in zlib/contrib/minizip/zip.c [842:1043]
local int LoadCentralDirectoryRecord(zip64_internal* pziinit) {
int err=ZIP_OK;
ZPOS64_T byte_before_the_zipfile;/* byte before the zipfile, (>0 for sfx)*/
ZPOS64_T size_central_dir; /* size of the central directory */
ZPOS64_T offset_central_dir; /* offset of start of central directory */
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 of the disk with central dir, used
for spanning ZIP, unsupported, always 0*/
ZPOS64_T number_entry;
ZPOS64_T number_entry_CD; /* total number of entries in
the central dir
(same than number_entry on nospan) */
uLong VersionMadeBy;
uLong VersionNeeded;
uLong size_comment;
int hasZIP64Record = 0;
// check first if we find a ZIP64 record
central_pos = zip64local_SearchCentralDir64(&pziinit->z_filefunc,pziinit->filestream);
if(central_pos > 0)
{
hasZIP64Record = 1;
}
else if(central_pos == 0)
{
central_pos = zip64local_SearchCentralDir(&pziinit->z_filefunc,pziinit->filestream);
}
/* disable to allow appending to empty ZIP archive
if (central_pos==0)
err=ZIP_ERRNO;
*/
if(hasZIP64Record)
{
ZPOS64_T sizeEndOfCentralDirectory;
if (ZSEEK64(pziinit->z_filefunc, pziinit->filestream, central_pos, ZLIB_FILEFUNC_SEEK_SET) != 0)
err=ZIP_ERRNO;
/* the signature, already checked */
if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream,&uL)!=ZIP_OK)
err=ZIP_ERRNO;
/* size of zip64 end of central directory record */
if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream, &sizeEndOfCentralDirectory)!=ZIP_OK)
err=ZIP_ERRNO;
/* version made by */
if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &VersionMadeBy)!=ZIP_OK)
err=ZIP_ERRNO;
/* version needed to extract */
if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &VersionNeeded)!=ZIP_OK)
err=ZIP_ERRNO;
/* number of this disk */
if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream,&number_disk)!=ZIP_OK)
err=ZIP_ERRNO;
/* number of the disk with the start of the central directory */
if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream,&number_disk_with_CD)!=ZIP_OK)
err=ZIP_ERRNO;
/* total number of entries in the central directory on this disk */
if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream, &number_entry)!=ZIP_OK)
err=ZIP_ERRNO;
/* total number of entries in the central directory */
if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->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 (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream,&size_central_dir)!=ZIP_OK)
err=ZIP_ERRNO;
/* offset of start of central directory with respect to the
starting disk number */
if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream,&offset_central_dir)!=ZIP_OK)
err=ZIP_ERRNO;
// TODO..
// read the comment from the standard central header.
size_comment = 0;
}
else
{
// Read End of central Directory info
if (ZSEEK64(pziinit->z_filefunc, pziinit->filestream, central_pos,ZLIB_FILEFUNC_SEEK_SET)!=0)
err=ZIP_ERRNO;
/* the signature, already checked */
if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream,&uL)!=ZIP_OK)
err=ZIP_ERRNO;
/* number of this disk */
if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream,&number_disk)!=ZIP_OK)
err=ZIP_ERRNO;
/* number of the disk with the start of the central directory */
if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream,&number_disk_with_CD)!=ZIP_OK)
err=ZIP_ERRNO;
/* total number of entries in the central dir on this disk */
number_entry = 0;
if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &uL)!=ZIP_OK)
err=ZIP_ERRNO;
else
number_entry = uL;
/* total number of entries in the central dir */
number_entry_CD = 0;
if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &uL)!=ZIP_OK)
err=ZIP_ERRNO;
else
number_entry_CD = uL;
if ((number_entry_CD!=number_entry) || (number_disk_with_CD!=0) || (number_disk!=0))
err=ZIP_BADZIPFILE;
/* size of the central directory */
size_central_dir = 0;
if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream, &uL)!=ZIP_OK)
err=ZIP_ERRNO;
else
size_central_dir = uL;
/* offset of start of central directory with respect to the starting disk number */
offset_central_dir = 0;
if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream, &uL)!=ZIP_OK)
err=ZIP_ERRNO;
else
offset_central_dir = uL;
/* zipfile global comment length */
if (zip64local_getShort(&pziinit->z_filefunc, pziinit->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)
{
ZCLOSE64(pziinit->z_filefunc, pziinit->filestream);
return ZIP_ERRNO;
}
if (size_comment>0)
{
pziinit->globalcomment = (char*)ALLOC(size_comment+1);
if (pziinit->globalcomment)
{
size_comment = ZREAD64(pziinit->z_filefunc, pziinit->filestream, pziinit->globalcomment,size_comment);
pziinit->globalcomment[size_comment]=0;
}
}
byte_before_the_zipfile = central_pos - (offset_central_dir+size_central_dir);
pziinit->add_position_when_writing_offset = byte_before_the_zipfile;
{
ZPOS64_T size_central_dir_to_read = size_central_dir;
size_t buf_size = SIZEDATA_INDATABLOCK;
void* buf_read = (void*)ALLOC(buf_size);
if (ZSEEK64(pziinit->z_filefunc, pziinit->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))
{
ZPOS64_T read_this = SIZEDATA_INDATABLOCK;
if (read_this > size_central_dir_to_read)
read_this = size_central_dir_to_read;
if (ZREAD64(pziinit->z_filefunc, pziinit->filestream,buf_read,(uLong)read_this) != read_this)
err=ZIP_ERRNO;
if (err==ZIP_OK)
err = add_data_in_datablock(&pziinit->central_dir,buf_read, (uLong)read_this);
size_central_dir_to_read-=read_this;
}
free(buf_read);
}
pziinit->begin_pos = byte_before_the_zipfile;
pziinit->number_entry = number_entry_CD;
if (ZSEEK64(pziinit->z_filefunc, pziinit->filestream, offset_central_dir+byte_before_the_zipfile,ZLIB_FILEFUNC_SEEK_SET) != 0)
err=ZIP_ERRNO;
return err;
}