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https://issues.apache.org/jira/browse/COMPRESS-550?focusedWorklogId=473770&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-473770
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ASF GitHub Bot logged work on COMPRESS-550:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 24/Aug/20 07:45
Start Date: 24/Aug/20 07:45
Worklog Time Spent: 10m
Work Description: XenoAmess commented on pull request #127:
URL: https://github.com/apache/commons-compress/pull/127#issuecomment-678965962
> @dependabot rebase
@PeterAlfredLee 👍
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Issue Time Tracking
-------------------
Worklog Id: (was: 473770)
Time Spent: 1h (was: 50m)
> Support writing self-extracting preamble data to a zip archive
> --------------------------------------------------------------
>
> Key: COMPRESS-550
> URL: https://issues.apache.org/jira/browse/COMPRESS-550
> Project: Commons Compress
> Issue Type: New Feature
> Components: Archivers
> Affects Versions: 1.20
> Reporter: Scott Frederick
> Priority: Major
> Time Spent: 1h
> Remaining Estimate: 0h
>
> On Linux, it is possible to create a self-extracting zip file by prepending a
> script or other executable to the zip file. For example, this can be done
> from the command line with the following commands:
> {code:bash}
> $ echo "test file text" > test.txt
> $ zip test.zip test.txt
> adding: test.txt (stored 0%)
> $ cat /usr/bin/unzipsfx test.zip > test
> $ zipinfo test
> Archive: test
> Zip file size: 101568 bytes, number of entries: 1
> warning [test]: 101392 extra bytes at beginning or within zipfile
> (attempting to process anyway)
> -rw-r--r-- 3.0 unx 10 tx stor 20-Jul-30 15:43 test.txt
> 1 file, 10 bytes uncompressed, 10 bytes compressed: 0.0%
> $ zip --adjust-sfx test.zip
> Zip entry offsets appear off by 101392 bytes - correcting...
> $ zipinfo test
> Archive: test
> Zip file size: 101568 bytes, number of entries: 1
> -rw-r--r-- 3.0 unx 10 tx stor 20-Jul-30 15:43 test.txt
> 1 file, 10 bytes uncompressed, 10 bytes compressed: 0.0%
> $ chmod 755 test
> {code}
> Note that the first invocation of "zipinfo" reports that the central
> directory is invalid because of extra bytes at the beginning of the zip file.
> "zip --adjust-sfx" can be used to adjust the central directory to account for
> the self-extracting preamble bytes.
> It would be nice to be able to prepend this kind of self-extracting preamble
> to a zip using Apache Commons Compress.
> A method like the following on ZipArchiveOutputStream seems to provide this
> behavior:
> {code:java}
> public void writePreamble(byte[] preamble) throws IOException {
> if (entry != null) {
> throw new IllegalStateException("Preamble must be written before
> creating an entry");
> }
> this.streamCompressor.writeCounted(preamble);
> }
> {code}
>
>
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