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/* -*- 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"
#include "gusb-json-common.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)
{
}
gboolean
_g_usb_bos_descriptor_load(GUsbBosDescriptor *self, JsonObject *json_object, GError **error)
{
const gchar *str;
g_return_val_if_fail(G_USB_IS_BOS_DESCRIPTOR(self), FALSE);
g_return_val_if_fail(json_object != NULL, FALSE);
g_return_val_if_fail(error == NULL || *error == NULL, -1);
/* optional properties */
self->bos_cap.bDevCapabilityType =
json_object_get_int_member_with_default(json_object, "DevCapabilityType", 0x0);
/* extra data */
str = json_object_get_string_member_with_default(json_object, "ExtraData", NULL);
if (str != NULL) {
gsize bufsz = 0;
g_autofree guchar *buf = g_base64_decode(str, &bufsz);
if (self->extra != NULL)
g_bytes_unref(self->extra);
self->extra = g_bytes_new_take(g_steal_pointer(&buf), bufsz);
}
/* success */
return TRUE;
}
gboolean
_g_usb_bos_descriptor_save(GUsbBosDescriptor *self, JsonBuilder *json_builder, GError **error)
{
g_return_val_if_fail(G_USB_IS_BOS_DESCRIPTOR(self), FALSE);
g_return_val_if_fail(json_builder != NULL, FALSE);
g_return_val_if_fail(error == NULL || *error == NULL, FALSE);
/* start */
json_builder_begin_object(json_builder);
/* optional properties */
if (self->bos_cap.bDevCapabilityType != 0) {
json_builder_set_member_name(json_builder, "DevCapabilityType");
json_builder_add_int_value(json_builder, self->bos_cap.bDevCapabilityType);
}
/* extra data */
if (self->extra != NULL && g_bytes_get_size(self->extra) > 0) {
g_autofree gchar *str = g_base64_encode(g_bytes_get_data(self->extra, NULL),
g_bytes_get_size(self->extra));
json_builder_set_member_name(json_builder, "ExtraData");
json_builder_add_string_value(json_builder, str);
}
/* success */
json_builder_end_object(json_builder);
return TRUE;
}
/**
* _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;
}
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