LIBFREESPACE_API int freespace_sendMessage(FreespaceDeviceId id,
struct freespace_message* message) {
int retVal;
uint8_t msgBuf[FREESPACE_MAX_OUTPUT_MESSAGE_SIZE];
struct FreespaceDeviceInfo info;
memset(msgBuf, 0, sizeof(msgBuf));
// Address is reserved for now and must be set to 0 by the caller.
if (message->dest == 0) {
message->dest = FREESPACE_RESERVED_ADDRESS;
}
retVal = freespace_getDeviceInfo(id, &info);
if (retVal != FREESPACE_SUCCESS) {
return retVal;
}
message->ver = info.hVer;
retVal = freespace_encode_message(message, msgBuf, FREESPACE_MAX_OUTPUT_MESSAGE_SIZE);
if (retVal <= FREESPACE_SUCCESS) {
return retVal;
}
return freespace_private_send(id, msgBuf, retVal);
}
int freespace_private_sendAsync(FreespaceDeviceId id,
const uint8_t* message,
int length,
unsigned int timeoutMs,
freespace_sendCallback callback,
void* cookie) {
#ifdef __APPLE__
// @TODO: Figure out why libusb on darwin doesn't seem to work with asynchronous messages
int rc;
rc = freespace_private_send(id, message, length);
if (callback != NULL) {
callback(id, cookie, rc);
}
return libusb_to_freespace_error(rc);
#else
struct FreespaceDevice* device;
device = findDeviceById(id);
struct libusb_transfer* transfer;
int rc;
if (device == NULL || device->state_ != FREESPACE_OPENED) {
return FREESPACE_ERROR_NOT_FOUND;
}
if (length > device->maxWriteSize_) {
return FREESPACE_ERROR_SEND_TOO_LARGE;
}
transfer = libusb_alloc_transfer(0);
if (transfer == NULL) {
return FREESPACE_ERROR_OUT_OF_MEMORY;
}
transfer->dev_handle = device->handle_;
transfer->endpoint = device->writeEndpointAddress_;
transfer->type = LIBUSB_TRANSFER_TYPE_INTERRUPT;
transfer->timeout = timeoutMs;
transfer->buffer = (unsigned char*) message;
transfer->length = length;
transfer->flags = LIBUSB_TRANSFER_FREE_TRANSFER;
if (callback != NULL) {
struct SendTransferInfo* info = (struct SendTransferInfo*) malloc(sizeof(struct SendTransferInfo));
if (info == NULL) {
libusb_free_transfer(transfer);
return FREESPACE_ERROR_OUT_OF_MEMORY;
}
info->id = id;
info->callback = callback;
info->cookie = cookie;
transfer->callback = sendCallback;
transfer->user_data = info;
} else {
transfer->callback = NULL;
transfer->user_data = NULL;
}
rc = libusb_submit_transfer(transfer);
return libusb_to_freespace_error(rc);
#endif
}