/** \ingroup desc
* Get the USB configuration descriptor for the currently active configuration.
* This is a non-blocking function which does not involve any requests being
* sent to the device.
*
* \param dev a device
* \param config output location for the USB configuration descriptor. Only
* valid if 0 was returned. Must be freed with libusb_free_config_descriptor()
* after use.
* \returns 0 on success
* \returns LIBUSB_ERROR_NOT_FOUND if the device is in unconfigured state
* \returns another LIBUSB_ERROR code on error
* \see libusb_get_config_descriptor
*/
int API_EXPORTED libusb_get_active_config_descriptor(libusb_device *dev,
struct libusb_config_descriptor **config)
{
struct libusb_config_descriptor _config;
unsigned char tmp[LIBUSB_DT_CONFIG_SIZE];
unsigned char *buf = NULL;
int host_endian = 0;
int r;
r = usbi_backend->get_active_config_descriptor(dev, tmp,
LIBUSB_DT_CONFIG_SIZE, &host_endian);
if (r < 0)
return r;
if (r < LIBUSB_DT_CONFIG_SIZE) {
usbi_err(dev->ctx, "short config descriptor read %d/%d",
r, LIBUSB_DT_CONFIG_SIZE);
return LIBUSB_ERROR_IO;
}
usbi_parse_descriptor(tmp, "bbw", &_config, host_endian);
buf = malloc(_config.wTotalLength);
if (!buf)
return LIBUSB_ERROR_NO_MEM;
r = usbi_backend->get_active_config_descriptor(dev, buf,
_config.wTotalLength, &host_endian);
if (r >= 0)
r = raw_desc_to_config(dev->ctx, buf, r, host_endian, config);
free(buf);
return r;
}
/** \ingroup desc
* Get an USB 2.0 Extension descriptor
*
* \param ctx the context to operate on, or NULL for the default context
* \param dev_cap Device Capability descriptor with a bDevCapabilityType of
* \ref libusb_capability_type::LIBUSB_BT_USB_2_0_EXTENSION
* LIBUSB_BT_USB_2_0_EXTENSION
* \param usb_2_0_extension output location for the USB 2.0 Extension
* descriptor. Only valid if 0 was returned. Must be freed with
* libusb_free_usb_2_0_extension_descriptor() after use.
* \returns 0 on success
* \returns a LIBUSB_ERROR code on error
*/
int API_EXPORTED 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 *_usb_2_0_extension;
const int host_endian = 0;
if (dev_cap->bDevCapabilityType != LIBUSB_BT_USB_2_0_EXTENSION) {
usbi_err(ctx, "unexpected bDevCapabilityType %x (expected %x)",
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) {
usbi_err(ctx, "short dev-cap descriptor read %d/%d",
dev_cap->bLength, LIBUSB_BT_USB_2_0_EXTENSION_SIZE);
return LIBUSB_ERROR_IO;
}
_usb_2_0_extension = malloc(sizeof(*_usb_2_0_extension));
if (!_usb_2_0_extension)
return LIBUSB_ERROR_NO_MEM;
usbi_parse_descriptor((unsigned char *)dev_cap, "bbbd",
_usb_2_0_extension, host_endian);
*usb_2_0_extension = _usb_2_0_extension;
return LIBUSB_SUCCESS;
}
/** \ingroup desc
* Get a Container ID descriptor
*
* \param ctx the context to operate on, or NULL for the default context
* \param dev_cap Device Capability descriptor with a bDevCapabilityType of
* \ref libusb_capability_type::LIBUSB_BT_CONTAINER_ID
* LIBUSB_BT_CONTAINER_ID
* \param container_id output location for the Container ID descriptor.
* Only valid if 0 was returned. Must be freed with
* libusb_free_container_id_descriptor() after use.
