aboutsummaryrefslogtreecommitdiffstats
path: root/file.c
blob: e79b8e3aaa7e2cc46c89bdc90ed818a40efbfd2c (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
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
/* file.c
 * File I/O routines
 *
 * $Id$
 *
 * 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

#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 <ctype.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_STRERROR_H
#include "strerror.h"
#endif

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

#include "color.h"
#include "color_filters.h"
#include <epan/column.h>
#include <epan/packet.h>
#include "packet-range.h"
#include "print.h"
#include "file.h"
#include "fileset.h"
#include "util.h"
#include "merge.h"
#include "alert_box.h"
#include "simple_dialog.h"
#include "progress_dlg.h"
#include "ui_util.h"
#include <epan/prefs.h>
#include <epan/dfilter/dfilter.h>
#include <epan/conversation.h>
#include <epan/epan_dissect.h>
#include <epan/tap.h>
#include "tap_dfilter_dlg.h"
#include <epan/dissectors/packet-data.h>

/* Win32 needs the O_BINARY flag for open() */
#ifndef O_BINARY
#define O_BINARY	0
#endif

#ifdef HAVE_LIBPCAP
gboolean auto_scroll_live;
#endif

static guint32 firstsec, firstusec;
static guint32 prevsec, prevusec;
static guint32 cum_bytes = 0;

static void cf_reset_state(capture_file *cf);

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 gboolean match_protocol_tree(capture_file *cf, frame_data *fdata,
	void *criterion);
static void match_subtree_text(proto_node *node, gpointer data);
static gboolean match_summary_line(capture_file *cf, frame_data *fdata,
	void *criterion);
static gboolean match_ascii_and_unicode(capture_file *cf, frame_data *fdata,
	void *criterion);
static gboolean match_ascii(capture_file *cf, frame_data *fdata,
	void *criterion);
static gboolean match_unicode(capture_file *cf, frame_data *fdata,
	void *criterion);
static gboolean match_binary(capture_file *cf, frame_data *fdata,
	void *criterion);
static gboolean match_dfilter(capture_file *cf, frame_data *fdata,
	void *criterion);
static gboolean find_packet(capture_file *cf,
	gboolean (*match_function)(capture_file *, frame_data *, void *),
	void *criterion);

static void cf_open_failure_alert_box(const char *filename, int err,
				      gchar *err_info, gboolean for_writing,
				      int file_type);
static const char *file_rename_error_message(int err);
static void cf_write_failure_alert_box(const char *filename, int err);
static void cf_close_failure_alert_box(const char *filename, int err);
static   gboolean copy_binary_file(const char *from_filename, const 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


/* one callback for now, we could have a list later */
static cf_callback_t cf_cb = NULL;
static gpointer cf_cb_user_data = NULL;

void
cf_callback_invoke(int event, gpointer data)
{
    g_assert(cf_cb != NULL);
    cf_cb(event, data, cf_cb_user_data);
}


void
cf_callback_add(cf_callback_t func, gpointer user_data)
{
    /* More than one callback listener is currently not implemented,
       but should be easy to do. */
    g_assert(cf_cb == NULL);
    cf_cb = func;
    cf_cb_user_data = user_data;
}

void
cf_callback_remove(cf_callback_t func _U_)
{
    g_assert(cf_cb != NULL);
    cf_cb = NULL;
    cf_cb_user_data = NULL;
}


cf_status_t
cf_open(capture_file *cf, const char *fname, gboolean is_tempfile, int *err)
{
  wtap       *wth;
  gchar       *err_info;
  int         fd;
  struct stat cf_stat;


  wth = wtap_open_offline(fname, err, &err_info, 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. */
  cf_reset_state(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_datalen = 0;
  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->displayed_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;
  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);

  fileset_file_opened(fname);

  return CF_OK;

fail:
  cf_open_failure_alert_box(fname, *err, err_info, FALSE, 0);
  return CF_ERROR;
}


/*
 * Reset the state for the currently closed file, but don't do the
 * UI callbacks; this is for use in "cf_open()", where we don't
 * want the UI to go from "file open" to "file closed" back to
 * "file open", we want it to go from "old file open" to "new file
 * open and being read".
 */
static void
cf_reset_state(capture_file *cf)
{
  /* Die if we're in the middle of reading a file. */
  g_assert(cf->state != FILE_READ_IN_PROGRESS);

  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;
  cf_unselect_packet(cf);	/* nothing to select */
  cf->first_displayed = NULL;
  cf->last_displayed = NULL;

  /* No frame selected, no field in that frame selected. */
  cf->current_frame = NULL;
  cf->finfo_selected = NULL;

  /* Clear the packet list. */
  packet_list_freeze();
  packet_list_clear();
  packet_list_thaw();

  cf->f_datalen = 0;
  cf->f_len = 0;
  cf->count = 0;
  cf->esec  = 0;
  cf->eusec = 0;

  reset_tap_listeners();

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

  fileset_file_closed();
}

/* Reset everything to a pristine state */
void
cf_close(capture_file *cf)
{
  cf_reset_state(cf);

  cleanup_dissection();

  cf_callback_invoke(cf_cb_file_closed, cf);
}

cf_read_status_t
cf_read(capture_file *cf)
{
  int         err;
  gchar       *err_info;
  const gchar *name_ptr;
  const 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];
  int          progbar_nextstep;
  int          progbar_quantum;

  cum_bytes=0;

  reset_tap_listeners();
  tap_dfilter_dlg_update();

  cf_callback_invoke(cf_cb_file_read_start, cf);

  name_ptr = get_basename(cf->filename);

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

  packet_list_freeze();

  stop_flag = FALSE;
  g_get_current_time(&start_time);

  while ((wtap_read(cf->wth, &err, &err_info, &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 >= 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", name_ptr,
            &stop_flag, &start_time, prog_val);
        }
        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);
        }
        progbar_nextstep += progbar_quantum;
    }

    if (stop_flag) {
      /* Well, the user decided to abort the read.  Destroy the progress
         bar, close the capture file, and return CF_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 */
      packet_list_thaw();		/* undo our freeze */
      cf_close(cf);
      return CF_READ_ABORTED;
    }
    read_packet(cf, data_offset);
  }

  /* We're done reading the file; destroy the progress bar if it was created. */
  if (progbar != NULL)
    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;
  packet_list_thaw();

  cf_callback_invoke(cf_cb_file_read_finished, cf);

  /* 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)
    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:
      g_snprintf(errmsg_errno, sizeof(errmsg_errno),
               "The capture file has a packet with a network type that Ethereal doesn't support.\n(%s)",
               err_info);
      g_free(err_info);
      errmsg = errmsg_errno;
      break;

    case WTAP_ERR_CANT_READ:
      errmsg = "An attempt to read from the capture 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:
      g_snprintf(errmsg_errno, sizeof(errmsg_errno),
               "The capture file appears to be damaged or corrupt.\n(%s)",
               err_info);
      g_free(err_info);
      errmsg = errmsg_errno;
      break;

    default:
      g_snprintf(errmsg_errno, sizeof(errmsg_errno),
	       "An error occurred while reading the"
	       " capture file: %s.", wtap_strerror(err));
      errmsg = errmsg_errno;
      break;
    }
    g_snprintf(err_str, sizeof err_str, errmsg);
    simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, err_str);
    return CF_READ_ERROR;
  } else
    return CF_READ_OK;
}

#ifdef HAVE_LIBPCAP
cf_status_t
cf_start_tail(capture_file *cf, const char *fname, gboolean is_tempfile, int *err)
{
  cf_status_t cf_status;

  cf_status = cf_open(cf, fname, is_tempfile, err);
  return cf_status;
}

cf_read_status_t
cf_continue_tail(capture_file *cf, int to_read, int *err)
{
  long data_offset = 0;
  gchar *err_info;

  *err = 0;

  packet_list_freeze();

  while (to_read != 0 && (wtap_read(cf->wth, err, &err_info, &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--;
  }

  packet_list_thaw();

  /* XXX - this cheats and looks inside the packet list to find the final
     row number. */
  if (auto_scroll_live && cf->plist_end != NULL)
    packet_list_moveto_end();

  if (cf->state == FILE_READ_ABORTED) {
    /* Well, the user decided to exit Ethereal.  Return CF_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
       "cf_finish_tail()" will be called, and it will clean up
       and exit. */
    return CF_READ_ABORTED;
  } else if (*err != 0) {
    /* We got an error reading the capture file.
       XXX - pop up a dialog box? */
    return CF_READ_ERROR;
  } else
    return CF_READ_OK;
}

cf_read_status_t
cf_finish_tail(capture_file *cf, int *err)
{
  gchar *err_info;
  long data_offset;
  int         fd;
  struct stat cf_stat;


  if(cf->wth == NULL) {
    cf_close(cf);
    return CF_READ_ERROR;
  }

  packet_list_freeze();

  while ((wtap_read(cf->wth, err, &err_info, &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 CF_READ_ABORTED so our caller can do whatever
       is appropriate when that happens. */
    cf_close(cf);
    return CF_READ_ABORTED;
  }

  packet_list_thaw();
  if (auto_scroll_live && cf->plist_end != NULL)
    /* XXX - this cheats and looks inside the packet list to find the final
       row number. */
    packet_list_moveto_end();

