arcrecord.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="170" href="#170">170</a>                 !StatusLine.startsWithHTTP(statusLine)) {
<a name="171" href="#171">171</a>             <strong>throw</strong> <strong>new</strong> IOException(<span class="string">"Failed parse of http status line."</span>);
<a name="172" href="#172">172</a>         }
<a name="173" href="#173">173</a>         <strong>this</strong>.httpStatus = <strong>new</strong> StatusLine(statusLine);
<a name="174" href="#174">174</a>         
<a name="175" href="#175">175</a>         <em class="comment">// Save off all bytes read.  Keep them as bytes rather than</em>
<a name="176" href="#176">176</a>         <em class="comment">// convert to strings so we don't have to worry about encodings</em>
<a name="177" href="#177">177</a>         <em class="comment">// though this should never be a problem doing http headers since</em>
<a name="178" href="#178">178</a>         <em class="comment">// its all supposed to be ascii.</em>
<a name="179" href="#179">179</a>         ByteArrayOutputStream baos =
<a name="180" href="#180">180</a>             <strong>new</strong> ByteArrayOutputStream(statusBytes.length + 4 * 1024);
<a name="181" href="#181">181</a>         baos.write(statusBytes);
<a name="182" href="#182">182</a>         
<a name="183" href="#183">183</a>         <em class="comment">// Now read rest of the header lines looking for the separation</em>
<a name="184" href="#184">184</a>         <em class="comment">// between header and body.</em>
<a name="185" href="#185">185</a>         <strong>for</strong> (byte [] lineBytes = <strong>null</strong>; <strong>true</strong>;) {
<a name="186" href="#186">186</a>             lineBytes = HttpParser.readRawLine(getIn());
<a name="187" href="#187">187</a>             eolCharCount = getEolCharsCount(lineBytes);
<a name="188" href="#188">188</a>             <strong>if</strong> (eolCharCount &lt;= 0) {
<a name="189" href="#189">189</a>                 <strong>throw</strong> <strong>new</strong> IOException(<span class="string">"Failed reading http headers: "</span> +
<a name="190" href="#190">190</a>                     ((lineBytes != <strong>null</strong>)? <strong>new</strong> String(lineBytes): <strong>null</strong>));
<a name="191" href="#191">191</a>             }
<a name="192" href="#192">192</a>             <em class="comment">// Save the bytes read.</em>
<a name="193" href="#193">193</a>             baos.write(lineBytes);
<a name="194" href="#194">194</a>             <strong>if</strong> ((lineBytes.length - eolCharCount) &lt;= 0) {
<a name="195" href="#195">195</a>                 <em class="comment">// We've finished reading the http header.</em>
<a name="196" href="#196">196</a>                 <strong>break</strong>;
<a name="197" href="#197">197</a>             }
<a name="198" href="#198">198</a>         }
<a name="199" href="#199">199</a>         
<a name="200" href="#200">200</a>         byte [] headerBytes = baos.toByteArray();
<a name="201" href="#201">201</a>         <em class="comment">// Save off where body starts.</em>
<a name="202" href="#202">202</a>         <strong>this</strong>.getMetaData().setContentBegin(headerBytes.length);
<a name="203" href="#203">203</a>         ByteArrayInputStream bais =
<a name="204" href="#204">204</a>             <strong>new</strong> ByteArrayInputStream(headerBytes);
<a name="205" href="#205">205</a>         <strong>if</strong> (!bais.markSupported()) {
<a name="206" href="#206">206</a>             <strong>throw</strong> <strong>new</strong> IOException(<span class="string">"ByteArrayInputStream does not support mark"</span>);
<a name="207" href="#207">207</a>         }
