aboutsummaryrefslogtreecommitdiffstats
path: root/file.c
blob: 9b3db605baa6c17fc9374fb9c425e053d0aa2957 (plain)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
/* file.c
 * File I/O routines
 *
 * $Id: file.c,v 1.286 2002/08/28 10:07:26 guy Exp $
 *
 * Ethereal - Network traffic analyzer
 * By Gerald Combs <gerald@ethereal.com>
 * Copyright 1998 Gerald Combs
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <gtk/gtk.h>

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include <time.h>

#ifdef HAVE_IO_H
#include <io.h>
#endif

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <signal.h>

#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif

#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif

#ifdef NEED_SNPRINTF_H
# include "snprintf.h"
#endif

#ifdef NEED_STRERROR_H
#include "strerror.h"
#endif

#include <epan/epan.h>
#include <epan/filesystem.h>

#include "gtk/main.h"
#include "color.h"
#include "gtk/color_utils.h"
#include "column.h"
#include <epan/packet.h>
#include "print.h"
#include "file.h"
#include "menu.h"
#include "util.h"
#include "simple_dialog.h"
#include "progress_dlg.h"
#include "ui_util.h"
#include "statusbar.h"
#include "prefs.h"
#include "gtk/proto_draw.h"
#include "gtk/packet_win.h"
#include <epan/dfilter/dfilter.h>
#include <epan/conversation.h>
#include "globals.h"
#include "gtk/colors.h"
#include <epan/epan_dissect.h>

extern GtkWidget *packet_list, *byte_nb_ptr, *tree_view;

#ifdef HAVE_LIBPCAP
gboolean auto_scroll_live;
#endif

static guint32 firstsec, firstusec;
static guint32 prevsec, prevusec;

static void read_packet(capture_file *cf, long offset);

static void rescan_packets(capture_file *cf, const char *action, const char *action_item,
	gboolean refilter, gboolean redissect);

static void set_selected_row(int row);

static void freeze_clist(capture_file *cf);
static void thaw_clist(capture_file *cf);

static char *file_rename_error_message(int err);
static char *file_close_error_message(int err);
static gboolean copy_binary_file(char *from_filename, char *to_filename);

/* Update the progress bar this many times when reading a file. */
#define N_PROGBAR_UPDATES	100

/* Number of "frame_data" structures per memory chunk.
   XXX - is this the right number? */
#define	FRAME_DATA_CHUNK_SIZE	1024

int
open_cap_file(char *fname, gboolean is_tempfile, capture_file *cf)
{
  wtap       *wth;
  int         err;
  int         fd;
  struct stat cf_stat;

  wth = wtap_open_offline(fname, &err, TRUE);
  if (wth == NULL)
    goto fail;

  /* Find the size of the file. */
  fd = wtap_fd(wth);
  if (fstat(fd, &cf_stat) < 0) {
    err = errno;
    wtap_close(wth);
    goto fail;
  }

  /* The open succeeded.  Close whatever capture file we had open,
     and fill in the information for this file. */
  close_cap_file(cf);

  /* Initialize all data structures used for dissection. */
  init_dissection();

  /* We're about to start reading the file. */
  cf->state = FILE_READ_IN_PROGRESS;

  cf->wth = wth;
  cf->filed = fd;
  cf->f_len = cf_stat.st_size;

  /* Set the file name because we need it to set the follow stream filter.
     XXX - is that still true?  We need it for other reasons, though,
     in any case. */
  cf->filename = g_strdup(fname);

  /* Indicate whether it's a permanent or temporary file. */
  cf->is_tempfile = is_tempfile;

  /* If it's a temporary capture buffer file, mark it as not saved. */
  cf->user_saved = !is_tempfile;

  cf->cd_t      = wtap_file_type(cf->wth);
  cf->count     = 0;
  cf->marked_count = 0;
  cf->drops_known = FALSE;
  cf->drops     = 0;
  cf->esec      = 0;
  cf->eusec     = 0;
  cf->snap      = wtap_snapshot_length(cf->wth);
  if (cf->snap == 0) {
    /* Snapshot length not known. */
    cf->has_snap = FALSE;
    cf->snap = WTAP_MAX_PACKET_SIZE;
  } else
    cf->has_snap = TRUE;
  cf->progbar_quantum = 0;
  cf->progbar_nextstep = 0;
  firstsec = 0, firstusec = 0;
  prevsec = 0, prevusec = 0;
 
  cf->plist_chunk = g_mem_chunk_new("frame_data_chunk",
	sizeof(frame_data),
	FRAME_DATA_CHUNK_SIZE * sizeof(frame_data),
	G_ALLOC_AND_FREE);
  g_assert(cf->plist_chunk);

  return (0);

fail:
  simple_dialog(ESD_TYPE_CRIT, NULL,
			file_open_error_message(err, FALSE, 0), fname);
  return (err);
}

/* Reset everything to a pristine state */
void
close_cap_file(capture_file *cf)
{
  /* Die if we're in the middle of reading a file. */
  g_assert(cf->state != FILE_READ_IN_PROGRESS);

  /* Destroy all popup packet windows, as they refer to packets in the
     capture file we're closing. */
  destroy_packet_wins();

  if (cf->wth) {
    wtap_close(cf->wth);
    cf->wth = NULL;
  }
  /* We have no file open... */
  if (cf->filename != NULL) {
    /* If it's a temporary file, remove it. */
    if (cf->is_tempfile)
      unlink(cf->filename);
    g_free(cf->filename);
    cf->filename = NULL;
  }
  /* ...which means we have nothing to save. */
  cf->user_saved = FALSE;

  if (cf->plist_chunk != NULL) {
    g_mem_chunk_destroy(cf->plist_chunk);
    cf->plist_chunk = NULL;
  }
  if (cf->rfcode != NULL) {
    dfilter_free(cf->rfcode);
    cf->rfcode = NULL;
  }
  cf->plist = NULL;
  cf->plist_end = NULL;
  unselect_packet(cf);	/* nothing to select */
  cf->first_displayed = NULL;
  cf->last_displayed = NULL;

  /* Clear the packet list. */
  gtk_clist_freeze(GTK_CLIST(packet_list));
  gtk_clist_clear(GTK_CLIST(packet_list));
  gtk_clist_thaw(GTK_CLIST(packet_list));

  /* Clear any file-related status bar messages.
     XXX - should be "clear *ALL* file-related status bar messages;
     will there ever be more than one on the stack? */
  statusbar_pop_file_msg();

  /* Restore the standard title bar message. */
  set_main_window_name("The Ethereal Network Analyzer");

  /* Disable all menu items that make sense only if you have a capture. */
  set_menus_for_capture_file(FALSE);
  set_menus_for_unsaved_capture_file(FALSE);
  set_menus_for_captured_packets(FALSE);
  set_menus_for_selected_packet(FALSE);
  set_menus_for_capture_in_progress(FALSE);
  set_menus_for_selected_tree_row(FALSE);

  /* We have no file open. */
  cf->state = FILE_CLOSED;
}

/* Set the file name in the status line, in the name for the main window,
   and in the name for the main window's icon. */
static void
set_display_filename(capture_file *cf)
{
  gchar  *name_ptr;
  size_t  msg_len;
  static const gchar done_fmt_nodrops[] = " File: %s";
  static const gchar done_fmt_drops[] = " File: %s  Drops: %u";
  gchar  *done_msg;
  gchar  *win_name_fmt = "%s - Ethereal";
  gchar  *win_name;

  if (!cf->is_tempfile) {
    /* Get the last component of the file name, and put that in the
       status bar. */
    name_ptr = get_basename(cf->filename);
  } else {
    /* The file we read is a temporary file from a live capture;
       we don't mention its name in the status bar. */
    name_ptr = "<capture>";
  }

  if (cf->drops_known) {
    msg_len = strlen(name_ptr) + strlen(done_fmt_drops) + 64;
    done_msg = g_malloc(msg_len);
    snprintf(done_msg, msg_len, done_fmt_drops, name_ptr, cf->drops);
  } else {
    msg_len = strlen(name_ptr) + strlen(done_fmt_nodrops);
    done_msg = g_malloc(msg_len);
    snprintf(done_msg, msg_len, done_fmt_nodrops, name_ptr);
  }
  statusbar_push_file_msg(done_msg);
  g_free(done_msg);

  msg_len = strlen(name_ptr) + strlen(win_name_fmt) + 1;
  win_name = g_malloc(msg_len);
  snprintf(win_name, msg_len, win_name_fmt, name_ptr);
  set_main_window_name(win_name);
  g_free(win_name);
}

read_status_t
read_cap_file(capture_file *cf, int *err)
{
  gchar      *name_ptr, *load_msg, *load_fmt = "%s";
  size_t      msg_len;
  char       *errmsg;
  char        errmsg_errno[1024+1];
  gchar       err_str[2048+1];
  long        data_offset;
  progdlg_t  *progbar = NULL;
  gboolean    stop_flag;
  /*
   * XXX - should be "off_t", but Wiretap would need more work to handle
   * the full size of "off_t" on platforms where it's more than a "long"
   * as well.
   */
  long        file_pos;
  float       prog_val;
  int         fd;
  struct stat cf_stat;
  GTimeVal    start_time;
  gchar       status_str[100];

  name_ptr = get_basename(cf->filename);

  msg_len = strlen(name_ptr) + strlen(load_fmt) + 2;
  load_msg = g_malloc(msg_len);
  snprintf(load_msg, msg_len, load_fmt, name_ptr);
  statusbar_push_file_msg(load_msg);

