aboutsummaryrefslogtreecommitdiff
path: root/gunzip.c
blob: b29bdf7c124d69878fab4eea3dd31e3aae426520 (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
/* vi: set sw=4 ts=4: */
/*
 * Gzip implementation for busybox
 *
 * Based on GNU gzip Copyright (C) 1992-1993 Jean-loup Gailly.
 *
 * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
 * based on gzip sources
 *
 * Adjusted further by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
 * to support files as well as stdin/stdout, and to generally behave itself wrt
 * command line handling.
 *
 * 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
 *
 */

#include "internal.h"
#include <getopt.h>

/* These defines are very important for BusyBox.  Without these,
 * huge chunks of ram are pre-allocated making the BusyBox bss 
 * size Freaking Huge(tm), which is a bad thing.*/
#define SMALL_MEM
#define DYN_ALLOC

#define BB_DECLARE_EXTERN
#define bb_need_memory_exhausted
#define bb_need_name_too_long
#include "messages.c"


/* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
 * Copyright (C) 1992-1993 Jean-loup Gailly
 * The unzip code was written and put in the public domain by Mark Adler.
 * Portions of the lzw code are derived from the public domain 'compress'
 * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
 * Ken Turkowski, Dave Mack and Peter Jannesen.
 *
 * See the license_msg below and the file COPYING for the software license.
 * See the file algorithm.doc for the compression algorithms and file formats.
 */

#if 0
static char *license_msg[] = {
	"   Copyright (C) 1992-1993 Jean-loup Gailly",
	"   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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.",
	0
};
#endif

/* Compress files with zip algorithm and 'compress' interface.
 * See usage() and help() functions below for all options.
 * Outputs:
 *        file.gz:   compressed file with same mode, owner, and utimes
 *     or stdout with -c option or if stdin used as input.
 * If the output file name had to be truncated, the original name is kept
 * in the compressed file.
 * On MSDOS, file.tmp -> file.tmz. On VMS, file.tmp -> file.tmp-gz.
 *
 * Using gz on MSDOS would create too many file name conflicts. For
 * example, foo.txt -> foo.tgz (.tgz must be reserved as shorthand for
 * tar.gz). Similarly, foo.dir and foo.doc would both be mapped to foo.dgz.
 * I also considered 12345678.txt -> 12345txt.gz but this truncates the name
 * too heavily. There is no ideal solution given the MSDOS 8+3 limitation. 
 *
 * For the meaning of all compilation flags, see comments in Makefile.in.
 */

#include <ctype.h>
#include <sys/types.h>
#include <signal.h>
#include <sys/stat.h>
#include <errno.h>

/* #include "tailor.h" */

/* tailor.h -- target dependent definitions
 * Copyright (C) 1992-1993 Jean-loup Gailly.
 * This is free software; you can redistribute it and/or modify it under the
 * terms of the GNU General Public License, see the file COPYING.
 */

/* The target dependent definitions should be defined here only.
 * The target dependent functions should be defined in tailor.c.
 */

#define RECORD_IO 0

#define get_char() get_byte()
#define put_char(c) put_byte(c)


/* I don't like nested includes, but the string and io functions are used
 * too often
 */
#include <stdio.h>
#if !defined(NO_STRING_H) || defined(STDC_HEADERS)
#  include <string.h>
#  if !defined(STDC_HEADERS) && !defined(NO_MEMORY_H) && !defined(__GNUC__)
#    include <memory.h>
#  endif
#  define memzero(s, n)     memset ((void *)(s), 0, (n))
#else
#  include <strings.h>
#  define strchr            index
#  define strrchr           rindex
#  define memcpy(d, s, n)   bcopy((s), (d), (n))
#  define memcmp(s1, s2, n) bcmp((s1), (s2), (n))
#  define memzero(s, n)     bzero((s), (n))
#endif

#ifndef RETSIGTYPE
#  define RETSIGTYPE void
#endif

#define local static

typedef unsigned char uch;
typedef unsigned short ush;
typedef unsigned long ulg;

/* Return codes from gzip */
#define OK      0
#define ERROR   1
#define WARNING 2

/* Compression methods (see algorithm.doc) */
#define DEFLATED    8

extern int method;				/* compression method */

/* To save memory for 16 bit systems, some arrays are overlaid between
 * the various modules:
 * deflate:  prev+head   window      d_buf  l_buf  outbuf
 * unlzw:    tab_prefix  tab_suffix  stack  inbuf  outbuf
 * inflate:              window             inbuf
 * unpack:               window             inbuf  prefix_len
 * unlzh:    left+right  window      c_table inbuf c_len
 * For compression, input is done in window[]. For decompression, output
 * is done in window except for unlzw.
 */

#ifndef	INBUFSIZ
#  ifdef SMALL_MEM
#    define INBUFSIZ  0x2000	/* input buffer size */
#  else
#    define INBUFSIZ  0x8000	/* input buffer size */
#  endif
#endif
#define INBUF_EXTRA  64			/* required by unlzw() */

#ifndef	OUTBUFSIZ
#  ifdef SMALL_MEM
#    define OUTBUFSIZ   8192	/* output buffer size */
#  else
#    define OUTBUFSIZ  16384	/* output buffer size */
#  endif
#endif
#define OUTBUF_EXTRA 2048		/* required by unlzw() */

#define SMALL_MEM

#ifndef DIST_BUFSIZE
#  ifdef SMALL_MEM
#    define DIST_BUFSIZE 0x2000	/* buffer for distances, see trees.c */
#  else
#    define DIST_BUFSIZE 0x8000	/* buffer for distances, see trees.c */
#  endif
#endif

/*#define DYN_ALLOC*/

#ifdef DYN_ALLOC
#  define EXTERN(type, array)  extern type * array
#  define DECLARE(type, array, size)  type * array
#  define ALLOC(type, array, size) { \
      array = (type*)calloc((size_t)(((size)+1L)/2), 2*sizeof(type)); \
      if (array == NULL) errorMsg(memory_exhausted); \
   }
#  define FREE(array) {if (array != NULL) free(array), array=NULL;}
#else
#  define EXTERN(type, array)  extern type array[]
#  define DECLARE(type, array, size)  type array[size]
#  define ALLOC(type, array, size)
#  define FREE(array)
#endif

EXTERN(uch, inbuf);				/* input buffer */
EXTERN(uch, outbuf);			/* output buffer */
EXTERN(ush, d_buf);				/* buffer for distances, see trees.c */
EXTERN(uch, window);			/* Sliding window and suffix table (unlzw) */
#define tab_suffix window
#ifndef MAXSEG_64K
#  define tab_prefix prev		/* hash link (see deflate.c) */
#  define head (prev+WSIZE)		/* hash head (see deflate.c) */
EXTERN(ush, tab_prefix);		/* prefix code (see unlzw.c) */
#else
#  define tab_prefix0 prev
#  define head tab_prefix1
EXTERN(ush, tab_prefix0);		/* prefix for even codes */
EXTERN(ush, tab_prefix1);		/* prefix for odd  codes */
#endif

extern unsigned insize;			/* valid bytes in inbuf */
extern unsigned inptr;			/* index of next byte to be processed in inbuf */
extern unsigned outcnt;			/* bytes in output buffer */

extern long bytes_in;			/* number of input bytes */
extern long bytes_out;			/* number of output bytes */
extern long header_bytes;		/* number of bytes in gzip header */

extern long ifile_size;			/* input file size, -1 for devices (debug only) */

typedef int file_t;				/* Do not use stdio */

#define NO_FILE  (-1)			/* in memory compression */


#define	GZIP_MAGIC     "\037\213"	/* Magic header for gzip files, 1F 8B */

/* gzip flag byte */
#define ASCII_FLAG   0x01		/* bit 0 set: file probably ascii text */
#define CONTINUATION 0x02		/* bit 1 set: continuation of multi-part gzip file */
#define EXTRA_FIELD  0x04		/* bit 2 set: extra field present */
#define ORIG_NAME    0x08		/* bit 3 set: original file name present */
#define COMMENT      0x10		/* bit 4 set: file comment present */
#define ENCRYPTED    0x20		/* bit 5 set: file is encrypted */
#define RESERVED     0xC0		/* bit 6,7:   reserved */