<a name="208" href="#208">208</a>         bais.mark(headerBytes.length);
<a name="209" href="#209">209</a>         <em class="comment">// Read the status line.  Don't let it into the parseHeaders function.</em>
<a name="210" href="#210">210</a>         <em class="comment">// It doesn't know what to do with it.</em>
<a name="211" href="#211">211</a>         bais.read(statusBytes, 0, statusBytes.length);
<a name="212" href="#212">212</a>         <strong>this</strong>.httpHeaders = HttpParser.parseHeaders(bais,
<a name="213" href="#213">213</a>             ARCConstants.DEFAULT_ENCODING);
<a name="214" href="#214">214</a>         <strong>this</strong>.getMetaData().setStatusCode(Integer.toString(getStatusCode()));
<a name="215" href="#215">215</a>         bais.reset();
<a name="216" href="#216">216</a>         <strong>return</strong> bais;
<a name="217" href="#217">217</a>     }
<a name="218" href="#218">218</a>     
<a name="219" href="#219">219</a>     <em>/**<em>*</em></em>
<a name="220" href="#220">220</a> <em>     * Return status code for this record.</em>
<a name="221" href="#221">221</a> <em>     * </em>
<a name="222" href="#222">222</a> <em>     * This method will return -1 until the http header has been read.</em>
<a name="223" href="#223">223</a> <em>     * @return Status code.</em>
<a name="224" href="#224">224</a> <em>     */</em>
<a name="225" href="#225">225</a>     <strong>public</strong> <strong>int</strong> getStatusCode() {
<a name="226" href="#226">226</a>         <strong>return</strong> (<strong>this</strong>.httpStatus == <strong>null</strong>)? -1: <strong>this</strong>.httpStatus.getStatusCode();
<a name="227" href="#227">227</a>     }
<a name="228" href="#228">228</a>     
<a name="229" href="#229">229</a>     <em>/**<em>*</em></em>
<a name="230" href="#230">230</a> <em>     * @param bytes Array of bytes to examine for an EOL.</em>
<a name="231" href="#231">231</a> <em>     * @return Count of end-of-line characters or zero if none.</em>
<a name="232" href="#232">232</a> <em>     */</em>
<a name="233" href="#233">233</a>     <strong>private</strong> <strong>int</strong> getEolCharsCount(byte [] bytes) {
<a name="234" href="#234">234</a>         <strong>int</strong> count = 0;
<a name="235" href="#235">235</a>         <strong>if</strong> (bytes != <strong>null</strong> &amp;&amp; bytes.length >=1 &amp;&amp;
<a name="236" href="#236">236</a>                 bytes[bytes.length - 1] == '\n') {
<a name="237" href="#237">237</a>             count++;
<a name="238" href="#238">238</a>             <strong>if</strong> (bytes.length >=2 &amp;&amp; bytes[bytes.length -2] == '\r') {
<a name="239" href="#239">239</a>                 count++;
<a name="240" href="#240">240</a>             }
<a name="241" href="#241">241</a>         }
<a name="242" href="#242">242</a>         <strong>return</strong> count;
<a name="243" href="#243">243</a>     }
<a name="244" href="#244">244</a> 
<a name="245" href="#245">245</a>     <em>/**<em>*</em></em>
<a name="246" href="#246">246</a> <em>     * @return Meta data for this record.</em>
<a name="247" href="#247">247</a> <em>     */</em>
<a name="248" href="#248">248</a>     <strong>public</strong> <a href="../../../../org/archive/io/arc/ARCRecordMetaData.html">ARCRecordMetaData</a> getMetaData() {
<a name="249" href="#249">249</a>         <strong>return</strong> (ARCRecordMetaData)getHeader();
<a name="250" href="#250">250</a>     }
<a name="251" href="#251">251</a>     
<a name="252" href="#252">252</a>     <em>/**<em>*</em></em>
<a name="253" href="#253">253</a> <em>     * @return http headers (Only available after header has been read).</em>
<a name="254" href="#254">254</a> <em>     */</em>
