aboutsummaryrefslogtreecommitdiff
path: root/zlib/contrib/minizip/zip.c
blob: 7fbe0027437e794f14fd1f1d4287970d46573103 (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
/* zip.c -- IO on .zip files using zlib
   Version 1.01e, February 12th, 2005

   27 Dec 2004 Rolf Kalbermatter
   Modification to zipOpen2 to support globalComment retrieval.

   Copyright (C) 1998-2005 Gilles Vollant

   Read zip.h for more info
*/


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "zlib.h"
#include "zip.h"

#ifdef STDC
#  include <stddef.h>
#  include <string.h>
#  include <stdlib.h>
#endif
#ifdef NO_ERRNO_H
    extern int errno;
#else
#   include <errno.h>
#endif


#ifndef local
#  define local static
#endif
/* compile with -Dlocal if your debugger can't find static symbols */

#ifndef VERSIONMADEBY
# define VERSIONMADEBY   (0x0) /* platform depedent */
#endif

#ifndef Z_BUFSIZE
#define Z_BUFSIZE (16384)
#endif

#ifndef Z_MAXFILENAMEINZIP
#define Z_MAXFILENAMEINZIP (256)
#endif

#ifndef ALLOC
# define ALLOC(size) (malloc(size))
#endif
#ifndef TRYFREE
# define TRYFREE(p) {if (p) free(p);}
#endif

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

/* I've found an old Unix (a SunOS 4.1.3_U1) without all SEEK_* defined.... */

#ifndef SEEK_CUR
#define SEEK_CUR    1
#endif

#ifndef SEEK_END
#define SEEK_END    2
#endif

#ifndef SEEK_SET
#define SEEK_SET    0
#endif

#ifndef DEF_MEM_LEVEL
#if MAX_MEM_LEVEL >= 8
#  define DEF_MEM_LEVEL 8
#else
#  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
#endif
#endif
const char zip_copyright[] =
   " zip 1.01 Copyright 1998-2004 Gilles Vollant - http://www.winimage.com/zLibDll";


#define SIZEDATA_INDATABLOCK (4096-(4*4))

#define LOCALHEADERMAGIC    (0x04034b50)
#define CENTRALHEADERMAGIC  (0x02014b50)
#define ENDHEADERMAGIC      (0x06054b50)

#define FLAG_LOCALHEADER_OFFSET (0x06)
#define CRC_LOCALHEADER_OFFSET  (0x0e)

#define SIZECENTRALHEADER (0x2e) /* 46 */

typedef struct linkedlist_datablock_internal_s
{
  struct linkedlist_datablock_internal_s* next_datablock;
  uLong  avail_in_this_block;
  uLong  filled_in_this_block;
  uLong  unused; /* for future use and alignement */
  unsigned char data[SIZEDATA_INDATABLOCK];
} linkedlist_datablock_internal;

typedef struct linkedlist_data_s
{
    linkedlist_datablock_internal* first_block;
    linkedlist_datablock_internal* last_block;
} linkedlist_data;


typedef struct
{
    z_stream stream;            /* zLib stream structure for inflate */
    int  stream_initialised;    /* 1 is stream is initialised */
    uInt pos_in_buffered_data;  /* last written byte in buffered_data */

    uLong pos_local_header;     /* offset of the local header of the file
                                     currenty writing */
    char* central_header;       /* central header data for the current file */
    uLong size_centralheader;   /* size of the central header for cur file */
    uLong flag;                 /* flag of the file currently writing */

    int  method;                /* compression method of file currenty wr.*/
    int  raw;                   /* 1 for directly writing raw data */
    Byte buffered_data[Z_BUFSIZE];/* buffer contain compressed data to be writ*/
    uLong dosDate;
    uLong crc32;
    int  encrypt;
#ifndef NOCRYPT
    unsigned long keys[3];     /* keys defining the pseudo-random sequence */
    const unsigned long* pcrc_32_tab;
    int crypt_header_size;
#endif
} curfile_info;

typedef struct
{
    zlib_filefunc_def z_filefunc;
    voidpf filestream;        /* io structore of the zipfile */
    linkedlist_data central_dir;/* datablock with central dir in construction*/
    int  in_opened_file_inzip;  /* 1 if a file in the zip is currently writ.*/
    curfile_info ci;            /* info on the file curretly writing */

    uLong begin_pos;            /* position of the beginning of the zipfile */
    uLong add_position_when_writting_offset;
    uLong number_entry;
#ifndef NO_ADDFILEINEXISTINGZIP
    char *globalcomment;
#endif
} zip_internal;



