[u/mrichter/AliRoot.git] / TPC / AliTPCBuffer160.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

/* $Id$ */

// Interface to the Altro format
// to read and write digits
// To be used in Alice Data Challenges 
// and in the compression of the RAW data
// Author: D.Favretto

#include "TObjArray.h"
#include "Riostream.h"
#include <stdlib.h>
#include "AliTPCBuffer160.h"
#include "TMath.h"

ClassImp(AliTPCBuffer160)

AliTPCBuffer160::AliTPCBuffer160(const char* fileName,Int_t flag){
  //if flag = 1 the actual object is used in the write mode
  //if flag = 0 the actual object is used in the read mode
  fFlag=flag;
  fCurrentCell=0;
  fMiniHeaderPos=0;
  fMaskBackward=0xFF;
  fVerbose=0;
  if (flag){
    fFreeCellBuffer=16;
    fShift=32; 
    //the buffer is cleaned 
    for (Int_t i=0;i<5;i++)fBuffer[i]=0;
    //open the output file
#ifndef __DECCXX
    f.open(fileName,ios::binary|ios::out);
#else
    f.open(fileName,ios::out);
#endif
  }
  else{
    //open the input file
#ifndef __DECCXX
    f.open(fileName,ios::binary|ios::in);
#else
    f.open(fileName,ios::in);
#endif
    if(!f){cout<<"File doesn't exist\n";exit(-1);}
    fShift=0;
    //To get the file dimension (position of the last element in term of bytes)
    f.seekg(0, ios::end);
    fFilePosition= f.tellg();
    fFileEnd=fFilePosition;
    f.seekg(0);
  }
}

AliTPCBuffer160::~AliTPCBuffer160(){
  // destructor
  if (fFlag){
    //Flush out the Buffer content at the end only if Buffer wasn't completely filled
    Flush();
    if(fVerbose)
      cout<<"File Created\n";
  }//end if
  f.close();
}


AliTPCBuffer160::AliTPCBuffer160(const AliTPCBuffer160 &source){
  // Copy Constructor
  if(&source==this)return;
  this->fShift=source.fShift;
  this->fCurrentCell=source.fCurrentCell;
  this->fFreeCellBuffer=source.fFreeCellBuffer;
  this->fFlag=source.fFlag;
  this->fMaskBackward=source.fMaskBackward;
  this->fFilePosition=source.fFilePosition;
  this->fMiniHeaderPos=source.fMiniHeaderPos;
  this->fVerbose=source.fVerbose;
  for (Int_t i=0;i<5;i++)this->fBuffer[i]=source.fBuffer[i];
  return;
}

AliTPCBuffer160& AliTPCBuffer160::operator=(const AliTPCBuffer160 &source){
  //Assigment operator
  if(&source==this)return *this;
  this->fShift=source.fShift;
  this->fCurrentCell=source.fCurrentCell;
  this->fFreeCellBuffer=source.fFreeCellBuffer;
  this->fFlag=source.fFlag;
  this->fMaskBackward=source.fMaskBackward;
  this->fFilePosition=source.fFilePosition;
  this->fMiniHeaderPos=source.fMiniHeaderPos;
  this->fVerbose=source.fVerbose;
  for (Int_t i=0;i<5;i++)this->fBuffer[i]=source.fBuffer[i];
  return *this;
}

Int_t AliTPCBuffer160::GetNext(){
  //It reads a 10 bits word in forward dicection from the Buffer.
  //A new Buffer is read from the file only when Buffer is empty.
  //If there aren't elements anymore -1 is returned otherwise 
  //the next element is returned
  ULong_t mask=0xFFC00000;
  ULong_t temp;
  ULong_t value;
  if (!fShift){
    if ( f.read((char*)fBuffer,sizeof(ULong_t)*5) ){
      fCurrentCell=0;
      fShift=22;
      value=fBuffer[fCurrentCell]&mask;
      value=value>>22;
      fBuffer[fCurrentCell]=fBuffer[fCurrentCell]<<10;
      return value;      
    }
    else return -1;
  }//end if
  else{
    if (fShift>=10){
      value=fBuffer[fCurrentCell]&mask;
      value=value>>22;
      fShift-=10;
      fBuffer[fCurrentCell]=fBuffer[fCurrentCell]<<10;
    }
    else{
      value=fBuffer[fCurrentCell]&mask;
      fCurrentCell++;
      temp=fBuffer[fCurrentCell];
      temp=temp>>fShift;
      temp=temp&mask;
      value=value|temp;
      value=value>>22;
      fBuffer[fCurrentCell]=fBuffer[fCurrentCell]<<(10-fShift);
      fShift=22+fShift;
    }
    return value;
  }//end else
}

