[u/mrichter/AliRoot.git] / RAW / AliRawReaderRoot.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.                  *
 **************************************************************************/

/* $Id$ */

///////////////////////////////////////////////////////////////////////////////
///
/// This is a class for reading raw data from a root file.
///
/// The root file is expected to contain a tree of name "RAW" with
/// a branch of name "rawevent" which contains objects of type
/// AliRawEvent.
/// 
/// The file name and the event number are arguments of the constructor
/// of AliRawReaderRoot.
///
///////////////////////////////////////////////////////////////////////////////

#include <TFile.h>
#include <TTree.h>
#include "AliRawReaderRoot.h"
#include "AliRawEvent.h"
#include "AliRawEventHeader.h"
#include "AliRawEquipmentHeader.h"
#include "AliRawData.h"


ClassImp(AliRawReaderRoot)


AliRawReaderRoot::AliRawReaderRoot(const char* fileName, Int_t eventNumber) :
  fFile(NULL),
  fBranch(NULL),
  fEventIndex(eventNumber),
  fEvent(NULL),
  fSubEventIndex(0),
  fSubEvent(NULL),
  fRawData(NULL),
  fPosition(NULL),
  fEnd(NULL)
{
// create an object to read digits from the given input file for the
// event with the given number

  TDirectory* dir = gDirectory;
  fFile = TFile::Open(fileName);
  dir->cd();
  if (!fFile || !fFile->IsOpen()) {
    Error("AliRawReaderRoot", "could not open file %s", fileName);
    return;
  }
  TTree* tree = (TTree*) fFile->Get("RAW");
  if (!tree) {
    Error("AliRawReaderRoot", "no raw data tree found");
    return;
  }
  fBranch = tree->GetBranch("rawevent");
  if (!fBranch) {
    Error("AliRawReaderRoot", "no raw data branch found");
    return;
  }

  fEvent = new AliRawEvent;
  fBranch->SetAddress(&fEvent);
  if (fEventIndex >= 0) {
    if (fBranch->GetEntry(fEventIndex) <= 0) {
      Error("AliRawReaderRoot", "no event with number %d found", fEventIndex);
      return;
    }
  }
}

AliRawReaderRoot::AliRawReaderRoot(AliRawEvent* event) :
  fFile(NULL),
  fBranch(NULL),
  fEventIndex(-1),
  fEvent(event),
  fSubEventIndex(0),
  fSubEvent(NULL),
  fRawData(NULL),
  fPosition(NULL),
  fEnd(NULL)
{
// create an object to read digits from the given raw event

}

AliRawReaderRoot::AliRawReaderRoot(const AliRawReaderRoot& rawReader) :
  AliRawReader(rawReader),
  fFile(NULL),
  fBranch(NULL),
  fEventIndex(rawReader.fEventIndex),
  fEvent(NULL),
  fSubEventIndex(rawReader.fSubEventIndex),
  fSubEvent(NULL),
  fRawData(NULL),
  fPosition(NULL),
  fEnd(NULL)
{
// copy constructor

  if (rawReader.fFile) {
    TDirectory* dir = gDirectory;
    fFile = TFile::Open(rawReader.fFile->GetName());
    dir->cd();
    if (!fFile || !fFile->IsOpen()) {
      Error("AliRawReaderRoot", "could not open file %s", 
	    rawReader.fFile->GetName());
      return;
    }
    TTree* tree = (TTree*) fFile->Get("RAW");
    if (!tree) {
      Error("AliRawReaderRoot", "no raw data tree found");
      return;
    }
    fBranch = tree->GetBranch("rawevent");
    if (!fBranch) {
      Error("AliRawReaderRoot", "no raw data branch found");
      return;
    }

    fEvent = new AliRawEvent;
    fBranch->SetAddress(&fEvent);
    if (fEventIndex >= 0) {
      if (fBranch->GetEntry(fEventIndex) <= 0) {
	Error("AliRawReaderRoot", "no event with number %d found", 
	      fEventIndex);
	return;
      }
    }
  } else {
    fEvent = rawReader.fEvent;
  }