#ifndef NOCRYPT
#define INCLUDECRYPTINGCODE_IFCRYPTALLOWED
#include "crypt.h"
#endif

local linkedlist_datablock_internal* allocate_new_datablock()
{
    linkedlist_datablock_internal* ldi;
    ldi = (linkedlist_datablock_internal*)
                 ALLOC(sizeof(linkedlist_datablock_internal));
    if (ldi!=NULL)
    {
        ldi->next_datablock = NULL ;
        ldi->filled_in_this_block = 0 ;
        ldi->avail_in_this_block = SIZEDATA_INDATABLOCK ;
    }
    return ldi;
}

local void free_datablock(ldi)
    linkedlist_datablock_internal* ldi;
{
    while (ldi!=NULL)
    {
        linkedlist_datablock_internal* ldinext = ldi->next_datablock;
        TRYFREE(ldi);
        ldi = ldinext;
    }
}

local void init_linkedlist(ll)
    linkedlist_data* ll;
{
    ll->first_block = ll->last_block = NULL;
}

local void free_linkedlist(ll)
    linkedlist_data* ll;
{
    free_datablock(ll->first_block);
    ll->first_block = ll->last_block = NULL;
}


local int add_data_in_datablock(ll,buf,len)
    linkedlist_data* ll;
    const void* buf;
    uLong len;
{
    linkedlist_datablock_internal* ldi;
    const unsigned char* from_copy;

    if (ll==NULL)
        return ZIP_INTERNALERROR;

    if (ll->last_block == NULL)
    {
        ll->first_block = ll->last_block = allocate_new_datablock();
        if (ll->first_block == NULL)
            return ZIP_INTERNALERROR;
    }

    ldi = ll->last_block;
    from_copy = (unsigned char*)buf;

    while (len>0)
    {
        uInt copy_this;
        uInt i;
        unsigned char* to_copy;

        if (ldi->avail_in_this_block==0)
        {
            ldi->next_datablock = allocate_new_datablock();
            if (ldi->next_datablock == NULL)
                return ZIP_INTERNALERROR;
            ldi = ldi->next_datablock ;
            ll->last_block = ldi;
        }

        if (ldi->avail_in_this_block < len)
            copy_this = (uInt)ldi->avail_in_this_block;
        else
            copy_this = (uInt)len;

        to_copy = &(ldi->data[ldi->filled_in_this_block]);

        for (i=0;i<copy_this;i++)
            *(to_copy+i)=*(from_copy+i);

        ldi->filled_in_this_block += copy_this;
        ldi->avail_in_this_block -= copy_this;
        from_copy += copy_this ;
        len -= copy_this;
    }
    return ZIP_OK;
}



/****************************************************************************/

#ifndef NO_ADDFILEINEXISTINGZIP
/* ===========================================================================
   Inputs a long in LSB order to the given file
   nbByte == 1, 2 or 4 (byte, short or long)
*/

local int ziplocal_putValue OF((const zlib_filefunc_def* pzlib_filefunc_def,
                                voidpf filestream, uLong x, int nbByte));
local int ziplocal_putValue (pzlib_filefunc_def, filestream, x, nbByte)
    const zlib_filefunc_def* pzlib_filefunc_def;
    voidpf filestream;
    uLong x;
    int nbByte;
{
    unsigned char buf[4];
    int n;
    for (n = 0; n < nbByte; n++)
    {
        buf[n] = (unsigned char)(x & 0xff);
        x >>= 8;
    }
    if (x != 0)
      {     /* data overflow - hack for ZIP64 (X Roche) */
      for (n = 0; n < nbByte; n++)
        {
          buf[n] = 0xff;
        }
      }

    if (ZWRITE(*pzlib_filefunc_def,filestream,buf,nbByte)!=(uLong)nbByte)
        return ZIP_ERRNO;
    else
        return ZIP_OK;
}

local void ziplocal_putValue_inmemory OF((void* dest, uLong x, int nbByte));
local void ziplocal_putValue_inmemory (dest, x, nbByte)
    void* dest;
    uLong x;
    int nbByte;
{
    unsigned char* buf=(unsigned char*)dest;
    int n;
    for (n = 0; n < nbByte; n++) {
        buf[n] = (unsigned char)(x & 0xff);
        x >>= 8;
    }

    if (x != 0)
    {     /* data overflow - hack for ZIP64 */
       for (n = 0; n < nbByte; n++)
       {
          buf[n] = 0xff;
       }
    }
}

/****************************************************************************/


local uLong ziplocal_TmzDateToDosDate(ptm,dosDate)
    const tm_zip* ptm;
    uLong dosDate;
{
    uLong year = (uLong)ptm->tm_year;
    if (year>1980)
        year-=1980;
    else if (year>80)
        year-=80;
    return
      (uLong) (((ptm->tm_mday) + (32 * (ptm->tm_mon+1)) + (512 * year)) << 16) |
        ((ptm->tm_sec/2) + (32* ptm->tm_min) + (2048 * (uLong)ptm->tm_hour));
}


/****************************************************************************/

local int ziplocal_getByte OF((
    const zlib_filefunc_def* pzlib_filefunc_def,
    voidpf filestream,
    int *pi));

local int ziplocal_getByte(pzlib_filefunc_def,filestream,pi)
    const zlib_filefunc_def* pzlib_filefunc_def;
    voidpf filestream;
    int *pi;
{
    unsigned char c;
    int err = (int)ZREAD(*pzlib_filefunc_def,filestream,&c,1);
    if (err==1)
    {
        *pi = (int)c;
        return ZIP_OK;
    }
    else
    {
        if (ZERROR(*pzlib_filefunc_def,filestream))
            return ZIP_ERRNO;
        else
            return ZIP_EOF;
    }
}


