/* -*- 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) 2003 William Lachance (wrlach@gmail.com)
 * Copyright (C) 2003 Marc Maurer (uwog@uwog.net)
 * Copyright (C) 2006 Fridrich Strba (fridrich.strba@bluewin.ch)
 *
 * 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 "WP5Part.h"
#include "WP5VariableLengthGroup.h"
#include "WP5FixedLengthGroup.h"
#include "WP5SingleByteFunction.h"
#include "WP5Listener.h"

// constructPart: constructs a parseable low-level representation of part of the document
// returns the part if it successfully creates the part, returns 0 if it can't
// throws an exception if there is an error
// precondition: readVal is between 0xC0 and 0xFF
WP5Part *WP5Part::constructPart(librevenge::RVNGInputStream *input, WPXEncryption *encryption, const unsigned char readVal)
{
	WPD_DEBUG_MSG(("WordPerfect: ConstructPart\n"));

	if (readVal >= (unsigned char)0x80 && readVal <= (unsigned char)0xBF)
	{
		// single-byte function

		WPD_DEBUG_MSG(("WordPerfect: constructSingleByteFunction(input, val)\n"));
		return WP5SingleByteFunction::constructSingleByteFunction(input, encryption, readVal);
	}
	else if (readVal >= (unsigned char)0xC0 && readVal <= (unsigned char)0xCF)
	{
		// fixed length multi-byte function

		if (!WP5FixedLengthGroup::isGroupConsistent(input, encryption, readVal))
		{
			WPD_DEBUG_MSG(("WordPerfect: Consistency Check (fixed length) failed; ignoring this byte\n"));
			return nullptr;
		}
		WPD_DEBUG_MSG(("WordPerfect: constructFixedLengthGroup(input, val)\n"));
		return WP5FixedLengthGroup::constructFixedLengthGroup(input, encryption, readVal);
	}
	else if (readVal >= (unsigned char)0xD0)
	{
		// variable length multi-byte function

		/* check whether the function is consistent with the variable length
		 * function definition. If not, just skip the function byte and try next position.
		 * The documentation speaks about variable length functions from 0xD0 to 0xFF, but
		 * only 0xD0 to 0xDF, 0xE1 and 0xFE are documented. We saw in some documents that
		 * the 0xE8 function was a single byte undocumented function (or corruption???) */
		if (!WP5VariableLengthGroup::isGroupConsistent(input, encryption, readVal))
		{
			WPD_DEBUG_MSG(("WordPerfect: Consistency Check (variable length) failed; ignoring this byte\n"));
			return nullptr;
		}
		WPD_DEBUG_MSG(("WordPerfect: constructVariableLengthGroup(input, val)\n"));
		return WP5VariableLengthGroup::constructVariableLengthGroup(input, encryption, readVal);
	}


	WPD_DEBUG_MSG(("WordPerfect: Returning 0 from constructPart\n"));
	return nullptr;
}
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