examples: Add TOD inspector tool, to do some basic analysis of TOD drivers

Will print some drivers data

examples/meson.build

@@ -21,3 +21,13 @@ executable('cpp-test',
     'cpp-test.cpp',
     dependencies: libfprint_dep,
 )
+
+if get_option('tod')
+    executable('tod-inspector',
+        sources: 'tod-inspector.c',
+        dependencies: [
+            libfprint_dep,
+            tod_dep,
+        ],
+    )
+endif

examples/tod-inspector.c

@@ -0,0 +1,135 @@
+/*
+ * Shared library loader for libfprint
+ * Copyright (C) 2021 Marco Trevisan <marco.trevisan@canonical.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <libfprint/fprint.h>
+
+#include "libfprint/tod/tod-shared-loader.h"
+#include "libfprint/fpi-device.h"
+
+static char *
+id_table_to_string (FpDeviceType     device_type,
+                    const FpIdEntry *id_table)
+{
+  const FpIdEntry *entry;
+  char *str = NULL;
+
+  if (!id_table)
+    return g_strdup ("INVALID: Empty ID table");
+
+  entry = id_table;
+  while (TRUE)
+    {
+      g_autofree char *value = NULL;
+
+      if (device_type == FP_DEVICE_TYPE_VIRTUAL)
+        {
+          if (entry->virtual_envvar)
+            value = g_strdup (entry->virtual_envvar);
+        }
+      else if (device_type == FP_DEVICE_TYPE_USB)
+        {
+          if (entry->vid)
+            value = g_strdup_printf ("%04x:%04x", entry->vid, entry->pid);
+        }
+      else
+        {
+          return g_strdup ("Unsupported");
+        }
+
+      if (!value)
+        return str;
+
+      if (!str)
+        {
+          str = g_steal_pointer (&value);
+        }
+      else
+        {
+          g_autofree char *tmp = g_steal_pointer (&str);
+          str = g_strconcat (tmp, ", ", value, NULL);
+        }
+
+      entry++;
+    }
+
+  return str;
+}
+
+static const char *
+device_type_to_string (FpDeviceType device_type)
+{
+  g_autoptr(GEnumClass) device_types = g_type_class_ref (fp_device_type_get_type ());
+  GEnumValue *value = g_enum_get_value (device_types, device_type);
+
+  return value->value_nick;
+}
+
+static const char *
+scan_type_to_string (FpScanType scan_type)
+{
+  g_autoptr(GEnumClass) scan_types = g_type_class_ref (fp_scan_type_get_type ());
+  GEnumValue *value = g_enum_get_value (scan_types, scan_type);
+
+  return value->value_nick;
+}
+
+int
+main (void)
+{
+  g_autoptr(GArray) shared_drivers = NULL;
+  guint i;
+
+  fpi_tod_shared_drivers_register ();
+
+  shared_drivers = fpi_tod_shared_drivers_get ();
+  g_print ("Found %u drivers\n", shared_drivers->len);
+
+  for (i = 0; i < shared_drivers->len; i++)
+    {
+      GType driver = g_array_index (shared_drivers, GType, i);
+      g_autoptr(FpDeviceClass) cls = g_type_class_ref (driver);
+      g_autofree char *id_table = NULL;
+
+      id_table = id_table_to_string (cls->type, cls->id_table);
+
+      g_print ("ID: %s\n", cls->id);
+      g_print ("Full Name: %s\n", cls->full_name);
+      g_print ("Type: %s\n", device_type_to_string (cls->type));
+      g_print ("Enroll stages: %d\n", cls->nr_enroll_stages);
+      g_print ("Scan type: %s\n", scan_type_to_string (cls->scan_type));
+      g_print ("Supported Devices: %s\n", id_table);
+      g_print ("Implemented VFuncs:\n");
+      g_print ("  usb_discover: %s\n", cls->usb_discover ? "true" : "false");
+      g_print ("  probe: %s\n", cls->probe ? "true" : "false");
+      g_print ("  open: %s\n", cls->open ? "true" : "false");
+      g_print ("  close: %s\n", cls->close ? "true" : "false");
+      g_print ("  enroll: %s\n", cls->enroll ? "true" : "false");
+      g_print ("  verify: %s\n", cls->verify ? "true" : "false");
+      g_print ("  identify: %s\n", cls->identify ? "true" : "false");
+      g_print ("  capture: %s\n", cls->capture ? "true" : "false");
+      g_print ("  list: %s\n", cls->list ? "true" : "false");
+      g_print ("  delete: %s\n", cls->delete ? "true" : "false");
+      g_print ("  cancel: %s\n", cls->cancel ? "true" : "false");
+
+      if (i < shared_drivers->len - 1)
+        g_print ("------------\n");
+    }
+
+  fpi_tod_shared_drivers_unregister ();
+}

libfprint/tod/meson.build

@@ -42,12 +42,12 @@ libfprint_tod = library(versioned_libname.split('lib')[1] + '-tod',
     dependencies: deps,
     install: true)
 
-deps += declare_dependency(
+tod_dep = declare_dependency(
     link_with: [
         libfprint_tod,
         libfprint_tod_private,
-    ]
-)
+    ])
+deps += tod_dep
 
 pkgconfig = import('pkgconfig')
 pkgconfig.generate(libfprint_tod,