<a name="255" href="#255">255</a>     <strong>public</strong> Header [] getHttpHeaders() {
<a name="256" href="#256">256</a>         <strong>return</strong> <strong>this</strong>.httpHeaders;
<a name="257" href="#257">257</a>     }
<a name="258" href="#258">258</a> 
<a name="259" href="#259">259</a>     <em>/**<em>*</em></em>
<a name="260" href="#260">260</a> <em>     * @return Next character in this ARCRecord's content else -1 if at end of</em>
<a name="261" href="#261">261</a> <em>     * this record.</em>
<a name="262" href="#262">262</a> <em>     * @throws IOException</em>
<a name="263" href="#263">263</a> <em>     */</em>
<a name="264" href="#264">264</a>     <strong>public</strong> <strong>int</strong> read() throws IOException {
<a name="265" href="#265">265</a>         <strong>int</strong> c = -1;
<a name="266" href="#266">266</a>         <strong>if</strong> (<strong>this</strong>.httpHeaderStream != <strong>null</strong> &amp;&amp;
<a name="267" href="#267">267</a>                 (<strong>this</strong>.httpHeaderStream.available() > 0)) {
<a name="268" href="#268">268</a>             <em class="comment">// If http header, return bytes from it before we go to underlying</em>
<a name="269" href="#269">269</a>             <em class="comment">// stream.</em>
<a name="270" href="#270">270</a>             c = <strong>this</strong>.httpHeaderStream.read();
<a name="271" href="#271">271</a>             <em class="comment">// If done with the header stream, null it out.</em>
<a name="272" href="#272">272</a>             <strong>if</strong> (<strong>this</strong>.httpHeaderStream.available() &lt;= 0) {
<a name="273" href="#273">273</a>                 <strong>this</strong>.httpHeaderStream = <strong>null</strong>;
<a name="274" href="#274">274</a>             }
<a name="275" href="#275">275</a>             incrementPosition();
<a name="276" href="#276">276</a>         } <strong>else</strong> {
<a name="277" href="#277">277</a>             c = <strong>super</strong>.read();
<a name="278" href="#278">278</a>         }
<a name="279" href="#279">279</a>         <strong>return</strong> c;
<a name="280" href="#280">280</a>     }
<a name="281" href="#281">281</a> 
<a name="282" href="#282">282</a>     <strong>public</strong> <strong>int</strong> read(byte [] b, <strong>int</strong> offset, <strong>int</strong> length) throws IOException {
<a name="283" href="#283">283</a>         <strong>int</strong> read = -1;
<a name="284" href="#284">284</a>         <strong>if</strong> (<strong>this</strong>.httpHeaderStream != <strong>null</strong> &amp;&amp;
<a name="285" href="#285">285</a>                 (<strong>this</strong>.httpHeaderStream.available() > 0)) {
<a name="286" href="#286">286</a>             <em class="comment">// If http header, return bytes from it before we go to underlying</em>
<a name="287" href="#287">287</a>             <em class="comment">// stream.</em>
<a name="288" href="#288">288</a>             read = Math.min(length, <strong>this</strong>.httpHeaderStream.available());
<a name="289" href="#289">289</a>             <strong>if</strong> (read == 0) {
<a name="290" href="#290">290</a>                 read = -1;
<a name="291" href="#291">291</a>             } <strong>else</strong> {
<a name="292" href="#292">292</a>                 read = <strong>this</strong>.httpHeaderStream.read(b, offset, read);
<a name="293" href="#293">293</a>             }
<a name="294" href="#294">294</a>             <em class="comment">// If done with the header stream, null it out.</em>
<a name="295" href="#295">295</a>             <strong>if</strong> (<strong>this</strong>.httpHeaderStream.available() &lt;= 0) {
