src/common/unzip.c

   1 /* unzip.c -- IO on .zip files using zlib
   2    Version 0.15 beta, Mar 19th, 1998,
   3
   4    Read unzip.h for more info
   5 */
   6
   7 #if !defined(__VISAGECPP__)
   8 #   pragma warning(disable:4001)    /* non standard extension used: single line comment */
   9 #endif
  10 #include "wx/setup.h"
  11
  12 #if wxUSE_ZLIB && wxUSE_ZIPSTREAM
  13
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <string.h>
  17 #include "zlib.h"
  18
  19 /* Not the right solution (paths in makefiles) but... */
  20 #ifdef __BORLANDC__
  21 #include "../common/unzip.h"
  22 #else
  23 #include "unzip.h"
  24 #endif
  25
  26 #ifdef STDC
  27 #  include <stddef.h>
  28 #  include <string.h>
  29 #  include <stdlib.h>
  30 #endif
  31 #ifdef NO_ERRNO_H
  32     extern int errno;
  33 #else
  34 #   include <errno.h>
  35 #endif
  36
  37
  38 #ifndef local
  39 #  define local static
  40 #endif
  41 /* compile with -Dlocal if your debugger can't find static symbols */
  42
  43
  44
  45 #if !defined(unix) && !defined(CASESENSITIVITYDEFAULT_YES) && \
  46                       !defined(CASESENSITIVITYDEFAULT_NO)
  47 #define CASESENSITIVITYDEFAULT_NO
  48 #endif
  49
  50
  51 #ifndef UNZ_BUFSIZE
  52 #define UNZ_BUFSIZE (16384)
  53 #endif
  54
  55 #ifndef UNZ_MAXFILENAMEINZIP
  56 #define UNZ_MAXFILENAMEINZIP (256)
  57 #endif
  58
  59 #ifndef ALLOC
  60 # define ALLOC(size) (malloc(size))
  61 #endif
  62 #ifndef TRYFREE
  63 # define TRYFREE(p) {if (p) free(p);}
  64 #endif
  65
  66 #define SIZECENTRALDIRITEM (0x2e)
  67 #define SIZEZIPLOCALHEADER (0x1e)
  68
  69
  70 /* I've found an old Unix (a SunOS 4.1.3_U1) without all SEEK_* defined.... */
  71
  72 #ifndef SEEK_CUR
  73 #define SEEK_CUR    1
  74 #endif
  75
  76 #ifndef SEEK_END
  77 #define SEEK_END    2
  78 #endif
  79
  80 #ifndef SEEK_SET
  81 #define SEEK_SET    0
  82 #endif
  83
  84 const char unz_copyright[] =
  85    " unzip 0.15 Copyright 1998 Gilles Vollant ";
  86
  87 /* unz_file_info_interntal contain internal info about a file in zipfile*/
  88 typedef struct unz_file_info_internal_s
  89 {
  90     uLong offset_curfile;/* relative offset of local header 4 bytes */
  91 } unz_file_info_internal;
  92
  93
  94 /* file_in_zip_read_info_s contain internal information about a file in zipfile,
  95     when reading and decompress it */
  96 typedef struct
  97 {
  98         char  *read_buffer;         /* internal buffer for compressed data */
  99         z_stream stream;            /* zLib stream structure for inflate */
 100
 101         uLong pos_in_zipfile;       /* position in byte on the zipfile, for fseek*/
 102         uLong stream_initialised;   /* flag set if stream structure is initialised*/
 103
 104         uLong offset_local_extrafield;/* offset of the local extra field */
 105         uInt  size_local_extrafield;/* size of the local extra field */
 106         uLong pos_local_extrafield;   /* position in the local extra field in read*/
 107
 108         uLong crc32;                /* crc32 of all data uncompressed */
 109         uLong crc32_wait;           /* crc32 we must obtain after decompress all */
 110         uLong rest_read_compressed; /* number of byte to be decompressed */
 111         uLong rest_read_uncompressed;/*number of byte to be obtained after decomp*/
 112         FILE* file;                 /* io structore of the zipfile */
 113         uLong compression_method;   /* compression method (0==store) */
 114         uLong byte_before_the_zipfile;/* byte before the zipfile, (>0 for sfx)*/
 115 } file_in_zip_read_info_s;
 116
 117
 118 /* unz_s contain internal information about the zipfile
 119 */
 120 typedef struct
 121 {
 122         FILE* file;                 /* io structore of the zipfile */
 123         unz_global_info gi;       /* public global information */
 124         uLong byte_before_the_zipfile;/* byte before the zipfile, (>0 for sfx)*/
 125         uLong num_file;             /* number of the current file in the zipfile*/
 126         uLong pos_in_central_dir;   /* pos of the current file in the central dir*/
 127         uLong current_file_ok;      /* flag about the usability of the current file*/
 128         uLong central_pos;          /* position of the beginning of the central dir*/
 129
 130         uLong size_central_dir;     /* size of the central directory  */
 131         uLong offset_central_dir;   /* offset of start of central directory with
 132                                                                    respect to the starting disk number */
 133
 134         unz_file_info cur_file_info; /* public info about the current file in zip*/
 135         unz_file_info_internal cur_file_info_internal; /* private info about it*/
 136     file_in_zip_read_info_s* pfile_in_zip_read; /* structure about the current
 137                                             file if we are decompressing it */
 138 } unz_s;
 139
 140 #if defined (__VISAGECPP__)
 141 /* VA always requires prototypes */
 142 int unzlocal_CheckCurrentFileCoherencyHeader (unz_s*, uInt*, uLong*, uInt*);
 143 #endif
 144
 145 /* ===========================================================================
 146      Read a byte from a gz_stream; update next_in and avail_in. Return EOF
 147    for end of file.
