forked from EarthScope/libmseed
-
Notifications
You must be signed in to change notification settings - Fork 0
/
unpack.c
1080 lines (895 loc) · 31.1 KB
/
unpack.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/***************************************************************************
* unpack.c:
*
* Generic routines to unpack Mini-SEED records.
*
* Appropriate values from the record header will be byte-swapped to
* the host order. The purpose of this code is to provide a portable
* way of accessing common SEED data record header information. All
* data structures in SEED 2.4 data records are supported. The data
* samples are optionally decompressed/unpacked.
*
* Written by Chad Trabant,
* ORFEUS/EC-Project MEREDIAN
* IRIS Data Management Center
*
* modified: 2016.273
***************************************************************************/
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "libmseed.h"
#include "unpackdata.h"
/* Function(s) internal to this file */
static int check_environment (int verbose);
/* Header and data byte order flags controlled by environment variables */
/* -2 = not checked, -1 = checked but not set, or 0 = LE and 1 = BE */
flag unpackheaderbyteorder = -2;
flag unpackdatabyteorder = -2;
/* Data encoding format/fallback controlled by environment variable */
/* -2 = not checked, -1 = checked but not set, or = encoding */
int unpackencodingformat = -2;
int unpackencodingfallback = -2;
/***************************************************************************
* msr_unpack:
*
* Unpack a SEED data record header/blockettes and populate a MSRecord
* struct. All approriate fields are byteswapped, if needed, and
* pointers to structured data are setup in addition to setting the
* common header fields.
*
* If 'dataflag' is true the data samples are unpacked/decompressed
* and the MSRecord->datasamples pointer is set appropriately. The
* data samples will be either 32-bit integers, 32-bit floats or
* 64-bit floats (doubles) with the same byte order as the host
* machine. The MSRecord->numsamples will be set to the actual number
* of samples unpacked/decompressed and MSRecord->sampletype will
* indicated the sample type.
*
* All appropriate values will be byte-swapped to the host order,
* including the data samples.
*
* All header values, blockette values and data samples will be
* overwritten by subsequent calls to this function.
*
* If the msr struct is NULL it will be allocated.
*
* Returns MS_NOERROR and populates the MSRecord struct at *ppmsr on
* success, otherwise returns a libmseed error code (listed in
* libmseed.h).
***************************************************************************/
int
msr_unpack (char *record, int reclen, MSRecord **ppmsr,
flag dataflag, flag verbose)
{
flag headerswapflag = 0;
flag dataswapflag = 0;
int retval;
MSRecord *msr = NULL;
char sequence_number[7];
char srcname[50];
/* For blockette parsing */
BlktLink *blkt_link = 0;
uint16_t blkt_type;
uint16_t next_blkt;
uint32_t blkt_offset;
