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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), | |
f3c1e83c | 34 | fPosition(0), |
35 | fEquipmentId(-1) | |
7ab595b2 | 36 | { |
37 | // create an object to read digits from | |
38 | // the given memory location | |
39 | ||
40 | fHeader = new AliRawDataHeader; | |
41 | } | |
42 | ||
43 | AliRawReaderMemory::AliRawReaderMemory(UChar_t* memory, UInt_t size) : | |
44 | fBuffer(memory), | |
45 | fBufferSize(size), | |
f3c1e83c | 46 | fPosition(0), |
47 | fEquipmentId(-1) | |
7ab595b2 | 48 | { |
49 | // create an object to read digits from the given memory | |
50 | ||
51 | fHeader = new AliRawDataHeader; | |
52 | } | |
53 | ||
54 | AliRawReaderMemory::~AliRawReaderMemory() | |
55 | { | |
56 | // close the input memory | |
57 | ||
58 | delete fHeader; | |
59 | } | |
60 | ||
299738b9 | 61 | void AliRawReaderMemory::RequireHeader(Bool_t required) |
62 | { | |
63 | // Reading of raw data in case of missing | |
64 | // raw data header is not implemented for | |
65 | // this class | |
66 | if (!required) | |
67 | Fatal("AliRawReaderMemory","Reading of raw data without raw data header is not implemented !"); | |
68 | ||
69 | AliRawReader::RequireHeader(required); | |
70 | } | |
71 | ||
7ab595b2 | 72 | Bool_t AliRawReaderMemory::ReadHeader() |
73 | { | |
74 | // read a data header at the current buffer position | |
75 | // returns kFALSE if the mini header could not be read | |
76 | ||
77 | if (!fBuffer) return kFALSE; | |
78 | do { | |
79 | if ( fPosition+fCount+sizeof(AliRawDataHeader) > fBufferSize ) return kFALSE; | |
80 | ||
81 | memcpy( fHeader, fBuffer+fPosition+fCount, sizeof(AliRawDataHeader) ); | |
299738b9 | 82 | if (fHeader->fSize == 0) { |
83 | Warning("ReadHeader", | |
84 | "Missing raw data header! Using the size of the memory buffer instead (%d) !", | |
85 | fBufferSize - fPosition - fCount); | |
86 | fHeader->fSize = fBufferSize - fPosition - fCount; | |
87 | } | |
88 | fPosition += fCount + sizeof(AliRawDataHeader); | |
7ab595b2 | 89 | |
90 | if (fHeader->fSize != 0xFFFFFFFF) { | |
91 | // Check for fHeader->fSize < sizeof(AliRawDataHeader) ???? | |
92 | fCount = fHeader->fSize - sizeof(AliRawDataHeader); | |
93 | } else { | |
94 | fCount = fBufferSize-fPosition; | |
95 | } | |
96 | } while (!IsSelected()); | |
97 | return kTRUE; | |
98 | } | |
99 | ||
100 | Bool_t AliRawReaderMemory::ReadNextData(UChar_t*& data) | |
101 | { | |
102 | // reads the next payload at the current buffer position | |
103 | // returns kFALSE if the data could not be read | |
104 | ||
105 | while (fCount == 0) { | |
106 | if (!ReadHeader()) return kFALSE; | |
107 | } | |
108 | UInt_t currentPosition = fPosition; | |
109 | fPosition += fCount; | |
110 | fCount = 0; | |
111 | ||
112 | data = fBuffer+currentPosition; | |
113 | return kTRUE; | |
114 | } | |
115 | ||
116 | Bool_t AliRawReaderMemory::ReadNext(UChar_t* data, Int_t size) | |
117 | { | |
118 | // reads the next block of data at the current buffer position | |
119 | // returns kFALSE if the data could not be read | |
120 | ||
121 | if ( fBufferSize-fPosition < (UInt_t)size ) return kFALSE; | |
122 | ||
123 | memcpy( data, fBuffer+fPosition, size ); | |
124 | fCount -= size; | |
125 | fPosition += size; | |
126 | return kTRUE; | |
127 | } | |
128 | ||
129 | ||
130 | Bool_t AliRawReaderMemory::Reset() | |
131 | { | |
132 | // reset the current position in the buffer to the beginning of the curevent | |
133 | ||
134 | fCount = 0; | |
135 | fPosition = 0; | |
136 | return kTRUE; | |
137 | } | |
138 | ||
139 | Bool_t AliRawReaderMemory::NextEvent() | |
140 | { | |
141 | // each memory buffer always contains only one event | |
142 | return kFALSE; | |
143 | } | |
144 | ||
145 | Bool_t AliRawReaderMemory::RewindEvents() | |
146 | { | |
147 | // reset the event counter | |
148 | ||
149 | return Reset(); | |
150 | } | |
151 | ||
152 | Bool_t AliRawReaderMemory::SetMemory( UChar_t* memory, ULong_t size ) | |
153 | { | |
154 | fBuffer = memory; | |
155 | fBufferSize = size; | |
156 | fCount = 0; | |
157 | fPosition = 0; | |
158 | return (fBuffer && fBufferSize>0) ? kTRUE : kFALSE; | |
159 | } | |
160 |