Corrected protection.
[u/mrichter/AliRoot.git] / STEER / AliFstream.cxx
CommitLineData
18de460b 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
16//-----------------------------------------------------------------
17// This is the class which is to be used during the writing of
18// simulated raw data (DDL files format).
19// It is using the root functionality in order to deal correctly
20// with little/big endian issue. By convention the detector raw
21// data payload is stored always with little endian (this corresponds
22// to the real life situation when the detector data is coming from
23// the hardware). The implementation of this class is based on Root
24// tobuf() method defined in Bytes.h
25//-------------------------------------------------------------------------
26
27#include <unistd.h>
28#include <Riostream.h>
e3adf4cb 29#include <stdio.h>
18de460b 30#include "AliFstream.h"
31#include "AliLog.h"
32
e3adf4cb 33
18de460b 34ClassImp(AliFstream)
35
36//______________________________________________________________________________
37AliFstream::AliFstream():
38 fFile(0x0),
39 fBuffer(0x0),
e3adf4cb 40 fBufferSize(0)
18de460b 41{
42 // Default constructor
18de460b 43}
44
45//______________________________________________________________________________
46AliFstream::AliFstream(const char *fileName):
47 fFile(0x0),
48 fBuffer(0x0),
e3adf4cb 49 fBufferSize(0)
18de460b 50{
51 // Constructor
52 // Takes the input filename and
53 // opens the output stream
54
55#ifndef __DECCXX
56 fFile = new fstream(fileName, ios::binary|ios::out);
57#else
58 fFile = new fstream(fileName, ios::out);
59#endif
18de460b 60}
61
62//______________________________________________________________________________
18de460b 63AliFstream::~AliFstream()
64{
65 // Destructor
66 //
67 if (fFile) {
68 fFile->close();
69 delete fFile;
70 }
71 if (fBuffer) delete [] fBuffer;
72}
73
74//______________________________________________________________________________
41008432 75void AliFstream::Seekp(UInt_t position)
18de460b 76{
77 // Go to a given position
78 // inside the output stream
41008432 79 if (fFile) fFile->seekp(position);
18de460b 80}
81
82//______________________________________________________________________________
41008432 83UInt_t AliFstream::Tellp()
18de460b 84{
85 // Return the current
86 // position inside the
87 // output stream
41008432 88 if (fFile) return fFile->tellp();
18de460b 89 else return 0;
90}
91
92//______________________________________________________________________________
e3adf4cb 93UInt_t AliFstream::Swap(UInt_t x)
94{
95 // Swap the endianess of the integer value 'x'
96
97 return (((x & 0x000000ffU) << 24) | ((x & 0x0000ff00U) << 8) |
98 ((x & 0x00ff0000U) >> 8) | ((x & 0xff000000U) >> 24));
99}
100
101//______________________________________________________________________________
18de460b 102void AliFstream::WriteBuffer(const char *buffer, UInt_t size, Bool_t force)
103{
104 // Write the buffer to a file
105 // In case the user gives a 'force'
106 // flag then the buffer is written
107 // as it is. Otherwise, we check the
108 // endianess and swap the buffer data
109 // so that it is always stored using
110 // little endian format.
41008432 111
112 // The raw data payload size is always
113 // 4 bytes aligned
e3adf4cb 114
115 if ((size % sizeof(UInt_t)) != 0)
41008432 116 AliFatal(Form("Size of the buffer is not multiple of 4 (size = %d) !",size));
e3adf4cb 117
18de460b 118 if (force) {
119 fFile->write(buffer,size);
120 }
121 else {
e3adf4cb 122#ifdef R__BYTESWAP
123 fFile->write(buffer,size);
124#else
125 size /= sizeof(UInt_t);
126
127 if (size > fBufferSize) {
128 if (fBuffer) delete [] fBuffer;
129 fBuffer = new UInt_t[size];
130 fBufferSize = size;
18de460b 131 }
e3adf4cb 132
133 UInt_t *buf = (UInt_t *)buffer;
134 for (UInt_t i = 0; i < size; i++, buf++) {
135 UInt_t value = Swap(*buf);
136 memcpy(fBuffer+i, &value, sizeof(UInt_t));
18de460b 137 }
e3adf4cb 138
139 fFile->write((const char *)fBuffer,size*sizeof(UInt_t));
140#endif
18de460b 141 }
142}