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

  /* we have to update the f_len field */
  /* Find the size of the file. */
  fd = wtap_fd(cf->wth);
  if (fstat(fd, &cf_stat) >= 0) {
      cf->f_len = cf_stat.st_size;
  }

  /* 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);

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

const gchar *
cf_get_display_name(capture_file *cf)
{
  const gchar *displayname;

  /* Return a name to use in displays */
  if (!cf->is_tempfile) {
    /* Get the last component of the file name, and use that. */
    if (cf->filename){
      displayname = get_basename(cf->filename);
    } else {
      displayname="(No file)";
    }
  } else {
    /* The file we read is a temporary file from a live capture;
       we don't mention its name. */
    displayname = "(Untitled)";
  }
  return displayname;
}

/* XXX - use a macro instead? */
int
cf_packet_count(capture_file *cf)
{
    return cf->count;
}

/* XXX - use a macro instead? */
gboolean
cf_is_tempfile(capture_file *cf)
{
    return cf->is_tempfile;
}

void cf_set_tempfile(capture_file *cf, gboolean is_tempfile)
{
    cf->is_tempfile = is_tempfile;
}


/* XXX - use a macro instead? */
void cf_set_drops_known(capture_file *cf, gboolean drops_known)
{
    cf->drops_known = drops_known;
}

/* XXX - use a macro instead? */
void cf_set_drops(capture_file *cf, guint32 drops)
{
    cf->drops = drops;
}

/* XXX - use a macro instead? */
gboolean cf_get_drops_known(capture_file *cf)
{
    return cf->drops_known;
}

/* XXX - use a macro instead? */
guint32 cf_get_drops(capture_file *cf)
{
    return cf->drops;
}

void cf_set_rfcode(capture_file *cf, dfilter_t *rfcode)
{
    cf->rfcode = rfcode;
}

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

  /* just add some value here until we know if it is being displayed or not */
  fdata->cum_bytes  = cum_bytes + fdata->pkt_len;

  /* 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 this frames is marked as a reference time frame, reset
     firstsec and firstusec to this frame */
  if(fdata->flags.ref_time){
    firstsec  = fdata->abs_secs;
    firstusec = fdata->abs_usecs;
  }

  /* 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);

  /* If either

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

	we have a list of color filters;

	we have tap listeners;

     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) || color_filters_used()
        || num_tap_filters != 0)
	  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 (color_filters_used()) {
      color_filters_prime_edt(edt);
  }
  tap_queue_init(edt);
  epan_dissect_run(edt, pseudo_header, buf, fdata, &cf->cinfo);
  tap_push_tapped_queue(edt);

  /* 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) {
      fdata->flags.passed_dfilter = dfilter_apply_edt(cf->dfcode, edt) ? 1 : 0;
    }
  } else
    fdata->flags.passed_dfilter = 1;

  if( (fdata->flags.passed_dfilter) 
   || (edt->pi.fd->flags.ref_time) ){
    /* This frame either passed the display filter list or is marked as
       a time reference frame.  All time reference frames are displayed
       even if they dont pass the display filter */
    /* if this was a TIME REF frame we should reset the cul bytes field */
    if(edt->pi.fd->flags.ref_time){
      cum_bytes = fdata->pkt_len;
      fdata->cum_bytes  = cum_bytes;
    }

    /* increase cum_bytes with this packets length */
    cum_bytes += fdata->pkt_len;

    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,
       "cf_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
       "cf_select_packet()" can find this frame.  See the comment
       in "cf_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 = packet_list_append(cf->cinfo.col_data, fdata);

    /* colorize packet: if packet is marked, use preferences, 
       otherwise try to apply color filters */
      if (fdata->flags.marked) {
          fdata->color_filter = NULL;
          packet_list_set_colors(row, &prefs.gui_marked_fg, &prefs.gui_marked_bg);
      } else {
          fdata->color_filter = color_filters_colorize_packet(row, edt);
      }

    /* Set the time of the previous displayed frame to the time of this
       frame. */
    prevsec = fdata->abs_secs;
    prevusec = fdata->abs_usecs;

    cf->displayed_count++;
  } 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;
  fdata->flags.ref_time = 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++;
    cf->f_datalen = offset + phdr->caplen;
    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);
  }
}

cf_status_t
cf_merge_files(char **out_filenamep, int in_file_count,
               char *const *in_filenames, int file_type, gboolean do_append)
{
  merge_in_file_t  *in_files;
  wtap             *wth;
  char             *out_filename;
  char              tmpname[128+1];
  int               out_fd;
  wtap_dumper      *pdh;
  int               open_err, read_err, write_err, close_err;
  gchar            *err_info;
  int               err_fileno; 
  int               i;
  char              errmsg_errno[1024+1];
  gchar             err_str[2048+1];
  const char       *errmsg;
  gboolean          got_read_error = FALSE, got_write_error = FALSE;
  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        f_len, file_pos;
  float       prog_val;
  GTimeVal    start_time;
  gchar       status_str[100];
  int         progbar_nextstep;
  int         progbar_quantum;

  /* open the input files */
  if (!merge_open_in_files(in_file_count, in_filenames, &in_files,
                           &open_err, &err_info, &err_fileno)) {
    free(in_files);
    cf_open_failure_alert_box(in_filenames[err_fileno], open_err, err_info,
                              FALSE, 0);
    return CF_ERROR;
  }

  if (*out_filenamep != NULL) {
    out_filename = *out_filenamep;
    out_fd = open(out_filename, O_CREAT|O_TRUNC|O_BINARY, 0600);
    if (out_fd == -1)
      open_err = errno;
  } else {
    out_fd = create_tempfile(tmpname, sizeof tmpname, "ether");
    if (out_fd == -1)
      open_err = errno;
    out_filename = g_strdup(tmpname);
    *out_filenamep = out_filename;
  }
  if (out_fd == -1) {
    err_info = NULL;
    merge_close_in_files(in_file_count, in_files);
    free(in_files);
    cf_open_failure_alert_box(out_filename, open_err, NULL, TRUE, file_type);
    return CF_ERROR;
  }

  pdh = wtap_dump_fdopen(out_fd, file_type,
      merge_select_frame_type(in_file_count, in_files),
      merge_max_snapshot_length(in_file_count, in_files), &open_err);
  if (pdh == NULL) {
    close(out_fd);
    merge_close_in_files(in_file_count, in_files);
    free(in_files);
    cf_open_failure_alert_box(out_filename, open_err, err_info, TRUE,
                              file_type);
    return CF_ERROR;
  }

  /* Get the sum of the sizes of all the files. */
  f_len = 0;
  for (i = 0; i < in_file_count; i++)
    f_len += in_files[i].size;

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

  stop_flag = FALSE;
  g_get_current_time(&start_time);

  /* do the merge (or append) */
  for (;;) {
    if (do_append)
      wth = merge_append_read_packet(in_file_count, in_files, &read_err,
                                     &err_info);
    else
      wth = merge_read_packet(in_file_count, in_files, &read_err,
                              &err_info);
    if (wth == NULL) {
      if (read_err != 0)
        got_read_error = TRUE;
      break;
    }

    /* Get the sum of the data offsets in all of the files. */
    data_offset = 0;
    for (i = 0; i < in_file_count; i++)
      data_offset += in_files[i].data_offset;

    if (data_offset >= progbar_nextstep) {
        /* Get the sum of the seek positions in all of the files. */
        file_pos = 0;
        for (i = 0; i < in_file_count; i++)
          file_pos += lseek(wtap_fd(in_files[i].wth), 0, SEEK_CUR);
        prog_val = (gfloat) file_pos / (gfloat) f_len;
        if (prog_val > 1.0) {
          /* Some file probably grew while we were reading it.
             That "shouldn't happen", so we'll just clip the progress
             value at 1.0. */
          prog_val = 1.0;
        }
        if (progbar == NULL) {
          /* Create the progress bar if necessary */
          progbar = delayed_create_progress_dlg("Merging", "files",
            &stop_flag, &start_time, prog_val);
        }
        if (progbar != NULL) {
          g_snprintf(status_str, sizeof(status_str),
                     "%luKB of %luKB", file_pos / 1024, f_len / 1024);
          update_progress_dlg(progbar, prog_val, status_str);
        }
        progbar_nextstep += progbar_quantum;
    }

    if (!wtap_dump(pdh, wtap_phdr(wth), wtap_pseudoheader(wth),
         wtap_buf_ptr(wth), &write_err)) {
      got_write_error = TRUE;
      break;
    }
  }