* \returns 0 on success
* \returns a LIBUSB_ERROR code on error
*/
int API_EXPORTED 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 *_container_id;
const int host_endian = 0;
if (dev_cap->bDevCapabilityType != LIBUSB_BT_CONTAINER_ID) {
usbi_err(ctx, "unexpected bDevCapabilityType %x (expected %x)",
dev_cap->bDevCapabilityType,
LIBUSB_BT_CONTAINER_ID);
return LIBUSB_ERROR_INVALID_PARAM;
}
if (dev_cap->bLength < LIBUSB_BT_CONTAINER_ID_SIZE) {
usbi_err(ctx, "short dev-cap descriptor read %d/%d",
dev_cap->bLength, LIBUSB_BT_CONTAINER_ID_SIZE);
return LIBUSB_ERROR_IO;
}
_container_id = malloc(sizeof(*_container_id));
if (!_container_id)
return LIBUSB_ERROR_NO_MEM;
usbi_parse_descriptor((unsigned char *)dev_cap, "bbbbu",
_container_id, host_endian);
*container_id = _container_id;
return LIBUSB_SUCCESS;
}
/** \ingroup desc
* Get a SuperSpeed USB Device Capability descriptor
*
* \param ctx the context to operate on, or NULL for the default context
* \param dev_cap Device Capability descriptor with a bDevCapabilityType of
* \ref libusb_capability_type::LIBUSB_BT_SS_USB_DEVICE_CAPABILITY
* LIBUSB_BT_SS_USB_DEVICE_CAPABILITY
* \param ss_usb_device_cap output location for the SuperSpeed USB Device
* Capability descriptor. Only valid if 0 was returned. Must be freed with
* libusb_free_ss_usb_device_capability_descriptor() after use.
* \returns 0 on success
* \returns a LIBUSB_ERROR code on error
*/
int API_EXPORTED 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_cap)
{
struct libusb_ss_usb_device_capability_descriptor *_ss_usb_device_cap;
const int host_endian = 0;
if (dev_cap->bDevCapabilityType != LIBUSB_BT_SS_USB_DEVICE_CAPABILITY) {
usbi_err(ctx, "unexpected bDevCapabilityType %x (expected %x)",
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) {
usbi_err(ctx, "short dev-cap descriptor read %d/%d",
dev_cap->bLength, LIBUSB_BT_SS_USB_DEVICE_CAPABILITY_SIZE);
return LIBUSB_ERROR_IO;
}
_ss_usb_device_cap = malloc(sizeof(*_ss_usb_device_cap));
if (!_ss_usb_device_cap)
return LIBUSB_ERROR_NO_MEM;
usbi_parse_descriptor((unsigned char *)dev_cap, "bbbbwbbw",
_ss_usb_device_cap, host_endian);
*ss_usb_device_cap = _ss_usb_device_cap;
return LIBUSB_SUCCESS;
}
/** \ingroup desc
* Get a USB configuration descriptor based on its index.
* This is a non-blocking function which does not involve any requests being
* sent to the device.
*
* \param dev a device
* \param config_index the index of the configuration you wish to retrieve
* \param config output location for the USB configuration descriptor. Only
* valid if 0 was returned. Must be freed with libusb_free_config_descriptor()
* after use.
* \returns 0 on success
* \returns LIBUSB_ERROR_NOT_FOUND if the configuration does not exist
* \returns another LIBUSB_ERROR code on error
* \see libusb_get_active_config_descriptor()
* \see libusb_get_config_descriptor_by_value()
*/
int API_EXPORTED libusb_get_config_descriptor(libusb_device *dev,
uint8_t config_index, struct libusb_config_descriptor **config)
{
struct libusb_config_descriptor *_config;
unsigned char tmp[8];
unsigned char *buf = NULL;
int host_endian = 0;
int r;
usbi_dbg("index %d", config_index);
if (config_index >= dev->num_configurations)
return LIBUSB_ERROR_NOT_FOUND;
_config = malloc(sizeof(*_config));
if (!_config)
return LIBUSB_ERROR_NO_MEM;
r = usbi_backend->get_config_descriptor(dev, config_index, tmp,
sizeof(tmp), &host_endian);
if (r < 0)
goto err;
usbi_parse_descriptor(tmp, "bbw", _config, host_endian);
buf = malloc(_config->wTotalLength);
if (!buf) {
r = LIBUSB_ERROR_NO_MEM;
goto err;
}
host_endian = 0;
r = usbi_backend->get_config_descriptor(dev, config_index, buf,
_config->wTotalLength, &host_endian);
if (r < 0)
goto err;
r = parse_configuration(dev->ctx, _config, buf, host_endian);
if (r < 0) {
usbi_err(dev->ctx, "parse_configuration failed with error %d", r);
goto err;
} else if (r > 0) {
usbi_warn(dev->ctx, "descriptor data still left");
}
free(buf);
*config = _config;
return 0;
err:
free(_config);
if (buf)
free(buf);
return r;
}
/** \ingroup desc
* Get an endpoints superspeed endpoint companion descriptor (if any)
*
* \param ctx the context to operate on, or NULL for the default context
* \param endpoint endpoint descriptor from which to get the superspeed
* endpoint companion descriptor
* \param ep_comp output location for the superspeed endpoint companion
* descriptor. Only valid if 0 was returned. Must be freed with
* libusb_free_ss_endpoint_companion_descriptor() after use.
