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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 | fPosition(0), | |
33 | fBuffers(), | |
34 | fCurrent(0) | |
35 | { | |
36 | // create an object to read digits from | |
37 | // the given memory location | |
38 | } | |
39 | ||
40 | AliRawReaderMemory::AliRawReaderMemory(UChar_t* memory, UInt_t size) : | |
41 | fPosition(0), | |
42 | fBuffers(), | |
43 | fCurrent(0) | |
44 | { | |
45 | // create an object to read digits from the given memory | |
46 | fBuffers.push_back(AliRRMBuffer(memory, size, -1)); | |
47 | } | |
48 | ||
49 | AliRawReaderMemory::~AliRawReaderMemory() | |
50 | { | |
51 | // close the input memory | |
52 | } | |
53 | ||
54 | void AliRawReaderMemory::RequireHeader(Bool_t required) | |
55 | { | |
56 | // Reading of raw data in case of missing | |
57 | // raw data header is not implemented for | |
58 | // this class | |
59 | if (!required) | |
60 | Fatal("AliRawReaderMemory","Reading of raw data without raw data header is not implemented !"); | |
61 | ||
62 | AliRawReader::RequireHeader(required); | |
63 | } | |
64 | ||
65 | Bool_t AliRawReaderMemory::ReadHeader() | |
66 | { | |
67 | // read a data header at the current buffer position | |
68 | // returns kFALSE if the mini header could not be read | |
69 | ||
70 | Bool_t result=kFALSE; | |
71 | if (fCurrent>=fBuffers.size()) return kFALSE; | |
72 | ||
73 | do { | |
74 | result=kFALSE; | |
75 | do { | |
76 | if (fBuffers[fCurrent].GetEquipmentId() == -1) | |
77 | { | |
78 | Warning("ReadHeader", "The equipment ID is not set for the DDL memory buffer."); | |
79 | } | |
80 | if (!fBuffers[fCurrent].GetBuffer()) break; | |
81 | ||
82 | // Check if we would not read past the end of the buffer. | |
83 | if ( fPosition+fCount >= fBuffers[fCurrent].GetBufferSize() ) break; | |
84 | ||
85 | fHeader = reinterpret_cast<AliRawDataHeader*>(fBuffers[fCurrent].GetBuffer()+fPosition+fCount); | |
86 | ||
87 | // Check that the header is sane, that is the size does not go past the buffer. | |
88 | // Otherwise try again at the next word location. | |
89 | while (1) { | |
90 | if ( ( (fHeader->fSize == 0) || | |
91 | ((Int_t)fPosition + fCount + (Int_t)fHeader->fSize > (Int_t)fBuffers[fCurrent].GetBufferSize() ) ) | |
92 | && fHeader->fSize != 0xFFFFFFFF) { | |
93 | ||
94 | if (fPosition + sizeof(UInt_t) <= fBuffers[fCurrent].GetBufferSize()) { | |
95 | fPosition += sizeof(UInt_t); | |
96 | continue; | |
97 | } else { | |
98 | Error("ReadHeader", "Could not find a valid DDL header!"); | |
99 | return kFALSE; | |
100 | } | |
101 | } else { | |
102 | fPosition += fCount + sizeof(AliRawDataHeader); | |
103 | } | |
104 | break; | |
105 | } | |
106 | ||
107 | if (fHeader->fSize != 0xFFFFFFFF) { | |
108 | fCount = fHeader->fSize - sizeof(AliRawDataHeader); | |
109 | } else { | |
110 | fCount = fBuffers[fCurrent].GetBufferSize() - sizeof(AliRawDataHeader); | |
111 | } | |
112 | } while (!(result=IsSelected()) && OpenNextBuffer()); | |
113 | } while (!result && OpenNextBuffer()); | |
114 | ||
115 | return result; | |
116 | } | |
117 | ||
