static void clear_endpoint(struct media_endpoint *endpoint)
{
media_endpoint_cancel_all(endpoint);
while (endpoint->transports != NULL)
clear_configuration(endpoint, endpoint->transports->data);
}
/** \ingroup desc
* Free a configuration descriptor obtained from
* libusb_get_active_config_descriptor() or libusb_get_config_descriptor().
* It is safe to call this function with a NULL config parameter, in which
* case the function simply returns.
*
* \param config the configuration descriptor to free
*/
void API_EXPORTED libusb_free_config_descriptor(
struct libusb_config_descriptor *config)
{
if (!config)
return;
clear_configuration(config);
free(config);
}
static int parse_configuration(struct libusb_context *ctx,
struct libusb_config_descriptor *config, unsigned char *buffer,
int host_endian)
{
int i;
int r;
int size;
int tmp;
struct usb_descriptor_header header;
struct libusb_interface *usb_interface;
usbi_parse_descriptor(buffer, "bbwbbbbb", config, host_endian);
size = config->wTotalLength;
if (config->bNumInterfaces > USB_MAXINTERFACES) {
usbi_err(ctx, "too many interfaces (%d)", config->bNumInterfaces);
return LIBUSB_ERROR_IO;
}
tmp = config->bNumInterfaces * sizeof(struct libusb_interface);
usb_interface = malloc(tmp);
config->interface = usb_interface;
if (!config->interface)
return LIBUSB_ERROR_NO_MEM;
memset(usb_interface, 0, tmp);
buffer += config->bLength;
size -= config->bLength;
config->extra = NULL;
config->extra_length = 0;
for (i = 0; i < config->bNumInterfaces; i++) {
int len;
unsigned char *begin;
/* Skip over the rest of the Class Specific or Vendor */
/* Specific descriptors */
begin = buffer;
while (size >= DESC_HEADER_LENGTH) {
usbi_parse_descriptor(buffer, "bb", &header, 0);
if ((header.bLength > size) ||
(header.bLength < DESC_HEADER_LENGTH)) {
usbi_err(ctx, "invalid descriptor length of %d",
header.bLength);
r = LIBUSB_ERROR_IO;
goto err;
}
/* If we find another "proper" descriptor then we're done */
if ((header.bDescriptorType == LIBUSB_DT_ENDPOINT) ||
(header.bDescriptorType == LIBUSB_DT_INTERFACE) ||
(header.bDescriptorType == LIBUSB_DT_CONFIG) ||
(header.bDescriptorType == LIBUSB_DT_DEVICE))
break;
usbi_dbg("skipping descriptor 0x%x\n", header.bDescriptorType);
buffer += header.bLength;
size -= header.bLength;
}
/* Copy any unknown descriptors into a storage area for */
/* drivers to later parse */
len = (int)(buffer - begin);
if (len) {
/* FIXME: We should realloc and append here */
if (!config->extra_length) {
config->extra = malloc(len);
if (!config->extra) {
r = LIBUSB_ERROR_NO_MEM;
goto err;
}
memcpy((unsigned char *) config->extra, begin, len);
config->extra_length = len;
}
}
r = parse_interface(ctx, usb_interface + i, buffer, size, host_endian);
if (r < 0)
goto err;
buffer += r;
size -= r;
}
return size;
err:
clear_configuration(config);
return r;
}
