[COMPRESS-505] Multiple Reads of One SevenZArchiveEntry Fails - ASF JIRA

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Details

Type: Bug
Status: Closed
Priority: Minor
Resolution: Fixed
Affects Version/s: 1.20
Fix Version/s: 1.21
Component/s: None
Labels:
None

Description

I've run into a bug which occurs when attempting to read the same SevenZArchiveEntry stream multiple times. The following code illustrates the problem.

File archive = new File("CC0 Images.7z");
char[] password = "password".toCharArray();
try (SevenZFile f = new SevenZFile(archive, password))
{
  SevenZArchiveEntry entry = StreamSupport.stream(f.getEntries().spliterator(), false)
    .filter(e -> "alberta-amazing-attraction-banff-417074.jpg".equals(e.getName()))
    .findFirst().orElseGet(null);
  assert entry != null;
  for (int i = 0; i < 100; i++)
  {
    InputStream is = f.getInputStream(entry);
    BufferedImage img = ImageIO.read(is);
    assert img != null;
    System.out.println("Succeeded " + (i + 1) + " times");
  }
}

Below is the output I receive on version 1.20

Succeeded 1 times
Succeeded 2 times
Exception in thread "main" java.io.IOException: Checksum verification failed
    at org.apache.commons.compress.utils.ChecksumVerifyingInputStream.read(ChecksumVerifyingInputStream.java:61)
    at org.apache.commons.compress.utils.ChecksumVerifyingInputStream.skip(ChecksumVerifyingInputStream.java:102)
    at org.apache.commons.compress.utils.IOUtils.skip(IOUtils.java:113)
    at org.apache.commons.compress.archivers.sevenz.SevenZFile.getCurrentStream(SevenZFile.java:1318)
    at org.apache.commons.compress.archivers.sevenz.SevenZFile.getInputStream(SevenZFile.java:1354)
    at org.abitoff.dmav.Test.main(Test.java:11)