aboutsummaryrefslogtreecommitdiff
path: root/common/unzip.cpp
blob: 8061f712d4889acb4b15af7d648de01027c32515 (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
/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

/* unzip.c -- IO on .zip files using zlib
   Version 0.15 beta, Mar 19th, 1998,

   Read unzip.h for more info
*/

/* unzip.h -- IO for uncompress .zip files using zlib
   Version 0.15 beta, Mar 19th, 1998,

   Copyright (C) 1998 Gilles Vollant

   This unzip package allow extract file from .ZIP file, compatible with PKZip 2.04g
     WinZip, InfoZip tools and compatible.
   Encryption and multi volume ZipFile (span) are not supported.
   Old compressions used by old PKZip 1.x are not supported

   THIS IS AN ALPHA VERSION. AT THIS STAGE OF DEVELOPPEMENT, SOMES API OR STRUCTURE
   CAN CHANGE IN FUTURE VERSION !!
   I WAIT FEEDBACK at mail info@winimage.com
   Visit also http://www.winimage.com/zLibDll/unzip.htm for evolution

   Condition of use and distribution are the same than zlib :

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.


*/
/* for more info about .ZIP format, see
      ftp://ftp.cdrom.com/pub/infozip/doc/appnote-970311-iz.zip
   PkWare has also a specification at :
      ftp://ftp.pkware.com/probdesc.zip */

// Disable symbol overrides so that we can use zlib.h
#define FORBIDDEN_SYMBOL_ALLOW_ALL

#include "common/scummsys.h"

#ifdef USE_ZLIB

#ifdef __SYMBIAN32__
#include <zlib\zlib.h>
#else
#include <zlib.h>
#endif

#else  // !USE_ZLIB

// Even when zlib is not linked in, we can still open ZIP archives and read
// uncompressed files from them.  Attempted decompression of compressed files
// will result in an error.
//
// Define the constants and types used by zlib.
#define Z_ERRNO -1
#define Z_OK 0
#define Z_DEFLATED 8
typedef void *voidp;
typedef unsigned int uInt;
typedef unsigned long uLong;
typedef long z_off_t;
typedef unsigned char Byte;
typedef Byte Bytef;
typedef struct {
    Bytef    *next_in, *next_out;
    uInt     avail_in, avail_out;
    uLong    total_out;
} z_stream;

#endif  // !USE_ZLIB

#include "common/fs.h"
#include "common/unzip.h"
#include "common/memstream.h"

#include "common/hashmap.h"
#include "common/hash-str.h"

#if defined(STRICTUNZIP) || defined(STRICTZIPUNZIP)
/* like the STRICT of WIN32, we define a pointer that cannot be converted
    from (void*) without cast */
typedef struct TagunzFile__ { int unused; } unzFile__;
typedef unzFile__ *unzFile;
#else
typedef voidp unzFile;
#endif

#define UNZ_OK                                  (0)
#define UNZ_END_OF_LIST_OF_FILE (-100)
#define UNZ_ERRNO               (Z_ERRNO)
#define UNZ_EOF                 (0)
#define UNZ_PARAMERROR                  (-102)
#define UNZ_BADZIPFILE                  (-103)
#define UNZ_INTERNALERROR               (-104)
#define UNZ_CRCERROR                    (-105)

/* tm_unz contain date/time info */
typedef struct {
	uInt tm_sec;            /* seconds after the minute - [0,59] */
	uInt tm_min;            /* minutes after the hour - [0,59] */
	uInt tm_hour;           /* hours since midnight - [0,23] */
	uInt tm_mday;           /* day of the month - [1,31] */
	uInt tm_mon;            /* months since January - [0,11] */
	uInt tm_year;           /* years - [1980..2044] */
} tm_unz;

/* unz_global_info structure contain global data about the ZIPfile
   These data comes from the end of central dir */
typedef struct {
	uLong number_entry;         /* total number of entries in
				       the central dir on this disk */
	uLong size_comment;         /* size of the global comment of the zipfile */
} unz_global_info;


/* unz_file_info contain information about a file in the zipfile */
typedef struct {
    uLong version;              /* version made by                 2 bytes */
    uLong version_needed;       /* version needed to extract       2 bytes */
    uLong flag;                 /* general purpose bit flag        2 bytes */
    uLong compression_method;   /* compression method              2 bytes */
    uLong dosDate;              /* last mod file date in Dos fmt   4 bytes */
    uLong crc;                  /* crc-32                          4 bytes */
    uLong compressed_size;      /* compressed size                 4 bytes */
    uLong uncompressed_size;    /* uncompressed size               4 bytes */
    uLong size_filename;        /* filename length                 2 bytes */
    uLong size_file_extra;      /* extra field length              2 bytes */
    uLong size_file_comment;    /* file comment length             2 bytes */

    uLong disk_num_start;       /* disk number start               2 bytes */
    uLong internal_fa;          /* internal file attributes        2 bytes */
    uLong external_fa;          /* external file attributes        4 bytes */

    tm_unz tmu_date;
} unz_file_info;

int unzStringFileNameCompare(const char* fileName1,
												 const char* fileName2,
												 int iCaseSensitivity);
/*
   Compare two filename (fileName1,fileName2).
   If iCaseSenisivity = 1, comparision is case sensitivity (like strcmp)
   If iCaseSenisivity = 2, comparision is not case sensitivity (like strcmpi
								or strcasecmp)
   If iCaseSenisivity = 0, case sensitivity is defaut of your operating system
	(like 1 on Unix, 2 on Windows)
*/


/*
  Open a Zip file. path contain the full pathname (by example,
     on a Windows NT computer "c:\\zlib\\zlib111.zip" or on an Unix computer
	 "zlib/zlib111.zip".
	 If the zipfile cannot be opened (file don't exist or in not valid), the
	   return value is NULL.
     Else, the return value is a unzFile Handle, usable with other function
	   of this unzip package.
*/

int unzClose(unzFile file);
/*
  Close a ZipFile opened with unzipOpen.
  If there is files inside the .Zip opened with unzOpenCurrentFile (see later),
    these files MUST be closed with unzipCloseCurrentFile before call unzipClose.
  return UNZ_OK if there is no problem. */

int unzGetGlobalInfo(unzFile file,
					unz_global_info *pglobal_info);
/*
  Write info about the ZipFile in the *pglobal_info structure.
  No preparation of the structure is needed
  return UNZ_OK if there is no problem. */


int unzGetGlobalComment(unzFile file, char *szComment, uLong uSizeBuf);
/*
  Get the global comment string of the ZipFile, in the szComment buffer.
  uSizeBuf is the size of the szComment buffer.
  return the number of byte copied or an error code <0
*/


