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866e5b51 FC |
1 | /******************************************************************************* |
2 | * Copyright (c) 2011-2012 Ericsson, Ecole Polytechnique de Montreal and others | |
3 | * | |
4 | * All rights reserved. This program and the accompanying materials are made | |
5 | * available under the terms of the Eclipse Public License v1.0 which | |
6 | * accompanies this distribution, and is available at | |
7 | * http://www.eclipse.org/legal/epl-v10.html | |
8 | * | |
9 | * Contributors: Matthew Khouzam - Initial API and implementation | |
10 | * Contributors: Simon Marchi - Initial API and implementation | |
11 | *******************************************************************************/ | |
12 | package org.eclipse.linuxtools.ctf.core.trace; | |
13 | ||
14 | import java.io.IOException; | |
15 | import java.nio.MappedByteBuffer; | |
16 | import java.nio.channels.FileChannel.MapMode; | |
17 | import java.util.Collection; | |
18 | import java.util.HashMap; | |
19 | ||
20 | import org.eclipse.linuxtools.ctf.core.event.EventDeclaration; | |
21 | import org.eclipse.linuxtools.ctf.core.event.EventDefinition; | |
866e5b51 FC |
22 | import org.eclipse.linuxtools.ctf.core.event.types.Definition; |
23 | import org.eclipse.linuxtools.ctf.core.event.types.EnumDefinition; | |
24 | import org.eclipse.linuxtools.ctf.core.event.types.IDefinitionScope; | |
25 | import org.eclipse.linuxtools.ctf.core.event.types.IntegerDefinition; | |
26 | import org.eclipse.linuxtools.ctf.core.event.types.StructDeclaration; | |
27 | import org.eclipse.linuxtools.ctf.core.event.types.StructDefinition; | |
28 | import org.eclipse.linuxtools.ctf.core.event.types.VariantDefinition; | |
ce2388e0 FC |
29 | import org.eclipse.linuxtools.internal.ctf.core.event.io.BitBuffer; |
30 | import org.eclipse.linuxtools.internal.ctf.core.trace.Stream; | |
31 | import org.eclipse.linuxtools.internal.ctf.core.trace.StreamInputPacketIndexEntry; | |
866e5b51 FC |
32 | |
33 | /** | |
d37aaa7f | 34 | * CTF trace packet reader. Reads the events of a packet of a trace file. |
5c7202b5 | 35 | * |
d37aaa7f FC |
36 | * @version 1.0 |
37 | * @author Matthew Khouzam | |
38 | * @author Simon Marchi | |
866e5b51 | 39 | */ |
bfe038ff | 40 | public class StreamInputPacketReader implements IDefinitionScope { |
866e5b51 FC |
41 | |
42 | // ------------------------------------------------------------------------ | |
43 | // Constants | |
44 | // ------------------------------------------------------------------------ | |
45 | ||
46 | /** | |
47 | * Reference to the index entry of the current packet. | |
48 | */ | |
49 | private StreamInputPacketIndexEntry currentPacket = null; | |
50 | ||
51 | /** | |
52 | * BitBuffer used to read the trace file. | |
53 | */ | |
54 | private final BitBuffer bitBuffer = new BitBuffer(); | |
55 | ||
56 | /** | |
57 | * StreamInputReader that uses this StreamInputPacketReader. | |
58 | */ | |
59 | private final StreamInputReader streamInputReader; | |
60 | ||
61 | /** | |
62 | * Last timestamp recorded. | |
63 | * | |
64 | * Needed to calculate the complete timestamp values for the events with | |
65 | * compact headers. | |
66 | */ | |
67 | private long lastTimestamp = 0; | |
68 | ||
69 | /** | |
70 | * Trace packet header. | |
71 | */ | |
72 | private StructDefinition tracePacketHeaderDef = null; | |
73 | ||
74 | /** | |
75 | * Stream packet context definition. | |
76 | */ | |
77 | private StructDefinition streamPacketContextDef = null; | |
78 | ||
79 | /** | |
80 | * Stream event header definition. | |
81 | */ | |
