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CSCFileReader.cc

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#include "CSCFileReader.h"

//#include <iostream.h>

#include <errno.h>
#include <stdlib.h>
#include <string>

#include <DataFormats/FEDRawData/interface/FEDHeader.h>
#include <DataFormats/FEDRawData/interface/FEDTrailer.h>
#include <DataFormats/FEDRawData/interface/FEDNumbering.h>
#include <DataFormats/Provenance/interface/EventID.h>
#include <DataFormats/Provenance/interface/Timestamp.h>
#include <DataFormats/FEDRawData/interface/FEDRawData.h>
#include <DataFormats/FEDRawData/interface/FEDRawDataCollection.h>

#include <FWCore/ParameterSet/interface/ParameterSet.h>
#include "FWCore/MessageLogger/interface/MessageLogger.h"

#include <vector>
#include <string>
#include <iosfwd>
#include <sstream>
#include <iostream>
#include <algorithm>

#define nRUIs 40
#define nFUs  4

CSCFileReader::CSCFileReader(const edm::ParameterSet& pset):DaqBaseReader(){
        LogDebug("CSCFileReader|ctor")<<"Started ...";
        // Below some data members are recycled for both cases: RUIs and FUs
        //  this is ok as long as eighter of RUI or FU are are provided in .cfg (not both)
        nActiveRUIs = 0;
        nActiveFUs  = 0;
        for(int unit=0; unit<nRUIs; unit++){
                std::ostringstream ruiName, fuName;
                ruiName<<"RUI"<<(unit<10?"0":"")<<unit<<std::ends;
                fuName <<"FU" <<unit<<std::ends;
                std::vector<std::string> ruiFiles = pset.getUntrackedParameter< std::vector<std::string> >(ruiName.str().c_str(),std::vector<std::string>(0));
                std::vector<std::string> fuFiles  = pset.getUntrackedParameter< std::vector<std::string> >(fuName.str().c_str(),std::vector<std::string>(0));
                if( ruiFiles.begin() != ruiFiles.end() ) nActiveRUIs++;
                if( fuFiles.begin()  != fuFiles.end()  ) nActiveFUs++;
        }
        if( nActiveFUs && nActiveRUIs )
                throw cms::Exception("CSCFileReader|configuration")<<"RUIs and FUs in conflict: either RUI or FU may be defined at a time, not both";
        if( !nActiveFUs && !nActiveRUIs )
                throw cms::Exception("CSCFileReader|configuration")<<"Module lacks configuration";


        // Get list of RUI input files from .cfg file
        for(int rui=0; rui<nRUIs && !nActiveFUs; rui++){
                std::ostringstream name;
                name<<"RUI"<<(rui<10?"0":"")<<rui<<std::ends;

                // Obtain list of files associated with current RUI
                fileNames[rui] = pset.getUntrackedParameter< std::vector<std::string> >(name.str().c_str(),std::vector<std::string>(0));
                currentFile[rui] = fileNames[rui].begin();

                // If list of files is not empty, open first file
                if( currentFile[rui] != fileNames[rui].end() ){
                        try {
                                RUI[rui].open(currentFile[rui]->c_str());
                        } catch ( std::runtime_error err ){
                                throw cms::Exception("CSCFileReader")<<"InputFileMissing: "<<err.what()<<" (errno="<<errno<<")";
                        }
                        nActiveRUIs++;
                }

                // Filter out possible corruptions
                RUI[rui].reject(FileReaderDDU::DDUoversize|FileReaderDDU::FFFF|FileReaderDDU::Unknown);
                // Do not select anything in particular
                RUI[rui].select(0);

                currentL1A[rui] = -1;
        }

        // Get list of FU input files from .cfg file
        for(int fu=0; fu<nFUs && !nActiveRUIs; fu++){
                std::ostringstream name;
                name<<"FU"<<fu<<std::ends;

                // Obtain list of files associated with current FU
                fileNames[fu] = pset.getUntrackedParameter< std::vector<std::string> >(name.str().c_str(),std::vector<std::string>(0));
                currentFile[fu] = fileNames[fu].begin();

                // If list of files is not empty, open first file
                if( currentFile[fu] != fileNames[fu].end() ){
                        try {
                                FU[fu].open(currentFile[fu]->c_str());
                        } catch ( std::runtime_error err ){
                                throw cms::Exception("CSCFileReader")<<"InputFileMissing: "<<err.what()<<" (errno="<<errno<<")";
                        }
                        nActiveFUs++;
                }

