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76ee07f61c
Co-authored-by: Alexander Trofimov <alexander.trofimov@onlyoffice.com> Co-committed-by: Alexander Trofimov <alexander.trofimov@onlyoffice.com>
125 lines
4.1 KiB
C++
125 lines
4.1 KiB
C++
/*
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* Copyright (C) Ascensio System SIA, 2009-2026
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*
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* This program is a free software product. You can redistribute it and/or
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* modify it under the terms of the GNU Affero General Public License (AGPL)
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* version 3 as published by the Free Software Foundation, together with the
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* additional terms provided in the LICENSE file.
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*
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* This program is distributed WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For
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* details, see the GNU AGPL at: https://www.gnu.org/licenses/agpl-3.0.html
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*
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* You can contact Ascensio System SIA by email at info@onlyoffice.com
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* or by postal mail at 20A-6 Ernesta Birznieka-Upisha Street, Riga,
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* LV-1050, Latvia, European Union.
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*
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* The interactive user interfaces in modified versions of the Program
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* are required to display Appropriate Legal Notices in accordance with
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* Section 5 of the GNU AGPL version 3.
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*
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* No trademark rights are granted under this License.
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*
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* All non-code elements of the Product, including illustrations,
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* icon sets, and technical writing content, are licensed under the
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* Creative Commons Attribution-ShareAlike 4.0 International License:
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* https://creativecommons.org/licenses/by-sa/4.0/legalcode
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*
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* This license applies only to such non-code elements and does not
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* modify or replace the licensing terms applicable to the Program's
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* source code, which remains licensed under the GNU Affero General
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* Public License v3.
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*
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* SPDX-License-Identifier: AGPL-3.0-only
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*/
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#include "EncryptionStream.h"
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#include "../Crypt/Decryptor.h"
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#include "../Binary/CFStream.h"
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#include "../../../../OOXML/Base/Base.h"
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#include "../../../../DesktopEditor/common/Types.h"
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#include "../../../../DesktopEditor/common/File.h"
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namespace XLS
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{
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EncryptionSummaryStream::EncryptionSummaryStream(XLS::CFStreamPtr stream, CRYPT::DecryptorPtr& decryptor)
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{
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if (!stream) return;
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if (!decryptor) return;
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char buf0[8];
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stream->read(buf0, 8);
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decryptor->Decrypt(buf0, 8, 0);
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_UINT32 StreamDescriptorArrayOffset, StreamDescriptorArraySize, EncryptedStreamDescriptorCount;
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StreamDescriptorArrayOffset = ((_UINT32*)buf0)[0];
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StreamDescriptorArraySize = ((_UINT32*)buf0)[1];
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// data
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unsigned long size = StreamDescriptorArrayOffset - 8;
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char *buf1 = new char[size];
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stream->read(buf1, size);
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decryptor->Decrypt(buf1, size, 0);
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//descriptions array
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char *buf2 = new char[StreamDescriptorArraySize];
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stream->read(buf2, StreamDescriptorArraySize);
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decryptor->Decrypt(buf2, StreamDescriptorArraySize, 0);
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EncryptedStreamDescriptorCount = ((_UINT32*)buf2)[0];
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_UINT32 pos = 4;
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for (size_t i = 0; i < EncryptedStreamDescriptorCount && pos < StreamDescriptorArraySize; ++i)
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{
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_UINT32 StreamOffset = ((_UINT32*)(buf2 + pos))[0]; pos += 4;
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_UINT32 StreamSize = ((_UINT32*)(buf2 + pos))[0]; pos += 4;
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_UINT16 Block = ((_UINT16*)(buf2 + pos))[0]; pos += 2;
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BYTE NameSize = ((BYTE*)(buf2 + pos))[0]; pos += 1;
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BYTE fStream = ((BYTE*)(buf2 + pos))[0]; pos += 1;
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pos += 4;
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std::wstring name;
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if (pos + NameSize < StreamDescriptorArraySize)
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{
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name = NSFile::CUtf8Converter::GetWStringFromUTF16((unsigned short*)(buf2 + pos), NameSize);
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}
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pos += NameSize * 2;
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if (pos + 1 < StreamDescriptorArraySize && buf2[pos] == 0 && buf2[pos + 1] == 0)
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pos += 2; // padding???
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std::pair<boost::shared_array<unsigned char>, size_t> data;
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if (StreamSize + StreamOffset <= StreamDescriptorArrayOffset)
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{
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data.first = boost::shared_array<BYTE>(new BYTE[StreamSize]);
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data.second = StreamSize;
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memcpy(data.first.get(), buf1 + StreamOffset - 8, StreamSize); // 8 = start stream offset
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}
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streams.insert(std::make_pair(name, data));
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}
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delete[]buf1;
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delete[]buf2;
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}
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std::pair<boost::shared_array<unsigned char>, size_t> EncryptionSummaryStream::GetStream(const std::wstring &name)
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{
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std::map<std::wstring, std::pair<boost::shared_array<unsigned char>, size_t>>::iterator pFind =
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streams.find(name);
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if (pFind != streams.end())
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return pFind->second;
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else
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{
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std::pair<boost::shared_array<unsigned char>, size_t> empty(NULL, 0);
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return empty;
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}
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}
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} // namespace XLS
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