 148    IN assertion: the stream s has been sucessfully opened for reading.
 149 */
 150
 151
 152 local int unzlocal_getByte(fin,pi)
 153         FILE *fin;
 154         int *pi;
 155 {
 156     unsigned char c;
 157         int err = fread(&c, 1, 1, fin);
 158     if (err==1)
 159     {
 160         *pi = (int)c;
 161         return UNZ_OK;
 162     }
 163     else
 164     {
 165         if (ferror(fin))
 166             return UNZ_ERRNO;
 167         else
 168             return UNZ_EOF;
 169     }
 170 }
 171
 172
 173 /* ===========================================================================
 174    Reads a long in LSB order from the given gz_stream. Sets
 175 */
 176 local int unzlocal_getShort (fin,pX)
 177         FILE* fin;
 178     uLong *pX;
 179 {
 180     uLong x ;
 181     int i;
 182     int err;
 183
 184     err = unzlocal_getByte(fin,&i);
 185     x = (uLong)i;
 186
 187     if (err==UNZ_OK)
 188         err = unzlocal_getByte(fin,&i);
 189     x += ((uLong)i)<<8;
 190
 191     if (err==UNZ_OK)
 192         *pX = x;
 193     else
 194         *pX = 0;
 195     return err;
 196 }
 197
 198 local int unzlocal_getLong (fin,pX)
 199         FILE* fin;
 200     uLong *pX;
 201 {
 202     uLong x ;
 203     int i;
 204     int err;
 205
 206     err = unzlocal_getByte(fin,&i);
 207     x = (uLong)i;
 208
 209     if (err==UNZ_OK)
 210         err = unzlocal_getByte(fin,&i);
 211     x += ((uLong)i)<<8;
 212
 213     if (err==UNZ_OK)
 214         err = unzlocal_getByte(fin,&i);
 215     x += ((uLong)i)<<16;
 216
 217     if (err==UNZ_OK)
 218         err = unzlocal_getByte(fin,&i);
 219     x += ((uLong)i)<<24;
 220
 221     if (err==UNZ_OK)
 222         *pX = x;
 223     else
 224         *pX = 0;
 225     return err;
 226 }
 227
 228
 229 /* My own strcmpi / strcasecmp */
 230 local int strcmpcasenosensitive_internal (fileName1,fileName2)
 231         const char* fileName1;
 232         const char* fileName2;
 233 {
 234         for (;;)
 235         {
 236                 char c1=*(fileName1++);
 237                 char c2=*(fileName2++);
 238                 if ((c1>='a') && (c1<='z'))
 239                         c1 -= 0x20;
 240                 if ((c2>='a') && (c2<='z'))
 241                         c2 -= 0x20;
 242                 if (c1=='\0')
 243                         return ((c2=='\0') ? 0 : -1);
 244                 if (c2=='\0')
 245                         return 1;
 246                 if (c1<c2)
 247                         return -1;
 248                 if (c1>c2)
 249                         return 1;
 250         }
 251 }
 252
 253
 254 #ifdef  CASESENSITIVITYDEFAULT_NO
 255 #define CASESENSITIVITYDEFAULTVALUE 2
 256 #else
 257 #define CASESENSITIVITYDEFAULTVALUE 1
 258 #endif
 259
 260 #ifndef STRCMPCASENOSENTIVEFUNCTION
 261 #define STRCMPCASENOSENTIVEFUNCTION strcmpcasenosensitive_internal
 262 #endif
 263
 264 /*
 265    Compare two filename (fileName1,fileName2).
 266    If iCaseSenisivity = 1, comparision is case sensitivity (like strcmp)
 267    If iCaseSenisivity = 2, comparision is not case sensitivity (like strcmpi
 268                                                                 or strcasecmp)
 269    If iCaseSenisivity = 0, case sensitivity is defaut of your operating system
 270         (like 1 on Unix, 2 on Windows)
 271
 272 */
 273 extern int ZEXPORT unzStringFileNameCompare (fileName1,fileName2,iCaseSensitivity)
 274         const char* fileName1;
 275         const char* fileName2;
 276         int iCaseSensitivity;
 277 {
 278         if (iCaseSensitivity==0)
 279                 iCaseSensitivity=CASESENSITIVITYDEFAULTVALUE;
 280
 281         if (iCaseSensitivity==1)
 282                 return strcmp(fileName1,fileName2);
 283
 284         return STRCMPCASENOSENTIVEFUNCTION(fileName1,fileName2);
 285 }
 286
 287 #define BUFREADCOMMENT (0x400)
 288
 289 /*
 290   Locate the Central directory of a zipfile (at the end, just before
 291     the global comment)
 292 */
 293 local uLong unzlocal_SearchCentralDir(fin)
 294         FILE *fin;
 295 {
 296         unsigned char* buf;
 297         uLong uSizeFile;
 298         uLong uBackRead;
 299         uLong uMaxBack=0xffff; /* maximum size of global comment */
 300         uLong uPosFound=0;
 301
 302         if (fseek(fin,0,SEEK_END) != 0)
 303                 return 0;
 304
 305
 306         uSizeFile = ftell( fin );
 307
 308         if (uMaxBack>uSizeFile)
 309                 uMaxBack = uSizeFile;
 310
 311         buf = (unsigned char*)ALLOC(BUFREADCOMMENT+4);
 312         if (buf==NULL)
 313                 return 0;
 314
 315         uBackRead = 4;
 316         while (uBackRead<uMaxBack)
 317         {
 318                 uLong uReadSize,uReadPos ;
 319                 int i;
 320                 if (uBackRead+BUFREADCOMMENT>uMaxBack)
 321                         uBackRead = uMaxBack;
 322                 else
 323                         uBackRead+=BUFREADCOMMENT;
 324                 uReadPos = uSizeFile-uBackRead ;
 325
 326                 uReadSize = ((BUFREADCOMMENT+4) < (uSizeFile-uReadPos)) ?
 327                      (BUFREADCOMMENT+4) : (uSizeFile-uReadPos);
 328                 if (fseek(fin,uReadPos,SEEK_SET)!=0)
 329                         break;
 330
 331                 if (fread(buf,(uInt)uReadSize,1,fin)!=1)
 332                         break;
 333
 334                 for (i=(int)uReadSize-3; (i--)>0;)
 335                         if (((*(buf+i))==0x50) && ((*(buf+i+1))==0x4b) &&
 336                                 ((*(buf+i+2))==0x05) && ((*(buf+i+3))==0x06))
 337                         {
 338                                 uPosFound = uReadPos+i;
 339                                 break;
 340                         }
 341
 342                 if (uPosFound!=0)
 343                         break;
 344         }
 345         TRYFREE(buf);
 346         return uPosFound;
 347 }
 348
 349 /*
 350   Open a Zip file. path contain the full pathname (by example,
 351      on a Windows NT computer "c:\\test\\zlib109.zip" or on an Unix computer
 352          "zlib/zlib109.zip".
 353          If the zipfile cannot be opened (file don't exist or in not valid), the
 354            return value is NULL.
 355      Else, the return value is a unzFile Handle, usable with other function
 356            of this unzip package.
