X-Git-Url: http://git.uio.no/git/?a=blobdiff_plain;f=RAW%2FAliRawReaderRoot.cxx;h=1fde2b8018387b002b2f991c708449121463234b;hb=9c6bd7496184aff662636ed7f003838c9284136c;hp=bcd41cc80d1f5086ad7efa058e498abf80970446;hpb=04fa961a68e4ca38be22e31a659eabd80ad1ffcf;p=u%2Fmrichter%2FAliRoot.git

diff --git a/RAW/AliRawReaderRoot.cxx b/RAW/AliRawReaderRoot.cxx
index bcd41cc80d1..1fde2b80183 100644
--- a/RAW/AliRawReaderRoot.cxx
+++ b/RAW/AliRawReaderRoot.cxx
@@ -13,70 +13,195 @@
  * provided "as is" without express or implied warranty.                  *
  **************************************************************************/
 
+/* $Id$ */
+
 ///////////////////////////////////////////////////////////////////////////////
-//
-// This is a class for reading a raw data from a root file and providing
-// information about digits
-//
+///
+/// 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
+/// AliRawVEvent.
+/// 
+/// The file name and the event number are arguments of the constructor
+/// of AliRawReaderRoot.
+///
 ///////////////////////////////////////////////////////////////////////////////
 
+#include <TFile.h>
+#include <TTree.h>
 #include "AliRawReaderRoot.h"
+#include "AliRawVEvent.h"
+#include "AliRawEventHeaderBase.h"
+#include "AliRawVEquipment.h"
+#include "AliRawEquipmentHeader.h"
+#include "AliRawData.h"
 
 
 ClassImp(AliRawReaderRoot)
 
+AliRawReaderRoot::AliRawReaderRoot() :
+  fFile(NULL),
+  fBranch(NULL),
+  fEventIndex(-1),
+  fEvent(NULL),
+  fEventHeader(NULL),
+  fSubEventIndex(0),
+  fSubEvent(NULL),
+  fEquipmentIndex(0),
+  fEquipment(NULL),
+  fRawData(NULL),
+  fPosition(NULL),
+  fEnd(NULL)
+{
+// default constructor
+
+}
 
-AliRawReaderRoot::AliRawReaderRoot(const char* fileName, Int_t eventNumber)
+AliRawReaderRoot::AliRawReaderRoot(const char* fileName, Int_t eventNumber) :
+  fFile(NULL),
+  fBranch(NULL),
+  fEventIndex(eventNumber),
+  fEvent(NULL),
+  fEventHeader(NULL),
+  fSubEventIndex(0),
+  fSubEvent(NULL),
+  fEquipmentIndex(0),
+  fEquipment(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);
+    fIsValid = kFALSE;
     return;
   }
   TTree* tree = (TTree*) fFile->Get("RAW");
   if (!tree) {
     Error("AliRawReaderRoot", "no raw data tree found");
+    fIsValid = kFALSE;
     return;
   }
-  TBranch* branch = tree->GetBranch("rawevent");
-  if (!branch) {
+  fBranch = tree->GetBranch("rawevent");
+  if (!fBranch) {
     Error("AliRawReaderRoot", "no raw data branch found");
+    fIsValid = kFALSE;
     return;
   }
 
-  fEvent = new AliRawEvent;
-  branch->SetAddress(&fEvent);
-  if (branch->GetEntry(eventNumber) <= 0) {
-    Error("AliRawReaderRoot", "no event with number %d found", eventNumber);
-    return;
+  fBranch->SetAddress(&fEvent);
+  if (fEventIndex >= 0) {
+    if (fBranch->GetEntry(fEventIndex) <= 0) {
+      Error("AliRawReaderRoot", "no event with number %d found", fEventIndex);
+      fIsValid = kFALSE;
+      return;
+    }
+    fEventHeader = fEvent->GetHeader();
   }
-  
-  fSubEventIndex = 0;
-  fSubEvent = NULL;
-  fRawData = NULL;
-  fMiniHeader = NULL;
-
-  fCount = 0;
-  fPosition = fEnd = NULL;
 }
 
-AliRawReaderRoot::AliRawReaderRoot(AliRawEvent* event)
+AliRawReaderRoot::AliRawReaderRoot(AliRawVEvent* event) :
+  fFile(NULL),
+  fBranch(NULL),
+  fEventIndex(-1),
+  fEvent(event),
+  fEventHeader(event->GetHeader()),
+  fSubEventIndex(0),
+  fSubEvent(NULL),
+  fEquipmentIndex(0),
+  fEquipment(NULL),
+  fRawData(NULL),
+  fPosition(NULL),
+  fEnd(NULL)
 {
 // create an object to read digits from the given raw event
+  if (!fEvent) fIsValid = kFALSE;
+}
 
