source: Sophya/trunk/Poubelle/archTOI.old/archeopsfile.cc@ 2096

// archeopsfile.cc
// Eric Aubourg         CEA/DAPNIA/SPP   juillet 1999


#define utilitaires_de_block_archeops
#include "archeopsfile.h"

extern "C" {
#include "compress.h"
#include "arcunit.h"
}
#include <iostream.h>

// BlockSet is the current "state" of the file reader automate.
// It contains the last blocks of each kind, the current block and
// the look-ahead block.

class BlockSet {
public:
  BlockSet();
  BlockSet(BlockSet const&);
  ~BlockSet();
  void setBloc(block_type_modele const& blk);
  void setRawBloc(block_type_modele const& blk);

  block_type_param*         lastParam;
  block_type_journal*       lastJournal;
  block_type_reglage*       lastReglage;
  block_type_dilution*      lastDilution;
  block_type_gps*           lastGPS;
  block_type_une_periode*   lastUnePeriode;
  block_type_synchro_sol*   lastSynchroSol;
  block_type_pointage_sol*  lastPointageSol;
  block_type_bolo*          lastBolo;   // can be uncompressed bolo_comp
  block_type_bolo*          llastBolo;   
  block_type_gyro*          lastGyro;
  block_type_sst*           lastSST;
  block_type_bolo_comprime* lastBoloComp;   // can be uncompressed bolo_comp
  block_type_gyro_comprime* lastGyroComp;
  block_type_sst_comprime*  lastSSTComp;
    
  block_type_modele         curBlock;
  block_type_modele         peekBlock;
};

BlockSet::BlockSet() {
  lastParam      = NULL;
  lastJournal    = NULL;
  lastReglage    = NULL;
  lastDilution   = NULL;
  lastGPS        = NULL;
  lastUnePeriode = NULL;
  lastSynchroSol = NULL;
  lastPointageSol= NULL;
  lastBolo       = NULL;   
  llastBolo      = NULL;   
  lastGyro       = NULL;
  lastSST        = NULL;
  lastBoloComp   = NULL;   
  lastGyroComp   = NULL;
  lastSSTComp    = NULL;
  
  memset(&curBlock,0,sizeof(block_type_modele));
  memset(&peekBlock,0,sizeof(block_type_modele));
}

BlockSet::~BlockSet() {
  delete lastParam;
  delete lastJournal;
  delete lastReglage;
  delete lastDilution;
  delete lastGPS;
  delete lastUnePeriode;
  delete lastSynchroSol;
  delete lastPointageSol;
  delete lastBolo;   
  delete llastBolo;   
  delete lastGyro;
  delete lastSST;
  delete lastBoloComp;   
  delete lastGyroComp;
  delete lastSSTComp;
}

BlockSet::BlockSet(BlockSet const& x) 
{
  lastParam      = NULL;
  lastJournal    = NULL;
  lastReglage    = NULL;
  lastDilution   = NULL;
  lastGPS        = NULL;
  lastUnePeriode = NULL;
  lastSynchroSol = NULL;
  lastPointageSol= NULL;
  lastBolo       = NULL;   
  llastBolo      = NULL;   
  lastGyro       = NULL;
  lastSST        = NULL;
  lastBoloComp   = NULL;   
  lastGyroComp   = NULL;
  lastSSTComp    = NULL;
  
  if (x.lastParam) {
    lastParam = new block_type_param;
    *lastParam = *x.lastParam;
  }
  if (x.lastJournal) {
    lastJournal = new block_type_journal;
    *lastJournal = *x.lastJournal;
  }
  if (x.lastReglage) {
    lastReglage = new block_type_reglage;
    *lastReglage = *x.lastReglage;
  }
  if (x.lastDilution) {
    lastDilution = new block_type_dilution;
    *lastDilution = *x.lastDilution;
  }
  if (x.lastGPS) {
    lastGPS = new block_type_gps;
    *lastGPS = *x.lastGPS;
  }
  if (x.lastUnePeriode) {
    lastUnePeriode = new block_type_une_periode;
    *lastUnePeriode = *x.lastUnePeriode;
  }
  if (x.lastSynchroSol) {
    lastSynchroSol = new block_type_synchro_sol;
    *lastSynchroSol = *x.lastSynchroSol;
  }
  if (x.lastPointageSol) {
    lastPointageSol = new block_type_pointage_sol;
    *lastPointageSol = *x.lastPointageSol;
  }
  if (x.lastBolo) {
    lastBolo = new block_type_bolo;
    *lastBolo = *x.lastBolo;
  }
  if (x.llastBolo) {
    llastBolo = new block_type_bolo;
    *llastBolo = *x.llastBolo;
  }
  if (x.lastGyro) {
    lastGyro = new block_type_gyro;
    *lastGyro = *x.lastGyro;
  }
  if (x.lastSST) {
    lastSST = new block_type_sst;
    *lastSST = *x.lastSST;
  }
  if (x.lastBoloComp) {
    lastBoloComp = new block_type_bolo_comprime;
    *lastBoloComp = *x.lastBoloComp;
  }
  if (x.lastGyroComp) {
    lastGyroComp = new block_type_gyro_comprime;
    *lastGyroComp = *x.lastGyroComp;
  }
  if (x.lastSSTComp) {
    lastSSTComp = new block_type_sst_comprime;
    *lastSSTComp = *x.lastSSTComp;
  }
  