#ifndef WSIZE
#  define WSIZE 0x8000			/* window size--must be a power of two, and */
#endif							/*  at least 32K for zip's deflate method */

#define MIN_MATCH  3
#define MAX_MATCH  258
/* The minimum and maximum match lengths */

#define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
/* Minimum amount of lookahead, except at the end of the input file.
 * See deflate.c for comments about the MIN_MATCH+1.
 */

#define MAX_DIST  (WSIZE-MIN_LOOKAHEAD)
/* In order to simplify the code, particularly on 16 bit machines, match
 * distances are limited to MAX_DIST instead of WSIZE.
 */

extern int exit_code;			/* program exit code */
extern int verbose;				/* be verbose (-v) */
extern int level;				/* compression level */
extern int test;				/* check .z file integrity */
extern int save_orig_name;		/* set if original name must be saved */

#define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf(0))
#define try_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf(1))

/* put_byte is used for the compressed output, put_ubyte for the
 * uncompressed output. However unlzw() uses window for its
 * suffix table instead of its output buffer, so it does not use put_ubyte
 * (to be cleaned up).
 */
#define put_byte(c) {outbuf[outcnt++]=(uch)(c); if (outcnt==OUTBUFSIZ)\
   flush_outbuf();}
#define put_ubyte(c) {window[outcnt++]=(uch)(c); if (outcnt==WSIZE)\
   flush_window();}

/* Output a 16 bit value, lsb first */
#define put_short(w) \
{ if (outcnt < OUTBUFSIZ-2) { \
    outbuf[outcnt++] = (uch) ((w) & 0xff); \
    outbuf[outcnt++] = (uch) ((ush)(w) >> 8); \
  } else { \
    put_byte((uch)((w) & 0xff)); \
    put_byte((uch)((ush)(w) >> 8)); \
  } \
}

/* Output a 32 bit value to the bit stream, lsb first */
#define put_long(n) { \
    put_short((n) & 0xffff); \
    put_short(((ulg)(n)) >> 16); \
}

#define seekable()    0			/* force sequential output */
#define translate_eol 0			/* no option -a yet */

#define tolow(c)  (isupper(c) ? (c)-'A'+'a' : (c))	/* force to lower case */

/* Macros for getting two-byte and four-byte header values */
#define SH(p) ((ush)(uch)((p)[0]) | ((ush)(uch)((p)[1]) << 8))
#define LG(p) ((ulg)(SH(p)) | ((ulg)(SH((p)+2)) << 16))

/* Diagnostic functions */
#ifdef DEBUG
#  define Assert(cond,msg) {if(!(cond)) errorMsg(msg);}
#  define Trace(x) fprintf x
#  define Tracev(x) {if (verbose) fprintf x ;}
#  define Tracevv(x) {if (verbose>1) fprintf x ;}
#  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
#  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
#else
#  define Assert(cond,msg)
#  define Trace(x)
#  define Tracev(x)
#  define Tracevv(x)
#  define Tracec(c,x)
#  define Tracecv(c,x)
#endif

#define WARN(msg) {fprintf msg ; \
		   if (exit_code == OK) exit_code = WARNING;}

	/* in unzip.c */
extern int unzip (int in, int out);

	/* in gzip.c */
RETSIGTYPE abort_gzip (void);

		/* in deflate.c */
void lm_init (int pack_level, ush * flags);
ulg deflate (void);

		/* in trees.c */
void ct_init (ush * attr, int *method);
int ct_tally (int dist, int lc);
ulg flush_block (char *buf, ulg stored_len, int eof);

		/* in bits.c */
void bi_init (file_t zipfile);
void send_bits (int value, int length);
unsigned bi_reverse (unsigned value, int length);
void bi_windup (void);
void copy_block (char *buf, unsigned len, int header);

	/* in util.c: */
extern ulg updcrc (uch * s, unsigned n);
extern void clear_bufs (void);
static int fill_inbuf (int eof_ok);
extern void flush_outbuf (void);
static void flush_window (void);
extern void write_buf (int fd, void * buf, unsigned cnt);

#ifndef __linux__
static char *basename (char *fname);
#endif							/* not __linux__ */
void read_error_msg (void);
void write_error_msg (void);

	/* in inflate.c */
static int inflate (void);

/* #include "lzw.h" */

/* lzw.h -- define the lzw functions.
 * Copyright (C) 1992-1993 Jean-loup Gailly.
 * This is free software; you can redistribute it and/or modify it under the
 * terms of the GNU General Public License, see the file COPYING.
 */

#if !defined(OF) && defined(lint)
#  include "gzip.h"
#endif

#ifndef BITS
#  define BITS 16
#endif
#define INIT_BITS 9				/* Initial number of bits per code */

#define	LZW_MAGIC  "\037\235"	/* Magic header for lzw files, 1F 9D */

#define BIT_MASK    0x1f		/* Mask for 'number of compression bits' */
/* Mask 0x20 is reserved to mean a fourth header byte, and 0x40 is free.
 * It's a pity that old uncompress does not check bit 0x20. That makes
 * extension of the format actually undesirable because old compress
 * would just crash on the new format instead of giving a meaningful
 * error message. It does check the number of bits, but it's more
 * helpful to say "unsupported format, get a new version" than
 * "can only handle 16 bits".
 */

#define BLOCK_MODE  0x80
/* Block compression: if table is full and compression rate is dropping,
 * clear the dictionary.
 */

#define LZW_RESERVED 0x60		/* reserved bits */

#define	CLEAR  256				/* flush the dictionary */
#define FIRST  (CLEAR+1)		/* first free entry */

extern int maxbits;				/* max bits per code for LZW */
extern int block_mode;			/* block compress mode -C compatible with 2.0 */

extern int lzw (int in, int out);
extern int unlzw (int in, int out);


/* #include "revision.h" */

/* revision.h -- define the version number
 * Copyright (C) 1992-1993 Jean-loup Gailly.
 * This is free software; you can redistribute it and/or modify it under the
 * terms of the GNU General Public License, see the file COPYING.
 */

#define VERSION "1.2.4"
#define PATCHLEVEL 0
#define REVDATE "18 Aug 93"

/* This version does not support compression into old compress format: */
#ifdef LZW
#  undef LZW
#endif

#include <time.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#if defined(DIRENT)
#  include <dirent.h>
typedef struct dirent dir_type;

#  define NLENGTH(dirent) ((int)strlen((dirent)->d_name))
#  define DIR_OPT "DIRENT"
#else
#  define NLENGTH(dirent) ((dirent)->d_namlen)
#  ifdef SYSDIR
#    include <sys/dir.h>
typedef struct direct dir_type;

#    define DIR_OPT "SYSDIR"
#  else
#    ifdef SYSNDIR
#      include <sys/ndir.h>
typedef struct direct dir_type;

#      define DIR_OPT "SYSNDIR"
#    else
#      ifdef NDIR
#        include <ndir.h>
typedef struct direct dir_type;

#        define DIR_OPT "NDIR"
#      else
#        define NO_DIR
#        define DIR_OPT "NO_DIR"
#      endif
#    endif
#  endif
#endif
#if !defined(S_ISDIR) && defined(S_IFDIR)
#  define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif
#if !defined(S_ISREG) && defined(S_IFREG)
#  define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
#endif
typedef RETSIGTYPE(*sig_type) (int);

#ifndef	O_BINARY
#  define  O_BINARY  0			/* creation mode for open() */
#endif

#ifndef O_CREAT
   /* Pure BSD system? */
#  include <sys/file.h>
#  ifndef O_CREAT
#    define O_CREAT FCREAT
#  endif
#  ifndef O_EXCL
#    define O_EXCL FEXCL
#  endif
#endif

#ifndef S_IRUSR
#  define S_IRUSR 0400
#endif
#ifndef S_IWUSR
#  define S_IWUSR 0200
#endif
#define RW_USER (S_IRUSR | S_IWUSR)	/* creation mode for open() */

#ifndef MAX_PATH_LEN			/* max pathname length */
#  ifdef BUFSIZ
#    define MAX_PATH_LEN   BUFSIZ
#  else
#    define MAX_PATH_LEN   1024
#  endif
#endif

#ifndef SEEK_END
#  define SEEK_END 2
#endif

#ifdef NO_OFF_T
typedef long off_t;
off_t lseek (int fd, off_t offset, int whence);
#endif