118 | Bool_t AliRawReaderMemory::OpenNextBuffer() | |
119 | { | |
120 | // increment to next buffer | |
121 | fPosition=0; | |
122 | fCount=0; | |
123 | if (fCurrent>=fBuffers.size()) return kFALSE; | |
124 | if (++fCurrent>=fBuffers.size()) return kFALSE; | |
125 | return kTRUE; | |
126 | } | |
127 | ||
128 | Bool_t AliRawReaderMemory::ReadNextData(UChar_t*& data) | |
129 | { | |
130 | // reads the next payload at the current buffer position | |
131 | // returns kFALSE if the data could not be read | |
132 | ||
133 | while (fCount == 0) { | |
134 | if (!ReadHeader()) return kFALSE; | |
135 | } | |
136 | ||
137 | if(fCount < 0){ | |
138 | Error("ReadNextData","Cannot read data, payload is negative"); | |
139 | return kFALSE; | |
140 | } | |
141 | ||
142 | UInt_t currentPosition = fPosition; | |
143 | fPosition += fCount; | |
144 | fCount = 0; | |
145 | ||
146 | if(fBuffers[fCurrent].GetBufferSize()<currentPosition){ | |
147 | Error("ReadNextData","Current position exceeds buffersize."); | |
148 | return kFALSE; | |
149 | } | |
150 | data = fBuffers[fCurrent].GetBuffer()+currentPosition; | |
151 | return kTRUE; | |
152 | } | |
153 | ||
154 | Bool_t AliRawReaderMemory::ReadNext(UChar_t* data, Int_t size) | |
155 | { | |
156 | // reads the next block of data at the current buffer position | |
157 | // but does not shift to the next equipment. The next equipment | |
158 | // must be activated by calling ReadHeader | |
159 | // returns kFALSE if the data could not be read | |
160 | ||
161 | ||
162 | if (fCurrent>=fBuffers.size()) return kFALSE; | |
163 | if ( fBuffers[fCurrent].GetBufferSize()-fPosition < (UInt_t)size ) return kFALSE; | |
164 | ||
165 | memcpy( data, fBuffers[fCurrent].GetBuffer()+fPosition, size ); | |
166 | fCount -= size; | |
167 | fPosition += size; | |
168 | return kTRUE; | |
169 | } | |
170 | ||
171 | ||
172 | Bool_t AliRawReaderMemory::Reset() | |
173 | { | |
174 | // reset the current position in the buffer to the beginning of the curevent | |
175 | ||
176 | fHeader = NULL; | |
177 | fCount = 0; | |
178 | fPosition = 0; | |
179 | fCurrent=0; | |
180 | return kTRUE; | |
181 | } | |
182 | ||
183 | Bool_t AliRawReaderMemory::NextEvent() | |
184 | { | |
185 | // each memory buffer always contains only one event | |
186 | if (fEventNumber < 0) { | |
187 | fEventNumber++; | |
188 | return kTRUE; | |
189 | } | |
190 | else | |
191 | return kFALSE; | |
192 | } | |
193 | ||
194 | Bool_t AliRawReaderMemory::RewindEvents() | |
195 | { | |
196 | // reset the event counter | |
197 | fEventNumber = -1; | |
198 | ||
199 | return Reset(); | |
200 | } | |
201 | ||
202 | Bool_t AliRawReaderMemory::SetMemory( UChar_t* memory, ULong_t size ) | |
203 | { | |
204 | // SetMemory function kept for backward compatibility, only allowed | |
205 | // if no blocks have been added so far | |
206 | if (!memory || size<=0) return kFALSE; | |
207 | if (fBuffers.size()>1 || (fBuffers.size()==1 && fPosition==0 && fCurrent==0)) { | |
208 | Error("SetMemory","can not SetMemory for multiple buffers, use AddBuffer(...)"); | |
209 | return kFALSE; | |
210 | } | |
211 | if (fBuffers.size()==1) fBuffers.pop_back(); | |
