--- a/C++/ZipArchive.cpp	Tue Nov 11 14:04:36 2014 +0100
+++ b/C++/ZipArchive.cpp	Tue Nov 11 14:52:25 2014 +0100
@@ -69,7 +69,7 @@
 {
 	auto src = zip_source_file(archive, m_path.c_str(), m_start, m_length);
 
-	if (!src)
+	if (src == nullptr)
 		throw std::runtime_error(zip_strerror(archive));
 
 	return src;
@@ -246,3 +246,50 @@
 	if (zip_delete(m_handle.get(), index) < 0)
 		throw std::runtime_error(zip_strerror(m_handle.get()));
 }
+
+ZipInt64 ZipArchive::numEntries(ZipFlags flags) const
+{
+	return zip_get_num_entries(m_handle.get(), flags);
+}
+
+void ZipArchive::unchange(ZipUint64 index)
+{
+	if (zip_unchange(m_handle.get(), index) < 0)
+		throw std::runtime_error(zip_strerror(m_handle.get()));
+}
+
+void ZipArchive::unchangeAll()
+{
+	if (zip_unchange_all(m_handle.get()) < 0)
+		throw std::runtime_error(zip_strerror(m_handle.get()));
+}
+
+void ZipArchive::unchangeArchive()
+{
+	if (zip_unchange_archive(m_handle.get()) < 0)
+		throw std::runtime_error(zip_strerror(m_handle.get()));
+}
+
+void ZipArchive::setDefaultPassword(const std::string &password)
+{
+	auto cstr = (password.size() > 0) ? password.c_str() : nullptr;
+
+	if (zip_set_default_password(m_handle.get(), cstr) < 0)
+		throw std::runtime_error(zip_strerror(m_handle.get()));
+}
+
+void ZipArchive::setFlag(ZipFlags flags, int value)
+{
+	if (zip_set_archive_flag(m_handle.get(), flags, value) < 0)
+		throw std::runtime_error(zip_strerror(m_handle.get()));
+}
+
+int ZipArchive::getFlag(ZipFlags which, ZipFlags flags) const
+{
+	auto ret = zip_get_archive_flag(m_handle.get(), which, flags);
+
+	if (ret < 0)
+		throw std::runtime_error(zip_strerror(m_handle.get()));
+
+	return ret;
+}

--- a/C++/ZipArchive.h	Tue Nov 11 14:04:36 2014 +0100
+++ b/C++/ZipArchive.h	Tue Nov 11 14:52:25 2014 +0100
@@ -369,6 +369,56 @@
 	 * @param index the file index in the archive
 	 */
 	void remove(ZipUint64 index);
+
+	/**
+	 * Get the number of entries in the archive.
+	 *
+	 * @param flags the optional flags
+	 * @return the number of entries
+	 */
+	ZipInt64 numEntries(ZipFlags flags = 0) const;
+
+	/**
+	 * Revert changes on the file.
+	 *
+	 * @param index the index
+	 */
+	void unchange(ZipUint64 index);
+
+	/**
+	 * Revert all changes.
+	 */
+	void unchangeAll();
+
+	/**
+	 * Revert changes to archive.
+	 */
+	void unchangeArchive();
+
+	/**
+	 * Set the defaut password.
+	 *
+	 * @param password the password or empty to unset it
+	 */
+	void setDefaultPassword(const std::string &password = "");
+
+	/**
+	 * Set an archive flag.
+	 *
+	 * @param flag the flag to set
+	 * @param value the value
+	 */
+	void setFlag(ZipFlags flag, int value);
+
+	/**
+	 * Get an archive flag.
+	 *
+	 * @param which which flag
+	 * @param flags the optional flags
+	 * @return the value
+	 */
+	int getFlag(ZipFlags which, ZipFlags flags) const;
+
 };
 
 #endif // !_ZIP_ARCHIVE_H_