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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 | 34 | ClassImp(AliFstream) |
35 | ||
36 | //______________________________________________________________________________ | |
37 | AliFstream::AliFstream(): | |
38 | fFile(0x0), | |
39 | fBuffer(0x0), | |
e3adf4cb | 40 | fBufferSize(0) |
18de460b | 41 | { |
42 | // Default constructor | |
18de460b | 43 | } |
44 | ||
45 | //______________________________________________________________________________ | |
46 | AliFstream::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 | ||
18de460b | 62 | //______________________________________________________________________________ |
63 | AliFstream::~AliFstream() | |
64 | { | |
65 | // Destructor | |
66 | // | |
67 | if (fFile) { | |
68 | fFile->close(); | |
69 | delete fFile; | |
70 | } | |
71 | if (fBuffer) delete [] fBuffer; | |
72 | } | |
73 | ||
74 | //______________________________________________________________________________ | |
41008432 | 75 | void 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 | 83 | UInt_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 | ||
e3adf4cb | 92 | //______________________________________________________________________________ |
93 | UInt_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 | ||
18de460b | 101 | //______________________________________________________________________________ |
102 | void 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 | } |