Added new osga plugin for reading OSG native archives

src/osgPlugins/osga/ReaderWriterOSGA.cpp

@@ -0,0 +1,71 @@
+#include <osg/Notify>
+
+#include <osgDB/FileUtils>
+#include <osgDB/FileNameUtils>
+#include <osgDB/Archive>
+
+class ReaderWriterOSGA : public osgDB::ReaderWriter
+{
+public:
+    ReaderWriterOSGA() { }
+
+    virtual const char* className() const { return "OpenSceneGraph Archive Reader/Writer"; }
+    virtual bool acceptsExtension(const std::string& extension)
+    {
+        return osgDB::equalCaseInsensitive(extension,"osga");
+    }
+
+    virtual ReadResult openArchive(const std::string& file,ArchiveStatus status, unsigned int indexBlockSize = 4096, const Options* = NULL)
+    {
+        std::string ext = osgDB::getLowerCaseFileExtension(file);
+        if (!acceptsExtension(ext)) return ReadResult::FILE_NOT_HANDLED;
+
+        std::string fileName = osgDB::findDataFile( file );
+        if (fileName.empty()) return ReadResult::FILE_NOT_FOUND;
+    
+        osg::ref_ptr<osgDB::Archive> archive = new osgDB::Archive;
+        if (!archive->open(fileName, status, indexBlockSize))
+        {
+            return ReadResult(ReadResult::FILE_NOT_HANDLED);
+        }
+
+        return archive.get();
+    }
+
+    virtual ReadResult readObject(const std::string& /*fileName*/,const Options* =NULL) { return ReadResult(ReadResult::FILE_NOT_HANDLED); }
+    virtual ReadResult readImage(const std::string& /*fileName*/,const Options* =NULL) { return ReadResult(ReadResult::FILE_NOT_HANDLED); }
+    virtual ReadResult readHeightField(const std::string& /*fileName*/,const Options* =NULL) { return ReadResult(ReadResult::FILE_NOT_HANDLED); }
+
+    virtual ReadResult readNode(const std::string& file,const Options* options)
+    {
+        ReadResult result = openArchive(file,osgDB::Archive::READ);
+        
+        if (!result.validArchive()) return result;
+
+
+        osg::ref_ptr<ReaderWriter::Options> local_options = new ReaderWriter::Options;
+        local_options->setDatabasePath(file);
+
+        ReadResult result_2 = result.getArchive()->readNode(result.getArchive()->getMasterFileName(),local_options.get());
+        
+
+        // register the archive so that it is cached for future use.
+        osgDB::Registry::instance()->addToArchiveCache(file, result.getArchive());
+
+
+        return result_2;
+    }
+
+    virtual WriteResult writeObject(const osg::Object& /*obj*/,const std::string& /*fileName*/,const Options* =NULL) {return WriteResult(WriteResult::FILE_NOT_HANDLED); }
+    virtual WriteResult writeImage(const osg::Image& /*image*/,const std::string& /*fileName*/,const Options* =NULL) {return WriteResult(WriteResult::FILE_NOT_HANDLED); }
+    virtual WriteResult writeHeightField(const osg::HeightField& /*heightField*/,const std::string& /*fileName*/,const Options* =NULL) {return WriteResult(WriteResult::FILE_NOT_HANDLED); }
+    virtual WriteResult writeNode(const osg::Node& /*node*/,const std::string& /*fileName*/,const Options* =NULL) { return WriteResult(WriteResult::FILE_NOT_HANDLED); }
+
+protected:
+
+    
+};
+
+
+// register with Registry to instantiate the above reader/writer.
+osgDB::RegisterReaderWriterProxy<ReaderWriterOSGA> g_osgaReaderWriterProxy;