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16762218
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2013-05-26T18:09:24.967
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2013-05-26T18:39:46.340
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2013-05-26T18:39:46.340
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text
Body
You need to use the <code>nowrap</code> option of <code>Deflater</code> to produce a raw deflate stream with no headers or trailers. Then you will need to wrap that raw deflate stream with the appropriate zip headers and trailers yourself. To create a single deflate stream on multiple processors, you need to be able to flush the compressed output to a byte boundary (for the pieces that are not the last piece) using the <code>Z_SYNC_FLUSH</code> operation in <a href="http://zlib.net/" rel="nofollow">zlib</a>. (The last piece would be finished normally.) Then the pieces can be simply concatenated. The Java 7 (but not Java 6) <a href="http://docs.oracle.com/javase/7/docs/api/java/util/zip/Deflater.html" rel="nofollow">documentation</a> supports this with the optional fourth parameter of the <code>deflate()</code> method. That can be set to <code>SYNC_FLUSH</code>. Breaking up the data in this way will degrade compression, since each block cannot benefit from the history of the preceding block. This can be solved using the <code>setDictionary()</code> method. Provide to each thread both the data to compress as well as the 32K bytes of uncompressed data that precedes it. Then use the 32K with <code>setDictionary()</code>, followed by the <code>deflate()</code>. You can see <a href="http://zlib.net/pigz/" rel="nofollow">pigz</a> for an example of parallel compression in C using zlib directly. Once you have your deflate stream, you wrap it appropriately to make it a zip file. See the <a href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT" rel="nofollow">appnote for the zip file format</a>. You will also need to compute the <a href="http://docs.oracle.com/javase/7/docs/api/java/util/zip/CRC32.html" rel="nofollow">CRC-32</a> of the uncompressed data to be able to fill in those fields.
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1. POCompress file with zip algorithm in Java on multiple hosts
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1. USMark Adler
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1. USMark Adler
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