82 | private StructDefinition streamEventHeaderDef = null; | |
83 | ||
84 | /** | |
85 | * Stream event context definition. | |
86 | */ | |
87 | private StructDefinition streamEventContextDef = null; | |
88 | ||
89 | /** | |
90 | * Maps event ID to event definitions. | |
91 | */ | |
788ddcbc | 92 | private final HashMap<Long, EventDefinition> events; |
866e5b51 FC |
93 | |
94 | /** | |
95 | * CPU id of current packet. | |
96 | */ | |
97 | private int currentCpu = 0; | |
98 | ||
33656d8e MK |
99 | /** |
100 | * number of lost events in this packet | |
101 | */ | |
102 | private int lostEvents; | |
103 | ||
104 | private int lostSoFar; | |
105 | ||
5c7202b5 MK |
106 | private int lostEventsInThisPacket; |
107 | ||
866e5b51 FC |
108 | // ------------------------------------------------------------------------ |
109 | // Attributes | |
110 | // ------------------------------------------------------------------------ | |
111 | ||
112 | /** | |
113 | * Constructs a StreamInputPacketReader. | |
114 | * | |
115 | * @param streamInputReader | |
116 | * The StreamInputReader to which this packet reader belongs to. | |
117 | */ | |
118 | public StreamInputPacketReader(StreamInputReader streamInputReader) { | |
119 | this.streamInputReader = streamInputReader; | |
120 | ||
121 | /* | |
122 | * Set the BitBuffer's byte order. | |
123 | */ | |
ce2388e0 | 124 | getBitBuffer().setByteOrder(streamInputReader.getByteOrder()); |
866e5b51 | 125 | |
788ddcbc MK |
126 | events = streamInputReader.getStreamInput().getStream().getTrace() |
127 | .getEventDefs(streamInputReader.getStreamInput()); | |
866e5b51 FC |
128 | /* |
129 | * Create definitions needed to read the events. | |
130 | */ | |
131 | createDefinitions(); | |
33656d8e | 132 | |
788ddcbc MK |
133 | lostEvents = 0; |
134 | lostSoFar = 0; | |
866e5b51 FC |
135 | } |
136 | ||
137 | // ------------------------------------------------------------------------ | |
138 | // Constructors | |
139 | // ------------------------------------------------------------------------ | |
140 | ||
141 | // ------------------------------------------------------------------------ | |
142 | // Getters/Setters/Predicates | |
143 | // ------------------------------------------------------------------------ | |
144 | ||
9ac2eb62 MK |
145 | /** |
146 | * Gets the current packet | |
147 | * | |
148 | * @return the current packet | |
149 | */ | |
866e5b51 FC |
150 | public StreamInputPacketIndexEntry getCurrentPacket() { |
151 | return this.currentPacket; | |
152 | } | |
153 | ||
9ac2eb62 MK |
154 | /** |
155 | * Gets the steamPacketContext Definition | |
156 | * | |
157 | * @return steamPacketContext Definition | |
158 | */ | |
866e5b51 FC |
159 | public StructDefinition getStreamPacketContextDef() { |
160 | return this.streamPacketContextDef; | |
161 | } | |
162 | ||
9ac2eb62 MK |
163 | /** |
164 | * Gets the CPU (core) number | |
165 | * | |
166 | * @return the CPU (core) number | |
167 | */ | |
866e5b51 FC |
168 | public int getCPU() { |
169 | return this.currentCpu; | |
170 | } | |
171 | ||
172 | @Override | |
173 | public String getPath() { | |
174 | return ""; //$NON-NLS-1$ | |
175 | } | |
176 | ||
177 | // ------------------------------------------------------------------------ | |
178 | // Operations | |
179 | // ------------------------------------------------------------------------ | |
180 | ||
181 | /** | |
182 | * Creates definitions needed to read events (stream-defined and | |
183 | * event-defined). | |
184 | */ | |
185 | private void createDefinitions() { | |
186 | /* | |
187 | * Create trace packet header definition. | |
188 | */ | |