-  fFile = NULL;
-  fEvent = event;
-  
-  fSubEventIndex = 0;
-  fSubEvent = NULL;
-  fRawData = NULL;
-  fMiniHeader =  NULL;
+AliRawReaderRoot::AliRawReaderRoot(const AliRawReaderRoot& rawReader) :
+  AliRawReader(rawReader),
+  fFile(NULL),
+  fBranch(NULL),
+  fEventIndex(rawReader.fEventIndex),
+  fEvent(NULL),
+  fEventHeader(NULL),
+  fSubEventIndex(rawReader.fSubEventIndex),
+  fSubEvent(NULL),
+  fEquipmentIndex(rawReader.fEquipmentIndex),
+  fEquipment(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());
+      fIsValid = kFALSE;
+      return;
+    }
+    TTree* tree = (TTree*) fFile->Get("RAW");
+    if (!tree) {
+      Error("AliRawReaderRoot", "no raw data tree found");
+      fIsValid = kFALSE;
+      return;
+    }
+    fBranch = tree->GetBranch("rawevent");
+    if (!fBranch) {
+      Error("AliRawReaderRoot", "no raw data branch found");
+      fIsValid = kFALSE;
+      return;
+    }
 
-  fCount = 0;
-  fPosition = fEnd = NULL;
+    fBranch->SetAddress(&fEvent);
+    if (fEventIndex >= 0) {
+      if (fBranch->GetEntry(fEventIndex) <= 0) {
+	Error("AliRawReaderRoot", "no event with number %d found", 
+	      fEventIndex);
+	fIsValid = kFALSE;
+	return;
+      }
+      fEventHeader = fEvent->GetHeader();
+    }
+  } else {
+    fEvent = rawReader.fEvent;
+    fEventHeader = rawReader.fEventHeader;
+  }
+
+  if (fSubEventIndex > 0) {
+    fSubEvent = fEvent->GetSubEvent(fSubEventIndex-1);
+    fEquipment = fSubEvent->GetEquipment(fEquipmentIndex);
+    fRawData = fEquipment->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()
@@ -90,94 +215,263 @@ AliRawReaderRoot::~AliRawReaderRoot()
   }
 }
 
+const AliRawEventHeaderBase* AliRawReaderRoot::GetEventHeader() const
+{
+  // Get the even header
+  // Return NULL in case of failure
+  return fEventHeader;
+}
 
-UInt_t AliRawReaderRoot::GetType()
+UInt_t AliRawReaderRoot::GetType() const
 {
 // get the type from the event header
 
-  if (!fEvent) return 0;
-  return fEvent->GetHeader()->GetType();
+  if (!fEventHeader) return 0;
+  return fEventHeader->Get("Type");
 }
 
-UInt_t AliRawReaderRoot::GetRunNumber()
+UInt_t AliRawReaderRoot::GetRunNumber() const
 {
 // get the run number from the event header
 
-  if (!fEvent) return 0;
-  return fEvent->GetHeader()->GetRunNumber();
+  if (!fEventHeader) return 0;
+  return fEventHeader->Get("RunNb");
 }
 
-const UInt_t* AliRawReaderRoot::GetEventId()
+const UInt_t* AliRawReaderRoot::GetEventId() const
 {
 // get the event id from the event header
 
-  if (!fEvent) return NULL;
-  return fEvent->GetHeader()->GetId();
+  if (!fEventHeader) return NULL;
+  return fEventHeader->GetP("Id");
 }
 
-const UInt_t* AliRawReaderRoot::GetTriggerPattern()
+const UInt_t* AliRawReaderRoot::GetTriggerPattern() const
 {
 // get the trigger pattern from the event header
 
-  if (!fEvent) return NULL;
-  return fEvent->GetHeader()->GetTriggerPattern();
+  if (!fEventHeader) return NULL;
+  return fEventHeader->GetP("TriggerPattern");
 }
 
-const UInt_t* AliRawReaderRoot::GetDetectorPattern()
+const UInt_t* AliRawReaderRoot::GetDetectorPattern() const
 {
 // get the detector pattern from the event header
 
-  if (!fEvent) return NULL;
-  return fEvent->GetHeader()->GetDetectorPattern();
+  if (!fEventHeader) return NULL;
+  return fEventHeader->GetP("DetectorPattern");
 }
 
-const UInt_t* AliRawReaderRoot::GetAttributes()
+const UInt_t* AliRawReaderRoot::GetAttributes() const
 {
 // get the type attributes from the event header
 