/* ===========================================================================
   Reads a long in LSB order from the given gz_stream. Sets
*/
local int ziplocal_getShort OF((
    const zlib_filefunc_def* pzlib_filefunc_def,
    voidpf filestream,
    uLong *pX));

local int ziplocal_getShort (pzlib_filefunc_def,filestream,pX)
    const zlib_filefunc_def* pzlib_filefunc_def;
    voidpf filestream;
    uLong *pX;
{
    uLong x ;
    int i;
    int err;

    err = ziplocal_getByte(pzlib_filefunc_def,filestream,&i);
    x = (uLong)i;

    if (err==ZIP_OK)
        err = ziplocal_getByte(pzlib_filefunc_def,filestream,&i);
    x += ((uLong)i)<<8;

    if (err==ZIP_OK)
        *pX = x;
    else
        *pX = 0;
    return err;
}

local int ziplocal_getLong OF((
    const zlib_filefunc_def* pzlib_filefunc_def,
    voidpf filestream,
    uLong *pX));

local int ziplocal_getLong (pzlib_filefunc_def,filestream,pX)
    const zlib_filefunc_def* pzlib_filefunc_def;
    voidpf filestream;
    uLong *pX;
{
    uLong x ;
    int i;
    int err;

    err = ziplocal_getByte(pzlib_filefunc_def,filestream,&i);
    x = (uLong)i;

    if (err==ZIP_OK)
        err = ziplocal_getByte(pzlib_filefunc_def,filestream,&i);
    x += ((uLong)i)<<8;

    if (err==ZIP_OK)
        err = ziplocal_getByte(pzlib_filefunc_def,filestream,&i);
    x += ((uLong)i)<<16;

    if (err==ZIP_OK)
        err = ziplocal_getByte(pzlib_filefunc_def,filestream,&i);
    x += ((uLong)i)<<24;

    if (err==ZIP_OK)
        *pX = x;
    else
        *pX = 0;
    return err;
}

#ifndef BUFREADCOMMENT
#define BUFREADCOMMENT (0x400)
#endif
/*
  Locate the Central directory of a zipfile (at the end, just before
    the global comment)
*/
local uLong ziplocal_SearchCentralDir OF((
    const zlib_filefunc_def* pzlib_filefunc_def,
    voidpf filestream));

local uLong ziplocal_SearchCentralDir(pzlib_filefunc_def,filestream)
    const zlib_filefunc_def* pzlib_filefunc_def;
    voidpf filestream;
{
    unsigned char* buf;
    uLong uSizeFile;
    uLong uBackRead;
    uLong uMaxBack=0xffff; /* maximum size of global comment */
    uLong uPosFound=0;

    if (ZSEEK(*pzlib_filefunc_def,filestream,0,ZLIB_FILEFUNC_SEEK_END) != 0)
        return 0;


    uSizeFile = ZTELL(*pzlib_filefunc_def,filestream);

    if (uMaxBack>uSizeFile)
        uMaxBack = uSizeFile;

    buf = (unsigned char*)ALLOC(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);
        if (ZSEEK(*pzlib_filefunc_def,filestream,uReadPos,ZLIB_FILEFUNC_SEEK_SET)!=0)
            break;

        if (ZREAD(*pzlib_filefunc_def,filestream,buf,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;
    }
    TRYFREE(buf);
    return uPosFound;
}
#endif /* !NO_ADDFILEINEXISTINGZIP*/

/************************************************************/
extern zipFile ZEXPORT zipOpen2 (pathname, append, globalcomment, pzlib_filefunc_def)
    const char *pathname;
    int append;
    zipcharpc* globalcomment;
    zlib_filefunc_def* pzlib_filefunc_def;
{
    zip_internal ziinit;
    zip_internal* zi;
    int err=ZIP_OK;


    if (pzlib_filefunc_def==NULL)
        fill_fopen_filefunc(&ziinit.z_filefunc);
    else
        ziinit.z_filefunc = *pzlib_filefunc_def;

    ziinit.filestream = (*(ziinit.z_filefunc.zopen_file))
                 (ziinit.z_filefunc.opaque,
                  pathname,
                  (append == APPEND_STATUS_CREATE) ?
                  (ZLIB_FILEFUNC_MODE_READ | ZLIB_FILEFUNC_MODE_WRITE | ZLIB_FILEFUNC_MODE_CREATE) :
                    (ZLIB_FILEFUNC_MODE_READ | ZLIB_FILEFUNC_MODE_WRITE | ZLIB_FILEFUNC_MODE_EXISTING));

    if (ziinit.filestream == NULL)
        return NULL;
    ziinit.begin_pos = ZTELL(ziinit.z_filefunc,ziinit.filestream);
    ziinit.in_opened_file_inzip = 0;
    ziinit.ci.stream_initialised = 0;
    ziinit.number_entry = 0;
    ziinit.add_position_when_writting_offset = 0;
    init_linkedlist(&(ziinit.central_dir));


    zi = (zip_internal*)ALLOC(sizeof(zip_internal));
    if (zi==NULL)
    {
        ZCLOSE(ziinit.z_filefunc,ziinit.filestream);
        return NULL;
    }