uint32_t blkt_length;
int blkt_count = 0;
if (!ppmsr)
{
ms_log (2, "msr_unpack(): ppmsr argument cannot be NULL\n");
return MS_GENERROR;
}
/* Verify that record includes a valid header */
if (!MS_ISVALIDHEADER (record))
{
ms_recsrcname (record, srcname, 1);
ms_log (2, "msr_unpack(%s) Record header & quality indicator unrecognized: '%c'\n", srcname);
ms_log (2, "msr_unpack(%s) This is not a valid Mini-SEED record\n", srcname);
return MS_NOTSEED;
}
/* Verify that passed record length is within supported range */
if (reclen < MINRECLEN || reclen > MAXRECLEN)
{
ms_recsrcname (record, srcname, 1);
ms_log (2, "msr_unpack(%s): Record length is out of range: %d\n", srcname, reclen);
return MS_OUTOFRANGE;
}
/* Initialize the MSRecord */
if (!(*ppmsr = msr_init (*ppmsr)))
return MS_GENERROR;
/* Shortcut pointer, historical and help readability */
msr = *ppmsr;
/* Set raw record pointer and record length */
msr->record = record;
msr->reclen = reclen;
/* Check environment variables if necessary */
if (unpackheaderbyteorder == -2 ||
unpackdatabyteorder == -2 ||
unpackencodingformat == -2 ||
unpackencodingfallback == -2)
if (check_environment (verbose))
return MS_GENERROR;
/* Allocate and copy fixed section of data header */
msr->fsdh = realloc (msr->fsdh, sizeof (struct fsdh_s));
if (msr->fsdh == NULL)
{
ms_log (2, "msr_unpack(): Cannot allocate memory\n");
return MS_GENERROR;
}
memcpy (msr->fsdh, record, sizeof (struct fsdh_s));
/* Check to see if byte swapping is needed by testing the year and day */
if (!MS_ISVALIDYEARDAY (msr->fsdh->start_time.year, msr->fsdh->start_time.day))
headerswapflag = dataswapflag = 1;
/* Check if byte order is forced */
if (unpackheaderbyteorder >= 0)
{
headerswapflag = (ms_bigendianhost () != unpackheaderbyteorder) ? 1 : 0;
}
if (unpackdatabyteorder >= 0)
{
dataswapflag = (ms_bigendianhost () != unpackdatabyteorder) ? 1 : 0;
}
/* Swap byte order? */
if (headerswapflag)
{
MS_SWAPBTIME (&msr->fsdh->start_time);
ms_gswap2a (&msr->fsdh->numsamples);
ms_gswap2a (&msr->fsdh->samprate_fact);
ms_gswap2a (&msr->fsdh->samprate_mult);
ms_gswap4a (&msr->fsdh->time_correct);
ms_gswap2a (&msr->fsdh->data_offset);
ms_gswap2a (&msr->fsdh->blockette_offset);
}
/* Populate some of the common header fields */
strncpy (sequence_number, msr->fsdh->sequence_number, 6);
sequence_number[6] = '\0';
msr->sequence_number = (int32_t)strtol (sequence_number, NULL, 10);
msr->dataquality = msr->fsdh->dataquality;
ms_strncpcleantail (msr->network, msr->fsdh->network, 2);
ms_strncpcleantail (msr->station, msr->fsdh->station, 5);
ms_strncpcleantail (msr->location, msr->fsdh->location, 2);
ms_strncpcleantail (msr->channel, msr->fsdh->channel, 3);
msr->samplecnt = msr->fsdh->numsamples;
/* Generate source name for MSRecord */
if (msr_srcname (msr, srcname, 1) == NULL)
{
ms_log (2, "msr_unpack(): Cannot generate srcname\n");
return MS_GENERROR;
}
/* Report byte swapping status */
if (verbose > 2)
{
if (headerswapflag)
ms_log (1, "%s: Byte swapping needed for unpacking of header\n", srcname);
