='number'>3</span>, <span class='ident'>config</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>8</span>, <span class='ident'>encoded_size</span>(<span class='number'>4</span>, <span class='ident'>config</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>8</span>, <span class='ident'>encoded_size</span>(<span class='number'>5</span>, <span class='ident'>config</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>8</span>, <span class='ident'>encoded_size</span>(<span class='number'>6</span>, <span class='ident'>config</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>12</span>, <span class='ident'>encoded_size</span>(<span class='number'>7</span>, <span class='ident'>config</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>12</span>, <span class='ident'>encoded_size</span>(<span class='number'>8</span>, <span class='ident'>config</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>12</span>, <span class='ident'>encoded_size</span>(<span class='number'>9</span>, <span class='ident'>config</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>72</span>, <span class='ident'>encoded_size</span>(<span class='number'>54</span>, <span class='ident'>config</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>77</span>, <span class='ident'>encoded_size</span>(<span class='number'>55</span>, <span class='ident'>config</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>77</span>, <span class='ident'>encoded_size</span>(<span class='number'>56</span>, <span class='ident'>config</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>77</span>, <span class='ident'>encoded_size</span>(<span class='number'>57</span>, <span class='ident'>config</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>81</span>, <span class='ident'>encoded_size</span>(<span class='number'>58</span>, <span class='ident'>config</span>));
}
}
</pre>
</section>
<section id='search' class="content hidden"></section>
<section class="footer"></section>
<aside id="help" class="hidden">
<div>
<h1 class="hidden">Help</h1>
<div class="shortcuts">
<h2>Keyboard Shortcuts</h2>
<dl>
<dt>?</dt>
<dd>Show this help dialog</dd>
<dt>S</dt>
<dd>Focus the search field</dd>
<dt>⇤</dt>
<dd>Move up in search results</dd>
<dt>⇥</dt>
<dd>Move down in search results</dd>
<dt>⏎</dt>
<dd>Go to active search result</dd>
<dt>+</dt>
<dd>Collapse/expand all sections</dd>
</dl>
</div>
<div class="infos">
<h2>Search Tricks</h2>
<p>
Prefix searches with a type followed by a colon (e.g.
<code>fn:</code>) to restrict the search to a given type.
</p>
<p>
Accepted types are: <code>fn</code>, <code>mod</code>,
<code>struct</code>, <code>enum</code>,
<code>trait</code>, <code>type</code>, <code>macro</code>,
and <code>const</code>.
</p>
<p>
Search functions by type signature (e.g.
<code>vec -> usize</code> or <code>* -> vec</code>)
</p>
</div>
</div>
</aside>
<script>
window.rootPath = "../../";
window.currentCrate = "base64";
</script>
<script src="../../jquery.js"></script>
<script src="../../main.js"></script>
<script defer src="../../search-index.js"></script>
</body>
</html>