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

  merge_close_in_files(in_file_count, in_files);
  if (!got_read_error && !got_write_error) {
    if (!wtap_dump_close(pdh, &write_err))
      got_write_error = TRUE;
  } else
    wtap_dump_close(pdh, &close_err);

  if (got_read_error) {
    /*
     * Find the file on which we got the error, and report the error.
     */
    for (i = 0; i < in_file_count; i++) {
      if (in_files[i].state == GOT_ERROR) {
	/* Put up a message box noting that a read failed somewhere along
	   the line. */
	switch (read_err) {

	case WTAP_ERR_UNSUPPORTED_ENCAP:
	  g_snprintf(errmsg_errno, sizeof(errmsg_errno),
		   "The capture file %%s has a packet with a network type that Ethereal doesn't support.\n(%s)",
		   err_info);
	  g_free(err_info);
	  errmsg = errmsg_errno;
	  break;

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

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

	case WTAP_ERR_BAD_RECORD:
	  g_snprintf(errmsg_errno, sizeof(errmsg_errno),
		   "The capture file %%s appears to be damaged or corrupt.\n(%s)",
		   err_info);
	  g_free(err_info);
	  errmsg = errmsg_errno;
	  break;

	default:
	  g_snprintf(errmsg_errno, sizeof(errmsg_errno),
		   "An error occurred while reading the"
		   " capture file %%s: %s.", wtap_strerror(read_err));
	  errmsg = errmsg_errno;
	  break;
	}
	g_snprintf(err_str, sizeof err_str, errmsg, in_files[i].filename);
        simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, err_str);
      }
    }
  }

  if (got_write_error) {
    /* Put up an alert box for the write error. */
    cf_write_failure_alert_box(out_filename, write_err);
  }

  return (!got_read_error && !got_write_error) ? CF_OK : CF_ERROR;
}

cf_status_t
cf_filter_packets(capture_file *cf, gchar *dftext, gboolean force)
{
  dfilter_t  *dfcode;
  const char *filter_new = dftext ? dftext : "";
  const char *filter_old = cf->dfilter ? cf->dfilter : "";

  /* if new filter equals old one, do nothing unless told to do so */
  if (!force && strcmp(filter_new, filter_old) == 0) {
    return CF_OK;
  }

  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. */
      gchar *safe_dftext = simple_dialog_format_message(dftext);
      gchar *safe_dfilter_error_msg = simple_dialog_format_message(
	  dfilter_error_msg);
      simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, 
          "%s%s%s\n"
          "\n"
          "The following display filter isn't a valid display filter:\n%s\n"
          "See the help for a description of the display filter syntax.",
          simple_dialog_primary_start(), safe_dfilter_error_msg,
          simple_dialog_primary_end(), safe_dftext);
      g_free(safe_dfilter_error_msg);
      g_free(safe_dftext);
      g_free(dftext);
      return CF_ERROR;
    }

    /* 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 CF_OK;
}

void
cf_colorize_packets(capture_file *cf)
{
  rescan_packets(cf, "Colorizing", "all packets", FALSE, FALSE);
}

void
cf_reftime_packets(capture_file *cf)
{
  rescan_packets(cf, "Updating Reftime", "all packets", FALSE, FALSE);
}

void
cf_redissect_packets(capture_file *cf)
{
  rescan_packets(cf, "Reprocessing", "all packets", 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;
  gchar      *err_info;
  frame_data *selected_frame, *preceding_frame, *following_frame, *prev_frame;
  int         selected_row, prev_row, preceding_row, following_row;
  gboolean    selected_frame_seen;
  int         row;
  float       prog_val;
  GTimeVal    start_time;
  gchar       status_str[100];
  int         progbar_nextstep;
  int         progbar_quantum;

  cum_bytes=0;
  reset_tap_listeners();
  /* 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. */
  packet_list_freeze();

  /* Clear it out. */
  packet_list_clear();

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

  /* We currently don't display any packets */
  cf->displayed_count = 0;

  /* 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. */
  progbar_nextstep = 0;
  /* When we reach the value that triggers a progress bar update,
     bump that value by this amount. */
  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);

  row = -1;		/* no previous row yet */
  prev_row = -1;
  prev_frame = NULL;

  preceding_row = -1;
  preceding_frame = NULL;
  following_row = -1;
  following_frame = NULL;

  selected_frame_seen = FALSE;

  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 >= 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_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);
      }

      progbar_nextstep += 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;
      }
    }

    if (!wtap_seek_read (cf->wth, fdata->file_off, &cf->pseudo_header,
    	cf->pd, fdata->cap_len, &err, &err_info)) {
	simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		      cf_read_error_message(err, err_info), cf->filename);
	break;
    }

    /* If the previous frame is displayed, and we haven't yet seen the
       selected frame, remember that frame - it's the closest one we've
       yet seen before the selected frame. */
    if (prev_row != -1 && !selected_frame_seen) {
      preceding_row = prev_row;
      preceding_frame = prev_frame;
    }
    row = add_packet_to_packet_list(fdata, cf, &cf->pseudo_header, cf->pd,
					refilter);

    /* If this frame is displayed, and this is the first frame we've
       seen displayed after the selected frame, remember this frame -
       it's the closest one we've yet seen at or after the selected
       frame. */
    if (row != -1 && selected_frame_seen && following_row == -1) {
      following_row = row;
      following_frame = fdata;
    }
    if (fdata == selected_frame) {
      selected_row = row;
      selected_frame_seen = TRUE;
    }

    /* Remember this row/frame - it'll be the previous row/frame
       on the next pass through the loop. */
    prev_row = row;
    prev_frame = fdata;
  }

  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. */
  packet_list_thaw();

  if (selected_row == -1) {
    /* The selected frame didn't pass the filter. */
    if (selected_frame == NULL) {
      /* That's because there *was* no selected frame.  Make the first
         displayed frame the current frame. */
      selected_row = 0;
    } else {
      /* Find the nearest displayed frame to the selected frame (whether
         it's before or after that frame) and make that the current frame.
         If the next and previous displayed frames are equidistant from the
         selected frame, choose the next one. */
      g_assert(following_frame == NULL ||
               following_frame->num >= selected_frame->num);
      g_assert(preceding_frame == NULL ||
               preceding_frame->num <= selected_frame->num);
      if (following_frame == NULL) {
        /* No frame after the selected frame passed the filter, so we
           have to select the last displayed frame before the selected
           frame. */
        selected_row = preceding_row;
      } else if (preceding_frame == NULL) {
        /* No frame before the selected frame passed the filter, so we
           have to select the first displayed frame after the selected
           frame. */
        selected_row = following_row;
      } else {
        /* Choose the closer of the last displayed frame before the
           selected frame and the first displayed frame after the
           selected frame; in case of a tie, choose the first displayed
           frame after the selected frame. */
        if (following_frame->num - selected_frame->num <=
            selected_frame->num - preceding_frame->num) {
          selected_row = following_row;
        } else {
          /* The previous frame is closer to the selected frame than the
             next frame. */
          selected_row = preceding_row;
        }
      }
    }
  }

  if (selected_row == -1) {
    /* There are no frames displayed at all. */
    cf_unselect_packet(cf);
  } else {
    /* Either the frame that was selected passed the filter, or we've
       found the nearest displayed frame to that frame.  Select it, make
       it the focus row, and make it visible. */
    packet_list_set_selected_row(selected_row);
  }
}

typedef enum {
  PSP_FINISHED,
  PSP_STOPPED,
  PSP_FAILED
} psp_return_t;

static psp_return_t
process_specified_packets(capture_file *cf, packet_range_t *range,
    const char *string1, const char *string2,
    gboolean (*callback)(capture_file *, frame_data *,
                         union wtap_pseudo_header *, const guint8 *, void *),
    void *callback_args)
{
  frame_data *fdata;
  int         err;
  gchar      *err_info;
  union wtap_pseudo_header pseudo_header;
  guint8      pd[WTAP_MAX_PACKET_SIZE+1];
  psp_return_t ret = PSP_FINISHED;

  progdlg_t  *progbar = NULL;
  int         progbar_count;
  float       progbar_val;
  gboolean    progbar_stop_flag;
  GTimeVal    progbar_start_time;
  gchar       progbar_status_str[100];
  int         progbar_nextstep;
  int         progbar_quantum;
  range_process_e process_this;

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

  progbar_stop_flag = FALSE;
  g_get_current_time(&progbar_start_time);

  packet_range_process_init(range);

  /* 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 (progbar_count >= 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);
      progbar_val = (gfloat) progbar_count / cf->count;

      if (progbar == NULL)
        /* Create the progress bar if necessary */
        progbar = delayed_create_progress_dlg(string1, string2,
                                              &progbar_stop_flag,
                                              &progbar_start_time,
                                              progbar_val);

      if (progbar != NULL) {
        g_snprintf(progbar_status_str, sizeof(progbar_status_str),
                   "%4u of %u packets", progbar_count, cf->count);
        update_progress_dlg(progbar, progbar_val, progbar_status_str);
      }

      progbar_nextstep += progbar_quantum;
    }

    if (progbar_stop_flag) {
      /* Well, the user decided to abort the operation.  Just stop,
         and arrange to return TRUE to our caller, so they know it
         was stopped explicitly. */
      ret = PSP_STOPPED;
      break;
    }

    progbar_count++;