/***************************************************************************/
/* Unzip package allow you browse the directory of the zipfile */

int unzGoToFirstFile(unzFile file);
/*
  Set the current file of the zipfile to the first file.
  return UNZ_OK if there is no problem
*/

int unzGoToNextFile(unzFile file);
/*
  Set the current file of the zipfile to the next file.
  return UNZ_OK if there is no problem
  return UNZ_END_OF_LIST_OF_FILE if the actual file was the latest.
*/

int unzLocateFile(unzFile file, const char *szFileName, int iCaseSensitivity);
/*
  Try locate the file szFileName in the zipfile.
  For the iCaseSensitivity signification, see unzStringFileNameCompare

  return value :
  UNZ_OK if the file is found. It becomes the current file.
  UNZ_END_OF_LIST_OF_FILE if the file is not found
*/


int unzGetCurrentFileInfo(unzFile file,
					     unz_file_info *pfile_info,
					     char *szFileName,
					     uLong fileNameBufferSize,
					     void *extraField,
					     uLong extraFieldBufferSize,
					     char *szComment,
					     uLong commentBufferSize);
/*
  Get Info about the current file
  if pfile_info!=NULL, the *pfile_info structure will contain somes info about
	    the current file
  if szFileName!=NULL, the filemane string will be copied in szFileName
			(fileNameBufferSize is the size of the buffer)
  if extraField!=NULL, the extra field information will be copied in extraField
			(extraFieldBufferSize is the size of the buffer).
			This is the Central-header version of the extra field
  if szComment!=NULL, the comment string of the file will be copied in szComment
			(commentBufferSize is the size of the buffer)
*/

/***************************************************************************/
/* for reading the content of the current zipfile, you can open it, read data
   from it, and close it (you can close it before reading all the file)
   */

int unzOpenCurrentFile(unzFile file);
/*
  Open for reading data the current file in the zipfile.
  If there is no error, the return value is UNZ_OK.
*/

int unzCloseCurrentFile(unzFile file);
/*
  Close the file in zip opened with unzOpenCurrentFile
  Return UNZ_CRCERROR if all the file was read but the CRC is not good
*/


int unzReadCurrentFile(unzFile file, voidp buf, unsigned len);
/*
  Read bytes from the current file (opened by unzOpenCurrentFile)
  buf contain buffer where data must be copied
  len the size of buf.

  return the number of byte copied if somes bytes are copied
  return 0 if the end of file was reached
  return <0 with error code if there is an error
    (UNZ_ERRNO for IO error, or zLib error for uncompress error)
*/

z_off_t unztell(unzFile file);
/*
  Give the current position in uncompressed data
*/

int unzeof(unzFile file);
/*
  return 1 if the end of file was reached, 0 elsewhere
*/

int unzGetLocalExtrafield(unzFile file, voidp buf, unsigned len);
/*
  Read extra field from the current file (opened by unzOpenCurrentFile)
  This is the local-header version of the extra field (sometimes, there is
    more info in the local-header version than in the central-header)

  if buf==NULL, it return the size of the local extra field

  if buf!=NULL, len is the size of the buffer, the extra header is copied in
	buf.
  the return value is the number of bytes copied in buf, or (if <0)
	the error code
*/

#if !defined(unix) && !defined(CASESENSITIVITYDEFAULT_YES) && \
                      !defined(CASESENSITIVITYDEFAULT_NO)
#define CASESENSITIVITYDEFAULT_NO
#endif


#ifndef UNZ_BUFSIZE
#define UNZ_BUFSIZE (16384)
#endif

#ifndef UNZ_MAXFILENAMEINZIP
#define UNZ_MAXFILENAMEINZIP (256)
#endif

#define SIZECENTRALDIRITEM (0x2e)
#define SIZEZIPLOCALHEADER (0x1e)


const char unz_copyright[] =
   " unzip 0.15 Copyright 1998 Gilles Vollant ";

/* unz_file_info_interntal contain internal info about a file in zipfile*/
typedef struct {
    uLong offset_curfile;/* relative offset of local header 4 bytes */
} unz_file_info_internal;


/* file_in_zip_read_info_s contain internal information about a file in zipfile,
    when reading and decompress it */
typedef struct {
	char  *read_buffer;         /* internal buffer for compressed data */
	z_stream stream;            /* zLib stream structure for inflate */

	uLong pos_in_zipfile;       /* position in byte on the zipfile, for fseek*/
	uLong stream_initialized;   /* flag set if stream structure is initialized*/

	uLong offset_local_extrafield;/* offset of the local extra field */
	uInt  size_local_extrafield;/* size of the local extra field */
	uLong pos_local_extrafield;   /* position in the local extra field in read*/

	uLong crc32_data;                /* crc32 of all data uncompressed */
	uLong crc32_wait;           /* crc32 we must obtain after decompress all */
	uLong rest_read_compressed; /* number of byte to be decompressed */
	uLong rest_read_uncompressed;/*number of byte to be obtained after decomp*/
	Common::SeekableReadStream *_stream;                 /* io structore of the zipfile */
	uLong compression_method;   /* compression method (0==store) */
	uLong byte_before_the_zipfile;/* byte before the zipfile, (>0 for sfx)*/
} file_in_zip_read_info_s;

typedef struct {
	uLong num_file;					/* number of the current file in the zipfile*/
	uLong pos_in_central_dir;		/* pos of the current file in the central dir*/
	uLong current_file_ok;			/* flag about the usability of the current file*/
	unz_file_info cur_file_info;					/* public info about the current file in zip*/
	unz_file_info_internal cur_file_info_internal;	/* private info about it*/
} cached_file_in_zip;

typedef Common::HashMap<Common::String, cached_file_in_zip, Common::IgnoreCase_Hash,
	Common::IgnoreCase_EqualTo> ZipHash;

/* unz_s contain internal information about the zipfile
*/
typedef struct {
	Common::SeekableReadStream *_stream;				/* io structore of the zipfile */
	unz_global_info gi;				/* public global information */
	uLong byte_before_the_zipfile;	/* byte before the zipfile, (>0 for sfx)*/
	uLong num_file;					/* number of the current file in the zipfile*/
	uLong pos_in_central_dir;		/* pos of the current file in the central dir*/
	uLong current_file_ok;			/* flag about the usability of the current file*/
	uLong central_pos;				/* position of the beginning of the central dir*/

	uLong size_central_dir;			/* size of the central directory  */
	uLong offset_central_dir;		/* offset of start of central directory with
									respect to the starting disk number */

	unz_file_info cur_file_info;					/* public info about the current file in zip*/
	unz_file_info_internal cur_file_info_internal;	/* private info about it*/
	file_in_zip_read_info_s* pfile_in_zip_read;		/* structure about the current
													file if we are decompressing it */
	ZipHash _hash;
} unz_s;

/* ===========================================================================
     Read a byte from a gz_stream; update next_in and avail_in. Return EOF
   for end of file.
   IN assertion: the stream s has been successfully opened for reading.
*/


/*static int unzlocal_getByte(Common::SeekableReadStream &fin, int *pi) {
    unsigned char c = fin.readByte();
      *pi = (int)c;
        return UNZ_OK;
    } else {
        if (fin.err())
            return UNZ_ERRNO;
        else
            return UNZ_EOF;
    }
}*/


