2 Gig

Ray

Delphi Developer

Sun, 09 Oct 2005 17:17:58 GMT

Compression library for files > 2 Gig

Since the zip format appears to have problems with files > 2 Gig in size,
can anybody recommend a reliable compression library (preferably VCL) for
large files? Speed is secondary.

Thanks in advance.

--
Regards
Ray Mond

Leo Marti

Delphi Developer

Sun, 09 Oct 2005 18:50:02 GMT

Re:Compression library for files > 2 Gig

No, ZipForge supports compression of files > 2Gb since version 2.00.
It's a new Zip64 format. Check the last version:
www.aidaim.com/products/delphi.php#ZF

Quote

Ray wrote:
> Strange, because using both Winzip and ZipForge from AidAim, it's not
> possible to zip a file > 2 Gig.

> --
> Regards
> Ray Mond

--
Best regards,
Leo Martin,
AidAim Software LLC,
http://www.aidaim.com
Compression, encryption and database components

Uffe Kousgaar

Delphi Developer

Sun, 09 Oct 2005 18:36:59 GMT

Re:Compression library for files > 2 Gig

I would have thought Winzip could do it. I'll try and ask if I can find
out, who has actually done the zipping.

Quote

"Ray" <yeoh...@hotmail.com> wrote in message

news:3ea66c3f@newsgroups.borland.com...

Quote

> Strange, because using both Winzip and ZipForge from AidAim, it's not
> possible to zip a file > 2 Gig.

> --
> Regards
> Ray Mond

Ray

Delphi Developer

Sun, 09 Oct 2005 18:34:38 GMT

Re:Compression library for files > 2 Gig

Strange, because using both Winzip and ZipForge from AidAim, it's not
possible to zip a file > 2 Gig.

--
Regards
Ray Mond

Uffe Kousgaar

Delphi Developer

Sun, 09 Oct 2005 18:31:06 GMT

Re:Compression library for files > 2 Gig

I have received 15 GB XML files zipped to app. 1 GB. They unzipped OK,
but I don't know what was used for zipping them.

Quote

"Ray" <yeoh...@hotmail.com> wrote in message

news:3ea65a47$1@newsgroups.borland.com...

Quote

> Since the zip format appears to have problems with files > 2 Gig in
size,
> can anybody recommend a reliable compression library (preferably VCL)
for
> large files? Speed is secondary.

> Thanks in advance.

> --
> Regards
> Ray Mond

Ray

Delphi Developer

Sun, 09 Oct 2005 18:54:15 GMT

Re:Compression library for files > 2 Gig

I'll try it again. Thanks.

--
Regards
Ray Mond

Quote

"Leo Martin" <supp...@aidaim.com> wrote in message

news:3EA66FDA.DA904B60@aidaim.com...

Quote

> No, ZipForge supports compression of files > 2Gb since version 2.00.
> It's a new Zip64 format. Check the last version:
> www.aidaim.com/products/delphi.php#ZF

> Ray wrote:

> > Strange, because using both Winzip and ZipForge from AidAim, it's not
> > possible to zip a file > 2 Gig.

> > --
> > Regards
> > Ray Mond

> --
> Best regards,
> Leo Martin,
> AidAim Software LLC,
> http://www.aidaim.com
> Compression, encryption and database components

Nauseda

Delphi Developer

Sun, 09 Oct 2005 19:13:04 GMT

Re:Compression library for files > 2 Gig

In article <3ea65a4...@newsgroups.borland.com>, yeoh...@hotmail.com
says...

Quote

> Since the zip format appears to have problems with files > 2 Gig in size,
> can anybody recommend a reliable compression library (preferably VCL) for
> large files? Speed is secondary.

If you want to stick with a zip library you have to look out for a
library with zip64 support. The zip64 extension was developed by
the inventors of the zip format (Pkware) and supports archives with
virtually unlimited size.

Depending on your needs you could also have a look at www.sqx-
archiver.org. This archiver/library suports archivers > 4 GB,
strong encryption and the compression results are similar to those
of WinRAR and Winace. However, the libaray is not VCL, but it comes
along with interface units for Delphi and C++ Builder. The librry
is free.

Best regards,

R.Nausedat

Sanford Aranof

Delphi Developer

Sun, 09 Oct 2005 21:21:47 GMT

Re:Compression library for files > 2 Gig

Does this sqx code support zip files also?