<a name="296" href="#296">296</a>                 <strong>this</strong>.httpHeaderStream = <strong>null</strong>;
<a name="297" href="#297">297</a>             }
<a name="298" href="#298">298</a>             incrementPosition(read);
<a name="299" href="#299">299</a>         } <strong>else</strong> {
<a name="300" href="#300">300</a>             read = <strong>super</strong>.read(b, offset, length);
<a name="301" href="#301">301</a>         }
<a name="302" href="#302">302</a>         <strong>return</strong> read;
<a name="303" href="#303">303</a>     }
<a name="304" href="#304">304</a> 
<a name="305" href="#305">305</a>     <em>/**<em>*</em></em>
<a name="306" href="#306">306</a> <em>     * @return Offset at which the body begins (Only known after</em>
<a name="307" href="#307">307</a> <em>     * header has been read) or -1 if none or if we haven't read</em>
<a name="308" href="#308">308</a> <em>     * headers yet.  Usually length of HTTP headers (does not include ARC</em>
<a name="309" href="#309">309</a> <em>     * metadata line length).</em>
<a name="310" href="#310">310</a> <em>     */</em>
<a name="311" href="#311">311</a>     <strong>public</strong> <strong>int</strong> getBodyOffset() {
<a name="312" href="#312">312</a>         <strong>return</strong> <strong>this</strong>.getMetaData().getContentBegin();
<a name="313" href="#313">313</a>     }
<a name="314" href="#314">314</a>     
<a name="315" href="#315">315</a>     @Override
<a name="316" href="#316">316</a>     <strong>protected</strong> String getIp4Cdx(<a href="../../../../org/archive/io/ArchiveRecordHeader.html">ArchiveRecordHeader</a> h) {
<a name="317" href="#317">317</a>     	String result = <strong>null</strong>;
<a name="318" href="#318">318</a>     	<strong>if</strong> (h instanceof ARCRecordMetaData) {
<a name="319" href="#319">319</a>     		result = ((ARCRecordMetaData)h).getIp();
<a name="320" href="#320">320</a>     	}
<a name="321" href="#321">321</a>     	<strong>return</strong> (result != <strong>null</strong>)? result: <strong>super</strong>.getIp4Cdx(h);
<a name="322" href="#322">322</a>     }
<a name="323" href="#323">323</a>     
<a name="324" href="#324">324</a>     @Override
<a name="325" href="#325">325</a> 	<strong>protected</strong> String getStatusCode4Cdx(<a href="../../../../org/archive/io/ArchiveRecordHeader.html">ArchiveRecordHeader</a> h) {
<a name="326" href="#326">326</a> 		String result = <strong>null</strong>;
<a name="327" href="#327">327</a> 		<strong>if</strong> (h instanceof ARCRecordMetaData) {
<a name="328" href="#328">328</a> 			result = ((ARCRecordMetaData) h).getStatusCode();
<a name="329" href="#329">329</a> 		}
<a name="330" href="#330">330</a> 		<strong>return</strong> (result != <strong>null</strong>) ? result: <strong>super</strong>.getStatusCode4Cdx(h);
<a name="331" href="#331">331</a> 	}
<a name="332" href="#332">332</a>     
<a name="333" href="#333">333</a>     @Override
<a name="334" href="#334">334</a> 	<strong>protected</strong> String getDigest4Cdx(<a href="../../../../org/archive/io/ArchiveRecordHeader.html">ArchiveRecordHeader</a> h) {
<a name="335" href="#335">335</a> 		String result = <strong>null</strong>;
<a name="336" href="#336">336</a> 		<strong>if</strong> (h instanceof ARCRecordMetaData) {
<a name="337" href="#337">337</a> 			result = ((ARCRecordMetaData) h).getDigest();
<a name="338" href="#338">338</a> 		}
<a name="339" href="#339">339</a> 		<strong>return</strong> (result != <strong>null</strong>) ? result: <strong>super</strong>.getDigest4Cdx(h);
<a name="340" href="#340">340</a> 	}
<a name="341" href="#341">341</a> }
</pre>
<hr/><div id="footer">This page was automatically generated by <a href="http://maven.apache.org/">Maven</a></div></body>
</html>