  if (fSubEventIndex > 0) {
    fSubEvent = fEvent->GetSubEvent(fSubEventIndex-1);
    fRawData = fSubEvent->GetRawData();
      fCount = 0;
    fHeader = (AliRawDataHeader*) ((UChar_t*) fRawData->GetBuffer() + 
      ((UChar_t*) rawReader.fHeader - 
       (UChar_t*) rawReader.fRawData->GetBuffer()));
    fPosition = (UChar_t*) fRawData->GetBuffer() + 
      (rawReader.fPosition - (UChar_t*) rawReader.fRawData->GetBuffer());
    fEnd = ((UChar_t*) fRawData->GetBuffer()) + fRawData->GetSize();
  }
}

AliRawReaderRoot& AliRawReaderRoot::operator = (const AliRawReaderRoot& 
						rawReader)
{
// assignment operator

  this->~AliRawReaderRoot();
  new(this) AliRawReaderRoot(rawReader);
  return *this;
}

AliRawReaderRoot::~AliRawReaderRoot()
{
// delete objects and close root file

  if (fFile) {
    if (fEvent) delete fEvent;
    fFile->Close();
    delete fFile;
  }
}


UInt_t AliRawReaderRoot::GetType() const
{
// get the type from the event header

  if (!fEvent) return 0;
  return fEvent->GetHeader()->GetType();
}

UInt_t AliRawReaderRoot::GetRunNumber() const
{
// get the run number from the event header

  if (!fEvent) return 0;
  return fEvent->GetHeader()->GetRunNumber();
}

const UInt_t* AliRawReaderRoot::GetEventId() const
{
// get the event id from the event header

  if (!fEvent) return NULL;
  return fEvent->GetHeader()->GetId();
}

const UInt_t* AliRawReaderRoot::GetTriggerPattern() const
{
// get the trigger pattern from the event header

  if (!fEvent) return NULL;
  return fEvent->GetHeader()->GetTriggerPattern();
}

const UInt_t* AliRawReaderRoot::GetDetectorPattern() const
{
// get the detector pattern from the event header

  if (!fEvent) return NULL;
  return fEvent->GetHeader()->GetDetectorPattern();
}

const UInt_t* AliRawReaderRoot::GetAttributes() const
{
// get the type attributes from the event header

  if (!fEvent) return NULL;
  return fEvent->GetHeader()->GetTypeAttribute();
}

UInt_t AliRawReaderRoot::GetLDCId() const
{
// get the LDC Id from the event header

  if (!fEvent || !fEvent->GetSubEvent(fSubEventIndex)) return 0;
  return fEvent->GetSubEvent(fSubEventIndex)->GetHeader()->GetLDCId();
}

UInt_t AliRawReaderRoot::GetGDCId() const
{
// get the GDC Id from the event header

  if (!fEvent) return 0;
  return fEvent->GetHeader()->GetGDCId();
}


Int_t AliRawReaderRoot::GetEquipmentSize() const
{
// get the size of the equipment

  if (!fEvent || !fEvent->GetEquipmentHeader()) return 0;
  return fEvent->GetEquipmentHeader()->GetEquipmentSize();
}

Int_t AliRawReaderRoot::GetEquipmentType() const
{
// get the type from the equipment header

  if (!fEvent || !fEvent->GetEquipmentHeader()) return -1;
  return fEvent->GetEquipmentHeader()->GetEquipmentType();
}

Int_t AliRawReaderRoot::GetEquipmentId() const
{
// get the ID from the equipment header

  if (!fEvent || !fEvent->GetEquipmentHeader()) return -1;
  return fEvent->GetEquipmentHeader()->GetId();
}

const UInt_t* AliRawReaderRoot::GetEquipmentAttributes() const
{
// get the attributes from the equipment header

  if (!fEvent || !fEvent->GetEquipmentHeader()) return NULL;
  return fEvent->GetEquipmentHeader()->GetTypeAttribute();
}

Int_t AliRawReaderRoot::GetEquipmentElementSize() const
{
// get the basic element size from the equipment header

  if (!fEvent || !fEvent->GetEquipmentHeader()) return 0;
  return fEvent->GetEquipmentHeader()->GetBasicSizeType();
}