    /* now we add file in a zipfile */
#    ifndef NO_ADDFILEINEXISTINGZIP
    ziinit.globalcomment = NULL;
    if (append == APPEND_STATUS_ADDINZIP)
    {
        uLong byte_before_the_zipfile;/* byte before the zipfile, (>0 for sfx)*/

        uLong size_central_dir;     /* size of the central directory  */
        uLong offset_central_dir;   /* offset of start of central directory */
        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;
        uLong number_entry_CD;      /* total number of entries in
                                    the central dir
                                    (same than number_entry on nospan) */
        uLong size_comment;

        central_pos = ziplocal_SearchCentralDir(&ziinit.z_filefunc,ziinit.filestream);
        if (central_pos==0)
            err=ZIP_ERRNO;

        if (ZSEEK(ziinit.z_filefunc, ziinit.filestream,
                                        central_pos,ZLIB_FILEFUNC_SEEK_SET)!=0)
            err=ZIP_ERRNO;

        /* the signature, already checked */
        if (ziplocal_getLong(&ziinit.z_filefunc, ziinit.filestream,&uL)!=ZIP_OK)
            err=ZIP_ERRNO;

        /* number of this disk */
        if (ziplocal_getShort(&ziinit.z_filefunc, ziinit.filestream,&number_disk)!=ZIP_OK)
            err=ZIP_ERRNO;

        /* number of the disk with the start of the central directory */
        if (ziplocal_getShort(&ziinit.z_filefunc, ziinit.filestream,&number_disk_with_CD)!=ZIP_OK)
            err=ZIP_ERRNO;

        /* total number of entries in the central dir on this disk */
        if (ziplocal_getShort(&ziinit.z_filefunc, ziinit.filestream,&number_entry)!=ZIP_OK)
            err=ZIP_ERRNO;

        /* total number of entries in the central dir */
        if (ziplocal_getShort(&ziinit.z_filefunc, ziinit.filestream,&number_entry_CD)!=ZIP_OK)
            err=ZIP_ERRNO;

        if ((number_entry_CD!=number_entry) ||
            (number_disk_with_CD!=0) ||
            (number_disk!=0))
            err=ZIP_BADZIPFILE;

        /* size of the central directory */
        if (ziplocal_getLong(&ziinit.z_filefunc, ziinit.filestream,&size_central_dir)!=ZIP_OK)
            err=ZIP_ERRNO;

        /* offset of start of central directory with respect to the
            starting disk number */
        if (ziplocal_getLong(&ziinit.z_filefunc, ziinit.filestream,&offset_central_dir)!=ZIP_OK)
            err=ZIP_ERRNO;

        /* zipfile global comment length */
        if (ziplocal_getShort(&ziinit.z_filefunc, ziinit.filestream,&size_comment)!=ZIP_OK)
            err=ZIP_ERRNO;

        if ((central_pos<offset_central_dir+size_central_dir) &&
            (err==ZIP_OK))
            err=ZIP_BADZIPFILE;

        if (err!=ZIP_OK)
        {
            ZCLOSE(ziinit.z_filefunc, ziinit.filestream);
            return NULL;
        }

        if (size_comment>0)
        {
            ziinit.globalcomment = ALLOC(size_comment+1);
            if (ziinit.globalcomment)
            {
               size_comment = ZREAD(ziinit.z_filefunc, ziinit.filestream,ziinit.globalcomment,size_comment);
               ziinit.globalcomment[size_comment]=0;
            }
        }

        byte_before_the_zipfile = central_pos -
                                (offset_central_dir+size_central_dir);
        ziinit.add_position_when_writting_offset = byte_before_the_zipfile;

        {
            uLong size_central_dir_to_read = size_central_dir;
            size_t buf_size = SIZEDATA_INDATABLOCK;
            void* buf_read = (void*)ALLOC(buf_size);
            if (ZSEEK(ziinit.z_filefunc, ziinit.filestream,
                  offset_central_dir + byte_before_the_zipfile,
                  ZLIB_FILEFUNC_SEEK_SET) != 0)
                  err=ZIP_ERRNO;

            while ((size_central_dir_to_read>0) && (err==ZIP_OK))
            {
                uLong read_this = SIZEDATA_INDATABLOCK;
                if (read_this > size_central_dir_to_read)
                    read_this = size_central_dir_to_read;
                if (ZREAD(ziinit.z_filefunc, ziinit.filestream,buf_read,read_this) != read_this)
                    err=ZIP_ERRNO;

                if (err==ZIP_OK)
                    err = add_data_in_datablock(&ziinit.central_dir,buf_read,
                                                (uLong)read_this);
                size_central_dir_to_read-=read_this;
            }
            TRYFREE(buf_read);
        }
        ziinit.begin_pos = byte_before_the_zipfile;
        ziinit.number_entry = number_entry_CD;

        if (ZSEEK(ziinit.z_filefunc, ziinit.filestream,
                  offset_central_dir+byte_before_the_zipfile,ZLIB_FILEFUNC_SEEK_SET)!=0)
            err=ZIP_ERRNO;
    }

    if (globalcomment)
    {
      *globalcomment = ziinit.globalcomment;
    }
#    endif /* !NO_ADDFILEINEXISTINGZIP*/

    if (err != ZIP_OK)
    {
#    ifndef NO_ADDFILEINEXISTINGZIP
        TRYFREE(ziinit.globalcomment);
#    endif /* !NO_ADDFILEINEXISTINGZIP*/
        TRYFREE(zi);
        return NULL;
    }
    else
    {
        *zi = ziinit;
        return (zipFile)zi;
    }
}

extern zipFile ZEXPORT zipOpen (pathname, append)
    const char *pathname;
    int append;
{
    return zipOpen2(pathname,append,NULL,NULL);
}