		/* global buffers */

DECLARE(uch, inbuf, INBUFSIZ + INBUF_EXTRA);
DECLARE(uch, outbuf, OUTBUFSIZ + OUTBUF_EXTRA);
DECLARE(ush, d_buf, DIST_BUFSIZE);
DECLARE(uch, window, 2L * WSIZE);
#ifndef MAXSEG_64K
DECLARE(ush, tab_prefix, 1L << BITS);
#else
DECLARE(ush, tab_prefix0, 1L << (BITS - 1));
DECLARE(ush, tab_prefix1, 1L << (BITS - 1));
#endif

		/* local variables */

int test_mode = 0;				/* check file integrity option */
int foreground;					/* set if program run in foreground */
int maxbits = BITS;				/* max bits per code for LZW */
int method = DEFLATED;			/* compression method */
int exit_code = OK;				/* program exit code */
int last_member;				/* set for .zip and .Z files */
int part_nb;					/* number of parts in .gz file */
long ifile_size;				/* input file size, -1 for devices (debug only) */

long bytes_in;					/* number of input bytes */
long bytes_out;					/* number of output bytes */
long total_in = 0;				/* input bytes for all files */
long total_out = 0;				/* output bytes for all files */
struct stat istat;				/* status for input file */
int ifd;						/* input file descriptor */
int ofd;						/* output file descriptor */
unsigned insize;				/* valid bytes in inbuf */
unsigned inptr;					/* index of next byte to be processed in inbuf */
unsigned outcnt;				/* bytes in output buffer */

long header_bytes;				/* number of bytes in gzip header */

/* local functions */

local int get_method (int in);

#define strequ(s1, s2) (strcmp((s1),(s2)) == 0)

/* ======================================================================== */
int gunzip_main(int argc, char **argv)
{
	int file_count;				/* number of files to precess */
	int to_stdout = 0;
	int fromstdin = 0;
	int result;
	int inFileNum;
	int outFileNum;
	int delInputFile = 0;
	struct stat statBuf;
	char *delFileName;
	char ifname[MAX_PATH_LEN + 1];	/* input file name */
	char ofname[MAX_PATH_LEN + 1];	/* output file name */

	if (strcmp(applet_name, "zcat") == 0) {
		to_stdout = 1;
		if (argc == 1) {
			fromstdin = 1;
		}
	}

	/* Parse any options */
	while (--argc > 0 && **(++argv) == '-') {
		if (*((*argv) + 1) == '\0') {
			fromstdin = 1;
			to_stdout = 1;
		}
		while (*(++(*argv))) {
			switch (**argv) {
			case 'c':
				to_stdout = 1;
				break;
			case 't':
				test_mode = 1;
				break;

			default:
				usage(gunzip_usage);
			}
		}
	}

	foreground = signal(SIGINT, SIG_IGN) != SIG_IGN;
	if (foreground) {
		(void) signal(SIGINT, (sig_type) abort_gzip);
	}
#ifdef SIGTERM
	if (signal(SIGTERM, SIG_IGN) != SIG_IGN) {
		(void) signal(SIGTERM, (sig_type) abort_gzip);
	}
#endif
#ifdef SIGHUP
	if (signal(SIGHUP, SIG_IGN) != SIG_IGN) {
		(void) signal(SIGHUP, (sig_type) abort_gzip);
	}
#endif

	file_count = argc - optind;

	/* Allocate all global buffers (for DYN_ALLOC option) */
	ALLOC(uch, inbuf, INBUFSIZ + INBUF_EXTRA);
	ALLOC(uch, outbuf, OUTBUFSIZ + OUTBUF_EXTRA);
	ALLOC(ush, d_buf, DIST_BUFSIZE);
	ALLOC(uch, window, 2L * WSIZE);
#ifndef MAXSEG_64K
	ALLOC(ush, tab_prefix, 1L << BITS);
#else
	ALLOC(ush, tab_prefix0, 1L << (BITS - 1));
	ALLOC(ush, tab_prefix1, 1L << (BITS - 1));
#endif

	if (fromstdin == 1) {
		strcpy(ofname, "stdin");

		inFileNum = fileno(stdin);
		ifile_size = -1L;		/* convention for unknown size */
	} else {
		/* Open up the input file */
		if (*argv == '\0')
			usage(gunzip_usage);
		if (strlen(*argv) > MAX_PATH_LEN) {
			errorMsg(name_too_long);
			exit(WARNING);
		}
		strcpy(ifname, *argv);

		/* Open input fille */
		inFileNum = open(ifname, O_RDONLY);
		if (inFileNum < 0) {
			perror(ifname);
			exit(WARNING);
		}
		/* Get the time stamp on the input file. */
		result = stat(ifname, &statBuf);
		if (result < 0) {
			perror(ifname);
			exit(WARNING);
		}
		ifile_size = statBuf.st_size;
	}

	if (to_stdout == 1) {
		/* And get to work */
		strcpy(ofname, "stdout");
		outFileNum = fileno(stdout);

		clear_bufs();			/* clear input and output buffers */
		part_nb = 0;

		/* Actually do the compression/decompression. */
		unzip(inFileNum, outFileNum);

	} else if (test_mode) {
		/* Actually do the compression/decompression. */
		unzip(inFileNum, 2);
	} else {
		char *pos;

		/* And get to work */
		if (strlen(ifname) > MAX_PATH_LEN - 4) {
			errorMsg(name_too_long);
			exit(WARNING);
		}
		strcpy(ofname, ifname);
		pos = strstr(ofname, ".gz");
		if (pos != NULL) {
			*pos = '\0';
			delInputFile = 1;
		} else {
			pos = strstr(ofname, ".tgz");
			if (pos != NULL) {
				*pos = '\0';
				strcat(pos, ".tar");
				delInputFile = 1;
			}
		}

		/* Open output fille */
#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
		outFileNum = open(ofname, O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW);
#else
		outFileNum = open(ofname, O_RDWR | O_CREAT | O_EXCL);
#endif
		if (outFileNum < 0) {
			perror(ofname);
			exit(WARNING);
		}
		/* Set permissions on the file */
		fchmod(outFileNum, statBuf.st_mode);

		clear_bufs();			/* clear input and output buffers */
		part_nb = 0;

		/* Actually do the compression/decompression. */
		result = unzip(inFileNum, outFileNum);

		close(outFileNum);
		close(inFileNum);
		/* Delete the original file */
		if (result == OK)
			delFileName = ifname;
		else
			delFileName = ofname;

		if (delInputFile == 1 && unlink(delFileName) < 0) {
			perror(delFileName);
			exit(FALSE);
		}
	}
	return(exit_code);
}


/* ========================================================================
 * Check the magic number of the input file and update ofname if an
 * original name was given and to_stdout is not set.
 * Return the compression method, -1 for error, -2 for warning.
 * Set inptr to the offset of the next byte to be processed.
 * Updates time_stamp if there is one and --no-time is not used.
 * This function may be called repeatedly for an input file consisting
 * of several contiguous gzip'ed members.
 * IN assertions: there is at least one remaining compressed member.
 *   If the member is a zip file, it must be the only one.
 */
local int get_method(in)
int in;							/* input file descriptor */
{
	uch flags;					/* compression flags */
	char magic[2];				/* magic header */

	magic[0] = (char) get_byte();
	magic[1] = (char) get_byte();
	method = -1;				/* unknown yet */
	part_nb++;					/* number of parts in gzip file */
	header_bytes = 0;
	last_member = RECORD_IO;
	/* assume multiple members in gzip file except for record oriented I/O */

	if (memcmp(magic, GZIP_MAGIC, 2) == 0) {

		method = (int) get_byte();
		if (method != DEFLATED) {
			errorMsg("unknown method %d -- get newer version of gzip\n",
					method);
			exit_code = ERROR;
			return -1;
		}
		flags = (uch) get_byte();

		(ulg) get_byte();		/* Ignore time stamp */
		(ulg) get_byte();
		(ulg) get_byte();
		(ulg) get_byte();

		(void) get_byte();		/* Ignore extra flags for the moment */
		(void) get_byte();		/* Ignore OS type for the moment */

		if ((flags & EXTRA_FIELD) != 0) {
			unsigned len = (unsigned) get_byte();

			len |= ((unsigned) get_byte()) << 8;

			while (len--)
				(void) get_byte();
		}

		/* Discard original name if any */
		if ((flags & ORIG_NAME) != 0) {
			while (get_char() != 0)	/* null */
				;
		}

