xref: /freebsd/lib/libusb/libusb10_desc.c (revision 37d0636aac290cc86ec7149a55167f6c21ad480f)

/* $FreeBSD$ */
/*-
 * Copyright (c) 2009 Sylvestre Gallon. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifdef LIBUSB_GLOBAL_INCLUDE_FILE
#include LIBUSB_GLOBAL_INCLUDE_FILE
#else
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/queue.h>
#endif

#define	libusb_device_handle libusb20_device

#include "libusb20.h"
#include "libusb20_desc.h"
#include "libusb20_int.h"
#include "libusb.h"
#include "libusb10.h"

#define	N_ALIGN(n) (-((-(n)) & (-8UL)))

/* USB descriptors */

int
libusb_get_device_descriptor(libusb_device *dev,
    struct libusb_device_descriptor *desc)
{
	struct LIBUSB20_DEVICE_DESC_DECODED *pdesc;
	struct libusb20_device *pdev;

	if ((dev == NULL) || (desc == NULL))
		return (LIBUSB_ERROR_INVALID_PARAM);

	pdev = dev->os_priv;
	pdesc = libusb20_dev_get_device_desc(pdev);

	desc->bLength = pdesc->bLength;
	desc->bDescriptorType = pdesc->bDescriptorType;
	desc->bcdUSB = pdesc->bcdUSB;
	desc->bDeviceClass = pdesc->bDeviceClass;
	desc->bDeviceSubClass = pdesc->bDeviceSubClass;
	desc->bDeviceProtocol = pdesc->bDeviceProtocol;
	desc->bMaxPacketSize0 = pdesc->bMaxPacketSize0;
	desc->idVendor = pdesc->idVendor;
	desc->idProduct = pdesc->idProduct;
	desc->bcdDevice = pdesc->bcdDevice;
	desc->iManufacturer = pdesc->iManufacturer;
	desc->iProduct = pdesc->iProduct;
	desc->iSerialNumber = pdesc->iSerialNumber;
	desc->bNumConfigurations = pdesc->bNumConfigurations;

	return (0);
}

int
libusb_get_active_config_descriptor(libusb_device *dev,
    struct libusb_config_descriptor **config)
{
	struct libusb20_device *pdev;
	uint8_t config_index;

	pdev = dev->os_priv;
	config_index = libusb20_dev_get_config_index(pdev);

	return (libusb_get_config_descriptor(dev, config_index, config));
}

int
libusb_get_config_descriptor(libusb_device *dev, uint8_t config_index,
    struct libusb_config_descriptor **config)
{
	struct libusb20_device *pdev;
	struct libusb20_config *pconf;
	struct libusb20_interface *pinf;
	struct libusb20_endpoint *pend;
	struct libusb_config_descriptor *pconfd;
	struct libusb_interface_descriptor *ifd;
	struct libusb_endpoint_descriptor *endd;
	uint8_t *pextra;
	uint16_t nextra;
	uint8_t nif;
	uint8_t nep;
	uint8_t nalt;
	uint8_t i;
	uint8_t j;
	uint8_t k;

	if (dev == NULL || config == NULL)
		return (LIBUSB_ERROR_INVALID_PARAM);

	*config = NULL;

	pdev = dev->os_priv;
	pconf = libusb20_dev_alloc_config(pdev, config_index);

	if (pconf == NULL)
		return (LIBUSB_ERROR_NOT_FOUND);

	nalt = nif = pconf->num_interface;
	nep = 0;
	nextra = N_ALIGN(pconf->extra.len);

	for (i = 0; i < nif; i++) {

		pinf = pconf->interface + i;
		nextra += N_ALIGN(pinf->extra.len);
		nep += pinf->num_endpoints;
		k = pinf->num_endpoints;
		pend = pinf->endpoints;
		while (k--) {
			nextra += N_ALIGN(pend->extra.len);
			pend++;
		}

		j = pinf->num_altsetting;
		nalt += pinf->num_altsetting;
		pinf = pinf->altsetting;
		while (j--) {
			nextra += N_ALIGN(pinf->extra.len);
			nep += pinf->num_endpoints;
			k = pinf->num_endpoints;
			pend = pinf->endpoints;
			while (k--) {
				nextra += N_ALIGN(pend->extra.len);
				pend++;
			}
			pinf++;
		}
	}

