/* -*- 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) 2004-2006 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 "WP5FixedLengthGroup.h"

#include "WP5FileStructure.h"

#include "WP5AttributeGroup.h"

#include "WP5ExtendedCharacterGroup.h"

#include "WP5TabGroup.h"

#include "WP5IndentGroup.h"

#include "WP5UnsupportedFixedLengthGroup.h"

#include "libwpd_internal.h"

WP5FixedLengthGroup::WP5FixedLengthGroup(const unsigned char groupID):

  m_group(groupID)

{

}

WP5FixedLengthGroup *WP5FixedLengthGroup::constructFixedLengthGroup(librevenge::RVNGInputStream *input, WPXEncryption *encryption, const unsigned char groupID)

{

  switch (groupID)

  {

  case WP5_TOP_EXTENDED_CHARACTER:

    return new WP5ExtendedCharacterGroup(input, encryption, groupID);

  case WP5_TOP_TAB_GROUP:

    return new WP5TabGroup(input, encryption, groupID);

  case WP5_TOP_INDENT_GROUP:

    return new WP5IndentGroup(input, encryption, groupID);

  case WP5_TOP_ATTRIBUTE_ON:

    return new WP5AttributeOnGroup(input, encryption, groupID);

  case WP5_TOP_ATTRIBUTE_OFF:

    return new WP5AttributeOffGroup(input, encryption, groupID);

  // Add the remaining cases here

  default:

    return new WP5UnsupportedFixedLengthGroup(input, encryption, groupID);

  }

}

bool WP5FixedLengthGroup::isGroupConsistent(librevenge::RVNGInputStream *input, WPXEncryption *encryption, const unsigned char groupID)

{

  long startPosition = input->tell();

  try

  {

    int size = WP5_FIXED_LENGTH_FUNCTION_GROUP_SIZE[groupID-0xC0];

    if (input->seek((startPosition + size - 2), librevenge::RVNG_SEEK_SET) || input->isEnd())

    {

      input->seek(startPosition, librevenge::RVNG_SEEK_SET);

      return false;

    }

    if (groupID != readU8(input, encryption))

    {

      input->seek(startPosition, librevenge::RVNG_SEEK_SET);

      return false;

    }

    input->seek(startPosition, librevenge::RVNG_SEEK_SET);

    return true;

  }

  catch (...)

  {

    input->seek(startPosition, librevenge::RVNG_SEEK_SET);

    return false;

  }

}

void WP5FixedLengthGroup::_read(librevenge::RVNGInputStream *input, WPXEncryption *encryption)

{

  long startPosition = input->tell();

  _readContents(input, encryption);

  if (m_group >= 0xC0 && m_group <= 0xCF) // just an extra safety check

  {

    int size = WP5_FIXED_LENGTH_FUNCTION_GROUP_SIZE[m_group-0xC0];

    input->seek((startPosition + size - 2), librevenge::RVNG_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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