		/* Discard file comment if any */
		if ((flags & COMMENT) != 0) {
			while (get_char() != 0)	/* null */
				;
		}
		if (part_nb == 1) {
			header_bytes = inptr + 2 * sizeof(long);	/* include crc and size */
		}

	}

	if (method >= 0)
		return method;

	if (part_nb == 1) {
		fprintf(stderr, "\nnot in gzip format\n");
		exit_code = ERROR;
		return -1;
	} else {
		WARN((stderr, "\ndecompression OK, trailing garbage ignored\n"));
		return -2;
	}
}

/* ========================================================================
 * Signal and error handler.
 */
RETSIGTYPE abort_gzip()
{
	exit(ERROR);
}

/* unzip.c -- decompress files in gzip or pkzip format.
 * Copyright (C) 1992-1993 Jean-loup Gailly
 * This is free software; you can redistribute it and/or modify it under the
 * terms of the GNU General Public License, see the file COPYING.
 *
 * The code in this file is derived from the file funzip.c written
 * and put in the public domain by Mark Adler.
 */

/*
   This version can extract files in gzip or pkzip format.
   For the latter, only the first entry is extracted, and it has to be
   either deflated or stored.
 */

/* #include "crypt.h" */

/* crypt.h (dummy version) -- do not perform encryption
 * Hardly worth copyrighting :-)
 */

#ifdef CRYPT
#  undef CRYPT					/* dummy version */
#endif

#define RAND_HEAD_LEN  12		/* length of encryption random header */

#define zencode
#define zdecode

/* PKZIP header definitions */
#define LOCSIG 0x04034b50L		/* four-byte lead-in (lsb first) */
#define LOCFLG 6				/* offset of bit flag */
#define  CRPFLG 1				/*  bit for encrypted entry */
#define  EXTFLG 8				/*  bit for extended local header */
#define LOCHOW 8				/* offset of compression method */
#define LOCTIM 10				/* file mod time (for decryption) */
#define LOCCRC 14				/* offset of crc */
#define LOCSIZ 18				/* offset of compressed size */
#define LOCLEN 22				/* offset of uncompressed length */
#define LOCFIL 26				/* offset of file name field length */
#define LOCEXT 28				/* offset of extra field length */
#define LOCHDR 30				/* size of local header, including sig */
#define EXTHDR 16				/* size of extended local header, inc sig */


/* Globals */

char *key;						/* not used--needed to link crypt.c */
int pkzip = 0;					/* set for a pkzip file */
int ext_header = 0;				/* set if extended local header */

/* ===========================================================================
 * Unzip in to out.  This routine works on both gzip and pkzip files.
 *
 * IN assertions: the buffer inbuf contains already the beginning of
 *   the compressed data, from offsets inptr to insize-1 included.
 *   The magic header has already been checked. The output buffer is cleared.
 */
int unzip(in, out)
int in, out;					/* input and output file descriptors */
{
	ulg orig_crc = 0;			/* original crc */
	ulg orig_len = 0;			/* original uncompressed length */
	int n;
	uch buf[EXTHDR];			/* extended local header */

	ifd = in;
	ofd = out;
	method = get_method(ifd);
	if (method < 0) {
		exit(exit_code);		/* error message already emitted */
	}

	updcrc(NULL, 0);			/* initialize crc */

	if (pkzip && !ext_header) {	/* crc and length at the end otherwise */
		orig_crc = LG(inbuf + LOCCRC);
		orig_len = LG(inbuf + LOCLEN);
	}

	/* Decompress */
	if (method == DEFLATED) {

		int res = inflate();

		if (res == 3) {
			errorMsg(memory_exhausted);
		} else if (res != 0) {
			errorMsg("invalid compressed data--format violated");
		}

	} else {
		errorMsg("internal error, invalid method");
	}

	/* Get the crc and original length */
	if (!pkzip) {
		/* crc32  (see algorithm.doc)
		   * uncompressed input size modulo 2^32
		 */
		for (n = 0; n < 8; n++) {
			buf[n] = (uch) get_byte();	/* may cause an error if EOF */
		}
		orig_crc = LG(buf);
		orig_len = LG(buf + 4);

	} else if (ext_header) {	/* If extended header, check it */
		/* signature - 4bytes: 0x50 0x4b 0x07 0x08
		 * CRC-32 value
		 * compressed size 4-bytes
		 * uncompressed size 4-bytes
		 */
		for (n = 0; n < EXTHDR; n++) {
			buf[n] = (uch) get_byte();	/* may cause an error if EOF */
		}
		orig_crc = LG(buf + 4);
		orig_len = LG(buf + 12);
	}

	/* Validate decompression */
	if (orig_crc != updcrc(outbuf, 0)) {
		errorMsg("invalid compressed data--crc error");
	}
	if (orig_len != (ulg) bytes_out) {
		errorMsg("invalid compressed data--length error");
	}

	/* Check if there are more entries in a pkzip file */
	if (pkzip && inptr + 4 < insize && LG(inbuf + inptr) == LOCSIG) {
		WARN((stderr, "has more than one entry--rest ignored\n"));
	}
	ext_header = pkzip = 0;		/* for next file */
	return OK;
}

/* util.c -- utility functions for gzip support
 * Copyright (C) 1992-1993 Jean-loup Gailly
 * This is free software; you can redistribute it and/or modify it under the
 * terms of the GNU General Public License, see the file COPYING.
 */

#include <ctype.h>
#include <errno.h>
#include <sys/types.h>

#ifdef HAVE_UNISTD_H
#  include <unistd.h>
#endif
#ifndef NO_FCNTL_H
#  include <fcntl.h>
#endif

#if defined(STDC_HEADERS) || !defined(NO_STDLIB_H)
#  include <stdlib.h>
#else
extern int errno;
#endif

static const ulg crc_32_tab[];	/* crc table, defined below */

/* ===========================================================================
 * Run a set of bytes through the crc shift register.  If s is a NULL
 * pointer, then initialize the crc shift register contents instead.
 * Return the current crc in either case.
 */
ulg updcrc(s, n)
uch *s;							/* pointer to bytes to pump through */
unsigned n;						/* number of bytes in s[] */
{
	register ulg c;				/* temporary variable */

	static ulg crc = (ulg) 0xffffffffL;	/* shift register contents */

	if (s == NULL) {
		c = 0xffffffffL;
	} else {
		c = crc;
		if (n)
			do {
				c = crc_32_tab[((int) c ^ (*s++)) & 0xff] ^ (c >> 8);
			} while (--n);
	}
	crc = c;
	return c ^ 0xffffffffL;		/* (instead of ~c for 64-bit machines) */
}

/* ===========================================================================
 * Clear input and output buffers
 */
void clear_bufs(void)
{
	outcnt = 0;
	insize = inptr = 0;
	bytes_in = bytes_out = 0L;
}

/* ===========================================================================
 * Fill the input buffer. This is called only when the buffer is empty.
 */
int fill_inbuf(eof_ok)
int eof_ok;						/* set if EOF acceptable as a result */
{
	int len;

	/* Read as much as possible */
	insize = 0;
	errno = 0;
	do {
		len = read(ifd, (char *) inbuf + insize, INBUFSIZ - insize);
		if (len == 0 || len == EOF)
			break;
		insize += len;
	} while (insize < INBUFSIZ);

	if (insize == 0) {
		if (eof_ok)
			return EOF;
		read_error_msg();
	}
	bytes_in += (ulg) insize;
	inptr = 1;
	return inbuf[0];
}

/* ===========================================================================
 * Write the output buffer outbuf[0..outcnt-1] and update bytes_out.
 * (used for the compressed data only)
 */
void flush_outbuf()
{
	if (outcnt == 0)
		return;

	if (!test_mode)
		write_buf(ofd, (char *) outbuf, outcnt);
	bytes_out += (ulg) outcnt;
	outcnt = 0;
}

/* ===========================================================================
 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 * (Used for the decompressed data only.)
 */
void flush_window()
{
	if (outcnt == 0)
		return;
	updcrc(window, outcnt);

	if (!test_mode)
		write_buf(ofd, (char *) window, outcnt);
	bytes_out += (ulg) outcnt;
	outcnt = 0;
}

