arcreader.html

来自「网络爬虫开源代码」· HTML 代码 · 共 753 行 · 第 1/5 页

<a name="294" href="#294">294</a>                 }
<a name="295" href="#295">295</a>                 <em class="comment">// LOOP TERMINATION.</em>
<a name="296" href="#296">296</a>                 <strong>break</strong>;
<a name="297" href="#297">297</a>             } <strong>else</strong> <strong>if</strong> (c == HEADER_FIELD_SEPARATOR) {
<a name="298" href="#298">298</a>             	<strong>if</strong> (!isStrict() &amp;&amp; previous == HEADER_FIELD_SEPARATOR) {
<a name="299" href="#299">299</a>             		<em class="comment">// Early ARCs sometimes had multiple spaces between fields.</em>
<a name="300" href="#300">300</a>             		<strong>continue</strong>;
<a name="301" href="#301">301</a>             	}
<a name="302" href="#302">302</a>                 <strong>if</strong> (list != <strong>null</strong>) {
<a name="303" href="#303">303</a>                     list.add(buffer.toString());
<a name="304" href="#304">304</a>                 }
<a name="305" href="#305">305</a>                 <em class="comment">// reset to empty</em>
<a name="306" href="#306">306</a>                 buffer.setLength(0);
<a name="307" href="#307">307</a>             } <strong>else</strong> {
<a name="308" href="#308">308</a>                 buffer.append((<strong>char</strong>)c);
<a name="309" href="#309">309</a>             }
<a name="310" href="#310">310</a>         }
<a name="311" href="#311">311</a> 
<a name="312" href="#312">312</a>         <em class="comment">// List must have at least 3 elements in it and no more than 10.  If</em>
<a name="313" href="#313">313</a>         <em class="comment">// it has other than this, then bogus parse.</em>
<a name="314" href="#314">314</a>         <strong>if</strong> (list != <strong>null</strong> &amp;&amp; (list.size() &lt; 3 || list.size() > 100)) {
<a name="315" href="#315">315</a>             <strong>throw</strong> <strong>new</strong> IOException(<span class="string">"Unparseable header line: "</span> + list);
<a name="316" href="#316">316</a>         }
<a name="317" href="#317">317</a> 
<a name="318" href="#318">318</a>         <strong>return</strong> read;
<a name="319" href="#319">319</a>     }
<a name="320" href="#320">320</a> 
<a name="321" href="#321">321</a>     <em>/**<em>*</em></em>
<a name="322" href="#322">322</a> <em>     * Compute metadata fields.</em>
<a name="323" href="#323">323</a> <em>     *</em>
<a name="324" href="#324">324</a> <em>     * Here we check the meta field has right number of items in it.</em>
<a name="325" href="#325">325</a> <em>     *</em>
<a name="326" href="#326">326</a> <em>     * @param keys Keys to use composing headerFields map.</em>
<a name="327" href="#327">327</a> <em>     * @param values Values to set into the headerFields map.</em>
<a name="328" href="#328">328</a> <em>     * @param v The version of this ARC file.</em>
<a name="329" href="#329">329</a> <em>     * @param offset Offset into arc file.</em>
<a name="330" href="#330">330</a> <em>     *</em>
<a name="331" href="#331">331</a> <em>     * @return Metadata structure for this record.</em>
<a name="332" href="#332">332</a> <em>     *</em>
<a name="333" href="#333">333</a> <em>     * @exception IOException  If no. of keys doesn't match no. of values.</em>
<a name="334" href="#334">334</a> <em>     */</em>
<a name="335" href="#335">335</a>     <strong>private</strong> <a href="../../../../org/archive/io/arc/ARCRecordMetaData.html">ARCRecordMetaData</a> computeMetaData(List&lt;String> keys,
<a name="336" href="#336">336</a>     		List&lt;String> values, String v, <strong>long</strong> offset)
<a name="337" href="#337">337</a>     throws IOException {
<a name="338" href="#338">338</a>         <strong>if</strong> (keys.size() != values.size()) {
<a name="339" href="#339">339</a>             List&lt;String> originalValues = values;
<a name="340" href="#340">340</a>             <strong>if</strong> (!isStrict()) {
<a name="341" href="#341">341</a>                 values = fixSpaceInURL(values, keys.size());
<a name="342" href="#342">342</a>                 <em class="comment">// If values still doesn't match key size, try and do</em>
<a name="343" href="#343">343</a>                 <em class="comment">// further repair.</em>
<a name="344" href="#344">344</a> 	            <strong>if</strong> (keys.size() != values.size()) {
<a name="345" href="#345">345</a> 	            	<em class="comment">// Early ARCs had a space in mimetype.</em>
