Bug 90521 [Import/Export] NumberFormatException during import zip file
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/datatransfer/TarInputStream.java
nextEOF = 0;
		TarEntry foundEntry = getNextEntry();
		if(!foundEntry.getName().equals(entry.getName())) {
			throw new IOException("inconsistent file"); 
		}
		return true;
	}
	/**
	 * Returns true if the header checksum is correct.
	 * 
	 * @param header
	 * @return true if this header has a valid checksum
	 */
	private boolean isValidTarHeader(byte[] header) {
		long fileChecksum, calculatedChecksum;
		int pos, i;
		
		pos = 148;
		StringBuffer checksumString = new StringBuffer();
		for(i = 0; i < 8; i++) {
			if(header[pos + i] == 0 || !Character.isDigit((char) header[pos + i])) break;
			checksumString.append((char) header[pos + i]);
		}
		if(checksumString.length() == 0) return false;
		if(checksumString.charAt(0) != '0') checksumString.insert(0, '0');
		fileChecksum = Long.decode(checksumString.toString()).longValue();
		
		for(i = 0; i < 8; i++) {
			header[pos + i] = ' ';
		}