/* ===========================================================================
   Reads a long in LSB order from the given gz_stream. Sets
*/
static int unzlocal_getShort(Common::SeekableReadStream *fin, uLong *pX) {
	*pX = fin->readUint16LE();
	return (fin->err() || fin->eos()) ? UNZ_ERRNO : UNZ_OK;
}

static int unzlocal_getLong(Common::SeekableReadStream *fin, uLong *pX) {
	*pX = fin->readUint32LE();
	return (fin->err() || fin->eos()) ? UNZ_ERRNO : UNZ_OK;
}


#ifdef  CASESENSITIVITYDEFAULT_NO
#define CASESENSITIVITYDEFAULTVALUE 2
#else
#define CASESENSITIVITYDEFAULTVALUE 1
#endif

/*
   Compare two filename (fileName1,fileName2).
   If iCaseSenisivity = 1, comparision is case sensitivity (like strcmp)
   If iCaseSenisivity = 2, comparision is not case sensitivity (like strcmpi
                                                                or strcasecmp)
   If iCaseSenisivity = 0, case sensitivity is defaut of your operating system
        (like 1 on Unix, 2 on Windows)

*/
int unzStringFileNameCompare(const char* fileName1, const char* fileName2, int iCaseSensitivity) {
	if (iCaseSensitivity==0)
		iCaseSensitivity=CASESENSITIVITYDEFAULTVALUE;

	if (iCaseSensitivity==1)
		return strcmp(fileName1,fileName2);

	return scumm_stricmp(fileName1,fileName2);
}

#define BUFREADCOMMENT (0x400)

/*
  Locate the Central directory of a zipfile (at the end, just before
    the global comment)
*/
static uLong unzlocal_SearchCentralDir(Common::SeekableReadStream &fin) {
	unsigned char* buf;
	uLong uSizeFile;
	uLong uBackRead;
	uLong uMaxBack=0xffff; /* maximum size of global comment */
	uLong uPosFound=0;

	uSizeFile = fin.size();
	if (fin.err())
		return 0;

	if (uMaxBack>uSizeFile)
		uMaxBack = uSizeFile;

	buf = (unsigned char*)malloc(BUFREADCOMMENT+4);
	if (buf==NULL)
		return 0;

	uBackRead = 4;
	while (uBackRead<uMaxBack) {
		uLong uReadSize,uReadPos ;
		int i;
		if (uBackRead+BUFREADCOMMENT>uMaxBack)
			uBackRead = uMaxBack;
		else
			uBackRead+=BUFREADCOMMENT;
		uReadPos = uSizeFile-uBackRead ;

		uReadSize = ((BUFREADCOMMENT+4) < (uSizeFile-uReadPos)) ?
                     (BUFREADCOMMENT+4) : (uSizeFile-uReadPos);
		fin.seek(uReadPos, SEEK_SET);
		if (fin.err())
			break;

		if (fin.read(buf,(uInt)uReadSize)!=uReadSize)
			break;

                for (i=(int)uReadSize-3; (i--)>0;)
			if (((*(buf+i))==0x50) && ((*(buf+i+1))==0x4b) &&
				((*(buf+i+2))==0x05) && ((*(buf+i+3))==0x06))
			{
				uPosFound = uReadPos+i;
				break;
			}

		if (uPosFound!=0)
			break;
	}
	free(buf);
	return uPosFound;
}

/*
  Open a Zip file. path contain the full pathname (by example,
     on a Windows NT computer "c:\\test\\zlib109.zip" or on an Unix computer
	 "zlib/zlib109.zip".
	 If the zipfile cannot be opened (file don't exist or in not valid), the
	   return value is NULL.
     Else, the return value is a unzFile Handle, usable with other function
	   of this unzip package.
*/
unzFile unzOpen(Common::SeekableReadStream *stream) {
	if (!stream)
		return NULL;

	unz_s *us = new unz_s;
	uLong central_pos,uL;

	uLong number_disk;          /* number of the current dist, used for
								   spaning ZIP, unsupported, always 0*/
	uLong number_disk_with_CD;  /* number the the disk with central dir, used
								   for spaning ZIP, unsupported, always 0*/
	uLong number_entry_CD;      /* total number of entries in
	                               the central dir
	                               (same than number_entry on nospan) */

	int err=UNZ_OK;

	us->_stream = stream;

	central_pos = unzlocal_SearchCentralDir(*us->_stream);
	if (central_pos==0)
		err=UNZ_ERRNO;

	us->_stream->seek(central_pos, SEEK_SET);
	if (us->_stream->err())
		err=UNZ_ERRNO;

	/* the signature, already checked */
	if (unzlocal_getLong(us->_stream,&uL)!=UNZ_OK)
		err=UNZ_ERRNO;

	/* number of this disk */
	if (unzlocal_getShort(us->_stream,&number_disk)!=UNZ_OK)
		err=UNZ_ERRNO;

	/* number of the disk with the start of the central directory */
	if (unzlocal_getShort(us->_stream,&number_disk_with_CD)!=UNZ_OK)
		err=UNZ_ERRNO;

	/* total number of entries in the central dir on this disk */
	if (unzlocal_getShort(us->_stream,&us->gi.number_entry)!=UNZ_OK)
		err=UNZ_ERRNO;

	/* total number of entries in the central dir */
	if (unzlocal_getShort(us->_stream,&number_entry_CD)!=UNZ_OK)
		err=UNZ_ERRNO;

	if ((number_entry_CD!=us->gi.number_entry) ||
	    (number_disk_with_CD!=0) ||
	    (number_disk!=0))
		err=UNZ_BADZIPFILE;

	/* size of the central directory */
	if (unzlocal_getLong(us->_stream,&us->size_central_dir)!=UNZ_OK)
		err=UNZ_ERRNO;

	/* offset of start of central directory with respect to the
	      starting disk number */
	if (unzlocal_getLong(us->_stream,&us->offset_central_dir)!=UNZ_OK)
		err=UNZ_ERRNO;

	/* zipfile comment length */
	if (unzlocal_getShort(us->_stream,&us->gi.size_comment)!=UNZ_OK)
		err=UNZ_ERRNO;

	if ((central_pos<us->offset_central_dir+us->size_central_dir) && (err==UNZ_OK))
		err=UNZ_BADZIPFILE;

	if (err != UNZ_OK) {
		delete us->_stream;
		delete us;
		return NULL;
	}

	us->byte_before_the_zipfile = central_pos -
		                    (us->offset_central_dir+us->size_central_dir);
	us->central_pos = central_pos;
	us->pfile_in_zip_read = NULL;

	err = unzGoToFirstFile((unzFile)us);

	while (err == UNZ_OK) {
		// Get the file details
		char szCurrentFileName[UNZ_MAXFILENAMEINZIP+1];
		unzGetCurrentFileInfo(us, NULL, szCurrentFileName, sizeof(szCurrentFileName) - 1,
							NULL, 0, NULL, 0);