  /* Update the progress bar when it gets to this value. */
  cf->progbar_nextstep = 0;
  /* When we reach the value that triggers a progress bar update,
     bump that value by this amount. */
  cf->progbar_quantum = cf->f_len/N_PROGBAR_UPDATES;

#ifndef O_BINARY
#define O_BINARY 	0
#endif

  freeze_clist(cf);

  stop_flag = FALSE;
  g_get_current_time(&start_time);

  while ((wtap_read(cf->wth, err, &data_offset))) {
    /* Update the progress bar, but do it only N_PROGBAR_UPDATES times;
       when we update it, we have to run the GTK+ main loop to get it
       to repaint what's pending, and doing so may involve an "ioctl()"
       to see if there's any pending input from an X server, and doing
       that for every packet can be costly, especially on a big file. */
    if (data_offset >= cf->progbar_nextstep) {
        file_pos = lseek(cf->filed, 0, SEEK_CUR);
        prog_val = (gfloat) file_pos / (gfloat) cf->f_len;
        if (prog_val > 1.0) {
          /* The file probably grew while we were reading it.
             Update "cf->f_len", and try again. */
          fd = wtap_fd(cf->wth);
          if (fstat(fd, &cf_stat) >= 0) {
            cf->f_len = cf_stat.st_size;
            prog_val = (gfloat) file_pos / (gfloat) cf->f_len;
          }
          /* If it's still > 1, either the "fstat()" failed (in which
             case there's not much we can do about it), or the file
             *shrank* (in which case there's not much we can do about
             it); just clip the progress value at 1.0. */
          if (prog_val > 1.0)
            prog_val = 1.0;
        }
        if (progbar == NULL) {
          /* Create the progress bar if necessary */
          progbar = delayed_create_progress_dlg("Loading", load_msg, "Stop",
            &stop_flag, &start_time, prog_val);
          if (progbar != NULL)
            g_free(load_msg);
        }
        if (progbar != NULL) {
          g_snprintf(status_str, sizeof(status_str), 
                     "%luKB of %luKB", file_pos / 1024, cf->f_len / 1024);
          update_progress_dlg(progbar, prog_val, status_str);
        }
        cf->progbar_nextstep += cf->progbar_quantum;
    }

    if (stop_flag) {
      /* Well, the user decided to abort the read.  Destroy the progress
         bar, close the capture file, and return READ_ABORTED so our caller
	 can do whatever is appropriate when that happens. */
      destroy_progress_dlg(progbar);
      cf->state = FILE_READ_ABORTED;	/* so that we're allowed to close it */
      gtk_clist_thaw(GTK_CLIST(packet_list));	/* undo our freeze */
      close_cap_file(cf);
      return (READ_ABORTED);
    }
    read_packet(cf, data_offset);
  }

  /* We're done reading the file; destroy the progress bar if it was created. */
  if (progbar == NULL)
    g_free(load_msg);
  else
    destroy_progress_dlg(progbar);

  /* We're done reading sequentially through the file. */
  cf->state = FILE_READ_DONE;

  /* Close the sequential I/O side, to free up memory it requires. */
  wtap_sequential_close(cf->wth);

  /* Allow the protocol dissectors to free up memory that they
   * don't need after the sequential run-through of the packets. */
  postseq_cleanup_all_protocols();

  /* Set the file encapsulation type now; we don't know what it is until
     we've looked at all the packets, as we don't know until then whether
     there's more than one type (and thus whether it's
     WTAP_ENCAP_PER_PACKET). */
  cf->lnk_t = wtap_file_encap(cf->wth);

  cf->current_frame = cf->first_displayed;
  thaw_clist(cf);

  statusbar_pop_file_msg();
  set_display_filename(cf);

  /* Enable menu items that make sense if you have a capture file you've
     finished reading. */
  set_menus_for_capture_file(TRUE);
  set_menus_for_unsaved_capture_file(!cf->user_saved);

  /* Enable menu items that make sense if you have some captured packets. */
  set_menus_for_captured_packets(TRUE);

  /* If we have any displayed packets to select, select the first of those
     packets by making the first row the selected row. */
  if (cf->first_displayed != NULL)
    gtk_signal_emit_by_name(GTK_OBJECT(packet_list), "select_row", 0);

  if (*err != 0) {
    /* Put up a message box noting that the read failed somewhere along
       the line.  Don't throw out the stuff we managed to read, though,
       if any. */
    switch (*err) {

    case WTAP_ERR_UNSUPPORTED_ENCAP:
      errmsg = "The capture file is for a network type that Ethereal doesn't support.";
      break;

    case WTAP_ERR_CANT_READ:
      errmsg = "An attempt to read from the file failed for"
               " some unknown reason.";
      break;

    case WTAP_ERR_SHORT_READ:
      errmsg = "The capture file appears to have been cut short"
               " in the middle of a packet.";
      break;

    case WTAP_ERR_BAD_RECORD:
      errmsg = "The capture file appears to be damaged or corrupt.";
      break;

    default:
      snprintf(errmsg_errno, sizeof(errmsg_errno),
	       "An error occurred while reading the"
	       " capture file: %s.", wtap_strerror(*err));
      errmsg = errmsg_errno;
      break;
    }
    snprintf(err_str, sizeof err_str, errmsg);
    simple_dialog(ESD_TYPE_CRIT, NULL, err_str);
    return (READ_ERROR);
  } else
    return (READ_SUCCESS);
}

#ifdef HAVE_LIBPCAP
int
start_tail_cap_file(char *fname, gboolean is_tempfile, capture_file *cf)
{
  int     err;
  int     i;

  err = open_cap_file(fname, is_tempfile, cf);
  if (err == 0) {
    /* Disable menu items that make no sense if you're currently running
       a capture. */
    set_menus_for_capture_in_progress(TRUE);

    /* Enable menu items that make sense if you have some captured
       packets (yes, I know, we don't have any *yet*). */
    set_menus_for_captured_packets(TRUE);

    for (i = 0; i < cf->cinfo.num_cols; i++) {
      if (get_column_resize_type(cf->cinfo.col_fmt[i]) == RESIZE_LIVE)
        gtk_clist_set_column_auto_resize(GTK_CLIST(packet_list), i, TRUE);
      else {
        gtk_clist_set_column_auto_resize(GTK_CLIST(packet_list), i, FALSE);
        gtk_clist_set_column_width(GTK_CLIST(packet_list), i,
				cf->cinfo.col_width[i]);
        gtk_clist_set_column_resizeable(GTK_CLIST(packet_list), i, TRUE);
      }
    }

    statusbar_push_file_msg(" <live capture in progress>");
  }
  return err;
}

read_status_t
continue_tail_cap_file(capture_file *cf, int to_read, int *err)
{
  long data_offset = 0;

  gtk_clist_freeze(GTK_CLIST(packet_list));

  while (to_read != 0 && (wtap_read(cf->wth, err, &data_offset))) {
    if (cf->state == FILE_READ_ABORTED) {
      /* Well, the user decided to exit Ethereal.  Break out of the
         loop, and let the code below (which is called even if there
	 aren't any packets left to read) exit. */
      break;
    }
    read_packet(cf, data_offset);
    to_read--;
  }

  gtk_clist_thaw(GTK_CLIST(packet_list));

  /* XXX - this cheats and looks inside the packet list to find the final
     row number. */
  if (auto_scroll_live && cf->plist_end != NULL)
    gtk_clist_moveto(GTK_CLIST(packet_list), 
		       GTK_CLIST(packet_list)->rows - 1, -1, 1.0, 1.0);

  if (cf->state == FILE_READ_ABORTED) {
    /* Well, the user decided to exit Ethereal.  Return READ_ABORTED
       so that our caller can kill off the capture child process;
       this will cause an EOF on the pipe from the child, so
       "finish_tail_cap_file()" will be called, and it will clean up
       and exit. */
    return READ_ABORTED;
  } else if (*err != 0) {
    /* We got an error reading the capture file.
       XXX - pop up a dialog box? */
    return (READ_ERROR);
  } else
    return (READ_SUCCESS);
}

read_status_t
finish_tail_cap_file(capture_file *cf, int *err)
{
  long data_offset;

  gtk_clist_freeze(GTK_CLIST(packet_list));

  while ((wtap_read(cf->wth, err, &data_offset))) {
    if (cf->state == FILE_READ_ABORTED) {
      /* Well, the user decided to abort the read.  Break out of the
         loop, and let the code below (which is called even if there
	 aren't any packets left to read) exit. */
      break;
    }
    read_packet(cf, data_offset);
  }

  if (cf->state == FILE_READ_ABORTED) {
    /* Well, the user decided to abort the read.  We're only called
       when the child capture process closes the pipe to us (meaning
       it's probably exited), so we can just close the capture
       file; we return READ_ABORTED so our caller can do whatever
       is appropriate when that happens. */
    close_cap_file(cf);
    return READ_ABORTED;
  }

  thaw_clist(cf);
  if (auto_scroll_live && cf->plist_end != NULL)
    /* XXX - this cheats and looks inside the packet list to find the final
       row number. */
    gtk_clist_moveto(GTK_CLIST(packet_list), 
		       GTK_CLIST(packet_list)->rows - 1, -1, 1.0, 1.0);

