core: Make use of the "size-hint" in engine-gpg.

* src/engine-gpg.c: Include data.h.
(add_input_size_hint): New.
(gpg_decrypt, gpg_encrypt, gpg_encrypt_sign, gpg_sign)
(gpg_verify): Call new function,

* tests/run-encrypt.c (status_cb): Print to stderr.
(progress_cb): New.o
(main): Add option --progress.  Print full-status lines.  Provide a
size for the input data.

Signed-off-by: Werner Koch <[email protected]>

1 files changed, 24 insertions, 0 deletions

diff --git a/doc/gpgme.texi b/doc/gpgme.texi
index 2bbed285..8b0ec528 100644
--- a/doc/gpgme.texi
+++ b/doc/gpgme.texi
@@ -2177,6 +2177,30 @@ The function @code{gpgme_data_set_encoding} changes the encoding of
 the data object with the handle @var{dh} to @var{enc}.
 @end deftypefun
 
+@deftypefun {gpgme_error_t} gpgme_data_set_flag  @
+            (@w{gpgme_data_t @var{dh}}, @
+            @w{const char *@var{name}}, @
+            @w{const char *@var{value}})
+
+Some minor properties of the data object can be controlled with flags
+set by this function.  The properties are identified by the following
+values for @var{name}:
+
+@table @code
+@item size-hint
+The value is a decimal number with the length gpgme shall assume for
+this data object.  This is useful if the data is provided by callbacks
+or via file descriptors but the applications knows the total size of
+the data.  If this is set the OpenPGP engine may use this to decide on
+buffer allocation strategies and to provide a total value for its
+progress information.
+
+@end table
+
+This function returns @code{0} on success.
+@end deftypefun
+
+
 @node Data Buffer Convenience
 @subsection Data Buffer Convenience Functions
 @cindex data buffer, convenience