    /* do we have to process this packet? */
    process_this = packet_range_process_packet(range, fdata);
    if (process_this == range_process_next) {
        /* this packet uninteresting, continue with next one */
        continue;
    } else if (process_this == range_processing_finished) {
        /* all interesting packets processed, stop the loop */
        break;
    }

    /* Get the packet */
    if (!wtap_seek_read(cf->wth, fdata->file_off, &pseudo_header,
                        pd, fdata->cap_len, &err, &err_info)) {
      /* Attempt to get the packet failed. */
      simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
                    cf_read_error_message(err, err_info), cf->filename);
      ret = PSP_FAILED;
      break;
    }
    /* Process the packet */
    if (!callback(cf, fdata, &pseudo_header, pd, callback_args)) {
      /* Callback failed.  We assume it reported the error appropriately. */
      ret = PSP_FAILED;
      break;
    }
  }

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

  return ret;
}

static gboolean
retap_packet(capture_file *cf _U_, frame_data *fdata,
             union wtap_pseudo_header *pseudo_header, const guint8 *pd,
             void *argsp _U_)
{
  epan_dissect_t *edt;

  /* If we have tap listeners, allocate a protocol tree root node, so that
     we'll construct a protocol tree against which a filter expression can
     be evaluated. */
  edt = epan_dissect_new(num_tap_filters != 0, FALSE);
  tap_queue_init(edt);
  epan_dissect_run(edt, pseudo_header, pd, fdata, NULL);
  tap_push_tapped_queue(edt);
  epan_dissect_free(edt);

  return TRUE;
}

cf_read_status_t
cf_retap_packets(capture_file *cf)
{
  packet_range_t range;

  /* Reset the tap listeners. */
  reset_tap_listeners();

  /* Iterate through the list of packets, dissecting all packets and
     re-running the taps. */
  packet_range_init(&range);
  packet_range_process_init(&range);
  switch (process_specified_packets(cf, &range, "Refiltering statistics on",
                                    "all packets", retap_packet,
                                    NULL)) {
  case PSP_FINISHED:
    /* Completed successfully. */
    return CF_OK;

  case PSP_STOPPED:
    /* Well, the user decided to abort the refiltering.
       Return CF_READ_ABORTED so our caller knows they did that. */
    return CF_READ_ABORTED;

  case PSP_FAILED:
    /* Error while retapping. */
    return CF_READ_ERROR;
  }

  g_assert_not_reached();
  return CF_READ_OK;
}

typedef struct {
  print_args_t *print_args;
  gboolean      print_header_line;
  char         *header_line_buf;
  int           header_line_buf_len;
  gboolean      print_formfeed;
  gboolean      print_separator;
  char         *line_buf;
  int           line_buf_len;
  gint         *col_widths;
} print_callback_args_t;

static gboolean
print_packet(capture_file *cf, frame_data *fdata,
             union wtap_pseudo_header *pseudo_header, const guint8 *pd,
             void *argsp)
{
  print_callback_args_t *args = argsp;
  epan_dissect_t *edt;
  int             i;
  char           *cp;
  int             line_len;
  int             column_len;
  int             cp_off;
  gboolean        proto_tree_needed;
  char            bookmark_name[9+10+1];	/* "__frameNNNNNNNNNN__\0" */
  char            bookmark_title[6+10+1];	/* "Frame NNNNNNNNNN__\0" */

  /* Create the protocol tree, and make it visible, if we're printing
     the dissection or the hex data.
     XXX - do we need it if we're just printing the hex data? */
  proto_tree_needed = 
      args->print_args->print_dissections != print_dissections_none || args->print_args->print_hex;
  edt = epan_dissect_new(proto_tree_needed, proto_tree_needed);

  /* Fill in the column information if we're printing the summary
     information. */
  if (args->print_args->print_summary) {
    epan_dissect_run(edt, pseudo_header, pd, fdata, &cf->cinfo);
    epan_dissect_fill_in_columns(edt);
  } else
    epan_dissect_run(edt, pseudo_header, pd, fdata, NULL);

  if (args->print_formfeed) {
    if (!new_page(args->print_args->stream))
      goto fail;
  } else {
      if (args->print_separator) {
        if (!print_line(args->print_args->stream, 0, ""))
          goto fail;
      }
  }

  /*
   * We generate bookmarks, if the output format supports them.
   * The name is "__frameN__".
   */
  g_snprintf(bookmark_name, sizeof bookmark_name, "__frame%u__", fdata->num);

  if (args->print_args->print_summary) {
    if (args->print_header_line) {
      if (!print_line(args->print_args->stream, 0, args->header_line_buf))
        goto fail;
      args->print_header_line = FALSE;	/* we might not need to print any more */
    }
    cp = &args->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 (args->col_widths[i] > column_len)
         column_len = args->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 > args->line_buf_len) {
        cp_off = cp - args->line_buf;
        args->line_buf_len = 2 * line_len;
        args->line_buf = g_realloc(args->line_buf, args->line_buf_len + 1);
        cp = args->line_buf + cp_off;
      }

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

    /*
     * Generate a bookmark, using the summary line as the title.
     */
    if (!print_bookmark(args->print_args->stream, bookmark_name,
                        args->line_buf))
      goto fail;

    if (!print_line(args->print_args->stream, 0, args->line_buf))
      goto fail;
  } else {
    /*
     * Generate a bookmark, using "Frame N" as the title, as we're not
     * printing the summary line.
     */
    g_snprintf(bookmark_title, sizeof bookmark_title, "Frame %u", fdata->num);
    if (!print_bookmark(args->print_args->stream, bookmark_name,
                        bookmark_title))
      goto fail;
  } /* if (print_summary) */

  if (args->print_args->print_dissections != print_dissections_none) {
    if (args->print_args->print_summary) {
      /* Separate the summary line from the tree with a blank line. */
      if (!print_line(args->print_args->stream, 0, ""))
        goto fail;
    }

    /* Print the information in that tree. */
    if (!proto_tree_print(args->print_args, edt, args->print_args->stream))
      goto fail;

    /* Print a blank line if we print anything after this (aka more than one packet). */
    args->print_separator = TRUE;

    /* Print a header line if we print any more packet summaries */
    args->print_header_line = TRUE;
  }

  if (args->print_args->print_hex) {
    /* Print the full packet data as hex. */
    if (!print_hex_data(args->print_args->stream, edt))
      goto fail;

    /* Print a blank line if we print anything after this (aka more than one packet). */
    args->print_separator = TRUE;

    /* Print a header line if we print any more packet summaries */
    args->print_header_line = TRUE;
  } /* if (args->print_args->print_dissections != print_dissections_none) */

  epan_dissect_free(edt);

  /* do we want to have a formfeed between each packet from now on? */
  if(args->print_args->print_formfeed) {
    args->print_formfeed = TRUE;
  }

  return TRUE;

fail:
  epan_dissect_free(edt);
  return FALSE;
}

cf_print_status_t
cf_print_packets(capture_file *cf, print_args_t *print_args)
{
  int         i;
  print_callback_args_t callback_args;
  gint        data_width;
  char        *cp;
  int         cp_off;
  int         column_len;
  int         line_len;
  psp_return_t ret;

  callback_args.print_args = print_args;
  callback_args.print_header_line = TRUE;
  callback_args.header_line_buf = NULL;
  callback_args.header_line_buf_len = 256;
  callback_args.print_formfeed = FALSE;
  callback_args.print_separator = FALSE;
  callback_args.line_buf = NULL;
  callback_args.line_buf_len = 256;
  callback_args.col_widths = NULL;

  if (!print_preamble(print_args->stream, cf->filename)) {
    destroy_print_stream(print_args->stream);
    return CF_PRINT_WRITE_ERROR;
  }

  if (print_args->print_summary) {
    /* We're printing packet summaries.  Allocate the header line buffer
       and get the column widths. */
    callback_args.header_line_buf = g_malloc(callback_args.header_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 construct
       a buffer with a line containing the column titles. */
    callback_args.col_widths = (gint *) g_malloc(sizeof(gint) * cf->cinfo.num_cols);
    cp = &callback_args.header_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)
        callback_args.col_widths[i] = 0;
      else {
        callback_args.col_widths[i] = strlen(cf->cinfo.col_title[i]);
        data_width = get_column_char_width(get_column_format(i));
        if (data_width > callback_args.col_widths[i])
          callback_args.col_widths[i] = data_width;
      }

      /* Find the length of the string for this column. */
      column_len = strlen(cf->cinfo.col_title[i]);
      if (callback_args.col_widths[i] > column_len)
        column_len = callback_args.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 > callback_args.header_line_buf_len) {
        cp_off = cp - callback_args.header_line_buf;
        callback_args.header_line_buf_len = 2 * line_len;
        callback_args.header_line_buf = g_realloc(callback_args.header_line_buf,
                                                  callback_args.header_line_buf_len + 1);
        cp = callback_args.header_line_buf + cp_off;
      }

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

    /* Now start out the main line buffer with the same length as the
       header line buffer. */
    callback_args.line_buf_len = callback_args.header_line_buf_len;
    callback_args.line_buf = g_malloc(callback_args.line_buf_len + 1);
  } /* if (print_summary) */

  /* Iterate through the list of packets, printing the packets we were
     told to print. */
  ret = process_specified_packets(cf, &print_args->range, "Printing",
                                  "selected packets", print_packet,
                                  &callback_args);

  if (callback_args.header_line_buf != NULL)
    g_free(callback_args.header_line_buf);
  if (callback_args.line_buf != NULL)
    g_free(callback_args.line_buf);
  if (callback_args.col_widths != NULL)
    g_free(callback_args.col_widths);

  switch (ret) {

  case PSP_FINISHED:
    /* Completed successfully. */
    break;

  case PSP_STOPPED:
    /* Well, the user decided to abort the printing.