/* ===========================================================================
 * Does the same as write(), but also handles partial pipe writes and checks
 * for error return.
 */
void write_buf(fd, buf, cnt)
int fd;
void * buf;
unsigned cnt;
{
	unsigned n;

	while ((n = write(fd, buf, cnt)) != cnt) {
		if (n == (unsigned) (-1)) {
			write_error_msg();
		}
		cnt -= n;
		buf = (void *) ((char *) buf + n);
	}
}

#if defined(NO_STRING_H) && !defined(STDC_HEADERS)

/* Provide missing strspn and strcspn functions. */

#  ifndef __STDC__
#    define const
#  endif

int strspn (const char *s, const char *accept);
int strcspn (const char *s, const char *reject);

/* ========================================================================
 * Return the length of the maximum initial segment
 * of s which contains only characters in accept.
 */
int strspn(s, accept)
const char *s;
const char *accept;
{
	register const char *p;
	register const char *a;
	register int count = 0;

	for (p = s; *p != '\0'; ++p) {
		for (a = accept; *a != '\0'; ++a) {
			if (*p == *a)
				break;
		}
		if (*a == '\0')
			return count;
		++count;
	}
	return count;
}

/* ========================================================================
 * Return the length of the maximum inital segment of s
 * which contains no characters from reject.
 */
int strcspn(s, reject)
const char *s;
const char *reject;
{
	register int count = 0;

	while (*s != '\0') {
		if (strchr(reject, *s++) != NULL)
			return count;
		++count;
	}
	return count;
}

#endif							/* NO_STRING_H */


/* ========================================================================
 * Error handlers.
 */
void read_error_msg()
{
	fprintf(stderr, "\n");
	if (errno != 0) {
		perror("");
	} else {
		fprintf(stderr, "unexpected end of file\n");
	}
	abort_gzip();
}

void write_error_msg()
{
	fprintf(stderr, "\n");
	perror("");
	abort_gzip();
}


/* ========================================================================
 * Table of CRC-32's of all single-byte values (made by makecrc.c)
 */
static const ulg crc_32_tab[] = {
	0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
	0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
	0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
	0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
	0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
	0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
	0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
	0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
	0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
	0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
	0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
	0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
	0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
	0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
	0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
	0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
	0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
	0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
	0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
	0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
	0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
	0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
	0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
	0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
	0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
	0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
	0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
	0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
	0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
	0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
	0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
	0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
	0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
	0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
	0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
	0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
	0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
	0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
	0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
	0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
	0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
	0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
	0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
	0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
	0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
	0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
	0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
	0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
	0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
	0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
	0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
	0x2d02ef8dL
};

/* inflate.c -- Not copyrighted 1992 by Mark Adler
   version c10p1, 10 January 1993 */

/* You can do whatever you like with this source file, though I would
   prefer that if you modify it and redistribute it that you include
   comments to that effect with your name and the date.  Thank you.
   [The history has been moved to the file ChangeLog.]
 */

/*
   Inflate deflated (PKZIP's method 8 compressed) data.  The compression
   method searches for as much of the current string of bytes (up to a
   length of 258) in the previous 32K bytes.  If it doesn't find any
   matches (of at least length 3), it codes the next byte.  Otherwise, it
   codes the length of the matched string and its distance backwards from
   the current position.  There is a single Huffman code that codes both
   single bytes (called "literals") and match lengths.  A second Huffman
   code codes the distance information, which follows a length code.  Each
   length or distance code actually represents a base value and a number
   of "extra" (sometimes zero) bits to get to add to the base value.  At
   the end of each deflated block is a special end-of-block (EOB) literal/
   length code.  The decoding process is basically: get a literal/length
   code; if EOB then done; if a literal, emit the decoded byte; if a
   length then get the distance and emit the referred-to bytes from the
   sliding window of previously emitted data.

   There are (currently) three kinds of inflate blocks: stored, fixed, and
   dynamic.  The compressor deals with some chunk of data at a time, and
   decides which method to use on a chunk-by-chunk basis.  A chunk might
   typically be 32K or 64K.  If the chunk is uncompressible, then the
   "stored" method is used.  In this case, the bytes are simply stored as
   is, eight bits per byte, with none of the above coding.  The bytes are
   preceded by a count, since there is no longer an EOB code.

   If the data is compressible, then either the fixed or dynamic methods
   are used.  In the dynamic method, the compressed data is preceded by
   an encoding of the literal/length and distance Huffman codes that are
   to be used to decode this block.  The representation is itself Huffman
   coded, and so is preceded by a description of that code.  These code
   descriptions take up a little space, and so for small blocks, there is
   a predefined set of codes, called the fixed codes.  The fixed method is
   used if the block codes up smaller that way (usually for quite small
   chunks), otherwise the dynamic method is used.  In the latter case, the
   codes are customized to the probabilities in the current block, and so
   can code it much better than the pre-determined fixed codes.
 
   The Huffman codes themselves are decoded using a mutli-level table
   lookup, in order to maximize the speed of decoding plus the speed of
   building the decoding tables.  See the comments below that precede the
   lbits and dbits tuning parameters.
 */


/*
   Notes beyond the 1.93a appnote.txt:

   1. Distance pointers never point before the beginning of the output
      stream.
   2. Distance pointers can point back across blocks, up to 32k away.
   3. There is an implied maximum of 7 bits for the bit length table and
      15 bits for the actual data.
   4. If only one code exists, then it is encoded using one bit.  (Zero
      would be more efficient, but perhaps a little confusing.)  If two
      codes exist, they are coded using one bit each (0 and 1).
   5. There is no way of sending zero distance codes--a dummy must be
      sent if there are none.  (History: a pre 2.0 version of PKZIP would
      store blocks with no distance codes, but this was discovered to be
      too harsh a criterion.)  Valid only for 1.93a.  2.04c does allow
      zero distance codes, which is sent as one code of zero bits in
      length.
   6. There are up to 286 literal/length codes.  Code 256 represents the
      end-of-block.  Note however that the static length tree defines
      288 codes just to fill out the Huffman codes.  Codes 286 and 287
      cannot be used though, since there is no length base or extra bits
      defined for them.  Similarly, there are up to 30 distance codes.
      However, static trees define 32 codes (all 5 bits) to fill out the
      Huffman codes, but the last two had better not show up in the data.
   7. Unzip can check dynamic Huffman blocks for complete code sets.
      The exception is that a single code would not be complete (see #4).
   8. The five bits following the block type is really the number of
      literal codes sent minus 257.
   9. Length codes 8,16,16 are interpreted as 13 length codes of 8 bits
      (1+6+6).  Therefore, to output three times the length, you output
      three codes (1+1+1), whereas to output four times the same length,
      you only need two codes (1+3).  Hmm.
  10. In the tree reconstruction algorithm, Code = Code + Increment
      only if BitLength(i) is not zero.  (Pretty obvious.)
  11. Correction: 4 Bits: # of Bit Length codes - 4     (4 - 19)
  12. Note: length code 284 can represent 227-258, but length code 285
      really is 258.  The last length deserves its own, short code
      since it gets used a lot in very redundant files.  The length
      258 is special since 258 - 3 (the min match length) is 255.
  13. The literal/length and distance code bit lengths are read as a
      single stream of lengths.  It is possible (and advantageous) for
      a repeat code (16, 17, or 18) to go across the boundary between
      the two sets of lengths.
 */

#include <sys/types.h>

#if defined(STDC_HEADERS) || !defined(NO_STDLIB_H)
#  include <stdlib.h>
#endif


#define slide window

/* Huffman code lookup table entry--this entry is four bytes for machines
   that have 16-bit pointers (e.g. PC's in the small or medium model).
   Valid extra bits are 0..13.  e == 15 is EOB (end of block), e == 16
   means that v is a literal, 16 < e < 32 means that v is a pointer to
   the next table, which codes e - 16 bits, and lastly e == 99 indicates
   an unused code.  If a code with e == 99 is looked up, this implies an
   error in the data. */
struct huft {
	uch e;						/* number of extra bits or operation */
	uch b;						/* number of bits in this code or subcode */
	union {
		ush n;					/* literal, length base, or distance base */
		struct huft *t;			/* pointer to next level of table */
	} v;
};


