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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