	nextra = nextra +
	    (1 * sizeof(libusb_config_descriptor)) +
	    (nif * sizeof(libusb_interface)) +
	    (nalt * sizeof(libusb_interface_descriptor)) +
	    (nep * sizeof(libusb_endpoint_descriptor));

	nextra = N_ALIGN(nextra);

	pconfd = malloc(nextra);

	if (pconfd == NULL) {
		free(pconf);
		return (LIBUSB_ERROR_NO_MEM);
	}
	/* make sure memory is initialised */
	memset(pconfd, 0, nextra);

	pconfd->interface = (libusb_interface *) (pconfd + 1);

	ifd = (libusb_interface_descriptor *) (pconfd->interface + nif);
	endd = (libusb_endpoint_descriptor *) (ifd + nalt);
	pextra = (uint8_t *)(endd + nep);

	/* fill in config descriptor */

	pconfd->bLength = pconf->desc.bLength;
	pconfd->bDescriptorType = pconf->desc.bDescriptorType;
	pconfd->wTotalLength = pconf->desc.wTotalLength;
	pconfd->bNumInterfaces = pconf->desc.bNumInterfaces;
	pconfd->bConfigurationValue = pconf->desc.bConfigurationValue;
	pconfd->iConfiguration = pconf->desc.iConfiguration;
	pconfd->bmAttributes = pconf->desc.bmAttributes;
	pconfd->MaxPower = pconf->desc.bMaxPower;

	if (pconf->extra.len != 0) {
		pconfd->extra_length = pconf->extra.len;
		pconfd->extra = pextra;
		memcpy(pextra, pconf->extra.ptr, pconfd->extra_length);
		pextra += N_ALIGN(pconfd->extra_length);
	}
	/* setup all interface and endpoint pointers */

	for (i = 0; i < nif; i++) {

		pconfd->interface[i].altsetting = ifd;
		ifd->endpoint = endd;
		endd += pconf->interface[i].num_endpoints;
		ifd++;

		for (j = 0; j < pconf->interface[i].num_altsetting; j++) {
			ifd->endpoint = endd;
			endd += pconf->interface[i].altsetting[j].num_endpoints;
			ifd++;
		}
	}

	/* fill in all interface and endpoint data */

	for (i = 0; i < nif; i++) {
		pinf = &pconf->interface[i];
		pconfd->interface[i].num_altsetting = pinf->num_altsetting + 1;
		for (j = 0; j < pconfd->interface[i].num_altsetting; j++) {
			if (j != 0)
				pinf = &pconf->interface[i].altsetting[j - 1];
			ifd = &pconfd->interface[i].altsetting[j];
			ifd->bLength = pinf->desc.bLength;
			ifd->bDescriptorType = pinf->desc.bDescriptorType;
			ifd->bInterfaceNumber = pinf->desc.bInterfaceNumber;
			ifd->bAlternateSetting = pinf->desc.bAlternateSetting;
			ifd->bNumEndpoints = pinf->desc.bNumEndpoints;
			ifd->bInterfaceClass = pinf->desc.bInterfaceClass;
			ifd->bInterfaceSubClass = pinf->desc.bInterfaceSubClass;
			ifd->bInterfaceProtocol = pinf->desc.bInterfaceProtocol;
			ifd->iInterface = pinf->desc.iInterface;
			if (pinf->extra.len != 0) {
				ifd->extra_length = pinf->extra.len;
				ifd->extra = pextra;
				memcpy(pextra, pinf->extra.ptr, pinf->extra.len);
				pextra += N_ALIGN(pinf->extra.len);
			}
			for (k = 0; k < pinf->num_endpoints; k++) {
				pend = &pinf->endpoints[k];
				endd = &ifd->endpoint[k];
				endd->bLength = pend->desc.bLength;
				endd->bDescriptorType = pend->desc.bDescriptorType;
				endd->bEndpointAddress = pend->desc.bEndpointAddress;
				endd->bmAttributes = pend->desc.bmAttributes;
				endd->wMaxPacketSize = pend->desc.wMaxPacketSize;
				endd->bInterval = pend->desc.bInterval;
				endd->bRefresh = pend->desc.bRefresh;
				endd->bSynchAddress = pend->desc.bSynchAddress;
				if (pend->extra.len != 0) {
					endd->extra_length = pend->extra.len;
					endd->extra = pextra;
					memcpy(pextra, pend->extra.ptr, pend->extra.len);
					pextra += N_ALIGN(pend->extra.len);
				}
			}
		}
	}

	free(pconf);