		// Save details into the hash
		cached_file_in_zip fe;
		fe.num_file = us->num_file;
		fe.pos_in_central_dir = us->pos_in_central_dir;
		fe.current_file_ok = us->current_file_ok;
		fe.cur_file_info = us->cur_file_info;
		fe.cur_file_info_internal = us->cur_file_info_internal;

		us->_hash[Common::String(szCurrentFileName)] = fe;

		// Move to the next file
		err = unzGoToNextFile((unzFile)us);
	}
	return (unzFile)us;
}


/*
  Close a ZipFile opened with unzipOpen.
  If there is files inside the .Zip opened with unzipOpenCurrentFile (see later),
    these files MUST be closed with unzipCloseCurrentFile before call unzipClose.
  return UNZ_OK if there is no problem. */
int unzClose(unzFile file) {
	unz_s *s;
	if (file == NULL)
		return UNZ_PARAMERROR;
	s = (unz_s *)file;

	if (s->pfile_in_zip_read != NULL)
		unzCloseCurrentFile(file);

	delete s->_stream;
	delete s;
	return UNZ_OK;
}


/*
  Write info about the ZipFile in the *pglobal_info structure.
  No preparation of the structure is needed
  return UNZ_OK if there is no problem. */
int unzGetGlobalInfo(unzFile file, unz_global_info *pglobal_info) {
	unz_s *s;
	if (file == NULL)
		return UNZ_PARAMERROR;
	s = (unz_s *)file;
	*pglobal_info = s->gi;
	return UNZ_OK;
}


/*
   Translate date/time from Dos format to tm_unz (readable more easilty)
*/
static void unzlocal_DosDateToTmuDate(uLong ulDosDate, tm_unz* ptm) {
	uLong uDate;
	uDate = (uLong)(ulDosDate>>16);
	ptm->tm_mday = (uInt)(uDate&0x1f) ;
	ptm->tm_mon =  (uInt)((((uDate)&0x1E0)/0x20)-1) ;
	ptm->tm_year = (uInt)(((uDate&0x0FE00)/0x0200)+1980) ;

	ptm->tm_hour = (uInt) ((ulDosDate &0xF800)/0x800);
	ptm->tm_min =  (uInt) ((ulDosDate&0x7E0)/0x20) ;
	ptm->tm_sec =  (uInt) (2*(ulDosDate&0x1f)) ;
}

/*
  Get Info about the current file in the zipfile, with internal only info
*/
static int unzlocal_GetCurrentFileInfoInternal(unzFile file,
                                                  unz_file_info *pfile_info,
                                                  unz_file_info_internal
                                                  *pfile_info_internal,
                                                  char *szFileName,
												  uLong fileNameBufferSize,
                                                  void *extraField,
												  uLong extraFieldBufferSize,
                                                  char *szComment,
												  uLong commentBufferSize);

static int unzlocal_GetCurrentFileInfoInternal(unzFile file,
                                              unz_file_info *pfile_info,
                                              unz_file_info_internal *pfile_info_internal,
                                              char *szFileName, uLong fileNameBufferSize,
                                              void *extraField, uLong extraFieldBufferSize,
                                              char *szComment,  uLong commentBufferSize)
{
	unz_s* s;
	unz_file_info file_info;
	unz_file_info_internal file_info_internal;
	int err=UNZ_OK;
	uLong uMagic;
	long lSeek=0;

	if (file==NULL)
		return UNZ_PARAMERROR;
	s=(unz_s*)file;
	s->_stream->seek(s->pos_in_central_dir+s->byte_before_the_zipfile, SEEK_SET);
	if (s->_stream->err())
		err=UNZ_ERRNO;


	/* we check the magic */
	if (err==UNZ_OK) {
		if (unzlocal_getLong(s->_stream,&uMagic) != UNZ_OK)
			err=UNZ_ERRNO;
		else if (uMagic!=0x02014b50)
			err=UNZ_BADZIPFILE;
	}

	if (unzlocal_getShort(s->_stream,&file_info.version) != UNZ_OK)
		err=UNZ_ERRNO;

	if (unzlocal_getShort(s->_stream,&file_info.version_needed) != UNZ_OK)
		err=UNZ_ERRNO;

	if (unzlocal_getShort(s->_stream,&file_info.flag) != UNZ_OK)
		err=UNZ_ERRNO;

	if (unzlocal_getShort(s->_stream,&file_info.compression_method) != UNZ_OK)
		err=UNZ_ERRNO;

	if (unzlocal_getLong(s->_stream,&file_info.dosDate) != UNZ_OK)
		err=UNZ_ERRNO;

	unzlocal_DosDateToTmuDate(file_info.dosDate,&file_info.tmu_date);

	if (unzlocal_getLong(s->_stream,&file_info.crc) != UNZ_OK)
		err=UNZ_ERRNO;

	if (unzlocal_getLong(s->_stream,&file_info.compressed_size) != UNZ_OK)
		err=UNZ_ERRNO;

	if (unzlocal_getLong(s->_stream,&file_info.uncompressed_size) != UNZ_OK)
		err=UNZ_ERRNO;

	if (unzlocal_getShort(s->_stream,&file_info.size_filename) != UNZ_OK)
		err=UNZ_ERRNO;

	if (unzlocal_getShort(s->_stream,&file_info.size_file_extra) != UNZ_OK)
		err=UNZ_ERRNO;

	if (unzlocal_getShort(s->_stream,&file_info.size_file_comment) != UNZ_OK)
		err=UNZ_ERRNO;

	if (unzlocal_getShort(s->_stream,&file_info.disk_num_start) != UNZ_OK)
		err=UNZ_ERRNO;

	if (unzlocal_getShort(s->_stream,&file_info.internal_fa) != UNZ_OK)
		err=UNZ_ERRNO;

	if (unzlocal_getLong(s->_stream,&file_info.external_fa) != UNZ_OK)
		err=UNZ_ERRNO;

	if (unzlocal_getLong(s->_stream,&file_info_internal.offset_curfile) != UNZ_OK)
		err=UNZ_ERRNO;

	lSeek+=file_info.size_filename;
	if ((err==UNZ_OK) && (szFileName!=NULL)) {
		uLong uSizeRead ;
		if (file_info.size_filename<fileNameBufferSize) {
			*(szFileName+file_info.size_filename)='\0';
			uSizeRead = file_info.size_filename;
		} else
			uSizeRead = fileNameBufferSize;

		if ((file_info.size_filename>0) && (fileNameBufferSize>0))
			if (s->_stream->read(szFileName,(uInt)uSizeRead)!=uSizeRead)
				err=UNZ_ERRNO;
		lSeek -= uSizeRead;
	}