Quote

> Depending on your needs you could also have a look at www.sqx-
> archiver.org. This archiver/library suports archivers > 4 GB,
> strong encryption and the compression results are similar to those
> of WinRAR and Winace. However, the libaray is not VCL, but it comes
> along with interface units for Delphi and C++ Builder. The librry
> is free.

> Best regards,

> R.Nausedat

Nauseda

Delphi Developer

Sun, 09 Oct 2005 21:50:45 GMT

Re:Compression library for files > 2 Gig

In article <3EA6936B.89D15...@analysis-knowledge.com>,
aran...@analysis-knowledge.com says...

Quote

> Does this sqx code support zip files also?

No, the library creates native archives. As said, the library has
support for strong encrytion, data recovery records, archive
directory encryption and so on, and this wouldn't be possible with
the zip format.

Best regards,

R.Nausedat

Dennis Passmor

Delphi Developer

Mon, 10 Oct 2005 03:43:54 GMT

Re:Compression library for files > 2 Gig

The only problem with ZIP format is that the ZIP archive itself cannot be larger than 4gig (2gig in
some implementations). This is because the internal ZIP sturcture uses integers to describe itself.
Some implementations such as WinZip have overloaded the integers as cardinal to get to 4gig but
other than that you have to have Winzip split the files into compressed segments in order to handle
larger archives.

Dennis Passmore
Ultimate Software, Inc

"If you cannot conceive the idea you
will never achieve the desired results"

Leo Marti

Delphi Developer

Mon, 10 Oct 2005 15:06:12 GMT

Re:Compression library for files > 2 Gig

That's not correct. PKWARE extended Zip format to new Zip64 format that allows to make zip archives up
to 2^64 bytes. AFAIK our ZipForge is the only component for Delphi that supports Zip64.
You can read more about Zip format on PKWARE web site:

http://www.pkware.com/products/enterprise/white_papers/appnote.html

Quote

Dennis Passmore wrote:
> The only problem with ZIP format is that the ZIP archive itself cannot be larger than 4gig (2gig in
> some implementations). This is because the internal ZIP sturcture uses integers to describe itself.
> Some implementations such as WinZip have overloaded the integers as cardinal to get to 4gig but
> other than that you have to have Winzip split the files into compressed segments in order to handle
> larger archives.

> Dennis Passmore
> Ultimate Software, Inc

> "If you cannot conceive the idea you
> will never achieve the desired results"

--
Best regards,
Leo Martin,
AidAim Software LLC,
http://www.aidaim.com
Compression, encryption and database components

Dennis Passmor

Delphi Developer

Thu, 13 Oct 2005 21:55:41 GMT

Re:Compression library for files > 2 Gig

Quote

>That's not correct.

Please note,

I was specifically talking about the ZIP file format and not Zip64 which is not supported by 99% of
the ZIP archiver utilities available.

Dennis Passmore
Ultimate Software, Inc

"If you cannot conceive the idea you
will never achieve the desired results"

Leo Marti

Delphi Developer

Fri, 14 Oct 2005 15:46:10 GMT

Re:Compression library for files > 2 Gig

Did you looked at original PKZIP by PKWare or PowerArc?
They both supports Zip64.
If you mean that 99% is the WinZip... :-)

Quote

Dennis Passmore wrote:
> >That's not correct.

> Please note,

> I was specifically talking about the ZIP file format and not Zip64 which is not supported by 99% of
> the ZIP archiver utilities available.

> Dennis Passmore
> Ultimate Software, Inc

> "If you cannot conceive the idea you
> will never achieve the desired results"

--
Best regards,
Leo Martin,
AidAim Software LLC,
http://www.aidaim.com
Compression, encryption and database components

Other Threads

1. BDE Table/Blob file size limit of 2 GIG

2. PRESS RELEASE: Xceed Zip Compression Library released

3. PRESS RELEASE: Xceed Zip Compression Library v3.0 released

4. PKWare Data Compression Library Compatiblity

5. Easy Compression Library v2.00

6. Tif files - how do I load and view and zoom etc tif group iv compression files

7. Compression component TStream -> TStream

8. File Compression

9. ChiefLZ v2.0: file compression sources released

10. File compression