/* Function prototypes */
int huft_build (unsigned *, unsigned, unsigned, ush *, ush *,
				   struct huft **, int *);
int huft_free (struct huft *);
int inflate_codes (struct huft *, struct huft *, int, int);
int inflate_stored (void);
int inflate_fixed (void);
int inflate_dynamic (void);
int inflate_block (int *);
int inflate (void);


/* The inflate algorithm uses a sliding 32K byte window on the uncompressed
   stream to find repeated byte strings.  This is implemented here as a
   circular buffer.  The index is updated simply by incrementing and then
   and'ing with 0x7fff (32K-1). */
/* It is left to other modules to supply the 32K area.  It is assumed
   to be usable as if it were declared "uch slide[32768];" or as just
   "uch *slide;" and then malloc'ed in the latter case.  The definition
   must be in unzip.h, included above. */
/* unsigned wp;             current position in slide */
#define wp outcnt
#define flush_output(w) (wp=(w),flush_window())

/* Tables for deflate from PKZIP's appnote.txt. */
static unsigned border[] = {	/* Order of the bit length code lengths */
	16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15
};
static ush cplens[] = {			/* Copy lengths for literal codes 257..285 */
	3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
	35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0
};

		/* note: see note #13 above about the 258 in this list. */
static ush cplext[] = {			/* Extra bits for literal codes 257..285 */
	0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2,
	3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 99, 99
};								/* 99==invalid */
static ush cpdist[] = {			/* Copy offsets for distance codes 0..29 */
	1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
	257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
	8193, 12289, 16385, 24577
};
static ush cpdext[] = {			/* Extra bits for distance codes */
	0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6,
	7, 7, 8, 8, 9, 9, 10, 10, 11, 11,
	12, 12, 13, 13
};



/* Macros for inflate() bit peeking and grabbing.
   The usage is:
   
        NEEDBITS(j)
        x = b & mask_bits[j];
        DUMPBITS(j)

   where NEEDBITS makes sure that b has at least j bits in it, and
   DUMPBITS removes the bits from b.  The macros use the variable k
   for the number of bits in b.  Normally, b and k are register
   variables for speed, and are initialized at the beginning of a
   routine that uses these macros from a global bit buffer and count.

   If we assume that EOB will be the longest code, then we will never
   ask for bits with NEEDBITS that are beyond the end of the stream.
   So, NEEDBITS should not read any more bytes than are needed to
   meet the request.  Then no bytes need to be "returned" to the buffer
   at the end of the last block.

   However, this assumption is not true for fixed blocks--the EOB code
   is 7 bits, but the other literal/length codes can be 8 or 9 bits.
   (The EOB code is shorter than other codes because fixed blocks are
   generally short.  So, while a block always has an EOB, many other
   literal/length codes have a significantly lower probability of
   showing up at all.)  However, by making the first table have a
   lookup of seven bits, the EOB code will be found in that first
   lookup, and so will not require that too many bits be pulled from
   the stream.
 */

ulg bb;							/* bit buffer */
unsigned bk;					/* bits in bit buffer */

ush mask_bits[] = {
	0x0000,
	0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,
	0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff
};

#ifdef CRYPT
uch cc;

#  define NEXTBYTE() (cc = get_byte(), zdecode(cc), cc)
#else
#  define NEXTBYTE()  (uch)get_byte()
#endif
#define NEEDBITS(n) {while(k<(n)){b|=((ulg)NEXTBYTE())<<k;k+=8;}}
#define DUMPBITS(n) {b>>=(n);k-=(n);}


/*
   Huffman code decoding is performed using a multi-level table lookup.
   The fastest way to decode is to simply build a lookup table whose
   size is determined by the longest code.  However, the time it takes
   to build this table can also be a factor if the data being decoded
   is not very long.  The most common codes are necessarily the
   shortest codes, so those codes dominate the decoding time, and hence
   the speed.  The idea is you can have a shorter table that decodes the
   shorter, more probable codes, and then point to subsidiary tables for
   the longer codes.  The time it costs to decode the longer codes is
   then traded against the time it takes to make longer tables.

   This results of this trade are in the variables lbits and dbits
   below.  lbits is the number of bits the first level table for literal/
   length codes can decode in one step, and dbits is the same thing for
   the distance codes.  Subsequent tables are also less than or equal to
   those sizes.  These values may be adjusted either when all of the
   codes are shorter than that, in which case the longest code length in
   bits is used, or when the shortest code is *longer* than the requested
   table size, in which case the length of the shortest code in bits is
   used.

   There are two different values for the two tables, since they code a
   different number of possibilities each.  The literal/length table
   codes 286 possible values, or in a flat code, a little over eight
   bits.  The distance table codes 30 possible values, or a little less
   than five bits, flat.  The optimum values for speed end up being
   about one bit more than those, so lbits is 8+1 and dbits is 5+1.
   The optimum values may differ though from machine to machine, and
   possibly even between compilers.  Your mileage may vary.
 */


int lbits = 9;					/* bits in base literal/length lookup table */
int dbits = 6;					/* bits in base distance lookup table */


/* If BMAX needs to be larger than 16, then h and x[] should be ulg. */
#define BMAX 16					/* maximum bit length of any code (16 for explode) */
#define N_MAX 288				/* maximum number of codes in any set */


unsigned hufts;					/* track memory usage */


int huft_build(b, n, s, d, e, t, m)
unsigned *b;					/* code lengths in bits (all assumed <= BMAX) */
unsigned n;						/* number of codes (assumed <= N_MAX) */
unsigned s;						/* number of simple-valued codes (0..s-1) */
ush *d;							/* list of base values for non-simple codes */
ush *e;							/* list of extra bits for non-simple codes */
struct huft **t;				/* result: starting table */
int *m;							/* maximum lookup bits, returns actual */

/* Given a list of code lengths and a maximum table size, make a set of
   tables to decode that set of codes.  Return zero on success, one if
   the given code set is incomplete (the tables are still built in this
   case), two if the input is invalid (all zero length codes or an
   oversubscribed set of lengths), and three if not enough memory. */
{
	unsigned a;					/* counter for codes of length k */
	unsigned c[BMAX + 1];		/* bit length count table */
	unsigned f;					/* i repeats in table every f entries */
	int g;						/* maximum code length */
	int h;						/* table level */
	register unsigned i;		/* counter, current code */
	register unsigned j;		/* counter */
	register int k;				/* number of bits in current code */
	int l;						/* bits per table (returned in m) */
	register unsigned *p;		/* pointer into c[], b[], or v[] */
	register struct huft *q;	/* points to current table */
	struct huft r;				/* table entry for structure assignment */
	struct huft *u[BMAX];		/* table stack */
	unsigned v[N_MAX];			/* values in order of bit length */
	register int w;				/* bits before this table == (l * h) */
	unsigned x[BMAX + 1];		/* bit offsets, then code stack */
	unsigned *xp;				/* pointer into x */
	int y;						/* number of dummy codes added */
	unsigned z;					/* number of entries in current table */


	/* Generate counts for each bit length */
	memzero(c, sizeof(c));
	p = b;
	i = n;
	do {
		Tracecv(*p,
				(stderr,
				 (n - i >= ' '
				  && n - i <= '~' ? "%c %d\n" : "0x%x %d\n"), n - i, *p));
		c[*p]++;				/* assume all entries <= BMAX */
		p++;					/* Can't combine with above line (Solaris bug) */
	} while (--i);
	if (c[0] == n) {			/* null input--all zero length codes */
		*t = (struct huft *) NULL;
		*m = 0;
		return 0;
	}


	/* Find minimum and maximum length, bound *m by those */
	l = *m;
	for (j = 1; j <= BMAX; j++)
		if (c[j])
			break;
	k = j;						/* minimum code length */
	if ((unsigned) l < j)
		l = j;
	for (i = BMAX; i; i--)
		if (c[i])
			break;
	g = i;						/* maximum code length */
	if ((unsigned) l > i)
		l = i;
	*m = l;


	/* Adjust last length count to fill out codes, if needed */
	for (y = 1 << j; j < i; j++, y <<= 1)
		if ((y -= c[j]) < 0)
			return 2;			/* bad input: more codes than bits */
	if ((y -= c[i]) < 0)
		return 2;
	c[i] += y;