-  if (!fEvent) return NULL;
-  return fEvent->GetHeader()->GetTypeAttribute();
+  if (!fEventHeader) return NULL;
+  return fEventHeader->GetP("TypeAttribute");
+}
+
+const UInt_t* AliRawReaderRoot::GetSubEventAttributes() const
+{
+// get the type attributes from the sub event header
+
+  if (!fSubEvent) return NULL;
+  return fSubEvent->GetHeader()->GetP("TypeAttribute");
+}
+
+UInt_t AliRawReaderRoot::GetLDCId() const
+{
+// get the LDC Id from the event header
+
+  if (!fEvent || !fSubEvent) return 0;
+  return fSubEvent->GetHeader()->Get("LdcId");
 }
 
-UInt_t AliRawReaderRoot::GetGDCId()
+UInt_t AliRawReaderRoot::GetGDCId() const
 {
 // get the GDC Id from the event header
 
-  if (!fEvent) return 0;
-  return fEvent->GetHeader()->GetGDCId();
+  if (!fEventHeader) return 0;
+  return fEventHeader->Get("GdcId");
 }
 
+UInt_t AliRawReaderRoot::GetTimestamp() const
+{
+  if (!fEventHeader) return 0;
+  return fEventHeader->Get("Timestamp");
+}
 
-Bool_t AliRawReaderRoot::ReadMiniHeader()
+Int_t AliRawReaderRoot::GetEquipmentSize() const
 {
-// read a mini header at the current position
-// returns kFALSE if the mini header could not be read
+// get the size of the equipment
+
+  if (!fEvent || !fEquipment || !fEquipment->GetEquipmentHeader()) return 0;
+  return fEquipment->GetEquipmentHeader()->GetEquipmentSize();
+}
 
