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89 lines
3.8 KiB
C++
89 lines
3.8 KiB
C++
/*
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* (c) Copyright Ascensio System SIA 2010-2017
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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 Lubanas st. 125a-25, Riga, Latvia,
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* EU, LV-1021.
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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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#pragma once
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#include "CFRecordType.h"
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#include "BinSmartPointers.h"
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#include <Logic/GlobalWorkbookInfo.h>
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#include <Logic/Biff_structures/ODRAW/OfficeArtRecordHeader.h>
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namespace XLS
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{
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// The only purpose of the reader is to avoid seeking back through IStream when, for example,
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// we have read a record from a binary stream to the CFRecord, but the record of this type is
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// not waitable right at the moment and shall be read a little bit later.
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// Example of a construction:
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// PIVOTTH = SXTH *ContinueFrt
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// ContinueFrt may appear in the stream and may not. So, this class will increase performance much
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class CFStreamCacheReader
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{
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public:
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CFStreamCacheReader(CFStreamPtr stream, const GlobalWorkbookInfoPtr global_info);
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~CFStreamCacheReader();
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// Reads the next CFRecord from the CFStream and if it's type is not the desired one, caches it for the next call
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CFRecordPtr getNextRecord(const CFRecordType::TypeId desirable_type, const bool gen_except = false);
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// Check if the next read record would be of desired type
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const bool checkNextRecord(const CFRecordType::TypeId desirable_type, const size_t num_records_to_check = 1);
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// Checks whether the next record is Continue and append its data to the real record if so
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void checkAndAppendContinueData();
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const bool isEOF() const;
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// Skip the specified number of unsigned chars without processing
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void skipNunBytes(const size_t n);
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void SkipRecord();
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// Seek to the next substream (Read all records till EOF then skip EOF)
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// Doesn't generate EndOfStreamReached if the stream is the last one
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const bool SeekToEOF();
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// Extract the next record from the stream leaving it in the cache for future read.
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// Always call resetPointerToBegin for the extracted CFRecord after using it
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CFRecordPtr touchTheNextRecord();
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// Check the next record type
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const CFRecordType::TypeId getNextRecordType();
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GlobalWorkbookInfoPtr getGlobalWorkbookInfo() { return global_info_; }
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private:
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// Make sure the internal buffer has concrete number of records. Returns number of records read
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const size_t readFromStream(const size_t num_of_records_min_necessary);
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private:
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CFStreamPtr stream_;
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CFRecordPtrList records_cache;
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GlobalWorkbookInfoPtr global_info_;
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std::vector<std::string> skippable_records_names;
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};
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} // namespace XLS
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