       XXX - note that what got generated before they did that
       will get printed if 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;

  case PSP_FAILED:
    /* Error while printing.

       XXX - note that what got generated before they did that
       will get printed if 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. */
    destroy_print_stream(print_args->stream);
    return CF_PRINT_WRITE_ERROR;
  }

  if (!print_finale(print_args->stream)) {
    destroy_print_stream(print_args->stream);
    return CF_PRINT_WRITE_ERROR;
  }

  if (!destroy_print_stream(print_args->stream))
    return CF_PRINT_WRITE_ERROR;

  return CF_PRINT_OK;
}

static gboolean
write_pdml_packet(capture_file *cf _U_, frame_data *fdata,
                  union wtap_pseudo_header *pseudo_header, const guint8 *pd,
		  void *argsp)
{
  FILE *fh = argsp;
  epan_dissect_t *edt;

  /* Create the protocol tree, but don't fill in the column information. */
  edt = epan_dissect_new(TRUE, TRUE);
  epan_dissect_run(edt, pseudo_header, pd, fdata, NULL);

  /* Write out the information in that tree. */
  proto_tree_write_pdml(edt, fh);

  epan_dissect_free(edt);

  return !ferror(fh);
}

cf_print_status_t
cf_write_pdml_packets(capture_file *cf, print_args_t *print_args)
{
  FILE        *fh;
  psp_return_t ret;

  fh = fopen(print_args->file, "w");
  if (fh == NULL)
    return CF_PRINT_OPEN_ERROR;	/* attempt to open destination failed */

  write_pdml_preamble(fh);
  if (ferror(fh)) {
    fclose(fh);
    return CF_PRINT_WRITE_ERROR;
  }

  /* Iterate through the list of packets, printing the packets we were
     told to print. */
  ret = process_specified_packets(cf, &print_args->range, "Writing PDML",
                                  "selected packets", write_pdml_packet,
                                  fh);

  switch (ret) {

  case PSP_FINISHED:
    /* Completed successfully. */
    break;

  case PSP_STOPPED:
    /* Well, the user decided to abort the printing. */
    break;

  case PSP_FAILED:
    /* Error while printing. */
    fclose(fh);
    return CF_PRINT_WRITE_ERROR;
  }

  write_pdml_finale(fh);
  if (ferror(fh)) {
    fclose(fh);
    return CF_PRINT_WRITE_ERROR;
  }

  /* XXX - check for an error */
  fclose(fh);

  return CF_PRINT_OK;
}

static gboolean
write_psml_packet(capture_file *cf, frame_data *fdata,
                  union wtap_pseudo_header *pseudo_header, const guint8 *pd,
		  void *argsp)
{
  FILE *fh = argsp;
  epan_dissect_t *edt;

  /* Fill in the column information, but don't create the protocol tree. */
  edt = epan_dissect_new(FALSE, FALSE);
  epan_dissect_run(edt, pseudo_header, pd, fdata, &cf->cinfo);
  epan_dissect_fill_in_columns(edt);

  /* Write out the information in that tree. */
  proto_tree_write_psml(edt, fh);

  epan_dissect_free(edt);

  return !ferror(fh);
}

cf_print_status_t
cf_write_psml_packets(capture_file *cf, print_args_t *print_args)
{
  FILE        *fh;
  psp_return_t ret;

  fh = fopen(print_args->file, "w");
  if (fh == NULL)
    return CF_PRINT_OPEN_ERROR;	/* attempt to open destination failed */

  write_psml_preamble(fh);
  if (ferror(fh)) {
    fclose(fh);
    return CF_PRINT_WRITE_ERROR;
  }

  /* Iterate through the list of packets, printing the packets we were
     told to print. */
  ret = process_specified_packets(cf, &print_args->range, "Writing PSML",
                                  "selected packets", write_psml_packet,
                                  fh);

  switch (ret) {

  case PSP_FINISHED:
    /* Completed successfully. */
    break;

  case PSP_STOPPED:
    /* Well, the user decided to abort the printing. */
    break;

  case PSP_FAILED:
    /* Error while printing. */
    fclose(fh);
    return CF_PRINT_WRITE_ERROR;
  }

  write_psml_finale(fh);
  if (ferror(fh)) {
    fclose(fh);
    return CF_PRINT_WRITE_ERROR;
  }

  /* XXX - check for an error */
  fclose(fh);

  return CF_PRINT_OK;
}

static gboolean
write_csv_packet(capture_file *cf, frame_data *fdata,
                 union wtap_pseudo_header *pseudo_header, const guint8 *pd,
                 void *argsp)
{
  FILE *fh = argsp;
  epan_dissect_t *edt;

  /* Fill in the column information, but don't create the protocol tree. */
  edt = epan_dissect_new(FALSE, FALSE);
  epan_dissect_run(edt, pseudo_header, pd, fdata, &cf->cinfo);
  epan_dissect_fill_in_columns(edt);

  /* Write out the information in that tree. */
  proto_tree_write_csv(edt, fh);

  epan_dissect_free(edt);

  return !ferror(fh);
}

cf_print_status_t
cf_write_csv_packets(capture_file *cf, print_args_t *print_args)
{
  FILE        *fh;
  psp_return_t ret;

  fh = fopen(print_args->file, "w");
  if (fh == NULL)
    return CF_PRINT_OPEN_ERROR; /* attempt to open destination failed */

  write_csv_preamble(fh);
  if (ferror(fh)) {
    fclose(fh);
    return CF_PRINT_WRITE_ERROR;
  }

  /* Iterate through the list of packets, printing the packets we were
     told to print. */
  ret = process_specified_packets(cf, &print_args->range, "Writing CSV",
                                  "selected packets", write_csv_packet,
                                  fh);

  switch (ret) {

  case PSP_FINISHED:
    /* Completed successfully. */
    break;

  case PSP_STOPPED:
    /* Well, the user decided to abort the printing. */
    break;

  case PSP_FAILED:
    /* Error while printing. */
    fclose(fh);
    return CF_PRINT_WRITE_ERROR;
  }

  write_csv_finale(fh);
  if (ferror(fh)) {
    fclose(fh);
    return CF_PRINT_WRITE_ERROR;
  }

  /* XXX - check for an error */
  fclose(fh);

  return CF_PRINT_OK;
}

/* 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
cf_change_time_formats(capture_file *cf)
{
  frame_data *fdata;
  progdlg_t  *progbar = NULL;
  gboolean    stop_flag;
  int         count;
  int         row;
  int         i;
  float       prog_val;
  GTimeVal    start_time;
  gchar       status_str[100];
  int         progbar_nextstep;
  int         progbar_quantum;
  int         first, last;
  gboolean    sorted_by_frame_column;

  /* 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;
  }
  first = cf->cinfo.col_first[COL_CLS_TIME];
  g_assert(first >= 0);
  last = cf->cinfo.col_last[COL_CLS_TIME];

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

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

  /*  If the rows are currently sorted by the frame column then we know
   *  the row number of each packet: it's the row number of the previously
   *  displayed packet + 1.
   *
   *  Otherwise, if the display is sorted by a different column then we have
   *  to use the O(N) packet_list_find_row_from_data() (thus making the job
   *  of changing the time display format O(N**2)).
   *
   *  (XXX - In fact it's still O(N**2) because gtk_clist_set_text() takes
   *  the row number and walks that many elements down the clist to find
   *  the appropriate element.)
   */
  sorted_by_frame_column = FALSE;
  for (i = 0; i < cf->cinfo.num_cols; i++) {
    if (cf->cinfo.col_fmt[i] == COL_NUMBER)
    {
      sorted_by_frame_column = (i == packet_list_get_sort_column());
      break;
    }
  }

  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, row = -1; 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 >= 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_flag, &start_time, prog_val);

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

      progbar_nextstep += 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. */
    if (!sorted_by_frame_column) {
      /* This function is O(N), so we try to avoid using it... */
      row = packet_list_find_row_from_data(fdata);
    } else {
      /* ...which we do by maintaining a count of packets that are
         being displayed (i.e., that have passed the display filter),
         and using the current value of that count as the row number
         (which is why we can only do it when the display is sorted
         by the frame number). */
      if (fdata->flags.passed_dfilter)
	row++;
      else
	continue;
    }

