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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=UTF-8" /><title>Zlib xref</title><link type="text/css" rel="stylesheet" href="../../../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../../../apidocs/org/apache/mina/filter/compression/Zlib.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="jxr_comment">/*</em><a name="2" href="#2">2</a> <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one</em><a name="3" href="#3">3</a> <em class="jxr_comment"> * or more contributor license agreements. See the NOTICE file</em><a name="4" href="#4">4</a> <em class="jxr_comment"> * distributed with this work for additional information</em><a name="5" href="#5">5</a> <em class="jxr_comment"> * regarding copyright ownership. The ASF licenses this file</em><a name="6" href="#6">6</a> <em class="jxr_comment"> * to you under the Apache License, Version 2.0 (the</em><a name="7" href="#7">7</a> <em class="jxr_comment"> * "License"); you may not use this file except in compliance</em><a name="8" href="#8">8</a> <em class="jxr_comment"> * with the License. You may obtain a copy of the License at</em><a name="9" href="#9">9</a> <em class="jxr_comment"> *</em><a name="10" href="#10">10</a> <em class="jxr_comment"> * <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em><a name="11" href="#11">11</a> <em class="jxr_comment"> *</em><a name="12" href="#12">12</a> <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing,</em><a name="13" href="#13">13</a> <em class="jxr_comment"> * software distributed under the License is distributed on an</em><a name="14" href="#14">14</a> <em class="jxr_comment"> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</em><a name="15" href="#15">15</a> <em class="jxr_comment"> * KIND, either express or implied. See the License for the</em><a name="16" href="#16">16</a> <em class="jxr_comment"> * specific language governing permissions and limitations</em><a name="17" href="#17">17</a> <em class="jxr_comment"> * under the License.</em><a name="18" href="#18">18</a> <em class="jxr_comment"> *</em><a name="19" href="#19">19</a> <em class="jxr_comment"> */</em><a name="20" href="#20">20</a> <strong class="jxr_keyword">package</strong> org.apache.mina.filter.compression;<a name="21" href="#21">21</a> <a name="22" href="#22">22</a> <strong class="jxr_keyword">import</strong> java.io.IOException;<a name="23" href="#23">23</a> <a name="24" href="#24">24</a> <strong class="jxr_keyword">import</strong> org.apache.mina.common.IoBuffer;<a name="25" href="#25">25</a> <a name="26" href="#26">26</a> <strong class="jxr_keyword">import</strong> com.jcraft.jzlib.JZlib;<a name="27" href="#27">27</a> <strong class="jxr_keyword">import</strong> com.jcraft.jzlib.ZStream;<a name="28" href="#28">28</a> <a name="29" href="#29">29</a> <em class="jxr_javadoccomment">/**</em><a name="30" href="#30">30</a> <em class="jxr_javadoccomment"> * A helper class for interfacing with the JZlib library. This class acts both</em><a name="31" href="#31">31</a> <em class="jxr_javadoccomment"> * as a compressor and decompressor, but only as one at a time. The only</em><a name="32" href="#32">32</a> <em class="jxr_javadoccomment"> * flush method supported is <tt>Z_SYNC_FLUSH</tt> also known as <tt>Z_PARTIAL_FLUSH</tt></em><a name="33" href="#33">33</a> <em class="jxr_javadoccomment"> *</em><a name="34" href="#34">34</a> <em class="jxr_javadoccomment"> * @author The Apache MINA Project (dev@mina.apache.org)</em><a name="35" href="#35">35</a> <em class="jxr_javadoccomment"> * @version $Rev: 581234 $, $Date: 2007-10-02 07:39:48 -0600 (Tue, 02 Oct 2007) $</em><a name="36" href="#36">36</a> <em class="jxr_javadoccomment"> */</em><a name="37" href="#37">37</a> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/mina/filter/compression/Zlib.html">Zlib</a> {<a name="38" href="#38">38</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> COMPRESSION_MAX = JZlib.Z_BEST_COMPRESSION;<a name="39" href="#39">39</a> <a name="40" href="#40">40</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> COMPRESSION_MIN = JZlib.Z_BEST_SPEED;<a name="41" href="#41">41</a> <a name="42" href="#42">42</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> COMPRESSION_NONE = JZlib.Z_NO_COMPRESSION;<a name="43" href="#43">43</a> <a