Bool_t AliRawReaderRoot::ReadHeader()
{
// read a data header at the current position
// returns kFALSE if the data header could not be read

  fErrorCode = 0;
  if (!fEvent) return kFALSE;

  do {
    // skip payload (if event was not selected)
    if (fCount > 0) fPosition += fCount;

    // get the first or the next sub event if at the end of a sub event
    if (!fSubEvent || (fPosition >= fEnd)) {

      // check for end of event data
      if (fSubEventIndex >= fEvent->GetNSubEvents()) return kFALSE;
      fSubEvent = fEvent->GetSubEvent(fSubEventIndex++);

      // check the magic word of the sub event
      if (!fSubEvent->GetHeader()->IsValid()) {
	Error("ReadHeader", "wrong magic number in sub event!");
	fSubEvent->GetHeader()->Dump();
	fErrorCode = kErrMagic;
	return kFALSE;
      }

      fRawData = fSubEvent->GetRawData();
      fCount = 0;
      fPosition = (UChar_t*) fRawData->GetBuffer();
      fEnd = ((UChar_t*) fRawData->GetBuffer()) + fRawData->GetSize();
    }

    // continue with the next sub event if no data left in the payload
    if (fPosition >= fEnd) continue;

    // check that there are enough bytes left for the data header
    if (fPosition + sizeof(AliRawDataHeader) > fEnd) {
      Error("ReadHeader", "could not read data header!");
      Warning("ReadHeader", "skipping %d bytes", fEnd - fPosition);
      fSubEvent->GetHeader()->Dump();
      fCount = 0;
      fPosition = fEnd;
      fErrorCode = kErrNoDataHeader;
      continue;
    }

    // "read" the data header
    fHeader = (AliRawDataHeader*) fPosition;
    fPosition += sizeof(AliRawDataHeader);
    if (fHeader->fSize != 0xFFFFFFFF) {
      fCount = fHeader->fSize - sizeof(AliRawDataHeader);
    } else {
      fCount = fEnd - fPosition;
    }

    // check consistency of data size in the header and in the sub event
    if (fPosition + fCount > fEnd) {  
      Error("ReadHeader", "size in data header exceeds event size!");
      Warning("ReadHeader", "skipping %d bytes", fEnd - fPosition);
      fSubEvent->GetHeader()->Dump();
      fCount = 0;
      fPosition = fEnd;
      fErrorCode = kErrSize;
      continue;
    }

  } while (!IsSelected());

  return kTRUE;
}

Bool_t AliRawReaderRoot::ReadNextData(UChar_t*& data)
{
// reads the next payload at the current position
// returns kFALSE if the data could not be read

  fErrorCode = 0;
  while (fCount == 0) {
    if (!ReadHeader()) return kFALSE;
  }
  data = fPosition;
  fPosition += fCount;  
  fCount = 0;
  return kTRUE;
}

Bool_t AliRawReaderRoot::ReadNext(UChar_t* data, Int_t size)
{
// reads the next block of data at the current position
// returns kFALSE if the data could not be read

  fErrorCode = 0;
  if (fPosition + size > fEnd) {
    Error("ReadNext", "could not read data!");
    fErrorCode = kErrOutOfBounds;
    return kFALSE;
  }
  memcpy(data, fPosition, size);
  fPosition += size;
  fCount -= size;
  return kTRUE;
}


Bool_t AliRawReaderRoot::Reset()
{
// reset the current position to the beginning of the event

  fSubEventIndex = 0;
  fSubEvent = NULL;
  fRawData = NULL;
  fHeader = NULL;

  fCount = 0;
  fPosition = fEnd = NULL;
  return kTRUE;
}


Bool_t AliRawReaderRoot::NextEvent()
{
// go to the next event in the root file

  if (!fFile) return kFALSE;

  do {
    if (fBranch->GetEntry(fEventIndex+1) <= 0) {
      delete fEvent;
      fEvent = new AliRawEvent;
      fBranch->SetAddress(&fEvent);
      return kFALSE;
    }
    fEventIndex++;
  } while (!IsEventSelected());
  return Reset();
}