else
ms_log (1, "%s: Byte swapping NOT needed for unpacking of header\n", srcname);
}
/* Traverse the blockettes */
blkt_offset = msr->fsdh->blockette_offset;
while ((blkt_offset != 0) &&
((int)blkt_offset < reclen) &&
(blkt_offset < MAXRECLEN))
{
/* Every blockette has a similar 4 byte header: type and next */
memcpy (&blkt_type, record + blkt_offset, 2);
blkt_offset += 2;
memcpy (&next_blkt, record + blkt_offset, 2);
blkt_offset += 2;
if (headerswapflag)
{
ms_gswap2 (&blkt_type);
ms_gswap2 (&next_blkt);
}
/* Get blockette length */
blkt_length = ms_blktlen (blkt_type,
record + blkt_offset - 4,
headerswapflag);
if (blkt_length == 0)
{
ms_log (2, "msr_unpack(%s): Unknown blockette length for type %d\n",
srcname, blkt_type);
break;
}
/* Make sure blockette is contained within the msrecord buffer */
if ((int)(blkt_offset - 4 + blkt_length) > reclen)
{
ms_log (2, "msr_unpack(%s): Blockette %d extends beyond record size, truncated?\n",
srcname, blkt_type);
break;
}
if (blkt_type == 100)
{ /* Found a Blockette 100 */
struct blkt_100_s *blkt_100;
blkt_link = msr_addblockette (msr, record + blkt_offset,
sizeof (struct blkt_100_s),
blkt_type, 0);
if (!blkt_link)
break;
blkt_link->blktoffset = blkt_offset - 4;
blkt_link->next_blkt = next_blkt;
blkt_100 = (struct blkt_100_s *)blkt_link->blktdata;
if (headerswapflag)
{
ms_gswap4 (&blkt_100->samprate);
}
msr->samprate = msr->Blkt100->samprate;
}
else if (blkt_type == 200)
{ /* Found a Blockette 200 */
struct blkt_200_s *blkt_200;
blkt_link = msr_addblockette (msr, record + blkt_offset,
sizeof (struct blkt_200_s),
blkt_type, 0);
if (!blkt_link)
break;
blkt_link->blktoffset = blkt_offset - 4;
blkt_link->next_blkt = next_blkt;
blkt_200 = (struct blkt_200_s *)blkt_link->blktdata;
if (headerswapflag)
{
ms_gswap4 (&blkt_200->amplitude);
ms_gswap4 (&blkt_200->period);
ms_gswap4 (&blkt_200->background_estimate);
MS_SWAPBTIME (&blkt_200->time);
}
}
else if (blkt_type == 201)
{ /* Found a Blockette 201 */
struct blkt_201_s *blkt_201;
blkt_link = msr_addblockette (msr, record + blkt_offset,
sizeof (struct blkt_201_s),
blkt_type, 0);
if (!blkt_link)
break;
blkt_link->blktoffset = blkt_offset - 4;
blkt_link->next_blkt = next_blkt;
blkt_201 = (struct blkt_201_s *)blkt_link->blktdata;
if (headerswapflag)
{
ms_gswap4 (&blkt_201->amplitude);
ms_gswap4 (&blkt_201->period);
ms_gswap4 (&blkt_201->background_estimate);
MS_SWAPBTIME (&blkt_201->time);
}
}
else if (blkt_type == 300)
{ /* Found a Blockette 300 */
struct blkt_300_s *blkt_300;
blkt_link = msr_addblockette (msr, record + blkt_offset,
sizeof (struct blkt_300_s),
blkt_type, 0);
if (!blkt_link)
break;
blkt_link->blktoffset = blkt_offset - 4;
blkt_link->next_blkt = next_blkt;
blkt_300 = (struct blkt_300_s *)blkt_link->blktdata;
if (headerswapflag)
{
MS_SWAPBTIME (&blkt_300->time);
ms_gswap4 (&blkt_300->step_duration);
ms_gswap4 (&blkt_300->interval_duration);
ms_gswap4 (&blkt_300->amplitude);
ms_gswap4 (&blkt_300->reference_amplitude);
}
}
else if (blkt_type == 310)