212 | fBuffers.push_back(AliRRMBuffer(memory, size, -1)); | |
213 | fCurrent=0; | |
214 | fHeader = NULL; | |
215 | fCount = 0; | |
216 | fPosition = 0; | |
217 | return kTRUE; | |
218 | } | |
219 | ||
220 | void AliRawReaderMemory::SetEquipmentID(Int_t id) | |
221 | { | |
222 | // SetMemory function kept for backward compatibility, only allowed | |
223 | // if no blocks have been added so far, set equipment id of the first | |
224 | // buffer | |
225 | if (fBuffers.size()>1) { | |
226 | Error("SetEquipmentID", "can not SetEquipmentID for multiple buffers, use AddBuffer(...)"); | |
227 | return; | |
228 | } | |
229 | if (fBuffers.size()==0 || fCurrent>=fBuffers.size()) { | |
230 | Error("SetEquipmentID", "no block available to set equipment id"); | |
231 | return; | |
232 | } | |
233 | fBuffers[fCurrent].SetEquipmentId(id); | |
234 | } | |
235 | ||
236 | Int_t AliRawReaderMemory::GetEquipmentSize() const | |
237 | { | |
238 | // get the size of the equipment, that is payload + CDH | |
239 | if (fCurrent>=fBuffers.size()) return 0; | |
240 | return fBuffers[fCurrent].GetBufferSize(); | |
241 | } | |
242 | ||
243 | Int_t AliRawReaderMemory::GetEquipmentId() const | |
244 | { | |
245 | // get the current equipment id | |
246 | if (fCurrent>=fBuffers.size()) return -1; | |
247 | return fBuffers[fCurrent].GetEquipmentId(); | |
248 | } | |
249 | ||
250 | Bool_t AliRawReaderMemory::AddBuffer(UChar_t* memory, ULong_t size, Int_t equipmentId ) | |
251 | { | |
252 | // Add a buffer to the list | |
253 | if (!memory || size<=0 || equipmentId<0 ) return kFALSE; | |
254 | fBuffers.push_back(AliRRMBuffer(memory, size, equipmentId)); | |
255 | return kTRUE; | |
256 | } | |
257 | ||
258 | void AliRawReaderMemory::ClearBuffers() | |
259 | { | |
260 | // Clear the buffer list | |
261 | fBuffers.clear(); | |
262 | Reset(); | |
263 | } | |
264 | ||
265 | AliRawReaderMemory::AliRRMBuffer::AliRRMBuffer() | |
266 | : | |
267 | fBuffer(NULL), | |
268 | fBufferSize(0), | |
269 | fEquipmentId(-1) | |
270 | { | |
271 | // ctor | |
272 | } | |
273 | ||
274 | AliRawReaderMemory::AliRRMBuffer::AliRRMBuffer(UChar_t* pBuffer, UInt_t bufferSize, Int_t equipmentId) | |
275 | : | |
276 | fBuffer(pBuffer), | |
277 | fBufferSize(bufferSize), | |
278 | fEquipmentId(equipmentId) | |
279 | { | |
280 | // ctor | |
281 | } | |
282 | ||
283 | AliRawReaderMemory::AliRRMBuffer::~AliRRMBuffer() | |
284 | { | |
285 | // dtor | |
286 | } | |
287 | ||
288 | AliRawReaderMemory::AliRRMBuffer::AliRRMBuffer(const AliRRMBuffer& src) | |
289 | : | |
290 | fBuffer(src.fBuffer), | |
291 | fBufferSize(src.fBufferSize), | |
292 | fEquipmentId(src.fEquipmentId) | |
293 | { | |
294 | // copy ctor, there are no buffers allocated internally, pointers | |
295 | // are just copied | |
296 | } | |
297 | ||
298 | AliRawReaderMemory::AliRRMBuffer& AliRawReaderMemory::AliRRMBuffer::operator=(const AliRRMBuffer& src) | |
299 | { | |
300 | // assignment op | |
301 | fBuffer=src.fBuffer; | |
302 | fBufferSize=src.fBufferSize; | |
303 | fEquipmentId=src.fEquipmentId; | |
304 | return *this; | |
305 | } |