extern int ZEXPORT zipOpenNewFileInZip3 (file, filename, zipfi,
                                         extrafield_local, size_extrafield_local,
                                         extrafield_global, size_extrafield_global,
                                         comment, method, level, raw,
                                         windowBits, memLevel, strategy,
                                         password, crcForCrypting)
    zipFile file;
    const char* filename;
    const zip_fileinfo* zipfi;
    const void* extrafield_local;
    uInt size_extrafield_local;
    const void* extrafield_global;
    uInt size_extrafield_global;
    const char* comment;
    int method;
    int level;
    int raw;
    int windowBits;
    int memLevel;
    int strategy;
    const char* password;
    uLong crcForCrypting;
{
    zip_internal* zi;
    uInt size_filename;
    uInt size_comment;
    uInt i;
    int err = ZIP_OK;

#    ifdef NOCRYPT
    if (password != NULL)
        return ZIP_PARAMERROR;
#    endif

    if (file == NULL)
        return ZIP_PARAMERROR;
    if ((method!=0) && (method!=Z_DEFLATED))
        return ZIP_PARAMERROR;

    zi = (zip_internal*)file;

    if (zi->in_opened_file_inzip == 1)
    {
        err = zipCloseFileInZip (file);
        if (err != ZIP_OK)
            return err;
    }


    if (filename==NULL)
        filename="-";

    if (comment==NULL)
        size_comment = 0;
    else
        size_comment = (uInt)strlen(comment);

    size_filename = (uInt)strlen(filename);

    if (zipfi == NULL)
        zi->ci.dosDate = 0;
    else
    {
        if (zipfi->dosDate != 0)
            zi->ci.dosDate = zipfi->dosDate;
        else zi->ci.dosDate = ziplocal_TmzDateToDosDate(&zipfi->tmz_date,zipfi->dosDate);
    }

    zi->ci.flag = 0;
    if ((level==8) || (level==9))
      zi->ci.flag |= 2;
    if ((level==2))
      zi->ci.flag |= 4;
    if ((level==1))
      zi->ci.flag |= 6;
    if (password != NULL)
      zi->ci.flag |= 1;

    zi->ci.crc32 = 0;
    zi->ci.method = method;
    zi->ci.encrypt = 0;
    zi->ci.stream_initialised = 0;
    zi->ci.pos_in_buffered_data = 0;
    zi->ci.raw = raw;
    zi->ci.pos_local_header = ZTELL(zi->z_filefunc,zi->filestream) ;
    zi->ci.size_centralheader = SIZECENTRALHEADER + size_filename +
                                      size_extrafield_global + size_comment;
    zi->ci.central_header = (char*)ALLOC((uInt)zi->ci.size_centralheader);

    ziplocal_putValue_inmemory(zi->ci.central_header,(uLong)CENTRALHEADERMAGIC,4);
    /* version info */
    ziplocal_putValue_inmemory(zi->ci.central_header+4,(uLong)VERSIONMADEBY,2);
    ziplocal_putValue_inmemory(zi->ci.central_header+6,(uLong)20,2);
    ziplocal_putValue_inmemory(zi->ci.central_header+8,(uLong)zi->ci.flag,2);
    ziplocal_putValue_inmemory(zi->ci.central_header+10,(uLong)zi->ci.method,2);
    ziplocal_putValue_inmemory(zi->ci.central_header+12,(uLong)zi->ci.dosDate,4);
    ziplocal_putValue_inmemory(zi->ci.central_header+16,(uLong)0,4); /*crc*/
    ziplocal_putValue_inmemory(zi->ci.central_header+20,(uLong)0,4); /*compr size*/
    ziplocal_putValue_inmemory(zi->ci.central_header+24,(uLong)0,4); /*uncompr size*/
    ziplocal_putValue_inmemory(zi->ci.central_header+28,(uLong)size_filename,2);
    ziplocal_putValue_inmemory(zi->ci.central_header+30,(uLong)size_extrafield_global,2);
    ziplocal_putValue_inmemory(zi->ci.central_header+32,(uLong)size_comment,2);
    ziplocal_putValue_inmemory(zi->ci.central_header+34,(uLong)0,2); /*disk nm start*/

    if (zipfi==NULL)
        ziplocal_putValue_inmemory(zi->ci.central_header+36,(uLong)0,2);
    else
        ziplocal_putValue_inmemory(zi->ci.central_header+36,(uLong)zipfi->internal_fa,2);

    if (zipfi==NULL)
        ziplocal_putValue_inmemory(zi->ci.central_header+38,(uLong)0,4);
    else
        ziplocal_putValue_inmemory(zi->ci.central_header+38,(uLong)zipfi->external_fa,4);

    ziplocal_putValue_inmemory(zi->ci.central_header+42,(uLong)zi->ci.pos_local_header- zi->add_position_when_writting_offset,4);

    for (i=0;i<size_filename;i++)
        *(zi->ci.central_header+SIZECENTRALHEADER+i) = *(filename+i);

    for (i=0;i<size_extrafield_global;i++)
        *(zi->ci.central_header+SIZECENTRALHEADER+size_filename+i) =
              *(((const char*)extrafield_global)+i);

    for (i=0;i<size_comment;i++)
        *(zi->ci.central_header+SIZECENTRALHEADER+size_filename+
              size_extrafield_global+i) = *(comment+i);
    if (zi->ci.central_header == NULL)
        return ZIP_INTERNALERROR;

