1 files changed, 109 insertions, 0 deletions
diff --git a/gusb/gusb-bos-descriptor.c b/gusb/gusb-bos-descriptor.c
new file mode 100644
index 0000000..b0664f8
--- /dev/null
+++ b/gusb/gusb-bos-descriptor.c
@@ -0,0 +1,109 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2022 Richard Hughes <richard@hughsie.com>
+ *
+ * SPDX-License-Identifier: LGPL-2.1+
+ */
+
+/**
+ * SECTION:gusb-bos-descriptor
+ * @short_description: GLib wrapper around a USB BOS descriptor.
+ *
+ * This object is a thin glib wrapper around a `libusb_bos_dev_capability_descriptor`.
+ *
+ * All the data is copied when the object is created and the original descriptor can be destroyed
+ * at any point.
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include "gusb-bos-descriptor-private.h"
+
+struct _GUsbBosDescriptor
+{
+	GObject parent_instance;
+
+	struct libusb_bos_dev_capability_descriptor bos_cap;
+	GBytes *extra;
+};
+
+G_DEFINE_TYPE (GUsbBosDescriptor, g_usb_bos_descriptor, G_TYPE_OBJECT)
+
+static void
+g_usb_bos_descriptor_finalize (GObject *object)
+{
+	GUsbBosDescriptor *self = G_USB_BOS_DESCRIPTOR (object);
+
+	g_bytes_unref (self->extra);
+
+	G_OBJECT_CLASS (g_usb_bos_descriptor_parent_class)->finalize (object);
+}
+
+static void
+g_usb_bos_descriptor_class_init (GUsbBosDescriptorClass *klass)
+{
+	GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+	object_class->finalize = g_usb_bos_descriptor_finalize;
+}
+
+static void
+g_usb_bos_descriptor_init (GUsbBosDescriptor *self)
+{
+}
+
+/**
+ * _g_usb_bos_descriptor_new:
+ *
+ * Return value: a new #GUsbBosDescriptor object.
+ *
+ * Since: 0.4.0
+ **/
+GUsbBosDescriptor *
+_g_usb_bos_descriptor_new (const struct libusb_bos_dev_capability_descriptor *bos_cap)
+{
+	GUsbBosDescriptor *self;
+	self = g_object_new (G_USB_TYPE_BOS_DESCRIPTOR, NULL);
+
+	/* copy the data */
+	memcpy (&self->bos_cap, bos_cap, sizeof (*bos_cap));
+	self->extra = g_bytes_new (bos_cap->dev_capability_data, bos_cap->bLength - 0x03);
+
+	return G_USB_BOS_DESCRIPTOR (self);
+}
+
+/**
+ * g_usb_bos_descriptor_get_capability:
+ * @self: a #GUsbBosDescriptor
+ *
+ * Gets the BOS descriptor capability.
+ *
+ * Return value: capability
+ *
+ * Since: 0.4.0
+ **/
+guint8
+g_usb_bos_descriptor_get_capability (GUsbBosDescriptor *self)
+{
+	g_return_val_if_fail (G_USB_IS_BOS_DESCRIPTOR (self), 0);
+	return self->bos_cap.bDevCapabilityType;
+}
+
+/**
+ * g_usb_bos_descriptor_get_extra:
+ * @self: a #GUsbBosDescriptor
+ *
+ * Gets any extra data from the BOS descriptor.
+ *
+ * Return value: (transfer none): a #GBytes, or %NULL for failure
+ *
+ * Since: 0.4.0
+ **/
+GBytes *
+g_usb_bos_descriptor_get_extra (GUsbBosDescriptor *self)
+{
+	g_return_val_if_fail (G_USB_IS_BOS_DESCRIPTOR (self), NULL);
+	return self->extra;
+}