GNU bug report logs - #37665
Concatenation of gzip compressed bytearray

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#37665: closed (Concatenation of gzip compressed bytearray)
Date: Tue, 08 Oct 2019 16:53:02 +0000

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Your message dated Tue, 8 Oct 2019 09:52:31 -0700
with message-id <427f9954-ace6-c8f1-d6ae-fa9cae019bd4 <at> cs.ucla.edu>
and subject line Re: bug#37665: Concatenation of gzip compressed bytearray
has caused the debbugs.gnu.org bug report #37665,
regarding Concatenation of gzip compressed bytearray
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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From: Zhu Li <zhu.andrew.li <at> gmail.com>
To: bug-gzip <at> gnu.org
Subject: Concatenation of gzip compressed bytearray
Date: Tue, 8 Oct 2019 10:28:49 -0500

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Hello there,

Our team has a use case where we want to concatenate gzip-compressed byte
arrays. We do compression with GZIPOutputStream.java with Java 8 and
decompression with GZIPInputStream.java.
In a simple test case I compressed several instances of byte[] with
GZIPOutputStream and output the compressed results to several instances of
byte[], and then put all of them into a ByteBuffer. Then I tried to
decompress the concatenated data in the final ByteBuffer with
GZIPInputStream.
And I found that sometimes this works as expected but other times the last
few instances of input byte[] are ignored by GZIPInputStream(it seems to
get EOF at the end of a compressed byte[], which is not the last compressed
byte[] in the ByteBuffer) I was testing with the default setting.
So does this mean that GZIPInputStream and GZIPOutputStream don't support
such operation by design or is there something we can configure/change for
this to work?

Regards,
Zhu

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Zhu Li <zhu.andrew.li <at> gmail.com>
Cc: 37665-done <at> debbugs.gnu.org
Subject: Re: bug#37665: Concatenation of gzip compressed bytearray
Date: Tue, 8 Oct 2019 09:52:31 -0700

On 10/8/19 8:28 AM, Zhu Li wrote:
> does this mean that GZIPInputStream and GZIPOutputStream don't support
> such operation by design

Sorry, but you seem to be writing about some gzip-compatible software, 
not about gzip itself. Please write to whoever maintains that other 
software, instead of to bug-gzip.

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