 357 */
 358 extern unzFile ZEXPORT unzOpen (path)
 359         const char *path;
 360 {
 361         unz_s us;
 362         unz_s *s;
 363         uLong central_pos,uL;
 364         FILE * fin ;
 365
 366         uLong number_disk;          /* number of the current dist, used for
 367                                                                    spaning ZIP, unsupported, always 0*/
 368         uLong number_disk_with_CD;  /* number the the disk with central dir, used
 369                                                                    for spaning ZIP, unsupported, always 0*/
 370         uLong number_entry_CD;      /* total number of entries in
 371                                        the central dir
 372                                        (same than number_entry on nospan) */
 373
 374         int err=UNZ_OK;
 375
 376     if (unz_copyright[0]!=' ')
 377         return NULL;
 378
 379     fin=fopen(path,"rb");
 380         if (fin==NULL)
 381                 return NULL;
 382
 383         central_pos = unzlocal_SearchCentralDir(fin);
 384         if (central_pos==0)
 385                 err=UNZ_ERRNO;
 386
 387         if (fseek(fin,central_pos,SEEK_SET)!=0)
 388                 err=UNZ_ERRNO;
 389
 390         /* the signature, already checked */
 391         if (unzlocal_getLong(fin,&uL)!=UNZ_OK)
 392                 err=UNZ_ERRNO;
 393
 394         /* number of this disk */
 395         if (unzlocal_getShort(fin,&number_disk)!=UNZ_OK)
 396                 err=UNZ_ERRNO;
 397
 398         /* number of the disk with the start of the central directory */
 399         if (unzlocal_getShort(fin,&number_disk_with_CD)!=UNZ_OK)
 400                 err=UNZ_ERRNO;
 401
 402         /* total number of entries in the central dir on this disk */
 403         if (unzlocal_getShort(fin,&us.gi.number_entry)!=UNZ_OK)
 404                 err=UNZ_ERRNO;
 405
 406         /* total number of entries in the central dir */
 407         if (unzlocal_getShort(fin,&number_entry_CD)!=UNZ_OK)
 408                 err=UNZ_ERRNO;
 409
 410         if ((number_entry_CD!=us.gi.number_entry) ||
 411                 (number_disk_with_CD!=0) ||
 412                 (number_disk!=0))
 413                 err=UNZ_BADZIPFILE;
 414
 415         /* size of the central directory */
 416         if (unzlocal_getLong(fin,&us.size_central_dir)!=UNZ_OK)
 417                 err=UNZ_ERRNO;
 418
 419         /* offset of start of central directory with respect to the
 420               starting disk number */
 421         if (unzlocal_getLong(fin,&us.offset_central_dir)!=UNZ_OK)
 422                 err=UNZ_ERRNO;
 423
 424         /* zipfile comment length */
 425         if (unzlocal_getShort(fin,&us.gi.size_comment)!=UNZ_OK)
 426                 err=UNZ_ERRNO;
 427
 428         if ((central_pos<us.offset_central_dir+us.size_central_dir) &&
 429                 (err==UNZ_OK))
 430                 err=UNZ_BADZIPFILE;
 431
 432         if (err!=UNZ_OK)
 433         {
 434                 fclose(fin);
 435                 return NULL;
 436         }
 437         us.file=fin;
 438         us.byte_before_the_zipfile = central_pos -
 439                                     (us.offset_central_dir+us.size_central_dir);
 440         us.central_pos = central_pos;
 441     us.pfile_in_zip_read = NULL;
 442
 443
 444         s=(unz_s*)ALLOC(sizeof(unz_s));
 445         *s=us;
 446         unzGoToFirstFile((unzFile)s);
 447         return (unzFile)s;
 448 }
 449
 450
 451 /*
 452   Close a ZipFile opened with unzipOpen.
 453   If there is files inside the .Zip opened with unzipOpenCurrentFile (see later),
 454     these files MUST be closed with unzipCloseCurrentFile before call unzipClose.
 455   return UNZ_OK if there is no problem. */
 456 extern int ZEXPORT unzClose (file)
 457         unzFile file;
 458 {
 459         unz_s* s;
 460         if (file==NULL)
 461                 return UNZ_PARAMERROR;
 462         s=(unz_s*)file;
 463
 464     if (s->pfile_in_zip_read!=NULL)
 465         unzCloseCurrentFile(file);
 466
 467         fclose(s->file);
 468         TRYFREE(s);
 469         return UNZ_OK;
 470 }
 471
 472
 473 /*
 474   Write info about the ZipFile in the *pglobal_info structure.
 475   No preparation of the structure is needed
 476   return UNZ_OK if there is no problem. */
 477 extern int ZEXPORT unzGetGlobalInfo (file,pglobal_info)
 478         unzFile file;
 479         unz_global_info *pglobal_info;
 480 {
 481         unz_s* s;
 482         if (file==NULL)
 483                 return UNZ_PARAMERROR;
 484         s=(unz_s*)file;
 485         *pglobal_info=s->gi;
 486         return UNZ_OK;
 487 }
 488
 489
 490 /*
 491    Translate date/time from Dos format to tm_unz (readable more easilty)
 492 */
 493 local void unzlocal_DosDateToTmuDate (ulDosDate, ptm)
 494     uLong ulDosDate;
 495     tm_unz* ptm;
 496 {
 497     uLong uDate;
 498     uDate = (uLong)(ulDosDate>>16);
 499     ptm->tm_mday = (uInt)(uDate&0x1f) ;
 500     ptm->tm_mon =  (uInt)((((uDate)&0x1E0)/0x20)-1) ;
 501     ptm->tm_year = (uInt)(((uDate&0x0FE00)/0x0200)+1980) ;
 502
 503     ptm->tm_hour = (uInt) ((ulDosDate &0xF800)/0x800);
 504     ptm->tm_min =  (uInt) ((ulDosDate&0x7E0)/0x20) ;
 505     ptm->tm_sec =  (uInt) (2*(ulDosDate&0x1f)) ;
 506 }
 507
 508 /*
 509   Get Info about the current file in the zipfile, with internal only info
 510 */
 511 local int unzlocal_GetCurrentFileInfoInternal OF((unzFile file,
 512                                                   unz_file_info *pfile_info,
 513                                                   unz_file_info_internal
 514                                                   *pfile_info_internal,
 515                                                   char *szFileName,
 516                                                                                                   uLong fileNameBufferSize,
 517                                                   void *extraField,
 518                                                                                                   uLong extraFieldBufferSize,
 519                                                   char *szComment,
 520                                                                                                   uLong commentBufferSize));
 521
 522 local int unzlocal_GetCurrentFileInfoInternal (file,
 523                                               pfile_info,
 524                                               pfile_info_internal,
