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diff --git a/src/parameterizedHeaderField.hpp b/src/parameterizedHeaderField.hpp
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+++ b/src/parameterizedHeaderField.hpp
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+//
+// VMime library (http://vmime.sourceforge.net)
+// Copyright (C) 2002-2004 Vincent Richard <[email protected]>
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of
+// the License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+//
+
+#ifndef VMIME_PARAMETERIZEDHEADERFIELD_HPP_INCLUDED
+#define VMIME_PARAMETERIZEDHEADERFIELD_HPP_INCLUDED
+
+
+#include "base.hpp"
+#include "headerFieldFactory.hpp"
+#include "parameter.hpp"
+#include "exception.hpp"
+#include "parameterFactory.hpp"
+
+
+namespace vmime
+{
+
+
+class parameterizedHeaderField : public headerField
+{
+	friend class headerFieldFactory::registerer <parameterizedHeaderField>;
+
+protected:
+
+	parameterizedHeaderField();
+
+public:
+
+	void copyFrom(const headerField& field);
+
+	// A sub-class for parameter manipulation
+	class paramsContainer
+	{
+		friend class parameterizedHeaderField;
+
+	protected:
+
+		~paramsContainer();
+
+	public:
+
+		// Find the first parameter with the specified name. If no parameter
+		// is found, an exception is thrown.
+		parameter& find(const string& name) const;
+
+		// Find the first parameter with the specified name
+		parameter& get(const string& name);
+
+		// Parameter iterator
+		class const_iterator;
+
+		class iterator
+		{
+			friend class parameterizedHeaderField::paramsContainer::const_iterator;
+			friend class parameterizedHeaderField::paramsContainer;
+
+		public:
+
+			typedef std::vector <parameter*>::iterator::difference_type difference_type;
+
+			iterator(std::vector <parameter*>::iterator it) : m_iterator(it) { }
+			iterator(const iterator& it) : m_iterator(it.m_iterator) { }
+
+			iterator& operator=(const iterator& it) { m_iterator = it.m_iterator; return (*this); }
+
+			parameter& operator*() const { return (**m_iterator); }
+			parameter* operator->() const { return (*m_iterator); }
+
+			iterator& operator++() { ++m_iterator; return (*this); }
+			iterator operator++(int) { iterator i(*this); ++m_iterator; return (i); }
+
+			iterator& operator--() { --m_iterator; return (*this); }
+			iterator operator--(int) { iterator i(*this); --m_iterator; return (i); }
+
+			iterator& operator+=(difference_type n) { m_iterator += n; return (*this); }
+			iterator& operator-=(difference_type n) { m_iterator -= n; return (*this); }
+
+			iterator operator-(difference_type x) const { return iterator(m_iterator - x); }
+
+			parameter& operator[](difference_type n) const { return *(m_iterator[n]); }
+
+			const bool operator==(const iterator& it) const { return (it.m_iterator == m_iterator); }
+			const bool operator!=(const iterator& it) const { return (!(*this == it)); }
+
+		protected:
+
+			std::vector <parameter*>::iterator m_iterator;
+		};
+
+		class const_iterator
+		{
+		public:
+
+			typedef std::vector <parameter*>::const_iterator::difference_type difference_type;
+
+			const_iterator(std::vector <parameter*>::const_iterator it) : m_iterator(it) { }
+			const_iterator(const iterator& it) : m_iterator(it.m_iterator) { }
+			const_iterator(const const_iterator& it) : m_iterator(it.m_iterator) { }
+
+			const_iterator& operator=(const const_iterator& it) { m_iterator = it.m_iterator; return (*this); }
+			const_iterator& operator=(const iterator& it) { m_iterator = it.m_iterator; return (*this); }
+
+			const parameter& operator*() const { return (**m_iterator); }
+			const parameter* operator->() const { return (*m_iterator); }
+
+			const_iterator& operator++() { ++m_iterator; return (*this); }
+			const_iterator operator++(int) { const_iterator i(*this); ++m_iterator; return (i); }
+
+			const_iterator& operator--() { --m_iterator; return (*this); }
+			const_iterator operator--(int) { const_iterator i(*this); --m_iterator; return (i); }
+
+			const_iterator& operator+=(difference_type n) { m_iterator += n; return (*this); }
+			const_iterator& operator-=(difference_type n) { m_iterator -= n; return (*this); }
+
+			const_iterator operator-(difference_type x) const { return const_iterator(m_iterator - x); }
+
+			const parameter& operator[](difference_type n) const { return *(m_iterator[n]); }
+
+			const bool operator==(const const_iterator& it) const { return (it.m_iterator == m_iterator); }
+			const bool operator!=(const const_iterator& it) const { return (!(*this == it)); }
+
+		protected:
+
+			std::vector <parameter*>::const_iterator m_iterator;
+		};
+
+	public:
+
+		iterator begin() { return (m_params.begin()); }
+		iterator end() { return (m_params.end()); }
+
+		const_iterator begin() const { return (const_iterator(m_params.begin())); }
+		const_iterator end() const { return (const_iterator(m_params.end())); }
+
+		// Parameter insertion
+		void append(const parameter& param);
+		void insert(const iterator it, const parameter& param);
+
+		// Parameter removing
+		void remove(const iterator it);
+		void clear();
+
+		// Parameter count
+		const size_t count() const { return (m_params.size()); }
+		const size_t size() const { return (m_params.size()); }
+
+		parameter& front() { return (*m_params.front()); }
+		const parameter& front() const { return (*m_params.front()); }
+		parameter& back() { return (*m_params.back()); }
+		const parameter& back() const { return (*m_params.back()); }
+
+	protected:
+
+		std::vector <parameter*> m_params;
+
+	} parameters;
+
+	typedef paramsContainer::iterator iterator;
+	typedef paramsContainer::const_iterator const_iterator;
+
+protected:
+
+	std::vector <parameter*> m_params;
+
+protected:
+
+	virtual void parseValue(const string& buffer, const string::size_type position, const string::size_type end) = 0;
+	virtual const string generateValue() const = 0;
+
+public:
+
+	using headerField::parse;
+	using headerField::generate;
+
+	// No need to override these (use "parseValue" and "generateValue" instead).
+	// For more information, see "defaultParameter.hpp".
+	void parse(const string& buffer, const string::size_type position, const string::size_type end, string::size_type* newPosition = NULL);
+	void generate(utility::outputStream& os, const string::size_type maxLineLength = lineLengthLimits::infinite, const string::size_type curLinePos = 0, string::size_type* newLinePos = NULL) const;
+};
+
+
+} // vmime
+
+
+#endif // VMIME_PARAMETERIZEDHEADERFIELD_HPP_INCLUDED