<a name="346" href="#346">346</a> 	            	<strong>if</strong> (values.size() == (keys.size() + 1) &amp;&amp;
<a name="347" href="#347">347</a> 	            			values.get(4).toLowerCase().startsWith(<span class="string">"charset="</span>)) {
<a name="348" href="#348">348</a> 	            		List&lt;String> nuvalues =
<a name="349" href="#349">349</a> 	            			<strong>new</strong> ArrayList&lt;String>(keys.size());
<a name="350" href="#350">350</a> 	            		nuvalues.add(0, values.get(0));
<a name="351" href="#351">351</a> 	            		nuvalues.add(1, values.get(1));
<a name="352" href="#352">352</a> 	            		nuvalues.add(2, values.get(2));
<a name="353" href="#353">353</a> 	            		nuvalues.add(3, values.get(3) + values.get(4));
<a name="354" href="#354">354</a> 	            		nuvalues.add(4, values.get(5));
<a name="355" href="#355">355</a> 	            		values = nuvalues;
<a name="356" href="#356">356</a> 	            	} <strong>else</strong> <strong>if</strong>((values.size() + 1) == keys.size() &amp;&amp;
<a name="357" href="#357">357</a>                             isLegitimateIPValue(values.get(1)) &amp;&amp;
<a name="358" href="#358">358</a>                             isDate(values.get(2)) &amp;&amp; isNumber(values.get(3))) {
<a name="359" href="#359">359</a>                         <em class="comment">// Mimetype is empty.</em>
<a name="360" href="#360">360</a>                         List&lt;String> nuvalues =
<a name="361" href="#361">361</a>                             <strong>new</strong> ArrayList&lt;String>(keys.size());
<a name="362" href="#362">362</a>                         nuvalues.add(0, values.get(0));
<a name="363" href="#363">363</a>                         nuvalues.add(1, values.get(1));
<a name="364" href="#364">364</a>                         nuvalues.add(2, values.get(2));
<a name="365" href="#365">365</a>                         nuvalues.add(3, <span class="string">"-"</span>);
<a name="366" href="#366">366</a>                         nuvalues.add(4, values.get(3));
<a name="367" href="#367">367</a>                         values = nuvalues;
<a name="368" href="#368">368</a>                     }
<a name="369" href="#369">369</a> 	            }
<a name="370" href="#370">370</a>         	}
<a name="371" href="#371">371</a>             <strong>if</strong> (keys.size() != values.size()) {
<a name="372" href="#372">372</a>                 <strong>throw</strong> <strong>new</strong> IOException(<span class="string">"Size of field name keys does"</span> +
<a name="373" href="#373">373</a>                     <span class="string">" not match count of field values: "</span> + values);
<a name="374" href="#374">374</a>             }
<a name="375" href="#375">375</a>             <em class="comment">// Note that field was fixed on stderr.</em>
<a name="376" href="#376">376</a>             logStdErr(Level.WARNING, <span class="string">"Fixed spaces in metadata line at "</span> +
<a name="377" href="#377">377</a>             	<span class="string">"offset "</span> + offset +
<a name="378" href="#378">378</a>                 <span class="string">" Original: "</span> + originalValues + <span class="string">", New: "</span> + values);
<a name="379" href="#379">379</a>         }
<a name="380" href="#380">380</a>         
<a name="381" href="#381">381</a>         Map&lt;Object, Object> headerFields =
<a name="382" href="#382">382</a>         	<strong>new</strong> HashMap&lt;Object, Object>(keys.size() + 2);
<a name="383" href="#383">383</a>         <strong>for</strong> (<strong>int</strong> i = 0; i &lt; keys.size(); i++) {
<a name="384" href="#384">384</a>             headerFields.put(keys.get(i), values.get(i));
<a name="385" href="#385">385</a>         }
<a name="386" href="#386">386</a>         
<a name="387" href="#387">387</a>         <em class="comment">// Add a check for tabs in URLs.  If any, replace with '%09'.</em>
<a name="388" href="#388">388</a>         <em class="comment">// See https://sourceforge.net/tracker/?group_id=73833&amp;atid=539099&amp;func=detail&amp;aid=1010966,</em>
<a name="389" href="#389">389</a>         <em class="comment">// [ 1010966 ] crawl.log has URIs with spaces in them.</em>
<a name="390" href="#390">390</a>         String url = (String)headerFields.get(URL_FIELD_KEY);
<a name="391" href="#391">391</a>         <strong>if</strong> (url != <strong>null</strong> &amp;&amp; url.indexOf('\t') >= 0) {
<a name="392" href="#392">392</a>             headerFields.put(URL_FIELD_KEY,