 525                                               szFileName, fileNameBufferSize,
 526                                               extraField, extraFieldBufferSize,
 527                                               szComment,  commentBufferSize)
 528         unzFile file;
 529         unz_file_info *pfile_info;
 530         unz_file_info_internal *pfile_info_internal;
 531         char *szFileName;
 532         uLong fileNameBufferSize;
 533         void *extraField;
 534         uLong extraFieldBufferSize;
 535         char *szComment;
 536         uLong commentBufferSize;
 537 {
 538         unz_s* s;
 539         unz_file_info file_info;
 540         unz_file_info_internal file_info_internal;
 541         int err=UNZ_OK;
 542         uLong uMagic;
 543         long lSeek=0;
 544
 545         if (file==NULL)
 546                 return UNZ_PARAMERROR;
 547         s=(unz_s*)file;
 548         if (fseek(s->file,s->pos_in_central_dir+s->byte_before_the_zipfile,SEEK_SET)!=0)
 549                 err=UNZ_ERRNO;
 550
 551
 552         /* we check the magic */
 553         if (err==UNZ_OK)
 554                 if (unzlocal_getLong(s->file,&uMagic) != UNZ_OK)
 555                         err=UNZ_ERRNO;
 556                 else if (uMagic!=0x02014b50)
 557                         err=UNZ_BADZIPFILE;
 558
 559         if (unzlocal_getShort(s->file,&file_info.version) != UNZ_OK)
 560                 err=UNZ_ERRNO;
 561
 562         if (unzlocal_getShort(s->file,&file_info.version_needed) != UNZ_OK)
 563                 err=UNZ_ERRNO;
 564
 565         if (unzlocal_getShort(s->file,&file_info.flag) != UNZ_OK)
 566                 err=UNZ_ERRNO;
 567
 568         if (unzlocal_getShort(s->file,&file_info.compression_method) != UNZ_OK)
 569                 err=UNZ_ERRNO;
 570
 571         if (unzlocal_getLong(s->file,&file_info.dosDate) != UNZ_OK)
 572                 err=UNZ_ERRNO;
 573
 574     unzlocal_DosDateToTmuDate(file_info.dosDate,&file_info.tmu_date);
 575
 576         if (unzlocal_getLong(s->file,&file_info.crc) != UNZ_OK)
 577                 err=UNZ_ERRNO;
 578
 579         if (unzlocal_getLong(s->file,&file_info.compressed_size) != UNZ_OK)
 580                 err=UNZ_ERRNO;
 581
 582         if (unzlocal_getLong(s->file,&file_info.uncompressed_size) != UNZ_OK)
 583                 err=UNZ_ERRNO;
 584
 585         if (unzlocal_getShort(s->file,&file_info.size_filename) != UNZ_OK)
 586                 err=UNZ_ERRNO;
 587
 588         if (unzlocal_getShort(s->file,&file_info.size_file_extra) != UNZ_OK)
 589                 err=UNZ_ERRNO;
 590
 591         if (unzlocal_getShort(s->file,&file_info.size_file_comment) != UNZ_OK)
 592                 err=UNZ_ERRNO;
 593
 594         if (unzlocal_getShort(s->file,&file_info.disk_num_start) != UNZ_OK)
 595                 err=UNZ_ERRNO;
 596
 597         if (unzlocal_getShort(s->file,&file_info.internal_fa) != UNZ_OK)
 598                 err=UNZ_ERRNO;
 599
 600         if (unzlocal_getLong(s->file,&file_info.external_fa) != UNZ_OK)
 601                 err=UNZ_ERRNO;
 602
 603         if (unzlocal_getLong(s->file,&file_info_internal.offset_curfile) != UNZ_OK)
 604                 err=UNZ_ERRNO;
 605
 606         lSeek+=file_info.size_filename;
 607         if ((err==UNZ_OK) && (szFileName!=NULL))
 608         {
 609                 uLong uSizeRead ;
 610                 if (file_info.size_filename<fileNameBufferSize)
 611                 {
 612                         *(szFileName+file_info.size_filename)='\0';
 613                         uSizeRead = file_info.size_filename;
 614                 }
 615                 else
 616                         uSizeRead = fileNameBufferSize;
 617
 618                 if ((file_info.size_filename>0) && (fileNameBufferSize>0))
 619                         if (fread(szFileName,(uInt)uSizeRead,1,s->file)!=1)
 620                                 err=UNZ_ERRNO;
 621                 lSeek -= uSizeRead;
 622         }
 623
 624
 625         if ((err==UNZ_OK) && (extraField!=NULL))
 626         {
 627                 uLong uSizeRead ;
 628                 if (file_info.size_file_extra<extraFieldBufferSize)
 629                         uSizeRead = file_info.size_file_extra;
 630                 else
 631                         uSizeRead = extraFieldBufferSize;
 632
 633                 if (lSeek!=0)
 634                         if (fseek(s->file,lSeek,SEEK_CUR)==0)
 635                                 lSeek=0;
 636                         else
 637                                 err=UNZ_ERRNO;
 638                 if ((file_info.size_file_extra>0) && (extraFieldBufferSize>0))
 639                         if (fread(extraField,(uInt)uSizeRead,1,s->file)!=1)
 640                                 err=UNZ_ERRNO;
 641                 lSeek += file_info.size_file_extra - uSizeRead;
 642         }
 643         else
 644                 lSeek+=file_info.size_file_extra;
 645
 646
 647         if ((err==UNZ_OK) && (szComment!=NULL))
 648         {
 649                 uLong uSizeRead ;
 650                 if (file_info.size_file_comment<commentBufferSize)
 651                 {
 652                         *(szComment+file_info.size_file_comment)='\0';
 653                         uSizeRead = file_info.size_file_comment;
 654                 }
 655                 else
 656                         uSizeRead = commentBufferSize;
 657
 658                 if (lSeek!=0)
 659                         if (fseek(s->file,lSeek,SEEK_CUR)==0)
 660                                 lSeek=0;
 661                         else
 662                                 err=UNZ_ERRNO;
 663                 if ((file_info.size_file_comment>0) && (commentBufferSize>0))
 664                         if (fread(szComment,(uInt)uSizeRead,1,s->file)!=1)
 665                                 err=UNZ_ERRNO;
 666                 lSeek+=file_info.size_file_comment - uSizeRead;
 667         }
 668         else
 669                 lSeek+=file_info.size_file_comment;
 670
 671         if ((err==UNZ_OK) && (pfile_info!=NULL))
 672                 *pfile_info=file_info;
 673
 674         if ((err==UNZ_OK) && (pfile_info_internal!=NULL))
 675                 *pfile_info_internal=file_info_internal;
 676
 677         return err;
 678 }
 679
 680
 681
 682 /*
 683   Write info about the ZipFile in the *pglobal_info structure.
 684   No preparation of the structure is needed
 685   return UNZ_OK if there is no problem.