	*config = pconfd;

	return (0);			/* success */
}

int
libusb_get_config_descriptor_by_value(libusb_device *dev,
    uint8_t bConfigurationValue, struct libusb_config_descriptor **config)
{
	struct LIBUSB20_DEVICE_DESC_DECODED *pdesc;
	struct libusb20_device *pdev;
	int i;
	int err;

	if (dev == NULL || config == NULL)
		return (LIBUSB_ERROR_INVALID_PARAM);

	pdev = dev->os_priv;
	pdesc = libusb20_dev_get_device_desc(pdev);

	for (i = 0; i < pdesc->bNumConfigurations; i++) {
		err = libusb_get_config_descriptor(dev, i, config);
		if (err)
			return (err);

		if ((*config)->bConfigurationValue == bConfigurationValue)
			return (0);	/* success */

		libusb_free_config_descriptor(*config);
	}

	*config = NULL;

	return (LIBUSB_ERROR_NOT_FOUND);
}

void
libusb_free_config_descriptor(struct libusb_config_descriptor *config)
{
	free(config);
}

int
libusb_get_string_descriptor(libusb_device_handle *pdev,
    uint8_t desc_index, uint16_t langid, unsigned char *data,
    int length)
{
	if (pdev == NULL || data == NULL || length < 1)
		return (LIBUSB_ERROR_INVALID_PARAM);

	if (length > 65535)
		length = 65535;

	/* put some default data into the destination buffer */
	data[0] = 0;

	return (libusb_control_transfer(pdev, LIBUSB_ENDPOINT_IN,
	    LIBUSB_REQUEST_GET_DESCRIPTOR, (LIBUSB_DT_STRING << 8) | desc_index,
	    langid, data, length, 1000));
}

int
libusb_get_string_descriptor_ascii(libusb_device_handle *pdev,
    uint8_t desc_index, unsigned char *data, int length)
{
	if (pdev == NULL || data == NULL || length < 1)
		return (LIBUSB_ERROR_INVALID_PARAM);

	if (length > 65535)
		length = 65535;

	/* put some default data into the destination buffer */
	data[0] = 0;

	if (libusb20_dev_req_string_simple_sync(pdev, desc_index,
	    data, length) == 0)
		return (strlen((char *)data));

	return (LIBUSB_ERROR_OTHER);
}

int
libusb_get_descriptor(libusb_device_handle * devh, uint8_t desc_type,
    uint8_t desc_index, uint8_t *data, int length)
{
	if (devh == NULL || data == NULL || length < 1)
		return (LIBUSB_ERROR_INVALID_PARAM);

	if (length > 65535)
		length = 65535;

	return (libusb_control_transfer(devh, LIBUSB_ENDPOINT_IN,
	    LIBUSB_REQUEST_GET_DESCRIPTOR, (desc_type << 8) | desc_index, 0, data,
	    length, 1000));
}

int
libusb_parse_ss_endpoint_comp(const void *buf, int len,
    struct libusb_ss_endpoint_companion_descriptor **ep_comp)
{
	if (buf == NULL || ep_comp == NULL || len < 1)
		return (LIBUSB_ERROR_INVALID_PARAM);

	if (len > 65535)
		len = 65535;