Bool_t AliRawReaderRoot::RewindEvents()
{
// go back to the beginning of the root file

  if (!fFile) return kFALSE;

  fEventIndex = -1;
  delete fEvent;
  fEvent = new AliRawEvent;
  fBranch->SetAddress(&fEvent);
  return Reset();
}


Int_t AliRawReaderRoot::CheckData() const
{
// check the consistency of the data

  if (!fEvent) return 0;

  AliRawEvent* subEvent = NULL;
  Int_t subEventIndex = 0;
  UChar_t* position = 0;
  UChar_t* end = 0;
  Int_t result = 0;

  while (kTRUE) {
    // get the first or the next sub event if at the end of a sub event
    if (!subEvent || (position >= end)) {

      // check for end of event data
      if (subEventIndex >= fEvent->GetNSubEvents()) return result;
      subEvent = fEvent->GetSubEvent(subEventIndex++);

      // check the magic word of the sub event
      if (!fSubEvent->GetHeader()->IsValid()) {
	result |= kErrMagic;
	return result;
      }

      AliRawData* rawData = subEvent->GetRawData();
      position = (UChar_t*) rawData->GetBuffer();
      end = ((UChar_t*) rawData->GetBuffer()) + rawData->GetSize();
    }

    // continue with the next sub event if no data left in the payload
    if (position >= end) continue;

    // check that there are enough bytes left for the data header
    if (position + sizeof(AliRawDataHeader) > end) {
      result |= kErrNoDataHeader;
      position = end;
      continue;
    }

    // check consistency of data size in the header and in the sub event
    AliRawDataHeader* header = (AliRawDataHeader*) position;
    if (fHeader->fSize != 0xFFFFFFFF) {
      if (position + header->fSize > end) {
	result |= kErrSize;
	position = end;
      } else {
	position += header->fSize;
      }
    } else {
      position = end;
    }
  };

