Bug 90521 [Import/Export] NumberFormatException during import zip file
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/datatransfer/TarInputStream.java
calculatedChecksum = headerChecksum(header);
		return (fileChecksum == calculatedChecksum);
	}
	/**
	 * Returns the next entry in the tar file.  Does not handle
	 * GNU @LongLink extensions.
	 * 
	 * @return the next entry in the tar file
	 * @throws TarException
	 * @throws IOException
	 */
	TarEntry getNextEntryInternal() throws TarException, IOException {
		byte[] header = new byte[512];
		int pos = 0;
		int i;
		if(firstEntry != null) {
			TarEntry entryReturn = firstEntry;
			firstEntry = null;
			return entryReturn;
		}
		while(nextEntry > 0) {
			long ret = in.skip(nextEntry);
			if(ret < 0) {
				throw new IOException("early end of stream"); 
			}
			nextEntry -= ret;
			bytesread += ret;
		}
		int bytestoread = 512;
		while(bytestoread > 0) {