    /* write the local header */
    err = ziplocal_putValue(&zi->z_filefunc,zi->filestream,(uLong)LOCALHEADERMAGIC,4);

    if (err==ZIP_OK)
        err = ziplocal_putValue(&zi->z_filefunc,zi->filestream,(uLong)20,2);/* version needed to extract */
    if (err==ZIP_OK)
        err = ziplocal_putValue(&zi->z_filefunc,zi->filestream,(uLong)zi->ci.flag,2);

    if (err==ZIP_OK)
        err = ziplocal_putValue(&zi->z_filefunc,zi->filestream,(uLong)zi->ci.method,2);

    if (err==ZIP_OK)
        err = ziplocal_putValue(&zi->z_filefunc,zi->filestream,(uLong)zi->ci.dosDate,4);

    if (err==ZIP_OK)
        err = ziplocal_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,4); /* crc 32, unknown */
    if (err==ZIP_OK)
        err = ziplocal_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,4); /* compressed size, unknown */
    if (err==ZIP_OK)
        err = ziplocal_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,4); /* uncompressed size, unknown */

    if (err==ZIP_OK)
        err = ziplocal_putValue(&zi->z_filefunc,zi->filestream,(uLong)size_filename,2);

    if (err==ZIP_OK)
        err = ziplocal_putValue(&zi->z_filefunc,zi->filestream,(uLong)size_extrafield_local,2);

    if ((err==ZIP_OK) && (size_filename>0))
        if (ZWRITE(zi->z_filefunc,zi->filestream,filename,size_filename)!=size_filename)
                err = ZIP_ERRNO;

    if ((err==ZIP_OK) && (size_extrafield_local>0))
        if (ZWRITE(zi->z_filefunc,zi->filestream,extrafield_local,size_extrafield_local)
                                                                           !=size_extrafield_local)
                err = ZIP_ERRNO;

    zi->ci.stream.avail_in = (uInt)0;
    zi->ci.stream.avail_out = (uInt)Z_BUFSIZE;
    zi->ci.stream.next_out = zi->ci.buffered_data;
    zi->ci.stream.total_in = 0;
    zi->ci.stream.total_out = 0;

    if ((err==ZIP_OK) && (zi->ci.method == Z_DEFLATED) && (!zi->ci.raw))
    {
        zi->ci.stream.zalloc = (alloc_func)0;
        zi->ci.stream.zfree = (free_func)0;
        zi->ci.stream.opaque = (voidpf)0;

        if (windowBits>0)
            windowBits = -windowBits;

        err = deflateInit2(&zi->ci.stream, level,
               Z_DEFLATED, windowBits, memLevel, strategy);

        if (err==Z_OK)
            zi->ci.stream_initialised = 1;
    }
#    ifndef NOCRYPT
    zi->ci.crypt_header_size = 0;
    if ((err==Z_OK) && (password != NULL))
    {
        unsigned char bufHead[RAND_HEAD_LEN];
        unsigned int sizeHead;
        zi->ci.encrypt = 1;
        zi->ci.pcrc_32_tab = get_crc_table();
        /*init_keys(password,zi->ci.keys,zi->ci.pcrc_32_tab);*/

        sizeHead=crypthead(password,bufHead,RAND_HEAD_LEN,zi->ci.keys,zi->ci.pcrc_32_tab,crcForCrypting);
        zi->ci.crypt_header_size = sizeHead;

        if (ZWRITE(zi->z_filefunc,zi->filestream,bufHead,sizeHead) != sizeHead)
                err = ZIP_ERRNO;
    }
#    endif

    if (err==Z_OK)
        zi->in_opened_file_inzip = 1;
    return err;
}

extern int ZEXPORT zipOpenNewFileInZip2(file, filename, zipfi,
                                        extrafield_local, size_extrafield_local,
                                        extrafield_global, size_extrafield_global,
                                        comment, method, level, raw)
    zipFile file;
    const char* filename;
    const zip_fileinfo* zipfi;
    const void* extrafield_local;
    uInt size_extrafield_local;
    const void* extrafield_global;
    uInt size_extrafield_global;
    const char* comment;
    int method;
    int level;
    int raw;
{
    return zipOpenNewFileInZip3 (file, filename, zipfi,
                                 extrafield_local, size_extrafield_local,
                                 extrafield_global, size_extrafield_global,
                                 comment, method, level, raw,
                                 -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY,
                                 NULL, 0);
}

extern int ZEXPORT zipOpenNewFileInZip (file, filename, zipfi,
                                        extrafield_local, size_extrafield_local,
                                        extrafield_global, size_extrafield_global,
                                        comment, method, level)
    zipFile file;
    const char* filename;
    const zip_fileinfo* zipfi;
    const void* extrafield_local;
    uInt size_extrafield_local;
    const void* extrafield_global;
    uInt size_extrafield_global;
    const char* comment;
    int method;
    int level;
{
    return zipOpenNewFileInZip2 (file, filename, zipfi,
                                 extrafield_local, size_extrafield_local,
                                 extrafield_global, size_extrafield_global,
                                 comment, method, level, 0);
}