  /* We're done reading sequentially through the file. */
  cf->state = FILE_READ_DONE;

  /* We're done reading sequentially through the file; close the
     sequential I/O side, to free up memory it requires. */
  wtap_sequential_close(cf->wth);

  /* Allow the protocol dissectors to free up memory that they
   * don't need after the sequential run-through of the packets. */
  postseq_cleanup_all_protocols();

  /* Set the file encapsulation type now; we don't know what it is until
     we've looked at all the packets, as we don't know until then whether
     there's more than one type (and thus whether it's
     WTAP_ENCAP_PER_PACKET). */
  cf->lnk_t = wtap_file_encap(cf->wth);

  /* Pop the "<live capture in progress>" message off the status bar. */
  statusbar_pop_file_msg();

  set_display_filename(cf);

  /* Enable menu items that make sense if you're not currently running
     a capture. */
  set_menus_for_capture_in_progress(FALSE);

  /* Enable menu items that make sense if you have a capture file
     you've finished reading. */
  set_menus_for_capture_file(TRUE);
  set_menus_for_unsaved_capture_file(!cf->user_saved);

  if (*err != 0) {
    /* We got an error reading the capture file.
       XXX - pop up a dialog box? */
    return (READ_ERROR);
  } else
    return (READ_SUCCESS);
}
#endif /* HAVE_LIBPCAP */

typedef struct {
  color_filter_t *colorf;
  epan_dissect_t *edt;
} apply_color_filter_args;

/*
 * If no color filter has been applied, apply this one.
 * (The "if no color filter has been applied" is to handle the case where
 * more than one color filter matches the packet.)
 */
static void
apply_color_filter(gpointer filter_arg, gpointer argp)
{
  color_filter_t *colorf = filter_arg;
  apply_color_filter_args *args = argp;

  if (colorf->c_colorfilter != NULL && args->colorf == NULL) {
    if (dfilter_apply_edt(colorf->c_colorfilter, args->edt))
      args->colorf = colorf;
  }
}

static int
add_packet_to_packet_list(frame_data *fdata, capture_file *cf,
	union wtap_pseudo_header *pseudo_header, const guchar *buf,
	gboolean refilter)
{
  apply_color_filter_args args;
  gint          row;
  gboolean	create_proto_tree = FALSE;
  epan_dissect_t *edt;
  GdkColor      fg, bg;

  /* We don't yet have a color filter to apply. */
  args.colorf = NULL;

  /* If we don't have the time stamp of the first packet in the
     capture, it's because this is the first packet.  Save the time
     stamp of this packet as the time stamp of the first packet. */
  if (!firstsec && !firstusec) {
    firstsec  = fdata->abs_secs;
    firstusec = fdata->abs_usecs;
  }

  /* If either

	we have a display filter and are re-applying it;

	we have a list of color filters;

     allocate a protocol tree root node, so that we'll construct
     a protocol tree against which a filter expression can be
     evaluated. */
  if ((cf->dfcode != NULL && refilter) || filter_list != NULL)
	  create_proto_tree = TRUE;

  /* Dissect the frame. */
  edt = epan_dissect_new(create_proto_tree, FALSE);

  if (cf->dfcode != NULL && refilter) {
      epan_dissect_prime_dfilter(edt, cf->dfcode);
  }
  if (filter_list) {
      filter_list_prime_edt(edt);
  }
  epan_dissect_run(edt, pseudo_header, buf, fdata, &cf->cinfo);


  /* If we have a display filter, apply it if we're refiltering, otherwise
     leave the "passed_dfilter" flag alone.

     If we don't have a display filter, set "passed_dfilter" to 1. */
  if (cf->dfcode != NULL) {
    if (refilter) {
      if (cf->dfcode != NULL)
        fdata->flags.passed_dfilter = dfilter_apply_edt(cf->dfcode, edt) ? 1 : 0;
      else
        fdata->flags.passed_dfilter = 1;
    }
  } else
    fdata->flags.passed_dfilter = 1;

  /* If we have color filters, and the frame is to be displayed, apply
     the color filters. */
  if (fdata->flags.passed_dfilter) {
    if (filter_list != NULL) {
      args.edt = edt;
      g_slist_foreach(filter_list, apply_color_filter, &args);
    }
  }


  if (fdata->flags.passed_dfilter) {
    /* This frame passed the display filter, so add it to the clist. */

    /* If we don't have the time stamp of the previous displayed packet,
       it's because this is the first displayed packet.  Save the time
       stamp of this packet as the time stamp of the previous displayed
       packet. */
    if (!prevsec && !prevusec) {
      prevsec  = fdata->abs_secs;
      prevusec = fdata->abs_usecs;
    }

    /* Get the time elapsed between the first packet and this packet. */
    compute_timestamp_diff(&fdata->rel_secs, &fdata->rel_usecs,
		fdata->abs_secs, fdata->abs_usecs, firstsec, firstusec);

    /* If it's greater than the current elapsed time, set the elapsed time
       to it (we check for "greater than" so as not to be confused by
       time moving backwards). */
    if ((gint32)cf->esec < fdata->rel_secs
	|| ((gint32)cf->esec == fdata->rel_secs && (gint32)cf->eusec < fdata->rel_usecs)) {
      cf->esec = fdata->rel_secs;
      cf->eusec = fdata->rel_usecs;
    }
  
    /* Get the time elapsed between the previous displayed packet and
       this packet. */
    compute_timestamp_diff(&fdata->del_secs, &fdata->del_usecs,
		fdata->abs_secs, fdata->abs_usecs, prevsec, prevusec);
    prevsec = fdata->abs_secs;
    prevusec = fdata->abs_usecs;

    epan_dissect_fill_in_columns(edt);

    /* If we haven't yet seen the first frame, this is it.

       XXX - we must do this before we add the row to the display,
       as, if the display's GtkCList's selection mode is
       GTK_SELECTION_BROWSE, when the first entry is added to it,
       "select_packet()" will be called, and it will fetch the row
       data for the 0th row, and will get a null pointer rather than
       "fdata", as "gtk_clist_append()" won't yet have returned and
       thus "gtk_clist_set_row_data()" won't yet have been called.

       We thus need to leave behind bread crumbs so that
       "select_packet()" can find this frame.  See the comment
       in "select_packet()". */
    if (cf->first_displayed == NULL)
      cf->first_displayed = fdata;

    /* This is the last frame we've seen so far. */
    cf->last_displayed = fdata;

    row = gtk_clist_append(GTK_CLIST(packet_list), cf->cinfo.col_data);
    gtk_clist_set_row_data(GTK_CLIST(packet_list), row, fdata);

    if (fdata->flags.marked) {
	color_t_to_gdkcolor(&bg, &prefs.gui_marked_bg);
	color_t_to_gdkcolor(&fg, &prefs.gui_marked_fg);
    } else if (filter_list != NULL && (args.colorf != NULL)) {
	bg = args.colorf->bg_color;
	fg = args.colorf->fg_color;
    } else {
	bg = WHITE;
	fg = BLACK;
    }
    gtk_clist_set_background(GTK_CLIST(packet_list), row, &bg);
    gtk_clist_set_foreground(GTK_CLIST(packet_list), row, &fg);
  } else {
    /* This frame didn't pass the display filter, so it's not being added
       to the clist, and thus has no row. */
    row = -1;
  }
  epan_dissect_free(edt);
  return row;
}

static void
read_packet(capture_file *cf, long offset)
{
  const struct wtap_pkthdr *phdr = wtap_phdr(cf->wth);
  union wtap_pseudo_header *pseudo_header = wtap_pseudoheader(cf->wth);
  const guchar *buf = wtap_buf_ptr(cf->wth);
  frame_data   *fdata;
  int           passed;
  frame_data   *plist_end;
  epan_dissect_t *edt;

  /* Allocate the next list entry, and add it to the list. */
  fdata = g_mem_chunk_alloc(cf->plist_chunk);

  fdata->next = NULL;
  fdata->prev = NULL;
  fdata->pfd  = NULL;
  fdata->pkt_len  = phdr->len;
  fdata->cap_len  = phdr->caplen;
  fdata->file_off = offset;
  fdata->lnk_t = phdr->pkt_encap;
  fdata->abs_secs  = phdr->ts.tv_sec;
  fdata->abs_usecs = phdr->ts.tv_usec;
  fdata->flags.encoding = CHAR_ASCII;
  fdata->flags.visited = 0;
  fdata->flags.marked = 0;

  passed = TRUE;
  if (cf->rfcode) {
    edt = epan_dissect_new(TRUE, FALSE);
    epan_dissect_prime_dfilter(edt, cf->rfcode);
    epan_dissect_run(edt, pseudo_header, buf, fdata, NULL);
    passed = dfilter_apply_edt(cf->rfcode, edt);
    epan_dissect_free(edt);
  }   
  if (passed) {
    plist_end = cf->plist_end;
    fdata->prev = plist_end;
    if (plist_end != NULL)
      plist_end->next = fdata;
    else
      cf->plist = fdata;
    cf->plist_end = fdata;

    cf->count++;
    fdata->num = cf->count;
    add_packet_to_packet_list(fdata, cf, pseudo_header, buf, TRUE);
  } else {
    /* XXX - if we didn't have read filters, or if we could avoid
       allocating the "frame_data" structure until we knew whether
       the frame passed the read filter, we could use a G_ALLOC_ONLY
       memory chunk...

