TMidasFile.cxx

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//  TMidasFile.cxx.
#include <iostream>

#include <Rtypes.h>

#include "TMidasFile.h"
#include "TMidasEvent.h"

using std::cerr;
using std::endl;
using std::ios;

TMidasFile::TMidasFile()
{

  //
  // check for the endian, as we may need to byte swap the event header
  //
  Long_t endian = 0x12345678;

  fByteSwap = *(reinterpret_cast<char *> (&endian)) == 0x78 ? false : true;
}

TMidasFile::~TMidasFile()
{
}

const Char_t * TMidasFile::GetFilename() const
{
  return fFileName.c_str();
}

Bool_t TMidasFile::Open(const Char_t *fileName)
{
  Bool_t status = true;
  fFileName = fileName;
  open(fFileName.c_str(), ios::binary);
  if (! is_open()) {
    cerr << "Open: ERROR - cannot open file \"" << fFileName
         << "\", exception = " << exceptions()  << endl;
    status = false;
  }
  return status;
}

Bool_t TMidasFile::Read(TMidasEvent *midasEvent)
{
  Bool_t status = false;

  read(reinterpret_cast<Char_t *>(midasEvent->GetEventHeader()),
       sizeof(EventHeader_t));
  if (fByteSwap)
    midasEvent->SwapBytesEventHeader();

  if (! eof()) {
    //
    // check to make sure we're still OK
    //
    if (fail())
      cerr << "Read: Unexpected failure reading file \""
           << fFileName << "\"" << endl;
    else {
      //
      // check data-size
      //
      if (midasEvent->IsGoodSize()) {
        midasEvent->AllocateData();
        read(midasEvent->GetData(), midasEvent->GetDataSize());
        //
        // check we're still ok
        //
        if (good())
          status = true;
        else
          cerr << "Read: Unexpected error reading file \""
               << fFileName << "\"" << endl;
      } else {
        cerr << "Read: Invalid event size "      << midasEvent->GetDataSize()
             << " bytes in file \"" << fFileName << "\"" << endl;
      }
    }
  }
  return status;
}

void TMidasFile::Close()
{
  if (is_open())
    close();
}

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