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From "Valentin Brandl (JIRA)" <j...@apache.org>
Subject [jira] [Created] (COMPRESS-439) Compressing and decompressing using Pack200 does not produce the original input
Date Wed, 10 Jan 2018 11:52:01 GMT
Valentin Brandl created COMPRESS-439:
----------------------------------------

             Summary: Compressing and decompressing using Pack200 does not produce the original
input
                 Key: COMPRESS-439
                 URL: https://issues.apache.org/jira/browse/COMPRESS-439
             Project: Commons Compress
          Issue Type: Bug
          Components: Compressors
    Affects Versions: 1.14
         Environment: Windows 7;
# java -version
java version "1.8.0_151"
Java(TM) SE Runtime Environment (build 1.8.0_151-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.151-b12, mixed mode)
            Reporter: Valentin Brandl
         Attachments: Test.java

I just tested different compressors using [JUnitQuickcheck](https://github.com/pholser/junit-quickcheck).
The tests should compress and then decompress some input and the result should be equal to
the input.
For gzip, bzip2, deflate and xz, this works as intended but pack200 seems to have some problems.
I will attach the testcase I wrote.
It seems that for empty input, the result won't be empty.

Test output:
```
input.length = 0
input = []
compressed.length = 19
compressed = [-54, -2, -48, 13, 7, -106, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 3, 45, 0]
decompressed.length = 29
decompressed = [80, 75, 5, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 0, 80, 65,
67, 75, 50, 48, 48]
```



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