                // Filter out possible corruptions
                FU[fu].reject(FileReaderDCC::DCCoversize|FileReaderDCC::FFFF|FileReaderDCC::Unknown);
                // Do not select anything in particular
                FU[fu].select(0);

                currentL1A[fu] = -1;
        }

        if( nActiveRUIs && !nActiveFUs ){
                // Assign RUIs to FEDs
                for(int fed=FEDNumbering::getCSCFEDIds().first; fed<=FEDNumbering::getCSCFEDIds().second; fed++){
                        std::ostringstream name;
                        name<<"FED"<<fed<<std::ends;
                        std::vector<std::string> rui_list = pset.getUntrackedParameter< std::vector<std::string> >(name.str().c_str(),std::vector<std::string>(0));
                        for(std::vector<std::string>::const_iterator rui=rui_list.begin(); rui!=rui_list.end(); rui++)
                                FED[fed].push_back((unsigned int)atoi(rui->c_str()+rui->length()-2));
                }
                // Do the same for Track-Finder FED
                for(int fed=FEDNumbering::getCSCTFFEDIds().first; fed<=FEDNumbering::getCSCTFFEDIds().second; fed++){
                        std::ostringstream name;
                        name<<"FED"<<fed<<std::ends;
                        std::vector<std::string> rui_list = pset.getUntrackedParameter< std::vector<std::string> >(name.str().c_str(),std::vector<std::string>(0));
                        for(std::vector<std::string>::const_iterator rui=rui_list.begin(); rui!=rui_list.end(); rui++)
                                FED[fed].push_back((unsigned int)atoi(rui->c_str()+rui->length()-2));
                }
        }
        // Starting point
        firstEvent = pset.getUntrackedParameter<int>("firstEvent",0);
        nEvents = 0;
        expectedNextL1A = -1;

        // If Track-Finder was in readout specify its position in the record or set -1 otherwise
        //  Current agriment is that if there is a TF event it is first DDU record
        tfDDUnumber = pset.getUntrackedParameter<int>("tfDDUnumber",-1);

        // For efficiency reasons create this big chunk of data only once
        tmpBuf = new unsigned short[200000*nRUIs+4*4];
        // Event buffer and its length for every FU
        fuEvent[0]=0; fuEventSize[0]=0;
        fuEvent[1]=0; fuEventSize[1]=0;
        fuEvent[2]=0; fuEventSize[2]=0;
        fuEvent[3]=0; fuEventSize[3]=0;

        LogDebug("CSCFileReader|ctor")<<"... and finished";
}

CSCFileReader::~CSCFileReader(void){ if(tmpBuf) delete [] tmpBuf; }

int CSCFileReader::readRUI(int rui, const unsigned short* &buf, size_t &length){
        if( currentFile[rui] == fileNames[rui].end() ) return -1;
        do {
                try {
                        length = RUI[rui].next(buf);
                } catch ( std::runtime_error err ){
                        throw cms::Exception("CSCFileReader|reading")<<"EndOfStream: "<<err.what()<<" (errno="<<errno<<")";
                }
                if( length==0 ){ // end of file, try next one
                        if( ++currentFile[rui] != fileNames[rui].end() ){
                                try {
                                        RUI[rui].open(currentFile[rui]->c_str());
                                } catch ( std::runtime_error err ){
                                        throw cms::Exception("CSCFileReader|reading")<<"InputFileMissing: "<<err.what()<<" (errno="<<errno<<")";
                                }
                        } else return -1;
                }
        } while( length==0 );
        return buf[2]|((buf[3]&0xFF)<<16);
}

int CSCFileReader::readFU(int fu, const unsigned short* &buf, size_t &length){
        if( currentFile[fu] == fileNames[fu].end() ) return -1;
        do {
                try {
                        length = FU[fu].next(buf);
                } catch ( std::runtime_error err ){
                        throw cms::Exception("CSCFileReader|reading")<<"EndOfStream: "<<err.what()<<" (errno="<<errno<<")";
                }
                if( length==0 ){ // end of file, try next one
                        if( ++currentFile[fu] != fileNames[fu].end() ){
                                try {
                                        FU[fu].open(currentFile[fu]->c_str());
                                } catch ( std::runtime_error err ){
                                        throw cms::Exception("CSCFileReader|reading")<<"InputFileMissing: "<<err.what()<<" (errno="<<errno<<")";
                                }
                        } else return -1;
                }
        } while( length==0 );
        // Take L1A from first DDU header in the DCC record (shift=8)
        return buf[2+8]|((buf[3+8]&0xFF)<<16);
}

