How to determine file types in C++ & AOS4?

Is there something like 'libmagic.so' (from linux) with extensions for Amiga specific files, like icons, PagesStream files, YAM mails, etc? Would be handy. Maybe porting libmagic would be nice and then extending it would be even more nice

regards,
nexus

@nexus

OS4 has deficons built in. From 4.1 there's API calls you can use to get the file type.

Perhaps deficons can get you where you want.

@orgin

ah, thanks, yes, I think that does the job and it's more amiga like than porting libmagic (which should be straight forward) and trying to extend it to recognize amiga specific file types.

thanks,
nexus

Edit: eh, wait. Does this only work if the file in question has an appropriate icon attached (because of IIcon->..)? What about files without icons?

Thanks again,
nexus

Edit again: Most likely, the "default icon"-setup kicks in. I will try it sooner or later :)

Thanks, the third!
nexus

@nexus

The file does not need to have an icon.

@nexus

You can use DataTypes as well:

dtn = ObtainDataTypeA (DTST_FILE, (APTR)lock, NULL)
dth = dtn->dtn_Header;

Then examine:
dth->dth_GroupID
dth->dth_Name


It really depends what you are wanting to use the filetyping for as to which is better for you, thanks to our stupid non-integrated filetyping system.

@nexus

Also, don't forget that relying on file name extensions to determine the functional (expected) contents of a file is a risky business. One which is luckily usually not necessary in AmigaOS (as illustrated above).

Best regards,

Niels