  memcpy(&curBlock,&x.curBlock,sizeof(block_type_modele));
  memcpy(&peekBlock,&x.peekBlock,sizeof(block_type_modele));

}

void BlockSet::setBloc(block_type_modele const& blk)
{
  int kind = type_block(&blk);
  switch (kind) {
    case block_param:
      if (!lastParam) lastParam = new block_type_param;
      memcpy(lastParam, &blk, sizeof(block_type_param));
      // Les fichiers fournis contiennent des valeurs debiles...
      if (lastParam->param.n_max_bolo < 0)
        lastParam->param.n_max_bolo = nb_max_bolo;
      if (lastParam->param.n_per_block < 0)
        lastParam->param.n_per_block = nb_per_block;
      if (lastParam->param.n_max_mes_per < 0)
        lastParam->param.n_max_mes_per = nb_max_mes_per;
      break;
    case block_journal:
      if (!lastJournal) lastJournal = new block_type_journal;
      memcpy(lastJournal, &blk, sizeof(block_type_journal));
      break;
    case block_reglage:
      if (!lastReglage) lastReglage = new block_type_reglage;
      memcpy(lastReglage, &blk, sizeof(block_type_reglage));
      break;
    case block_dilution:
      if (!lastDilution) lastDilution = new block_type_dilution;
      memcpy(lastDilution, &blk, sizeof(block_type_dilution));
      break;
    case block_gps:
      if (!lastGPS) lastGPS = new block_type_gps;
      memcpy(lastGPS, &blk, sizeof(block_type_gps));
      break;
    case block_une_periode:
      if (!lastUnePeriode) lastUnePeriode = new block_type_une_periode;
      memcpy(lastUnePeriode, &blk, sizeof(block_type_une_periode));
      break;
    case block_synchro_sol:
      if (!lastSynchroSol) lastSynchroSol = new block_type_synchro_sol;
      memcpy(lastSynchroSol, &blk, sizeof(block_type_synchro_sol));
      break;
    case block_pointage_sol:
      if (!lastPointageSol) lastPointageSol = new block_type_pointage_sol;
      memcpy(lastPointageSol, &blk, sizeof(block_type_pointage_sol));
      break;
    case block_bolo:
      if (!lastBolo) lastBolo = new block_type_bolo;
      else if (!llastBolo) {
        llastBolo = new block_type_bolo;
      }
      if (llastBolo) {
        memcpy(llastBolo, lastBolo, sizeof(block_type_bolo));
      }
      memcpy(lastBolo, &blk, sizeof(block_type_bolo));
      break;
    case block_gyro:
      if (!lastGyro) lastGyro = new block_type_gyro;
      memcpy(lastGyro, &blk, sizeof(block_type_gyro));
      break;
    case block_sst:
      if (!lastSST) lastSST = new block_type_sst;
      memcpy(lastSST, &blk, sizeof(block_type_sst));
      break;
  }
}

void BlockSet::setRawBloc(block_type_modele const& blk)
{
  int kind = type_block(&blk);
  switch (kind) {
    case block_bolo_comprime:
      if (!lastBoloComp) lastBoloComp = new block_type_bolo_comprime;
      memcpy(lastBoloComp, &blk, sizeof(block_type_bolo_comprime));
      break;
    case block_gyro_comprime:
      if (!lastGyroComp) lastGyroComp = new block_type_gyro_comprime;
      memcpy(lastGyroComp, &blk, sizeof(block_type_gyro_comprime));
      break;
    case block_sst_comprime:
      if (!lastSSTComp) lastSSTComp = new block_type_sst_comprime;
      memcpy(lastSSTComp, &blk, sizeof(block_type_sst_comprime));
      break;
  }
}