Int_t AliTPCBuffer160::GetNextBackWord(){
  //It reads a 10 bits word in backward dicection from the Buffer.
  //A new Buffer is read from the file only when Buffer is empty.
  //If there aren't elements anymore -1 is returned otherwise 
  //the next element is returned
  ULong_t mask=0x3FF;
  ULong_t temp;
  ULong_t value;
  if (!fShift){
    if (fFilePosition){
      fFilePosition-=sizeof(ULong_t)*5;
      f.seekg(fFilePosition);
      f.read((char*)fBuffer,sizeof(ULong_t)*5);
      fCurrentCell=4;
      fShift=22;
      fMaskBackward=0xFF;
      value=fBuffer[fCurrentCell]&mask;
      fBuffer[fCurrentCell]=fBuffer[fCurrentCell]>>10;
      return value;      
    }
    else return -1;
  }//end if
  else{
    if (fShift>=10){
      value=fBuffer[fCurrentCell]&mask;
      fShift-=10;
      fBuffer[fCurrentCell]=fBuffer[fCurrentCell]>>10;
    }
    else{
      value=fBuffer[fCurrentCell];
      fCurrentCell--;
      temp=fBuffer[fCurrentCell]&mask;
      temp=temp&fMaskBackward;
      fMaskBackward=fMaskBackward>>2;
      temp=temp<<fShift;
      value=value|temp;
      fBuffer[fCurrentCell]=fBuffer[fCurrentCell]>>(10-fShift);
      fShift=22+fShift;
    }
    return value;
  }//end else
}

void AliTPCBuffer160::Flush(){
  // Flushes the Buffer content 
  if(fFreeCellBuffer!=16){
    Int_t temp=fFreeCellBuffer;
    for(Int_t i=0;i<temp;i++){
      FillBuffer(0x2AA);
    }//end for
  }//end if
}

void AliTPCBuffer160::FillBuffer(Int_t Val){
  //Fills the Buffer with 16 ten bits words and write into a file 
  fFreeCellBuffer--;
  if (fShift<10){
    Int_t temp=Val;
    Val=Val>>(10-fShift);
    fBuffer[fCurrentCell]|=Val;
    fCurrentCell++;
    fShift+=32;
    Val=temp;
  }
  fShift-=10;
  Val=Val<<fShift;
  fBuffer[fCurrentCell]|=Val;
  if(!fShift){
    //Buffer is written into a file
    f.write((char*)fBuffer,sizeof(ULong_t)*5);
   //Buffer is empty
    for(Int_t j=0;j<5;j++)fBuffer[j]=0;
    fShift=32;
    fCurrentCell=0;
    fFreeCellBuffer=16;
  }
  /*
    for(Int_t jj=0;jj<5;jj++){
    cout.flags(ios::hex);
    cout<<fBuffer[jj]<<endl;
    cout.flags(ios::dec);
    }
    
  */
  return;
}

void   AliTPCBuffer160::WriteTrailer(Int_t WordsNumber,Int_t PadNumber,Int_t RowNumber,Int_t SecNumber){
  //Writes a trailer of 40 bits
  Int_t num=fFreeCellBuffer%4;
  for(Int_t i=0;i<num;i++){
    FillBuffer(0x2AA);
  }//end for
  FillBuffer(WordsNumber);
  FillBuffer(PadNumber);
  FillBuffer(RowNumber);
  FillBuffer(SecNumber);
}

void AliTPCBuffer160::ReadTrailer(Int_t &WordsNumber,Int_t &PadNumber,Int_t &RowNumber,Int_t &SecNumber){
  //Read a trailer of 40 bits in the forward reading mode
  WordsNumber=GetNext();
  PadNumber=GetNext();
  RowNumber=GetNext();
  SecNumber=GetNext();
}