	/* Generate starting offsets into the value table for each length */
	x[1] = j = 0;
	p = c + 1;
	xp = x + 2;
	while (--i) {				/* note that i == g from above */
		*xp++ = (j += *p++);
	}


	/* Make a table of values in order of bit lengths */
	p = b;
	i = 0;
	do {
		if ((j = *p++) != 0)
			v[x[j]++] = i;
	} while (++i < n);


	/* Generate the Huffman codes and for each, make the table entries */
	x[0] = i = 0;				/* first Huffman code is zero */
	p = v;						/* grab values in bit order */
	h = -1;						/* no tables yet--level -1 */
	w = -l;						/* bits decoded == (l * h) */
	u[0] = (struct huft *) NULL;	/* just to keep compilers happy */
	q = (struct huft *) NULL;	/* ditto */
	z = 0;						/* ditto */

	/* go through the bit lengths (k already is bits in shortest code) */
	for (; k <= g; k++) {
		a = c[k];
		while (a--) {
			/* here i is the Huffman code of length k bits for value *p */
			/* make tables up to required level */
			while (k > w + l) {
				h++;
				w += l;			/* previous table always l bits */

				/* compute minimum size table less than or equal to l bits */
				z = (z = g - w) > (unsigned) l ? l : z;	/* upper limit on table size */
				if ((f = 1 << (j = k - w)) > a + 1) {	/* try a k-w bit table *//* too few codes for k-w bit table */
					f -= a + 1;	/* deduct codes from patterns left */
					xp = c + k;
					while (++j < z) {	/* try smaller tables up to z bits */
						if ((f <<= 1) <= *++xp)
							break;	/* enough codes to use up j bits */
						f -= *xp;	/* else deduct codes from patterns */
					}
				}
				z = 1 << j;		/* table entries for j-bit table */

				/* allocate and link in new table */
				if (
					(q =
					 (struct huft *) malloc((z + 1) *
											sizeof(struct huft))) ==
					(struct huft *) NULL) {
					if (h)
						huft_free(u[0]);
					return 3;	/* not enough memory */
				}
				hufts += z + 1;	/* track memory usage */
				*t = q + 1;		/* link to list for huft_free() */
				*(t = &(q->v.t)) = (struct huft *) NULL;
				u[h] = ++q;		/* table starts after link */

				/* connect to last table, if there is one */
				if (h) {
					x[h] = i;	/* save pattern for backing up */
					r.b = (uch) l;	/* bits to dump before this table */
					r.e = (uch) (16 + j);	/* bits in this table */
					r.v.t = q;	/* pointer to this table */
					j = i >> (w - l);	/* (get around Turbo C bug) */
					u[h - 1][j] = r;	/* connect to last table */
				}
			}

			/* set up table entry in r */
			r.b = (uch) (k - w);
			if (p >= v + n)
				r.e = 99;		/* out of values--invalid code */
			else if (*p < s) {
				r.e = (uch) (*p < 256 ? 16 : 15);	/* 256 is end-of-block code */
				r.v.n = (ush) (*p);	/* simple code is just the value */
				p++;			/* one compiler does not like *p++ */
			} else {
				r.e = (uch) e[*p - s];	/* non-simple--look up in lists */
				r.v.n = d[*p++ - s];
			}

			/* fill code-like entries with r */
			f = 1 << (k - w);
			for (j = i >> w; j < z; j += f)
				q[j] = r;

			/* backwards increment the k-bit code i */
			for (j = 1 << (k - 1); i & j; j >>= 1)
				i ^= j;
			i ^= j;

			/* backup over finished tables */
			while ((i & ((1 << w) - 1)) != x[h]) {
				h--;			/* don't need to update q */
				w -= l;
			}
		}
	}


	/* Return true (1) if we were given an incomplete table */
	return y != 0 && g != 1;
}



int huft_free(t)
struct huft *t;					/* table to free */

/* Free the malloc'ed tables built by huft_build(), which makes a linked
   list of the tables it made, with the links in a dummy first entry of
   each table. */
{
	register struct huft *p, *q;


	/* Go through linked list, freeing from the malloced (t[-1]) address. */
	p = t;
	while (p != (struct huft *) NULL) {
		q = (--p)->v.t;
		free((char *) p);
		p = q;
	}
	return 0;
}


int inflate_codes(tl, td, bl, bd)
struct huft *tl, *td;			/* literal/length and distance decoder tables */
int bl, bd;						/* number of bits decoded by tl[] and td[] */

/* inflate (decompress) the codes in a deflated (compressed) block.
   Return an error code or zero if it all goes ok. */
{
	register unsigned e;		/* table entry flag/number of extra bits */
	unsigned n, d;				/* length and index for copy */
	unsigned w;					/* current window position */
	struct huft *t;				/* pointer to table entry */
	unsigned ml, md;			/* masks for bl and bd bits */
	register ulg b;				/* bit buffer */
	register unsigned k;		/* number of bits in bit buffer */


	/* make local copies of globals */
	b = bb;						/* initialize bit buffer */
	k = bk;
	w = wp;						/* initialize window position */

	/* inflate the coded data */
	ml = mask_bits[bl];			/* precompute masks for speed */
	md = mask_bits[bd];
	for (;;) {					/* do until end of block */
		NEEDBITS((unsigned) bl)
			if ((e = (t = tl + ((unsigned) b & ml))->e) > 16)
			do {
				if (e == 99)
					return 1;
				DUMPBITS(t->b)
					e -= 16;
				NEEDBITS(e)
			} while ((e = (t = t->v.t + ((unsigned) b & mask_bits[e]))->e)
					 > 16);
		DUMPBITS(t->b)
			if (e == 16) {		/* then it's a literal */
			slide[w++] = (uch) t->v.n;
			Tracevv((stderr, "%c", slide[w - 1]));
			if (w == WSIZE) {
				flush_output(w);
				w = 0;
			}
		} else {				/* it's an EOB or a length */

			/* exit if end of block */
			if (e == 15)
				break;

			/* get length of block to copy */
			NEEDBITS(e)
				n = t->v.n + ((unsigned) b & mask_bits[e]);
			DUMPBITS(e);

			/* decode distance of block to copy */
			NEEDBITS((unsigned) bd)
				if ((e = (t = td + ((unsigned) b & md))->e) > 16)
				do {
					if (e == 99)
						return 1;
					DUMPBITS(t->b)
						e -= 16;
					NEEDBITS(e)
				}
					while (
						   (e =
							(t =
							 t->v.t + ((unsigned) b & mask_bits[e]))->e) >
						   16);
			DUMPBITS(t->b)
				NEEDBITS(e)
				d = w - t->v.n - ((unsigned) b & mask_bits[e]);
			DUMPBITS(e)
				Tracevv((stderr, "\\[%d,%d]", w - d, n));

			/* do the copy */
			do {
				n -= (e =
					  (e =
					   WSIZE - ((d &= WSIZE - 1) > w ? d : w)) >
					  n ? n : e);
#if !defined(NOMEMCPY) && !defined(DEBUG)
				if (w - d >= e) {	/* (this test assumes unsigned comparison) */
					memcpy(slide + w, slide + d, e);
					w += e;
					d += e;
				} else			/* do it slow to avoid memcpy() overlap */
#endif							/* !NOMEMCPY */
					do {
						slide[w++] = slide[d++];
						Tracevv((stderr, "%c", slide[w - 1]));
					} while (--e);
				if (w == WSIZE) {
					flush_output(w);
					w = 0;
				}
			} while (n);
		}
	}


	/* restore the globals from the locals */
	wp = w;						/* restore global window pointer */
	bb = b;						/* restore global bit buffer */
	bk = k;

	/* done */
	return 0;
}



int inflate_stored()
/* "decompress" an inflated type 0 (stored) block. */
{
	unsigned n;					/* number of bytes in block */
	unsigned w;					/* current window position */
	register ulg b;				/* bit buffer */
	register unsigned k;		/* number of bits in bit buffer */


	/* make local copies of globals */
	b = bb;						/* initialize bit buffer */
	k = bk;
	w = wp;						/* initialize window position */


	/* go to byte boundary */
	n = k & 7;
	DUMPBITS(n);