       ...but, at least in one test I did, where I just made the chunk
       a G_ALLOC_ONLY chunk and read in a huge capture file, it didn't
       seem to save a noticeable amount of time or space. */
    g_mem_chunk_free(cf->plist_chunk, fdata);
  }
}

int
filter_packets(capture_file *cf, gchar *dftext)
{
  dfilter_t *dfcode;

  if (dftext == NULL) {
    /* The new filter is an empty filter (i.e., display all packets). */
    dfcode = NULL;
  } else {
    /*
     * We have a filter; make a copy of it (as we'll be saving it),
     * and try to compile it.
     */
    dftext = g_strdup(dftext);
    if (!dfilter_compile(dftext, &dfcode)) {
      /* The attempt failed; report an error. */
      simple_dialog(ESD_TYPE_CRIT, NULL, dfilter_error_msg);
      return 0;
    }

    /* Was it empty? */
    if (dfcode == NULL) {
      /* Yes - free the filter text, and set it to null. */
      g_free(dftext);
      dftext = NULL;
    }
  }

  /* We have a valid filter.  Replace the current filter. */
  if (cf->dfilter != NULL)
    g_free(cf->dfilter);
  cf->dfilter = dftext;
  if (cf->dfcode != NULL)
    dfilter_free(cf->dfcode);
  cf->dfcode = dfcode;

  /* Now rescan the packet list, applying the new filter, but not
     throwing away information constructed on a previous pass. */
  if (dftext == NULL) {
    rescan_packets(cf, "Resetting", "Filter", TRUE, FALSE);
  } else {
    rescan_packets(cf, "Filtering", dftext, TRUE, FALSE);
  }
  return 1;
}

void
colorize_packets(capture_file *cf)
{
  rescan_packets(cf, "Colorizing", "all frames", FALSE, FALSE);
}

void
redissect_packets(capture_file *cf)
{
  rescan_packets(cf, "Reprocessing", "all frames", TRUE, TRUE);
}

/* Rescan the list of packets, reconstructing the CList.

   "action" describes why we're doing this; it's used in the progress
   dialog box.

   "action_item" describes what we're doing; it's used in the progress
   dialog box.

   "refilter" is TRUE if we need to re-evaluate the filter expression.

   "redissect" is TRUE if we need to make the dissectors reconstruct
   any state information they have (because a preference that affects
   some dissector has changed, meaning some dissector might construct
   its state differently from the way it was constructed the last time). */
static void
rescan_packets(capture_file *cf, const char *action, const char *action_item,
		gboolean refilter, gboolean redissect)
{
  frame_data *fdata;
  progdlg_t  *progbar = NULL;
  gboolean    stop_flag;
  int         count;
  int         err;
  frame_data *selected_frame;
  int         selected_row;
  int         row;
  float       prog_val;
  GTimeVal    start_time;
  gchar       status_str[100];

  /* Which frame, if any, is the currently selected frame?
     XXX - should the selected frame or the focus frame be the "current"
     frame, that frame being the one from which "Find Frame" searches
     start? */
  selected_frame = cf->current_frame;

  /* We don't yet know what row that frame will be on, if any, after we
     rebuild the clist, however. */
  selected_row = -1;

  if (redissect) {
    /* We need to re-initialize all the state information that protocols
       keep, because some preference that controls a dissector has changed,
       which might cause the state information to be constructed differently
       by that dissector. */

    /* Initialize all data structures used for dissection. */
    init_dissection();
  }

  /* Freeze the packet list while we redo it, so we don't get any
     screen updates while it happens. */
  gtk_clist_freeze(GTK_CLIST(packet_list));

  /* Clear it out. */
  gtk_clist_clear(GTK_CLIST(packet_list));

  /* We don't yet know which will be the first and last frames displayed. */
  cf->first_displayed = NULL;
  cf->last_displayed = NULL;

  /* Iterate through the list of frames.  Call a routine for each frame
     to check whether it should be displayed and, if so, add it to
     the display list. */
  firstsec = 0;
  firstusec = 0;
  prevsec = 0;
  prevusec = 0;

  /* Update the progress bar when it gets to this value. */
  cf->progbar_nextstep = 0;
  /* When we reach the value that triggers a progress bar update,
     bump that value by this amount. */
  cf->progbar_quantum = cf->count/N_PROGBAR_UPDATES;
  /* Count of packets at which we've looked. */
  count = 0;

  stop_flag = FALSE;
  g_get_current_time(&start_time);

  for (fdata = cf->plist; fdata != NULL; fdata = fdata->next) {
    /* Update the progress bar, but do it only N_PROGBAR_UPDATES times;
       when we update it, we have to run the GTK+ main loop to get it
       to repaint what's pending, and doing so may involve an "ioctl()"
       to see if there's any pending input from an X server, and doing
       that for every packet can be costly, especially on a big file. */
    if (count >= cf->progbar_nextstep) {
      /* let's not divide by zero. I should never be started
       * with count == 0, so let's assert that
       */
      g_assert(cf->count > 0);
      prog_val = (gfloat) count / cf->count;

      if (progbar == NULL)
        /* Create the progress bar if necessary */
        progbar = delayed_create_progress_dlg(action, action_item, "Stop", &stop_flag,
          &start_time, prog_val);

      if (progbar != NULL) {
        g_snprintf(status_str, sizeof(status_str),
                  "%4u of %u frames", count, cf->count);
        update_progress_dlg(progbar, prog_val, status_str);
      }

      cf->progbar_nextstep += cf->progbar_quantum;
    }

    if (stop_flag) {
      /* Well, the user decided to abort the filtering.  Just stop.

         XXX - go back to the previous filter?  Users probably just
	 want not to wait for a filtering operation to finish;
	 unless we cancel by having no filter, reverting to the
	 previous filter will probably be even more expensive than
	 continuing the filtering, as it involves going back to the
	 beginning and filtering, and even with no filter we currently
	 have to re-generate the entire clist, which is also expensive.

	 I'm not sure what Network Monitor does, but it doesn't appear
	 to give you an unfiltered display if you cancel. */
      break;
    }

    count++;

    if (redissect) {
      /* Since all state for the frame was destroyed, mark the frame
       * as not visited, free the GSList referring to the state
       * data (the per-frame data itself was freed by
       * "init_dissection()"), and null out the GSList pointer. */
      fdata->flags.visited = 0;
      if (fdata->pfd) {
	g_slist_free(fdata->pfd);
        fdata->pfd = NULL;
      }
    }

    /* XXX - do something with "err" */
    wtap_seek_read (cf->wth, fdata->file_off, &cf->pseudo_header,
    	cf->pd, fdata->cap_len, &err);

    row = add_packet_to_packet_list(fdata, cf, &cf->pseudo_header, cf->pd,
					refilter);
    if (fdata == selected_frame)
      selected_row = row;
  }
 
  if (redissect) {
    /* Clear out what remains of the visited flags and per-frame data
       pointers.

       XXX - that may cause various forms of bogosity when dissecting
       these frames, as they won't have been seen by this sequential
       pass, but the only alternative I see is to keep scanning them
       even though the user requested that the scan stop, and that
       would leave the user stuck with an Ethereal grinding on
       until it finishes.  Should we just stick them with that? */
    for (; fdata != NULL; fdata = fdata->next) {
      fdata->flags.visited = 0;
      if (fdata->pfd) {
	g_slist_free(fdata->pfd);
        fdata->pfd = NULL;
      }
    }
  }

  /* We're done filtering the packets; destroy the progress bar if it
     was created. */
  if (progbar != NULL)
    destroy_progress_dlg(progbar);

  /* Unfreeze the packet list. */
  gtk_clist_thaw(GTK_CLIST(packet_list));

  if (selected_row != -1) {
    /* The frame that was selected passed the filter; select it, make it
       the focus row, and make it visible. */
    set_selected_row(selected_row);
    finfo_selected = NULL;
  } else {
    /* The selected frame didn't pass the filter; make the first frame
       the current frame, and leave it unselected. */
    unselect_packet(cf);
    cf->current_frame = cf->first_displayed;
  }
}

int
print_packets(capture_file *cf, print_args_t *print_args)
{
  int         i;
  frame_data *fdata;
  progdlg_t  *progbar = NULL;
  gboolean    stop_flag;
  int         count;
  int         err;
  gint       *col_widths = NULL;
  gint        data_width;
  gboolean    print_separator;
  char       *line_buf = NULL;
  int         line_buf_len = 256;
  char        *cp;
  int         column_len;
  int         line_len;
  epan_dissect_t *edt = NULL;
  float       prog_val;
  GTimeVal    start_time;
  gchar       status_str[100];

  cf->print_fh = open_print_dest(print_args->to_file, print_args->dest);
  if (cf->print_fh == NULL)
    return FALSE;	/* attempt to open destination failed */

  print_preamble(cf->print_fh, print_args->format);

  if (print_args->print_summary) {
    /* We're printing packet summaries.  Allocate the line buffer at
       its initial length. */
    line_buf = g_malloc(line_buf_len + 1);

