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109 lines
3.9 KiB
C++
109 lines
3.9 KiB
C++
/*
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* (c) Copyright Ascensio System SIA 2010-2019
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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. In accordance with
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* Section 7(a) of the GNU AGPL its Section 15 shall be amended to the effect
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* that Ascensio System SIA expressly excludes the warranty of non-infringement
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* of any third-party rights.
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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: http://www.gnu.org/licenses/agpl-3.0.html
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*
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* You can contact Ascensio System SIA at 20A-12 Ernesta Birznieka-Upisha
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* street, Riga, Latvia, EU, LV-1050.
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*
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* The interactive user interfaces in modified source and object code versions
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* of the Program must display Appropriate Legal Notices, as required under
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* Section 5 of the GNU AGPL version 3.
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*
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* Pursuant to Section 7(b) of the License you must retain the original Product
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* logo when distributing the program. Pursuant to Section 7(e) we decline to
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* grant you any rights under trademark law for use of our trademarks.
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*
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* All the Product's GUI elements, including illustrations and icon sets, as
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* well as technical writing content are licensed under the terms of the
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* Creative Commons Attribution-ShareAlike 4.0 International. See the License
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* terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
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*
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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 = NSFile::CUtf8Converter::GetWStringFromUTF16((unsigned short*)(buf2 + pos), NameSize); pos += NameSize * 2;
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std::pair<boost::shared_array<unsigned char>, size_t> data;
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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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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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