	*ep_comp = NULL;

	while (len != 0) {
		uint8_t dlen;
		uint8_t dtype;

		dlen = ((const uint8_t *)buf)[0];
		dtype = ((const uint8_t *)buf)[1];

		if (dlen < 2 || dlen > len)
			break;

		if (dlen >= LIBUSB_DT_SS_ENDPOINT_COMPANION_SIZE &&
		    dtype == LIBUSB_DT_SS_ENDPOINT_COMPANION) {
			struct libusb_ss_endpoint_companion_descriptor *ptr;

			ptr = malloc(sizeof(*ptr));
			if (ptr == NULL)
				return (LIBUSB_ERROR_NO_MEM);

			ptr->bLength = LIBUSB_DT_SS_ENDPOINT_COMPANION_SIZE;
			ptr->bDescriptorType = dtype;
			ptr->bMaxBurst = ((const uint8_t *)buf)[2];
			ptr->bmAttributes = ((const uint8_t *)buf)[3];
			ptr->wBytesPerInterval = ((const uint8_t *)buf)[4] |
			    (((const uint8_t *)buf)[5] << 8);

			*ep_comp = ptr;

			return (0);	/* success */
		}

		buf = ((const uint8_t *)buf) + dlen;
		len -= dlen;
	}
	return (LIBUSB_ERROR_IO);
}

void
libusb_free_ss_endpoint_comp(struct libusb_ss_endpoint_companion_descriptor *ep_comp)
{
	if (ep_comp == NULL)
		return;

	free(ep_comp);
}

int
libusb_get_ss_endpoint_companion_descriptor(struct libusb_context *ctx,
    const struct libusb_endpoint_descriptor *endpoint,
    struct libusb_ss_endpoint_companion_descriptor **ep_comp)
{
	if (endpoint == NULL)
		return (LIBUSB_ERROR_INVALID_PARAM);
	return (libusb_parse_ss_endpoint_comp(endpoint->extra, endpoint->extra_length, ep_comp));
}

void
libusb_free_ss_endpoint_companion_descriptor(struct libusb_ss_endpoint_companion_descriptor *ep_comp)
{

	libusb_free_ss_endpoint_comp(ep_comp);
}

int
libusb_parse_bos_descriptor(const void *buf, int len,
    struct libusb_bos_descriptor **bos)
{
	struct libusb_bos_descriptor *ptr;
	struct libusb_usb_2_0_device_capability_descriptor *dcap_20 = NULL;
	struct libusb_ss_usb_device_capability_descriptor *ss_cap = NULL;

	if (buf == NULL || bos == NULL || len < 1)
		return (LIBUSB_ERROR_INVALID_PARAM);

	if (len > 65535)
		len = 65535;

	*bos = ptr = NULL;

	while (len != 0) {
		uint8_t dlen;
		uint8_t dtype;

		dlen = ((const uint8_t *)buf)[0];
		dtype = ((const uint8_t *)buf)[1];

		if (dlen < 2 || dlen > len)
			break;

		if (dlen >= LIBUSB_DT_BOS_SIZE &&
		    dtype == LIBUSB_DT_BOS) {

			ptr = malloc(sizeof(*ptr) + sizeof(*dcap_20) +
			    sizeof(*ss_cap));

			if (ptr == NULL)
				return (LIBUSB_ERROR_NO_MEM);

			*bos = ptr;

			ptr->bLength = LIBUSB_DT_BOS_SIZE;
			ptr->bDescriptorType = dtype;
			ptr->wTotalLength = ((const uint8_t *)buf)[2] |
			    (((const uint8_t *)buf)[3] << 8);
			ptr->bNumDeviceCapabilities = ((const uint8_t *)buf)[4];
			ptr->usb_2_0_ext_cap = NULL;
			ptr->ss_usb_cap = NULL;

			dcap_20 = (void *)(ptr + 1);
			ss_cap = (void *)(dcap_20 + 1);
		}
		if (dlen >= 3 &&
		    ptr != NULL &&
		    dtype == LIBUSB_DT_DEVICE_CAPABILITY) {
			switch (((const uint8_t *)buf)[2]) {
			case LIBUSB_USB_2_0_EXTENSION_DEVICE_CAPABILITY:
				if (ptr->usb_2_0_ext_cap != NULL || dcap_20 == NULL)
					break;
				if (dlen < LIBUSB_USB_2_0_EXTENSION_DEVICE_CAPABILITY_SIZE)
					break;