    /* Find the widths for each of the columns - maximum of the
       width of the title and the width of the data - and print
       the column titles. */
    col_widths = (gint *) g_malloc(sizeof(gint) * cf->cinfo.num_cols);
    cp = &line_buf[0];
    line_len = 0;
    for (i = 0; i < cf->cinfo.num_cols; i++) {
      /* Don't pad the last column. */
      if (i == cf->cinfo.num_cols - 1)
        col_widths[i] = 0;
      else {
        col_widths[i] = strlen(cf->cinfo.col_title[i]);
        data_width = get_column_char_width(get_column_format(i));
        if (data_width > col_widths[i])
          col_widths[i] = data_width;
      }

      /* Find the length of the string for this column. */
      column_len = strlen(cf->cinfo.col_title[i]);
      if (col_widths[i] > column_len)
        column_len = col_widths[i];

      /* Make sure there's room in the line buffer for the column; if not,
         double its length. */
      line_len += column_len + 1;	/* "+1" for space */
      if (line_len > line_buf_len) {
        line_buf_len *= 2;
        line_buf = g_realloc(line_buf, line_buf_len + 1);
      }

      /* Right-justify the packet number column. */
      if (cf->cinfo.col_fmt[i] == COL_NUMBER)
        sprintf(cp, "%*s", col_widths[i], cf->cinfo.col_title[i]);
      else
        sprintf(cp, "%-*s", col_widths[i], cf->cinfo.col_title[i]);
      cp += column_len;
      if (i != cf->cinfo.num_cols - 1)
        *cp++ = ' ';
    }
    *cp = '\0';
    print_line(cf->print_fh, 0, print_args->format, line_buf);
  }

  print_separator = FALSE;

  /* Update the progress bar when it gets to this value. */
  cf->progbar_nextstep = 0;
  /* When we reach the value that triggers a progress bar update,
     bump that value by this amount. */
  cf->progbar_quantum = cf->count/N_PROGBAR_UPDATES;
  /* Count of packets at which we've looked. */
  count = 0;

  stop_flag = FALSE;
  g_get_current_time(&start_time);

  /* Iterate through the list of packets, printing the packets that
     were selected by the current display filter.  */
  for (fdata = cf->plist; fdata != NULL; fdata = fdata->next) {
    /* Update the progress bar, but do it only N_PROGBAR_UPDATES times;
       when we update it, we have to run the GTK+ main loop to get it
       to repaint what's pending, and doing so may involve an "ioctl()"
       to see if there's any pending input from an X server, and doing
       that for every packet can be costly, especially on a big file. */
    if (count >= cf->progbar_nextstep) {
      /* let's not divide by zero. I should never be started
       * with count == 0, so let's assert that
       */
      g_assert(cf->count > 0);
      prog_val = (gfloat) count / cf->count;

      if (progbar == NULL)
        /* Create the progress bar if necessary */
        progbar = delayed_create_progress_dlg("Printing", "selected frames", "Stop", &stop_flag,
          &start_time, prog_val);

      if (progbar != NULL) {
        g_snprintf(status_str, sizeof(status_str),
                   "%4u of %u frames", count, cf->count);
        update_progress_dlg(progbar, prog_val, status_str);
      }

      cf->progbar_nextstep += cf->progbar_quantum;
    }

    if (stop_flag) {
      /* Well, the user decided to abort the printing.  Just stop.

         XXX - note that what got generated before they did that
	 will get printed, as we're piping to a print program; we'd
	 have to write to a file and then hand that to the print
	 program to make it actually not print anything. */
      break;
    }

    count++;
    /* Check to see if we are suppressing unmarked packets, if so, 
     * suppress them and then proceed to check for visibility.
     */
    if (((print_args->suppress_unmarked && fdata->flags.marked ) ||
        !(print_args->suppress_unmarked)) && fdata->flags.passed_dfilter) {
      /* XXX - do something with "err" */
      wtap_seek_read (cf->wth, fdata->file_off, &cf->pseudo_header,
      			cf->pd, fdata->cap_len, &err);
      if (print_args->print_summary) {
        /* Fill in the column information, but don't bother creating
           the logical protocol tree. */
        edt = epan_dissect_new(FALSE, FALSE);
        epan_dissect_run(edt, &cf->pseudo_header, cf->pd, fdata, &cf->cinfo);
        epan_dissect_fill_in_columns(edt);
        cp = &line_buf[0];
        line_len = 0;
        for (i = 0; i < cf->cinfo.num_cols; i++) {
          /* Find the length of the string for this column. */
          column_len = strlen(cf->cinfo.col_data[i]);
          if (col_widths[i] > column_len)
            column_len = col_widths[i];

          /* Make sure there's room in the line buffer for the column; if not,
             double its length. */
          line_len += column_len + 1;	/* "+1" for space */
          if (line_len > line_buf_len) {
            line_buf_len *= 2;
            line_buf = g_realloc(line_buf, line_buf_len + 1);
          }

          /* Right-justify the packet number column. */
          if (cf->cinfo.col_fmt[i] == COL_NUMBER)
            sprintf(cp, "%*s", col_widths[i], cf->cinfo.col_data[i]);
          else
            sprintf(cp, "%-*s", col_widths[i], cf->cinfo.col_data[i]);
          cp += column_len;
          if (i != cf->cinfo.num_cols - 1)
            *cp++ = ' ';
        }
        *cp = '\0';
        print_line(cf->print_fh, 0, print_args->format, line_buf);
      } else {
        if (print_separator)
          print_line(cf->print_fh, 0, print_args->format, "");

        /* Create the logical protocol tree, complete with the display
           representation of the items; we don't need the columns here,
           however. */
        edt = epan_dissect_new(TRUE, TRUE);
        epan_dissect_run(edt, &cf->pseudo_header, cf->pd, fdata, NULL);

        /* Print the information in that tree. */
        proto_tree_print(print_args, edt, cf->print_fh);

	if (print_args->print_hex) {
	  /* Print the full packet data as hex. */
	  print_hex_data(cf->print_fh, print_args->format, edt);
	}

        /* Print a blank line if we print anything after this. */
        print_separator = TRUE;
      }
      epan_dissect_free(edt);
    }
  }

  /* We're done printing the packets; destroy the progress bar if
     it was created. */
  if (progbar != NULL)
    destroy_progress_dlg(progbar);

  if (col_widths != NULL)
    g_free(col_widths);
  if (line_buf != NULL)
    g_free(line_buf);

  print_finale(cf->print_fh, print_args->format);

  close_print_dest(print_args->to_file, cf->print_fh);
 
  cf->print_fh = NULL;

  return TRUE;
}

/* Scan through the packet list and change all columns that use the
   "command-line-specified" time stamp format to use the current
   value of that format. */
void
change_time_formats(capture_file *cf)
{
  frame_data *fdata;
  progdlg_t  *progbar = NULL;
  gboolean    stop_flag;
  int         count;
  int         row;
  int         i;
  GtkStyle   *pl_style;
  float       prog_val;
  GTimeVal    start_time;
  gchar       status_str[100];

  /* Are there any columns with time stamps in the "command-line-specified"
     format?

     XXX - we have to force the "column is writable" flag on, as it
     might be off from the last frame that was dissected. */
  col_set_writable(&cf->cinfo, TRUE);
  if (!check_col(&cf->cinfo, COL_CLS_TIME)) {
    /* No, there aren't any columns in that format, so we have no work
       to do. */
    return;
  }

  /* Freeze the packet list while we redo it, so we don't get any
     screen updates while it happens. */
  freeze_clist(cf);

  /* Update the progress bar when it gets to this value. */
  cf->progbar_nextstep = 0;
  /* When we reach the value that triggers a progress bar update,
     bump that value by this amount. */
  cf->progbar_quantum = cf->count/N_PROGBAR_UPDATES;
  /* Count of packets at which we've looked. */
  count = 0;

  stop_flag = FALSE;
  g_get_current_time(&start_time);

  /* Iterate through the list of packets, checking whether the packet
     is in a row of the summary list and, if so, whether there are
     any columns that show the time in the "command-line-specified"
     format and, if so, update that row. */
  for (fdata = cf->plist; fdata != NULL; fdata = fdata->next) {
    /* Update the progress bar, but do it only N_PROGBAR_UPDATES times;
       when we update it, we have to run the GTK+ main loop to get it
       to repaint what's pending, and doing so may involve an "ioctl()"
       to see if there's any pending input from an X server, and doing
       that for every packet can be costly, especially on a big file. */
    if (count >= cf->progbar_nextstep) {
      /* let's not divide by zero. I should never be started
       * with count == 0, so let's assert that
       */
      g_assert(cf->count > 0);

      prog_val = (gfloat) count / cf->count;

      if (progbar == NULL)
        /* Create the progress bar if necessary */
        progbar = delayed_create_progress_dlg("Changing", "time display", "Stop",
          &stop_flag, &start_time, prog_val);

      if (progbar != NULL) {
        g_snprintf(status_str, sizeof(status_str),
                   "%4u of %u frames", count, cf->count);
        update_progress_dlg(progbar, prog_val, status_str);
      }

      cf->progbar_nextstep += cf->progbar_quantum;
    }

    if (stop_flag) {
      /* Well, the user decided to abort the redisplay.  Just stop.