#ifdef __MWERKS__
#pragma mark -
#endif
#ifdef __MWERKS__
#pragma mark -
#endif


ArcheopsFile::ArcheopsFile(string const& fname) {
  f = fopen(fname.c_str(), "rb");
  setvbuf(f, NULL, _IOFBF, 1024L*1024L);

  fn = fname;
  if (!f) throw ArchExc("file not found");
  fseek(f,0,SEEK_END);
  fLen = ftell(f);
  curPos = -1;
  peekPos = -1;
  curKind = -1;
  curRawKind = -1;
  blockSet = new BlockSet;
  utcOffset=2;
  computeMJD(fname);
}

ArcheopsFile::ArcheopsFile(ArcheopsFile const& x) {
  blockSet = x.blockSet ? new BlockSet(*x.blockSet) : NULL;
  fposStack = x.fposStack;
  
  stack<BlockSet*> tmp;
  ArcheopsFile& y = (ArcheopsFile&) x;
  while (!y.blockStack.empty()) {
    tmp.push(y.blockStack.top());
    y.blockStack.pop();
  }
  while (!tmp.empty()) {
    y.blockStack.push(tmp.top());
    blockStack.push(new BlockSet(*tmp.top()));
    tmp.pop();
  }

  //curBlock   = x.curBlock;
  curKind    = x.curKind;
  curRawKind = x.curRawKind;
  curPos     = x.curPos;
  peekPos    = x.peekPos;
  fLen       = x.fLen;
  fn         = x.fn;
  f = fopen(fn.c_str(), "rb");
  setvbuf(f, NULL, _IOFBF, 1024L*1024L);

  rawMJD     = x.rawMJD;
  startMJD   = x.startMJD;
  utcOffset  = x.utcOffset;
}

ArcheopsFile::~ArcheopsFile() {
  if (f) fclose(f);
  delete blockSet;
  while (!blockStack.empty())
    { delete blockStack.top(); blockStack.pop();}
}

void ArcheopsFile::grabLastBlocs(ArcheopsFile const& oldFile) {
  delete blockSet;
  blockSet = new BlockSet(*oldFile.blockSet);
  //curBlock = oldFile.curBlock;
  //peekBlock = oldFile.peekBlock;
  if (peekPos>0) peekPos = 0;
  setUTCOffset(oldFile.utcOffset);
}


def_nom_block

def_long_block

bool ArcheopsFile::nextBlock() {
  // si pas de peek, alors en lire un pour commencer...
  if (peekPos<0) {
    peekPos=0; if (!nextBlock()) return false;
  }
  block_type_modele* curBlock=currentBlock();
  block_type_modele* peekBlock=aheadBlock();
  
  memcpy(curBlock, peekBlock, sizeof(block_type_modele));
  curPos = peekPos;
  
  while (true) {
    if (peekPos+12 > fLen) return false;  // fin de fichier
    fseek(f,peekPos,SEEK_SET);            // aller en peekPos
    size_t read = fread(peekBlock,1,sizeof(block_type_modele),f);
    swapEntete(peekBlock);
    if (read < longueur_block(peekBlock) || 
        type_block(peekBlock) < 0 || type_block(peekBlock) > 19 ||
        longueur_block(peekBlock) != long_block[type_block(peekBlock)]) {
      cout << "invalid block, bad type or length" << endl;
      //cout << "addr = " << peekPos << endl;
      memset(peekBlock, 0, sizeof(block_type_modele)); // don't keep trash...
      peekPos = searchNextBlock(peekPos);
      if (peekPos<0) return false;
      continue;
    }
    swapContent(peekBlock);
    if (verifie_block(peekBlock) != block_correct) {
      cout << "invalid block " << numero_block(peekBlock);
      if (!fixBlock(peekBlock)) {
        cout << " -- skipped" << endl;
        peekPos += longueur_block(peekBlock);  // la longueur doit etre ok...
        continue;
      } else {
        cout << " -- fixed" << endl;
        break;
      }
    }
    break; // tout semble bon pour ce bloc...
  }
  