  return result;
}
Commit	Line	Data
04fa961a	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
bea6b2a4	16	/* $Id$ */
bea6b2a4	17
04fa961a	18	///////////////////////////////////////////////////////////////////////////////
bea6b2a4	19	///
	20	/// This is a class for reading raw data from a root file.
	21	///
	22	/// The root file is expected to contain a tree of name "RAW" with
	23	/// a branch of name "rawevent" which contains objects of type
	24	/// AliRawEvent.
	25	///
	26	/// The file name and the event number are arguments of the constructor
	27	/// of AliRawReaderRoot.
	28	///
04fa961a	29	///////////////////////////////////////////////////////////////////////////////
04fa961a	30
a197a4ce	31	#include <TFile.h>
a197a4ce	32	#include <TTree.h>
04fa961a	33	#include "AliRawReaderRoot.h"
42d20574	34	#include "AliRawEvent.h"
a197a4ce	35	#include "AliRawEventHeader.h"
	36	#include "AliRawEquipmentHeader.h"
	37	#include "AliRawData.h"
04fa961a	38
	39
	40	ClassImp(AliRawReaderRoot)
	41
	42
dd9a70fe	43	AliRawReaderRoot::AliRawReaderRoot(const char* fileName, Int_t eventNumber) :
	44	fFile(NULL),
	45	fBranch(NULL),
	46	fEventIndex(eventNumber),
	47	fEvent(NULL),
	48	fSubEventIndex(0),
	49	fSubEvent(NULL),
	50	fRawData(NULL),
	51	fPosition(NULL),
	52	fEnd(NULL)
04fa961a	53	{
	54	// create an object to read digits from the given input file for the
	55	// event with the given number
	56
03c6d9a3	57	TDirectory* dir = gDirectory;
04fa961a	58	fFile = TFile::Open(fileName);
03c6d9a3	59	dir->cd();
04fa961a	60	if (!fFile \|\| !fFile->IsOpen()) {
	61	Error("AliRawReaderRoot", "could not open file %s", fileName);
	62	return;
	63	}
	64	TTree* tree = (TTree*) fFile->Get("RAW");
	65	if (!tree) {
	66	Error("AliRawReaderRoot", "no raw data tree found");
	67	return;
	68	}
dd9a70fe	69	fBranch = tree->GetBranch("rawevent");
dd9a70fe	70	if (!fBranch) {
04fa961a	71	Error("AliRawReaderRoot", "no raw data branch found");
	72	return;
	73	}
	74
	75	fEvent = new AliRawEvent;
dd9a70fe	76	fBranch->SetAddress(&fEvent);
	77	if (fEventIndex >= 0) {
	78	if (fBranch->GetEntry(fEventIndex) <= 0) {
	79	Error("AliRawReaderRoot", "no event with number %d found", fEventIndex);
	80	return;
	81	}
04fa961a	82	}
04fa961a	83	}
04fa961a	84
dd9a70fe	85	AliRawReaderRoot::AliRawReaderRoot(AliRawEvent* event) :
	86	fFile(NULL),
	87	fBranch(NULL),
	88	fEventIndex(-1),
	89	fEvent(event),
	90	fSubEventIndex(0),
	91	fSubEvent(NULL),
	92	fRawData(NULL),
	93	fPosition(NULL),
	94	fEnd(NULL)
04fa961a	95	{
	96	// create an object to read digits from the given raw event
	97
04fa961a	98	}
04fa961a	99
42d20574	100	AliRawReaderRoot::AliRawReaderRoot(const AliRawReaderRoot& rawReader) :
dd9a70fe	101	AliRawReader(rawReader),
	102	fFile(NULL),
	103	fBranch(NULL),
	104	fEventIndex(rawReader.fEventIndex),
	105	fEvent(NULL),
	106	fSubEventIndex(rawReader.fSubEventIndex),
	107	fSubEvent(NULL),
	108	fRawData(NULL),
	109	fPosition(NULL),
	110	fEnd(NULL)
42d20574	111	{
	112	// copy constructor
	113
dd9a70fe	114	if (rawReader.fFile) {
	115	TDirectory* dir = gDirectory;
	116	fFile = TFile::Open(rawReader.fFile->GetName());
	117	dir->cd();
	118	if (!fFile \|\| !fFile->IsOpen()) {
	119	Error("AliRawReaderRoot", "could not open file %s",
	120	rawReader.fFile->GetName());
	121	return;
	122	}
	123	TTree* tree = (TTree*) fFile->Get("RAW");
	124	if (!tree) {
	125	Error("AliRawReaderRoot", "no raw data tree found");
	126	return;
	127	}
	128	fBranch = tree->GetBranch("rawevent");
	129	if (!fBranch) {
	130	Error("AliRawReaderRoot", "no raw data branch found");
	131	return;
	132	}
	133