	/* get the length and its complement */
	NEEDBITS(16)
		n = ((unsigned) b & 0xffff);
	DUMPBITS(16)
		NEEDBITS(16)
		if (n != (unsigned) ((~b) & 0xffff))
		return 1;				/* error in compressed data */
	DUMPBITS(16)


		/* read and output the compressed data */
		while (n--) {
		NEEDBITS(8)
			slide[w++] = (uch) b;
		if (w == WSIZE) {
			flush_output(w);
			w = 0;
		}
		DUMPBITS(8)
	}


	/* restore the globals from the locals */
	wp = w;						/* restore global window pointer */
	bb = b;						/* restore global bit buffer */
	bk = k;
	return 0;
}



int inflate_fixed()
/* decompress an inflated type 1 (fixed Huffman codes) block.  We should
   either replace this with a custom decoder, or at least precompute the
   Huffman tables. */
{
	int i;						/* temporary variable */
	struct huft *tl;			/* literal/length code table */
	struct huft *td;			/* distance code table */
	int bl;						/* lookup bits for tl */
	int bd;						/* lookup bits for td */
	unsigned l[288];			/* length list for huft_build */


	/* set up literal table */
	for (i = 0; i < 144; i++)
		l[i] = 8;
	for (; i < 256; i++)
		l[i] = 9;
	for (; i < 280; i++)
		l[i] = 7;
	for (; i < 288; i++)		/* make a complete, but wrong code set */
		l[i] = 8;
	bl = 7;
	if ((i = huft_build(l, 288, 257, cplens, cplext, &tl, &bl)) != 0)
		return i;


	/* set up distance table */
	for (i = 0; i < 30; i++)	/* make an incomplete code set */
		l[i] = 5;
	bd = 5;
	if ((i = huft_build(l, 30, 0, cpdist, cpdext, &td, &bd)) > 1) {
		huft_free(tl);
		return i;
	}


	/* decompress until an end-of-block code */
	if (inflate_codes(tl, td, bl, bd))
		return 1;


	/* free the decoding tables, return */
	huft_free(tl);
	huft_free(td);
	return 0;
}



int inflate_dynamic()
/* decompress an inflated type 2 (dynamic Huffman codes) block. */
{
	int i;						/* temporary variables */
	unsigned j;
	unsigned l;					/* last length */
	unsigned m;					/* mask for bit lengths table */
	unsigned n;					/* number of lengths to get */
	struct huft *tl;			/* literal/length code table */
	struct huft *td;			/* distance code table */
	int bl;						/* lookup bits for tl */
	int bd;						/* lookup bits for td */
	unsigned nb;				/* number of bit length codes */
	unsigned nl;				/* number of literal/length codes */
	unsigned nd;				/* number of distance codes */

#ifdef PKZIP_BUG_WORKAROUND
	unsigned ll[288 + 32];		/* literal/length and distance code lengths */
#else
	unsigned ll[286 + 30];		/* literal/length and distance code lengths */
#endif
	register ulg b;				/* bit buffer */
	register unsigned k;		/* number of bits in bit buffer */


	/* make local bit buffer */
	b = bb;
	k = bk;


	/* read in table lengths */
	NEEDBITS(5)
		nl = 257 + ((unsigned) b & 0x1f);	/* number of literal/length codes */
	DUMPBITS(5)
		NEEDBITS(5)
		nd = 1 + ((unsigned) b & 0x1f);	/* number of distance codes */
	DUMPBITS(5)
		NEEDBITS(4)
		nb = 4 + ((unsigned) b & 0xf);	/* number of bit length codes */
	DUMPBITS(4)
#ifdef PKZIP_BUG_WORKAROUND
		if (nl > 288 || nd > 32)
#else
		if (nl > 286 || nd > 30)
#endif
		return 1;				/* bad lengths */


	/* read in bit-length-code lengths */
	for (j = 0; j < nb; j++) {
		NEEDBITS(3)
			ll[border[j]] = (unsigned) b & 7;
		DUMPBITS(3)
	}
	for (; j < 19; j++)
		ll[border[j]] = 0;


	/* build decoding table for trees--single level, 7 bit lookup */
	bl = 7;
	if ((i = huft_build(ll, 19, 19, NULL, NULL, &tl, &bl)) != 0) {
		if (i == 1)
			huft_free(tl);
		return i;				/* incomplete code set */
	}


	/* read in literal and distance code lengths */
	n = nl + nd;
	m = mask_bits[bl];
	i = l = 0;
	while ((unsigned) i < n) {
		NEEDBITS((unsigned) bl)
			j = (td = tl + ((unsigned) b & m))->b;
		DUMPBITS(j)
			j = td->v.n;
		if (j < 16)				/* length of code in bits (0..15) */
			ll[i++] = l = j;	/* save last length in l */
		else if (j == 16) {		/* repeat last length 3 to 6 times */
			NEEDBITS(2)
				j = 3 + ((unsigned) b & 3);
			DUMPBITS(2)
				if ((unsigned) i + j > n)
				return 1;
			while (j--)
				ll[i++] = l;
		} else if (j == 17) {	/* 3 to 10 zero length codes */
			NEEDBITS(3)
				j = 3 + ((unsigned) b & 7);
			DUMPBITS(3)
				if ((unsigned) i + j > n)
				return 1;
			while (j--)
				ll[i++] = 0;
			l = 0;
		} else {				/* j == 18: 11 to 138 zero length codes */

			NEEDBITS(7)
				j = 11 + ((unsigned) b & 0x7f);
			DUMPBITS(7)
				if ((unsigned) i + j > n)
				return 1;
			while (j--)
				ll[i++] = 0;
			l = 0;
		}
	}


	/* free decoding table for trees */
	huft_free(tl);


	/* restore the global bit buffer */
	bb = b;
	bk = k;


	/* build the decoding tables for literal/length and distance codes */
	bl = lbits;
	if ((i = huft_build(ll, nl, 257, cplens, cplext, &tl, &bl)) != 0) {
		if (i == 1) {
			fprintf(stderr, " incomplete literal tree\n");
			huft_free(tl);
		}
		return i;				/* incomplete code set */
	}
	bd = dbits;
	if ((i = huft_build(ll + nl, nd, 0, cpdist, cpdext, &td, &bd)) != 0) {
		if (i == 1) {
			fprintf(stderr, " incomplete distance tree\n");
#ifdef PKZIP_BUG_WORKAROUND
			i = 0;
		}
#else
			huft_free(td);
		}
		huft_free(tl);
		return i;				/* incomplete code set */
#endif
	}


	/* decompress until an end-of-block code */
	if (inflate_codes(tl, td, bl, bd))
		return 1;


	/* free the decoding tables, return */
	huft_free(tl);
	huft_free(td);
	return 0;
}



int inflate_block(e)
int *e;							/* last block flag */

/* decompress an inflated block */
{
	unsigned t;					/* block type */
	register ulg b;				/* bit buffer */
	register unsigned k;		/* number of bits in bit buffer */


	/* make local bit buffer */
	b = bb;
	k = bk;


	/* read in last block bit */
	NEEDBITS(1)
		* e = (int) b & 1;
	DUMPBITS(1)


		/* read in block type */
		NEEDBITS(2)
		t = (unsigned) b & 3;
	DUMPBITS(2)


		/* restore the global bit buffer */
		bb = b;
	bk = k;


	/* inflate that block type */
	if (t == 2)
		return inflate_dynamic();
	if (t == 0)
		return inflate_stored();
	if (t == 1)
		return inflate_fixed();


	/* bad block type */
	return 2;
}



int inflate()
/* decompress an inflated entry */
{
	int e;						/* last block flag */
	int r;						/* result code */
	unsigned h;					/* maximum struct huft's malloc'ed */


	/* initialize window, bit buffer */
	wp = 0;
	bk = 0;
	bb = 0;


	/* decompress until the last block */
	h = 0;
	do {
		hufts = 0;
		if ((r = inflate_block(&e)) != 0)
			return r;
		if (hufts > h)
			h = hufts;
	} while (!e);

	/* Undo too much lookahead. The next read will be byte aligned so we
	 * can discard unused bits in the last meaningful byte.
	 */
	while (bk >= 8) {
		bk -= 8;
		inptr--;
	}

	/* flush out slide */
	flush_output(wp);


	/* return success */
#ifdef DEBUG
	fprintf(stderr, "<%u> ", h);
#endif							/* DEBUG */
	return 0;
}