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

      for (i = first; i <= last; 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);
          packet_list_set_text(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. */
  for (i = first; i <= last; i++) {
    if (cf->cinfo.fmt_matx[i][COL_CLS_TIME]) {
      packet_list_set_cls_time_width(i);
    }
  }

  /* Unfreeze the packet list. */
  packet_list_thaw();
}

typedef struct {
	const char	*string;
	size_t		string_len;
	capture_file	*cf;
	gboolean	frame_matched;
} match_data;

gboolean
cf_find_packet_protocol_tree(capture_file *cf, const char *string)
{
  match_data		mdata;

  mdata.string = string;
  mdata.string_len = strlen(string);
  return find_packet(cf, match_protocol_tree, &mdata);
}

static gboolean
match_protocol_tree(capture_file *cf, frame_data *fdata, void *criterion)
{
  match_data		*mdata = criterion;
  epan_dissect_t	*edt;

  /* Construct the protocol tree, including the displayed text */
  edt = epan_dissect_new(TRUE, TRUE);
  /* We don't need the column information */
  epan_dissect_run(edt, &cf->pseudo_header, cf->pd, fdata, NULL);

  /* Iterate through all the nodes, seeing if they have text that matches. */
  mdata->cf = cf;
  mdata->frame_matched = FALSE;
  proto_tree_children_foreach(edt->tree, match_subtree_text, mdata);
  epan_dissect_free(edt);
  return mdata->frame_matched;
}

static void
match_subtree_text(proto_node *node, gpointer data)
{
  match_data	*mdata = (match_data*) data;
  const gchar	*string = mdata->string;
  size_t	string_len = mdata->string_len;
  capture_file	*cf = mdata->cf;
  field_info	*fi = PITEM_FINFO(node);
  gchar		label_str[ITEM_LABEL_LENGTH];
  gchar		*label_ptr;
  size_t	label_len;
  guint32	i;
  guint8	c_char;
  size_t	c_match = 0;

  if (mdata->frame_matched) {
    /* We already had a match; don't bother doing any more work. */
    return;
  }

  /* Don't match invisible entries. */
  if (PROTO_ITEM_IS_HIDDEN(node))
    return;

  /* was a free format label produced? */
  if (fi->rep) {
    label_ptr = fi->rep->representation;
  } else {
    /* no, make a generic label */
    label_ptr = label_str;
    proto_item_fill_label(fi, label_str);
  }
    
  /* Does that label match? */
  label_len = strlen(label_ptr);
  for (i = 0; i < label_len; i++) {
    c_char = label_ptr[i];
    if (cf->case_type)
      c_char = toupper(c_char);
    if (c_char == string[c_match]) {
      c_match++;
      if (c_match == string_len) {
	/* No need to look further; we have a match */
	mdata->frame_matched = TRUE;
	return;
      }
    } else
      c_match = 0;
  }
  
  /* Recurse into the subtree, if it exists */
  if (node->first_child != NULL)
    proto_tree_children_foreach(node, match_subtree_text, mdata);
}

gboolean
cf_find_packet_summary_line(capture_file *cf, const char *string)
{
  match_data		mdata;

  mdata.string = string;
  mdata.string_len = strlen(string);
  return find_packet(cf, match_summary_line, &mdata);
}

static gboolean
match_summary_line(capture_file *cf, frame_data *fdata, void *criterion)
{
  match_data		*mdata = criterion;
  const gchar		*string = mdata->string;
  size_t		string_len = mdata->string_len;
  epan_dissect_t	*edt;
  const char		*info_column;
  size_t		info_column_len;
  gboolean		frame_matched = FALSE;
  gint			colx;
  guint32		i;
  guint8		c_char;
  size_t		c_match = 0;

  /* Don't bother constructing the protocol tree */
  edt = epan_dissect_new(FALSE, FALSE);
  /* Get the column information */
  epan_dissect_run(edt, &cf->pseudo_header, cf->pd, fdata, &cf->cinfo);

  /* Find the Info column */
  for (colx = 0; colx < cf->cinfo.num_cols; colx++) {
    if (cf->cinfo.fmt_matx[colx][COL_INFO]) {
      /* Found it.  See if we match. */
      info_column = edt->pi.cinfo->col_data[colx];
      info_column_len = strlen(info_column);
      for (i = 0; i < info_column_len; i++) {
	c_char = info_column[i];
	if (cf->case_type)
	  c_char = toupper(c_char);
	if (c_char == string[c_match]) {
	  c_match++;
	  if (c_match == string_len) {
	    frame_matched = TRUE;
	    break;
	  }
	} else
	  c_match = 0;
      }
      break;
    }
  }
  epan_dissect_free(edt);
  return frame_matched;
}

typedef struct {
	const guint8 *data;
	size_t data_len;
} cbs_t;	/* "Counted byte string" */

gboolean
cf_find_packet_data(capture_file *cf, const guint8 *string, size_t string_size)
{
  cbs_t info;

  info.data = string;
  info.data_len = string_size;

  /* String or hex search? */
  if (cf->string) {
    /* String search - what type of string? */
    switch (cf->scs_type) {

    case SCS_ASCII_AND_UNICODE:
      return find_packet(cf, match_ascii_and_unicode, &info);

    case SCS_ASCII:
      return find_packet(cf, match_ascii, &info);

    case SCS_UNICODE:
      return find_packet(cf, match_unicode, &info);

    default:
      g_assert_not_reached();
      return FALSE;
    }
  } else
    return find_packet(cf, match_binary, &info);
}

static gboolean
match_ascii_and_unicode(capture_file *cf, frame_data *fdata, void *criterion)
{
  cbs_t		*info = criterion;
  const char	*ascii_text = info->data;
  size_t	textlen = info->data_len;
  gboolean	frame_matched;
  guint32	buf_len;
  guint32	i;
  guint8	c_char;
  size_t	c_match = 0;

  frame_matched = FALSE;
  buf_len = fdata->pkt_len;
  for (i = 0; i < buf_len; i++) {
    c_char = cf->pd[i];
    if (cf->case_type)
      c_char = toupper(c_char);
    if (c_char != 0) {
      if (c_char == ascii_text[c_match]) {
	c_match++;
	if (c_match == textlen) {
	  frame_matched = TRUE;
	  break;
	}
      } else
	c_match = 0;
    }
  }
  return frame_matched;
}

static gboolean
match_ascii(capture_file *cf, frame_data *fdata, void *criterion)
{
  cbs_t		*info = criterion;
  const char	*ascii_text = info->data;
  size_t	textlen = info->data_len;
  gboolean	frame_matched;
  guint32	buf_len;
  guint32	i;
  guint8	c_char;
  size_t	c_match = 0;

  frame_matched = FALSE;
  buf_len = fdata->pkt_len;
  for (i = 0; i < buf_len; i++) {
    c_char = cf->pd[i];
    if (cf->case_type)
      c_char = toupper(c_char);
    if (c_char == ascii_text[c_match]) {
      c_match++;
      if (c_match == textlen) {
	frame_matched = TRUE;
	break;
      }
    } else
      c_match = 0;
  }
  return frame_matched;
}

static gboolean
match_unicode(capture_file *cf, frame_data *fdata, void *criterion)
{
  cbs_t		*info = criterion;
  const char	*ascii_text = info->data;
  size_t	textlen = info->data_len;
  gboolean	frame_matched;
  guint32	buf_len;
  guint32	i;
  guint8	c_char;
  size_t	c_match = 0;

  frame_matched = FALSE;
  buf_len = fdata->pkt_len;
  for (i = 0; i < buf_len; i++) {
    c_char = cf->pd[i];
    if (cf->case_type)
      c_char = toupper(c_char);
    if (c_char == ascii_text[c_match]) {
      c_match++;
      i++;
      if (c_match == textlen) {
	frame_matched = TRUE;
	break;
      }
    } else
      c_match = 0;
  }
  return frame_matched;
}

static gboolean
match_binary(capture_file *cf, frame_data *fdata, void *criterion)
{
  cbs_t		*info = criterion;
  const guint8	*binary_data = info->data;
  size_t	datalen = info->data_len;
  gboolean	frame_matched;
  guint32	buf_len;
  guint32	i;
  size_t	c_match = 0;

  frame_matched = FALSE;
  buf_len = fdata->pkt_len;
  for (i = 0; i < buf_len; i++) {
    if (cf->pd[i] == binary_data[c_match]) {
      c_match++;
      if (c_match == datalen) {
	frame_matched = TRUE;
	break;
      }
    } else
      c_match = 0;
  }
  return frame_matched;
}

gboolean
cf_find_packet_dfilter(capture_file *cf, dfilter_t *sfcode)
{
  return find_packet(cf, match_dfilter, sfcode);
}

static gboolean
match_dfilter(capture_file *cf, frame_data *fdata, void *criterion)
{
  dfilter_t		*sfcode = criterion;
  epan_dissect_t	*edt;
  gboolean		frame_matched;

