progress callbacks

[Werner Koch]

On Fri, 7 Feb 2003 13:56:13 +0100, Marcus Brinkmann said:

> 1. How can GnuPG determine the size of the file it operates on?  For normal
>    files, this is easy enough.  If it works on a pipe, or another object of
>    undetermined size, it could emit a progress based on the amount of data
>    already processed.  In addition, it would be useful if an option could be
>    provided which can be used to set the data length that can be expected over
>    the pipe, so that programs like GPGME which provide memory backed data
>    objects would not have to deal with the absolute -> percentage conversion
>    themselves.

	the linefeed replaced by an 'X'.  "cur" is the current amount
	done and "total" is amount to be done; a "total" of 0 indicates that
	the total amount is not known.	100/100 may be used to detect the
	end of operation.

So you have to emit 0 for TOTAL and you are free to choose whatever
value for CUR - size of the processes chunk is probably a good value
for CUR.

> 2. If the gpg-agent is used, the responsibility to emit progress status
>    messages for long decryption or signing operations would have to be in
>    gpg-agent, and forwarded by gpg.

Yep.

> Is that about correct?  If yes, would such a feature be ok with the GnuPG
> maintainers?  Would it be difficult to implement?

OK.

gpg-agent is soo fast that it will never need to emit progress
messages :-)


Salam-Shalom,

   Werner