name="44" href="#44">44</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> COMPRESSION_DEFAULT = JZlib.Z_DEFAULT_COMPRESSION;<a name="45" href="#45">45</a> <a name="46" href="#46">46</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> MODE_DEFLATER = 1;<a name="47" href="#47">47</a> <a name="48" href="#48">48</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> MODE_INFLATER = 2;<a name="49" href="#49">49</a> <a name="50" href="#50">50</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> compressionLevel;<a name="51" href="#51">51</a> <a name="52" href="#52">52</a> <strong class="jxr_keyword">private</strong> ZStream zStream = <strong class="jxr_keyword">null</strong>;<a name="53" href="#53">53</a> <a name="54" href="#54">54</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> mode = -1;<a name="55" href="#55">55</a> <a name="56" href="#56">56</a> <em class="jxr_javadoccomment">/**</em><a name="57" href="#57">57</a> <em class="jxr_javadoccomment"> * @param compressionLevel the level of compression that should be used</em><a name="58" href="#58">58</a> <em class="jxr_javadoccomment"> * @param mode the mode in which the instance will operate. Can be either</em><a name="59" href="#59">59</a> <em class="jxr_javadoccomment"> * of <tt>MODE_DEFLATER</tt> or <tt>MODE_INFLATER</tt></em><a name="60" href="#60">60</a> <em class="jxr_javadoccomment"> */</em><a name="61" href="#61">61</a> <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/mina/filter/compression/Zlib.html">Zlib</a>(<strong class="jxr_keyword">int</strong> compressionLevel, <strong class="jxr_keyword">int</strong> mode) {<a name="62" href="#62">62</a> <strong class="jxr_keyword">switch</strong> (compressionLevel) {<a name="63" href="#63">63</a> <strong class="jxr_keyword">case</strong> COMPRESSION_MAX:<a name="64" href="#64">64</a> <strong class="jxr_keyword">case</strong> COMPRESSION_MIN:<a name="65" href="#65">65</a> <strong class="jxr_keyword">case</strong> COMPRESSION_NONE:<a name="66" href="#66">66</a> <strong class="jxr_keyword">case</strong> COMPRESSION_DEFAULT:<a name="67" href="#67">67</a> <strong class="jxr_keyword">this</strong>.compressionLevel = compressionLevel;<a name="68" href="#68">68</a> <strong class="jxr_keyword">break</strong>;<a name="69" href="#69">69</a> <strong class="jxr_keyword">default</strong>:<a name="70" href="#70">70</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(<a name="71" href="#71">71</a> <span class="jxr_string">"invalid compression level specified"</span>);<a name="72" href="#72">72</a> }<a name="73" href="#73">73</a> <a name="74" href="#74">74</a> <em class="jxr_comment">// create a new instance of ZStream. This will be done only once.</em><a name="75" href="#75">75</a> zStream = <strong class="jxr_keyword">new</strong> ZStream();<a name="76" href="#76">76</a> <a name="77" href="#77">77</a> <strong class="jxr_keyword">switch</strong> (mode) {<a name="78" href="#78">78</a> <strong class="jxr_keyword">case</strong> MODE_DEFLATER:<a name="79" href="#79">79</a> zStream.deflateInit(<strong class="jxr_keyword">this</strong>.compressionLevel);<a name="80" href="#80">80</a> <strong class="jxr_keyword">break</strong>;<a name="81" href="#81">81</a> <strong class="jxr_keyword">case</strong> MODE_INFLATER:<a name="82" href="#82">82</a> zStream.inflateInit();<a name="83" href="#83">83</a> <strong class="jxr_keyword">break</strong>;<a name="84" href="#84">84</a> <strong class="jxr_keyword">default</strong>:<a name="85" href="#85">85</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(<span class="jxr_string">"invalid mode specified"</span>);<a name="86" href="#86">86</a> }<a name="87" href="#87">87</a> <strong class="jxr_keyword">this</strong>.mode = mode;<a name="88" href="#88">88</a> }<a name="89" href="#89">89</a> <a name="90" href="#90">90</a> <em class="jxr_javadoccomment">/**</em><a name="91" href="#91">91</a> <em class="jxr_javadoccomment"> * @param inBuffer the {@link IoBuffer} to be decompressed. The contents</em><a name="92" href="#92">92</a> <em class="jxr_javadoccomment"> * of the buffer are transferred into a local byte array and the buffer is</em><a name="93" href="#93">93</a> <em class="jxr_javadoccomment"> * flipped and returned intact.</em><a name="94" href="#94">94</a> <em class="jxr_javadoccomment"> * @return the decompressed data</em>⌨️ 快捷键说明
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