gzippedinputstreamtest.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="84" href="#84">84</a>              <strong>new</strong> File(getTmpDir(), <strong>this</strong>.getClass().getName() + <span class="string">".gz"</span>);
<a name="85" href="#85">85</a>          OutputStream os = <strong>new</strong> BufferedOutputStream(<strong>new</strong> FileOutputStream(f));
<a name="86" href="#86">86</a>          <strong>for</strong> (<strong>int</strong> i = 0; i &lt; GZIPMEMBER_COUNT; i++) {
<a name="87" href="#87">87</a>              os.write(GzippedInputStream.gzip(TEXT.getBytes()));
<a name="88" href="#88">88</a>          }
<a name="89" href="#89">89</a>          os.close();
<a name="90" href="#90">90</a>          <strong>return</strong> f;
<a name="91" href="#91">91</a>      }
<a name="92" href="#92">92</a>      
<a name="93" href="#93">93</a>      <strong>public</strong> <strong>void</strong> testCountOfMembers()
<a name="94" href="#94">94</a>      throws IOException {
<a name="95" href="#95">95</a>          InputStream is =
<a name="96" href="#96">96</a>              <strong>new</strong> RepositionableRandomAccessInputStream(<strong>this</strong>.compressedFile);
<a name="97" href="#97">97</a>          <a href="../../../org/archive/io/GzippedInputStream.html">GzippedInputStream</a> gis = <strong>new</strong> <a href="../../../org/archive/io/GzippedInputStream.html">GzippedInputStream</a>(is);
<a name="98" href="#98">98</a>          <strong>int</strong> records = 0;
<a name="99" href="#99">99</a>          <em class="comment">// Get offset of second record.  Will use it later in tests below.</em>
<a name="100" href="#100">100</a>         <strong>long</strong> offsetOfSecondRecord = -1;
<a name="101" href="#101">101</a>         <strong>for</strong> (Iterator i = gis.iterator(); i.hasNext();) {
<a name="102" href="#102">102</a>             <strong>long</strong> offset = gis.position();
<a name="103" href="#103">103</a>             <strong>if</strong> (records == 1) {
<a name="104" href="#104">104</a>                 offsetOfSecondRecord = offset;
<a name="105" href="#105">105</a>             }
<a name="106" href="#106">106</a>             is = (InputStream)i.next();
<a name="107" href="#107">107</a>             records++;
<a name="108" href="#108">108</a>         }
<a name="109" href="#109">109</a>         assertTrue(<span class="string">"Record count is off "</span> + records,
<a name="110" href="#110">110</a>             records == GZIPMEMBER_COUNT);
<a name="111" href="#111">111</a>         gis.close();
<a name="112" href="#112">112</a>         
<a name="113" href="#113">113</a>         <em class="comment">// Test random record read.</em>
<a name="114" href="#114">114</a>         is = <strong>new</strong> RepositionableRandomAccessInputStream(<strong>this</strong>.compressedFile);
<a name="115" href="#115">115</a>         gis = <strong>new</strong> <a href="../../../org/archive/io/GzippedInputStream.html">GzippedInputStream</a>(is);
<a name="116" href="#116">116</a>         byte [] buffer = <strong>new</strong> byte[TEXT.length()];
<a name="117" href="#117">117</a>         <em class="comment">// Seek to second record, read in gzip header.</em>
<a name="118" href="#118">118</a>         gis.gzipMemberSeek(offsetOfSecondRecord);
<a name="119" href="#119">119</a>         gis.read(buffer);
<a name="120" href="#120">120</a>         String readString = <strong>new</strong> String(buffer);
<a name="121" href="#121">121</a>         assertEquals(<span class="string">"Failed read"</span>, TEXT, readString);
<a name="122" href="#122">122</a>         gis.close();
<a name="123" href="#123">123</a>         
<a name="124" href="#124">124</a>         <em class="comment">// Test the count we get makes sense after iterating through</em>
<a name="125" href="#125">125</a>         <em class="comment">// starting at second record.</em>
