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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head><meta http-equiv="content-type" content="text/html; charset=ISO-8859-1" /><title>ExtractorSWF xref</title><link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" /></head><body><pre><a name="1" href="#1">1</a> <em class="comment">/*</em><a name="2" href="#2">2</a> <em class="comment"> * Heritrix</em><a name="3" href="#3">3</a> <em class="comment"> *</em><a name="4" href="#4">4</a> <em class="comment"> * $Id: ExtractorSWF.java,v 1.22 2006/04/29 00:41:12 gojomo Exp $</em><a name="5" href="#5">5</a> <em class="comment"> *</em><a name="6" href="#6">6</a> <em class="comment"> * Created on March 19, 2004</em><a name="7" href="#7">7</a> <em class="comment"> *</em><a name="8" href="#8">8</a> <em class="comment"> * Copyright (C) 2003 Internet Archive.</em><a name="9" href="#9">9</a> <em class="comment"> *</em><a name="10" href="#10">10</a> <em class="comment"> * This file is part of the Heritrix web crawler (crawler.archive.org).</em><a name="11" href="#11">11</a> <em class="comment"> *</em><a name="12" href="#12">12</a> <em class="comment"> * Heritrix is free software; you can redistribute it and/or modify</em><a name="13" href="#13">13</a> <em class="comment"> * it under the terms of the GNU Lesser Public License as published by</em><a name="14" href="#14">14</a> <em class="comment"> * the Free Software Foundation; either version 2.1 of the License, or</em><a name="15" href="#15">15</a> <em class="comment"> * any later version.</em><a name="16" href="#16">16</a> <em class="comment"> *</em><a name="17" href="#17">17</a> <em class="comment"> * Heritrix is distributed in the hope that it will be useful,</em><a name="18" href="#18">18</a> <em class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</em><a name="19" href="#19">19</a> <em class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</em><a name="20" href="#20">20</a> <em class="comment"> * GNU Lesser Public License for more details.</em><a name="21" href="#21">21</a> <em class="comment"> *</em><a name="22" href="#22">22</a> <em class="comment"> * You should have received a copy of the GNU Lesser Public License</em><a name="23" href="#23">23</a> <em class="comment"> * along with Heritrix; if not, write to the Free Software</em><a name="24" href="#24">24</a> <em class="comment"> * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</em><a name="25" href="#25">25</a> <em class="comment"> */</em><a name="26" href="#26">26</a> <a name="27" href="#27">27</a> <strong>package</strong> <a href="../../../../org/archive/crawler/extractor/package-summary.html">org.archive.crawler.extractor</a>;<a name="28" href="#28">28</a> <a name="29" href="#29">29</a> <strong>import</strong> java.io.IOException;<a name="30" href="#30">30</a> <strong>import</strong> java.io.InputStream;<a name="31" href="#31">31</a> <strong>import</strong> java.util.Enumeration;<a name="32" href="#32">32</a> <strong>import</strong> java.util.Vector;<a name="33" href="#33">33</a> <strong>import</strong> java.util.logging.Logger;<a name="34" href="#34">34</a> <a name="35" href="#35">35</a> <strong>import</strong> org.archive.crawler.datamodel.CoreAttributeConstants;<a name="36" href="#36">36</a> <strong>import</strong> org.archive.crawler.datamodel.CrawlURI;<a name="37" href="#37">37</a> <a name="38" href="#38">38</a> <strong>import</strong> com.anotherbigidea.flash.interfaces.SWFTagTypes;<a name="39" href="#39">39</a> <strong>import</strong> com.anotherbigidea.flash.interfaces.SWFVectors;<a name="40" href="#40">40</a> <strong>import</strong> com.anotherbigidea.flash.readers.SWFReader;<a name="41" href="#41">41</a> <strong>import</strong> com.anotherbigidea.flash.readers.TagParser;<a name="42" href="#42">42</a> <strong>import</strong> com.anotherbigidea.flash.structs.Rect;<a name="43" href="#43">43</a> <strong>import</strong> com.anotherbigidea.io.InStream;<a name="44" href="#44">44</a> <a name="45" href="#45">45</a> <em>/**<em>*</em></em><a name="46" href="#46">46</a> <em> * Extracts URIs from SWF (flash/shockwave) files.</em><a name="47" href="#47">47</a> <em> * </em><a name="48" href="#48">48</a> <em> * To test, here is a link to an swf that has links</em><a name="49" href="#49">49</a> <em> * embedded inside of it: <a href="http://www.hitspring.com/index.swf." target="alexandria_uri">http://www.hitspring.com/index.swf.</a></em><a name="50" href="#50">50</a> <em> *</em><a name="51" href="#51">51</a> <em> * @author Igor Ranitovic</em><a name="52" href="#52">52</a> <em> */</em><a name="53" href="#53">53</a> <strong>public</strong> <strong>class</strong> <a href="../../../../org/archive/crawler/extractor/ExtractorSWF.html">ExtractorSWF</a><a name="54" href="#54">54</a> <strong>extends</strong> <a href="../../../../org/archive/crawler/extractor/Extractor.html">Extractor</a><a name="55" href="#55">55</a> implements <a href="../../../../org/archive/crawler/datamodel/CoreAttributeConstants.html">CoreAttributeConstants</a> {<a name="56" href="#56">56</a> <strong>private</strong> <strong>static</strong> Logger logger =<a name="57" href="#57">57</a> Logger.getLogger(ExtractorSWF.