Int_t AliTPCBuffer160::ReadTrailerBackward(Int_t &WordsNumber,Int_t &PadNumber,Int_t &RowNumber,Int_t &SecNumber){
  //Read a trailer of 40 bits in the backward reading mode
  Int_t temp;
  fEndingFillWords=0;
  do{
    temp=GetNextBackWord();
    fEndingFillWords++;
    if (temp==-1)return -1;
  }while (temp==0x2AA);  
  fEndingFillWords--;
  SecNumber=temp;
  RowNumber=GetNextBackWord();
  PadNumber=GetNextBackWord();
  WordsNumber=GetNextBackWord();
  return 0;
} 

void AliTPCBuffer160::WriteMiniHeader(ULong_t Size,Int_t SecNumber,Int_t SubSector,Int_t Detector,Int_t Flag ){
  //Size msg errore sector number sub-sector number 0 for TPC 0 for uncompressed
  Int_t ddlNumber;
  ULong_t miniHeader[3];
  Int_t version=1;
  if(SecNumber<36)
    ddlNumber=SecNumber*2+SubSector;
  else
    ddlNumber=72+(SecNumber-36)*4+SubSector;
  //  cout<<"DDL number "<<ddlNumber<<endl;
  for(Int_t i=0;i<3;i++)miniHeader[i]=0;
  Int_t miniHeaderSize=(sizeof(ULong_t))*3;
  PackWord(miniHeader[1],Detector,0,7);
  PackWord(miniHeader[1],0x123456,8,31);
  PackWord(miniHeader[2],version,0,7);
  PackWord(miniHeader[2],Flag,8,15);
  PackWord(miniHeader[2],ddlNumber,16,31);
  if (!Size){
    //if size=0 it means that this mini header is a dummi mini header
    fMiniHeaderPos=f.tellp();
    //cout<<" Position of the DUMMY MH:"<<fMiniHeaderPos<<" Size:"<<Size<<endl;
    miniHeader[0]=Size;
    f.write((char*)(miniHeader),miniHeaderSize);
  }//end if
  else{
    ULong_t currentFilePos=f.tellp();
    f.seekp(fMiniHeaderPos);
    Size=currentFilePos-fMiniHeaderPos-miniHeaderSize;
    //cout<<"Current Position (Next MH) "<<currentFilePos<<" Position of the MH:"<<fMiniHeaderPos<<" Size:"<<Size<<endl;
    miniHeader[0]=Size;
    //cout<<"Mini Header Size:"<<miniHeader[0]<<endl;
    f.write((char*)(miniHeader),miniHeaderSize);
    f.seekp(currentFilePos);
  }
  return;
}


////////////////////////////////////////////////////////////////////////////////////////////////////////////////

void AliTPCBuffer160::PackWord(ULong_t &BaseWord, ULong_t Word, Int_t StartBit, Int_t StopBit){
  //Packs a word into the BaseWord buffer from StartBit bit up to StopBit bit
  ULong_t dummyWord,offSet;
  Int_t   length;
  ULong_t sum;
  //The BaseWord is being filled with 1 from StartBit to StopBit
  length=StopBit-StartBit+1;
  sum=(ULong_t)TMath::Power(2,length)-1;
  if(Word > sum){
    cout<<"WARNING::Word to be filled is not within desired length"<<endl;
    exit(-1);
  }
  offSet=sum;
  offSet<<=StartBit;
  BaseWord=BaseWord|offSet;
  //The Word to be filled is shifted to the position StartBit
  //and the remaining  Left and Right bits are filled with 1
  sum=(ULong_t)TMath::Power(2,StartBit)-1;
  dummyWord=0xFFFFFFFF<<length;
  dummyWord +=Word;
  dummyWord<<=StartBit;
  dummyWord+=sum;
  BaseWord=BaseWord&dummyWord;
  return;
}

