archiverecord.html

用JAVA编写的,在做实验的时候留下来的,本来想删的,但是传上来,大家分享吧

<a name="188" href="#188">188</a> 			<strong>if</strong> (c == -1) {
<a name="189" href="#189">189</a> 				<strong>throw</strong> <strong>new</strong> IOException(<span class="string">"Premature EOF before end-of-record."</span>);
<a name="190" href="#190">190</a> 			}
<a name="191" href="#191">191</a> 			<strong>if</strong> (<strong>this</strong>.digest != <strong>null</strong>) {
<a name="192" href="#192">192</a> 				<strong>this</strong>.digest.update((byte) c);
<a name="193" href="#193">193</a> 			}
<a name="194" href="#194">194</a> 		}
<a name="195" href="#195">195</a> 		incrementPosition();
<a name="196" href="#196">196</a> 		<strong>return</strong> c;
<a name="197" href="#197">197</a> 	}
<a name="198" href="#198">198</a> 
<a name="199" href="#199">199</a>     <strong>public</strong> <strong>int</strong> read(byte[] b, <strong>int</strong> offset, <strong>int</strong> length) throws IOException {
<a name="200" href="#200">200</a> 		<strong>int</strong> read = Math.min(length, available());
<a name="201" href="#201">201</a> 		<strong>if</strong> (read == -1 || read == 0) {
<a name="202" href="#202">202</a> 			read = -1;
<a name="203" href="#203">203</a> 		} <strong>else</strong> {
<a name="204" href="#204">204</a> 			read = <strong>this</strong>.in.read(b, offset, read);
<a name="205" href="#205">205</a> 			<strong>if</strong> (read == -1) {
<a name="206" href="#206">206</a> 				String msg = <span class="string">"Premature EOF before end-of-record: "</span>
<a name="207" href="#207">207</a> 					+ getHeader().getHeaderFields();
<a name="208" href="#208">208</a> 				<strong>if</strong> (isStrict()) {
<a name="209" href="#209">209</a> 					<strong>throw</strong> <strong>new</strong> IOException(msg);
<a name="210" href="#210">210</a> 				}
<a name="211" href="#211">211</a> 				setEor(<strong>true</strong>);
<a name="212" href="#212">212</a> 				System.err.println(Level.WARNING.toString() + <span class="string">" "</span> + msg);
<a name="213" href="#213">213</a> 			}
<a name="214" href="#214">214</a> 			<strong>if</strong> (<strong>this</strong>.digest != <strong>null</strong> &amp;&amp; read >= 0) {
<a name="215" href="#215">215</a> 				<strong>this</strong>.digest.update(b, offset, read);
<a name="216" href="#216">216</a> 			}
<a name="217" href="#217">217</a> 		}
<a name="218" href="#218">218</a> 		incrementPosition(read);
<a name="219" href="#219">219</a> 		<strong>return</strong> read;
<a name="220" href="#220">220</a> 	}
<a name="221" href="#221">221</a> 
<a name="222" href="#222">222</a>     <em>/**<em>*</em></em>
<a name="223" href="#223">223</a> <em>	 * This available is not the stream's available. Its an available based on</em>
<a name="224" href="#224">224</a> <em>	 * what the stated Archive record length is minus what we've read to date.</em>
<a name="225" href="#225">225</a> <em>	 * </em>
<a name="226" href="#226">226</a> <em>	 * @return True if bytes remaining in record content.</em>
<a name="227" href="#227">227</a> <em>	 */</em>
<a name="228" href="#228">228</a>     <strong>public</strong> <strong>int</strong> available() {
<a name="229" href="#229">229</a>         <strong>return</strong> (<strong>int</strong>)(getHeader().getLength() - getPosition());
<a name="230" href="#230">230</a>     }
<a name="231" href="#231">231</a> 
<a name="232" href="#232">232</a>     <em>/**<em>*</em></em>
<a name="233" href="#233">233</a> <em>     * Skip over this records content.</em>
<a name="234" href="#234">234</a> <em>     *</em>
<a name="235" href="#235">235</a> <em>     * @throws IOException</em>
<a name="236" href="#236">236</a> <em>     */</em>