{ /* Found a Blockette 310 */
struct blkt_310_s *blkt_310;
blkt_link = msr_addblockette (msr, record + blkt_offset,
sizeof (struct blkt_310_s),
blkt_type, 0);
if (!blkt_link)
break;
blkt_link->blktoffset = blkt_offset - 4;
blkt_link->next_blkt = next_blkt;
blkt_310 = (struct blkt_310_s *)blkt_link->blktdata;
if (headerswapflag)
{
MS_SWAPBTIME (&blkt_310->time);
ms_gswap4 (&blkt_310->duration);
ms_gswap4 (&blkt_310->period);
ms_gswap4 (&blkt_310->amplitude);
ms_gswap4 (&blkt_310->reference_amplitude);
}
}
else if (blkt_type == 320)
{ /* Found a Blockette 320 */
struct blkt_320_s *blkt_320;
blkt_link = msr_addblockette (msr, record + blkt_offset,
sizeof (struct blkt_320_s),
blkt_type, 0);
if (!blkt_link)
break;
blkt_link->blktoffset = blkt_offset - 4;
blkt_link->next_blkt = next_blkt;
blkt_320 = (struct blkt_320_s *)blkt_link->blktdata;
if (headerswapflag)
{
MS_SWAPBTIME (&blkt_320->time);
ms_gswap4 (&blkt_320->duration);
ms_gswap4 (&blkt_320->ptp_amplitude);
ms_gswap4 (&blkt_320->reference_amplitude);
}
}
else if (blkt_type == 390)
{ /* Found a Blockette 390 */
struct blkt_390_s *blkt_390;
blkt_link = msr_addblockette (msr, record + blkt_offset,
sizeof (struct blkt_390_s),
blkt_type, 0);
if (!blkt_link)
break;
blkt_link->blktoffset = blkt_offset - 4;
blkt_link->next_blkt = next_blkt;
blkt_390 = (struct blkt_390_s *)blkt_link->blktdata;
if (headerswapflag)
{
MS_SWAPBTIME (&blkt_390->time);
ms_gswap4 (&blkt_390->duration);
ms_gswap4 (&blkt_390->amplitude);
}
}
else if (blkt_type == 395)
{ /* Found a Blockette 395 */
struct blkt_395_s *blkt_395;
blkt_link = msr_addblockette (msr, record + blkt_offset,
sizeof (struct blkt_395_s),
blkt_type, 0);
if (!blkt_link)
break;
blkt_link->blktoffset = blkt_offset - 4;
blkt_link->next_blkt = next_blkt;
blkt_395 = (struct blkt_395_s *)blkt_link->blktdata;
if (headerswapflag)
{
MS_SWAPBTIME (&blkt_395->time);
}
}
else if (blkt_type == 400)
{ /* Found a Blockette 400 */
struct blkt_400_s *blkt_400;
blkt_link = msr_addblockette (msr, record + blkt_offset,
sizeof (struct blkt_400_s),
blkt_type, 0);
if (!blkt_link)
break;
blkt_link->blktoffset = blkt_offset - 4;
blkt_link->next_blkt = next_blkt;
blkt_400 = (struct blkt_400_s *)blkt_link->blktdata;
if (headerswapflag)
{
ms_gswap4 (&blkt_400->azimuth);
ms_gswap4 (&blkt_400->slowness);
ms_gswap2 (&blkt_400->configuration);
}
}
else if (blkt_type == 405)
{ /* Found a Blockette 405 */
struct blkt_405_s *blkt_405;
blkt_link = msr_addblockette (msr, record + blkt_offset,
sizeof (struct blkt_405_s),
blkt_type, 0);
if (!blkt_link)
break;
blkt_link->blktoffset = blkt_offset - 4;
blkt_link->next_blkt = next_blkt;
blkt_405 = (struct blkt_405_s *)blkt_link->blktdata;
if (headerswapflag)
{
ms_gswap2 (&blkt_405->delay_values);
}
if (verbose > 0)
{
ms_log (1, "msr_unpack(%s): WARNING Blockette 405 cannot be fully supported\n",
srcname);
}
}
else if (blkt_type == 500)
{ /* Found a Blockette 500 */
struct blkt_500_s *blkt_500;
blkt_link = msr_addblockette (msr, record + blkt_offset,
