/* -*- 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) 2003-2004 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 "WP5PageFormatGroup.h"

#include "WP5VariableLengthGroup.h"

#include "WP5UnsupportedVariableLengthGroup.h"

#include "libwpd_internal.h"

#include "WP5HeaderFooterGroup.h"

#include "WP5FontGroup.h"

#include "WP5BoxGroup.h"

#include "WP5FootnoteEndnoteGroup.h"

#include "WP5DefinitionGroup.h"

#include "WP5TableEOLGroup.h"

#include "WP5TableEOPGroup.h"

WP5VariableLengthGroup::WP5VariableLengthGroup() :

  m_subGroup(0),

  m_size(0)

{

}

WP5VariableLengthGroup *WP5VariableLengthGroup::constructVariableLengthGroup(librevenge::RVNGInputStream *input, WPXEncryption *encryption, const unsigned char group)

{

  WPD_DEBUG_MSG(("WordPerfect: handling a variable length group Ox%x\n", group));

  switch (group)

  {

  case WP5_TOP_DEFINITION_GROUP:

    return new WP5DefinitionGroup(input, encryption);

  case WP5_TOP_PAGE_FORMAT_GROUP:

    return new WP5PageFormatGroup(input, encryption);

  case WP5_TOP_HEADER_FOOTER_GROUP:

    return new WP5HeaderFooterGroup(input, encryption);

  case WP5_TOP_FONT_GROUP:

    return new WP5FontGroup(input, encryption);

  case WP5_TOP_FOOTNOTE_ENDNOTE_GROUP:

    return new WP5FootnoteEndnoteGroup(input, encryption);

  case WP5_TOP_BOX_GROUP:

    return new WP5BoxGroup(input, encryption);

  case WP5_TOP_TABLE_EOL_GROUP:

    return new WP5TableEOLGroup(input, encryption);

  case WP5_TOP_TABLE_EOP_GROUP:

    return new WP5TableEOPGroup(input, encryption);

  default:

    // this is an unhandled group, just skip it

    return new WP5UnsupportedVariableLengthGroup(input, encryption);

  }

}

bool WP5VariableLengthGroup::isGroupConsistent(librevenge::RVNGInputStream *input, WPXEncryption *encryption, const unsigned char group)

{

  long startPosition = input->tell();

  try

  {

    unsigned char subGroup = readU8(input, encryption);

    unsigned short size = readU16(input, encryption);

    if (input->seek((startPosition + size - 1), librevenge::RVNG_SEEK_SET) || input->isEnd())

    {

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

      return false;

    }

    if (size != readU16(input, encryption))

    {

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

      return false;

    }

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

    {

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

      return false;

    }

    if (group != 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 WP5VariableLengthGroup::_read(librevenge::RVNGInputStream *input, WPXEncryption *encryption)

{

  long startPosition = input->tell();

  m_subGroup = readU8(input, encryption);

  m_size = (unsigned short)(readU16(input, encryption) + 4); // the length is the number of data bytes minus 4 (ie. the function codes)

  WPD_DEBUG_MSG(("WordPerfect: Read variable group header (start_position: %li, sub_group: 0x%2x, size: %u)\n", startPosition, m_subGroup, m_size));

  _readContents(input, encryption);

  input->seek((startPosition + m_size - 5), librevenge::RVNG_SEEK_SET);

  if (m_size != (readU16(input, encryption) + 4))

  {

    WPD_DEBUG_MSG(("WordPerfect: Possible corruption detected. Bailing out!\n"));

    throw FileException();

  }

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

  {

    WPD_DEBUG_MSG(("WordPerfect: Possible corruption detected. Bailing out!\n"));

    throw FileException();

  }

  input->seek((startPosition + m_size - 1), librevenge::RVNG_SEEK_SET);

}

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