<a name="237" href="#237">237</a>     <strong>void</strong> skip() throws IOException {
<a name="238" href="#238">238</a>         <strong>if</strong> (<strong>this</strong>.eor) {
<a name="239" href="#239">239</a>             <strong>return</strong>;
<a name="240" href="#240">240</a>         }
<a name="241" href="#241">241</a>         
<a name="242" href="#242">242</a>         <em class="comment">// Read to the end of the body of the record.  Exhaust the stream.</em>
<a name="243" href="#243">243</a>         <em class="comment">// Can't skip direct to end because underlying stream may be compressed</em>
<a name="244" href="#244">244</a>         <em class="comment">// and we're calculating the digest for the record.</em>
<a name="245" href="#245">245</a>         <strong>if</strong> (available() > 0) {
<a name="246" href="#246">246</a>             skip(available());
<a name="247" href="#247">247</a>         }
<a name="248" href="#248">248</a>     }
<a name="249" href="#249">249</a>     
<a name="250" href="#250">250</a>     <strong>public</strong> <strong>long</strong> skip(<strong>long</strong> n) throws IOException {
<a name="251" href="#251">251</a>         <strong>final</strong> <strong>int</strong> SKIP_BUFFERSIZE = 1024 * 4;
<a name="252" href="#252">252</a>         byte[] b = <strong>new</strong> byte[SKIP_BUFFERSIZE];
<a name="253" href="#253">253</a>         <strong>long</strong> total = 0;
<a name="254" href="#254">254</a>         <strong>for</strong> (<strong>int</strong> read = 0; (total &lt; n) &amp;&amp; (read != -1);) {
<a name="255" href="#255">255</a>             read = Math.min(SKIP_BUFFERSIZE, (<strong>int</strong>) (n - total));
<a name="256" href="#256">256</a>             <em class="comment">// TODO: Interesting is that reading from compressed stream, we only</em>
<a name="257" href="#257">257</a>             <em class="comment">// read about 500 characters at a time though we ask for 4k.</em>
<a name="258" href="#258">258</a>             <em class="comment">// Look at this sometime.</em>
<a name="259" href="#259">259</a>             read = read(b, 0, read);
<a name="260" href="#260">260</a>             <strong>if</strong> (read &lt;= 0) {
<a name="261" href="#261">261</a>                 read = -1;
<a name="262" href="#262">262</a>             } <strong>else</strong> {
<a name="263" href="#263">263</a>                 total += read;
<a name="264" href="#264">264</a>             }
<a name="265" href="#265">265</a>         }
<a name="266" href="#266">266</a>         <strong>return</strong> total;
<a name="267" href="#267">267</a>     }
<a name="268" href="#268">268</a> 
<a name="269" href="#269">269</a>     <em>/**<em>*</em></em>
<a name="270" href="#270">270</a> <em>     * @return Returns the strict.</em>
<a name="271" href="#271">271</a> <em>     */</em>
<a name="272" href="#272">272</a>     <strong>public</strong> <strong>boolean</strong> isStrict() {
<a name="273" href="#273">273</a>         <strong>return</strong> <strong>this</strong>.strict;
<a name="274" href="#274">274</a>     }
<a name="275" href="#275">275</a> 
<a name="276" href="#276">276</a>     <em>/**<em>*</em></em>
<a name="277" href="#277">277</a> <em>     * @param strict The strict to set.</em>
<a name="278" href="#278">278</a> <em>     */</em>
<a name="279" href="#279">279</a>     <strong>public</strong> <strong>void</strong> setStrict(<strong>boolean</strong> strict) {
<a name="280" href="#280">280</a>         <strong>this</strong>.strict = strict;
<a name="281" href="#281">281</a>     }
<a name="282" href="#282">282</a> 
<a name="283" href="#283">283</a> 	<strong>protected</strong> InputStream getIn() {
