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https://issues.apache.org/jira/browse/COMPRESS-540?focusedWorklogId=491944&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-491944
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ASF GitHub Bot logged work on COMPRESS-540:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 28/Sep/20 11:59
Start Date: 28/Sep/20 11:59
Worklog Time Spent: 10m
Work Description: PeterAlfredLee commented on pull request #113:
URL: https://github.com/apache/commons-compress/pull/113#issuecomment-699962152
IMO, it's OK to have a random access for Tar - even through it would be
slower as we read the `tar archive` to get the positions of entries. But I
think we should hear more voice from others about this idea, cause this is a
big change and `tar archives` are not designed to have a random access.
@theobisproject And as you said, there are still some work(e.g. the
refactor of the duplication) to do.
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Issue Time Tracking
-------------------
Worklog Id: (was: 491944)
Time Spent: 2h 40m (was: 2.5h)
> Random access on Tar archive
> ----------------------------
>
> Key: COMPRESS-540
> URL: https://issues.apache.org/jira/browse/COMPRESS-540
> Project: Commons Compress
> Issue Type: Improvement
> Reporter: Robin Schimpf
> Priority: Major
> Time Spent: 2h 40m
> Remaining Estimate: 0h
>
> The TarArchiveInputStream only provides sequential access. If only a small
> amount of files from the archive is needed large amount of data in the input
> stream needs to be skipped.
> Therefore I was working on a implementation to provide random access to
> TarFiles equal to the ZipFile api. The basic idea behind the implementation
> is the following
> * Random access is backed by a SeekableByteChannel
> * Read all headers of the tar file and save the place to the data of every
> header
> * User can request an input stream for any entry in the archive multiple
> times
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