	134	fEvent = new AliRawEvent;
	135	fBranch->SetAddress(&fEvent);
	136	if (fEventIndex >= 0) {
	137	if (fBranch->GetEntry(fEventIndex) <= 0) {
	138	Error("AliRawReaderRoot", "no event with number %d found",
	139	fEventIndex);
	140	return;
	141	}
	142	}
	143	} else {
	144	fEvent = rawReader.fEvent;
	145	}
	146
	147	if (fSubEventIndex > 0) {
	148	fSubEvent = fEvent->GetSubEvent(fSubEventIndex-1);
	149	fRawData = fSubEvent->GetRawData();
	150	fCount = 0;
	151	fHeader = (AliRawDataHeader) ((UChar_t) fRawData->GetBuffer() +
	152	((UChar_t*) rawReader.fHeader -
	153	(UChar_t*) rawReader.fRawData->GetBuffer()));
	154	fPosition = (UChar_t*) fRawData->GetBuffer() +
	155	(rawReader.fPosition - (UChar_t*) rawReader.fRawData->GetBuffer());
	156	fEnd = ((UChar_t*) fRawData->GetBuffer()) + fRawData->GetSize();
	157	}
42d20574	158	}
	159
	160	AliRawReaderRoot& AliRawReaderRoot::operator = (const AliRawReaderRoot&
	161	rawReader)
	162	{
	163	// assignment operator
	164
	165	this->~AliRawReaderRoot();
	166	new(this) AliRawReaderRoot(rawReader);
	167	return *this;
	168	}
	169
04fa961a	170	AliRawReaderRoot::~AliRawReaderRoot()
	171	{
	172	// delete objects and close root file
	173
	174	if (fFile) {
	175	if (fEvent) delete fEvent;
	176	fFile->Close();
	177	delete fFile;
	178	}
	179	}
	180
	181
42d20574	182	UInt_t AliRawReaderRoot::GetType() const
04fa961a	183	{
	184	// get the type from the event header
	185
	186	if (!fEvent) return 0;
	187	return fEvent->GetHeader()->GetType();
	188	}
	189
42d20574	190	UInt_t AliRawReaderRoot::GetRunNumber() const
04fa961a	191	{
	192	// get the run number from the event header
	193
	194	if (!fEvent) return 0;
	195	return fEvent->GetHeader()->GetRunNumber();
	196	}
	197
42d20574	198	const UInt_t* AliRawReaderRoot::GetEventId() const
04fa961a	199	{
	200	// get the event id from the event header
	201
	202	if (!fEvent) return NULL;
	203	return fEvent->GetHeader()->GetId();
	204	}
	205
42d20574	206	const UInt_t* AliRawReaderRoot::GetTriggerPattern() const
04fa961a	207	{
	208	// get the trigger pattern from the event header
	209
	210	if (!fEvent) return NULL;
	211	return fEvent->GetHeader()->GetTriggerPattern();
	212	}
	213
42d20574	214	const UInt_t* AliRawReaderRoot::GetDetectorPattern() const
04fa961a	215	{
	216	// get the detector pattern from the event header
	217
	218	if (!fEvent) return NULL;
	219	return fEvent->GetHeader()->GetDetectorPattern();
	220	}
	221
42d20574	222	const UInt_t* AliRawReaderRoot::GetAttributes() const
04fa961a	223	{
	224	// get the type attributes from the event header
	225
	226	if (!fEvent) return NULL;
	227	return fEvent->GetHeader()->GetTypeAttribute();
	228	}
	229
c946ab02	230	UInt_t AliRawReaderRoot::GetLDCId() const
	231	{
	232	// get the LDC Id from the event header
	233
	234	if (!fEvent \|\| !fEvent->GetSubEvent(fSubEventIndex)) return 0;
	235	return fEvent->GetSubEvent(fSubEventIndex)->GetHeader()->GetLDCId();
	236	}
	237
42d20574	238	UInt_t AliRawReaderRoot::GetGDCId() const
04fa961a	239	{
	240	// get the GDC Id from the event header
	241
	242	if (!fEvent) return 0;
	243	return fEvent->GetHeader()->GetGDCId();
	244	}
	245
	246
c946ab02	247	Int_t AliRawReaderRoot::GetEquipmentSize() const
	248	{
	249	// get the size of the equipment
	250
	251	if (!fEvent \|\| !fEvent->GetEquipmentHeader()) return 0;
	252	return fEvent->GetEquipmentHeader()->GetEquipmentSize();
	253	}
	254
	255	Int_t AliRawReaderRoot::GetEquipmentType() const
	256	{
	257	// get the type from the equipment header
	258
	259	if (!fEvent \|\| !fEvent->GetEquipmentHeader()) return -1;
