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From "yiang li (Jira)" <j...@apache.org>
Subject [jira] [Created] (COMPRESS-496) SevenZFile.read got an exception when extracting empty file
Date Fri, 18 Oct 2019 08:39:00 GMT
yiang li created COMPRESS-496:
---------------------------------

             Summary: SevenZFile.read got an exception when extracting empty file
                 Key: COMPRESS-496
                 URL: https://issues.apache.org/jira/browse/COMPRESS-496
             Project: Commons Compress
          Issue Type: Bug
            Reporter: yiang li


{color:#FF0000}{color}When extracting an empty file in SevenZFile, an exception will be
thrown. This is because the `deferredBlockStreams` in SevenZFile was clear here

```

if (folderIndex < 0) {
 deferredBlockStreams.clear();
 // TODO: previously it'd return an empty stream?
 // new BoundedInputStream(new ByteArrayInputStream(new byte[0]), 0);
 return;
}

```

Maybe an empty stream should be added to deferredBlockStreams here as the TODO said?

 

Code to reproduce the exception

```

byte[] buffer = new byte[4096];
String destination = "/output/dir/of/7z";
SevenZFile sevenZFile = new SevenZFile(new File("/file/to/extract.7z"));
SevenZArchiveEntry entry;
while ((entry = sevenZFile.getNextEntry()) != null){
 if (entry.isDirectory()){
 continue;
 }
 File curfile = new File(destination, entry.getName());
 File parent = curfile.getParentFile();
 if (!parent.exists()) {
 parent.mkdirs();
 }
 FileOutputStream out = new FileOutputStream(curfile);

 while(sevenZFile.read(buffer, 0, buffer.length) > 0) {
 out.write(buffer);
 out.close();
 }
}

```



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