108 lines
3.3 KiB
C
108 lines
3.3 KiB
C
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/**
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* \file storage_chunks.h
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* \brief CStorageChunks
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* \date 2012-08-18 09:20GMT
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* \author Jan Boon (Kaetemi)
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* CStorageChunks
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*/
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/*
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* Copyright (C) 2012 by authors
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*
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* This file is part of RYZOM CORE PIPELINE.
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* RYZOM CORE PIPELINE is free software: you can redistribute it
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* and/or modify it under the terms of the GNU Affero General Public
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* License as published by the Free Software Foundation, either
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* version 3 of the License, or (at your option) any later version.
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*
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* RYZOM CORE PIPELINE is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public
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* License along with RYZOM CORE PIPELINE. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#ifndef PIPELINE_STORAGE_CHUNKS_H
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#define PIPELINE_STORAGE_CHUNKS_H
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#include <nel/misc/types_nl.h>
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// STL includes
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// NeL includes
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#include <nel/misc/stream.h>
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// Project includes
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namespace PIPELINE {
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namespace MAX {
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/**
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* \brief CStorageChunks
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* \date 2012-08-18 09:20GMT
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* \author Jan Boon (Kaetemi)
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* CStorageChunks
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*/
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class CStorageChunks
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{
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private:
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struct CChunk
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{
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// Size of the chunk header, 6 for 32 bit, 14 for 64 bit
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uint8 HeaderSize;
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// Where the header starts
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sint32 OffsetBegin;
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// Identifier
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uint16 Id;
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// Size including header size
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uint32 Size;
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inline sint32 getSizeWithHeader() const { return (sint32)(Size & 0x7FFFFFFF); }
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inline sint32 getSize() const { return getSizeWithHeader() - (sint32)HeaderSize; }
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inline bool isContainer() const { return (Size & 0x80000000) == 0x80000000; }
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inline sint32 endOfChunk() const { return OffsetBegin + getSizeWithHeader(); }
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inline sint32 getDataBegin() const { return OffsetBegin + (sint32)HeaderSize; }
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};
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public:
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CStorageChunks(NLMISC::IStream &stream, sint64 size = 0);
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virtual ~CStorageChunks();
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// Returns true if there's another chunk, false if no more chunks in this container or if the current chunk is not a container
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bool enterChunk();
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// Reads and skips chunks until the one with given id is found, or writes a chunk with this id
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bool enterChunk(uint16 id, bool container);
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// Returns the number of skipped bytes in read more, returns chunk size including header in write mode
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sint32 leaveChunk();
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inline bool is64Bit() const { return m_Is64Bit; }
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inline void set64Bit(bool enabled = true) { m_Is64Bit = enabled; }
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inline uint16 getChunkId() const { return currentChunk()->Id; }
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inline sint32 getChunkSize() const { return currentChunk()->getSize(); }
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inline bool isChunkContainer() const { return currentChunk()->isContainer(); }
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inline bool endOfChunk() const { return /*m_Chunks.size() == 1 ? eof() :*/ m_Stream.getPos() >= currentChunk()->endOfChunk(); }
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inline NLMISC::IStream &stream() { return m_Stream; }
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private:
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inline const CChunk *currentChunk() const { return &m_Chunks[m_Chunks.size() - 1]; }
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inline CChunk *currentChunk() { return &m_Chunks[m_Chunks.size() - 1]; }
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private:
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NLMISC::IStream &m_Stream;
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std::vector<CChunk> m_Chunks;
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bool m_Is64Bit;
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}; /* class CStorageChunks */
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} /* namespace MAX */
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} /* namespace PIPELINE */
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#endif /* #ifndef PIPELINE_STORAGE_CHUNKS_H */
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/* end of file */
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