	260	return fEvent->GetEquipmentHeader()->GetEquipmentType();
	261	}
	262
	263	Int_t AliRawReaderRoot::GetEquipmentId() const
	264	{
	265	// get the ID from the equipment header
	266
	267	if (!fEvent \|\| !fEvent->GetEquipmentHeader()) return -1;
	268	return fEvent->GetEquipmentHeader()->GetId();
	269	}
	270
	271	const UInt_t* AliRawReaderRoot::GetEquipmentAttributes() const
	272	{
	273	// get the attributes from the equipment header
	274
	275	if (!fEvent \|\| !fEvent->GetEquipmentHeader()) return NULL;
	276	return fEvent->GetEquipmentHeader()->GetTypeAttribute();
	277	}
	278
	279	Int_t AliRawReaderRoot::GetEquipmentElementSize() const
	280	{
	281	// get the basic element size from the equipment header
	282
	283	if (!fEvent \|\| !fEvent->GetEquipmentHeader()) return 0;
	284	return fEvent->GetEquipmentHeader()->GetBasicSizeType();
	285	}
	286
	287
	288	Bool_t AliRawReaderRoot::ReadHeader()
04fa961a	289	{
39f9963f	290	// read a data header at the current position
39f9963f	291	// returns kFALSE if the data header could not be read
04fa961a	292
b4857df7	293	fErrorCode = 0;
04fa961a	294	if (!fEvent) return kFALSE;
b4857df7	295
04fa961a	296	do {
b4857df7	297	// skip payload (if event was not selected)
	298	if (fCount > 0) fPosition += fCount;
	299
	300	// get the first or the next sub event if at the end of a sub event
	301	if (!fSubEvent \|\| (fPosition >= fEnd)) {
	302
	303	// check for end of event data
04fa961a	304	if (fSubEventIndex >= fEvent->GetNSubEvents()) return kFALSE;
04fa961a	305	fSubEvent = fEvent->GetSubEvent(fSubEventIndex++);
b4857df7	306
	307	// check the magic word of the sub event
	308	if (!fSubEvent->GetHeader()->IsValid()) {
c946ab02	309	Error("ReadHeader", "wrong magic number in sub event!");
b4857df7	310	fSubEvent->GetHeader()->Dump();
	311	fErrorCode = kErrMagic;
	312	return kFALSE;
	313	}
	314
04fa961a	315	fRawData = fSubEvent->GetRawData();
	316	fCount = 0;
	317	fPosition = (UChar_t*) fRawData->GetBuffer();
	318	fEnd = ((UChar_t*) fRawData->GetBuffer()) + fRawData->GetSize();
	319	}
b4857df7	320
	321	// continue with the next sub event if no data left in the payload
	322	if (fPosition >= fEnd) continue;
	323
39f9963f	324	// check that there are enough bytes left for the data header
	325	if (fPosition + sizeof(AliRawDataHeader) > fEnd) {
	326	Error("ReadHeader", "could not read data header!");
c946ab02	327	Warning("ReadHeader", "skipping %d bytes", fEnd - fPosition);
b4857df7	328	fSubEvent->GetHeader()->Dump();
	329	fCount = 0;
	330	fPosition = fEnd;
39f9963f	331	fErrorCode = kErrNoDataHeader;
b4857df7	332	continue;
04fa961a	333	}
b4857df7	334
39f9963f	335	// "read" the data header
	336	fHeader = (AliRawDataHeader*) fPosition;
	337	fPosition += sizeof(AliRawDataHeader);
	338	if (fHeader->fSize != 0xFFFFFFFF) {
	339	fCount = fHeader->fSize - sizeof(AliRawDataHeader);
	340	} else {
	341	fCount = fEnd - fPosition;
72dd1d4f	342	}
b4857df7	343
39f9963f	344	// check consistency of data size in the header and in the sub event
b4857df7	345	if (fPosition + fCount > fEnd) {
39f9963f	346	Error("ReadHeader", "size in data header exceeds event size!");
c946ab02	347	Warning("ReadHeader", "skipping %d bytes", fEnd - fPosition);
03c6d9a3	348	fSubEvent->GetHeader()->Dump();
	349	fCount = 0;
	350	fPosition = fEnd;
b4857df7	351	fErrorCode = kErrSize;
03c6d9a3	352	continue;
04fa961a	353	}
b4857df7	354
04fa961a	355	} while (!IsSelected());
b4857df7	356
04fa961a	357	return kTRUE;
	358	}
	359
	360	Bool_t AliRawReaderRoot::ReadNextData(UChar_t*& data)
	361	{
	362	// reads the next payload at the current position