788ddcbc MK |
189 | final Stream currentStream = getStreamInputReader().getStreamInput() |
190 | .getStream(); | |
191 | StructDeclaration tracePacketHeaderDecl = currentStream.getTrace() | |
192 | .getPacketHeader(); | |
866e5b51 | 193 | if (tracePacketHeaderDecl != null) { |
788ddcbc MK |
194 | setTracePacketHeaderDef(tracePacketHeaderDecl.createDefinition( |
195 | this, "trace.packet.header")); //$NON-NLS-1$ | |
866e5b51 FC |
196 | } |
197 | ||
198 | /* | |
199 | * Create stream packet context definition. | |
200 | */ | |
788ddcbc MK |
201 | StructDeclaration streamPacketContextDecl = currentStream |
202 | .getPacketContextDecl(); | |
866e5b51 FC |
203 | if (streamPacketContextDecl != null) { |
204 | setStreamPacketContextDef(streamPacketContextDecl.createDefinition( | |
205 | this, "stream.packet.context")); //$NON-NLS-1$ | |
206 | } | |
207 | ||
208 | /* | |
209 | * Create stream event header definition. | |
210 | */ | |
788ddcbc MK |
211 | StructDeclaration streamEventHeaderDecl = currentStream |
212 | .getEventHeaderDecl(); | |
866e5b51 | 213 | if (streamEventHeaderDecl != null) { |
788ddcbc MK |
214 | setStreamEventHeaderDef(streamEventHeaderDecl.createDefinition( |
215 | this, "stream.event.header")); //$NON-NLS-1$ | |
866e5b51 FC |
216 | } |
217 | ||
218 | /* | |
219 | * Create stream event context definition. | |
220 | */ | |
788ddcbc MK |
221 | StructDeclaration streamEventContextDecl = currentStream |
222 | .getEventContextDecl(); | |
866e5b51 FC |
223 | if (streamEventContextDecl != null) { |
224 | setStreamEventContextDef(streamEventContextDecl.createDefinition( | |
225 | this, "stream.event.context")); //$NON-NLS-1$ | |
226 | } | |
227 | ||
228 | createEventDefinitions(); | |
229 | } | |
230 | ||
231 | /** | |
232 | * Creates definitions needed to read the event. (event-defined). | |
233 | */ | |
234 | private void createEventDefinitions() { | |
788ddcbc MK |
235 | Collection<EventDeclaration> eventDecls = getStreamInputReader() |
236 | .getStreamInput().getStream().getEvents().values(); | |
866e5b51 FC |
237 | |
238 | /* | |
239 | * Create definitions for each event. | |
240 | */ | |
241 | for (EventDeclaration event : eventDecls) { | |
788ddcbc MK |
242 | if (!events.containsKey(event.getId())) { |
243 | EventDefinition eventDef = event | |
244 | .createDefinition(getStreamInputReader()); | |
245 | events.put(event.getId(), eventDef); | |
246 | } | |
866e5b51 FC |
247 | } |
248 | } | |
249 | ||
250 | /** | |
251 | * Changes the current packet to the given one. | |
252 | * | |
253 | * @param currentPacket | |
254 | * The index entry of the packet to switch to. | |
255 | */ | |
256 | public void setCurrentPacket(StreamInputPacketIndexEntry currentPacket) { | |
257 | this.currentPacket = currentPacket; | |
258 | ||
259 | if (this.currentPacket != null) { | |
260 | /* | |
261 | * Change the map of the BitBuffer. | |
262 | */ | |
263 | MappedByteBuffer bb = null; | |
264 | try { | |
788ddcbc MK |
265 | bb = getStreamInputReader() |
266 | .getStreamInput() | |
267 | .getFileChannel() | |
268 | .map(MapMode.READ_ONLY, | |
269 | this.currentPacket.getOffsetBytes(), | |
270 | (this.currentPacket.getPacketSizeBits() + 7) / 8); | |
866e5b51 FC |
271 | } catch (IOException e) { |
272 | /* | |
273 | * The streamInputReader object is already allocated, so this | |
274 | * shouldn't fail bar some very bad kernel or RAM errors... | |
275 | */ | |
276 | e.printStackTrace(); | |
277 | } | |
278 | ||
279 | getBitBuffer().setByteBuffer(bb); | |
280 | ||
281 | /* | |
282 | * Read trace packet header. | |
283 | */ | |
284 | if (getTracePacketHeaderDef() != null) { | |
