148 lines
4.8 KiB
C++
148 lines
4.8 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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#ifndef OSGDB_ARCHIVE
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#define OSGDB_ARCHIVE 1
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#include <osgDB/ReaderWriter>
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#include <fstream>
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#include <list>
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namespace osgDB {
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/** Base class for implementing database Archives. */
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class OSGDB_EXPORT Archive : public ReaderWriter
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{
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public:
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Archive();
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virtual ~Archive();
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virtual const char* libraryName() const { return "osgDB"; }
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virtual const char* className() const { return "Archive"; }
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virtual bool acceptsExtension(const std::string& /*extension*/) { return true; }
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enum Status
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{
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READ,
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WRITE
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};
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/** open the archive.*/
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virtual void create(const std::string& filename, unsigned int indexBlockSize=4096);
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/** open the archive.*/
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virtual void open(const std::string& filename, Status status);
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/** close the archive.*/
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virtual void close();
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/** return true if file exists in archive.*/
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virtual bool fileExists(const std::string& filename) const;
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virtual ReadResult readObject(const std::string& fileName,const Options* options=NULL);
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virtual ReadResult readImage(const std::string& fileName,const Options* options=NULL);
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virtual ReadResult readHeightField(const std::string& fileName,const Options* options=NULL);
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virtual ReadResult readNode(const std::string& fileName,const Options* options=NULL);
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virtual WriteResult writeObject(const osg::Object& obj,const std::string& fileName,const Options* options=NULL);
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virtual WriteResult writeImage(const osg::Image& image,const std::string& fileName,const Options* options=NULL);
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virtual WriteResult writeHeightField(const osg::HeightField& heightField,const std::string& fileName,const Options* options=NULL);
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virtual WriteResult writeNode(const osg::Node& node,const std::string& fileName,const Options* options=NULL);
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protected:
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typedef std::istream::pos_type pos_type;
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typedef std::map<std::string, pos_type> FileNamePositionMap;
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class IndexBlock : public osg::Referenced
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{
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public:
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IndexBlock(unsigned int blockSize=0);
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inline pos_type getPosition() const { return _filePosition; }
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inline unsigned int getBlockSize() const { return _blockSize; }
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void setPositionNextIndexBlock(pos_type position);
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inline pos_type getPositionNextIndexBlock() const { return _filePositionNextIndexBlock; }
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void read(std::istream& in);
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bool getFileReferences(FileNamePositionMap& indexMap);
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inline bool requiresWrite() const { return _requiresWrite; }
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void write(std::ostream& out);
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inline bool spaceAvailable(pos_type position, const std::string& filename) const
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{
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unsigned requiredSize = sizeof(position)+sizeof(unsigned int)+filename.size();
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return (_offsetOfNextAvailableSpace + requiredSize)<_blockSize;
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}
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bool addFileReference(pos_type position, const std::string& filename);
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protected:
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void allocateData(unsigned int blockSize);
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virtual ~IndexBlock();
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bool _requiresWrite;
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pos_type _filePosition;
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unsigned int _blockSize;
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pos_type _filePositionNextIndexBlock;
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unsigned int _offsetOfNextAvailableSpace;
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unsigned char* _data;
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};
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typedef std::list< osg::ref_ptr<IndexBlock> > IndexBlockList;
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void readIndexBlocks();
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void writeIndexBlocks();
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bool addFileReference(pos_type position, const std::string& fileName);
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static float s_currentSupportedVersion;
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float _version;
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Status _status;
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std::ifstream _input;
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std::ofstream _output;
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IndexBlockList _indexBlockList;
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FileNamePositionMap _indexMap;
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};
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}
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#endif // OSGDB_ARCHIVE
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