* \returns 0 on success
* \returns LIBUSB_ERROR_NOT_FOUND if the configuration does not exist
* \returns another LIBUSB_ERROR code on error
*/
int API_EXPORTED libusb_get_ss_endpoint_companion_descriptor(
struct libusb_context *ctx,
const struct libusb_endpoint_descriptor *endpoint,
struct libusb_ss_endpoint_companion_descriptor **ep_comp)
{
struct usb_descriptor_header header;
int size = endpoint->extra_length;
const unsigned char *buffer = endpoint->extra;
*ep_comp = NULL;
while (size >= DESC_HEADER_LENGTH) {
usbi_parse_descriptor(buffer, "bb", &header, 0);
if (header.bLength < 2 || header.bLength > size) {
usbi_err(ctx, "invalid descriptor length %d",
header.bLength);
return LIBUSB_ERROR_IO;
}
if (header.bDescriptorType != LIBUSB_DT_SS_ENDPOINT_COMPANION) {
buffer += header.bLength;
size -= header.bLength;
continue;
}
if (header.bLength < LIBUSB_DT_SS_ENDPOINT_COMPANION_SIZE) {
usbi_err(ctx, "invalid ss-ep-comp-desc length %d",
header.bLength);
return LIBUSB_ERROR_IO;
}
*ep_comp = malloc(sizeof(**ep_comp));
if (*ep_comp == NULL)
return LIBUSB_ERROR_NO_MEM;
usbi_parse_descriptor(buffer, "bbbbw", *ep_comp, 0);
return LIBUSB_SUCCESS;
}
return LIBUSB_ERROR_NOT_FOUND;
}
/** \ingroup desc
* Get a Binary Object Store (BOS) descriptor
* This is a BLOCKING function, which will send requests to the device.
*
* \param handle the handle of an open libusb device
* \param bos output location for the BOS descriptor. Only valid if 0 was returned.
* Must be freed with \ref libusb_free_bos_descriptor() after use.
* \returns 0 on success
* \returns LIBUSB_ERROR_NOT_FOUND if the device doesn't have a BOS descriptor
* \returns another LIBUSB_ERROR code on error
*/
int API_EXPORTED libusb_get_bos_descriptor(libusb_device_handle *handle,
struct libusb_bos_descriptor **bos)
{
struct libusb_bos_descriptor _bos;
uint8_t bos_header[LIBUSB_DT_BOS_SIZE] = {0};
unsigned char *bos_data = NULL;
const int host_endian = 0;
int r;
/* Read the BOS. This generates 2 requests on the bus,
* one for the header, and one for the full BOS */
r = libusb_get_descriptor(handle, LIBUSB_DT_BOS, 0, bos_header,
LIBUSB_DT_BOS_SIZE);
if (r < 0) {
if (r != LIBUSB_ERROR_PIPE)
usbi_err(handle->dev->ctx, "failed to read BOS (%d)", r);
return r;
}
if (r < LIBUSB_DT_BOS_SIZE) {
usbi_err(handle->dev->ctx, "short BOS read %d/%d",
r, LIBUSB_DT_BOS_SIZE);
return LIBUSB_ERROR_IO;
}
usbi_parse_descriptor(bos_header, "bbwb", &_bos, host_endian);
usbi_dbg("found BOS descriptor: size %d bytes, %d capabilities",
_bos.wTotalLength, _bos.bNumDeviceCaps);
bos_data = calloc(_bos.wTotalLength, 1);
if (bos_data == NULL)
return LIBUSB_ERROR_NO_MEM;
r = libusb_get_descriptor(handle, LIBUSB_DT_BOS, 0, bos_data,
_bos.wTotalLength);
if (r >= 0)
r = parse_bos(handle->dev->ctx, bos, bos_data, r, host_endian);
else
usbi_err(handle->dev->ctx, "failed to read BOS (%d)", r);
free(bos_data);
return r;
}
static int parse_endpoint(struct libusb_context *ctx,
struct libusb_endpoint_descriptor *endpoint, unsigned char *buffer,
int size, int host_endian)
{
struct usb_descriptor_header header;
unsigned char *extra;
unsigned char *begin;
int parsed = 0;
int len;
usbi_parse_descriptor(buffer, "bb", &header, 0);
/* Everything should be fine being passed into here, but we sanity */
/* check JIC */
if (header.bLength > size) {
usbi_err(ctx, "ran out of descriptors parsing");
