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https://issues.apache.org/jira/browse/COMPRESS-505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17050990#comment-17050990
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Peter Alfred Lee commented on COMPRESS-505:
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This is a problem caused by the random access of 7z(which was published by me).
I'm working on this. I'll push a PR on github and update this issue.
> Multiple Reads of One SevenZArchiveEntry Fails
> ----------------------------------------------
>
> Key: COMPRESS-505
> URL: https://issues.apache.org/jira/browse/COMPRESS-505
> Project: Commons Compress
> Issue Type: Bug
> Affects Versions: 1.20
> Reporter: Steven Fontaine
> Priority: Minor
> Attachments: CC0 Images.7z
>
>
> I've run into a bug which occurs when attempting to read the same
> SevenZArchiveEntry stream multiple times. The following code illustrates the
> problem.
> {code:java}
> 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");
> }
> }{code}
> Below is the output I receive on version 1.20
> {code:java}
> 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)
> {code}
>
>
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