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

void AliTPCBuffer160::UnpackWord(ULong_t PackedWord, Int_t StartBit, Int_t StopBit, ULong_t &Word){ 	
  //Unpacks a word of StopBit-StartBit+1 bits from PackedWord buffer starting from the position 
  //indicated by StartBit
  ULong_t offSet;
  Int_t length;
  length=StopBit-StartBit+1;
  offSet=(ULong_t)TMath::Power(2,length)-1;
  offSet<<=StartBit;
  Word=PackedWord&offSet;
  Word>>=StartBit;
  return;
}

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
Commit	Line	Data
2e9f335b	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
7c27857f	16	/* $Id$ */
	17
	18	// Interface to the Altro format
	19	// to read and write digits
a79660fb	20	// To be used in Alice Data Challenges
7c27857f	21	// and in the compression of the RAW data
	22	// Author: D.Favretto
	23
2e9f335b	24	#include "TObjArray.h"
	25	#include "Riostream.h"
	26	#include <stdlib.h>
	27	#include "AliTPCBuffer160.h"
0f0615a3	28	#include "TMath.h"
2e9f335b	29
	30	ClassImp(AliTPCBuffer160)
	31
	32	AliTPCBuffer160::AliTPCBuffer160(const char* fileName,Int_t flag){
	33	//if flag = 1 the actual object is used in the write mode
	34	//if flag = 0 the actual object is used in the read mode
	35	fFlag=flag;
	36	fCurrentCell=0;
	37	fMiniHeaderPos=0;
	38	fMaskBackward=0xFF;
	39	fVerbose=0;
	40	if (flag){
	41	fFreeCellBuffer=16;
	42	fShift=32;
	43	//the buffer is cleaned
	44	for (Int_t i=0;i<5;i++)fBuffer[i]=0;
	45	//open the output file
30c1018e	46	#ifndef __DECCXX
2e9f335b	47	f.open(fileName,ios::binary\|ios::out);
30c1018e	48	#else
	49	f.open(fileName,ios::out);
	50	#endif
2e9f335b	51	}
	52	else{
	53	//open the input file
30c1018e	54	#ifndef __DECCXX
2e9f335b	55	f.open(fileName,ios::binary\|ios::in);
30c1018e	56	#else
	57	f.open(fileName,ios::in);
	58	#endif
2e9f335b	59	if(!f){cout<<"File doesn't exist\n";exit(-1);}
	60	fShift=0;
	61	//To get the file dimension (position of the last element in term of bytes)
	62	f.seekg(0, ios::end);
	63	fFilePosition= f.tellg();
	64	fFileEnd=fFilePosition;
	65	f.seekg(0);
	66	}
	67	}
	68
	69	AliTPCBuffer160::~AliTPCBuffer160(){
7c27857f	70	// destructor
2e9f335b	71	if (fFlag){
a79660fb	72	//Flush out the Buffer content at the end only if Buffer wasn't completely filled
2e9f335b	73	Flush();
	74	if(fVerbose)
	75	cout<<"File Created\n";
	76	}//end if
	77	f.close();
	78	}
	79
	80
	81	AliTPCBuffer160::AliTPCBuffer160(const AliTPCBuffer160 &source){
	82	// Copy Constructor
	83	if(&source==this)return;
	84	this->fShift=source.fShift;
	85	this->fCurrentCell=source.fCurrentCell;
	86	this->fFreeCellBuffer=source.fFreeCellBuffer;
	87	this->fFlag=source.fFlag;
	88	this->fMaskBackward=source.fMaskBackward;
	89	this->fFilePosition=source.fFilePosition;
	90	this->fMiniHeaderPos=source.fMiniHeaderPos;
	91	this->fVerbose=source.fVerbose;
	92	for (Int_t i=0;i<5;i++)this->fBuffer[i]=source.fBuffer[i];
	93	return;
	94	}
	95
	96	AliTPCBuffer160& AliTPCBuffer160::operator=(const AliTPCBuffer160 &source){