  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);
  return frame_matched;
}

static gboolean
find_packet(capture_file *cf,
            gboolean (*match_function)(capture_file *, frame_data *, void *),
            void *criterion)
{
  frame_data *start_fd;
  frame_data *fdata;
  frame_data *new_fd = NULL;
  progdlg_t  *progbar = NULL;
  gboolean    stop_flag;
  int         count;
  int         err;
  gchar      *err_info;
  int         row;
  float       prog_val;
  GTimeVal    start_time;
  gchar       status_str[100];
  int         progbar_nextstep;
  int         progbar_quantum;

  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;

    progbar_nextstep = 0;
    /* When we reach the value that triggers a progress bar update,
       bump that value by this amount. */
    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 >= 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, 
             &stop_flag, &start_time, prog_val);

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

        progbar_nextstep += 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) {
          /*
           * XXX - other apps have a bit more of a detailed message
           * for this, and instead of offering "OK" and "Cancel",
           * they offer things such as "Continue" and "Cancel";
           * we need an API for popping up alert boxes with
           * {Verb} and "Cancel".
           */

          if (prefs.gui_find_wrap)
          {
              simple_dialog(ESD_TYPE_INFO, ESD_BTN_OK,
                            "%sBeginning of capture exceeded!%s\n\n"
                            "Search is continued from the end of the capture.",
                            simple_dialog_primary_start(), simple_dialog_primary_end());
              fdata = cf->plist_end;	/* wrap around */
          }
          else
          {
              simple_dialog(ESD_TYPE_INFO, ESD_BTN_OK,
                            "%sBeginning of capture exceeded!%s\n\n"
                            "Try searching forwards.",
                            simple_dialog_primary_start(), simple_dialog_primary_end());
              fdata = start_fd;        /* stay on previous packet */
          }
        }
      } else {
        /* Go on to the next frame. */
        fdata = fdata->next;
        if (fdata == NULL) {
          if (prefs.gui_find_wrap)
          {
              simple_dialog(ESD_TYPE_INFO, ESD_BTN_OK,
                            "%sEnd of capture exceeded!%s\n\n"
                            "Search is continued from the start of the capture.",
                            simple_dialog_primary_start(), simple_dialog_primary_end());
              fdata = cf->plist;	/* wrap around */
          }
          else
          {
              simple_dialog(ESD_TYPE_INFO, ESD_BTN_OK,
                            "%sEnd of capture exceeded!%s\n\n"
                            "Try searching backwards.",
                            simple_dialog_primary_start(), simple_dialog_primary_end());
              fdata = start_fd;     /* stay on previous packet */
          }
        }
      }

      count++;

      /* Is this packet in the display? */
      if (fdata->flags.passed_dfilter) {
      	/* Yes.  Load its data. */
        if (!wtap_seek_read(cf->wth, fdata->file_off, &cf->pseudo_header,
        		cf->pd, fdata->cap_len, &err, &err_info)) {
          /* Read error.  Report the error, and go back to the frame
             where we started. */
          simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
			cf_read_error_message(err, err_info), cf->filename);
          new_fd = start_fd;
          break;
        }

	/* Does it match the search criterion? */
	if ((*match_function)(cf, fdata, criterion)) {
          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 = packet_list_find_row_from_data(new_fd);
    g_assert(row != -1);

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

gboolean
cf_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) {
    /* we didn't find a packet with that packet number */
    simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
	 	  "There is no packet with the packet number %u.", fnumber);
    return FALSE;	/* we failed to go to that packet */
  }
  if (!fdata->flags.passed_dfilter) {
    /* that packet currently isn't displayed */
    /* XXX - add it to the set of displayed packets? */
    simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		  "The packet number %u isn't currently being displayed.", fnumber);
    return FALSE;	/* we failed to go to that packet */
  }

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

  /* Select that row, make it the focus row, and make it visible. */
  packet_list_set_selected_row(row);
  return TRUE;	/* we got to that packet */
}

gboolean
cf_goto_top_frame(capture_file *cf)
{
  frame_data *fdata;
  int row;
  frame_data *lowest_fdata = NULL;

  for (fdata = cf->plist; fdata != NULL; fdata = fdata->next) {
    if (fdata->flags.passed_dfilter) {
        lowest_fdata = fdata;
        break;
    }
  }

  if (lowest_fdata == NULL) {
      return FALSE;
  }

  /* We found that packet, and it's currently being displayed.
     Find what row it's in. */
  row = packet_list_find_row_from_data(lowest_fdata);
  g_assert(row != -1);

  /* Select that row, make it the focus row, and make it visible. */
  packet_list_set_selected_row(row);
  return TRUE;	/* we got to that packet */
}

gboolean
cf_goto_bottom_frame(capture_file *cf)
{
  frame_data *fdata;
  int row;
  frame_data *highest_fdata = NULL;

  for (fdata = cf->plist; fdata != NULL; fdata = fdata->next) {
    if (fdata->flags.passed_dfilter) {
        highest_fdata = fdata;
    }
  }

  if (highest_fdata == NULL) {
      return FALSE;
  }

  /* We found that packet, and it's currently being displayed.
     Find what row it's in. */
  row = packet_list_find_row_from_data(highest_fdata);
  g_assert(row != -1);

  /* Select that row, make it the focus row, and make it visible. */
  packet_list_set_selected_row(row);
  return TRUE;	/* we got to that packet */
}

/*
 * Go to frame specified by currently selected protocol tree item.
 */
gboolean
cf_goto_framenum(capture_file *cf)
{
  header_field_info       *hfinfo;
  guint32                 framenum;

  if (cf->finfo_selected) {
    hfinfo = cf->finfo_selected->hfinfo;
    g_assert(hfinfo);
    if (hfinfo->type == FT_FRAMENUM) {
      framenum = fvalue_get_integer(&cf->finfo_selected->value);
      if (framenum != 0)
        return cf_goto_frame(cf, framenum);
      }
  }

  return FALSE;
}

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

  /* Get the frame data struct pointer for this frame */
  fdata = (frame_data *)packet_list_get_row_data(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 "cf_select_packet()"
       to be called.

       "cf_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;
  }

  /* Get the data in that frame. */
  if (!wtap_seek_read (cf->wth, fdata->file_off, &cf->pseudo_header,
  		       cf->pd, fdata->cap_len, &err, &err_info)) {
    simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		  cf_read_error_message(err, err_info), cf->filename);
    return;
  }

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

  /* 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);

  cf_callback_invoke(cf_cb_packet_selected, cf);
}

/* Unselect the selected packet, if any. */
void
cf_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;
  }

  /* No packet is selected. */
  cf->current_frame = NULL;

  cf_callback_invoke(cf_cb_packet_unselected, cf);

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

/* Unset the selected protocol tree field, if any. */
void
cf_unselect_field(capture_file *cf)
{
  cf->finfo_selected = NULL;

  cf_callback_invoke(cf_cb_field_unselected, cf);
}

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

/*
 * Unmark a particular frame.
 */
void
cf_unmark_frame(capture_file *cf, frame_data *frame)
{
  if (frame->flags.marked) {
    frame->flags.marked = FALSE;
    if (cf->marked_count > 0)
      cf->marked_count--;
  }
}

typedef struct {
  wtap_dumper *pdh;
  const char  *fname;
} save_callback_args_t;

/*
 * 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.
 */
static gboolean
save_packet(capture_file *cf _U_, frame_data *fdata,
            union wtap_pseudo_header *pseudo_header, const guint8 *pd,
            void *argsp)
{
  save_callback_args_t *args = argsp;
  struct wtap_pkthdr hdr;
  int           err;

  /* init the wtap header for saving */
  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;

  /* and save the packet */
  if (!wtap_dump(args->pdh, &hdr, pseudo_header, pd, &err)) {
    cf_write_failure_alert_box(args->fname, err);
    return FALSE;
  }
  return TRUE;
}

cf_status_t
cf_save(capture_file *cf, const char *fname, packet_range_t *range, guint save_format)
{
  gchar        *from_filename;
  int           err;
  gboolean      do_copy;
  wtap_dumper  *pdh;
  save_callback_args_t callback_args;

  cf_callback_invoke(cf_cb_file_safe_started, fname);

  /* don't write over an existing file. */
  /* this should've been already checked by our caller, just to be sure... */
  if (file_exists(fname)) {
    simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
      "%sCapture file: \"%s\" already exists!%s\n\n"
      "Please choose a different filename.",
      simple_dialog_primary_start(), fname, simple_dialog_primary_end());
    goto fail;
  }

  packet_range_process_init(range);

  /* Used to be :
   * if (!save_filtered && !save_marked && !save_manual_range && 
   *     !save_marked_range && !save_curr && save_format == cf->cd_t) {
   */ 
	
  if (packet_range_process_all(range) && 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_ERROR, ESD_BTN_OK,
				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) {
      cf_open_failure_alert_box(fname, err, NULL, TRUE, save_format);
      goto fail;
    }

    /* XXX - we let the user save a subset of the packets.

       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? */

    /* Iterate through the list of packets, processing the packets we were
       told to process.

