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7ab595b2 | 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 | /* $Id$ */ | |
17 | ||
18 | /////////////////////////////////////////////////////////////////////////////// | |
19 | /// | |
20 | /// This is a class for reading raw data memory buffers. | |
21 | /// | |
22 | /////////////////////////////////////////////////////////////////////////////// | |
23 | ||
24 | #include "AliRawReaderMemory.h" | |
25 | #include <TSystem.h> | |
26 | ||
27 | ||
28 | ClassImp(AliRawReaderMemory) | |
29 | ||
30 | ||
31 | AliRawReaderMemory::AliRawReaderMemory() : | |
32 | fBuffer(NULL), | |
33 | fBufferSize(0), | |
34 | fPosition(0) | |
35 | { | |
36 | // create an object to read digits from | |
37 | // the given memory location | |
38 | ||
39 | fHeader = new AliRawDataHeader; | |
40 | } | |
41 | ||
42 | AliRawReaderMemory::AliRawReaderMemory(UChar_t* memory, UInt_t size) : | |
43 | fBuffer(memory), | |
44 | fBufferSize(size), | |
45 | fPosition(0) | |
46 | { | |
47 | // create an object to read digits from the given memory | |
48 | ||
49 | fHeader = new AliRawDataHeader; | |
50 | } | |
51 | ||
52 | AliRawReaderMemory::~AliRawReaderMemory() | |
53 | { | |
54 | // close the input memory | |
55 | ||
56 | delete fHeader; | |
57 | } | |
58 | ||
59 | ||
60 | AliRawReaderMemory::AliRawReaderMemory(const AliRawReaderMemory& rawReader) : | |
61 | AliRawReader(rawReader) | |
62 | { | |
63 | Fatal("AliRawReaderMemory", "copy constructor not implemented"); | |
64 | } | |
65 | ||
66 | AliRawReaderMemory& AliRawReaderMemory::operator = (const AliRawReaderMemory& | |
67 | /* rawReader */) | |
68 | { | |
69 | Fatal("operator =", "assignment operator not implemented"); | |
70 | return *this; | |
71 | } | |
72 | ||
73 | Bool_t AliRawReaderMemory::ReadHeader() | |
74 | { | |
75 | // read a data header at the current buffer position | |
76 | // returns kFALSE if the mini header could not be read | |
77 | ||
78 | if (!fBuffer) return kFALSE; | |
79 | do { | |
80 | if ( fPosition+fCount+sizeof(AliRawDataHeader) > fBufferSize ) return kFALSE; | |
81 | ||
82 | memcpy( fHeader, fBuffer+fPosition+fCount, sizeof(AliRawDataHeader) ); | |
83 | fPosition += fCount+sizeof(AliRawDataHeader); | |
84 | ||
85 | if (fHeader->fSize != 0xFFFFFFFF) { | |
86 | // Check for fHeader->fSize < sizeof(AliRawDataHeader) ???? | |
87 | fCount = fHeader->fSize - sizeof(AliRawDataHeader); | |
88 | } else { | |
89 | fCount = fBufferSize-fPosition; | |
90 | } | |
91 | } while (!IsSelected()); | |
92 | return kTRUE; | |
93 | } | |
94 | ||
95 | Bool_t AliRawReaderMemory::ReadNextData(UChar_t*& data) | |
96 | { | |
97 | // reads the next payload at the current buffer position | |
98 | // returns kFALSE if the data could not be read | |
99 | ||
100 | while (fCount == 0) { | |
101 | if (!ReadHeader()) return kFALSE; | |
102 | } | |
103 | UInt_t currentPosition = fPosition; | |
104 | fPosition += fCount; | |
105 | fCount = 0; | |
106 | ||
107 | data = fBuffer+currentPosition; | |
108 | return kTRUE; | |
109 | } | |
110 | ||
111 | Bool_t AliRawReaderMemory::ReadNext(UChar_t* data, Int_t size) | |
112 | { | |
113 | // reads the next block of data at the current buffer position | |
114 | // returns kFALSE if the data could not be read | |
115 | ||
116 | if ( fBufferSize-fPosition < (UInt_t)size ) return kFALSE; | |
117 | ||
118 | memcpy( data, fBuffer+fPosition, size ); | |
119 | fCount -= size; | |
120 | fPosition += size; | |
121 | return kTRUE; | |
122 | } | |
123 | ||
124 | ||
125 | Bool_t AliRawReaderMemory::Reset() | |
126 | { | |
127 | // reset the current position in the buffer to the beginning of the curevent | |
128 | ||
129 | fCount = 0; | |
130 | fPosition = 0; | |
131 | return kTRUE; | |
132 | } | |
133 | ||
134 | Bool_t AliRawReaderMemory::NextEvent() | |
135 | { | |
136 | // each memory buffer always contains only one event | |
137 | return kFALSE; | |
138 | } | |
139 | ||
140 | Bool_t AliRawReaderMemory::RewindEvents() | |
141 | { | |
142 | // reset the event counter | |
143 | ||
144 | return Reset(); | |
145 | } | |
146 | ||
147 | Bool_t AliRawReaderMemory::SetMemory( UChar_t* memory, ULong_t size ) | |
148 | { | |
149 | fBuffer = memory; | |
150 | fBufferSize = size; | |
151 | fCount = 0; | |
152 | fPosition = 0; | |
153 | return (fBuffer && fBufferSize>0) ? kTRUE : kFALSE; | |
154 | } | |
155 |