	if ((err==UNZ_OK) && (extraField!=NULL)) {
		uLong uSizeRead ;
		if (file_info.size_file_extra<extraFieldBufferSize)
			uSizeRead = file_info.size_file_extra;
		else
			uSizeRead = extraFieldBufferSize;

		if (lSeek!=0) {
			s->_stream->seek(lSeek, SEEK_CUR);
			if (s->_stream->err())
				lSeek=0;
			else
				err=UNZ_ERRNO;
		}
		if ((file_info.size_file_extra>0) && (extraFieldBufferSize>0))
			if (s->_stream->read(extraField,(uInt)uSizeRead)!=uSizeRead)
				err=UNZ_ERRNO;
		lSeek += file_info.size_file_extra - uSizeRead;
	}
	else
		lSeek+=file_info.size_file_extra;


	if ((err==UNZ_OK) && (szComment!=NULL)) {
		uLong uSizeRead ;
		if (file_info.size_file_comment<commentBufferSize) {
			*(szComment+file_info.size_file_comment)='\0';
			uSizeRead = file_info.size_file_comment;
		} else
			uSizeRead = commentBufferSize;

		if (lSeek!=0) {
			s->_stream->seek(lSeek, SEEK_CUR);
			if (s->_stream->err())
				lSeek=0;
			else
				err=UNZ_ERRNO;
		}
		if ((file_info.size_file_comment>0) && (commentBufferSize>0))
			if (s->_stream->read(szComment,(uInt)uSizeRead)!=uSizeRead)
				err=UNZ_ERRNO;
		lSeek+=file_info.size_file_comment - uSizeRead;
	} else
		lSeek+=file_info.size_file_comment;

	if ((err==UNZ_OK) && (pfile_info!=NULL))
		*pfile_info=file_info;

	if ((err==UNZ_OK) && (pfile_info_internal!=NULL))
		*pfile_info_internal=file_info_internal;

	return err;
}



/*
  Write info about the ZipFile in the *pglobal_info structure.
  No preparation of the structure is needed
  return UNZ_OK if there is no problem.
*/
int unzGetCurrentFileInfo(unzFile file,
                                                  unz_file_info *pfile_info,
                                                  char *szFileName, uLong fileNameBufferSize,
                                                  void *extraField, uLong extraFieldBufferSize,
                                                  char *szComment,  uLong commentBufferSize)
{
	return unzlocal_GetCurrentFileInfoInternal(file,pfile_info,NULL,
												szFileName,fileNameBufferSize,
												extraField,extraFieldBufferSize,
												szComment,commentBufferSize);
}

/*
  Set the current file of the zipfile to the first file.
  return UNZ_OK if there is no problem
*/
int unzGoToFirstFile(unzFile file) {
	int err=UNZ_OK;
	unz_s* s;
	if (file==NULL)
		return UNZ_PARAMERROR;
	s=(unz_s*)file;
	s->pos_in_central_dir=s->offset_central_dir;
	s->num_file=0;
	err=unzlocal_GetCurrentFileInfoInternal(file,&s->cur_file_info,
											 &s->cur_file_info_internal,
											 NULL,0,NULL,0,NULL,0);
	s->current_file_ok = (err == UNZ_OK);
	return err;
}


/*
  Set the current file of the zipfile to the next file.
  return UNZ_OK if there is no problem
  return UNZ_END_OF_LIST_OF_FILE if the actual file was the latest.
*/
int unzGoToNextFile(unzFile file) {
	unz_s* s;
	int err;

	if (file==NULL)
		return UNZ_PARAMERROR;
	s=(unz_s*)file;
	if (!s->current_file_ok)
		return UNZ_END_OF_LIST_OF_FILE;
	if (s->num_file+1==s->gi.number_entry)
		return UNZ_END_OF_LIST_OF_FILE;

	s->pos_in_central_dir += SIZECENTRALDIRITEM + s->cur_file_info.size_filename +
			s->cur_file_info.size_file_extra + s->cur_file_info.size_file_comment ;
	s->num_file++;
	err = unzlocal_GetCurrentFileInfoInternal(file,&s->cur_file_info,
											   &s->cur_file_info_internal,
											   NULL,0,NULL,0,NULL,0);
	s->current_file_ok = (err == UNZ_OK);
	return err;
}

/*
  Try locate the file szFileName in the zipfile.
  For the iCaseSensitivity signification, see unzipStringFileNameCompare

  return value :
  UNZ_OK if the file is found. It becomes the current file.
  UNZ_END_OF_LIST_OF_FILE if the file is not found
*/
int unzLocateFile(unzFile file, const char *szFileName, int iCaseSensitivity) {
	unz_s* s;

	if (file==NULL)
		return UNZ_PARAMERROR;

	if (strlen(szFileName)>=UNZ_MAXFILENAMEINZIP)
		return UNZ_PARAMERROR;

	s=(unz_s*)file;
	if (!s->current_file_ok)
		return UNZ_END_OF_LIST_OF_FILE;

	// Check to see if the entry exists
	ZipHash::iterator i = s->_hash.find(Common::String(szFileName));
	if (i == s->_hash.end())
		return UNZ_END_OF_LIST_OF_FILE;

	// Found it, so reset the details in the main structure
	cached_file_in_zip &fe = i->_value;
	s->num_file = fe.num_file;
	s->pos_in_central_dir = fe.pos_in_central_dir;
	s->current_file_ok = fe.current_file_ok;
	s->cur_file_info = fe.cur_file_info;
	s->cur_file_info_internal = fe.cur_file_info_internal;

	return UNZ_OK;
}


/*
  Read the local header of the current zipfile
  Check the coherency of the local header and info in the end of central
        directory about this file
  store in *piSizeVar the size of extra info in local header
        (filename and size of extra field data)
*/
static int unzlocal_CheckCurrentFileCoherencyHeader(unz_s* s, uInt* piSizeVar,
													uLong *poffset_local_extrafield,
													uInt  *psize_local_extrafield) {
	uLong uMagic,uData,uFlags;
	uLong size_filename;
	uLong size_extra_field;
	int err=UNZ_OK;