285 | getTracePacketHeaderDef().read(getBitBuffer()); | |
286 | } | |
287 | ||
288 | /* | |
289 | * Read stream packet context. | |
290 | */ | |
291 | if (getStreamPacketContextDef() != null) { | |
292 | getStreamPacketContextDef().read(getBitBuffer()); | |
33656d8e MK |
293 | /* |
294 | * Read CPU ID | |
295 | */ | |
296 | ||
788ddcbc MK |
297 | Definition cpuiddef = getStreamPacketContextDef() |
298 | .lookupDefinition("cpu_id"); //$NON-NLS-1$ | |
866e5b51 | 299 | if (cpuiddef instanceof IntegerDefinition) { |
788ddcbc MK |
300 | currentCpu = (int) ((IntegerDefinition) cpuiddef) |
301 | .getValue(); | |
866e5b51 | 302 | } |
33656d8e MK |
303 | /* |
304 | * Read number of lost events | |
305 | */ | |
788ddcbc MK |
306 | Definition lostEventsdef = getStreamPacketContextDef() |
307 | .lookupDefinition("events_discarded"); //$NON-NLS-1$ | |
33656d8e | 308 | if (cpuiddef instanceof IntegerDefinition) { |
5c7202b5 | 309 | int totalLostEvents = (int) ((IntegerDefinition) lostEventsdef) |
788ddcbc | 310 | .getValue(); |
5c7202b5 MK |
311 | lostEventsInThisPacket = totalLostEvents - lostEvents; |
312 | lostEvents = totalLostEvents; | |
313 | currentPacket.setLostEvents(lostEventsInThisPacket); | |
314 | lostSoFar = 0; | |
33656d8e | 315 | } |
866e5b51 FC |
316 | } |
317 | ||
318 | /* | |
319 | * Use the timestamp begin of the packet as the reference for the | |
320 | * timestamp reconstitution. | |
321 | */ | |
ce2388e0 | 322 | lastTimestamp = currentPacket.getTimestampBegin(); |
866e5b51 FC |
323 | } else { |
324 | getBitBuffer().setByteBuffer(null); | |
325 | ||
326 | lastTimestamp = 0; | |
327 | } | |
328 | } | |
329 | ||
330 | /** | |
331 | * Returns whether it is possible to read any more events from this packet. | |
332 | * | |
333 | * @return True if it is possible to read any more events from this packet. | |
334 | */ | |
335 | public boolean hasMoreEvents() { | |
336 | if (currentPacket != null) { | |
788ddcbc MK |
337 | return getBitBuffer().position() < currentPacket |
338 | .getContentSizeBits(); | |
866e5b51 FC |
339 | } |
340 | return false; | |
341 | } | |
342 | ||
343 | /** | |
344 | * Reads the next event of the packet into the right event definition. | |
345 | * | |
346 | * @return The event definition containing the event data that was just | |
347 | * read. | |
348 | * @throws CTFReaderException | |
be6df2d8 | 349 | * If there was a problem reading the trace |
866e5b51 FC |
350 | */ |
351 | public EventDefinition readNextEvent() throws CTFReaderException { | |
352 | /* WARNING: This is very LTTng-specific. */ | |
866e5b51 FC |
353 | Long eventID = null; |
354 | long timestamp = 0; | |
355 | ||
5c7202b5 | 356 | if (lostEventsInThisPacket > lostSoFar) { |
788ddcbc MK |
357 | EventDefinition eventDef = EventDeclaration |
358 | .getLostEventDeclaration().createDefinition( | |
359 | streamInputReader); | |
aa572e22 | 360 | eventDef.setTimestamp(this.lastTimestamp); |
33656d8e MK |
361 | ++lostSoFar; |
362 | return eventDef; | |
363 | } | |
788ddcbc MK |
364 | StructDefinition sehd = getStreamEventHeaderDef(); // acronym for a long |
365 | // variable name | |
2b7f6f09 | 366 | BitBuffer currentBitBuffer = getBitBuffer(); |
866e5b51 | 367 | /* |
fd74e6c1 | 368 | * Read the stream event header. |
866e5b51 | 369 | */ |
2b7f6f09 MK |
370 | |
371 | if (sehd != null) { | |
372 | sehd.read(currentBitBuffer); | |
866e5b51 FC |
373 | |
374 | /* | |
375 | * Check for an event id. | |
376 | */ | |
788ddcbc MK |
377 | EnumDefinition idEnumDef = (EnumDefinition) sehd |
378 | .lookupDefinition("id"); //$NON-NLS-1$ | |
866e5b51 FC |
379 | assert (idEnumDef != null); |