return -1;
}
if (header.bDescriptorType != LIBUSB_DT_ENDPOINT) {
usbi_err(ctx, "unexpected descriptor %x (expected %x)",
header.bDescriptorType, LIBUSB_DT_ENDPOINT);
return parsed;
}
if (header.bLength >= ENDPOINT_AUDIO_DESC_LENGTH)
usbi_parse_descriptor(buffer, "bbbbwbbb", endpoint, host_endian);
else if (header.bLength >= ENDPOINT_DESC_LENGTH)
usbi_parse_descriptor(buffer, "bbbbwb", endpoint, host_endian);
buffer += header.bLength;
size -= header.bLength;
parsed += header.bLength;
/* 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 < 2) {
usbi_err(ctx, "invalid descriptor length %d", header.bLength);
return -1;
}
/* 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 %x", header.bDescriptorType);
buffer += header.bLength;
size -= header.bLength;
parsed += header.bLength;
}
/* Copy any unknown descriptors into a storage area for drivers */
/* to later parse */
len = (int)(buffer - begin);
if (!len) {
endpoint->extra = NULL;
endpoint->extra_length = 0;
return parsed;
}
extra = malloc(len);
endpoint->extra = extra;
if (!extra) {
endpoint->extra_length = 0;
return LIBUSB_ERROR_NO_MEM;
}
memcpy(extra, begin, len);
endpoint->extra_length = len;
return parsed;
}
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;
}
static int parse_interface(libusb_context *ctx,
struct libusb_interface *usb_interface, unsigned char *buffer, int size,
int host_endian)
{
int i;
int len;
int r;
int parsed = 0;
int tmp;
struct usb_descriptor_header header;
struct libusb_interface_descriptor *ifp;
unsigned char *begin;
usb_interface->num_altsetting = 0;
while (size >= INTERFACE_DESC_LENGTH) {
struct libusb_interface_descriptor *altsetting =
(struct libusb_interface_descriptor *) usb_interface->altsetting;
altsetting = realloc(altsetting,
sizeof(struct libusb_interface_descriptor) *
(usb_interface->num_altsetting + 1));
if (!altsetting) {
r = LIBUSB_ERROR_NO_MEM;
goto err;
}
usb_interface->altsetting = altsetting;
ifp = altsetting + usb_interface->num_altsetting;
usb_interface->num_altsetting++;
usbi_parse_descriptor(buffer, "bbbbbbbbb", ifp, 0);
ifp->extra = NULL;
ifp->extra_length = 0;
ifp->endpoint = NULL;
/* Skip over the interface */
buffer += ifp->bLength;
parsed += ifp->bLength;
size -= ifp->bLength;
begin = buffer;
/* Skip over any interface, class or vendor descriptors */
while (size >= DESC_HEADER_LENGTH) {
usbi_parse_descriptor(buffer, "bb", &header, 0);
if (header.bLength < 2) {
usbi_err(ctx, "invalid descriptor of length %d",
header.bLength);
r = LIBUSB_ERROR_IO;
goto err;
}
/* If we find another "proper" descriptor then we're done */
if ((header.bDescriptorType == LIBUSB_DT_INTERFACE) ||
(header.bDescriptorType == LIBUSB_DT_ENDPOINT) ||
(header.bDescriptorType == LIBUSB_DT_CONFIG) ||
(header.bDescriptorType == LIBUSB_DT_DEVICE))
break;
buffer += header.bLength;
parsed += header.bLength;
size -= header.bLength;
}
/* Copy any unknown descriptors into a storage area for */
/* drivers to later parse */
len = (int)(buffer - begin);
if (len) {
ifp->extra = malloc(len);
if (!ifp->extra) {
r = LIBUSB_ERROR_NO_MEM;
goto err;
}
memcpy((unsigned char *) ifp->extra, begin, len);
ifp->extra_length = len;
}
/* Did we hit an unexpected descriptor? */
usbi_parse_descriptor(buffer, "bb", &header, 0);
if ((size >= DESC_HEADER_LENGTH) &&
((header.bDescriptorType == LIBUSB_DT_CONFIG) ||