         XXX - this leaves the time field in the old format in
	 frames we haven't yet processed.  So it goes; should we
	 simply not offer them the option of stopping? */
      break;
    }

    count++;

    /* Find what row this packet is in. */
    row = gtk_clist_find_row_from_data(GTK_CLIST(packet_list), fdata);

    if (row != -1) {
      /* This packet is in the summary list, on row "row". */

      for (i = 0; i < cf->cinfo.num_cols; i++) {
        if (cf->cinfo.fmt_matx[i][COL_CLS_TIME]) {
          /* This is one of the columns that shows the time in
             "command-line-specified" format; update it. */
          cf->cinfo.col_buf[i][0] = '\0';
          col_set_cls_time(fdata, &cf->cinfo, i);
          gtk_clist_set_text(GTK_CLIST(packet_list), row, i,
			     cf->cinfo.col_data[i]);
        }
      }
    }
  }

  /* We're done redisplaying the packets; destroy the progress bar if it
     was created. */
  if (progbar != NULL)
    destroy_progress_dlg(progbar);

  /* Set the column widths of those columns that show the time in
     "command-line-specified" format. */
  pl_style = gtk_widget_get_style(packet_list);
  for (i = 0; i < cf->cinfo.num_cols; i++) {
    if (cf->cinfo.fmt_matx[i][COL_CLS_TIME]) {
      gtk_clist_set_column_width(GTK_CLIST(packet_list), i,
        gdk_string_width(pl_style->font, get_column_longest_string(COL_CLS_TIME)));
    }
  }

  /* Unfreeze the packet list. */
  thaw_clist(cf);
}

gboolean
find_packet(capture_file *cf, dfilter_t *sfcode)
{
  frame_data *start_fd;
  frame_data *fdata;
  frame_data *new_fd = NULL;
  progdlg_t  *progbar = NULL;
  gboolean    stop_flag;
  int         count;
  int         err;
  gboolean    frame_matched;
  int         row;
  epan_dissect_t	*edt;
  float       prog_val;
  GTimeVal    start_time;
  gchar       status_str[100];

  start_fd = cf->current_frame;
  if (start_fd != NULL)  {
    /* Iterate through the list of packets, starting at the packet we've
       picked, calling a routine to run the filter on the packet, see if
       it matches, and stop if so.  */
    count = 0;
    fdata = start_fd;

    cf->progbar_nextstep = 0;
    /* When we reach the value that triggers a progress bar update,
       bump that value by this amount. */
    cf->progbar_quantum = cf->count/N_PROGBAR_UPDATES;

    stop_flag = FALSE;
    g_get_current_time(&start_time);

    fdata = start_fd;
    for (;;) {
      /* Update the progress bar, but do it only N_PROGBAR_UPDATES times;
         when we update it, we have to run the GTK+ main loop to get it
         to repaint what's pending, and doing so may involve an "ioctl()"
         to see if there's any pending input from an X server, and doing
         that for every packet can be costly, especially on a big file. */
      if (count >= cf->progbar_nextstep) {
        /* let's not divide by zero. I should never be started
         * with count == 0, so let's assert that
         */
        g_assert(cf->count > 0);

        prog_val = (gfloat) count / cf->count;

        /* Create the progress bar if necessary */
        if (progbar == NULL)
           progbar = delayed_create_progress_dlg("Searching", cf->sfilter, "Cancel",
             &stop_flag, &start_time, prog_val);
        
        if (progbar != NULL) {
          g_snprintf(status_str, sizeof(status_str),
                     "%4u of %u frames", count, cf->count);
          update_progress_dlg(progbar, prog_val, status_str);
        }

        cf->progbar_nextstep += cf->progbar_quantum;
      }

      if (stop_flag) {
        /* Well, the user decided to abort the search.  Go back to the
           frame where we started. */
        new_fd = start_fd;
        break;
      }

      /* Go past the current frame. */
      if (cf->sbackward) {
        /* Go on to the previous frame. */
        fdata = fdata->prev;
        if (fdata == NULL)
          fdata = cf->plist_end;	/* wrap around */
      } else {
        /* Go on to the next frame. */
        fdata = fdata->next;
        if (fdata == NULL)
          fdata = cf->plist;	/* wrap around */
      }

      count++;

      /* Is this packet in the display? */
      if (fdata->flags.passed_dfilter) {
        /* Yes.  Does it match the search filter? */
        /* XXX - do something with "err" */
        wtap_seek_read(cf->wth, fdata->file_off, &cf->pseudo_header,
        		cf->pd, fdata->cap_len, &err);
        edt = epan_dissect_new(TRUE, FALSE);
        epan_dissect_prime_dfilter(edt, sfcode);
        epan_dissect_run(edt, &cf->pseudo_header, cf->pd, fdata, NULL);
        frame_matched = dfilter_apply_edt(sfcode, edt);
        epan_dissect_free(edt);
        if (frame_matched) {
          new_fd = fdata;
          break;	/* found it! */
        }
      }

      if (fdata == start_fd) {
        /* We're back to the frame we were on originally, and that frame
	   doesn't match the search filter.  The search failed. */
        break;
      }
    }

    /* We're done scanning the packets; destroy the progress bar if it
       was created. */
    if (progbar != NULL)
      destroy_progress_dlg(progbar);
  }

  if (new_fd != NULL) {
    /* We found a frame.  Find what row it's in. */
    row = gtk_clist_find_row_from_data(GTK_CLIST(packet_list), new_fd);
    g_assert(row != -1);

    /* Select that row, make it the focus row, and make it visible. */
    set_selected_row(row);
    return TRUE;	/* success */
  } else
    return FALSE;	/* failure */
}

goto_result_t
goto_frame(capture_file *cf, guint fnumber)
{
  frame_data *fdata;
  int row;

  for (fdata = cf->plist; fdata != NULL && fdata->num < fnumber; fdata = fdata->next)
    ;

  if (fdata == NULL)
    return NO_SUCH_FRAME;	/* we didn't find that frame */
  if (!fdata->flags.passed_dfilter)
    return FRAME_NOT_DISPLAYED;	/* the frame with that number isn't displayed */

  /* We found that frame, and it's currently being displayed.
     Find what row it's in. */
  row = gtk_clist_find_row_from_data(GTK_CLIST(packet_list), fdata);
  g_assert(row != -1);

  /* Select that row, make it the focus row, and make it visible. */
  set_selected_row(row);
  return FOUND_FRAME;
}

/* Select the packet on a given row. */
void
select_packet(capture_file *cf, int row)
{
  frame_data *fdata;
  int err;

  /* Get the frame data struct pointer for this frame */
  fdata = (frame_data *) gtk_clist_get_row_data(GTK_CLIST(packet_list), row);

  if (fdata == NULL) {
    /* XXX - if a GtkCList's selection mode is GTK_SELECTION_BROWSE, when
       the first entry is added to it by "real_insert_row()", that row
       is selected (see "real_insert_row()", in "gtk/gtkclist.c", in both
       our version and the vanilla GTK+ version).

       This means that a "select-row" signal is emitted; this causes
       "packet_list_select_cb()" to be called, which causes "select_packet()"
       to be called.

       "select_packet()" fetches, above, the data associated with the
       row that was selected; however, as "gtk_clist_append()", which
       called "real_insert_row()", hasn't yet returned, we haven't yet
       associated any data with that row, so we get back a null pointer.

       We can't assume that there's only one frame in the frame list,
       either, as we may be filtering the display.

       We therefore assume that, if "row" is 0, i.e. the first row
       is being selected, and "cf->first_displayed" equals
       "cf->last_displayed", i.e. there's only one frame being
       displayed, that frame is the frame we want.

       This means we have to set "cf->first_displayed" and
       "cf->last_displayed" before adding the row to the
       GtkCList; see the comment in "add_packet_to_packet_list()". */

       if (row == 0 && cf->first_displayed == cf->last_displayed)
         fdata = cf->first_displayed;
  }

  /* Record that this frame is the current frame. */
  cf->current_frame = fdata;

  /* Get the data in that frame. */
  /* XXX - do something with "err" */
  wtap_seek_read (cf->wth, fdata->file_off, &cf->pseudo_header,
  			cf->pd, fdata->cap_len, &err);

  /* Create the logical protocol tree. */
  if (cf->edt != NULL) {
    epan_dissect_free(cf->edt);
    cf->edt = NULL;
  }
  /* We don't need the columns here. */
  cf->edt = epan_dissect_new(TRUE, TRUE);
  epan_dissect_run(cf->edt, &cf->pseudo_header, cf->pd, cf->current_frame,
          NULL);

  /* Display the GUI protocol tree and hex dump.
     XXX - why do we dump core if we call "proto_tree_draw()"
     before calling "add_byte_views()"? */
  add_byte_views(cf->edt, tree_view, byte_nb_ptr);
  proto_tree_draw(cf->edt->tree, tree_view);

  /* A packet is selected. */
  set_menus_for_selected_packet(TRUE);
}

/* Unselect the selected packet, if any. */
void
unselect_packet(capture_file *cf)
{
  /* Destroy the epan_dissect_t for the unselected packet. */
  if (cf->edt != NULL) {
    epan_dissect_free(cf->edt);
    cf->edt = NULL;
  }

  /* Clear out the display of that packet. */
  clear_tree_and_hex_views();

  /* No packet is selected. */
  set_menus_for_selected_packet(FALSE);

  /* No protocol tree means no selected field. */
  unselect_field();
}

/* Set the selected row and the focus row of the packet list to the specified
   row, and make it visible if it's not currently visible. */
static void
set_selected_row(int row)
{
  if (gtk_clist_row_is_visible(GTK_CLIST(packet_list), row) != GTK_VISIBILITY_FULL)
    gtk_clist_moveto(GTK_CLIST(packet_list), row, -1, 0.0, 0.0);

  /* XXX - why is there no "gtk_clist_set_focus_row()", so that we
     can make the row for the frame we found the focus row?