<a name="393" href="#393">393</a>                 TextUtils.replaceAll(<span class="string">"\t"</span>, url, <span class="string">"%09"</span>));
<a name="394" href="#394">394</a>         }
<a name="395" href="#395">395</a> 
<a name="396" href="#396">396</a>         headerFields.put(VERSION_FIELD_KEY, v);
<a name="397" href="#397">397</a>         headerFields.put(ABSOLUTE_OFFSET_KEY, <strong>new</strong>  Long(offset));
<a name="398" href="#398">398</a> 
<a name="399" href="#399">399</a>         <strong>return</strong> <strong>new</strong> <a href="../../../../org/archive/io/arc/ARCRecordMetaData.html">ARCRecordMetaData</a>(getReaderIdentifier(), headerFields);
<a name="400" href="#400">400</a>     }
<a name="401" href="#401">401</a>     
<a name="402" href="#402">402</a>     <strong>protected</strong> <strong>boolean</strong> isDate(<strong>final</strong> String date) {
<a name="403" href="#403">403</a>         <strong>if</strong> (date.length() != 14) {
<a name="404" href="#404">404</a>             <strong>return</strong> false;
<a name="405" href="#405">405</a>         }
<a name="406" href="#406">406</a>         <strong>return</strong> isNumber(date);
<a name="407" href="#407">407</a>     }
<a name="408" href="#408">408</a>     
<a name="409" href="#409">409</a>     <strong>protected</strong> <strong>boolean</strong> isNumber(<strong>final</strong> String n) {
<a name="410" href="#410">410</a>         <strong>for</strong> (<strong>int</strong> i = 0; i &lt; n.length(); i++) {
<a name="411" href="#411">411</a>             <strong>if</strong> (!Character.isDigit(n.charAt(i))) {
<a name="412" href="#412">412</a>                 <strong>return</strong> false;
<a name="413" href="#413">413</a>             }
<a name="414" href="#414">414</a>         }
<a name="415" href="#415">415</a>         <strong>return</strong> <strong>true</strong>;
<a name="416" href="#416">416</a>     }
<a name="417" href="#417">417</a>     
<a name="418" href="#418">418</a>     <strong>protected</strong> <strong>boolean</strong> isLegitimateIPValue(<strong>final</strong> String ip) {
<a name="419" href="#419">419</a>         <strong>if</strong> (<span class="string">"-"</span>.equals(ip)) {
<a name="420" href="#420">420</a>             <strong>return</strong> <strong>true</strong>;
<a name="421" href="#421">421</a>         }
<a name="422" href="#422">422</a>         Matcher m = InetAddressUtil.IPV4_QUADS.matcher(ip);
<a name="423" href="#423">423</a>         <strong>return</strong> m != <strong>null</strong> &amp;&amp; m.matches();
<a name="424" href="#424">424</a>     }
<a name="425" href="#425">425</a>     
<a name="426" href="#426">426</a>     <em>/**<em>*</em></em>
<a name="427" href="#427">427</a> <em>     * Fix space in URLs.</em>
<a name="428" href="#428">428</a> <em>     * The ARCWriter used to write into the ARC URLs with spaces in them.</em>
<a name="429" href="#429">429</a> <em>     * See &lt;a</em>
<a name="430" href="#430">430</a> <em>     * href="https://sourceforge.net/tracker/?group_id=73833&amp;atid=539099&amp;func=detail&amp;aid=1010966">[ 1010966 ]</em>
<a name="431" href="#431">431</a> <em>     * crawl.log has URIs with spaces in them&lt;/a>.</em>
<a name="432" href="#432">432</a> <em>     * This method does fix up on such headers converting all spaces found</em>
<a name="433" href="#433">433</a> <em>     * to '%20'.</em>
<a name="434" href="#434">434</a> <em>     * @param values List of metadata values.</em>
<a name="435" href="#435">435</a> <em>     * @param requiredSize Expected size of resultant values list.</em>
<a name="436" href="#436">436</a> <em>     * @return New list if we successfully fixed up values or original if</em>
<a name="437" href="#437">437</a> <em>     * fixup failed.</em>
<a name="438" href="#438">438</a> <em>     */</em>
<a name="439" href="#439">439</a>     <strong>protected</strong> List&lt;String> fixSpaceInURL(List&lt;String> values, <strong>int</strong> requiredSize) {
<a name="440" href="#440">440</a>         <em class="comment">// Do validity check. 3rd from last is a date of 14 numeric</em>
<a name="441" href="#441">441</a>         <em class="comment">// characters. The 4th from last is IP, all before the IP</em>
<a name="442" href="#442">442</a>         <em class="comment">// should be concatenated together with a '%20' joiner.</em>
<a name="443" href="#443">443</a>         <em class="comment">// In the below, '4' is 4th field from end which has the IP.</em>
<a name="444" href="#444">444</a>         <strong>if</strong> (!(values.size() > requiredSize) || values.size() &lt; 4) {