FileReaderDDU.h

Go to the documentation of this file.

#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