5GB files can not be FTPed


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5GB files can not be FTPed

Postby KTL » Wed, 16 Jul 2003 06:32:48 GMT

It seems like we can not FTP very large files (4GB+) with INDY.
Has anyone worked with this size transfers?
Looks like there are all intergers and not int64???????????

Re: 5GB files can not be FTPed

Postby Remy Lebeau (TeamB) » Wed, 16 Jul 2003 07:39:26 GMT

Indy uses TStream, which does not support 4GB+ files, It only supports up to

Correct.  Int64 wasn't used for TStream under Delphi/BCB v6.  However, Indy
still supports Delphi/BCB v5 at least, which don't support Int64 for


Re: 5GB files can not be FTPed

Postby Ben Hochstrasser » Wed, 16 Jul 2003 08:08:11 GMT

Which inevitably rises the question: Why so large files? (or why FTP with 
such files?). If I had an inhouse connection, I'd probably look into a 
SMB/CIFS protocol, else (aka WAN link) 4 GB is *huge*. One connection drop 
and you're dead meat, so I'd split those biggies into at least CD-sized 


Re: 5GB files can not be FTPed

Postby MpJin » Thu, 17 Jul 2003 01:53:43 GMT

I hope he doesn't upload / download 5 GB files with a 56k connection :-)



"Kyle Cordes" < XXXX@XXXXX.COM > a rit dans le message de


Re: 5GB files can not be FTPed

Postby Dan F » Thu, 17 Jul 2003 05:00:05 GMT

Dive in and alter it yourself, shouldn't be _that_ difficult.  Just to warn
you though, when doing an Int64 seek use soBeginning or soEnd etc as the
second parameter; using soFromBeginning or soFromEnd forces the 32bit
version to be used (and forces your Int64 to be casted to a 32 bit integer),
as can be seen from the TStream (or was it filestream) source, but which is
not apparent from the help files.



Re: 5GB files can not be FTPed

Postby Remy Lebeau (TeamB) » Thu, 17 Jul 2003 05:11:40 GMT

Basically, yes.  As far as I know, you'll just have to implement the FTP
protocol yourself if you want to support large files.  I haven't seen any
third-party FTP components yet that don't also use 'int' instead of 'Int64'
(that's not to say that they don't exist, it is always a possibility).

No, and for good reason - Indy is portable to non-VCLv6 IDEs, whereas the
VCLv6's Int64-capable TStream is not.  Perhaps Indy could write their own
custom Int64-capable stream class, but then it would still be limited to
TStream's existing limitations, unless they don't derive from TStream in the
first place but then compatibility with other code gets lost as a result.


Re: 5GB files can not be FTPed

Postby Yahia El-Qasem » Thu, 17 Jul 2003 07:20:58 GMT

I don't know Indy very well BUT we deal daily with pretty big files...

As far as you have a FTP server which implements APPE command correctly and
it is running on a UNIX system with large file support ( take care - not all
filesystems on UNIX are capable to deal with files > 4 GB ! ) you could get
it to work as follows :

Just upload the file in slices of 1-2 GB and APPE the next Slices till you
are finished....

This way you should be fine...


"Remy Lebeau (TeamB)" < XXXX@XXXXX.COM > schrieb im Newsbeitrag


Re: 5GB files can not be FTPed

Postby Dan F » Thu, 17 Jul 2003 18:46:28 GMT

I was just thinking that repeatedly appending 2Gb chunks, it would always
write to the end of the current file...but I forgot Indys
readstream/writestream arent Int64 compatible so maybe not.


Re: 5GB files can not be FTPed

Postby Chad Z. Hower aka Kudzu » Sun, 20 Jul 2003 00:42:59 GMT

"Remy Lebeau \(TeamB\)" < XXXX@XXXXX.COM > wrote in

Actually we could define a new type thats based on a conditional, but thats 
still a fairly big change.

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Re: 5GB files can not be FTPed

Postby Loren Pechtel » Mon, 21 Jul 2003 01:32:38 GMT

On Thu, 17 Jul 2003 14:10:46 -0700, "Remy Lebeau \(TeamB\)"

         Oh, I see--Indy itself wouldn't compile on the earlier

         Note, though, that it wouldn't need a whole bunch of
conditionals.  One would do:  BigInt = Int32 or Int64 depending on the

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