1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
2 /* libwpd
3 * Version: MPL 2.0 / LGPLv2.1+
4 *
5 * This Source Code Form is subject to the terms of the Mozilla Public
6 * License, v. 2.0. If a copy of the MPL was not distributed with this
7 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 *
9 * Major Contributor(s):
10 * Copyright (C) 2004 Marc Maurer (uwog@uwog.net)
11 * Copyright (C) 2006 Fridrich Strba (fridrich.strba@bluewin.ch)
12 *
13 * For minor contributions see the git repository.
14 *
15 * Alternatively, the contents of this file may be used under the terms
16 * of the GNU Lesser General Public License Version 2.1 or later
17 * (LGPLv2.1+), in which case the provisions of the LGPLv2.1+ are
18 * applicable instead of those above.
19 *
20 * For further information visit http://libwpd.sourceforge.net
21 */
22
23 /* "This product is not manufactured, approved, or supported by
24 * Corel Corporation or Corel Corporation Limited."
25 */
26
27 #include "WP3FixedLengthGroup.h"
28 #include "WP3FileStructure.h"
29 #include "WP3AttributeGroup.h"
30 #include "WP3UnsupportedFixedLengthGroup.h"
31 #include "WP3ExtendedCharacterGroup.h"
32 #include "WP3DoubleByteScriptCharacterGroup.h"
33 #include "WP3TabGroup.h"
34 #include "WP3IndentGroup.h"
35 #include "WP3UndoGroup.h"
36 #include "libwpd_internal.h"
37
WP3FixedLengthGroup(const unsigned char groupID)38 WP3FixedLengthGroup::WP3FixedLengthGroup(const unsigned char groupID)
39 : m_group(groupID)
40 {
41 }
42
constructFixedLengthGroup(librevenge::RVNGInputStream * input,WPXEncryption * encryption,const unsigned char groupID)43 WP3FixedLengthGroup *WP3FixedLengthGroup::constructFixedLengthGroup(librevenge::RVNGInputStream *input, WPXEncryption *encryption, const unsigned char groupID)
44 {
45 switch (groupID)
46 {
47 case WP3_EXTENDED_CHARACTER_GROUP:
48 return new WP3ExtendedCharacterGroup(input, encryption, groupID);
49
50 case WP3_TAB_GROUP:
51 return new WP3TabGroup(input, encryption, groupID);
52
53 case WP3_INDENT_GROUP:
54 return new WP3IndentGroup(input, encryption, groupID);
55
56 case WP3_UNDO_GROUP:
57 return new WP3UndoGroup(input, encryption, groupID);
58
59 case WP3_ATTRIBUTE_GROUP:
60 return new WP3AttributeGroup(input, encryption, groupID);
61
62 case WP3_DOUBLE_BYTE_SCRIPT_CHARACTER_GROUP:
63 return new WP3DoubleByteScriptCharacterGroup(input, encryption, groupID);
64
65 // Add the remaining cases here
66 default:
67 return new WP3UnsupportedFixedLengthGroup(input, encryption, groupID);
68 }
69 }
70
isGroupConsistent(librevenge::RVNGInputStream * input,WPXEncryption * encryption,const unsigned char groupID)71 bool WP3FixedLengthGroup::isGroupConsistent(librevenge::RVNGInputStream *input, WPXEncryption *encryption, const unsigned char groupID)
72 {
73 long startPosition = input->tell();
74
75 try
76 {
77 int size = WP3_FIXED_LENGTH_FUNCTION_GROUP_SIZE[groupID-0xC0];
78 if (input->seek((startPosition + size - 2), librevenge::RVNG_SEEK_SET) || input->isEnd())
79 {
80 input->seek(startPosition, librevenge::RVNG_SEEK_SET);
81 return false;
82 }
83 if (groupID != readU8(input, encryption))
84 {
85 input->seek(startPosition, librevenge::RVNG_SEEK_SET);
86 return false;
87 }
88
89 input->seek(startPosition, librevenge::RVNG_SEEK_SET);
90 return true;
91 }
92 catch (...)
93 {
94 input->seek(startPosition, librevenge::RVNG_SEEK_SET);
95 return false;
96 }
97 }
98
_read(librevenge::RVNGInputStream * input,WPXEncryption * encryption)99 void WP3FixedLengthGroup::_read(librevenge::RVNGInputStream *input, WPXEncryption *encryption)
100 {
101 long startPosition = input->tell();
102 _readContents(input, encryption);
103
104 if (m_group >= 0xC0 && m_group <= 0xCF) // just an extra safety check
105 {
106 int size = WP3_FIXED_LENGTH_FUNCTION_GROUP_SIZE[m_group-0xC0];
107 input->seek((startPosition + size - 2), librevenge::RVNG_SEEK_SET);
108 if (m_group != readU8(input, encryption))
109 {
110 WPD_DEBUG_MSG(("WordPerfect: Possible corruption detected. Bailing out!\n"));
111 throw FileException();
112 }
113 }
114 else
115 throw FileException();
116 }
117 /* vim:set shiftwidth=4 softtabstop=4 noexpandtab: */
118