+Int_t AliRawReaderRoot::GetEquipmentType() const
+{
+// get the type from the equipment header
+
+  if (!fEvent || !fEquipment || !fEquipment->GetEquipmentHeader()) return -1;
+  return fEquipment->GetEquipmentHeader()->GetEquipmentType();
+}
+
+Int_t AliRawReaderRoot::GetEquipmentId() const
+{
+// get the ID from the equipment header
+
+  if (!fEvent || !fEquipment || !fEquipment->GetEquipmentHeader()) return -1;
+  return fEquipment->GetEquipmentHeader()->GetId();
+}
+
+const UInt_t* AliRawReaderRoot::GetEquipmentAttributes() const
+{
+// get the attributes from the equipment header
+
+  if (!fEvent || !fEquipment || !fEquipment->GetEquipmentHeader()) return NULL;
+  return fEquipment->GetEquipmentHeader()->GetTypeAttribute();
+}
+
+Int_t AliRawReaderRoot::GetEquipmentElementSize() const
+{
+// get the basic element size from the equipment header
+
+  if (!fEvent || !fEquipment || !fEquipment->GetEquipmentHeader()) return 0;
+  return fEquipment->GetEquipmentHeader()->GetBasicSizeType();
+}
+
+Int_t AliRawReaderRoot::GetEquipmentHeaderSize() const
+{
+// get the size of the equipment header (28 bytes by default)
+
+  if (!fEvent || !fEquipment || !fEquipment->GetEquipmentHeader()) return 0;
+  return fEquipment->GetEquipmentHeader()->HeaderSize();
+}
+
+// _________________________________________________________________________
+void AliRawReaderRoot::SwapData(const void* inbuf, const void* outbuf, UInt_t size) {
+  // The method swaps the contents of the
+  // raw-data event header
+  UInt_t  intCount = (size+3)/sizeof(UInt_t);
+
+  UInt_t* buf = (UInt_t*) inbuf;    // temporary integers buffer
+  for (UInt_t i=0; i<intCount; i++, buf++) {
+      UInt_t value = SwapWord(*buf);
+      if (i==(intCount-1))
+         memcpy((UInt_t*)outbuf+i, &value, size%sizeof(UInt_t));
+      else
+         memcpy((UInt_t*)outbuf+i, &value, sizeof(UInt_t));
+  }
+}
+// _________________________________________________________________________
+
+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 {
-    if (fCount > 0) fPosition += fCount;      // skip payload if event was not selected
-    if (!fSubEvent || (fPosition >= fEnd)) {  // new sub event
-      if (fSubEventIndex >= fEvent->GetNSubEvents()) return kFALSE;
-      fSubEvent = fEvent->GetSubEvent(fSubEventIndex++);
-      fRawData = fSubEvent->GetRawData();
+    // skip payload (if event was not selected)
+    if (fCount > 0) fPosition += fCount;
+
+    // get the first or the next equipment if at the end of an equipment
+    if (!fEquipment || (fPosition >= fEnd)) {
+
+      // get the first or the next sub event if at the end of a sub event
+      if (!fSubEvent || (fEquipmentIndex >= fSubEvent->GetNEquipments())) {
+
+	// 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;
+	}
+
+	fEquipmentIndex = 0;
+	fEquipment = NULL;
+	fRawData = NULL;
+      }
+
+      // get the next equipment and raw data
       fCount = 0;
+      if (fEquipmentIndex >= fSubEvent->GetNEquipments()) {
+	fEquipment = NULL;
+	continue;
+      }
+      fEquipment = fSubEvent->GetEquipment(fEquipmentIndex++);
+      if (!fEquipment) continue;
+      if (!IsSelected()) {
+	fPosition = fEnd;
+	continue;
+      }
+      fRawData = fEquipment->GetRawData();
+      if (!fRawData) {
+	fPosition = fEnd;
+	continue;
+      }
       fPosition = (UChar_t*) fRawData->GetBuffer();
       fEnd = ((UChar_t*) fRawData->GetBuffer()) + fRawData->GetSize();
     }
-    if (fPosition >= fEnd) continue;          // no data left in the payload
-    if (fPosition + sizeof(AliMiniHeader) > fEnd) {
-      Error("ReadMiniHeader", "could not read data!");
-      return kFALSE;
+
+    // continue with the next equipment if no data left in the payload
+    if (fPosition >= fEnd) continue;
+
+    if (fRequireHeader) {
+      // 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 %ld bytes", fEnd - fPosition);
+	fEquipment->GetEquipmentHeader()->Dump();
+	fCount = 0;
+	fPosition = fEnd;
+	fErrorCode = kErrNoDataHeader;
+	continue;
+      }
+
+      // "read" the data header
+      fHeader = (AliRawDataHeader*) fPosition;
+#ifndef R__BYTESWAP
+      SwapData((void*) fHeader, (void*) fHeaderSwapped, sizeof(AliRawDataHeader));
+      fHeader=fHeaderSwapped;
+#endif
+      if ((fPosition + fHeader->fSize) != fEnd) {
+	if (fHeader->fSize != 0xFFFFFFFF)
+	  Warning("ReadHeader",
+		  "Equipment %d : raw data size found in the header is wrong (%d != %ld)! Using the equipment size instead !",
+		  fEquipment->GetEquipmentHeader()->GetId(),fHeader->fSize, fEnd - fPosition);
+	fHeader->fSize = fEnd - fPosition;
+      }
+      fPosition += sizeof(AliRawDataHeader);
     }
-    fMiniHeader = (AliMiniHeader*) fPosition;
-    fPosition += sizeof(AliMiniHeader);
-    CheckMiniHeader();
-    fCount = fMiniHeader->fSize;
-    if (fPosition + fCount > fEnd) {  // check data size in mini header and sub event
-      Error("ReadMiniHeader", "size in mini header exceeds event size!");
-      fMiniHeader->fSize = fCount = fEnd - fPosition;
+
+    if (fHeader && (fHeader->fSize != 0xFFFFFFFF)) {
+      fCount = fHeader->fSize - sizeof(AliRawDataHeader);
+
+      // 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 %ld bytes", fEnd - fPosition);
+	fEquipment->GetEquipmentHeader()->Dump();
+	fCount = 0;
+	fPosition = fEnd;
+	fErrorCode = kErrSize;
+	continue;
+      }
+
+    } else {
+      fCount = fEnd - fPosition;
     }
+
   } while (!IsSelected());
+
   return kTRUE;
 }
 
@@ -186,8 +480,9 @@ 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 (!ReadMiniHeader()) return kFALSE;
+    if (!ReadHeader()) return kFALSE;
   }
   data = fPosition;
   fPosition += fCount;  
@@ -200,11 +495,14 @@ 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;
@@ -217,11 +515,177 @@ Bool_t AliRawReaderRoot::Reset()
 
   fSubEventIndex = 0;
   fSubEvent = NULL;
+  fEquipmentIndex = 0;
+  fEquipment = NULL;
   fRawData = NULL;
-  fMiniHeader = NULL;
+  fHeader = NULL;
 