     See

 http://www.gnome.org/mailing-lists/archives/gtk-list/2000-January/0038.shtml

     */
  GTK_CLIST(packet_list)->focus_row = row;

  gtk_clist_select_row(GTK_CLIST(packet_list), row, -1);
}

/* Unset the selected protocol tree field, if any. */
void
unselect_field(void)
{
  statusbar_pop_field_msg();
  finfo_selected = NULL;
  set_menus_for_selected_tree_row(FALSE);
}

/*
 * Mark a particular frame.
 */
void
mark_frame(capture_file *cf, frame_data *frame)
{
  frame->flags.marked = TRUE;
  cf->marked_count++;
}

/*
 * Unmark a particular frame.
 */
void
unmark_frame(capture_file *cf, frame_data *frame)
{
  frame->flags.marked = FALSE;
  cf->marked_count--;
}

static void
freeze_clist(capture_file *cf)
{
  int i;

  /* Make the column sizes static, so they don't adjust while
     we're reading the capture file (freezing the clist doesn't
     seem to suffice). */
  for (i = 0; i < cf->cinfo.num_cols; i++)
    gtk_clist_set_column_auto_resize(GTK_CLIST(packet_list), i, FALSE);
  gtk_clist_freeze(GTK_CLIST(packet_list));
}

static void
thaw_clist(capture_file *cf)
{
  int i;

  for (i = 0; i < cf->cinfo.num_cols; i++) {
    if (get_column_resize_type(cf->cinfo.col_fmt[i]) == RESIZE_MANUAL) {
      /* Set this column's width to the appropriate value. */
      gtk_clist_set_column_width(GTK_CLIST(packet_list), i,
				cf->cinfo.col_width[i]);
    } else {
      /* Make this column's size dynamic, so that it adjusts to the
         appropriate size. */
      gtk_clist_set_column_auto_resize(GTK_CLIST(packet_list), i, TRUE);
    }
  }
  gtk_clist_thaw(GTK_CLIST(packet_list));

  /* Hopefully, the columns have now gotten their appropriate sizes;
     make them resizeable - a column that auto-resizes cannot be
     resized by the user, and *vice versa*. */
  for (i = 0; i < cf->cinfo.num_cols; i++)
    gtk_clist_set_column_resizeable(GTK_CLIST(packet_list), i, TRUE);
}

/*
 * Save a capture to a file, in a particular format, saving either
 * all packets, all currently-displayed packets, or all marked packets.
 *
 * Returns TRUE if it succeeds, FALSE otherwise; if it fails, it pops
 * up a message box for the failure.
 */
gboolean
save_cap_file(char *fname, capture_file *cf, gboolean save_filtered,
		gboolean save_marked, guint save_format)
{
  gchar        *from_filename;
  gchar        *name_ptr, *save_msg, *save_fmt = " Saving: %s...";
  size_t        msg_len;
  int           err;
  gboolean      do_copy;
  wtap_dumper  *pdh;
  frame_data   *fdata;
  struct wtap_pkthdr hdr;
  union wtap_pseudo_header pseudo_header;
  guint8        pd[65536];
  struct stat   infile, outfile;

  name_ptr = get_basename(fname);
  msg_len = strlen(name_ptr) + strlen(save_fmt) + 2;
  save_msg = g_malloc(msg_len);
  snprintf(save_msg, msg_len, save_fmt, name_ptr);
  statusbar_push_file_msg(save_msg);
  g_free(save_msg);

  /* 
   * Check that the from file is not the same as to file 
   * We do it here so we catch all cases ...
   * Unfortunately, the file requester gives us an absolute file
   * name and the read file name may be relative (if supplied on
   * the command line). From Joerg Mayer.
   */
   infile.st_ino = 1;   /* These prevent us from getting equality         */
   outfile.st_ino = 2;  /* If one or other of the files is not accessible */
   stat(cf->filename, &infile);
   stat(fname, &outfile);
   if (infile.st_ino == outfile.st_ino) {
    simple_dialog(ESD_TYPE_CRIT, NULL, 
		      "Can't save over current capture file: %s!",
		      cf->filename);
    goto fail;
  }

  if (!save_filtered && !save_marked && save_format == cf->cd_t) {
    /* We're not filtering packets, and we're saving it in the format
       it's already in, so we can just move or copy the raw data. */

    if (cf->is_tempfile) {
      /* The file being saved is a temporary file from a live
         capture, so it doesn't need to stay around under that name;
	 first, try renaming the capture buffer file to the new name. */
#ifndef WIN32
      if (rename(cf->filename, fname) == 0) {
      	/* That succeeded - there's no need to copy the source file. */
      	from_filename = NULL;
	do_copy = FALSE;
      } else {
      	if (errno == EXDEV) {
	  /* They're on different file systems, so we have to copy the
	     file. */
	  do_copy = TRUE;
          from_filename = cf->filename;
	} else {
	  /* The rename failed, but not because they're on different
	     file systems - put up an error message.  (Or should we
	     just punt and try to copy?  The only reason why I'd
	     expect the rename to fail and the copy to succeed would
	     be if we didn't have permission to remove the file from
	     the temporary directory, and that might be fixable - but
	     is it worth requiring the user to go off and fix it?) */
	  simple_dialog(ESD_TYPE_CRIT, NULL,
				file_rename_error_message(errno), fname);
	  goto fail;
	}
      }
#else
      do_copy = TRUE;
      from_filename = cf->filename;
#endif
    } else {
      /* It's a permanent file, so we should copy it, and not remove the
         original. */
      do_copy = TRUE;
      from_filename = cf->filename;
    }

    if (do_copy) {
      /* Copy the file, if we haven't moved it. */
      if (!copy_binary_file(from_filename, fname))
	goto fail;
    }
  } else {
    /* Either we're filtering packets, or we're saving in a different
       format; we can't do that by copying or moving the capture file,
       we have to do it by writing the packets out in Wiretap. */
    pdh = wtap_dump_open(fname, save_format, cf->lnk_t, cf->snap, &err);
    if (pdh == NULL) {
      simple_dialog(ESD_TYPE_CRIT, NULL,
			file_open_error_message(err, TRUE, save_format), fname);
      goto fail;
    }

    /* XXX - have a way to save only the packets currently selected by
       the display filter or the marked ones.

       If we do that, should we make that file the current file?  If so,
       it means we can no longer get at the other packets.  What does
       NetMon do? */
    for (fdata = cf->plist; fdata != NULL; fdata = fdata->next) {
      /* XXX - do a progress bar */
      if ((!save_filtered && !save_marked) ||
	  (save_filtered && fdata->flags.passed_dfilter && !save_marked) ||
	  (save_marked && fdata->flags.marked && !save_filtered) ||
	  (save_filtered && save_marked && fdata->flags.passed_dfilter &&
	   fdata->flags.marked)) {
      	/* Either :
	   - we're saving all frames, or
	   - we're saving filtered frames and this one passed the display filter or
	   - we're saving marked frames (and it has been marked) or
	   - we're saving filtered _and_ marked frames,
	   save it. */
        hdr.ts.tv_sec = fdata->abs_secs;
        hdr.ts.tv_usec = fdata->abs_usecs;
        hdr.caplen = fdata->cap_len;
        hdr.len = fdata->pkt_len;
        hdr.pkt_encap = fdata->lnk_t;
	if (!wtap_seek_read(cf->wth, fdata->file_off, &pseudo_header,
		pd, fdata->cap_len, &err)) {
	  simple_dialog(ESD_TYPE_CRIT, NULL,
				file_read_error_message(err), cf->filename);
	  wtap_dump_close(pdh, &err);
          goto fail;
	}

        if (!wtap_dump(pdh, &hdr, &pseudo_header, pd, &err)) {
	  simple_dialog(ESD_TYPE_CRIT, NULL,
				file_write_error_message(err), fname);
	  wtap_dump_close(pdh, &err);
          goto fail;
	}
      }
    }

    if (!wtap_dump_close(pdh, &err)) {
      simple_dialog(ESD_TYPE_WARN, NULL,
		file_close_error_message(err), fname);
      goto fail;
    }
  }

  /* Pop the "Saving:" message off the status bar. */
  statusbar_pop_file_msg();
  if (!save_filtered && !save_marked) {
    /* We saved the entire capture, not just some packets from it.
       Open and read the file we saved it to.