  peekPos += longueur_block(peekBlock); // on suppose que longueur OK...
  if (curPos < 0) {
    curPos = 0; return true;
  }
  if (curBlock->debut != 0) {
    curRawKind = curKind = type_block(curBlock);
    postProcessBlock();
    saveCurBlock();
  } else {
    curRawKind = curKind = -1;
  }
  return true;
}

bool ArcheopsFile::nextBlock(long mask) {
  if (!mask) return false;
  while (1) {
    if (!nextBlock()) return false;
    if (( 1 << curRawKind) & mask) return true;
  }
}

bool ArcheopsFile::fixBlock(block_type_modele* ) {
  return false;
}


int  ArcheopsFile::blockKind() {
  return curKind;
}

int  ArcheopsFile::blockRawKind() {
  return curRawKind;
}

int  ArcheopsFile::blockNum() {
  return numero_block(currentBlock());
}


string  ArcheopsFile::blockKdName() {
  return nom_block[curKind];
}

string  ArcheopsFile::blockRawKdName() {
  return nom_block[curRawKind];
}


block_type_modele*  ArcheopsFile::currentBlock() {
  //if (curPos<0) return NULL;
  return &blockSet->curBlock;
}

block_type_modele*  ArcheopsFile::aheadBlock() {
  //if (peekPos<0) return NULL;
  return &blockSet->peekBlock;
}

bool ArcheopsFile::sameBlockNumAhead() {
  if (curPos<0) return false;
  return (numero_block(&blockSet->curBlock) == numero_block(&blockSet->peekBlock));
}

void ArcheopsFile::forceBlock(block_type_modele* blk) {
  blockSet->setBloc(*blk);
}


#ifdef __DECCXX
#define SWAP
#endif
#if ((defined(Linux)  || defined(linux)) && !defined(powerpc))
#define SWAP
#endif


typedef unsigned int4 uint_4;
typedef unsigned short uint_2;

static inline void bswap4(void* p)
{
  uint_4 tmp = *(uint_4*)p;
  *(uint_4*)p = ((tmp >> 24) & 0x000000FF) | 
                ((tmp >> 8)  & 0x0000FF00) |
                ((tmp & 0x0000FF00) << 8)  |
                ((tmp & 0x000000FF) << 24);
}

static inline void bswap2(void* p)
{
  uint_2 tmp = *(uint_2*)p;
  *(uint_2*)p = ((tmp >> 8) & 0x00FF) | 
                ((tmp & 0x00FF) << 8);
}


long ArcheopsFile::searchNextBlock(long pos) {
  static char* buffer = 0;
  static int4  debswp = debut_block_mesure;
  static long  longmax = taille_maxi_block_archeops*20; 
  if (!buffer) {
    buffer = new char[longmax];
#ifdef SWAP
    bswap4(&debswp);
#endif
  }
  //printf("searchNext %o len = %d value = %x \n", pos, longmax, debswp);
  long read = longmax;
  while (read == longmax) {
    fseek(f,pos,SEEK_SET);
    read = fread(buffer,1,longmax,f);
    //if (read<taille_maxi_block_archeops*2) return -1; 
    // EA 150999 changed i+=4 to i++ -> unaligned, but can lose bytes in flight recorder
#ifndef __DECCXX
#define __unaligned 
#endif
     for (long i=4; i<read; i++) {
       // printf("%o %x\n", pos+i, *(__unaligned int4*)(buffer+i));
      if (*(__unaligned int4*)(buffer+i) == debswp) {
        cout << "trying to skip " << i << " bytes to pos="<<pos+i << endl;
            return pos+i;
      }
    }
    pos += read;
  }
  cout << "cannot find block start" << endl;
  return -1;
}

#define place_paquet(i,j)        ((i/8) * 24  + j*8 + (i%8) )

void ArcheopsFile::postProcessBlock() {
  switch (curKind) {
     case block_bolo_comprime: {
       blockSet->setRawBloc(blockSet->curBlock);
       block_type_bolo blk2;
       block_type_bolo_comprime* blk = (block_type_bolo_comprime*) &blockSet->curBlock;
       #if version_num <= 25
       for(int j=0;j<nb_bolo_util;j++)  
           {
                   decompress_7_2((int4*)blk->data_bolo[j],blk2.data_bolo[j],nb_per_block*2);
           }
           #else
           block_type_param* param = lastParam();
           if (!param) return;
           int jc=0;for(int j=0;j<nb_max_bolo;j++)       // jc = bolo_comprime  //   j=bolo normal
           {
                if( (param->param.bolo[j].bolo_code_util==bolo_normal_transmis) &&  (jc<nb_bolo_util)  )
                        {
                        decompress_7_2((int4 *)blk->data_bolo[jc],blk2.data_bolo[j],nb_per_block*2);
                        jc++;
                        }
                else {
                  memset(blk2.data_bolo[j], 0, nb_per_block*2*sizeof(int4));
                }
                }