   fCount = 0;
   fPosition = fEnd = NULL;
   return kTRUE;
 }
 
+
+Bool_t AliRawReaderRoot::NextEvent()
+{
+// go to the next event in the root file
+
+  if (!fBranch) return kFALSE;
+
+  do {
+    delete fEvent;
+    fEvent = NULL;
+    fEventHeader = NULL;
+    fBranch->SetAddress(&fEvent);
+    if (fBranch->GetEntry(fEventIndex+1) <= 0)
+      return kFALSE;
+    fEventHeader = fEvent->GetHeader();
+    fEventIndex++;
+  } while (!IsEventSelected());
+  fEventNumber++;
+  return Reset();
+}
+
+Bool_t AliRawReaderRoot::RewindEvents()
+{
+// go back to the beginning of the root file
+
+  if (!fBranch) return kFALSE;
+
+  fEventIndex = -1;
+  delete fEvent;
+  fEvent = NULL;
+  fEventHeader = NULL;
+  fBranch->SetAddress(&fEvent);
+  fEventNumber = -1;
+  return Reset();
+}
+
+Bool_t  AliRawReaderRoot::GotoEvent(Int_t event)
+{
+  // go to a particular event
+  // Uses the absolute event index inside the
+  // raw-data file
+
+  if (!fBranch) return kFALSE;
+
+  delete fEvent;
+  fEvent = NULL;
+  fEventHeader = NULL;
+  fBranch->SetAddress(&fEvent);
+  if (fBranch->GetEntry(event) <= 0)
+    return kFALSE;
+  fEventHeader = fEvent->GetHeader();
+  fEventIndex = event;
+  fEventNumber++;
+  return Reset();
+}
+
+Int_t AliRawReaderRoot::GetNumberOfEvents() const
+{
+  // Get the total number of events in
+  // the raw-data tree
+
+  if (!fBranch) return -1;
+
+  return fBranch->GetEntries();
+}
+
+Int_t AliRawReaderRoot::CheckData() const
+{
+// check the consistency of the data
+
+  if (!fEvent) return 0;
+
+  AliRawVEvent* subEvent = NULL;
+  Int_t subEventIndex = 0;
+  AliRawVEquipment* equipment = NULL;
+  Int_t equipmentIndex = 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 an equipment
+    if (!subEvent || (equipmentIndex >= subEvent->GetNEquipments())) {
+
+      // 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;
+      }
+
+      equipmentIndex = 0;
+    }
+
+    // get the next equipment and raw data
+    if (equipmentIndex >= subEvent->GetNEquipments()) {
+      equipment = NULL;
+      continue;
+    }
+    equipment = subEvent->GetEquipment(equipmentIndex++);
+    if (!equipment) continue;
+    AliRawData* rawData = equipment->GetRawData();
+    if (!rawData) continue;
+    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;
+
+    if (fRequireHeader) {
+    // check that there are enough bytes left for the data header
+      if (position + sizeof(AliRawDataHeader) > end) {
+	result |= kErrNoDataHeader;
+	continue;
+      }
+
+      // check consistency of data size in the header and in the equipment
+      AliRawDataHeader* header = (AliRawDataHeader*) position;
+      if ((position + header->fSize) != end) {
+	if (header->fSize != 0xFFFFFFFF)
+	  Warning("ReadHeader",
+		  "Equipment %d : raw data size found in the header is wrong (%d != %ld)! Using the equipment size instead !",
+		  equipment->GetEquipmentHeader()->GetId(),header->fSize, end - position);
+	header->fSize = end - position;
+	result |= kErrSize;
+      }
+    }
+    position = end;
+  };
+
+  return result;
+}
+
+AliRawReader* AliRawReaderRoot::CloneSingleEvent() const
+{
+  // Clones the current event and
+  // creates raw-reader for the cloned event
+  // Can be used in order to make asynchronious
+  // access to the current raw data within
+  // several threads (online event display/reco)
+
+  if (fEvent) {
+    // Root formatted raw data
+    AliRawVEvent *gdcRootEvent = (AliRawVEvent*)fEvent->Clone();
+    for (Int_t ldcCounter=0; ldcCounter < gdcRootEvent->GetNSubEvents(); ldcCounter++) {
+      AliRawVEvent *ldcRootEvent = gdcRootEvent->GetSubEvent(ldcCounter);
+      AliRawVEvent *subEvent = fEvent->GetSubEvent(ldcCounter);
+      for (Int_t eqCounter=0; eqCounter < ldcRootEvent->GetNEquipments(); eqCounter++) {
+	AliRawVEquipment *equipment=ldcRootEvent->GetEquipment(eqCounter);
+	AliRawVEquipment *eq = subEvent->GetEquipment(eqCounter);
+	equipment->CloneRawData(eq->GetRawData());
+      }
+    }
+    // Reset original event and newly
+    // produced one
+    gdcRootEvent->GetSubEvent(-1);
+    fEvent->GetSubEvent(-1);
+    return new AliRawReaderRoot(gdcRootEvent);
+  }
+  return NULL;
+}