       XXX - this is somewhat of a waste; we already have the
       packets, all this gets us is updated file type information
       (which we could just stuff into "cf"), and having the new
       file be the one we have opened and from which we're reading
       the data, and it means we have to spend time opening and
       reading the file, which could be a significant amount of
       time if the file is large. */
    cf->user_saved = TRUE;

    if ((err = open_cap_file(fname, FALSE, cf)) == 0) {
      /* XXX - report errors if this fails?
         What should we return if it fails or is aborted? */
      switch (read_cap_file(cf, &err)) {

      case READ_SUCCESS:
      case READ_ERROR:
	/* Just because we got an error, that doesn't mean we were unable
	   to read any of the file; we handle what we could get from the
	   file. */
	break;

      case READ_ABORTED:
	/* The user bailed out of re-reading the capture file; the
	   capture file has been closed - just return (without
	   changing any menu settings; "close_cap_file()" set them
	   correctly for the "no capture file open" state). */
	break;
      }
      set_menus_for_unsaved_capture_file(FALSE);
    }
  }
  return TRUE;

fail:
  /* Pop the "Saving:" message off the status bar. */
  statusbar_pop_file_msg();
  return FALSE;
}

char *
file_open_error_message(int err, gboolean for_writing, int file_type)
{
  char *errmsg;
  static char errmsg_errno[1024+1];

  switch (err) {

  case WTAP_ERR_NOT_REGULAR_FILE:
    errmsg = "The file \"%s\" is a \"special file\" or socket or other non-regular file.";
    break;

  case WTAP_ERR_RANDOM_OPEN_PIPE:
    /* Seen only when opening a capture file for reading. */
    errmsg = "The file \"%s\" is a pipe or FIFO; Ethereal cannot read pipe or FIFO files.";
    break;

  case WTAP_ERR_FILE_UNKNOWN_FORMAT:
  case WTAP_ERR_UNSUPPORTED:
    /* Seen only when opening a capture file for reading. */
    errmsg = "The file \"%s\" is not a capture file in a format Ethereal understands.";
    break;

  case WTAP_ERR_CANT_WRITE_TO_PIPE:
    /* Seen only when opening a capture file for writing. */
    snprintf(errmsg_errno, sizeof(errmsg_errno),
	     "The file \"%%s\" is a pipe, and %s capture files cannot be "
	     "written to a pipe.", wtap_file_type_string(file_type));
    errmsg = errmsg_errno;
    break;

  case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
    /* Seen only when opening a capture file for writing. */
    errmsg = "Ethereal does not support writing capture files in that format.";
    break;

  case WTAP_ERR_UNSUPPORTED_ENCAP:
  case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
    if (for_writing)
      errmsg = "Ethereal cannot save this capture in that format.";
    else
      errmsg = "The file \"%s\" is a capture for a network type that Ethereal doesn't support.";
    break;

  case WTAP_ERR_BAD_RECORD:
    errmsg = "The file \"%s\" appears to be damaged or corrupt.";
    break;

  case WTAP_ERR_CANT_OPEN:
    if (for_writing)
      errmsg = "The file \"%s\" could not be created for some unknown reason.";
    else
      errmsg = "The file \"%s\" could not be opened for some unknown reason.";
    break;

  case WTAP_ERR_SHORT_READ:
    errmsg = "The file \"%s\" appears to have been cut short"
             " in the middle of a packet or other data.";
    break;

  case WTAP_ERR_SHORT_WRITE:
    errmsg = "A full header couldn't be written to the file \"%s\".";
    break;

  case ENOENT:
    if (for_writing)
      errmsg = "The path to the file \"%s\" does not exist.";
    else
      errmsg = "The file \"%s\" does not exist.";
    break;

  case EACCES:
    if (for_writing)
      errmsg = "You do not have permission to create or write to the file \"%s\".";
    else
      errmsg = "You do not have permission to read the file \"%s\".";
    break;

  case EISDIR:
    errmsg = "\"%s\" is a directory (folder), not a file.";
    break;

  default:
    snprintf(errmsg_errno, sizeof(errmsg_errno),
		    "The file \"%%s\" could not be %s: %s.",
				for_writing ? "created" : "opened",
				wtap_strerror(err));
    errmsg = errmsg_errno;
    break;
  }
  return errmsg;
}

static char *
file_rename_error_message(int err)
{
  char *errmsg;
  static char errmsg_errno[1024+1];

  switch (err) {

  case ENOENT:
    errmsg = "The path to the file \"%s\" does not exist.";
    break;

  case EACCES:
    errmsg = "You do not have permission to move the capture file to \"%s\".";
    break;

  default:
    snprintf(errmsg_errno, sizeof(errmsg_errno),
		    "The file \"%%s\" could not be moved: %s.",
				wtap_strerror(err));
    errmsg = errmsg_errno;
    break;
  }
  return errmsg;
}

char *
file_read_error_message(int err)
{
  static char errmsg_errno[1024+1];

  snprintf(errmsg_errno, sizeof(errmsg_errno),
		  "An error occurred while reading from the file \"%%s\": %s.",
				wtap_strerror(err));
  return errmsg_errno;
}

char *
file_write_error_message(int err)
{
  char *errmsg;
  static char errmsg_errno[1024+1];

  switch (err) {

  case ENOSPC:
    errmsg = "The file \"%s\" could not be saved because there is no space left on the file system.";
    break;

#ifdef EDQUOT
  case EDQUOT:
    errmsg = "The file \"%s\" could not be saved because you are too close to, or over, your disk quota.";
    break;
#endif

  default:
    snprintf(errmsg_errno, sizeof(errmsg_errno),
		    "An error occurred while writing to the file \"%%s\": %s.",
				wtap_strerror(err));
    errmsg = errmsg_errno;
    break;
  }
  return errmsg;
}

/* Check for write errors - if the file is being written to an NFS server,
   a write error may not show up until the file is closed, as NFS clients
   might not send writes to the server until the "write()" call finishes,
   so that the write may fail on the server but the "write()" may succeed. */
static char *
file_close_error_message(int err)
{
  char *errmsg;
  static char errmsg_errno[1024+1];

  switch (err) {

  case WTAP_ERR_CANT_CLOSE:
    errmsg = "The file \"%s\" couldn't be closed for some unknown reason.";
    break;

  case WTAP_ERR_SHORT_WRITE:
    errmsg = "Not all the packets could be written to the file \"%s\".";
    break;

  case ENOSPC:
    errmsg = "The file \"%s\" could not be saved because there is no space left on the file system.";
    break;

#ifdef EDQUOT
  case EDQUOT:
    errmsg = "The file \"%s\" could not be saved because you are too close to, or over, your disk quota.";
    break;
#endif

  default:
    snprintf(errmsg_errno, sizeof(errmsg_errno),
		    "An error occurred while closing the file \"%%s\": %s.",
				wtap_strerror(err));
    errmsg = errmsg_errno;
    break;
  }
  return errmsg;
}


/* Copies a file in binary mode, for those operating systems that care about
 * such things.
 * Returns TRUE on success, FALSE on failure. If a failure, it also
 * displays a simple dialog window with the error message.
 */
static gboolean
copy_binary_file(char *from_filename, char *to_filename)
{
	int           from_fd, to_fd, nread, nwritten, err;
	guint8        pd[65536]; /* XXX - Hmm, 64K here, 64K in save_cap_file(),
				    perhaps we should make just one 64K buffer. */

      /* Copy the raw bytes of the file. */
      from_fd = open(from_filename, O_RDONLY | O_BINARY);
      if (from_fd < 0) {
      	err = errno;
	simple_dialog(ESD_TYPE_CRIT, NULL,
			file_open_error_message(err, TRUE, 0), from_filename);
	goto done;
      }

      /* Use open() instead of creat() so that we can pass the O_BINARY
         flag, which is relevant on Win32; it appears that "creat()"
	 may open the file in text mode, not binary mode, but we want
	 to copy the raw bytes of the file, so we need the output file
	 to be open in binary mode. */
      to_fd = open(to_filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
      if (to_fd < 0) {
      	err = errno;
	simple_dialog(ESD_TYPE_CRIT, NULL,
			file_open_error_message(err, TRUE, 0), to_filename);
	close(from_fd);
	goto done;
      }

      while ((nread = read(from_fd, pd, sizeof pd)) > 0) {
	nwritten = write(to_fd, pd, nread);
	if (nwritten < nread) {
	  if (nwritten < 0)
	    err = errno;
	  else
	    err = WTAP_ERR_SHORT_WRITE;
	  simple_dialog(ESD_TYPE_CRIT, NULL,
				file_write_error_message(err), to_filename);
	  close(from_fd);
	  close(to_fd);
	  goto done;
	}
      }
      if (nread < 0) {
      	err = errno;
	simple_dialog(ESD_TYPE_CRIT, NULL,
			file_read_error_message(err), from_filename);
	close(from_fd);
	close(to_fd);
	goto done;
      }
      close(from_fd);
      if (close(to_fd) < 0) {
      	err = errno;
	simple_dialog(ESD_TYPE_CRIT, NULL,
		file_close_error_message(err), to_filename);
	goto done;
      }

      return TRUE;

   done:
      return FALSE;
}