/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/IORawData/CSCCommissioning/src/FileReaderDDU.h

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#ifndef FileReaderDDU_h
#define FileReaderDDU_h

#include <stdexcept>   // std::runtime_error
#include <unistd.h>    // size_t

class FileReaderDDU {
private:
        unsigned short raw_event[200000];

        unsigned long long word_0, word_1, word_2; // To remember some history
        unsigned long long file_buffer[4000];      // Read data block for efficiency

        unsigned long long *end, *file_buffer_end; // where stoped last time and where is end

public:
        enum {Header=1,Trailer=2,DDUoversize=4,FFFF=8,Unknown=16,EndOfStream=32};
        enum {Type1=Header|Trailer, Type2=Header, Type3=Header|DDUoversize, Type4=Trailer, Type5=Unknown, Type6=Unknown|DDUoversize, Type7=FFFF}; // Andrey Korytov's notations
private:
        unsigned int eventStatus, selectCriteria, acceptCriteria, rejectCriteria;

        int fd;

public:
        int    open(const char *filename) throw (std::runtime_error);
        size_t read(const unsigned short* &buf) throw (std::runtime_error); // Just plain read function
        size_t next(const unsigned short* &buf, int prescaling=1) throw (std::runtime_error); // Same as ``read'', but returns only events pass certain criteria
        void select(unsigned int criteria) throw() { selectCriteria = criteria; } // return events satisfying all criteria
        void accept(unsigned int criteria) throw() { acceptCriteria = criteria; } // return all events satisfying any of criteria
        void reject(unsigned int criteria) throw() { rejectCriteria = criteria; } // return events not satisfying any of criteria

        unsigned int status(void) const throw() { return eventStatus; }

        FileReaderDDU(void);
        virtual ~FileReaderDDU(void);
};

#endif