/* -*- 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 "WP1VariableLengthGroup.h"
#include "WP1UnsupportedVariableLengthGroup.h"
#include "WP1SetTabsGroup.h"
#include "WP1HeaderFooterGroup.h"
#include "WP1FootnoteEndnoteGroup.h"
#include "WP1PictureGroup.h"
#include "WP1FileStructure.h"
#include "libwpd_internal.h"
#include <limits>
WP1VariableLengthGroup::WP1VariableLengthGroup(unsigned char group) :
m_group(group),
m_size(0)
{
}
WP1VariableLengthGroup *WP1VariableLengthGroup::constructVariableLengthGroup(librevenge::RVNGInputStream *input, WPXEncryption *encryption, unsigned char group)
{
switch (group)
{
case WP1_SET_TABS_GROUP:
return new WP1SetTabsGroup(input, encryption, group);
case WP1_HEADER_FOOTER_GROUP:
return new WP1HeaderFooterGroup(input, encryption, group);
case WP1_FOOTNOTE_ENDNOTE_GROUP:
return new WP1FootnoteEndnoteGroup(input, encryption, group);
case WP1_PICTURE_GROUP:
return new WP1PictureGroup(input, encryption, group);
default:
// this is an unhandled group, just skip it
return new WP1UnsupportedVariableLengthGroup(input, encryption, group);
}
}
bool WP1VariableLengthGroup::isGroupConsistent(librevenge::RVNGInputStream *input, WPXEncryption *encryption, const unsigned char group)
{
long startPosition = input->tell();
if (startPosition < 0)
throw FileException();
try
{
unsigned size = readU32(input, encryption, true);
if (size > ((std::numeric_limits<unsigned>::max)() / 2))
return false;
if (input->seek(size, librevenge::RVNG_SEEK_CUR) || input->isEnd())
{
input->seek(startPosition, librevenge::RVNG_SEEK_SET);
return false;
}
if (size != readU32(input, encryption, true))
{
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 WP1VariableLengthGroup::_read(librevenge::RVNGInputStream *input, WPXEncryption *encryption)
{
long startPosition = input->tell();
if (startPosition < 0)
throw FileException();
WPD_DEBUG_MSG(("WordPerfect: handling a variable length group\n"));
m_size = readU32(input, encryption, true); // the length is the number of data bytes minus 4 (ie. the function codes)
if ((long)(m_size + startPosition) < startPosition)
throw FileException();
WPD_DEBUG_MSG(("WordPerfect: Read variable group header (start_position: %li, size: %u)\n", startPosition, m_size));
_readContents(input, encryption);
if ((m_size + (unsigned long)startPosition + 4 < m_size + (unsigned long)startPosition) ||
(m_size + (unsigned long)startPosition + 4) > ((std::numeric_limits<unsigned>::max)() / 2))
throw FileException();
input->seek(startPosition + m_size + 4, librevenge::RVNG_SEEK_SET);
if (m_size != readU32(input, encryption, true))
{
WPD_DEBUG_MSG(("WordPerfect: Possible corruption detected. Bailing out!\n"));
throw FileException();
}
if (m_group != readU8(input, encryption))
{
WPD_DEBUG_MSG(("WordPerfect: Possible corruption detected. Bailing out!\n"));
throw FileException();
}
if ((m_size + (unsigned long)startPosition + 9 < m_size + (unsigned long)startPosition) ||
(m_size + (unsigned long)startPosition + 9) > ((std::numeric_limits<unsigned>::max)() / 2))
throw FileException();
input->seek(startPosition + m_size + 9, librevenge::RVNG_SEEK_SET);
}
/* vim:set shiftwidth=4 softtabstop=4 noexpandtab: */