380 | ||
381 | eventID = idEnumDef.getIntegerValue(); | |
382 | ||
383 | /* | |
384 | * Check for the variant v. | |
385 | */ | |
788ddcbc MK |
386 | VariantDefinition variantDef = (VariantDefinition) sehd |
387 | .lookupDefinition("v"); //$NON-NLS-1$ | |
866e5b51 FC |
388 | assert (variantDef != null); |
389 | ||
390 | /* | |
391 | * Get the variant current field | |
392 | */ | |
788ddcbc MK |
393 | StructDefinition variantCurrentField = (StructDefinition) variantDef |
394 | .getCurrentField(); | |
866e5b51 FC |
395 | assert (variantCurrentField != null); |
396 | ||
397 | /* | |
398 | * Try to get the id field in the current field of the variant. If | |
399 | * it is present, it overrides the previously read event id. | |
400 | */ | |
788ddcbc MK |
401 | IntegerDefinition idIntegerDef = (IntegerDefinition) variantCurrentField |
402 | .lookupDefinition("id"); //$NON-NLS-1$ | |
866e5b51 FC |
403 | if (idIntegerDef != null) { |
404 | eventID = idIntegerDef.getValue(); | |
866e5b51 FC |
405 | } |
406 | ||
407 | /* | |
408 | * Get the timestamp. | |
409 | */ | |
788ddcbc MK |
410 | IntegerDefinition timestampDef = (IntegerDefinition) variantCurrentField |
411 | .lookupDefinition("timestamp"); //$NON-NLS-1$ | |
866e5b51 FC |
412 | assert (timestampDef != null); |
413 | ||
414 | /* | |
415 | * Calculate the event timestamp. | |
416 | */ | |
417 | timestamp = calculateTimestamp(timestampDef); | |
418 | } | |
419 | ||
420 | /* | |
421 | * Read the stream event context. | |
422 | */ | |
423 | if (getStreamEventContextDef() != null) { | |
2b7f6f09 | 424 | getStreamEventContextDef().read(currentBitBuffer); |
866e5b51 FC |
425 | } |
426 | ||
427 | /* | |
428 | * Get the right event definition using the event id. | |
429 | */ | |
430 | EventDefinition eventDef = events.get(eventID); | |
431 | if (eventDef == null) { | |
432 | throw new CTFReaderException("Incorrect event id : " + eventID); //$NON-NLS-1$ | |
433 | } | |
434 | ||
435 | /* | |
436 | * Read the event context. | |
437 | */ | |
aa572e22 MK |
438 | if (eventDef.getContext() != null) { |
439 | eventDef.getContext().read(currentBitBuffer); | |
866e5b51 FC |
440 | } |
441 | ||
442 | /* | |
443 | * Read the event fields. | |
444 | */ | |
aa572e22 MK |
445 | if (eventDef.getFields() != null) { |
446 | eventDef.getFields().read(currentBitBuffer); | |
866e5b51 FC |
447 | } |
448 | ||
449 | /* | |
450 | * Set the event timestamp using the timestamp calculated by | |
451 | * updateTimestamp. | |
452 | */ | |
aa572e22 | 453 | eventDef.setTimestamp(timestamp); |
866e5b51 FC |
454 | |
455 | return eventDef; | |
456 | } | |
457 | ||
458 | /** | |
459 | * Calculates the timestamp value of the event, possibly using the timestamp | |
460 | * from the last event. | |
461 | * | |
462 | * @param timestampDef | |
463 | * Integer definition of the timestamp. | |
464 | * @return The calculated timestamp value. | |
465 | */ | |
466 | private long calculateTimestamp(IntegerDefinition timestampDef) { | |
467 | long newval; | |
468 | long majorasbitmask; | |
469 | int len = timestampDef.getDeclaration().getLength(); | |
470 | ||
471 | /* | |
472 | * If the timestamp length is 64 bits, it is a full timestamp. | |
473 | */ | |
474 | if (timestampDef.getDeclaration().getLength() == 64) { | |
475 | lastTimestamp = timestampDef.getValue(); | |
476 | return lastTimestamp; | |
477 | } | |
478 | ||
479 | /* | |
480 | * Bit mask to keep / remove all old / new bits. | |
481 | */ | |
482 | majorasbitmask = (1L << len) - 1; | |
483 | ||
484 | /* | |
485 | * If the new value is smaller than the corresponding bits of the last | |