<a name="284" href="#284">284</a> 		<strong>return</strong> <strong>this</strong>.in;
<a name="285" href="#285">285</a> 	}
<a name="286" href="#286">286</a> 
<a name="287" href="#287">287</a> 	<strong>public</strong> String getDigestStr() {
<a name="288" href="#288">288</a> 		<strong>return</strong> <strong>this</strong>.digestStr;
<a name="289" href="#289">289</a> 	}
<a name="290" href="#290">290</a> 	
<a name="291" href="#291">291</a> 	<strong>protected</strong> <strong>void</strong> incrementPosition() {
<a name="292" href="#292">292</a> 		<strong>this</strong>.position++;
<a name="293" href="#293">293</a> 	}
<a name="294" href="#294">294</a> 	
<a name="295" href="#295">295</a> 	<strong>protected</strong> <strong>void</strong> incrementPosition(<strong>final</strong> <strong>long</strong> incr) {
<a name="296" href="#296">296</a> 		<strong>this</strong>.position += incr;
<a name="297" href="#297">297</a> 	}
<a name="298" href="#298">298</a> 	
<a name="299" href="#299">299</a> 	<strong>protected</strong> <strong>long</strong> getPosition() {
<a name="300" href="#300">300</a> 		<strong>return</strong> <strong>this</strong>.position;
<a name="301" href="#301">301</a> 	}
<a name="302" href="#302">302</a> 
<a name="303" href="#303">303</a> 	<strong>protected</strong> <strong>boolean</strong> isEor() {
<a name="304" href="#304">304</a> 		<strong>return</strong> eor;
<a name="305" href="#305">305</a> 	}
<a name="306" href="#306">306</a> 
<a name="307" href="#307">307</a> 	<strong>protected</strong> <strong>void</strong> setEor(<strong>boolean</strong> eor) {
<a name="308" href="#308">308</a> 		<strong>this</strong>.eor = eor;
<a name="309" href="#309">309</a> 	}
<a name="310" href="#310">310</a> 	
<a name="311" href="#311">311</a> 	<strong>protected</strong> String getStatusCode4Cdx(<strong>final</strong> <a href="../../../org/archive/io/ArchiveRecordHeader.html">ArchiveRecordHeader</a> h) {
<a name="312" href="#312">312</a> 		<strong>return</strong> <span class="string">"-"</span>;
<a name="313" href="#313">313</a> 	}
<a name="314" href="#314">314</a> 	
<a name="315" href="#315">315</a> 	<strong>protected</strong> String getIp4Cdx(<strong>final</strong> <a href="../../../org/archive/io/ArchiveRecordHeader.html">ArchiveRecordHeader</a> h) {
<a name="316" href="#316">316</a> 		<strong>return</strong> <span class="string">"-"</span>;
<a name="317" href="#317">317</a> 	}
<a name="318" href="#318">318</a> 	
<a name="319" href="#319">319</a> 	<strong>protected</strong> String getDigest4Cdx(<strong>final</strong> <a href="../../../org/archive/io/ArchiveRecordHeader.html">ArchiveRecordHeader</a> h) {
<a name="320" href="#320">320</a> 		<strong>return</strong> getDigestStr() == <strong>null</strong>? <span class="string">"-"</span>: getDigestStr();
<a name="321" href="#321">321</a> 	}
<a name="322" href="#322">322</a>     
<a name="323" href="#323">323</a>     <strong>protected</strong> String getMimetype4Cdx(<strong>final</strong> <a href="../../../org/archive/io/ArchiveRecordHeader.html">ArchiveRecordHeader</a> h) {
<a name="324" href="#324">324</a>         <strong>return</strong> h.getMimetype();
<a name="325" href="#325">325</a>     }
<a name="326" href="#326">326</a> 
<a name="327" href="#327">327</a>     <strong>protected</strong> String outputCdx(<strong>final</strong> String strippedFileName)
<a name="328" href="#328">328</a>     throws IOException {
<a name="329" href="#329">329</a>         <em class="comment">// Read the whole record so we get out a hash. Should be safe calling</em>
<a name="330" href="#330">330</a>     	<em class="comment">// close on already closed Record.</em>