sizeof (struct blkt_500_s),
blkt_type, 0);
if (!blkt_link)
break;
blkt_link->blktoffset = blkt_offset - 4;
blkt_link->next_blkt = next_blkt;
blkt_500 = (struct blkt_500_s *)blkt_link->blktdata;
if (headerswapflag)
{
ms_gswap4 (&blkt_500->vco_correction);
MS_SWAPBTIME (&blkt_500->time);
ms_gswap4 (&blkt_500->exception_count);
}
}
else if (blkt_type == 1000)
{ /* Found a Blockette 1000 */
struct blkt_1000_s *blkt_1000;
blkt_link = msr_addblockette (msr, record + blkt_offset,
sizeof (struct blkt_1000_s),
blkt_type, 0);
if (!blkt_link)
break;
blkt_link->blktoffset = blkt_offset - 4;
blkt_link->next_blkt = next_blkt;
blkt_1000 = (struct blkt_1000_s *)blkt_link->blktdata;
/* Calculate record length in bytes as 2^(blkt_1000->reclen) */
msr->reclen = (uint32_t)1 << blkt_1000->reclen;
/* Compare against the specified length */
if (msr->reclen != reclen && verbose)
{
ms_log (2, "msr_unpack(%s): Record length in Blockette 1000 (%d) != specified length (%d)\n",
srcname, msr->reclen, reclen);
}
msr->encoding = blkt_1000->encoding;
msr->byteorder = blkt_1000->byteorder;
}
else if (blkt_type == 1001)
{ /* Found a Blockette 1001 */
blkt_link = msr_addblockette (msr, record + blkt_offset,
sizeof (struct blkt_1001_s),
blkt_type, 0);
if (!blkt_link)
break;
blkt_link->blktoffset = blkt_offset - 4;
blkt_link->next_blkt = next_blkt;
}
else if (blkt_type == 2000)
{ /* Found a Blockette 2000 */
struct blkt_2000_s *blkt_2000;
uint16_t b2klen;
/* Read the blockette length from blockette */
memcpy (&b2klen, record + blkt_offset, 2);
if (headerswapflag)
ms_gswap2 (&b2klen);
/* Minus four bytes for the blockette type and next fields */
b2klen -= 4;
blkt_link = msr_addblockette (msr, record + blkt_offset,
b2klen, blkt_type, 0);
if (!blkt_link)
break;
blkt_link->blktoffset = blkt_offset - 4;
blkt_link->next_blkt = next_blkt;
blkt_2000 = (struct blkt_2000_s *)blkt_link->blktdata;
if (headerswapflag)
{
ms_gswap2 (&blkt_2000->length);
ms_gswap2 (&blkt_2000->data_offset);
ms_gswap4 (&blkt_2000->recnum);
}
}
else
{ /* Unknown blockette type */
if (blkt_length >= 4)
{
blkt_link = msr_addblockette (msr, record + blkt_offset,
blkt_length - 4,
blkt_type, 0);
if (!blkt_link)
break;
blkt_link->blktoffset = blkt_offset - 4;
blkt_link->next_blkt = next_blkt;
}
}
/* Check that the next blockette offset is beyond the current blockette */
if (next_blkt && next_blkt < (blkt_offset + blkt_length - 4))
{
ms_log (2, "msr_unpack(%s): Offset to next blockette (%d) is within current blockette ending at byte %d\n",
srcname, next_blkt, (blkt_offset + blkt_length - 4));
blkt_offset = 0;
}
/* Check that the offset is within record length */
else if (next_blkt && next_blkt > reclen)
{
ms_log (2, "msr_unpack(%s): Offset to next blockette (%d) from type %d is beyond record length\n",
srcname, next_blkt, blkt_type);
blkt_offset = 0;
}
else
{
blkt_offset = next_blkt;
}
blkt_count++;
} /* End of while looping through blockettes */
/* Check for a Blockette 1000 */
if (msr->Blkt1000 == 0)
{
if (verbose > 1)
{
