RAW/AliRawEquipmentHeader.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-2003, 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
  16 // @(#)alimdc:$Name$:$Id$
  17 // Author: Fons Rademakers  26/11/99
  18
  19 //////////////////////////////////////////////////////////////////////////
  20 //                                                                      //
  21 // AliRawEquipmentHeader                                                //
  22 //                                                                      //
  23 //////////////////////////////////////////////////////////////////////////
  24
  25 #include <Bytes.h>
  26
  27 #include "AliRawEquipmentHeader.h"
  28
  29 ClassImp(AliRawEquipmentHeader)
  30
  31 //______________________________________________________________________________
  32 AliRawEquipmentHeader::AliRawEquipmentHeader():
  33   fSize(0),
  34   fEquipmentType(0),
  35   fEquipmentID(0xffffffff),
  36   fBasicElementSizeType(0)
  37 {
  38   // Default constructor
  39   for(Int_t i = 0; i < kAttributeWords; i++)
  40     fTypeAttribute[i] = 0;
  41 }
  42
  43 //______________________________________________________________________________
  44 UInt_t AliRawEquipmentHeader::SwapWord(UInt_t x) const
  45 {
  46    // Swap the endianess of the integer value 'x'
  47
  48    return (((x & 0x000000ffU) << 24) | ((x & 0x0000ff00U) <<  8) |
  49            ((x & 0x00ff0000U) >>  8) | ((x & 0xff000000U) >> 24));
  50 }
  51
  52 //______________________________________________________________________________
  53 void AliRawEquipmentHeader::Swap()
  54 {
  55    // Swap equipment header data. There is no way to see if the data
  56    // has already been swapped. This method is only called when the
  57    // header is read from the DATE event builder (GDC).
  58
  59    fSize                 = SwapWord(fSize);
  60    fEquipmentType        = SwapWord(fEquipmentType);
  61    fEquipmentID          = SwapWord(fEquipmentID);
  62    fBasicElementSizeType = SwapWord(fBasicElementSizeType);
  63    for (int i = 0; i < kAttributeWords; i++)
  64       fTypeAttribute[i] = SwapWord(fTypeAttribute[i]);
  65 }
  66
  67 //______________________________________________________________________________
  68 void AliRawEquipmentHeader::Reset()
  69 {
  70   // Reset the contents of the equipment
  71   // header data
  72   fSize = fEquipmentType = fBasicElementSizeType = 0;
  73   fEquipmentID = 0xffffffff;
  74
  75   for(Int_t i = 0; i < kAttributeWords; i++)
  76     fTypeAttribute[i] = 0;
  77 }