486 | * timestamp, we assume an overflow of the compact representation. | |
487 | */ | |
488 | newval = timestampDef.getValue(); | |
489 | if (newval < (lastTimestamp & majorasbitmask)) { | |
490 | newval = newval + (1L << len); | |
491 | } | |
492 | ||
493 | /* Keep only the high bits of the old value */ | |
494 | lastTimestamp = lastTimestamp & ~majorasbitmask; | |
495 | ||
496 | /* Then add the low bits of the new value */ | |
497 | lastTimestamp = lastTimestamp + newval; | |
498 | ||
499 | return lastTimestamp; | |
500 | } | |
501 | ||
502 | @Override | |
503 | public Definition lookupDefinition(String lookupPath) { | |
504 | // TODO Auto-generated method stub | |
505 | return null; | |
506 | } | |
507 | ||
9ac2eb62 MK |
508 | /** |
509 | * Gets the stream event context definition (see CTF specs) | |
510 | * | |
511 | * @return the definition of the stream event context (the form not the | |
512 | * content) | |
513 | */ | |
866e5b51 FC |
514 | public StructDefinition getStreamEventContextDef() { |
515 | return this.streamEventContextDef; | |
516 | } | |
517 | ||
9ac2eb62 MK |
518 | /** |
519 | * Sets the stream event context definition | |
520 | * | |
521 | * @param streamEventContextDef | |
522 | * The stream event context definition | |
523 | */ | |
866e5b51 FC |
524 | public void setStreamEventContextDef(StructDefinition streamEventContextDef) { |
525 | this.streamEventContextDef = streamEventContextDef; | |
526 | } | |
527 | ||
9ac2eb62 MK |
528 | /** |
529 | * Gets the stream event header definition | |
530 | * | |
531 | * @return the stream event header definition | |
532 | */ | |
866e5b51 FC |
533 | public StructDefinition getStreamEventHeaderDef() { |
534 | return this.streamEventHeaderDef; | |
535 | } | |
536 | ||
9ac2eb62 MK |
537 | /** |
538 | * Sets the stream event header definition | |
539 | * | |
540 | * @param streamEventHeaderDef | |
541 | * the stream event header definition | |
542 | */ | |
866e5b51 FC |
543 | public void setStreamEventHeaderDef(StructDefinition streamEventHeaderDef) { |
544 | this.streamEventHeaderDef = streamEventHeaderDef; | |
545 | } | |
546 | ||
9ac2eb62 MK |
547 | /** |
548 | * Sets the stream packet context definition | |
549 | * | |
550 | * @param streamPacketContextDef | |
551 | * the stream packet context definition | |
552 | */ | |
788ddcbc MK |
553 | public void setStreamPacketContextDef( |
554 | StructDefinition streamPacketContextDef) { | |
866e5b51 FC |
555 | this.streamPacketContextDef = streamPacketContextDef; |
556 | } | |
557 | ||
9ac2eb62 MK |
558 | /** |
559 | * Gets the trace packet header definition | |
560 | * | |
561 | * @return the trace packet header definition | |
562 | */ | |
866e5b51 FC |
563 | public StructDefinition getTracePacketHeaderDef() { |
564 | return this.tracePacketHeaderDef; | |
565 | } | |
566 | ||
9ac2eb62 MK |
567 | /** |
568 | * Sets the trace packet header definition | |
569 | * | |
570 | * @param tracePacketHeaderDef | |
571 | * the trace packet header definition | |
572 | */ | |
866e5b51 FC |
573 | public void setTracePacketHeaderDef(StructDefinition tracePacketHeaderDef) { |
574 | this.tracePacketHeaderDef = tracePacketHeaderDef; | |
575 | } | |
576 | ||
9ac2eb62 MK |
577 | /** |
578 | * @return the parent stream input reader | |
579 | */ | |
866e5b51 FC |
580 | public StreamInputReader getStreamInputReader() { |
581 | return this.streamInputReader; | |
582 | } | |
583 | ||
9ac2eb62 MK |
584 | /** |
585 | * | |
586 | * @return THe bit buffer that reads the file. | |
587 | */ | |
866e5b51 FC |
588 | public BitBuffer getBitBuffer() { |
589 | return bitBuffer; | |
590 | } | |
591 | } |