	97	//Assigment operator
	98	if(&source==this)return *this;
	99	this->fShift=source.fShift;
	100	this->fCurrentCell=source.fCurrentCell;
	101	this->fFreeCellBuffer=source.fFreeCellBuffer;
	102	this->fFlag=source.fFlag;
	103	this->fMaskBackward=source.fMaskBackward;
	104	this->fFilePosition=source.fFilePosition;
	105	this->fMiniHeaderPos=source.fMiniHeaderPos;
	106	this->fVerbose=source.fVerbose;
	107	for (Int_t i=0;i<5;i++)this->fBuffer[i]=source.fBuffer[i];
	108	return *this;
	109	}
	110
	111	Int_t AliTPCBuffer160::GetNext(){
a79660fb	112	//It reads a 10 bits word in forward dicection from the Buffer.
a79660fb	113	//A new Buffer is read from the file only when Buffer is empty.
2e9f335b	114	//If there aren't elements anymore -1 is returned otherwise
2e9f335b	115	//the next element is returned
7c27857f	116	ULong_t mask=0xFFC00000;
2e9f335b	117	ULong_t temp;
7c27857f	118	ULong_t value;
2e9f335b	119	if (!fShift){
	120	if ( f.read((char)fBuffer,sizeof(ULong_t)5) ){
	121	fCurrentCell=0;
	122	fShift=22;
7c27857f	123	value=fBuffer[fCurrentCell]&mask;
7c27857f	124	value=value>>22;
2e9f335b	125	fBuffer[fCurrentCell]=fBuffer[fCurrentCell]<<10;
7c27857f	126	return value;
2e9f335b	127	}
	128	else return -1;
	129	}//end if
	130	else{
	131	if (fShift>=10){
7c27857f	132	value=fBuffer[fCurrentCell]&mask;
7c27857f	133	value=value>>22;
2e9f335b	134	fShift-=10;
	135	fBuffer[fCurrentCell]=fBuffer[fCurrentCell]<<10;
	136	}
	137	else{
7c27857f	138	value=fBuffer[fCurrentCell]&mask;
2e9f335b	139	fCurrentCell++;
	140	temp=fBuffer[fCurrentCell];
	141	temp=temp>>fShift;
7c27857f	142	temp=temp&mask;
	143	value=value\|temp;
	144	value=value>>22;
2e9f335b	145	fBuffer[fCurrentCell]=fBuffer[fCurrentCell]<<(10-fShift);
	146	fShift=22+fShift;
	147	}
7c27857f	148	return value;
2e9f335b	149	}//end else
	150	}
	151
	152	Int_t AliTPCBuffer160::GetNextBackWord(){
a79660fb	153	//It reads a 10 bits word in backward dicection from the Buffer.
a79660fb	154	//A new Buffer is read from the file only when Buffer is empty.
2e9f335b	155	//If there aren't elements anymore -1 is returned otherwise
2e9f335b	156	//the next element is returned
7c27857f	157	ULong_t mask=0x3FF;
2e9f335b	158	ULong_t temp;
7c27857f	159	ULong_t value;
2e9f335b	160	if (!fShift){
	161	if (fFilePosition){
	162	fFilePosition-=sizeof(ULong_t)*5;
	163	f.seekg(fFilePosition);
	164	f.read((char)fBuffer,sizeof(ULong_t)5);
	165	fCurrentCell=4;
	166	fShift=22;
	167	fMaskBackward=0xFF;
7c27857f	168	value=fBuffer[fCurrentCell]&mask;
2e9f335b	169	fBuffer[fCurrentCell]=fBuffer[fCurrentCell]>>10;
7c27857f	170	return value;
2e9f335b	171	}
	172	else return -1;
	173	}//end if
	174	else{
	175	if (fShift>=10){
7c27857f	176	value=fBuffer[fCurrentCell]&mask;
2e9f335b	177	fShift-=10;
	178	fBuffer[fCurrentCell]=fBuffer[fCurrentCell]>>10;
	179	}
	180	else{
7c27857f	181	value=fBuffer[fCurrentCell];
2e9f335b	182	fCurrentCell--;
7c27857f	183	temp=fBuffer[fCurrentCell]&mask;
2e9f335b	184	temp=temp&fMaskBackward;