				ptr->usb_2_0_ext_cap = dcap_20;

				dcap_20->bLength = LIBUSB_USB_2_0_EXTENSION_DEVICE_CAPABILITY_SIZE;
				dcap_20->bDescriptorType = dtype;
				dcap_20->bDevCapabilityType = ((const uint8_t *)buf)[2];
				dcap_20->bmAttributes = ((const uint8_t *)buf)[3] |
				    (((const uint8_t *)buf)[4] << 8) |
				    (((const uint8_t *)buf)[5] << 16) |
				    (((const uint8_t *)buf)[6] << 24);
				break;

			case LIBUSB_SS_USB_DEVICE_CAPABILITY:
				if (ptr->ss_usb_cap != NULL || ss_cap == NULL)
					break;
				if (dlen < LIBUSB_SS_USB_DEVICE_CAPABILITY_SIZE)
					break;

				ptr->ss_usb_cap = ss_cap;

				ss_cap->bLength = LIBUSB_SS_USB_DEVICE_CAPABILITY_SIZE;
				ss_cap->bDescriptorType = dtype;
				ss_cap->bDevCapabilityType = ((const uint8_t *)buf)[2];
				ss_cap->bmAttributes = ((const uint8_t *)buf)[3];
				ss_cap->wSpeedSupported = ((const uint8_t *)buf)[4] |
				    (((const uint8_t *)buf)[5] << 8);
				ss_cap->bFunctionalitySupport = ((const uint8_t *)buf)[6];
				ss_cap->bU1DevExitLat = ((const uint8_t *)buf)[7];
				ss_cap->wU2DevExitLat = ((const uint8_t *)buf)[8] |
				    (((const uint8_t *)buf)[9] << 8);
				break;

			default:
				break;
			}
		}

		buf = ((const uint8_t *)buf) + dlen;
		len -= dlen;
	}
	if (ptr != NULL)
		return (0);		/* success */

	return (LIBUSB_ERROR_IO);
}

void
libusb_free_bos_descriptor(struct libusb_bos_descriptor *bos)
{
	if (bos == NULL)
		return;

	free(bos);
}

int
libusb_get_bos_descriptor(libusb_device_handle *handle,
    struct libusb_bos_descriptor **bos)
{
	uint8_t bos_header[LIBUSB_DT_BOS_SIZE] = {0};
	uint16_t wTotalLength;
	uint8_t *bos_data;
	int err;

	err = libusb_get_descriptor(handle, LIBUSB_DT_BOS, 0,
	    bos_header, sizeof(bos_header));
	if (err < 0)
		return (err);

	wTotalLength = bos_header[2] | (bos_header[3] << 8);
	if (wTotalLength < LIBUSB_DT_BOS_SIZE)
		return (LIBUSB_ERROR_INVALID_PARAM);

	bos_data = calloc(wTotalLength, 1);
	if (bos_data == NULL)
		return (LIBUSB_ERROR_NO_MEM);

	err = libusb_get_descriptor(handle, LIBUSB_DT_BOS, 0,
	    bos_data, wTotalLength);
	if (err < 0)
		goto done;

	/* avoid descriptor length mismatches */
	bos_data[2] = (wTotalLength & 0xFF);
	bos_data[3] = (wTotalLength >> 8);

	err = libusb_parse_bos_descriptor(bos_data, wTotalLength, bos);
done:
	free(bos_data);
	return (err);
}

int
libusb_get_usb_2_0_extension_descriptor(struct libusb_context *ctx,
    struct libusb_bos_dev_capability_descriptor *dev_cap,
    struct libusb_usb_2_0_extension_descriptor **usb_2_0_extension)
{
	struct libusb_usb_2_0_extension_descriptor *desc;

	if (dev_cap == NULL || usb_2_0_extension == NULL ||
	    dev_cap->bDevCapabilityType != LIBUSB_BT_USB_2_0_EXTENSION)
		return (LIBUSB_ERROR_INVALID_PARAM);
	if (dev_cap->bLength < LIBUSB_BT_USB_2_0_EXTENSION_SIZE)
		return (LIBUSB_ERROR_IO);

	desc = malloc(sizeof(*desc));
	if (desc == NULL)
		return (LIBUSB_ERROR_NO_MEM);

	desc->bLength = LIBUSB_BT_USB_2_0_EXTENSION_SIZE;
	desc->bDescriptorType = dev_cap->bDescriptorType;
	desc->bDevCapabilityType = dev_cap->bDevCapabilityType;
	desc->bmAttributes =
	    (dev_cap->dev_capability_data[0]) |
	    (dev_cap->dev_capability_data[1] << 8) |
	    (dev_cap->dev_capability_data[2] << 16) |
	    (dev_cap->dev_capability_data[3] << 24);