           #endif
       valide_block((block_type_modele*)&blk2,block_bolo,numero_block(blk));    
       memcpy(&blockSet->curBlock,&blk2,sizeof(blk2));
       curKind = block_bolo;
       postProcessBlock();
       break;
     }
     case block_sst_comprime: {  
       blockSet->setRawBloc(blockSet->curBlock);
       block_type_sst blk2;
       block_type_sst_comprime* blk = (block_type_sst_comprime*) &blockSet->curBlock;
       for (int j=0; j<18; j++)
         for (int i=0; i<nb_per_block*2; i++)
           blk2.sst[i][j] = 0;

       int jc=0;
       for( int j=0;j<48;j++) {
         if ((j!=0) && (j!=4)) 
         {
           unsigned int4 sst_vrai[nb_per_block*2];
           decompress_4_1((int4*)blk->sst[jc],(int4*)sst_vrai,nb_per_block*2);
           for (int k=0;k<nb_per_block*2;k++) {
             unsigned int4 a,b0,b1,b2;
             b2 = sst_vrai[k] & 0xf;
             b1 = (sst_vrai[k] >> 4) & 0xf;
             b0 = (sst_vrai[k] >> 8) & 0xf;
                 a=place_paquet(j,0);
                 blk2.sst[k][a/8] |= (b0 << (a%8)*4);
                 a=place_paquet(j,1);
                 blk2.sst[k][a/8] |= (b1 << (a%8)*4);
                 a=place_paquet(j,2);
                 blk2.sst[k][a/8] |= (b2 << (a%8)*4);
           }
           jc++;
         }
       }       
       valide_block((block_type_modele*)&blk2,block_sst,numero_block(blk));     
       memcpy(&blockSet->curBlock,&blk2,sizeof(blk2));
       curKind = block_sst;
       postProcessBlock();
       break;
     }
// Delegation a tous les producers qui traitent des blocs bruts
  }
}



#ifdef __MWERKS__
#pragma mark -
#endif

block_type_param* ArcheopsFile::lastParam() {
  return blockSet->lastParam;
}
block_type_journal* ArcheopsFile::lastJournal() {
  return blockSet->lastJournal;
}
block_type_reglage* ArcheopsFile::lastReglage() {
  return blockSet->lastReglage;
}
block_type_dilution* ArcheopsFile::lastDilution() {
  return blockSet->lastDilution;
}
block_type_gps* ArcheopsFile::lastGPS() {
  return blockSet->lastGPS;
}
block_type_une_periode* ArcheopsFile::lastUnePeriode() {
  return blockSet->lastUnePeriode;
}
block_type_synchro_sol* ArcheopsFile::lastSynchroSol() {
  return blockSet->lastSynchroSol;
}
block_type_pointage_sol* ArcheopsFile::lastPointageSol() {
  return blockSet->lastPointageSol;
}
block_type_bolo* ArcheopsFile::lastBolo() {
  return blockSet->lastBolo;
} 
block_type_bolo* ArcheopsFile::llastBolo() {
  return blockSet->llastBolo;
} 
block_type_gyro* ArcheopsFile::lastGyro() {
  return blockSet->lastGyro;
}
block_type_sst* ArcheopsFile::lastSST() {
  return blockSet->lastSST;
}
block_type_bolo_comprime* ArcheopsFile::lastBoloComp() {
  return blockSet->lastBoloComp;
} 
block_type_gyro_comprime* ArcheopsFile::lastGyroComp() {
  return blockSet->lastGyroComp;
}
block_type_sst_comprime* ArcheopsFile::lastSSTComp() {
  return blockSet->lastSSTComp;
}

