/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/* libwpd
 * Version: MPL 2.0 / LGPLv2.1+
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * Major Contributor(s):
 * Copyright (C) 2002 William Lachance (wrlach@gmail.com)
 * Copyright (C) 2002 Marc Maurer (uwog@uwog.net)
 *
 * For minor contributions see the git repository.
 *
 * Alternatively, the contents of this file may be used under the terms
 * of the GNU Lesser General Public License Version 2.1 or later
 * (LGPLv2.1+), in which case the provisions of the LGPLv2.1+ are
 * applicable instead of those above.
 *
 * For further information visit http://libwpd.sourceforge.net
 */

/* "This product is not manufactured, approved, or supported by
 * Corel Corporation or Corel Corporation Limited."
 */

#include "WP60Header.h"
#include "WP6FileStructure.h"
#include "libwpd_internal.h"

WP6Header::WP6Header(librevenge::RVNGInputStream *input, WPXEncryption *encryption, unsigned documentOffset, unsigned char productType,
                     unsigned char fileType, unsigned char majorVersion, unsigned char minorVersion, unsigned short documentEncryption) :
	WPXHeader(input, encryption, documentOffset, productType, fileType, majorVersion, minorVersion, documentEncryption),
	m_indexHeaderOffset(0),
	m_numPrefixIndices(0)
{
	input->seek(WP6_HEADER_INDEX_HEADER_POINTER_OFFSET, librevenge::RVNG_SEEK_SET);
	m_indexHeaderOffset = readU16(input, encryption);

	// according to the WP6.0 specs, if the index header offset variable is less than 16, it is 16
	// ASSUMPTION: this also goes for WP6.1
	if (m_indexHeaderOffset < 16)
		m_indexHeaderOffset = 16;

	// FIXME: we do not handle encrypted documents
	if (getDocumentEncryption() != 0)
		throw UnsupportedEncryptionException();

	WPD_DEBUG_MSG(("WordPerfect: Index Header Position = 0x%x \n",(int)m_indexHeaderOffset));
}

void WP6Header::_readIndexInformation(librevenge::RVNGInputStream *input, WPXEncryption *encryption)
{
	// read the Index Header (Header #0)
	// skip the Flags = 2 and the Reserved byte = 0
	input->seek(m_indexHeaderOffset + WP6_INDEX_HEADER_NUM_INDICES_POSITION, librevenge::RVNG_SEEK_SET);
	m_numPrefixIndices = readU16(input, encryption);

	// ignore the 10 reserved bytes that follow (jump to the offset of the Index Header #1, where we can resume parsing)
	input->seek(m_indexHeaderOffset + WP6_INDEX_HEADER_INDICES_POSITION, librevenge::RVNG_SEEK_SET);
}
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