 686 */
 687 extern int ZEXPORT unzGetCurrentFileInfo (file,
 688                                                   pfile_info,
 689                                                   szFileName, fileNameBufferSize,
 690                                                   extraField, extraFieldBufferSize,
 691                                                   szComment,  commentBufferSize)
 692         unzFile file;
 693         unz_file_info *pfile_info;
 694         char *szFileName;
 695         uLong fileNameBufferSize;
 696         void *extraField;
 697         uLong extraFieldBufferSize;
 698         char *szComment;
 699         uLong commentBufferSize;
 700 {
 701         return unzlocal_GetCurrentFileInfoInternal(file,pfile_info,NULL,
 702                                                                                                 szFileName,fileNameBufferSize,
 703                                                                                                 extraField,extraFieldBufferSize,
 704                                                                                                 szComment,commentBufferSize);
 705 }
 706
 707 /*
 708   Set the current file of the zipfile to the first file.
 709   return UNZ_OK if there is no problem
 710 */
 711 extern int ZEXPORT unzGoToFirstFile (file)
 712         unzFile file;
 713 {
 714         int err=UNZ_OK;
 715         unz_s* s;
 716         if (file==NULL)
 717                 return UNZ_PARAMERROR;
 718         s=(unz_s*)file;
 719         s->pos_in_central_dir=s->offset_central_dir;
 720         s->num_file=0;
 721         err=unzlocal_GetCurrentFileInfoInternal(file,&s->cur_file_info,
 722                                                                                          &s->cur_file_info_internal,
 723                                                                                          NULL,0,NULL,0,NULL,0);
 724         s->current_file_ok = (err == UNZ_OK);
 725         return err;
 726 }
 727
 728
 729 /*
 730   Set the current file of the zipfile to the next file.
 731   return UNZ_OK if there is no problem
 732   return UNZ_END_OF_LIST_OF_FILE if the actual file was the latest.
 733 */
 734 extern int ZEXPORT unzGoToNextFile (file)
 735         unzFile file;
 736 {
 737         unz_s* s;
 738         int err;
 739
 740         if (file==NULL)
 741                 return UNZ_PARAMERROR;
 742         s=(unz_s*)file;
 743         if (!s->current_file_ok)
 744                 return UNZ_END_OF_LIST_OF_FILE;
 745         if (s->num_file+1==s->gi.number_entry)
 746                 return UNZ_END_OF_LIST_OF_FILE;
 747
 748         s->pos_in_central_dir += SIZECENTRALDIRITEM + s->cur_file_info.size_filename +
 749                         s->cur_file_info.size_file_extra + s->cur_file_info.size_file_comment ;
 750         s->num_file++;
 751         err = unzlocal_GetCurrentFileInfoInternal(file,&s->cur_file_info,
 752                                                                                            &s->cur_file_info_internal,
 753                                                                                            NULL,0,NULL,0,NULL,0);
 754         s->current_file_ok = (err == UNZ_OK);
 755         return err;
 756 }
 757
 758
 759 /*
 760   Try locate the file szFileName in the zipfile.
 761   For the iCaseSensitivity signification, see unzipStringFileNameCompare
 762
 763   return value :
 764   UNZ_OK if the file is found. It becomes the current file.
 765   UNZ_END_OF_LIST_OF_FILE if the file is not found
 766 */
 767 extern int ZEXPORT unzLocateFile (file, szFileName, iCaseSensitivity)
 768         unzFile file;
 769         const char *szFileName;
 770         int iCaseSensitivity;
 771 {
 772         unz_s* s;
 773         int err;
 774
 775
 776         uLong num_fileSaved;
 777         uLong pos_in_central_dirSaved;
 778
 779
 780         if (file==NULL)
 781                 return UNZ_PARAMERROR;
 782
 783     if (strlen(szFileName)>=UNZ_MAXFILENAMEINZIP)
 784         return UNZ_PARAMERROR;
 785
 786         s=(unz_s*)file;
 787         if (!s->current_file_ok)
 788                 return UNZ_END_OF_LIST_OF_FILE;
 789
 790         num_fileSaved = s->num_file;
 791         pos_in_central_dirSaved = s->pos_in_central_dir;
 792
 793         err = unzGoToFirstFile(file);
 794
 795         while (err == UNZ_OK)
 796         {
 797                 char szCurrentFileName[UNZ_MAXFILENAMEINZIP+1];
 798                 unzGetCurrentFileInfo(file,NULL,
 799                                                                 szCurrentFileName,sizeof(szCurrentFileName)-1,
 800                                                                 NULL,0,NULL,0);
 801                 if (unzStringFileNameCompare(szCurrentFileName,
 802                                                                                 szFileName,iCaseSensitivity)==0)
 803                         return UNZ_OK;
 804                 err = unzGoToNextFile(file);
 805         }
 806
 807         s->num_file = num_fileSaved ;
 808         s->pos_in_central_dir = pos_in_central_dirSaved ;
 809         return err;
 810 }
 811
 812
 813 /*
 814   Read the local header of the current zipfile
 815   Check the coherency of the local header and info in the end of central
 816         directory about this file
 817   store in *piSizeVar the size of extra info in local header
 818         (filename and size of extra field data)
 819 */
 820 local int unzlocal_CheckCurrentFileCoherencyHeader (s,piSizeVar,
 821                                                                                                         poffset_local_extrafield,
 822                                                                                                         psize_local_extrafield)
 823         unz_s* s;
 824         uInt* piSizeVar;
 825         uLong *poffset_local_extrafield;
 826         uInt  *psize_local_extrafield;
 827 {
 828         uLong uMagic,uData,uFlags;
 829         uLong size_filename;
 830         uLong size_extra_field;
 831         int err=UNZ_OK;
 832
 833         *piSizeVar = 0;
 834         *poffset_local_extrafield = 0;
 835         *psize_local_extrafield = 0;
 836
 837         if (fseek(s->file,s->cur_file_info_internal.offset_curfile +