	363	// returns kFALSE if the data could not be read
	364
b4857df7	365	fErrorCode = 0;
04fa961a	366	while (fCount == 0) {
c946ab02	367	if (!ReadHeader()) return kFALSE;
04fa961a	368	}
	369	data = fPosition;
	370	fPosition += fCount;
	371	fCount = 0;
	372	return kTRUE;
	373	}
	374
	375	Bool_t AliRawReaderRoot::ReadNext(UChar_t* data, Int_t size)
	376	{
	377	// reads the next block of data at the current position
	378	// returns kFALSE if the data could not be read
	379
b4857df7	380	fErrorCode = 0;
04fa961a	381	if (fPosition + size > fEnd) {
04fa961a	382	Error("ReadNext", "could not read data!");
b4857df7	383	fErrorCode = kErrOutOfBounds;
04fa961a	384	return kFALSE;
	385	}
	386	memcpy(data, fPosition, size);
	387	fPosition += size;
	388	fCount -= size;
	389	return kTRUE;
	390	}
	391
	392
	393	Bool_t AliRawReaderRoot::Reset()
	394	{
	395	// reset the current position to the beginning of the event
	396
	397	fSubEventIndex = 0;
	398	fSubEvent = NULL;
	399	fRawData = NULL;
39f9963f	400	fHeader = NULL;
04fa961a	401
	402	fCount = 0;
	403	fPosition = fEnd = NULL;
	404	return kTRUE;
	405	}
	406
b4857df7	407
dd9a70fe	408	Bool_t AliRawReaderRoot::NextEvent()
	409	{
	410	// go to the next event in the root file
	411
	412	if (!fFile) return kFALSE;
	413
	414	do {
	415	if (fBranch->GetEntry(fEventIndex+1) <= 0) {
	416	delete fEvent;
	417	fEvent = new AliRawEvent;
	418	fBranch->SetAddress(&fEvent);
	419	return kFALSE;
	420	}
	421	fEventIndex++;
	422	} while (!IsEventSelected());
	423	return Reset();
	424	}
	425
	426	Bool_t AliRawReaderRoot::RewindEvents()
	427	{
	428	// go back to the beginning of the root file
	429
	430	if (!fFile) return kFALSE;
	431
	432	fEventIndex = -1;
	433	delete fEvent;
	434	fEvent = new AliRawEvent;
	435	fBranch->SetAddress(&fEvent);
	436	return Reset();
	437	}
	438
	439
b4857df7	440	Int_t AliRawReaderRoot::CheckData() const
	441	{
	442	// check the consistency of the data
	443
	444	if (!fEvent) return 0;
	445
	446	AliRawEvent* subEvent = NULL;
	447	Int_t subEventIndex = 0;
	448	UChar_t* position = 0;
	449	UChar_t* end = 0;
be50fca2	450	Int_t result = 0;
b4857df7	451
	452	while (kTRUE) {
	453	// get the first or the next sub event if at the end of a sub event
	454	if (!subEvent \|\| (position >= end)) {
	455
	456	// check for end of event data
be50fca2	457	if (subEventIndex >= fEvent->GetNSubEvents()) return result;
b4857df7	458	subEvent = fEvent->GetSubEvent(subEventIndex++);
	459
	460	// check the magic word of the sub event
be50fca2	461	if (!fSubEvent->GetHeader()->IsValid()) {
	462	result \|= kErrMagic;
	463	return result;
	464	}
b4857df7	465
	466	AliRawData* rawData = subEvent->GetRawData();
	467	position = (UChar_t*) rawData->GetBuffer();
	468	end = ((UChar_t*) rawData->GetBuffer()) + rawData->GetSize();
	469	}
	470
	471	// continue with the next sub event if no data left in the payload
	472	if (position >= end) continue;
	473
39f9963f	474	// check that there are enough bytes left for the data header
	475	if (position + sizeof(AliRawDataHeader) > end) {
	476	result \|= kErrNoDataHeader;
be50fca2	477	position = end;
	478	continue;
	479	}
b4857df7	480
39f9963f	481	// check consistency of data size in the header and in the sub event
	482	AliRawDataHeader* header = (AliRawDataHeader*) position;
	483	if (fHeader->fSize != 0xFFFFFFFF) {
	484	if (position + header->fSize > end) {
	485	result \|= kErrSize;
	486	position = end;
	487	} else {
	488	position += header->fSize;
	489	}
	490	} else {
be50fca2	491	position = end;
be50fca2	492	}
b4857df7	493	};
fd0de2e2	494
fd0de2e2	495	return result;
b4857df7	496	}