int CSCFileReader::buildEventFromRUIs(FEDRawDataCollection *data){
        // Event buffer and its length for every RUI
        const unsigned short *buf[nRUIs];
        size_t length[nRUIs];
        bzero(length,sizeof(length));

        int eventNumber =-1; // Will determine below

        do {
                // Read next event from RUIs
                for(int rui=0; rui<nRUIs; rui++){
                        // read event from the RUI only in two cases:
                        //     1) it is readable (currentL1A>0) and we expect next event from the RUI
                        //     2) it is first time (expectedNextL1A<0)
                        if((currentL1A[rui]>0 && currentL1A[rui]<expectedNextL1A) || expectedNextL1A<0 )
                                currentL1A[rui] = readRUI(rui,buf[rui],length[rui]);
                }
                eventNumber =-1;

                // Select lowest L1A from all RUIs and don't expect next event from RUIs that currently hold higher L1A
                for(int rui=0; rui<nRUIs; rui++)
                        if( currentL1A[rui]>=0 && (eventNumber>currentL1A[rui] || eventNumber==-1) ) eventNumber=currentL1A[rui];
                // No readable RUIs => fall out
                if( eventNumber<0 ) return -1;
                // Expect next event to be incremented by 1 wrt. to the current event
                expectedNextL1A = eventNumber+1;

        } while(nEvents++<firstEvent);

        for(std::map<unsigned int,std::list<unsigned int> >::const_iterator fed=FED.begin(); fed!=FED.end(); fed++)
                if( fed->first<(unsigned int)FEDNumbering::getCSCTFFEDIds().first ){
                        // Now let's pretend that DDU data were wrapped with DCC Header (2 64-bit words) and Trailer (2 64-bit words):
                        unsigned short *dccBuf=tmpBuf, *dccCur=dccBuf;
                        dccCur[3] = 0x5000; dccCur[2] = 0x0000; dccCur[1] = 0x0000; dccCur[0] = 0x005F; // Fake DCC Header 1
                        dccCur[7] = 0xD900; dccCur[6] = 0x0000; dccCur[5] = 0x0000; dccCur[4] = 0x0017; // Fake DCC Header 2
                        dccCur += 8;

                        for(std::list<unsigned int>::const_iterator rui=fed->second.begin(); rui!=fed->second.end(); rui++){
//cout<<"Event:"<<eventNumber<<"  FED:"<<fed->first<<"  RUI:"<<*(fed->second.begin())<<" currL1A:"<<currentL1A[*rui]<<endl;
                                if( currentL1A[*rui]==eventNumber ){
                                        if(dccCur-dccBuf+length[*rui]>=200000*nRUIs+8) throw cms::Exception("CSCFileReader|eventBuffer")<<"OutOfBuffer: Event size exceeds maximal size allowed!";
                                        memcpy(dccCur,buf[*rui],length[*rui]*sizeof(unsigned short));
                                        dccCur += length[*rui];
                                }
                        }
                        dccCur[3] = 0xEF00; dccCur[2] = 0x0000; dccCur[1] = 0x0000; dccCur[0] = 0x0000; // Fake DCC Trailer 2
                        dccCur[7] = 0xAF00; dccCur[6] = 0x0000; dccCur[5] = 0x0000; dccCur[4] = 0x0007; // Fake DCC Trailer 2
                        dccCur += 8;

                        FEDRawData& fedRawData = data->FEDData(fed->first);
                        fedRawData.resize((dccCur-dccBuf)*sizeof(unsigned short));
                        std::copy((unsigned char*)dccBuf,(unsigned char*)dccCur,fedRawData.data());
                } else {
                        for(std::list<unsigned int>::const_iterator rui=fed->second.begin(); rui!=fed->second.end(); rui++){
                                FEDRawData& fedRawData = data->FEDData(fed->first);
                                fedRawData.resize(length[*rui]*sizeof(unsigned short));
                                std::copy((unsigned char*)buf[*rui],(unsigned char*)(buf[*rui]+length[*rui]),fedRawData.data());
                        }
                }

        return eventNumber;
}

int CSCFileReader::nextEventFromFUs(FEDRawDataCollection *data){
        int eventNumber =-1; // Will determine below

        // If this is a first time - read one event from each FU
        if( expectedNextL1A<0 )
                for(int fu=0; fu<nFUs; fu++)
                        currentL1A[fu] = readFU(fu,fuEvent[fu],fuEventSize[fu]);

