Problems with BZIP-OutputStream

Question

first some code:

ByteArrayOutputStream bos = new ByteArrayOutputStream();
CBZip2OutputStream zos = new CBZip2OutputStream(bos);

provider.sendXMLFilelist(zos);
zos.flush();
bos.flush();

length = bos.size();

"provider" send (lets say) 200 bytes to "zos". But length is == 1. I know bzip is good, but 1 byte seems a litte less.

When I do: provider.sendXMLFilelist(bos); than length is == 200.

Why doesn't CBZip2OutputStream output all of his compressed bytes?

I'm using this implementation: http://www.kohsuke.org/bzip2/

score 2 · Accepted Answer · answered Dec 06 '10 at 16:29

2

I think i now have the answer. you have to .close() the bzip2 stream. Bzip2 ist a block codec and it doesn't know if it has to pad the data or if there is more.

So by telling him to close the stream brings him to output all of its compressed data.

answered Dec 06 '10 at 16:29

Bigbohne

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It is a good practice to always close the streams, anyway my kudos :) – barti_ddu Dec 06 '10 at 20:00

score 0 · Answer 2 · answered Dec 05 '10 at 17:10

0

I've had issues with this library implementation in the past, I'd recommend you to look at another bzip2 implementation from Apache commons. Migration shouldn't be complex (replace CBZip2OutputStream -> BZip2CompressorOutputStream and you should go).

answered Dec 05 '10 at 17:10

barti_ddu

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Tried this. but my sollution finally leads to success. – Bigbohne Dec 06 '10 at 16:30

Problems with BZIP-OutputStream

2 Answers2