 838                                                                 s->byte_before_the_zipfile,SEEK_SET)!=0)
 839                 return UNZ_ERRNO;
 840
 841
 842         if (err==UNZ_OK)
 843                 if (unzlocal_getLong(s->file,&uMagic) != UNZ_OK)
 844                         err=UNZ_ERRNO;
 845                 else if (uMagic!=0x04034b50)
 846                         err=UNZ_BADZIPFILE;
 847
 848         if (unzlocal_getShort(s->file,&uData) != UNZ_OK)
 849                 err=UNZ_ERRNO;
 850 /*
 851         else if ((err==UNZ_OK) && (uData!=s->cur_file_info.wVersion))
 852                 err=UNZ_BADZIPFILE;
 853 */
 854         if (unzlocal_getShort(s->file,&uFlags) != UNZ_OK)
 855                 err=UNZ_ERRNO;
 856
 857         if (unzlocal_getShort(s->file,&uData) != UNZ_OK)
 858                 err=UNZ_ERRNO;
 859         else if ((err==UNZ_OK) && (uData!=s->cur_file_info.compression_method))
 860                 err=UNZ_BADZIPFILE;
 861
 862     if ((err==UNZ_OK) && (s->cur_file_info.compression_method!=0) &&
 863                          (s->cur_file_info.compression_method!=Z_DEFLATED))
 864         err=UNZ_BADZIPFILE;
 865
 866         if (unzlocal_getLong(s->file,&uData) != UNZ_OK) /* date/time */
 867                 err=UNZ_ERRNO;
 868
 869         if (unzlocal_getLong(s->file,&uData) != UNZ_OK) /* crc */
 870                 err=UNZ_ERRNO;
 871         else if ((err==UNZ_OK) && (uData!=s->cur_file_info.crc) &&
 872                                       ((uFlags & 8)==0))
 873                 err=UNZ_BADZIPFILE;
 874
 875         if (unzlocal_getLong(s->file,&uData) != UNZ_OK) /* size compr */
 876                 err=UNZ_ERRNO;
 877         else if ((err==UNZ_OK) && (uData!=s->cur_file_info.compressed_size) &&
 878                                                           ((uFlags & 8)==0))
 879                 err=UNZ_BADZIPFILE;
 880
 881         if (unzlocal_getLong(s->file,&uData) != UNZ_OK) /* size uncompr */
 882                 err=UNZ_ERRNO;
 883         else if ((err==UNZ_OK) && (uData!=s->cur_file_info.uncompressed_size) &&
 884                                                           ((uFlags & 8)==0))
 885                 err=UNZ_BADZIPFILE;
 886
 887
 888         if (unzlocal_getShort(s->file,&size_filename) != UNZ_OK)
 889                 err=UNZ_ERRNO;
 890         else if ((err==UNZ_OK) && (size_filename!=s->cur_file_info.size_filename))
 891                 err=UNZ_BADZIPFILE;
 892
 893         *piSizeVar += (uInt)size_filename;
 894
 895         if (unzlocal_getShort(s->file,&size_extra_field) != UNZ_OK)
 896                 err=UNZ_ERRNO;
 897         *poffset_local_extrafield= s->cur_file_info_internal.offset_curfile +
 898                                                                         SIZEZIPLOCALHEADER + size_filename;
 899         *psize_local_extrafield = (uInt)size_extra_field;
 900
 901         *piSizeVar += (uInt)size_extra_field;
 902
 903         return err;
 904 }
 905
 906 /*
 907   Open for reading data the current file in the zipfile.
 908   If there is no error and the file is opened, the return value is UNZ_OK.
 909 */
 910 extern int ZEXPORT unzOpenCurrentFile (file)
 911         unzFile file;
 912 {
 913         int err=UNZ_OK;
 914         int Store;
 915         uInt iSizeVar;
 916         unz_s* s;
 917         file_in_zip_read_info_s* pfile_in_zip_read_info;
 918         uLong offset_local_extrafield;  /* offset of the local extra field */
 919         uInt  size_local_extrafield;    /* size of the local extra field */
 920
 921         if (file==NULL)
 922                 return UNZ_PARAMERROR;
 923         s=(unz_s*)file;
 924         if (!s->current_file_ok)
 925                 return UNZ_PARAMERROR;
 926
 927     if (s->pfile_in_zip_read != NULL)
 928         unzCloseCurrentFile(file);
 929
 930         if (unzlocal_CheckCurrentFileCoherencyHeader(s,&iSizeVar,
 931                                 &offset_local_extrafield,&size_local_extrafield)!=UNZ_OK)
 932                 return UNZ_BADZIPFILE;
 933
 934         pfile_in_zip_read_info = (file_in_zip_read_info_s*)
 935                                                                             ALLOC(sizeof(file_in_zip_read_info_s));
 936         if (pfile_in_zip_read_info==NULL)
 937                 return UNZ_INTERNALERROR;
 938
 939         pfile_in_zip_read_info->read_buffer=(char*)ALLOC(UNZ_BUFSIZE);
 940         pfile_in_zip_read_info->offset_local_extrafield = offset_local_extrafield;
 941         pfile_in_zip_read_info->size_local_extrafield = size_local_extrafield;
 942         pfile_in_zip_read_info->pos_local_extrafield=0;
 943
 944         if (pfile_in_zip_read_info->read_buffer==NULL)
 945         {
 946                 TRYFREE(pfile_in_zip_read_info);
 947                 return UNZ_INTERNALERROR;
 948         }
 949
 950         pfile_in_zip_read_info->stream_initialised=0;
 951
 952         if ((s->cur_file_info.compression_method!=0) &&
 953         (s->cur_file_info.compression_method!=Z_DEFLATED))
 954                 err=UNZ_BADZIPFILE;
 955         Store = s->cur_file_info.compression_method==0;
 956
 957         pfile_in_zip_read_info->crc32_wait=s->cur_file_info.crc;
 958         pfile_in_zip_read_info->crc32=0;
 959         pfile_in_zip_read_info->compression_method =
 960             s->cur_file_info.compression_method;
 961         pfile_in_zip_read_info->file=s->file;
 962         pfile_in_zip_read_info->byte_before_the_zipfile=s->byte_before_the_zipfile;
 963
 964     pfile_in_zip_read_info->stream.total_out = 0;
 965
 966         if (!Store)
 967         {
 968           pfile_in_zip_read_info->stream.zalloc = (alloc_func)0;
 969           pfile_in_zip_read_info->stream.zfree = (free_func)0;
 970           pfile_in_zip_read_info->stream.opaque = (voidpf)0;
 971
 972           err=inflateInit2(&pfile_in_zip_read_info->stream, -MAX_WBITS);
 973           if (err == Z_OK)
 974             pfile_in_zip_read_info->stream_initialised=1;
 975         /* windowBits is passed < 0 to tell that there is no zlib header.
 976          * Note that in this case inflate *requires* an extra "dummy" byte
 977          * after the compressed stream in order to complete decompression and
 978          * return Z_STREAM_END.