ms_log (1, "%s: Warning: No Blockette 1000 found\n", srcname);
}
}
/* Check that the data offset is after the blockette chain */
if (blkt_link && msr->fsdh->numsamples && msr->fsdh->data_offset < (blkt_link->blktoffset + blkt_link->blktdatalen + 4))
{
ms_log (1, "%s: Warning: Data offset in fixed header (%d) is within the blockette chain ending at %d\n",
srcname, msr->fsdh->data_offset, (blkt_link->blktoffset + blkt_link->blktdatalen + 4));
}
/* Check that the blockette count matches the number parsed */
if (msr->fsdh->numblockettes != blkt_count)
{
ms_log (1, "%s: Warning: Number of blockettes in fixed header (%d) does not match the number parsed (%d)\n",
srcname, msr->fsdh->numblockettes, blkt_count);
}
/* Populate remaining common header fields */
msr->starttime = msr_starttime (msr);
msr->samprate = msr_samprate (msr);
/* Set MSRecord->byteorder if data byte order is forced */
if (unpackdatabyteorder >= 0)
{
msr->byteorder = unpackdatabyteorder;
}
/* Check if encoding format is forced */
if (unpackencodingformat >= 0)
{
msr->encoding = unpackencodingformat;
}
/* Use encoding format fallback if defined and no encoding is set,
also make sure the byteorder is set by default to big endian */
if (unpackencodingfallback >= 0 && msr->encoding == -1)
{
msr->encoding = unpackencodingfallback;
if (msr->byteorder == -1)
{
msr->byteorder = 1;
}
}
/* Unpack the data samples if requested */
if (dataflag && msr->samplecnt > 0)
{
flag dswapflag = headerswapflag;
flag bigendianhost = ms_bigendianhost ();
/* Determine byte order of the data and set the dswapflag as
needed; if no Blkt1000 or UNPACK_DATA_BYTEORDER environment
variable setting assume the order is the same as the header */
if (msr->Blkt1000 != 0 && unpackdatabyteorder < 0)
{
dswapflag = 0;
/* If BE host and LE data need swapping */
if (bigendianhost && msr->byteorder == 0)
dswapflag = 1;
/* If LE host and BE data (or bad byte order value) need swapping */
else if (!bigendianhost && msr->byteorder > 0)
dswapflag = 1;
}
else if (unpackdatabyteorder >= 0)
{
dswapflag = dataswapflag;
}
if (verbose > 2 && dswapflag)
ms_log (1, "%s: Byte swapping needed for unpacking of data samples\n", srcname);
else if (verbose > 2)
ms_log (1, "%s: Byte swapping NOT needed for unpacking of data samples\n", srcname);
retval = msr_unpack_data (msr, dswapflag, verbose);
if (retval < 0)
return retval;
else
msr->numsamples = retval;
}
else
{
if (msr->datasamples)
free (msr->datasamples);
msr->datasamples = 0;
msr->numsamples = 0;
}
return MS_NOERROR;
} /* End of msr_unpack() */
/************************************************************************
* msr_unpack_data:
*
* Unpack Mini-SEED data samples for a given MSRecord. The packed
* data is accessed in the record indicated by MSRecord->record and
* the unpacked samples are placed in MSRecord->datasamples. The
* resulting data samples are either 32-bit integers, 32-bit floats
* or 64-bit floats in host byte order.
*
* Return number of samples unpacked or negative libmseed error code.
