//
// VMime library (http://www.vmime.org)
// Copyright (C) 2002 Vincent Richard <vincent@vmime.org>
//
// 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 3 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.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// Linking this library statically or dynamically with other modules is making
// a combined work based on this library.  Thus, the terms and conditions of
// the GNU General Public License cover the whole combination.
//

#include "vmime/utility/inputStreamByteBufferAdapter.hpp"


namespace vmime {
namespace utility {


inputStreamByteBufferAdapter::inputStreamByteBufferAdapter(const byte_t* buffer, const size_t length)
	: m_buffer(buffer),
	  m_length(length),
	  m_pos(0) {

}


bool inputStreamByteBufferAdapter::eof() const {

	return m_pos >= m_length;
}


void inputStreamByteBufferAdapter::reset() {

	m_pos = 0;
}


size_t inputStreamByteBufferAdapter::read(byte_t* const data, const size_t count) {

	const size_t remaining = m_length - m_pos;

	if (remaining < count) {

		std::copy(m_buffer + m_pos, m_buffer + m_pos + remaining, data);
		m_pos += remaining;

		return remaining;

	} else {

		std::copy(m_buffer + m_pos, m_buffer + m_pos + count, data);
		m_pos += count;

		return count;
	}
}


size_t inputStreamByteBufferAdapter::skip(const size_t count) {

	const size_t remaining = m_length - m_pos;

	if (remaining < count) {

		m_pos += remaining;
		return remaining;

	} else {

		m_pos += count;
		return count;
	}
}


size_t inputStreamByteBufferAdapter::getPosition() const {

	return m_pos;
}


void inputStreamByteBufferAdapter::seek(const size_t pos) {

	if (pos <= m_length) {
		m_pos = pos;
	}
}


} // utility
} // vmime