[GitHub] [commons-compress] garydgregory commented on pull request #368: COMPRESS-642 Integer overflow ArithmeticException in TarArchiveOutputStream

["garydgregory (via GitHub)" <gi...@apache.org>]

garydgregory commented on PR #368:
URL: https://github.com/apache/commons-compress/pull/368#issuecomment-1471944326

   > I wrote a test to reproduce the issue, writing to a `NullOutputStream`, but that turned out to be really slow due to the forced 512 bytes chunking. So I opted to not include that.
   > 
   > ```java
   >     @Test
   >     public void testWritingBigFile() throws Exception {
   >         final TarArchiveEntry t = new TarArchiveEntry("foo");
   >         t.setSize((Integer.MAX_VALUE + 1L) * TarConstants.DEFAULT_RCDSIZE);
   >         final TarArchiveOutputStream tos = new TarArchiveOutputStream(NullOutputStream.NULL_OUTPUT_STREAM);
   >         tos.setBigNumberMode(TarArchiveOutputStream.BIGNUMBER_POSIX);
   >         tos.putArchiveEntry(t);
   > 
   >         byte[] bytes = new byte[TarConstants.DEFAULT_RCDSIZE];
   >         for (int i = 0; i < Integer.MAX_VALUE; i++) {
   >             tos.write(bytes);
   >         }
   >         tos.closeArchiveEntry();
   >         tos.close();
   >     }
   > ```
   
   How slow?


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