<a name="126" href="#126">126</a>         is = <strong>new</strong> RepositionableRandomAccessInputStream(<strong>this</strong>.compressedFile,
<a name="127" href="#127">127</a>             offsetOfSecondRecord);
<a name="128" href="#128">128</a>         gis = <strong>new</strong> <a href="../../../org/archive/io/GzippedInputStream.html">GzippedInputStream</a>(is);
<a name="129" href="#129">129</a>         records = 0;
<a name="130" href="#130">130</a>         <strong>for</strong> (<strong>final</strong> Iterator i = gis.iterator(); i.hasNext(); i.next()) {
<a name="131" href="#131">131</a>             records++;
<a name="132" href="#132">132</a>         }
<a name="133" href="#133">133</a>         assertEquals(records,
<a name="134" href="#134">134</a>             GZIPMEMBER_COUNT - 1 <em class="comment">/*<em class="comment">We started at 2nd record*/</em>);</em>
<a name="135" href="#135">135</a>         gis.close();
<a name="136" href="#136">136</a>     }
<a name="137" href="#137">137</a>     
<a name="138" href="#138">138</a>     <strong>public</strong> <strong>void</strong> testCompressedStream() throws IOException {
<a name="139" href="#139">139</a>         byte [] bytes = <span class="string">"test"</span>.getBytes();
<a name="140" href="#140">140</a>         ByteArrayInputStream baos = <strong>new</strong> ByteArrayInputStream(bytes);
<a name="141" href="#141">141</a>         assertFalse(GzippedInputStream.isCompressedStream(baos));
<a name="142" href="#142">142</a>         
<a name="143" href="#143">143</a>         byte [] gzippedMetaData = GzippedInputStream.gzip(bytes);
<a name="144" href="#144">144</a>         baos = <strong>new</strong> ByteArrayInputStream(gzippedMetaData);
<a name="145" href="#145">145</a>         assertTrue(GzippedInputStream.isCompressedStream(baos));
<a name="146" href="#146">146</a>         
<a name="147" href="#147">147</a>         gzippedMetaData = GzippedInputStream.gzip(bytes);
<a name="148" href="#148">148</a>         <strong>final</strong> RepositionableByteArrayInputStream rbaos =
<a name="149" href="#149">149</a>             <strong>new</strong> RepositionableByteArrayInputStream(gzippedMetaData);
<a name="150" href="#150">150</a>         <strong>final</strong> <strong>int</strong> totalBytes = gzippedMetaData.length;
<a name="151" href="#151">151</a>         assertTrue(GzippedInputStream.isCompressedRepositionableStream(rbaos));
<a name="152" href="#152">152</a>         <strong>long</strong> available = rbaos.available();
<a name="153" href="#153">153</a>         assertEquals(available, totalBytes);
<a name="154" href="#154">154</a>         assertEquals(rbaos.position(), 0);
<a name="155" href="#155">155</a>     }
<a name="156" href="#156">156</a>     
<a name="157" href="#157">157</a>     <strong>private</strong> <strong>class</strong> RepositionableByteArrayInputStream
<a name="158" href="#158">158</a>     <strong>extends</strong> ByteArrayInputStream implements RepositionableStream {
<a name="159" href="#159">159</a>         <strong>public</strong> RepositionableByteArrayInputStream(<strong>final</strong> byte [] bytes) {
<a name="160" href="#160">160</a>             <strong>super</strong>(bytes);
<a name="161" href="#161">161</a>         }
<a name="162" href="#162">162</a>         
<a name="163" href="#163">163</a>         <strong>public</strong> <strong>void</strong> position(<strong>long</strong> p) {
<a name="164" href="#164">164</a>             <strong>this</strong>.pos = (<strong>int</strong>)p;
<a name="165" href="#165">165</a>         }
<a name="166" href="#166">166</a>         <strong>public</strong> <strong>long</strong> position() {
<a name="167" href="#167">167</a>             <strong>return</strong> <strong>this</strong>.pos;
<a name="168" href="#168">168</a>         }
<a name="169" href="#169">169</a>     }
<a name="170" href="#170">170</a> }
</pre>
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