************************************************************************/
int
msr_unpack_data (MSRecord *msr, int swapflag, flag verbose)
{
int datasize; /* byte size of data samples in record */
int nsamples; /* number of samples unpacked */
int unpacksize; /* byte size of unpacked samples */
int samplesize = 0; /* size of the data samples in bytes */
char srcname[50];
const char *dbuf;
if (!msr)
return MS_GENERROR;
/* Check for decode debugging environment variable */
if (getenv ("DECODE_DEBUG"))
decodedebug = 1;
/* Generate source name for MSRecord */
if (msr_srcname (msr, srcname, 1) == NULL)
{
ms_log (2, "msr_unpack(): Cannot generate srcname\n");
return MS_GENERROR;
}
/* Sanity record length */
if (msr->reclen == -1)
{
ms_log (2, "msr_unpack_data(%s): Record size unknown\n", srcname);
return MS_NOTSEED;
}
else if (msr->reclen < MINRECLEN || msr->reclen > MAXRECLEN)
{
ms_log (2, "msr_unpack_data(%s): Unsupported record length: %d\n",
srcname, msr->reclen);
return MS_OUTOFRANGE;
}
/* Sanity check data offset before creating a pointer based on the value */
if (msr->fsdh->data_offset < 48 || msr->fsdh->data_offset >= msr->reclen)
{
ms_log (2, "msr_unpack_data(%s): data offset value is not valid: %d\n",
srcname, msr->fsdh->data_offset);
return MS_GENERROR;
}
datasize = msr->reclen - msr->fsdh->data_offset;
dbuf = msr->record + msr->fsdh->data_offset;
switch (msr->encoding)
{
case DE_ASCII:
samplesize = 1;
break;
case DE_INT16:
case DE_INT32:
case DE_FLOAT32:
case DE_STEIM1:
case DE_STEIM2:
case DE_GEOSCOPE24:
case DE_GEOSCOPE163:
case DE_GEOSCOPE164:
case DE_CDSN:
case DE_SRO:
case DE_DWWSSN:
samplesize = 4;
break;
case DE_FLOAT64:
samplesize = 8;
break;
default:
samplesize = 0;
break;
}
/* Calculate buffer size needed for unpacked samples */
unpacksize = (int)msr->samplecnt * samplesize;
/* (Re)Allocate space for the unpacked data */
if (unpacksize > 0)
{
msr->datasamples = realloc (msr->datasamples, unpacksize);
if (msr->datasamples == NULL)
{
ms_log (2, "msr_unpack_data(%s): Cannot (re)allocate memory\n", srcname);
return MS_GENERROR;
}
}
else
{
if (msr->datasamples)
free (msr->datasamples);
msr->datasamples = 0;
msr->numsamples = 0;
}
if (verbose > 2)
ms_log (1, "%s: Unpacking %" PRId64 " samples\n", srcname, msr->samplecnt);
/* Decode data samples according to encoding */
switch (msr->encoding)
{
case DE_ASCII:
if (verbose > 1)
ms_log (1, "%s: Found ASCII data\n", srcname);
nsamples = (int)msr->samplecnt;
memcpy (msr->datasamples, dbuf, nsamples);
msr->sampletype = 'a';
break;
case DE_INT16:
if (verbose > 1)
ms_log (1, "%s: Unpacking INT16 data samples\n", srcname);
nsamples = msr_decode_int16 ((int16_t *)dbuf, (int)msr->samplecnt,
msr->datasamples, unpacksize, swapflag);
msr->sampletype = 'i';
break;
case DE_INT32:
if (verbose > 1)
ms_log (1, "%s: Unpacking INT32 data samples\n", srcname);
nsamples = msr_decode_int32 ((int32_t *)dbuf, (int)msr->samplecnt,
msr->datasamples, unpacksize, swapflag);
msr->sampletype = 'i';
break;
case DE_FLOAT32:
if (verbose > 1)
ms_log (1, "%s: Unpacking FLOAT32 data samples\n", srcname);
nsamples = msr_decode_float32 ((float *)dbuf, (int)msr->samplecnt,
msr->datasamples, unpacksize, swapflag);
msr->sampletype = 'f';
break;
case DE_FLOAT64:
if (verbose > 1)
ms_log (1, "%s: Unpacking FLOAT64 data samples\n", srcname);
