// lines 77 through 91
    private void init() {
        for(Enumeration<JarEntry> jarEntries = jarFile.entries();
            jarEntries.hasMoreElements();) {
            JarEntry jarEntry = jarEntries.nextElement();
            if(jarEntry.isDirectory()) {
                continue;
            }
            String jarEntryName = jarEntry.getName();
            if (relativeRootPath==null) {
                entries.add(jarEntryName);
            } else if (jarEntryName.startsWith(relativeRootPath)) {
                entries.add(jarEntryName.substring(relativeRootPath.length())); // <-- too eager
            }
        }
    }

// lines 97 through 101
    public InputStream getEntry(String entryPath) throws IOException {
        InputStream is = entries.contains(entryPath) ?
            jarFile.getInputStream(jarFile.getEntry(relativeRootPath + entryPath)) : null; // <-- or this needs to add separator "/" back
        return is;
    }