 979          * In unzip, i don't wait absolutely Z_STREAM_END because I known the
 980          * size of both compressed and uncompressed data
 981          */
 982         }
 983         pfile_in_zip_read_info->rest_read_compressed =
 984             s->cur_file_info.compressed_size ;
 985         pfile_in_zip_read_info->rest_read_uncompressed =
 986             s->cur_file_info.uncompressed_size ;
 987
 988
 989         pfile_in_zip_read_info->pos_in_zipfile =
 990             s->cur_file_info_internal.offset_curfile + SIZEZIPLOCALHEADER +
 991                           iSizeVar;
 992
 993         pfile_in_zip_read_info->stream.avail_in = (uInt)0;
 994
 995
 996         s->pfile_in_zip_read = pfile_in_zip_read_info;
 997     return UNZ_OK;
 998 }
 999
1000
1001 /*
1002   Read bytes from the current file.
1003   buf contain buffer where data must be copied
1004   len the size of buf.
1005
1006   return the number of byte copied if somes bytes are copied
1007   return 0 if the end of file was reached
1008   return <0 with error code if there is an error
1009     (UNZ_ERRNO for IO error, or zLib error for uncompress error)
1010 */
1011 extern int ZEXPORT unzReadCurrentFile  (file, buf, len)
1012         unzFile file;
1013         voidp buf;
1014         unsigned len;
1015 {
1016         int err=UNZ_OK;
1017         uInt iRead = 0;
1018         unz_s* s;
1019         file_in_zip_read_info_s* pfile_in_zip_read_info;
1020         if (file==NULL)
1021                 return UNZ_PARAMERROR;
1022         s=(unz_s*)file;
1023     pfile_in_zip_read_info=s->pfile_in_zip_read;
1024
1025         if (pfile_in_zip_read_info==NULL)
1026                 return UNZ_PARAMERROR;
1027
1028
1029         if ((pfile_in_zip_read_info->read_buffer == NULL))
1030                 return UNZ_END_OF_LIST_OF_FILE;
1031         if (len==0)
1032                 return 0;
1033
1034         pfile_in_zip_read_info->stream.next_out = (Bytef*)buf;
1035
1036         pfile_in_zip_read_info->stream.avail_out = (uInt)len;
1037
1038         if (len>pfile_in_zip_read_info->rest_read_uncompressed)
1039                 pfile_in_zip_read_info->stream.avail_out =
1040                   (uInt)pfile_in_zip_read_info->rest_read_uncompressed;
1041
1042         while (pfile_in_zip_read_info->stream.avail_out>0)
1043         {
1044                 if ((pfile_in_zip_read_info->stream.avail_in==0) &&
1045             (pfile_in_zip_read_info->rest_read_compressed>0))
1046                 {
1047                         uInt uReadThis = UNZ_BUFSIZE;
1048                         if (pfile_in_zip_read_info->rest_read_compressed<uReadThis)
1049                                 uReadThis = (uInt)pfile_in_zip_read_info->rest_read_compressed;
1050                         if (uReadThis == 0)
1051                                 return UNZ_EOF;
1052                         if (fseek(pfile_in_zip_read_info->file,
1053                       pfile_in_zip_read_info->pos_in_zipfile +
1054                          pfile_in_zip_read_info->byte_before_the_zipfile,SEEK_SET)!=0)
1055                                 return UNZ_ERRNO;
1056                         if (fread(pfile_in_zip_read_info->read_buffer,uReadThis,1,
1057                          pfile_in_zip_read_info->file)!=1)
1058                                 return UNZ_ERRNO;
1059                         pfile_in_zip_read_info->pos_in_zipfile += uReadThis;
1060
1061                         pfile_in_zip_read_info->rest_read_compressed-=uReadThis;
1062
1063                         pfile_in_zip_read_info->stream.next_in =
1064                 (Bytef*)pfile_in_zip_read_info->read_buffer;
1065                         pfile_in_zip_read_info->stream.avail_in = (uInt)uReadThis;
1066                 }
1067
1068                 if (pfile_in_zip_read_info->compression_method==0)
1069                 {
1070                         uInt uDoCopy,i ;
1071                         if (pfile_in_zip_read_info->stream.avail_out <
1072                             pfile_in_zip_read_info->stream.avail_in)
1073                                 uDoCopy = pfile_in_zip_read_info->stream.avail_out ;
1074                         else
1075                                 uDoCopy = pfile_in_zip_read_info->stream.avail_in ;
1076
1077                         for (i=0;i<uDoCopy;i++)
1078                                 *(pfile_in_zip_read_info->stream.next_out+i) =
1079                         *(pfile_in_zip_read_info->stream.next_in+i);
1080
1081                         pfile_in_zip_read_info->crc32 = crc32(pfile_in_zip_read_info->crc32,
1082                                                                 pfile_in_zip_read_info->stream.next_out,
1083                                                                 uDoCopy);
1084                         pfile_in_zip_read_info->rest_read_uncompressed-=uDoCopy;
1085                         pfile_in_zip_read_info->stream.avail_in -= uDoCopy;
1086                         pfile_in_zip_read_info->stream.avail_out -= uDoCopy;
1087                         pfile_in_zip_read_info->stream.next_out += uDoCopy;
1088                         pfile_in_zip_read_info->stream.next_in += uDoCopy;
1089             pfile_in_zip_read_info->stream.total_out += uDoCopy;
1090                         iRead += uDoCopy;
1091                 }
1092                 else
1093                 {
1094                         uLong uTotalOutBefore,uTotalOutAfter;
1095                         const Bytef *bufBefore;
1096                         uLong uOutThis;
1097                         int flush=Z_SYNC_FLUSH;
1098
1099                         uTotalOutBefore = pfile_in_zip_read_info->stream.total_out;
1100                         bufBefore = pfile_in_zip_read_info->stream.next_out;
1101
1102                         /*
1103                         if ((pfile_in_zip_read_info->rest_read_uncompressed ==
1104                                  pfile_in_zip_read_info->stream.avail_out) &&
1105                                 (pfile_in_zip_read_info->rest_read_compressed == 0))
1106                                 flush = Z_FINISH;
1107                         */
1108                         err=inflate(&pfile_in_zip_read_info->stream,flush);
1109
1110                         uTotalOutAfter = pfile_in_zip_read_info->stream.total_out;
1111                         uOutThis = uTotalOutAfter-uTotalOutBefore;
1112
1113                         pfile_in_zip_read_info->crc32 =
1114                 crc32(pfile_in_zip_read_info->crc32,bufBefore,
1115                         (uInt)(uOutThis));
1116
1117                         pfile_in_zip_read_info->rest_read_uncompressed -=
1118                 uOutThis;
1119
1120                         iRead += (uInt)(uTotalOutAfter - uTotalOutBefore);
1121
1122                         if (err==Z_STREAM_END)
1123                                 return (iRead==0) ? UNZ_EOF : iRead;
1124                         if (err!=Z_OK)
1125                                 break;
1126                 }
1127         }
1128
1129         if (err==Z_OK)
1130                 return iRead;
1131         return err;
1132 }
1133
1134
1135 /*
1136   Give the current position in uncompressed data
1137 */
1138 extern z_off_t ZEXPORT unztell (file)
1139         unzFile file;
1140 {
1141         unz_s* s;
1142         file_in_zip_read_info_s* pfile_in_zip_read_info;
1143         if (file==NULL)
1144                 return UNZ_PARAMERROR;
1145         s=(unz_s*)file;
1146     pfile_in_zip_read_info=s->pfile_in_zip_read;
1147
1148         if (pfile_in_zip_read_info==NULL)
1149                 return UNZ_PARAMERROR;
1150
1151         return (z_off_t)pfile_in_zip_read_info->stream.total_out;
1152 }
1153
1154
1155 /*
1156   return 1 if the end of file was reached, 0 elsewhere
1157 */
1158 extern int ZEXPORT unzeof (file)
1159         unzFile file;
1160 {
1161         unz_s* s;
1162         file_in_zip_read_info_s* pfile_in_zip_read_info;
1163         if (file==NULL)
1164                 return UNZ_PARAMERROR;
1165         s=(unz_s*)file;
1166     pfile_in_zip_read_info=s->pfile_in_zip_read;
1167
1168         if (pfile_in_zip_read_info==NULL)
1169                 return UNZ_PARAMERROR;
1170
1171         if (pfile_in_zip_read_info->rest_read_uncompressed == 0)
1172                 return 1;
1173         else
1174                 return 0;
1175 }
1176
1177
1178
1179 /*
1180   Read extra field from the current file (opened by unzOpenCurrentFile)
1181   This is the local-header version of the extra field (sometimes, there is
1182     more info in the local-header version than in the central-header)
1183
1184   if buf==NULL, it return the size of the local extra field that can be read
1185
1186   if buf!=NULL, len is the size of the buffer, the extra header is copied in
1187         buf.