	185	fMaskBackward=fMaskBackward>>2;
	186	temp=temp<<fShift;
7c27857f	187	value=value\|temp;
2e9f335b	188	fBuffer[fCurrentCell]=fBuffer[fCurrentCell]>>(10-fShift);
	189	fShift=22+fShift;
	190	}
7c27857f	191	return value;
2e9f335b	192	}//end else
	193	}
	194
	195	void AliTPCBuffer160::Flush(){
a79660fb	196	// Flushes the Buffer content
2e9f335b	197	if(fFreeCellBuffer!=16){
	198	Int_t temp=fFreeCellBuffer;
	199	for(Int_t i=0;i<temp;i++){
	200	FillBuffer(0x2AA);
	201	}//end for
	202	}//end if
	203	}
	204
	205	void AliTPCBuffer160::FillBuffer(Int_t Val){
a79660fb	206	//Fills the Buffer with 16 ten bits words and write into a file
2e9f335b	207	fFreeCellBuffer--;
	208	if (fShift<10){
	209	Int_t temp=Val;
	210	Val=Val>>(10-fShift);
	211	fBuffer[fCurrentCell]\|=Val;
	212	fCurrentCell++;
	213	fShift+=32;
	214	Val=temp;
	215	}
	216	fShift-=10;
	217	Val=Val<<fShift;
	218	fBuffer[fCurrentCell]\|=Val;
	219	if(!fShift){
	220	//Buffer is written into a file
	221	f.write((char)fBuffer,sizeof(ULong_t)5);
	222	//Buffer is empty
	223	for(Int_t j=0;j<5;j++)fBuffer[j]=0;
	224	fShift=32;
	225	fCurrentCell=0;
	226	fFreeCellBuffer=16;
	227	}
	228	/*
	229	for(Int_t jj=0;jj<5;jj++){
	230	cout.flags(ios::hex);
	231	cout<<fBuffer[jj]<<endl;
	232	cout.flags(ios::dec);
	233	}
	234
	235	*/
	236	return;
	237	}
	238
	239	void AliTPCBuffer160::WriteTrailer(Int_t WordsNumber,Int_t PadNumber,Int_t RowNumber,Int_t SecNumber){
a79660fb	240	//Writes a trailer of 40 bits
2e9f335b	241	Int_t num=fFreeCellBuffer%4;
	242	for(Int_t i=0;i<num;i++){
	243	FillBuffer(0x2AA);
	244	}//end for
	245	FillBuffer(WordsNumber);
	246	FillBuffer(PadNumber);
	247	FillBuffer(RowNumber);
	248	FillBuffer(SecNumber);
	249	}
	250
	251	void AliTPCBuffer160::ReadTrailer(Int_t &WordsNumber,Int_t &PadNumber,Int_t &RowNumber,Int_t &SecNumber){
a79660fb	252	//Read a trailer of 40 bits in the forward reading mode
2e9f335b	253	WordsNumber=GetNext();
	254	PadNumber=GetNext();
	255	RowNumber=GetNext();
	256	SecNumber=GetNext();
	257	}
	258
	259
	260	Int_t AliTPCBuffer160::ReadTrailerBackward(Int_t &WordsNumber,Int_t &PadNumber,Int_t &RowNumber,Int_t &SecNumber){
a79660fb	261	//Read a trailer of 40 bits in the backward reading mode
2e9f335b	262	Int_t temp;
7c27857f	263	fEndingFillWords=0;
2e9f335b	264	do{
2e9f335b	265	temp=GetNextBackWord();
7c27857f	266	fEndingFillWords++;
2e9f335b	267	if (temp==-1)return -1;
2e9f335b	268	}while (temp==0x2AA);
7c27857f	269	fEndingFillWords--;
2e9f335b	270	SecNumber=temp;
	271	RowNumber=GetNextBackWord();
	272	PadNumber=GetNextBackWord();
	273	WordsNumber=GetNextBackWord();
	274	return 0;
	275	}
	276
	277	void AliTPCBuffer160::WriteMiniHeader(ULong_t Size,Int_t SecNumber,Int_t SubSector,Int_t Detector,Int_t Flag ){
a79660fb	278	//Size msg errore sector number sub-sector number 0 for TPC 0 for uncompressed
7c27857f	279	Int_t ddlNumber;
	280	ULong_t miniHeader[3];
	281	Int_t version=1;
2e9f335b	282	if(SecNumber<36)
7c27857f	283	ddlNumber=SecNumber*2+SubSector;