nsamples = msr_decode_float64 ((double *)dbuf, (int)msr->samplecnt,
msr->datasamples, unpacksize, swapflag);
msr->sampletype = 'd';
break;
case DE_STEIM1:
if (verbose > 1)
ms_log (1, "%s: Unpacking Steim1 data frames\n", srcname);
nsamples = msr_decode_steim1 ((int32_t *)dbuf, datasize, (int)msr->samplecnt,
msr->datasamples, unpacksize, srcname, swapflag);
if (nsamples < 0)
return MS_GENERROR;
msr->sampletype = 'i';
break;
case DE_STEIM2:
if (verbose > 1)
ms_log (1, "%s: Unpacking Steim2 data frames\n", srcname);
nsamples = msr_decode_steim2 ((int32_t *)dbuf, datasize, (int)msr->samplecnt,
msr->datasamples, unpacksize, srcname, swapflag);
if (nsamples < 0)
return MS_GENERROR;
msr->sampletype = 'i';
break;
case DE_GEOSCOPE24:
case DE_GEOSCOPE163:
case DE_GEOSCOPE164:
if (verbose > 1)
{
if (msr->encoding == DE_GEOSCOPE24)
ms_log (1, "%s: Unpacking GEOSCOPE 24bit integer data samples\n",
srcname);
if (msr->encoding == DE_GEOSCOPE163)
ms_log (1, "%s: Unpacking GEOSCOPE 16bit gain ranged/3bit exponent data samples\n",
srcname);
if (msr->encoding == DE_GEOSCOPE164)
ms_log (1, "%s: Unpacking GEOSCOPE 16bit gain ranged/4bit exponent data samples\n",
srcname);
}
nsamples = msr_decode_geoscope ((char *)dbuf, (int)msr->samplecnt, msr->datasamples,
unpacksize, msr->encoding, srcname, swapflag);
msr->sampletype = 'f';
break;
case DE_CDSN:
if (verbose > 1)
ms_log (1, "%s: Unpacking CDSN encoded data samples\n", srcname);
nsamples = msr_decode_cdsn ((int16_t *)dbuf, (int)msr->samplecnt, msr->datasamples,
unpacksize, swapflag);
msr->sampletype = 'i';
break;
case DE_SRO:
if (verbose > 1)
ms_log (1, "%s: Unpacking SRO encoded data samples\n", srcname);
nsamples = msr_decode_sro ((int16_t *)dbuf, (int)msr->samplecnt, msr->datasamples,
unpacksize, srcname, swapflag);
msr->sampletype = 'i';
break;
case DE_DWWSSN:
if (verbose > 1)
ms_log (1, "%s: Unpacking DWWSSN encoded data samples\n", srcname);
nsamples = msr_decode_dwwssn ((int16_t *)dbuf, (int)msr->samplecnt, msr->datasamples,
unpacksize, swapflag);
msr->sampletype = 'i';
break;
default:
ms_log (2, "%s: Unsupported encoding format %d (%s)\n",
srcname, msr->encoding, (char *)ms_encodingstr (msr->encoding));
return MS_UNKNOWNFORMAT;
}
if (nsamples != msr->samplecnt)
{
ms_log (2, "msr_unpack_data(%s): only decoded %d samples of %d expected\n",
srcname, nsamples, msr->samplecnt);
return MS_GENERROR;
}
return nsamples;
} /* End of msr_unpack_data() */
/************************************************************************
* check_environment:
*
* Check environment variables and set global variables appropriately.
*
* Return 0 on success and -1 on error.
************************************************************************/
static int
check_environment (int verbose)
{
char *envvariable;
/* Read possible environmental variables that force byteorder */
if (unpackheaderbyteorder == -2)
{
if ((envvariable = getenv ("UNPACK_HEADER_BYTEORDER")))
{
if (*envvariable != '0' && *envvariable != '1')
{
ms_log (2, "Environment variable UNPACK_HEADER_BYTEORDER must be set to '0' or '1'\n");
return -1;
}
else if (*envvariable == '0')
{
unpackheaderbyteorder = 0;
if (verbose > 2)
ms_log (1, "UNPACK_HEADER_BYTEORDER=0, unpacking little-endian header\n");
}
else
{
unpackheaderbyteorder = 1;
if (verbose > 2)
ms_log (1, "UNPACK_HEADER_BYTEORDER=1, unpacking big-endian header\n");
}
}