/** @file
 * $Source: /home/cvsmanager/yoda/techmodel/VarDumpReader.cpp,v $
 * $Id: VarDumpReader.cpp,v 2.0 2004/09/21 20:50:54 kusanagi Exp $
 * $Author: kusanagi $
 * 
 * Implementation of the VarDumpReader class.
 */

#include <string>
#include <log4cxx/logger.h>
#include <fstream>
#include "stdio.h"
extern "C" {
    #include "CRC.h"
}

#include "ReaderAlgorithms.h"

using namespace pamela;
using namespace pamela::techmodel;

static log4cxx::LoggerPtr logger = log4cxx::Logger::getLogger(_T("pamela.techmodel.VarDumpReader"));

/**
 * Constructor. 
 */
VarDumpReader::VarDumpReader(void): 
  TechmodelAlgorithm(PacketType::VarDump, "TechmodelVarDump") { 
  VarDump = new VarDumpEvent();
}

/**
 * Get a string with the version info of the algorithm.
 */
std::string VarDumpReader::GetVersionInfo(void) const {
  return     "$Header: /home/cvsmanager/yoda/techmodel/VarDumpReader.cpp,v 2.0 2004/09/21 20:50:54 kusanagi Exp $\n";
}

/**
 * Initialize the algorithm with a special run. This will initialize the
 * event reader routines for all packet types.
 */
void VarDumpReader::Init(PamelaRun *run) {
  SetInputStream(run);
  run->WriteSubPacket(this, &VarDump, VarDump->Class());
}

/**
 * Unpack the VarDump event from an input file.
 */
void VarDumpReader::RunEvent(int EventNumber, long int length) throw (WrongCRCException){
 
  char     *subData;
  char      eventCRC[2];
  UINT16    subCRC;      //CRC of the data
  UINT16    readCRC;     //CRC read from the end of the subpacket
  long int  dataLength;
  int vars;
  
    //the 2 bytes subtracted belong to the final event CRC bytes
    dataLength = length - (long int)2;

    subData = new char[dataLength];
    InputFile->read(subData, sizeof(unsigned char)*dataLength);
    subCRC = CM_Compute_CRC16(0, (BYTE*)subData, dataLength);

    //took the final CRC to compare it with the previous calculated CRC of the data
    InputFile->read(eventCRC, sizeof(eventCRC));
    readCRC = (((UINT16)(eventCRC[0]<<8))&0xFF00) + (((UINT16)eventCRC[1])&0x00FF);
    
    if (subCRC != readCRC) throw WrongCRCException(" Wrong CRC for VarDump Packet ");

    VarDumpRecord* rec;
    VarDump->Records->Clear();
    TClonesArray &recs = *(VarDump->Records);
    rec = new(recs[0]) VarDumpRecord(); //add a new TabDump
    vars = dataLength/4;
    rec->Data = new TArrayI(vars, (int*)subData);
    delete [] subData;
  }