Hi all,

To my delight I found out that FPC actually provides quite a few archive handling libraries out of the box. Thanks to all that have contributed to that! So far I found:

* tar
* tar.gz
* zip

Are there any other formats out there that I could use like out of the box?

TIA!

Darius

On 2020-08-20 17:10, Darius Blaszyk via fpc-pascal wrote:

Hi,

bzip2 is directly supported in FPC packages as well.

There are 3rd party Pascal units supporting work with other archive formats (mostly listing and decompression) either using shared libraries, or containing direct implementation of certain functionality (there has been e.g. unrar.pas containing a port of the original C implementation to Pascal, although it wouldn't support current RAR format versions) and which might be compiled with FPC rather easily, but you're on your own there, of course.

Tomas

Tomas Hajny:

As a last resort, one might invoke the required archiver executable, passing to it any necessary parameters. Far Manager's MultiArc universal plugin works exactly that way, and is easily configurable via invocation patterns with macros.

I found it thanks! Any example for compressing to bzip2? The examples folder seems to contain two examples how to decompress, although the name would suggest otherwise.

What about peazip, is there anyone on this mailing list that can tell how this software works? Does it have native pascal implementations or does it work with wrappers to libraries?

Sorry for asking, but I need it for providing different archives in a buildbot project. I want to cover as much as possible formats without delving too much into detail.

Rgds, Darius

On Thu, Aug 20, 2020 at 5:58 PM Tomas Hajny via fpc-pascal <

There's also bzip2 and chm (though I don't really consider that an archive format).  I don't see anything for arj or rar though, both of which I use extensively.  Perhaps I'll see what I can do about those two.  arj should be easy enough, since unarj source is available, it should be convertable.  Having not worked on such a project though, I haven't a clue how much work it will be, but what the heck.

I have done so for the xz format already. The code checks first if the utility is available and then invokes it. Potentially any other utility might be included that way. However, I was hoping to include mainly native libraries where possible to reduce dependencies.

TIA!

Darius

On Thu, Aug 20, 2020 at 5:58 PM Tomas Hajny via fpc-pascal <

I had a second look at the bzip2 unit. Unless I am missing something this unfortunately looks to be a decompression only implementation!

Rgds, Darius

Il 20/08/2020 17:10, Darius Blaszyk via fpc-pascal ha scritto:

I have taken the naked LZH (LH5) by Okumura-Yoshizaki from the SWAG and I added his historical format archive around it, though in a minimal form. You can find it at the link

http://digilander.libero.it/oldpumpkin

in the entry "Lempel-(Ziv)-Huffman arc".
The executable herein is in Dos32 but it compiles even for Windows.

Thank you Marco! I will have a

On Fri, Aug 21, 2020 at 11:04 AM Marco Borsari via fpc-pascal <

By calling the archive utility from the command line I am able to add more formats easily. One thing though is that to be more robust I would like to check the availability of the utility from the command line. One way of doing this is using "whereis", but I was wondering if something like this exists already in FPC?

Rgds, Darius

Yes:

https://www.freepascal.org/docs-html/current/rtl/sysutils/exesearch.html

Combine with GetEnvironmentVariable():

Exists:=ExeSearch('myexe',GetEnvironmentVariable('PATH'));

Michael.

Thank you Michael!