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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 | |
7ab595b2 | 39 | } |
40 | ||
41 | AliRawReaderMemory::AliRawReaderMemory(UChar_t* memory, UInt_t size) : | |
42 | fBuffer(memory), | |
43 | fBufferSize(size), | |
f3c1e83c | 44 | fPosition(0), |
45 | fEquipmentId(-1) | |
7ab595b2 | 46 | { |
47 | // create an object to read digits from the given memory | |
7ab595b2 | 48 | } |
49 | ||
50 | AliRawReaderMemory::~AliRawReaderMemory() | |
51 | { | |
52 | // close the input memory | |
7ab595b2 | 53 | } |
54 | ||
299738b9 | 55 | void AliRawReaderMemory::RequireHeader(Bool_t required) |
56 | { | |
57 | // Reading of raw data in case of missing | |
58 | // raw data header is not implemented for | |
59 | // this class | |
60 | if (!required) | |
61 | Fatal("AliRawReaderMemory","Reading of raw data without raw data header is not implemented !"); | |
62 | ||
63 | AliRawReader::RequireHeader(required); | |
64 | } | |
65 | ||
7ab595b2 | 66 | Bool_t AliRawReaderMemory::ReadHeader() |
67 | { | |
68 | // read a data header at the current buffer position | |
69 | // returns kFALSE if the mini header could not be read | |
70 | ||
b6ae8ba1 | 71 | if (fEquipmentId == -1) |
72 | { | |
73 | Warning("ReadHeader", "The equipment ID is not set for the DDL memory buffer."); | |
74 | } | |
75 | ||
7ab595b2 | 76 | if (!fBuffer) return kFALSE; |
77 | do { | |
b6ae8ba1 | 78 | // Check if we would not read past the end of the buffer. |
7ab595b2 | 79 | if ( fPosition+fCount+sizeof(AliRawDataHeader) > fBufferSize ) return kFALSE; |
b6ae8ba1 | 80 | |
81 | fHeader = reinterpret_cast<AliRawDataHeader*>(fBuffer+fPosition+fCount); | |
82 | ||
83 | // Check that the header is sane, that is the size does not go past the buffer. | |
84 | // Otherwise try again at the next word location. | |
85 | if (fHeader->fSize == 0 or fPosition+fCount+fHeader->fSize > fBufferSize) { | |
86 | if (fPosition + sizeof(UInt_t) <= fBufferSize) { | |
87 | fPosition += sizeof(UInt_t); | |
88 | continue; | |
89 | } else { | |
90 | Error("ReadHeader", "Could not find a valid DDL header!"); | |
91 | return kFALSE; | |
299738b9 | 92 | } |
b6ae8ba1 | 93 | } else { |
94 | fPosition += fCount + sizeof(AliRawDataHeader); | |
95 | } | |
7ab595b2 | 96 | |
97 | if (fHeader->fSize != 0xFFFFFFFF) { | |
7ab595b2 | 98 | fCount = fHeader->fSize - sizeof(AliRawDataHeader); |
99 | } else { | |
b6ae8ba1 | 100 | fCount = fBufferSize - fPosition - sizeof(AliRawDataHeader); |
7ab595b2 | 101 | } |
102 | } while (!IsSelected()); | |
b6ae8ba1 | 103 | |
7ab595b2 | 104 | return kTRUE; |
105 | } | |
106 | ||
107 | Bool_t AliRawReaderMemory::ReadNextData(UChar_t*& data) | |
108 | { | |
109 | // reads the next payload at the current buffer position | |
110 | // returns kFALSE if the data could not be read | |
111 | ||
112 | while (fCount == 0) { | |
113 | if (!ReadHeader()) return kFALSE; | |
114 | } | |
115 | UInt_t currentPosition = fPosition; | |
116 | fPosition += fCount; | |
117 | fCount = 0; | |
118 | ||
119 | data = fBuffer+currentPosition; | |
120 | return kTRUE; | |
121 | } | |
122 | ||
123 | Bool_t AliRawReaderMemory::ReadNext(UChar_t* data, Int_t size) | |
124 | { | |
125 | // reads the next block of data at the current buffer position | |
126 | // returns kFALSE if the data could not be read | |
127 | ||
128 | if ( fBufferSize-fPosition < (UInt_t)size ) return kFALSE; | |
129 | ||
130 | memcpy( data, fBuffer+fPosition, size ); | |
131 | fCount -= size; | |
132 | fPosition += size; | |
133 | return kTRUE; | |
134 | } | |
135 | ||
136 | ||
137 | Bool_t AliRawReaderMemory::Reset() | |
138 | { | |
139 | // reset the current position in the buffer to the beginning of the curevent | |
140 | ||
b6ae8ba1 | 141 | fHeader = NULL; |
7ab595b2 | 142 | fCount = 0; |
143 | fPosition = 0; | |
144 | return kTRUE; | |
145 | } | |
146 | ||
147 | Bool_t AliRawReaderMemory::NextEvent() | |
148 | { | |
149 | // each memory buffer always contains only one event | |
59a76075 | 150 | if (fEventNumber < 0) { |
151 | fEventNumber++; | |
152 | return kTRUE; | |
153 | } | |
154 | else | |
155 | return kFALSE; | |
7ab595b2 | 156 | } |
157 | ||
158 | Bool_t AliRawReaderMemory::RewindEvents() | |
159 | { | |
160 | // reset the event counter | |
59a76075 | 161 | fEventNumber = -1; |
7ab595b2 | 162 | |
163 | return Reset(); | |
164 | } | |
165 | ||
166 | Bool_t AliRawReaderMemory::SetMemory( UChar_t* memory, ULong_t size ) | |
167 | { | |
168 | fBuffer = memory; | |
169 | fBufferSize = size; | |
b6ae8ba1 | 170 | fHeader = NULL; |
7ab595b2 | 171 | fCount = 0; |
172 | fPosition = 0; | |
173 | return (fBuffer && fBufferSize>0) ? kTRUE : kFALSE; | |
174 | } | |
175 |