[gnome-bluetooth] lib: Add helper to deduce type from appearance

[Bastien Nocera <hadess src gnome org>]

commit 6721b84257ce2782b161286b45fb80a50f8e0c98
Author: Bastien Nocera <hadess hadess net>
Date:   Fri Nov 3 16:45:12 2017 +0100

    lib: Add helper to deduce type from appearance
    
    Bluetooth LE devices use the Appearance GAP attribute, instead of a
    device class. Add support for it so that Bluetooth LE devices are
    properly typed and with the correct icons.

 lib/bluetooth-utils.c       |   44 +++++++++++++++++++++++++++++++++++++++++++
 lib/bluetooth-utils.h       |    1 +
 lib/gnome-bluetooth.symbols |    1 +
 3 files changed, 46 insertions(+), 0 deletions(-)
---
diff --git a/lib/bluetooth-utils.c b/lib/bluetooth-utils.c
index fa7f41a..62bd53c 100644
--- a/lib/bluetooth-utils.c
+++ b/lib/bluetooth-utils.c
@@ -236,6 +236,50 @@ bluetooth_class_to_type (guint32 class)
        return 0;
 }
 
+/**
+ * bluetooth_appearance_to_type:
+ * @appearance: a Bluetooth device appearance
+ *
+ * Returns the type of device corresponding to the given @appearance value,
+ * as usually found in the GAP service.
+ *
+ * Return value: a #BluetoothType.
+ **/
+BluetoothType
+bluetooth_appearance_to_type (guint16 appearance)
+{
+       switch ((appearance & 0xffc0) >> 6) {
+       case 0x01:
+               return BLUETOOTH_TYPE_PHONE;
+       case 0x02:
+               return BLUETOOTH_TYPE_COMPUTER;
+       case 0x05:
+               return BLUETOOTH_TYPE_DISPLAY;
+       case 0x0a:
+               return BLUETOOTH_TYPE_OTHER_AUDIO;
+       case 0x0b:
+               return BLUETOOTH_TYPE_SCANNER;
+       case 0x0f: /* HID Generic */
+               switch (appearance & 0x3f) {
+               case 0x01:
+                       return BLUETOOTH_TYPE_KEYBOARD;
+               case 0x02:
+                       return BLUETOOTH_TYPE_MOUSE;
+               case 0x03:
+               case 0x04:
+                       return BLUETOOTH_TYPE_JOYPAD;
+               case 0x05:
+                       return BLUETOOTH_TYPE_TABLET;
+               case 0x08:
+                       return BLUETOOTH_TYPE_SCANNER;
+               }
+               break;
+       }
+
+       return 0;
+
+}
+
 static const char *
 uuid16_custom_to_string (guint uuid16, const char *uuid)
 {
diff --git a/lib/bluetooth-utils.h b/lib/bluetooth-utils.h
index f78b950..a5108dd 100644
--- a/lib/bluetooth-utils.h
+++ b/lib/bluetooth-utils.h
@@ -61,6 +61,7 @@ G_BEGIN_DECLS
 #define BLUETOOTH_UUID_VDP_SOURCE      0x1303
 
 BluetoothType  bluetooth_class_to_type         (guint32 class);
+BluetoothType  bluetooth_appearance_to_type    (guint16 appearance);
 const gchar   *bluetooth_type_to_string        (guint type);
 const gchar   *bluetooth_type_to_filter_string (guint type);
 gboolean       bluetooth_verify_address        (const char *bdaddr);
diff --git a/lib/gnome-bluetooth.symbols b/lib/gnome-bluetooth.symbols
index 21f99e2..9866ce1 100644
--- a/lib/gnome-bluetooth.symbols
+++ b/lib/gnome-bluetooth.symbols
@@ -29,6 +29,7 @@ bluetooth_client_connect_service
 bluetooth_client_connect_service_finish
 bluetooth_client_set_trusted
 bluetooth_client_get_device
+bluetooth_appearance_to_type
 bluetooth_class_to_type
 bluetooth_type_to_string
 bluetooth_type_to_filter_string