/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/* libwpd
 * Copyright (C) 2003 William Lachance (wrlach@gmail.com)
 * Copyright (C) 2003 Marc Maurer (uwog@uwog.net)
 * Copyright (C) 2006 Fridrich Strba (fridrich.strba@bluewin.ch)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 *
 * For further information visit http://libwpd.sourceforge.net
 */

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

#include "WP1FixedLengthGroup.h"
#include "WP1SuppressPageCharacteristicsGroup.h"
#include "WP1UnsupportedFixedLengthGroup.h"
#include "WP1MarginResetGroup.h"
#include "WP1MarginReleaseGroup.h"
#include "WP1TopMarginGroup.h"
#include "WP1BottomMarginGroup.h"
#include "WP1ExtendedCharacterGroup.h"
#include "WP1PointSizeGroup.h"
#include "WP1LeftIndentGroup.h"
#include "WP1FontIdGroup.h"
#include "WP1LeftRightIndentGroup.h"
#include "WP1JustificationGroup.h"
#include "WP1SpacingResetGroup.h"
#include "WP1CenterTextGroup.h"
#include "WP1FlushRightGroup.h"
#include "WP1FileStructure.h"
#include "libwpd_internal.h"

WP1FixedLengthGroup::WP1FixedLengthGroup(uint8_t group)
	: m_group(group)
{
}

WP1FixedLengthGroup *WP1FixedLengthGroup::constructFixedLengthGroup(WPXInputStream *input, WPXEncryption *encryption, uint8_t group)
{
	switch (group)
	{
	case WP1_MARGIN_RESET_GROUP:
		return new WP1MarginResetGroup(input, encryption, group);
	case WP1_TOP_MARGIN_SET_GROUP:
		return new WP1TopMarginGroup(input, encryption, group);
	case WP1_BOTTOM_MARGIN_SET_GROUP:
		return new WP1BottomMarginGroup(input, encryption, group);
	case WP1_LEFT_INDENT_GROUP:
		return new WP1LeftIndentGroup(input, encryption, group);
	case WP1_SUPPRESS_PAGE_CHARACTERISTICS_GROUP:
		return new WP1SuppressPageCharacteristicsGroup(input, encryption, group);
	case WP1_LEFT_RIGHT_INDENT_GROUP:
		return new WP1LeftRightIndentGroup(input, encryption, group);
	case WP1_FONT_ID_GROUP:
		return new WP1FontIdGroup(input, encryption, group);
	case WP1_MARGIN_RELEASE_GROUP:
		return new WP1MarginReleaseGroup(input, encryption, group);
	case WP1_CENTER_TEXT_GROUP:
		return new WP1CenterTextGroup(input, encryption, group);
	case WP1_FLUSH_RIGHT_GROUP:
		return new WP1FlushRightGroup(input, encryption, group);
	case WP1_EXTENDED_CHARACTER_GROUP:
		return new WP1ExtendedCharacterGroup(input, encryption, group);
	case WP1_POINT_SIZE_GROUP:
		return new WP1PointSizeGroup(input, encryption, group);
	case WP1_JUSTIFICATION_GROUP:
		return new WP1JustificationGroup(input, encryption, group);
	case WP1_SPACING_RESET_GROUP:
		return new WP1SpacingResetGroup(input, encryption, group);
	default:
		// this is an unhandled group, just skip it
		return new WP1UnsupportedFixedLengthGroup(input, encryption, group);
	}
}

bool WP1FixedLengthGroup::isGroupConsistent(WPXInputStream *input, WPXEncryption *encryption, const uint8_t groupID)
{
	uint32_t startPosition = input->tell();

	try
	{
		int size = WP1_FUNCTION_GROUP_SIZE[groupID-0xC0];
		if (input->seek((startPosition + size - 2), WPX_SEEK_SET) || input->atEOS())
		{
			input->seek(startPosition, WPX_SEEK_SET);
			return false;
		}
		if (groupID != readU8(input, encryption))
		{
			input->seek(startPosition, WPX_SEEK_SET);
			return false;
		}

		input->seek(startPosition, WPX_SEEK_SET);
		return true;
	}
	catch(...)
	{
		input->seek(startPosition, WPX_SEEK_SET);
		return false;
	}
}

void WP1FixedLengthGroup::_read(WPXInputStream *input, WPXEncryption *encryption)
{
	uint32_t startPosition = input->tell();

	if (m_group >= 0xC0 && m_group <= 0xFE) // just an extra safety check
	{
		int size = WP1_FUNCTION_GROUP_SIZE[m_group-0xC0];
		if (size == -1)
			return;

		_readContents(input, encryption);

		input->seek((startPosition + size - 2), WPX_SEEK_SET);
		if (m_group != readU8(input, encryption))
		{
			WPD_DEBUG_MSG(("WordPerfect: Possible corruption detected. Bailing out!\n"));
			throw FileException();
		}
	}
	else
		throw FileException();
}
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