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Allow FpPrint data to be extended on enrollment.

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* Allow FPI_PRINT_NBIS to be extended rather than overridden if a user
  supplies an existing FpPrint template with data;
* Prints will only be extended if a device has the required feature.
  For image-based devices this feature is added by default since they
  typically do not have storage (this can be overridden at the child
  class level).

Extending an existing FpPrint requires passing a template print with
existing data during the enrollment process. This is done because the
caller is responsible for maintaining the fingerprint database and doing
the necessary deserialization operations if needed. The existing
example program is updated to show how to do that.
This commit is contained in:
Dmitrii Shcherbakov
2021-08-29 14:18:29 +03:00
committed by Benjamin Berg
parent e198b04222
commit 999bca076c
9 changed files with 305 additions and 52 deletions
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54
examples/storage.c
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@@ -102,8 +102,23 @@ save_data (GVariant *data)
return 0;
}
static FpPrint *
load_print_from_data (GVariant *data)
{
const guchar *stored_data = NULL;
gsize stored_len;
FpPrint *print;
g_autoptr(GError) error = NULL;
stored_data = (const guchar *) g_variant_get_fixed_array (data, &stored_len, 1);
print = fp_print_deserialize (stored_data, stored_len, &error);
if (error)
g_warning ("Error deserializing data: %s", error->message);
return print;
}
int
print_data_save (FpPrint *print, FpFinger finger)
print_data_save (FpPrint *print, FpFinger finger, gboolean update_fingerprint)
{
g_autofree gchar *descr = get_print_data_descriptor (print, NULL, finger);
@@ -137,25 +152,12 @@ print_data_load (FpDevice *dev, FpFinger finger)
g_autoptr(GVariant) val = NULL;
g_autoptr(GVariantDict) dict = NULL;
const guchar *stored_data = NULL;
gsize stored_len;
dict = load_data ();
val = g_variant_dict_lookup_value (dict, descr, G_VARIANT_TYPE ("ay"));
if (val)
{
FpPrint *print;
g_autoptr(GError) error = NULL;
stored_data = (const guchar *) g_variant_get_fixed_array (val, &stored_len, 1);
print = fp_print_deserialize (stored_data, stored_len, &error);
if (error)
g_warning ("Error deserializing data: %s", error->message);
return print;
}
return load_print_from_data (val);
return NULL;
}
@@ -207,16 +209,30 @@ gallery_data_load (FpDevice *dev)
}
FpPrint *
print_create_template (FpDevice *dev, FpFinger finger)
print_create_template (FpDevice *dev, FpFinger finger, gboolean load_existing)
{
g_autoptr(GVariantDict) dict = NULL;
g_autoptr(GDateTime) datetime = NULL;
g_autoptr(GDate) date = NULL;
g_autoptr(GVariant) existing_val = NULL;
g_autofree gchar *descr = get_print_data_descriptor (NULL, dev, finger);
FpPrint *template = NULL;
gint year, month, day;
template = fp_print_new (dev);
fp_print_set_finger (template, finger);
fp_print_set_username (template, g_get_user_name ());
if (load_existing)
{
dict = load_data ();
existing_val = g_variant_dict_lookup_value (dict, descr, G_VARIANT_TYPE ("ay"));
if (existing_val != NULL)
template = load_print_from_data (existing_val);
}
if (template == NULL)
{
template = fp_print_new (dev);
fp_print_set_finger (template, finger);
fp_print_set_username (template, g_get_user_name ());
}
datetime = g_date_time_new_now_local ();
g_date_time_get_ymd (datetime, &year, &month, &day);
date = g_date_new_dmy (day, month, year);