	*usb_2_0_extension = desc;
	return (0);
}

void
libusb_free_usb_2_0_extension_descriptor(
    struct libusb_usb_2_0_extension_descriptor *usb_2_0_extension)
{

	free(usb_2_0_extension);
}

int
libusb_get_ss_usb_device_capability_descriptor(struct libusb_context *ctx,
    struct libusb_bos_dev_capability_descriptor *dev_cap,
    struct libusb_ss_usb_device_capability_descriptor **ss_usb_device_capability)
{
	struct libusb_ss_usb_device_capability_descriptor *desc;

	if (dev_cap == NULL || ss_usb_device_capability == NULL ||
	    dev_cap->bDevCapabilityType != LIBUSB_BT_SS_USB_DEVICE_CAPABILITY)
		return (LIBUSB_ERROR_INVALID_PARAM);
	if (dev_cap->bLength < LIBUSB_BT_SS_USB_DEVICE_CAPABILITY_SIZE)
		return (LIBUSB_ERROR_IO);

	desc = malloc(sizeof(*desc));
	if (desc == NULL)
		return (LIBUSB_ERROR_NO_MEM);

	desc->bLength = LIBUSB_BT_SS_USB_DEVICE_CAPABILITY_SIZE;
	desc->bDescriptorType = dev_cap->bDescriptorType;
	desc->bDevCapabilityType = dev_cap->bDevCapabilityType;
	desc->bmAttributes = dev_cap->dev_capability_data[0];
	desc->wSpeedSupported = dev_cap->dev_capability_data[1] |
	    (dev_cap->dev_capability_data[2] << 8);
	desc->bFunctionalitySupport = dev_cap->dev_capability_data[3];
	desc->bU1DevExitLat = dev_cap->dev_capability_data[4];
	desc->wU2DevExitLat = dev_cap->dev_capability_data[5] |
	    (dev_cap->dev_capability_data[6] << 8);

	*ss_usb_device_capability = desc;
	return (0);
}

void
libusb_free_ss_usb_device_capability_descriptor(
    struct libusb_ss_usb_device_capability_descriptor *ss_usb_device_capability)
{

	free(ss_usb_device_capability);
}

int
libusb_get_container_id_descriptor(struct libusb_context *ctx,
    struct libusb_bos_dev_capability_descriptor *dev_cap,
    struct libusb_container_id_descriptor **container_id)
{
	struct libusb_container_id_descriptor *desc;

	if (dev_cap == NULL || container_id == NULL ||
	    dev_cap->bDevCapabilityType != LIBUSB_BT_CONTAINER_ID)
		return (LIBUSB_ERROR_INVALID_PARAM);
	if (dev_cap->bLength < LIBUSB_BT_CONTAINER_ID_SIZE)
		return (LIBUSB_ERROR_IO);

	desc = malloc(sizeof(*desc));
	if (desc == NULL)
		return (LIBUSB_ERROR_NO_MEM);

	desc->bLength = LIBUSB_BT_CONTAINER_ID_SIZE;
	desc->bDescriptorType = dev_cap->bDescriptorType;
	desc->bDevCapabilityType = dev_cap->bDevCapabilityType;
	desc->bReserved = dev_cap->dev_capability_data[0];
	memcpy(desc->ContainerID, dev_cap->dev_capability_data + 1,
	    sizeof(desc->ContainerID));

	*container_id = desc;
	return (0);
}

void
libusb_free_container_id_descriptor(
    struct libusb_container_id_descriptor *container_id)
{

	free(container_id);
}