(header.bDescriptorType == LIBUSB_DT_DEVICE)))
return parsed;
if (ifp->bNumEndpoints > USB_MAXENDPOINTS) {
usbi_err(ctx, "too many endpoints (%d)", ifp->bNumEndpoints);
r = LIBUSB_ERROR_IO;
goto err;
}
if (ifp->bNumEndpoints > 0) {
struct libusb_endpoint_descriptor *endpoint;
tmp = ifp->bNumEndpoints * sizeof(struct libusb_endpoint_descriptor);
endpoint = malloc(tmp);
ifp->endpoint = endpoint;
if (!endpoint) {
r = LIBUSB_ERROR_NO_MEM;
goto err;
}
memset(endpoint, 0, tmp);
for (i = 0; i < ifp->bNumEndpoints; i++) {
usbi_parse_descriptor(buffer, "bb", &header, 0);
if (header.bLength > size) {
usbi_err(ctx, "ran out of descriptors parsing");
r = LIBUSB_ERROR_IO;
goto err;
}
r = parse_endpoint(ctx, endpoint + i, buffer, size,
host_endian);
if (r < 0)
goto err;
buffer += r;
parsed += r;
size -= r;
}
}
/* We check to see if it's an alternate to this one */
ifp = (struct libusb_interface_descriptor *) buffer;
if (size < LIBUSB_DT_INTERFACE_SIZE ||
ifp->bDescriptorType != LIBUSB_DT_INTERFACE ||
!ifp->bAlternateSetting)
return parsed;
}
return parsed;
err:
clear_interface(usb_interface);
return r;
}
static int parse_bos(struct libusb_context *ctx,
struct libusb_bos_descriptor **bos,
unsigned char *buffer, int size, int host_endian)
{
struct libusb_bos_descriptor bos_header, *_bos;
struct libusb_bos_dev_capability_descriptor dev_cap;
int i;
if (size < LIBUSB_DT_BOS_SIZE) {
usbi_err(ctx, "short bos descriptor read %d/%d",
size, LIBUSB_DT_BOS_SIZE);
return LIBUSB_ERROR_IO;
}
usbi_parse_descriptor(buffer, "bbwb", &bos_header, host_endian);
if (bos_header.bDescriptorType != LIBUSB_DT_BOS) {
usbi_err(ctx, "unexpected descriptor %x (expected %x)",
bos_header.bDescriptorType, LIBUSB_DT_BOS);
return LIBUSB_ERROR_IO;
}
if (bos_header.bLength < LIBUSB_DT_BOS_SIZE) {
usbi_err(ctx, "invalid bos bLength (%d)", bos_header.bLength);
return LIBUSB_ERROR_IO;
}
if (bos_header.bLength > size) {
usbi_err(ctx, "short bos descriptor read %d/%d",
size, bos_header.bLength);
return LIBUSB_ERROR_IO;
}
_bos = calloc (1,
sizeof(*_bos) + bos_header.bNumDeviceCaps * sizeof(void *));
if (!_bos)
return LIBUSB_ERROR_NO_MEM;
usbi_parse_descriptor(buffer, "bbwb", _bos, host_endian);
buffer += bos_header.bLength;
size -= bos_header.bLength;
/* Get the device capability descriptors */
for (i = 0; i < bos_header.bNumDeviceCaps; i++) {
if (size < LIBUSB_DT_DEVICE_CAPABILITY_SIZE) {
usbi_warn(ctx, "short dev-cap descriptor read %d/%d",
size, LIBUSB_DT_DEVICE_CAPABILITY_SIZE);
break;
}
usbi_parse_descriptor(buffer, "bbb", &dev_cap, host_endian);
if (dev_cap.bDescriptorType != LIBUSB_DT_DEVICE_CAPABILITY) {
usbi_warn(ctx, "unexpected descriptor %x (expected %x)",
dev_cap.bDescriptorType, LIBUSB_DT_DEVICE_CAPABILITY);
break;
}
if (dev_cap.bLength < LIBUSB_DT_DEVICE_CAPABILITY_SIZE) {
usbi_err(ctx, "invalid dev-cap bLength (%d)",
dev_cap.bLength);
libusb_free_bos_descriptor(_bos);
return LIBUSB_ERROR_IO;
}
if (dev_cap.bLength > size) {
usbi_warn(ctx, "short dev-cap descriptor read %d/%d",
size, dev_cap.bLength);
break;
}
_bos->dev_capability[i] = malloc(dev_cap.bLength);
if (!_bos->dev_capability[i]) {
libusb_free_bos_descriptor(_bos);
return LIBUSB_ERROR_NO_MEM;
}
memcpy(_bos->dev_capability[i], buffer, dev_cap.bLength);
buffer += dev_cap.bLength;
size -= dev_cap.bLength;
}
_bos->bNumDeviceCaps = (uint8_t)i;
*bos = _bos;
return LIBUSB_SUCCESS;
}