	*piSizeVar = 0;
	*poffset_local_extrafield = 0;
	*psize_local_extrafield = 0;

	s->_stream->seek(s->cur_file_info_internal.offset_curfile +
								s->byte_before_the_zipfile, SEEK_SET);
	if (s->_stream->err())
		return UNZ_ERRNO;


	if (err==UNZ_OK) {
		if (unzlocal_getLong(s->_stream,&uMagic) != UNZ_OK)
			err=UNZ_ERRNO;
		else if (uMagic!=0x04034b50)
			err=UNZ_BADZIPFILE;
	}

	if (unzlocal_getShort(s->_stream,&uData) != UNZ_OK)
		err=UNZ_ERRNO;
/*
	else if ((err==UNZ_OK) && (uData!=s->cur_file_info.wVersion))
		err=UNZ_BADZIPFILE;
*/
	if (unzlocal_getShort(s->_stream,&uFlags) != UNZ_OK)
		err=UNZ_ERRNO;

	if (unzlocal_getShort(s->_stream,&uData) != UNZ_OK)
		err=UNZ_ERRNO;
	else if ((err==UNZ_OK) && (uData!=s->cur_file_info.compression_method))
		err=UNZ_BADZIPFILE;

	if ((err==UNZ_OK) && (s->cur_file_info.compression_method!=0) &&
	                     (s->cur_file_info.compression_method!=Z_DEFLATED))
		err=UNZ_BADZIPFILE;

	if (unzlocal_getLong(s->_stream,&uData) != UNZ_OK) /* date/time */
		err=UNZ_ERRNO;

	if (unzlocal_getLong(s->_stream,&uData) != UNZ_OK) /* crc */
		err=UNZ_ERRNO;
	else if ((err==UNZ_OK) && (uData!=s->cur_file_info.crc) &&
		                      ((uFlags & 8)==0))
		err=UNZ_BADZIPFILE;

	if (unzlocal_getLong(s->_stream,&uData) != UNZ_OK) /* size compr */
		err=UNZ_ERRNO;
	else if ((err==UNZ_OK) && (uData!=s->cur_file_info.compressed_size) &&
							  ((uFlags & 8)==0))
		err=UNZ_BADZIPFILE;

	if (unzlocal_getLong(s->_stream,&uData) != UNZ_OK) /* size uncompr */
		err=UNZ_ERRNO;
	else if ((err==UNZ_OK) && (uData!=s->cur_file_info.uncompressed_size) &&
							  ((uFlags & 8)==0))
		err=UNZ_BADZIPFILE;


	if (unzlocal_getShort(s->_stream,&size_filename) != UNZ_OK)
		err=UNZ_ERRNO;
	else if ((err==UNZ_OK) && (size_filename!=s->cur_file_info.size_filename))
		err=UNZ_BADZIPFILE;

	*piSizeVar += (uInt)size_filename;

	if (unzlocal_getShort(s->_stream,&size_extra_field) != UNZ_OK)
		err=UNZ_ERRNO;
	*poffset_local_extrafield= s->cur_file_info_internal.offset_curfile +
									SIZEZIPLOCALHEADER + size_filename;
	*psize_local_extrafield = (uInt)size_extra_field;

	*piSizeVar += (uInt)size_extra_field;

	return err;
}

/*
  Open for reading data the current file in the zipfile.
  If there is no error and the file is opened, the return value is UNZ_OK.
*/
int unzOpenCurrentFile (unzFile file) {
	int err=UNZ_OK;
	int Store;
	uInt iSizeVar;
	unz_s* s;
	file_in_zip_read_info_s* pfile_in_zip_read_info;
	uLong offset_local_extrafield;  /* offset of the local extra field */
	uInt  size_local_extrafield;    /* size of the local extra field */

	if (file==NULL)
		return UNZ_PARAMERROR;
	s=(unz_s*)file;
	if (!s->current_file_ok)
		return UNZ_PARAMERROR;

	if (s->pfile_in_zip_read != NULL)
		unzCloseCurrentFile(file);

	if (unzlocal_CheckCurrentFileCoherencyHeader(s,&iSizeVar,
				&offset_local_extrafield,&size_local_extrafield)!=UNZ_OK)
		return UNZ_BADZIPFILE;

	pfile_in_zip_read_info = (file_in_zip_read_info_s*) malloc(sizeof(file_in_zip_read_info_s));

	if (pfile_in_zip_read_info==NULL)
		return UNZ_INTERNALERROR;

	pfile_in_zip_read_info->read_buffer=(char*)malloc(UNZ_BUFSIZE);
	pfile_in_zip_read_info->offset_local_extrafield = offset_local_extrafield;
	pfile_in_zip_read_info->size_local_extrafield = size_local_extrafield;
	pfile_in_zip_read_info->pos_local_extrafield=0;

	if (pfile_in_zip_read_info->read_buffer==NULL)
	{
		free(pfile_in_zip_read_info);
		return UNZ_INTERNALERROR;
	}

	pfile_in_zip_read_info->stream_initialized=0;

	if ((s->cur_file_info.compression_method!=0) &&
	    (s->cur_file_info.compression_method!=Z_DEFLATED))
		err=UNZ_BADZIPFILE;
	Store = s->cur_file_info.compression_method==0;

	pfile_in_zip_read_info->crc32_wait=s->cur_file_info.crc;
	pfile_in_zip_read_info->crc32_data=0;
	pfile_in_zip_read_info->compression_method = s->cur_file_info.compression_method;
	pfile_in_zip_read_info->_stream=s->_stream;
	pfile_in_zip_read_info->byte_before_the_zipfile=s->byte_before_the_zipfile;

	pfile_in_zip_read_info->stream.total_out = 0;

	if (!Store) {
#ifdef USE_ZLIB
		pfile_in_zip_read_info->stream.zalloc = (alloc_func)0;
		pfile_in_zip_read_info->stream.zfree = (free_func)0;
		pfile_in_zip_read_info->stream.opaque = (voidpf)0;

		err=inflateInit2(&pfile_in_zip_read_info->stream, -MAX_WBITS);
		if (err == Z_OK)
			pfile_in_zip_read_info->stream_initialized = 1;
	/* windowBits is passed < 0 to tell that there is no zlib header.
	 * Note that in this case inflate *requires* an extra "dummy" byte
	 * after the compressed stream in order to complete decompression and
	 * return Z_STREAM_END.
	 * In unzip, i don't wait absolutely Z_STREAM_END because I known the
	 * size of both compressed and uncompressed data
	 */
#else
		err=UNZ_BADZIPFILE;
#endif
	}
	pfile_in_zip_read_info->rest_read_compressed = s->cur_file_info.compressed_size;
	pfile_in_zip_read_info->rest_read_uncompressed = s->cur_file_info.uncompressed_size;


	pfile_in_zip_read_info->pos_in_zipfile =
		s->cur_file_info_internal.offset_curfile + SIZEZIPLOCALHEADER + iSizeVar;

	pfile_in_zip_read_info->stream.avail_in = (uInt)0;

	s->pfile_in_zip_read = pfile_in_zip_read_info;
	return err;
}


/*
  Read bytes from the current file.
  buf contain buffer where data must be copied
  len the size of buf.