local int zipFlushWriteBuffer(zi)
  zip_internal* zi;
{
    int err=ZIP_OK;

    if (zi->ci.encrypt != 0)
    {
#ifndef NOCRYPT
        uInt i;
        int t;
        for (i=0;i<zi->ci.pos_in_buffered_data;i++)
            zi->ci.buffered_data[i] = zencode(zi->ci.keys, zi->ci.pcrc_32_tab,
                                       zi->ci.buffered_data[i],t);
#endif
    }
    if (ZWRITE(zi->z_filefunc,zi->filestream,zi->ci.buffered_data,zi->ci.pos_in_buffered_data)
                                                                    !=zi->ci.pos_in_buffered_data)
      err = ZIP_ERRNO;
    zi->ci.pos_in_buffered_data = 0;
    return err;
}

extern int ZEXPORT zipWriteInFileInZip (file, buf, len)
    zipFile file;
    const void* buf;
    unsigned len;
{
    zip_internal* zi;
    int err=ZIP_OK;

    if (file == NULL)
        return ZIP_PARAMERROR;
    zi = (zip_internal*)file;

    if (zi->in_opened_file_inzip == 0)
        return ZIP_PARAMERROR;

    zi->ci.stream.next_in = (void*)buf;
    zi->ci.stream.avail_in = len;
    zi->ci.crc32 = crc32(zi->ci.crc32,buf,len);

    while ((err==ZIP_OK) && (zi->ci.stream.avail_in>0))
    {
        if (zi->ci.stream.avail_out == 0)
        {
            if (zipFlushWriteBuffer(zi) == ZIP_ERRNO)
                err = ZIP_ERRNO;
            zi->ci.stream.avail_out = (uInt)Z_BUFSIZE;
            zi->ci.stream.next_out = zi->ci.buffered_data;
        }


        if(err != ZIP_OK)
            break;

        if ((zi->ci.method == Z_DEFLATED) && (!zi->ci.raw))
        {
            uLong uTotalOutBefore = zi->ci.stream.total_out;
            err=deflate(&zi->ci.stream,  Z_NO_FLUSH);
            zi->ci.pos_in_buffered_data += (uInt)(zi->ci.stream.total_out - uTotalOutBefore) ;

        }
        else
        {
            uInt copy_this,i;
            if (zi->ci.stream.avail_in < zi->ci.stream.avail_out)
                copy_this = zi->ci.stream.avail_in;
            else
                copy_this = zi->ci.stream.avail_out;
            for (i=0;i<copy_this;i++)
                *(((char*)zi->ci.stream.next_out)+i) =
                    *(((const char*)zi->ci.stream.next_in)+i);
            {
                zi->ci.stream.avail_in -= copy_this;
                zi->ci.stream.avail_out-= copy_this;
                zi->ci.stream.next_in+= copy_this;
                zi->ci.stream.next_out+= copy_this;
                zi->ci.stream.total_in+= copy_this;
                zi->ci.stream.total_out+= copy_this;
                zi->ci.pos_in_buffered_data += copy_this;
            }
        }
    }

    return err;
}

extern int ZEXPORT zipCloseFileInZipRaw (file, uncompressed_size, crc32)
    zipFile file;
    uLong uncompressed_size;
    uLong crc32;
{
    zip_internal* zi;
    uLong compressed_size;
    int err=ZIP_OK;

    if (file == NULL)
        return ZIP_PARAMERROR;
    zi = (zip_internal*)file;

    if (zi->in_opened_file_inzip == 0)
        return ZIP_PARAMERROR;
    zi->ci.stream.avail_in = 0;

    if ((zi->ci.method == Z_DEFLATED) && (!zi->ci.raw))
        while (err==ZIP_OK)
    {
        uLong uTotalOutBefore;
        if (zi->ci.stream.avail_out == 0)
        {
            if (zipFlushWriteBuffer(zi) == ZIP_ERRNO)
                err = ZIP_ERRNO;
            zi->ci.stream.avail_out = (uInt)Z_BUFSIZE;
            zi->ci.stream.next_out = zi->ci.buffered_data;
        }
        uTotalOutBefore = zi->ci.stream.total_out;
        err=deflate(&zi->ci.stream,  Z_FINISH);
        zi->ci.pos_in_buffered_data += (uInt)(zi->ci.stream.total_out - uTotalOutBefore) ;
    }

    if (err==Z_STREAM_END)
        err=ZIP_OK; /* this is normal */

    if ((zi->ci.pos_in_buffered_data>0) && (err==ZIP_OK))
        if (zipFlushWriteBuffer(zi)==ZIP_ERRNO)
            err = ZIP_ERRNO;

    if ((zi->ci.method == Z_DEFLATED) && (!zi->ci.raw))
    {
        err=deflateEnd(&zi->ci.stream);
        zi->ci.stream_initialised = 0;
    }

    if (!zi->ci.raw)
    {
        crc32 = (uLong)zi->ci.crc32;
        uncompressed_size = (uLong)zi->ci.stream.total_in;
    }
    compressed_size = (uLong)zi->ci.stream.total_out;
#    ifndef NOCRYPT
    compressed_size += zi->ci.crypt_header_size;
#    endif