<strong>class</strong>.getName());<a name="58" href="#58">58</a> <strong>protected</strong> <strong>long</strong> numberOfCURIsHandled = 0;<a name="59" href="#59">59</a> <strong>protected</strong> <strong>long</strong> numberOfLinksExtracted = 0;<a name="60" href="#60">60</a> <em class="comment">// TODO: consider if this should be even smaller, because anything </em><a name="61" href="#61">61</a> <em class="comment">// containing URLs wouldn't be this big</em><a name="62" href="#62">62</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> <strong>int</strong> MAX_READ_SIZE = 1024 * 1024; <em class="comment">// 1MB</em><a name="63" href="#63">63</a> <a name="64" href="#64">64</a> <em>/**<em>*</em></em><a name="65" href="#65">65</a> <em> * @param name</em><a name="66" href="#66">66</a> <em> */</em><a name="67" href="#67">67</a> <strong>public</strong> <a href="../../../../org/archive/crawler/extractor/ExtractorSWF.html">ExtractorSWF</a>(String name) {<a name="68" href="#68">68</a> <strong>super</strong>(name, <span class="string">"Flash extractor. Extracts URIs from SWF "</span> +<a name="69" href="#69">69</a> <span class="string">"(flash/shockwave) files."</span>);<a name="70" href="#70">70</a> }<a name="71" href="#71">71</a> <a name="72" href="#72">72</a> <strong>protected</strong> <strong>void</strong> extract(<a href="../../../../org/archive/crawler/datamodel/CrawlURI.html">CrawlURI</a> curi) {<a name="73" href="#73">73</a> <strong>if</strong> (!isHttpTransactionContentToProcess(curi)) {<a name="74" href="#74">74</a> <strong>return</strong>;<a name="75" href="#75">75</a> }<a name="76" href="#76">76</a> <a name="77" href="#77">77</a> String contentType = curi.getContentType();<a name="78" href="#78">78</a> <strong>if</strong> (contentType == <strong>null</strong>) {<a name="79" href="#79">79</a> <strong>return</strong>;<a name="80" href="#80">80</a> }<a name="81" href="#81">81</a> <strong>if</strong> ((contentType.toLowerCase().indexOf(<span class="string">"x-shockwave-flash"</span>) < 0)<a name="82" href="#82">82</a> && (!curi.toString().toLowerCase().endsWith(<span class="string">".swf"</span>))) {<a name="83" href="#83">83</a> <strong>return</strong>;<a name="84" href="#84">84</a> }<a name="85" href="#85">85</a> <a name="86" href="#86">86</a> numberOfCURIsHandled++;<a name="87" href="#87">87</a> <a name="88" href="#88">88</a> InputStream documentStream = <strong>null</strong>;<a name="89" href="#89">89</a> <em class="comment">// Get the SWF file's content stream.</em><a name="90" href="#90">90</a> <strong>try</strong> {<a name="91" href="#91">91</a> documentStream = curi.getHttpRecorder().getRecordedInput().<a name="92" href="#92">92</a> getContentReplayInputStream();<a name="93" href="#93">93</a> <strong>if</strong> (documentStream == <strong>null</strong>) {<a name="94" href="#94">94</a> <strong>return</strong>;<a name="95" href="#95">95</a> }<a name="96" href="#96">96</a> <a name="97" href="#97">97</a> <em class="comment">// Create SWF action that will add discoved URIs to CrawlURI</em><a name="98" href="#98">98</a> <em class="comment">// alist(s).</em><a name="99" href="#99">99</a> <a href="../../../../org/archive/crawler/extractor/CrawlUriSWFAction.html">CrawlUriSWFAction</a> curiAction = <strong>new</strong> <a href="../../../../org/archive/crawler/extractor/CrawlUriSWFAction.html">CrawlUriSWFAction</a>(curi,<a name="100" href="#100">100</a> getController());<a name="101" href="#101">101</a> <em class="comment">// Overwrite parsing of specific tags that might have URIs.</em><a name="102" href="#102">102</a> <a href="../../../../org/archive/crawler/extractor/CustomSWFTags.html">CustomSWFTags</a> customTags = <strong>new</strong> <a href="../../../../org/archive/crawler/extractor/CustomSWFTags.html">CustomSWFTags</a>(curiAction);<a name="103" href="#103">103</a> <em class="comment">// Get a SWFReader instance.</em><a name="104" href="#104">104</a> SWFReader reader =<a name="105" href="#105">105</a> <strong>new</strong> SWFReader(getTagParser(customTags), documentStream) {<a name="106" href="#106">106</a> <em>/**<em>*</em></em><a name="107" href="#107">107</a> <em> * Override because a corrupt SWF file can cause us to try</em><a name="108" href="#108">108</a> <em> * read lengths that are hundreds of megabytes in size</em><a name="109" href="#109">109</a> <em> * causing us to OOME.</em><a name="110" href="#110">110</a> <em> * </em><a name="111" href="#111">111</a> <em> * Below is copied from SWFReader parent class.</em><a name="112" href="#112">112</a> <em> */</em><a name="113" href="#113">113</a> <strong>public</strong> <strong>int</strong> readOneTag() throws IOException {<a name="114" href="#114">114</a> <strong>int</strong> header = mIn.readUI16();<a name="115" href="#115">115</a> <strong>int</strong> type = header >> 6; <em class="comment">//only want the top 10 bits</em>⌨️ 快捷键说明
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