  return the number of byte copied if somes bytes are copied
  return 0 if the end of file was reached
  return <0 with error code if there is an error
    (UNZ_ERRNO for IO error, or zLib error for uncompress error)
*/
int unzReadCurrentFile(unzFile file, voidp buf, unsigned len) {
	int err=UNZ_OK;
	uInt iRead = 0;
	unz_s* s;
	file_in_zip_read_info_s* pfile_in_zip_read_info;
	if (file==NULL)
		return UNZ_PARAMERROR;
	s=(unz_s*)file;
	pfile_in_zip_read_info=s->pfile_in_zip_read;

	if (pfile_in_zip_read_info==NULL)
		return UNZ_PARAMERROR;


	if (pfile_in_zip_read_info->read_buffer == NULL)
		return UNZ_END_OF_LIST_OF_FILE;
	if (len==0)
		return 0;

	pfile_in_zip_read_info->stream.next_out = (Bytef*)buf;

	pfile_in_zip_read_info->stream.avail_out = (uInt)len;

	if (len>pfile_in_zip_read_info->rest_read_uncompressed)
		pfile_in_zip_read_info->stream.avail_out =
		  (uInt)pfile_in_zip_read_info->rest_read_uncompressed;

	while (pfile_in_zip_read_info->stream.avail_out>0) {
		if ((pfile_in_zip_read_info->stream.avail_in==0) &&
		    (pfile_in_zip_read_info->rest_read_compressed>0)) {
			uInt uReadThis = UNZ_BUFSIZE;
			if (pfile_in_zip_read_info->rest_read_compressed<uReadThis)
				uReadThis = (uInt)pfile_in_zip_read_info->rest_read_compressed;
			if (uReadThis == 0)
				return UNZ_EOF;
			pfile_in_zip_read_info->_stream->seek(pfile_in_zip_read_info->pos_in_zipfile +
				pfile_in_zip_read_info->byte_before_the_zipfile, SEEK_SET);
			if (pfile_in_zip_read_info->_stream->err())
				return UNZ_ERRNO;
			if (pfile_in_zip_read_info->_stream->read(pfile_in_zip_read_info->read_buffer,uReadThis)!=uReadThis)
				return UNZ_ERRNO;
			pfile_in_zip_read_info->pos_in_zipfile += uReadThis;

			pfile_in_zip_read_info->rest_read_compressed-=uReadThis;

			pfile_in_zip_read_info->stream.next_in = (Bytef*)pfile_in_zip_read_info->read_buffer;
			pfile_in_zip_read_info->stream.avail_in = (uInt)uReadThis;
		}

		if (pfile_in_zip_read_info->compression_method==0) {
			uInt uDoCopy,i ;
			if (pfile_in_zip_read_info->stream.avail_out < pfile_in_zip_read_info->stream.avail_in)
				uDoCopy = pfile_in_zip_read_info->stream.avail_out ;
			else
				uDoCopy = pfile_in_zip_read_info->stream.avail_in ;

			for (i=0;i<uDoCopy;i++)
				*(pfile_in_zip_read_info->stream.next_out+i) = *(pfile_in_zip_read_info->stream.next_in+i);

#ifdef USE_ZLIB
			pfile_in_zip_read_info->crc32_data = crc32(pfile_in_zip_read_info->crc32_data,
								pfile_in_zip_read_info->stream.next_out,
								uDoCopy);
#endif  // otherwise leave crc32_data as is and it won't be verified at the end
			pfile_in_zip_read_info->rest_read_uncompressed-=uDoCopy;
			pfile_in_zip_read_info->stream.avail_in -= uDoCopy;
			pfile_in_zip_read_info->stream.avail_out -= uDoCopy;
			pfile_in_zip_read_info->stream.next_out += uDoCopy;
			pfile_in_zip_read_info->stream.next_in += uDoCopy;
			pfile_in_zip_read_info->stream.total_out += uDoCopy;
			iRead += uDoCopy;
		} else {
#ifdef USE_ZLIB
			uLong uTotalOutBefore,uTotalOutAfter;
			const Bytef *bufBefore;
			uLong uOutThis;
			int flush = Z_SYNC_FLUSH;

			uTotalOutBefore = pfile_in_zip_read_info->stream.total_out;
			bufBefore = pfile_in_zip_read_info->stream.next_out;

			/*
			if ((pfile_in_zip_read_info->rest_read_uncompressed ==
			         pfile_in_zip_read_info->stream.avail_out) &&
				(pfile_in_zip_read_info->rest_read_compressed == 0))
				flush = Z_FINISH;
			*/
			err=inflate(&pfile_in_zip_read_info->stream,flush);

			uTotalOutAfter = pfile_in_zip_read_info->stream.total_out;
			uOutThis = uTotalOutAfter-uTotalOutBefore;

			pfile_in_zip_read_info->crc32_data =
				crc32(pfile_in_zip_read_info->crc32_data,bufBefore, (uInt)(uOutThis));

			pfile_in_zip_read_info->rest_read_uncompressed -= uOutThis;

			iRead += (uInt)(uTotalOutAfter - uTotalOutBefore);

			if (err==Z_STREAM_END)
				return (iRead==0) ? UNZ_EOF : iRead;
			if (err!=Z_OK)
				break;
#else
			// Cannot decompress the file without zlib.
			err = UNZ_BADZIPFILE;
			break;
#endif
		}
	}

	if (err==Z_OK)
		return iRead;
	return err;
}


/*
  Give the current position in uncompressed data
*/
z_off_t unztell(unzFile file) {
	unz_s* s;
	file_in_zip_read_info_s* pfile_in_zip_read_info;
	if (file==NULL)
		return UNZ_PARAMERROR;
	s=(unz_s*)file;
	pfile_in_zip_read_info=s->pfile_in_zip_read;

	if (pfile_in_zip_read_info==NULL)
		return UNZ_PARAMERROR;

	return (z_off_t)pfile_in_zip_read_info->stream.total_out;
}


/*
  return 1 if the end of file was reached, 0 elsewhere
*/
int unzeof(unzFile file) {
	unz_s* s;
	file_in_zip_read_info_s* pfile_in_zip_read_info;
	if (file==NULL)
		return UNZ_PARAMERROR;
	s=(unz_s*)file;
	pfile_in_zip_read_info=s->pfile_in_zip_read;

	if (pfile_in_zip_read_info==NULL)
		return UNZ_PARAMERROR;

	if (pfile_in_zip_read_info->rest_read_uncompressed == 0)
		return 1;
	else
		return 0;
}