2e9f335b	284	else
7c27857f	285	ddlNumber=72+(SecNumber-36)*4+SubSector;
	286	// cout<<"DDL number "<<ddlNumber<<endl;
	287	for(Int_t i=0;i<3;i++)miniHeader[i]=0;
	288	Int_t miniHeaderSize=(sizeof(ULong_t))*3;
	289	PackWord(miniHeader[1],Detector,0,7);
	290	PackWord(miniHeader[1],0x123456,8,31);
	291	PackWord(miniHeader[2],version,0,7);
	292	PackWord(miniHeader[2],Flag,8,15);
	293	PackWord(miniHeader[2],ddlNumber,16,31);
2e9f335b	294	if (!Size){
	295	//if size=0 it means that this mini header is a dummi mini header
	296	fMiniHeaderPos=f.tellp();
	297	//cout<<" Position of the DUMMY MH:"<<fMiniHeaderPos<<" Size:"<<Size<<endl;
7c27857f	298	miniHeader[0]=Size;
7c27857f	299	f.write((char*)(miniHeader),miniHeaderSize);
2e9f335b	300	}//end if
2e9f335b	301	else{
7c27857f	302	ULong_t currentFilePos=f.tellp();
2e9f335b	303	f.seekp(fMiniHeaderPos);
7c27857f	304	Size=currentFilePos-fMiniHeaderPos-miniHeaderSize;
	305	//cout<<"Current Position (Next MH) "<<currentFilePos<<" Position of the MH:"<<fMiniHeaderPos<<" Size:"<<Size<<endl;
	306	miniHeader[0]=Size;
	307	//cout<<"Mini Header Size:"<<miniHeader[0]<<endl;
	308	f.write((char*)(miniHeader),miniHeaderSize);
	309	f.seekp(currentFilePos);
2e9f335b	310	}
	311	return;
	312	}
	313
	314
	315	////////////////////////////////////////////////////////////////////////////////////////////////////////////////
	316
	317	void AliTPCBuffer160::PackWord(ULong_t &BaseWord, ULong_t Word, Int_t StartBit, Int_t StopBit){
a79660fb	318	//Packs a word into the BaseWord buffer from StartBit bit up to StopBit bit
7c27857f	319	ULong_t dummyWord,offSet;
	320	Int_t length;
	321	ULong_t sum;
2e9f335b	322	//The BaseWord is being filled with 1 from StartBit to StopBit
7c27857f	323	length=StopBit-StartBit+1;
	324	sum=(ULong_t)TMath::Power(2,length)-1;
	325	if(Word > sum){
2e9f335b	326	cout<<"WARNING::Word to be filled is not within desired length"<<endl;
	327	exit(-1);
	328	}
7c27857f	329	offSet=sum;
	330	offSet<<=StartBit;
	331	BaseWord=BaseWord\|offSet;
2e9f335b	332	//The Word to be filled is shifted to the position StartBit
2e9f335b	333	//and the remaining Left and Right bits are filled with 1
7c27857f	334	sum=(ULong_t)TMath::Power(2,StartBit)-1;
	335	dummyWord=0xFFFFFFFF<<length;
	336	dummyWord +=Word;
	337	dummyWord<<=StartBit;
	338	dummyWord+=sum;
	339	BaseWord=BaseWord&dummyWord;
2e9f335b	340	return;
	341	}
	342
	343	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
	344
	345	void AliTPCBuffer160::UnpackWord(ULong_t PackedWord, Int_t StartBit, Int_t StopBit, ULong_t &Word){
a79660fb	346	//Unpacks a word of StopBit-StartBit+1 bits from PackedWord buffer starting from the position
a79660fb	347	//indicated by StartBit
7c27857f	348	ULong_t offSet;
	349	Int_t length;
	350	length=StopBit-StartBit+1;
	351	offSet=(ULong_t)TMath::Power(2,length)-1;
	352	offSet<<=StartBit;
	353	Word=PackedWord&offSet;
2e9f335b	354	Word>>=StartBit;
	355	return;
	356	}
	357
	358	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////