private static boolean isSymlink(ArchiveEntry entry) {
        // Symlinks inside ZIP files are not part of the ZIP spec and are only supported by some implementations, such
        // as Info-ZIP.
        //
        // Commons Compress only has limited support for symlinks as they are only detected when the ZIP file is read
        // through org.apache.commons.compress.archivers.zip.ZipFile. This is not the case in this class, because it must
        // support reading ZIP files from generic input streams. The check below thus always returns false.
        if (entry instanceof ZipArchiveEntry zipEntry) return zipEntry.isUnixSymlink();
        if (entry instanceof TarArchiveEntry tarEntry) return tarEntry.isSymbolicLink();
        throw new IllegalArgumentException("Unsupported archive entry " + entry.getClass().getSimpleName() + ", cannot check for symbolic link");
    }
The decompressed size of this file
application-model/src/main/java/com/yahoo/vespa/archive/ArchiveStreamReader.java