<a name="331" href="#331">331</a>         close();
<a name="332" href="#332">332</a>         <a href="../../../org/archive/io/ArchiveRecordHeader.html">ArchiveRecordHeader</a> h = getHeader();
<a name="333" href="#333">333</a>         StringBuilder buffer =
<a name="334" href="#334">334</a>         	<strong>new</strong> StringBuilder(ArchiveFileConstants.CDX_LINE_BUFFER_SIZE);
<a name="335" href="#335">335</a>         buffer.append(h.getDate());
<a name="336" href="#336">336</a>         buffer.append(ArchiveFileConstants.SINGLE_SPACE);
<a name="337" href="#337">337</a>         buffer.append(getIp4Cdx(h));
<a name="338" href="#338">338</a>         buffer.append(ArchiveFileConstants.SINGLE_SPACE);
<a name="339" href="#339">339</a>         buffer.append(h.getUrl());
<a name="340" href="#340">340</a>         buffer.append(ArchiveFileConstants.SINGLE_SPACE);
<a name="341" href="#341">341</a>         buffer.append(getMimetype4Cdx(h));
<a name="342" href="#342">342</a>         buffer.append(ArchiveFileConstants.SINGLE_SPACE);
<a name="343" href="#343">343</a>         buffer.append(getStatusCode4Cdx(h));
<a name="344" href="#344">344</a>         buffer.append(ArchiveFileConstants.SINGLE_SPACE);
<a name="345" href="#345">345</a>         buffer.append(getDigest4Cdx(h));
<a name="346" href="#346">346</a>         buffer.append(ArchiveFileConstants.SINGLE_SPACE);
<a name="347" href="#347">347</a>         buffer.append(h.getOffset());
<a name="348" href="#348">348</a>         buffer.append(ArchiveFileConstants.SINGLE_SPACE);
<a name="349" href="#349">349</a>         buffer.append(h.getLength());
<a name="350" href="#350">350</a>         buffer.append(ArchiveFileConstants.SINGLE_SPACE);
<a name="351" href="#351">351</a>         buffer.append(strippedFileName != <strong>null</strong>? strippedFileName: '-');
<a name="352" href="#352">352</a>         <strong>return</strong> buffer.toString();
<a name="353" href="#353">353</a>     }
<a name="354" href="#354">354</a>     
<a name="355" href="#355">355</a>     <em>/**<em>*</em></em>
<a name="356" href="#356">356</a> <em>     * Writes output on STDOUT.</em>
<a name="357" href="#357">357</a> <em>     * @throws IOException</em>
<a name="358" href="#358">358</a> <em>     */</em>
<a name="359" href="#359">359</a>     <strong>public</strong> <strong>void</strong> dump()
<a name="360" href="#360">360</a>     throws IOException {
<a name="361" href="#361">361</a>     	dump(System.out);
<a name="362" href="#362">362</a>     }
<a name="363" href="#363">363</a>     
<a name="364" href="#364">364</a>     <em>/**<em>*</em></em>
<a name="365" href="#365">365</a> <em>     * Writes output on passed &lt;code>os&lt;/code>.</em>
<a name="366" href="#366">366</a> <em>     * @throws IOException</em>
<a name="367" href="#367">367</a> <em>     */</em>
<a name="368" href="#368">368</a>     <strong>public</strong> <strong>void</strong> dump(<strong>final</strong> OutputStream os)
<a name="369" href="#369">369</a>     throws IOException {
<a name="370" href="#370">370</a>     	<strong>final</strong> byte [] outputBuffer = <strong>new</strong> byte [16*1024];
<a name="371" href="#371">371</a>         <strong>int</strong> read = outputBuffer.length;
<a name="372" href="#372">372</a>         <strong>while</strong> ((read = read(outputBuffer, 0, outputBuffer.length)) != -1) {
<a name="373" href="#373">373</a>             os.write(outputBuffer, 0, read);
<a name="374" href="#374">374</a>         }
<a name="375" href="#375">375</a>         os.flush();
<a name="376" href="#376">376</a>     }
<a name="377" href="#377">377</a> }
</pre>
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