        // Keep buffers for every FU ready at all times
        // When buffer from some FU is ready to go as the next event,
        //  release it, but read next one
        int readyToGo = -1;
        for(int fu=0; fu<nFUs; fu++){
                // If FU is readable and (first loop of this cycle or current FU holds smallest L1A)
                if(currentL1A[fu]>=0 && (eventNumber<0 || currentL1A[fu]<eventNumber)){
                        readyToGo   = fu;
                        eventNumber = currentL1A[fu];
                }
        }
        // No readable FUs => fall out
        if( readyToGo<0 ) return -1;

        expectedNextL1A = eventNumber + 1;

        // Compose event from DDC record striped of Track-Finder DDU and a separate TF DDU event
        unsigned long long *start = (unsigned long long *)fuEvent[readyToGo];
        unsigned long long *end   = 0;
        enum {Header=1,Trailer=2};
        unsigned int eventStatus  = 0;
        for(int dduRecord=0; dduRecord<=tfDDUnumber; dduRecord++){
                unsigned long long word_0=0, word_1=0, word_2=0;
                size_t dduWordCount = 0;
                while( !end && dduWordCount<fuEventSize[readyToGo] ){
                        unsigned long long *dduWord = start;

                        while( dduWordCount<fuEventSize[readyToGo] ){
                                word_0 =  word_1; // delay by 2 DDU words
                                word_1 =  word_2; // delay by 1 DDU word
                                word_2 = *dduWord;// current DDU word
                                if( (word_2&0xFFFFFFFFFFFF0000LL)==0x8000000180000000LL ){
                                        if( eventStatus&Header ){ // Second header
                                                word_2 = word_1;
                                                end = dduWord;
                                                break;
                                        }
                                        start = dduWord;
                                }
                                if( (word_0&0xFFFFFFFFFFFF0000LL)==0x8000FFFF80000000LL ){
                                        eventStatus |= Trailer;
                                        end = ++dduWord;
                                        break;
                                }
                                // Increase counters by one DDU word
                                dduWord++;
                                dduWordCount++;
                        }
                }
                // If reach max length
                if( dduWordCount==fuEventSize[readyToGo] ){
                        end = (unsigned long long *)(fuEvent[readyToGo]+fuEventSize[readyToGo]);
                        break;
                }
        }
        // Include 0x5xxx preHeader if exists
        if( start>(unsigned long long *)fuEvent[readyToGo] && (*(start-1)&0xF000000000000000LL)==0x5000000000000000LL ) start--;
        // Cut out Track-Finder DDU from the buffer
        FEDRawData& tfRawData = data->FEDData(FEDNumbering::getCSCTFFEDIds().first);
        tfRawData.resize((end-start)*sizeof(unsigned long long));
        std::copy((unsigned char*)start,(unsigned char*)end,tfRawData.data());

        // Create a new buffer from everything before and after TF DDU
        unsigned short *event = tmpBuf;
        memcpy(event,fuEvent[readyToGo],((unsigned short*)start-fuEvent[readyToGo])*sizeof(unsigned short));
        event += ((unsigned short*)start-fuEvent[readyToGo]);
        memcpy(event,end,(fuEvent[readyToGo]+fuEventSize[readyToGo]-(unsigned short*)end)*sizeof(unsigned short));
        event += fuEvent[readyToGo]+fuEventSize[readyToGo]-(unsigned short*)end;
        FEDRawData& fedRawData = data->FEDData(FEDNumbering::getCSCFEDIds().first);
        fedRawData.resize((fuEventSize[readyToGo]-((unsigned short*)end-(unsigned short*)start))*sizeof(unsigned short));
        std::copy((unsigned char*)tmpBuf,(unsigned char*)event,fedRawData.data());

        currentL1A[readyToGo] = readFU(readyToGo,fuEvent[readyToGo],fuEventSize[readyToGo]);

        return eventNumber;
}

bool CSCFileReader::fillRawData(edm::EventID& eID, edm::Timestamp& tstamp, FEDRawDataCollection *& data){
        data = new FEDRawDataCollection();

        int runNumber   = 0; // Unknown at the level of EMu local DAQ
        int eventNumber =-1; // Will determine below

        if( !nActiveFUs && nActiveRUIs ){
                eventNumber = buildEventFromRUIs(data);
        } else {
                eventNumber = nextEventFromFUs(data);
        }

        if( eventNumber<0 ) return false;

        eID = edm::EventID(runNumber,eventNumber);

        return true;
}

#undef nRUIs
#undef nFUs

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