1188   the return value is the number of bytes copied in buf, or (if <0)
1189         the error code
1190 */
1191 extern int ZEXPORT unzGetLocalExtrafield (file,buf,len)
1192         unzFile file;
1193         voidp buf;
1194         unsigned len;
1195 {
1196         unz_s* s;
1197         file_in_zip_read_info_s* pfile_in_zip_read_info;
1198         uInt read_now;
1199         uLong size_to_read;
1200
1201         if (file==NULL)
1202                 return UNZ_PARAMERROR;
1203         s=(unz_s*)file;
1204     pfile_in_zip_read_info=s->pfile_in_zip_read;
1205
1206         if (pfile_in_zip_read_info==NULL)
1207                 return UNZ_PARAMERROR;
1208
1209         size_to_read = (pfile_in_zip_read_info->size_local_extrafield -
1210                                 pfile_in_zip_read_info->pos_local_extrafield);
1211
1212         if (buf==NULL)
1213                 return (int)size_to_read;
1214
1215         if (len>size_to_read)
1216                 read_now = (uInt)size_to_read;
1217         else
1218                 read_now = (uInt)len ;
1219
1220         if (read_now==0)
1221                 return 0;
1222
1223         if (fseek(pfile_in_zip_read_info->file,
1224               pfile_in_zip_read_info->offset_local_extrafield +
1225                           pfile_in_zip_read_info->pos_local_extrafield,SEEK_SET)!=0)
1226                 return UNZ_ERRNO;
1227
1228         if (fread(buf,(uInt)size_to_read,1,pfile_in_zip_read_info->file)!=1)
1229                 return UNZ_ERRNO;
1230
1231         return (int)read_now;
1232 }
1233
1234 /*
1235   Close the file in zip opened with unzipOpenCurrentFile
1236   Return UNZ_CRCERROR if all the file was read but the CRC is not good
1237 */
1238 extern int ZEXPORT unzCloseCurrentFile (file)
1239         unzFile file;
1240 {
1241         int err=UNZ_OK;
1242
1243         unz_s* s;
1244         file_in_zip_read_info_s* pfile_in_zip_read_info;
1245         if (file==NULL)
1246                 return UNZ_PARAMERROR;
1247         s=(unz_s*)file;
1248     pfile_in_zip_read_info=s->pfile_in_zip_read;
1249
1250         if (pfile_in_zip_read_info==NULL)
1251                 return UNZ_PARAMERROR;
1252
1253
1254         if (pfile_in_zip_read_info->rest_read_uncompressed == 0)
1255         {
1256                 if (pfile_in_zip_read_info->crc32 != pfile_in_zip_read_info->crc32_wait)
1257                         err=UNZ_CRCERROR;
1258         }
1259
1260
1261         TRYFREE(pfile_in_zip_read_info->read_buffer);
1262         pfile_in_zip_read_info->read_buffer = NULL;
1263         if (pfile_in_zip_read_info->stream_initialised)
1264                 inflateEnd(&pfile_in_zip_read_info->stream);
1265
1266         pfile_in_zip_read_info->stream_initialised = 0;
1267         TRYFREE(pfile_in_zip_read_info);
1268
1269     s->pfile_in_zip_read=NULL;
1270
1271         return err;
1272 }
1273
1274
1275 /*
1276   Get the global comment string of the ZipFile, in the szComment buffer.
1277   uSizeBuf is the size of the szComment buffer.
1278   return the number of byte copied or an error code <0
1279 */
1280 extern int ZEXPORT unzGetGlobalComment (file, szComment, uSizeBuf)
1281         unzFile file;
1282         char *szComment;
1283         uLong uSizeBuf;
1284 {
1285         int err=UNZ_OK;
1286         unz_s* s;
1287         uLong uReadThis ;
1288         if (file==NULL)
1289                 return UNZ_PARAMERROR;
1290         s=(unz_s*)file;
1291
1292         uReadThis = uSizeBuf;
1293         if (uReadThis>s->gi.size_comment)
1294                 uReadThis = s->gi.size_comment;
1295
1296         if (fseek(s->file,s->central_pos+22,SEEK_SET)!=0)
1297                 return UNZ_ERRNO;
1298
1299         if (uReadThis>0)
1300     {
1301       *szComment='\0';
1302           if (fread(szComment,(uInt)uReadThis,1,s->file)!=1)
1303                 return UNZ_ERRNO;
1304     }
1305
1306         if ((szComment != NULL) && (uSizeBuf > s->gi.size_comment))
1307                 *(szComment+s->gi.size_comment)='\0';
1308         return (int)uReadThis;
1309 }
1310
1311 #else
1312
1313 /* the file shouldn't be empty, som compilers don't like it */
1314 static const int dummyVariableInUnzip = 17;
1315
1316 #endif /* wxUSE_ZLIB && wxUSE_ZIPSTREAM */