in zlib/contrib/minizip/unzip.c [488:665]
local unzFile unzOpenInternal(const void *path,
zlib_filefunc64_32_def* pzlib_filefunc64_32_def,
int is64bitOpenFunction) {
unz64_s us;
unz64_s *s;
ZPOS64_T central_pos;
uLong uL;
uLong number_disk; /* number of the current disk, used for
spanning ZIP, unsupported, always 0*/
uLong number_disk_with_CD; /* number the disk with central dir, used
for spanning ZIP, unsupported, always 0*/
ZPOS64_T number_entry_CD; /* total number of entries in
the central dir
(same than number_entry on nospan) */
int err=UNZ_OK;
if (unz_copyright[0]!=' ')
return NULL;
us.z_filefunc.zseek32_file = NULL;
us.z_filefunc.ztell32_file = NULL;
if (pzlib_filefunc64_32_def==NULL)
fill_fopen64_filefunc(&us.z_filefunc.zfile_func64);
else
us.z_filefunc = *pzlib_filefunc64_32_def;
us.is64bitOpenFunction = is64bitOpenFunction;
us.filestream = ZOPEN64(us.z_filefunc,
path,
ZLIB_FILEFUNC_MODE_READ |
ZLIB_FILEFUNC_MODE_EXISTING);
if (us.filestream==NULL)
return NULL;
central_pos = unz64local_SearchCentralDir64(&us.z_filefunc,us.filestream);
if (central_pos!=CENTRALDIRINVALID)
{
uLong uS;
ZPOS64_T uL64;
us.isZip64 = 1;
if (ZSEEK64(us.z_filefunc, us.filestream,
central_pos,ZLIB_FILEFUNC_SEEK_SET)!=0)
err=UNZ_ERRNO;
/* the signature, already checked */
if (unz64local_getLong(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
err=UNZ_ERRNO;
/* size of zip64 end of central directory record */
if (unz64local_getLong64(&us.z_filefunc, us.filestream,&uL64)!=UNZ_OK)
err=UNZ_ERRNO;
/* version made by */
if (unz64local_getShort(&us.z_filefunc, us.filestream,&uS)!=UNZ_OK)
err=UNZ_ERRNO;
/* version needed to extract */
if (unz64local_getShort(&us.z_filefunc, us.filestream,&uS)!=UNZ_OK)
err=UNZ_ERRNO;
/* number of this disk */
if (unz64local_getLong(&us.z_filefunc, us.filestream,&number_disk)!=UNZ_OK)
err=UNZ_ERRNO;
/* number of the disk with the start of the central directory */
if (unz64local_getLong(&us.z_filefunc, us.filestream,&number_disk_with_CD)!=UNZ_OK)
err=UNZ_ERRNO;
/* total number of entries in the central directory on this disk */
if (unz64local_getLong64(&us.z_filefunc, us.filestream,&us.gi.number_entry)!=UNZ_OK)
err=UNZ_ERRNO;
/* total number of entries in the central directory */
if (unz64local_getLong64(&us.z_filefunc, us.filestream,&number_entry_CD)!=UNZ_OK)
err=UNZ_ERRNO;
if ((number_entry_CD!=us.gi.number_entry) ||
(number_disk_with_CD!=0) ||
(number_disk!=0))
err=UNZ_BADZIPFILE;
/* size of the central directory */
if (unz64local_getLong64(&us.z_filefunc, us.filestream,&us.size_central_dir)!=UNZ_OK)
err=UNZ_ERRNO;
/* offset of start of central directory with respect to the
starting disk number */
if (unz64local_getLong64(&us.z_filefunc, us.filestream,&us.offset_central_dir)!=UNZ_OK)
err=UNZ_ERRNO;
us.gi.size_comment = 0;
}
else
{
central_pos = unz64local_SearchCentralDir(&us.z_filefunc,us.filestream);
if (central_pos==CENTRALDIRINVALID)
err=UNZ_ERRNO;
us.isZip64 = 0;
if (ZSEEK64(us.z_filefunc, us.filestream,
central_pos,ZLIB_FILEFUNC_SEEK_SET)!=0)
err=UNZ_ERRNO;
/* the signature, already checked */
if (unz64local_getLong(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
err=UNZ_ERRNO;
/* number of this disk */
if (unz64local_getShort(&us.z_filefunc, us.filestream,&number_disk)!=UNZ_OK)
err=UNZ_ERRNO;
/* number of the disk with the start of the central directory */
if (unz64local_getShort(&us.z_filefunc, us.filestream,&number_disk_with_CD)!=UNZ_OK)
err=UNZ_ERRNO;
/* total number of entries in the central dir on this disk */
if (unz64local_getShort(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
err=UNZ_ERRNO;
us.gi.number_entry = uL;
/* total number of entries in the central dir */
if (unz64local_getShort(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
err=UNZ_ERRNO;
number_entry_CD = uL;
if ((number_entry_CD!=us.gi.number_entry) ||
(number_disk_with_CD!=0) ||
(number_disk!=0))
err=UNZ_BADZIPFILE;
/* size of the central directory */
if (unz64local_getLong(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
err=UNZ_ERRNO;
us.size_central_dir = uL;
/* offset of start of central directory with respect to the
starting disk number */
if (unz64local_getLong(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
err=UNZ_ERRNO;
us.offset_central_dir = uL;
/* zipfile comment length */
if (unz64local_getShort(&us.z_filefunc, us.filestream,&us.gi.size_comment)!=UNZ_OK)
err=UNZ_ERRNO;
}
if ((central_pos<us.offset_central_dir+us.size_central_dir) &&
(err==UNZ_OK))
err=UNZ_BADZIPFILE;
if (err!=UNZ_OK)
{
ZCLOSE64(us.z_filefunc, us.filestream);
return NULL;
}
us.byte_before_the_zipfile = central_pos -
(us.offset_central_dir+us.size_central_dir);
us.central_pos = central_pos;
us.pfile_in_zip_read = NULL;
us.encrypted = 0;
s=(unz64_s*)ALLOC(sizeof(unz64_s));
if( s != NULL)
{
*s=us;
unzGoToFirstFile((unzFile)s);
}
return (unzFile)s;
}