1 /* Copyright(c) 1998-2003, ALICE Experiment at CERN, All rights reserved. *
2 * See cxx source for full Copyright notice */
4 /////////////////////////////////////////////////////
5 // Class used for read-write the ALTRO data format //
6 /////////////////////////////////////////////////////
8 /*This class is an interface between the altro format file and the
9 user, and can be used in write or read mode
10 In the write mode a new altro file is created and filled using the method FillBuffer().
11 The name of the file is specified as parameter in the constructor as well as the type mode.
12 In the Read mode the specified file is open and the values can be read using the
13 methods GetNext() and GetNextBackWord().
14 The first method is used to read the file forward while the second is used to read backward
17 #ifndef AliTPCBUFFER160_H
18 #define AliTPCBUFFER160_H
22 #include "Riostream.h"
26 class AliTPCBuffer160:public TObject{
28 AliTPCBuffer160(){}//default constructor
29 AliTPCBuffer160(const char* fileName,Int_t flag);//constructor
30 virtual ~AliTPCBuffer160();//destructor
31 AliTPCBuffer160(const AliTPCBuffer160 &source); // copy constructor
32 AliTPCBuffer160& operator=(const AliTPCBuffer160 &source); // ass. op.
33 void FillBuffer(Int_t Val);
34 //this method store a word into the buffer
35 Int_t GetFreeCellNumber()const{return fFreeCellBuffer;}
36 //this method return the number of free cells of the internal buffer
37 Int_t GetNextBackWord();
38 //this method return the next word of 10 bit (reading the file backward) if it exists -1 otherwise
40 //this method return the next word of 10 bit (reading the file forward) if it exists -1 otherwise
41 void WriteTrailer(Int_t WordsNumber,Int_t PadNumber,Int_t RowNumber,Int_t SecNumber);
42 //this method is used to write the trailer
43 void ReadTrailer(Int_t &WordsNumber,Int_t &PadNumber,Int_t &RowNumber,Int_t &SecNumber);
44 //this method is used to read the trailer when the file is read forward
45 Int_t ReadTrailerBackward(Int_t &WordsNumber,Int_t &PadNumber,Int_t &RowNumber,Int_t &SecNumber);
46 //this method is used to read the trailer when the file is read backward
47 void WriteMiniHeader(ULong_t Size,Int_t SecNumber,Int_t SubSector,Int_t Detector,Int_t Flag );
48 //this method is used to write the Mini header
49 void SetVerbose(Int_t val){fVerbose=val;}
50 //this method is used to set the verbose level
51 //level 0 no output messages
52 //level !=0 some messages are displayed during the run
54 //this method is used to fill the buffer with 2AA hexadecimal value and save it into the output file
55 Int_t GetFillWordsNum()const{return fEndingFillWords;}
57 void PackWord(ULong_t &BaseWord, ULong_t Word, Int_t StartBit, Int_t StopBit);
58 //this method is used to pack bits into a word of 32 bits
59 void UnpackWord(ULong_t PackedWord, Int_t StartBit, Int_t StopBit, ULong_t &Word);
60 //this method is used to read a precise number of bits from a word of 32 bits
61 ULong_t fBuffer[5]; //Buffer dimension is 32*5=160 bits and it contains 16 values
62 //A value is never splitted in two Buffer
65 Int_t fShift; //This variable contains the number of free bits in the current cell of
66 //the Buffer after that the value Val is been inserted.
67 //size of Int_t is 32 bit that is the same size of a cell of Buffer so
68 //the shift operation are performed only on value Val.
69 Int_t fCurrentCell; //This variable contains the cell number of the cell currently used
70 Int_t fFreeCellBuffer;//number of free cells of the buffer
71 Int_t fFlag; //0 read 1 write
72 Int_t fVerbose; //verbose level
73 fstream f; //logical name of the I/O file
74 Int_t fMaskBackward; //bit mask for backward reading of a file
75 ULong_t fFilePosition;//'pointer' to the actual position in the file
76 ULong_t fFileEnd; //position of the last element of the file (File dimension)
77 ULong_t fMiniHeaderPos;//Mini header position
78 Int_t fEndingFillWords;//Few words at the end of the stream
79 ClassDef(AliTPCBuffer160,1)