#ifdef __MWERKS__
#pragma mark -
#endif



void ArcheopsFile::saveCurBlock() {
  blockSet->setBloc(blockSet->curBlock);
}

void ArcheopsFile::pushMark() {    // push current file position, and "last" blocks
  fposStack.push(curPos);
  fposStack.push(peekPos);
  blockStack.push(new BlockSet(*blockSet));
}

void ArcheopsFile::popMark() {    // pops last file position and "last" blocks
  if (! blockStack.empty()) {
    delete blockSet;
    blockSet = blockStack.top();
    blockStack.pop();
    peekPos = fposStack.top();
    fposStack.pop();
    curPos = fposStack.top();
    fposStack.pop();
  }
}

#ifdef SWAP
void ArcheopsFile::swapEntete(block_type_modele* blk) {
  bswap4(&(blk->debut));
  bswap4(&(blk->code1));
  bswap4(&(blk->code2));
  long lg = longueur_block(blk);
  if (lg < taille_maxi_block_archeops)
    bswap4(((char*)blk) + lg - 4);
}
#else
void ArcheopsFile::swapEntete(block_type_modele* ) {
}
#endif

#ifdef SWAP
void ArcheopsFile::swapContent(block_type_modele* blk) {
  int typ = type_block(blk);

  if (typ == block_gps) return; // char only, no swap
  if (typ == block_une_periode) { // une_periode, des shorts
    block_type_une_periode* b = (block_type_une_periode*) blk;
    for (int i=0; i<nb_max_bolo; i++)
      for (int j=0; j<nb_max_mes_per; j++)
        bswap2(&b->bol_per[i][j]);
    return;
  }

  for (int i=0; i<longueur_block(blk)/4-4; i++)
    bswap4(blk->mot + i);
  // On deswappe ce qui ne devait pas etre swappe...
  switch (typ) {
  case block_param: {
    block_type_param* b = (block_type_param*) blk;
    for (int i=0; i<nb_max_bolo; i++)
      for (int j=0; j<8; j++)
#if version_num<=25
        bswap4(&b->param.bolo[i].bolo_nom[4*j]);
#else
        bswap4(&b->param.nom_coef[i].bolo_nom[4*j]);
#endif
  }
  
  }
}
#else
void ArcheopsFile::swapContent(block_type_modele* ) {
}
#endif

#ifdef __MWERKS__
#pragma mark -
#endif


static int mlen[] = {31,28,31,30,31,30,31,31,30,31,30,31};

double ArcheopsFile::decodeMJD(string const& dateString) {
  //99_04_29-15h36m22  ou  99_05_10
  short y,m,d,hh,mm,ss;
  char const* p = dateString.c_str();
  char const* p2 = dateString.c_str() + dateString.length();
  y  = atoi(p); p+=3; if (p>p2) return -1;
  m  = atoi(p); p+=3; if (p>p2) return -1;
  d  = atoi(p); p+=3;
  if (p<p2) {
  hh = atoi(p); p+=3; if (p>p2) return -1;
  mm = atoi(p); p+=3; if (p>p2) return -1;
  ss = atoi(p);
  } else {
    hh=mm=ss=0;
  }

  if (y<50) y += 100;
  // 1. depuis 0/1/97 minuit
  double mjd = (int) (365.25 * (y-97));
  for (int i=0; i<m-1; i++)
    mjd += mlen[i];
  if (y%4 == 0 && m > 2) mjd++;
  mjd += d;
  mjd += hh/24. + mm/24./60. + ss/24./60./60;
  
  mjd += 448.5; // 0/1/97 minuit

  return mjd;
}

void ArcheopsFile::computeMJD(string const& fname) {
  //telemetrie : h99_04_29-15h36m22
  //enregistreur : ARKxxxxxx.dat, et MJD = samedi 17 juillet, 21h -> 1377.4
  char const* p = fname.c_str();
  char const* p2 = p  + fname.length()-1;
  while (*p2 != ':' && *p2 != '/' && p2 != p) p2--;
  if (*p2 == ':' || *p2 == '/') p2++;
  if (*p2 == 'h') p2++;
  if (!strncmp(p2, "ARK",3) || !strncmp(p2,"ark",3)) {
    rawMJD = 1377.4;
  } else {
    rawMJD = decodeMJD(p2);
  }
  startMJD = rawMJD - utcOffset/24.;
}

void ArcheopsFile::setUTCOffset(double UTCOffset) {
  utcOffset = UTCOffset;
  startMJD = rawMJD - utcOffset/24.;
}

double ArcheopsFile::getStartMJD() {
  return startMJD;
}