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POProcessing a BZIP string/file in Scala
 

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  1. POProcessing a BZIP string/file in Scala
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    <p>I'm punishing myself a bit by doing the python challenges series in Scala.</p> <p>Now, one of the challenges is to read in a string that's been compressed using the bzip algorithm and output the result.</p> <pre><code>BZh91AY&amp;SYA\xaf\x82\r\x00\x00\x01\x01\x80\x02\xc0\x02\x00 \x00!\x9ah3M\x07&lt;]\xc9\x14\xe1BA\x06\xbe\x084 </code></pre> <p>Now, after some digging it appears as if there isn't a standard java library for bzip processing, but there is something in the apache ant project, <a href="http://www.kohsuke.org/bzip2/" rel="nofollow">that this guy</a> has kindly taken out for use as a separate library.</p> <p>The thing is, I can't seem to get it to work with the following code, it just hangs in the scala REPL and the JVM maxes out at 100% CPU usage</p> <p>This is the code I'm trying...</p> <pre><code>import java.io.{ByteArrayInputStream} import org.apache.tools.bzip2.{CBZip2InputStream} import org.apache.commons.io.{IOUtils} object ChallengeEight extends Application { val inputString = """BZh91AY&amp;SYA\xaf\x82\r\x00\x00\x01\x01\x80\x02\xc0\x02\x00 \x00!\x9ah3M\x07&lt;]\xc9\x14\xe1BA\x06\xbe\x084""" val inputStream = new ByteArrayInputStream( inputString.getBytes("UTF-8") ) //convert string to inputstream inputStream.skip(2) //skip the 'BZ' part at the start val bzipInputStream = new CBZip2InputStream(inputStream) //hangs here.... val result = IOUtils.toString(bzipInputStream, "UTF-8"); println(result) } </code></pre> <p>Anyone got any ideas? Or is the <code>CBZip2InputStream</code> class expecting some extra bytes that you might find in a file that has been zipped with <code>bzip2</code>?</p> <p>Any help would be appreciated</p> <p><strong>EDIT</strong> For the record this is the python solution</p> <pre><code>import bz2 un = "BZh91AY&amp;SYA\xaf\x82\r\x00\x00\x01\x01\x80\x02\xc0\x02\x00 \x00!" \ "\x9ah3M\x07&lt;]\xc9\x14\xe1BA\x06\xbe\x084" print [bz2.decompress(elt) for elt in (un)] </code></pre>
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    1. COMy standard behavior in such circumstances: Ctrl+F8, Shift+F9, F7, F7, F7, F7.... down to singularity point :)
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