    ziplocal_putValue_inmemory(zi->ci.central_header+16,crc32,4); /*crc*/
    ziplocal_putValue_inmemory(zi->ci.central_header+20,
                                compressed_size,4); /*compr size*/
    if (zi->ci.stream.data_type == Z_ASCII)
        ziplocal_putValue_inmemory(zi->ci.central_header+36,(uLong)Z_ASCII,2);
    ziplocal_putValue_inmemory(zi->ci.central_header+24,
                                uncompressed_size,4); /*uncompr size*/

    if (err==ZIP_OK)
        err = add_data_in_datablock(&zi->central_dir,zi->ci.central_header,
                                       (uLong)zi->ci.size_centralheader);
    free(zi->ci.central_header);

    if (err==ZIP_OK)
    {
        long cur_pos_inzip = ZTELL(zi->z_filefunc,zi->filestream);
        if (ZSEEK(zi->z_filefunc,zi->filestream,
                  zi->ci.pos_local_header + 14,ZLIB_FILEFUNC_SEEK_SET)!=0)
            err = ZIP_ERRNO;

        if (err==ZIP_OK)
            err = ziplocal_putValue(&zi->z_filefunc,zi->filestream,crc32,4); /* crc 32, unknown */

        if (err==ZIP_OK) /* compressed size, unknown */
            err = ziplocal_putValue(&zi->z_filefunc,zi->filestream,compressed_size,4);

        if (err==ZIP_OK) /* uncompressed size, unknown */
            err = ziplocal_putValue(&zi->z_filefunc,zi->filestream,uncompressed_size,4);

        if (ZSEEK(zi->z_filefunc,zi->filestream,
                  cur_pos_inzip,ZLIB_FILEFUNC_SEEK_SET)!=0)
            err = ZIP_ERRNO;
    }

    zi->number_entry ++;
    zi->in_opened_file_inzip = 0;

    return err;
}

extern int ZEXPORT zipCloseFileInZip (file)
    zipFile file;
{
    return zipCloseFileInZipRaw (file,0,0);
}

extern int ZEXPORT zipClose (file, global_comment)
    zipFile file;
    const char* global_comment;
{
    zip_internal* zi;
    int err = 0;
    uLong size_centraldir = 0;
    uLong centraldir_pos_inzip;
    uInt size_global_comment;
    if (file == NULL)
        return ZIP_PARAMERROR;
    zi = (zip_internal*)file;

    if (zi->in_opened_file_inzip == 1)
    {
        err = zipCloseFileInZip (file);
    }

#ifndef NO_ADDFILEINEXISTINGZIP
    if (global_comment==NULL)
        global_comment = zi->globalcomment;
#endif
    if (global_comment==NULL)
        size_global_comment = 0;
    else
        size_global_comment = (uInt)strlen(global_comment);

    centraldir_pos_inzip = ZTELL(zi->z_filefunc,zi->filestream);
    if (err==ZIP_OK)
    {
        linkedlist_datablock_internal* ldi = zi->central_dir.first_block ;
        while (ldi!=NULL)
        {
            if ((err==ZIP_OK) && (ldi->filled_in_this_block>0))
                if (ZWRITE(zi->z_filefunc,zi->filestream,
                           ldi->data,ldi->filled_in_this_block)
                              !=ldi->filled_in_this_block )
                    err = ZIP_ERRNO;

            size_centraldir += ldi->filled_in_this_block;
            ldi = ldi->next_datablock;
        }
    }
    free_datablock(zi->central_dir.first_block);

    if (err==ZIP_OK) /* Magic End */
        err = ziplocal_putValue(&zi->z_filefunc,zi->filestream,(uLong)ENDHEADERMAGIC,4);

    if (err==ZIP_OK) /* number of this disk */
        err = ziplocal_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,2);

    if (err==ZIP_OK) /* number of the disk with the start of the central directory */
        err = ziplocal_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,2);

    if (err==ZIP_OK) /* total number of entries in the central dir on this disk */
        err = ziplocal_putValue(&zi->z_filefunc,zi->filestream,(uLong)zi->number_entry,2);

    if (err==ZIP_OK) /* total number of entries in the central dir */
        err = ziplocal_putValue(&zi->z_filefunc,zi->filestream,(uLong)zi->number_entry,2);

    if (err==ZIP_OK) /* size of the central directory */
        err = ziplocal_putValue(&zi->z_filefunc,zi->filestream,(uLong)size_centraldir,4);

    if (err==ZIP_OK) /* offset of start of central directory with respect to the
                            starting disk number */
        err = ziplocal_putValue(&zi->z_filefunc,zi->filestream,
                                (uLong)(centraldir_pos_inzip - zi->add_position_when_writting_offset),4);

    if (err==ZIP_OK) /* zipfile comment length */
        err = ziplocal_putValue(&zi->z_filefunc,zi->filestream,(uLong)size_global_comment,2);

    if ((err==ZIP_OK) && (size_global_comment>0))
        if (ZWRITE(zi->z_filefunc,zi->filestream,
                   global_comment,size_global_comment) != size_global_comment)
                err = ZIP_ERRNO;

    if (ZCLOSE(zi->z_filefunc,zi->filestream) != 0)
        if (err == ZIP_OK)
            err = ZIP_ERRNO;

#ifndef NO_ADDFILEINEXISTINGZIP
    TRYFREE(zi->globalcomment);
#endif
    TRYFREE(zi);

    return err;
}