       XXX - we've already called "packet_range_process_init(range)", but
       "process_specified_packets()" will do it again.  Fortunately,
       that's harmless in this case, as we haven't done anything to
       "range" since we initialized it. */
    callback_args.pdh = pdh;
    callback_args.fname = fname;
    switch (process_specified_packets(cf, range, "Saving",
                                      "selected packets", save_packet,
                                      &callback_args)) {

    case PSP_FINISHED:
      /* Completed successfully. */
      break;

    case PSP_STOPPED:
      /* The user decided to abort the saving.
         XXX - remove the output file? */
      break;

    case PSP_FAILED:
      /* Error while saving. */
      wtap_dump_close(pdh, &err);
      goto fail;
    }

    if (!wtap_dump_close(pdh, &err)) {
      cf_close_failure_alert_box(fname, err);
      goto fail;
    }
  }

  cf_callback_invoke(cf_cb_file_safe_finished, NULL);

  if (packet_range_process_all(range)) {
    /* 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 ((cf_open(cf, fname, FALSE, &err)) == CF_OK) {
      /* XXX - report errors if this fails?
         What should we return if it fails or is aborted? */
      switch (cf_read(cf)) {

      case CF_READ_OK:
      case CF_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 CF_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; "cf_close()" set them
	   correctly for the "no capture file open" state). */
	break;
      }
      cf_callback_invoke(cf_cb_file_safe_reload_finished, NULL);
    }
  }
  return CF_OK;

fail:
  cf_callback_invoke(cf_cb_file_safe_failed, NULL);
  return CF_ERROR;
}

static void
cf_open_failure_alert_box(const char *filename, int err, gchar *err_info,
                          gboolean for_writing, int file_type)
{
  if (err < 0) {
    /* Wiretap error. */
    switch (err) {

    case WTAP_ERR_NOT_REGULAR_FILE:
      simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		    "The file \"%s\" is a \"special file\" or socket or other non-regular file.",
		    filename);
      break;

    case WTAP_ERR_RANDOM_OPEN_PIPE:
      /* Seen only when opening a capture file for reading. */
      simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		    "The file \"%s\" is a pipe or FIFO; Ethereal can't read pipe or FIFO files.",
		    filename);
      break;

    case WTAP_ERR_FILE_UNKNOWN_FORMAT:
      /* Seen only when opening a capture file for reading. */
      simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		    "The file \"%s\" isn't a capture file in a format Ethereal understands.",
		    filename);
      break;

    case WTAP_ERR_UNSUPPORTED:
      /* Seen only when opening a capture file for reading. */
      simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		    "The file \"%s\" isn't a capture file in a format Ethereal understands.\n"
		    "(%s)",
		    filename, err_info);
      g_free(err_info);
      break;

    case WTAP_ERR_CANT_WRITE_TO_PIPE:
      /* Seen only when opening a capture file for writing. */
      simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		    "The file \"%s\" is a pipe, and %s capture files can't be "
		    "written to a pipe.",
		    filename, wtap_file_type_string(file_type));
      break;

    case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
      /* Seen only when opening a capture file for writing. */
      simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		    "Ethereal doesn't support writing capture files in that format.");
      break;

    case WTAP_ERR_UNSUPPORTED_ENCAP:
      if (for_writing) {
	simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		      "Ethereal can't save this capture in that format.");
      } else {
	simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		      "The file \"%s\" is a capture for a network type that Ethereal doesn't support.\n"
		      "(%s)",
		      filename, err_info);
        g_free(err_info);
      }
      break;

    case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
      if (for_writing) {
	simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		      "Ethereal can't save this capture in that format.");
      } else {
	simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		      "The file \"%s\" is a capture for a network type that Ethereal doesn't support.",
		      filename);
      }
      break;

    case WTAP_ERR_BAD_RECORD:
      /* Seen only when opening a capture file for reading. */
      simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		    "The file \"%s\" appears to be damaged or corrupt.\n"
		    "(%s)",
		    filename, err_info);
      g_free(err_info);
      break;

    case WTAP_ERR_CANT_OPEN:
      if (for_writing) {
	simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		      "The file \"%s\" could not be created for some unknown reason.",
		      filename);
      } else {
	simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		      "The file \"%s\" could not be opened for some unknown reason.",
		      filename);
      }
      break;

    case WTAP_ERR_SHORT_READ:
      simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		    "The file \"%s\" appears to have been cut short"
		    " in the middle of a packet or other data.",
		    filename);
      break;

    case WTAP_ERR_SHORT_WRITE:
      simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		    "A full header couldn't be written to the file \"%s\".",
		    filename);
      break;

    default:
      simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		    "The file \"%s\" could not be %s: %s.",
		    filename,
		    for_writing ? "created" : "opened",
		    wtap_strerror(err));
      break;
    }
  } else {
    /* OS error. */
    open_failure_alert_box(filename, err, for_writing);
  }
}

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

  switch (err) {

  case ENOENT:
    errmsg = "The path to the file \"%s\" doesn't exist.";
    break;

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

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

char *
cf_read_error_message(int err, const gchar *err_info)
{
  static char errmsg_errno[1024+1];

  switch (err) {

  case WTAP_ERR_UNSUPPORTED_ENCAP:
      g_snprintf(errmsg_errno, sizeof(errmsg_errno),
               "The file \"%%s\" has a packet with a network type that Ethereal doesn't support.\n(%s)",
               err_info);
      break;

  case WTAP_ERR_BAD_RECORD:
    g_snprintf(errmsg_errno, sizeof(errmsg_errno),
	     "An error occurred while reading from the file \"%%s\": %s.\n(%s)",
	     wtap_strerror(err), err_info);
    break;

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

static void
cf_write_failure_alert_box(const char *filename, int err)
{
  if (err < 0) {
    /* Wiretap error. */
    simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		  "An error occurred while writing to the file \"%s\": %s.",
		  filename, wtap_strerror(err));
  } else {
    /* OS error. */
    write_failure_alert_box(filename, err);
  }
}

/* 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 void
cf_close_failure_alert_box(const char *filename, int err)
{
  if (err < 0) {
    /* Wiretap error. */
    switch (err) {

    case WTAP_ERR_CANT_CLOSE:
      simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		    "The file \"%s\" couldn't be closed for some unknown reason.",
		    filename);
      break;

    case WTAP_ERR_SHORT_WRITE:
      simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		    "Not all the packets could be written to the file \"%s\".",
                    filename);
      break;

    default:
      simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		    "An error occurred while closing the file \"%s\": %s.",
		    filename, wtap_strerror(err));
      break;
    }
  } else {
    /* OS error.
       We assume that a close error from the OS is really a write error. */
    write_failure_alert_box(filename, err);
  }
}

/* Reload the current capture file. */
void
cf_reload(capture_file *cf) {
  gchar *filename;
  gboolean is_tempfile;
  int err;

  /* If the file could be opened, "cf_open()" calls "cf_close()"
     to get rid of state for the old capture file before filling in state
     for the new capture file.  "cf_close()" will remove the file if
     it's a temporary file; we don't want that to happen (for one thing,
     it'd prevent subsequent reopens from working).  Remember whether it's
     a temporary file, mark it as not being a temporary file, and then
     reopen it as the type of file it was.

     Also, "cf_close()" will free "cf->filename", so we must make
     a copy of it first. */
  filename = g_strdup(cf->filename);
  is_tempfile = cf->is_tempfile;
  cf->is_tempfile = FALSE;
  if (cf_open(cf, filename, is_tempfile, &err) == CF_OK) {
    switch (cf_read(cf)) {

    case CF_READ_OK:
    case CF_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 CF_READ_ABORTED:
      /* The user bailed out of re-reading the capture file; the
         capture file has been closed - just free the capture file name
         string and return (without changing the last containing
         directory). */
      g_free(filename);
      return;
    }
  } else {
    /* The open failed, so "cf->is_tempfile" wasn't set to "is_tempfile".
       Instead, the file was left open, so we should restore "cf->is_tempfile"
       ourselves.

       XXX - change the menu?  Presumably "cf_open()" will do that;
       make sure it does! */
    cf->is_tempfile = is_tempfile;
  }
  /* "cf_open()" made a copy of the file name we handed it, so
     we should free up our copy. */
  g_free(filename);
}

/* 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(const char *from_filename, const char *to_filename)
{
  int           from_fd, to_fd, nread, nwritten, err;
  guint8        pd[65536];

  /* Copy the raw bytes of the file. */
  from_fd = open(from_filename, O_RDONLY | O_BINARY);
  if (from_fd < 0) {
    open_failure_alert_box(from_filename, errno, FALSE);
    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) {
    open_failure_alert_box(to_filename, errno, TRUE);
    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;
      write_failure_alert_box(to_filename, err);
      close(from_fd);
      close(to_fd);
      goto done;
    }
  }
  if (nread < 0) {
    err = errno;
    simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
		  "An error occurred while reading from the file \"%s\": %s.",
		  from_filename, strerror(err));
    close(from_fd);
    close(to_fd);
    goto done;
  }
  close(from_fd);
  if (close(to_fd) < 0) {
    write_failure_alert_box(to_filename, errno);
    goto done;
  }

  return TRUE;

done:
  return FALSE;
}