/*
  Read extra field from the current file (opened by unzOpenCurrentFile)
  This is the local-header version of the extra field (sometimes, there is
    more info in the local-header version than in the central-header)

  if buf==NULL, it return the size of the local extra field that can be read

  if buf!=NULL, len is the size of the buffer, the extra header is copied in
	buf.
  the return value is the number of bytes copied in buf, or (if <0)
	the error code
*/
int unzGetLocalExtrafield(unzFile file, voidp buf, unsigned len) {
	unz_s* s;
	file_in_zip_read_info_s* pfile_in_zip_read_info;
	uInt read_now;
	uLong size_to_read;

	if (file==NULL)
		return UNZ_PARAMERROR;
	s=(unz_s*)file;
	pfile_in_zip_read_info=s->pfile_in_zip_read;

	if (pfile_in_zip_read_info==NULL)
		return UNZ_PARAMERROR;

	size_to_read = (pfile_in_zip_read_info->size_local_extrafield -
				pfile_in_zip_read_info->pos_local_extrafield);

	if (buf==NULL)
		return (int)size_to_read;

	if (len>size_to_read)
		read_now = (uInt)size_to_read;
	else
		read_now = (uInt)len ;

	if (read_now==0)
		return 0;

	pfile_in_zip_read_info->_stream->seek(pfile_in_zip_read_info->offset_local_extrafield +
			  pfile_in_zip_read_info->pos_local_extrafield,SEEK_SET);
	if (pfile_in_zip_read_info->_stream->err())
		return UNZ_ERRNO;

	if (pfile_in_zip_read_info->_stream->read(buf,(uInt)size_to_read)!=size_to_read)
		return UNZ_ERRNO;

	return (int)read_now;
}

/*
  Close the file in zip opened with unzipOpenCurrentFile
  Return UNZ_CRCERROR if all the file was read but the CRC is not good
*/
int unzCloseCurrentFile(unzFile file) {
	int err=UNZ_OK;

	unz_s* s;
	file_in_zip_read_info_s* pfile_in_zip_read_info;
	if (file == NULL)
		return UNZ_PARAMERROR;
	s = (unz_s*)file;
	pfile_in_zip_read_info = s->pfile_in_zip_read;

	if (pfile_in_zip_read_info == NULL)
		return UNZ_PARAMERROR;


#ifdef USE_ZLIB
	// Only verify crc32_data when zlib is linked in, because otherwise crc32() is
	// not defined.
	if (pfile_in_zip_read_info->rest_read_uncompressed == 0) {
		if (pfile_in_zip_read_info->crc32_data != pfile_in_zip_read_info->crc32_wait)
			err=UNZ_CRCERROR;
	}
	if (pfile_in_zip_read_info->stream_initialized)
		inflateEnd(&pfile_in_zip_read_info->stream);
#endif


	free(pfile_in_zip_read_info->read_buffer);
	pfile_in_zip_read_info->read_buffer = NULL;

	pfile_in_zip_read_info->stream_initialized = 0;
	free(pfile_in_zip_read_info);

	s->pfile_in_zip_read=NULL;

	return err;
}


/*
  Get the global comment string of the ZipFile, in the szComment buffer.
  uSizeBuf is the size of the szComment buffer.
  return the number of byte copied or an error code <0
*/
int unzGetGlobalComment(unzFile file, char *szComment, uLong uSizeBuf) {
	unz_s* s;
	uLong uReadThis ;
	if (file==NULL)
		return UNZ_PARAMERROR;
	s=(unz_s*)file;

	uReadThis = uSizeBuf;
	if (uReadThis>s->gi.size_comment)
		uReadThis = s->gi.size_comment;

	s->_stream->seek(s->central_pos+22, SEEK_SET);
	if (s->_stream->err())
		return UNZ_ERRNO;

	if (uReadThis>0) {
		*szComment='\0';
		if (s->_stream->read(szComment,(uInt)uReadThis)!=uReadThis)
			return UNZ_ERRNO;
	}

	if ((szComment != NULL) && (uSizeBuf > s->gi.size_comment))
		*(szComment+s->gi.size_comment)='\0';
	return (int)uReadThis;
}


namespace Common {


class ZipArchive : public Archive {
	unzFile _zipFile;

public:
	ZipArchive(unzFile zipFile);


	~ZipArchive();

	virtual bool hasFile(const String &name) const;
	virtual int listMembers(ArchiveMemberList &list) const;
	virtual const ArchiveMemberPtr getMember(const String &name) const;
	virtual SeekableReadStream *createReadStreamForMember(const String &name) const;
};

/*
class ZipArchiveMember : public ArchiveMember {
	unzFile _zipFile;

public:
	ZipArchiveMember(FSNode &node) : _node(node) {
	}

	String getName() const {
		...
	}

	SeekableReadStream *open() {
		...
	}
};
*/

ZipArchive::ZipArchive(unzFile zipFile) : _zipFile(zipFile) {
	assert(_zipFile);
}

ZipArchive::~ZipArchive() {
	unzClose(_zipFile);
}

bool ZipArchive::hasFile(const String &name) const {
	return (unzLocateFile(_zipFile, name.c_str(), 2) == UNZ_OK);
}

int ZipArchive::listMembers(ArchiveMemberList &list) const {
	int matches = 0;
	int err = unzGoToFirstFile(_zipFile);

	while (err == UNZ_OK) {
		char szCurrentFileName[UNZ_MAXFILENAMEINZIP+1];
		if (unzGetCurrentFileInfo(_zipFile, NULL,
		                          szCurrentFileName, sizeof(szCurrentFileName)-1,
		                          NULL, 0, NULL, 0) == UNZ_OK) {
			list.push_back(ArchiveMemberList::value_type(new GenericArchiveMember(szCurrentFileName, this)));
			matches++;
		}

		err = unzGoToNextFile(_zipFile);
	}

	return matches;
}

const ArchiveMemberPtr ZipArchive::getMember(const String &name) const {
	if (!hasFile(name))
		return ArchiveMemberPtr();

	return ArchiveMemberPtr(new GenericArchiveMember(name, this));
}

SeekableReadStream *ZipArchive::createReadStreamForMember(const String &name) const {
	if (unzLocateFile(_zipFile, name.c_str(), 2) != UNZ_OK)
		return 0;

	unz_file_info fileInfo;
	if (unzOpenCurrentFile(_zipFile) != UNZ_OK)
		return 0;

	if (unzGetCurrentFileInfo(_zipFile, &fileInfo, NULL, 0, NULL, 0, NULL, 0) != UNZ_OK)
		return 0;

	byte *buffer = (byte *)malloc(fileInfo.uncompressed_size);
	assert(buffer);

	if (unzReadCurrentFile(_zipFile, buffer, fileInfo.uncompressed_size) != (int)fileInfo.uncompressed_size) {
		free(buffer);
		return 0;
	}

	if (unzCloseCurrentFile(_zipFile) != UNZ_OK) {
		free(buffer);
		return 0;
	}

	return new MemoryReadStream(buffer, fileInfo.uncompressed_size, DisposeAfterUse::YES);

	// FIXME: instead of reading all into a memory stream, we could
	// instead create a new ZipStream class. But then we have to be
	// careful to handle the case where the client code opens multiple
	// files in the archive and tries to use them independently.
}

Archive *makeZipArchive(const String &name) {
	return makeZipArchive(SearchMan.createReadStreamForMember(name));
}

Archive *makeZipArchive(const FSNode &node) {
	return makeZipArchive(node.createReadStream());
}

Archive *makeZipArchive(SeekableReadStream *stream) {
	if (!stream)
		return 0;
	unzFile zipFile = unzOpen(stream);
	if (!zipFile) {
		// stream gets deleted by unzOpen() call if something
		// goes wrong.
		return 0;
	}
	return new ZipArchive(zipFile);
}

}	// End of namespace Common