on 2013-02-17 8:45 Godfrey DiGiorgi wrote
On Sat, Feb 16, 2013 at 11:07 PM, steve harley <[email protected]> wrote:
on 2013-02-14 16:47 Godfrey DiGiorgi wrote
This is because iOS does not support external file systems, which
cannot be sandboxed. A sandboxed file system promotes security and
minimizes virus attacks, particularly important in mobile devices.
iOS does support external file systems, just in specific limited ways; one
can copy certain types of files from an SD card _to_ an iOS device (which is
the direction with security implications), but not _from_ the iOS device
back to an SD card (or other storage)
Technically true, I'll give you that, but I meant/intended
"generalized external file system support by the user." Sorry if I
didn't type the whole thought out, I thought it was obvious.
it's not about what i can assume you know, it's about what others might take
from what you write; i felt like the allusion to security implications of
writing *to* an external filesystem was hand-waving and deserved a response
If you notice, the external file system support you illustrate is only
read support,and only applies to external file system structures in
> the DCIM protocol model.
since it can delete the files that are imported, it's not read-only;
internally, iOS has access to all the filesystem support it needs from it's OS
X ancestry (not that Apple has necessarily ported it all) but whatever is there
has been abstracted to almost nothing by the time it gets to the user level
To provide generalized user-level read/write
support of an external file system would require directory system
navigation, file and folder creation, file open, file write, and file
close.
generalized support would be gravy; the mashed potatoes would be just the
simple ability to push a set of image files back to an SD card; it would be a
huge win for a minimal field photography setup, and i'm not alone in
understanding the benefits:
<http://www.robertstech.com/blog/?p=804>
Apps read and write via wireless access only to their sandboxed local
file systems.
for write support to SD cards, apps would only need to write from their
sandboxed store
It's much easier to manage authentication and security
via high-level wireless file exchange protocols.
again, i can't fathom how this matters for writing *to* SD cards
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