+ /* Continuation state - always zero */
+ SDP_WriteData8(&CurrResponsePos, 0);
+
+ /* Set the total response list size to the size of the outer container plus its header size and continuation state */
+ ResponsePacket.AttributeListByteCount = SwapEndian_16(3 + *TotalResponseSize);
+
+ /* Calculate the total parameter length that is to be sent, including the fixed return parameters, the created attribute
+ value list and the SDP continuation state */
+ uint16_t ParamLength = (sizeof(ResponsePacket.AttributeListByteCount) +
+ (3 + *TotalResponseSize) +
+ sizeof(uint8_t));
+
+ /* Fill in the response packet's header */
+ ResponsePacket.SDPHeader.PDU = SDP_PDU_SERVICESEARCHATTRIBUTERESPONSE;
+ ResponsePacket.SDPHeader.TransactionID = SDPHeader->TransactionID;
+ ResponsePacket.SDPHeader.ParameterLength = SwapEndian_16(ParamLength);
+
+ /* Flip the endianness of the container's size */
+ *TotalResponseSize = SwapEndian_16(*TotalResponseSize);
+
+ BT_SDP_DEBUG(1, ">> Service Search Attribute Response");
+ BT_SDP_DEBUG(2, "-- Param Len 0x%04X", ParamLength);
+
+ /* Send the completed response packet to the sender */
+ Bluetooth_SendPacket(&ResponsePacket, (sizeof(ResponsePacket.SDPHeader) + ParamLength), Channel);
+}
+
+/** Adds all the Attributes in the given service table to the response that appear in the Attribute table.
+ *
+ * \param[in] AttributeTable Pointer to an Attribute table for the service to examine
+ * \param[in] AttributeList Pointer to a list of Attribute ranges
+ * \param[in] TotalAttributes Number of Attributes stored in the Attribute list
+ * \param[out] BufferPos Pointer to the output buffer position where the retrieved attributes are to be stored
+ *
+ * \return Number of bytes added to the output buffer
+ */
+static uint16_t SDP_AddListedAttributesToResponse(const ServiceAttributeTable_t* AttributeTable,
+ uint16_t AttributeList[][2], uint8_t TotalAttributes, void** BufferPos)
+{
+ uint16_t TotalResponseSize = 0;
+
+ /* Add an inner Data Element Sequence header for the current services's found Attributes */
+ uint16_t* AttributeListSize = SDP_AddDataElementHeader16(BufferPos, SDP_DATATYPE_Sequence);
+
+ /* Search through the list of Attributes one at a time looking for values in the current UUID's Attribute table */
+ for (uint8_t CurrAttribute = 0; CurrAttribute < TotalAttributes; CurrAttribute++)
+ {
+ uint16_t* AttributeIDRange = AttributeList[CurrAttribute];
+ void* AttributeValue;
+
+ /* Look through the current service's attribute list, examining all the attributes */
+ while ((AttributeValue = (void*)pgm_read_word(&AttributeTable->Data)) != NULL)
+ {
+ /* Get the current Attribute's ID from the current attribute table entry */
+ uint16_t CurrAttributeID = pgm_read_word(&AttributeTable->AttributeID);
+
+ /* Check if the current Attribute's ID is within the current Attribute range */
+ if ((CurrAttributeID >= AttributeIDRange[0]) && (CurrAttributeID <= AttributeIDRange[1]))
+ {
+ BT_SDP_DEBUG(2, " -- Add Attribute 0x%04X", CurrAttributeID);
+
+ /* Increment the current UUID's returned Attribute container size by the number of added bytes */
+ *AttributeListSize += SDP_AddAttributeToResponse(CurrAttributeID, AttributeValue, BufferPos);
+ }
+
+ AttributeTable++;
+ }
+
+ /* Increment the outer container size by the number of added bytes */
+ TotalResponseSize += 3 + *AttributeListSize;
+ }
+
+ /* Fix endianness of the added attribute data element sequence */
+ *AttributeListSize = SwapEndian_16(*AttributeListSize);
+
+ return TotalResponseSize;
+}
+
+/** Adds the given attribute ID and value to the reponse buffer, and advances the response buffer pointer past the added data.
+ *
+ * \param[in] AttributeID Attribute ID to add to the response buffer
+ * \param[in] AttributeValue Pointer to the start of the Attribute's value, located in PROGMEM
+ * \param[in, out] ResponseBuffer Pointer to a buffer where the Attribute and Attribute Value is to be added
+ *
+ * \return Number of bytes added to the response buffer
+ */
+static uint16_t SDP_AddAttributeToResponse(const uint16_t AttributeID, const void* AttributeValue, void** ResponseBuffer)
+{
+ /* Retrieve the size of the attribute value from its container header */
+ uint8_t AttributeHeaderLength;
+ uint32_t AttributeValueLength = SDP_GetLocalAttributeContainerSize(AttributeValue, &AttributeHeaderLength);
+
+ /* Add a Data Element header to the response for the Attribute ID */
+ SDP_WriteData8(ResponseBuffer, (SDP_DATATYPE_UnsignedInt | SDP_DATASIZE_16Bit));
+
+ /* Add the Attribute ID to the created Data Element */
+ SDP_WriteData16(ResponseBuffer, AttributeID);
+
+ /* Copy over the Attribute value Data Element container to the response */
+ memcpy_P(*ResponseBuffer, AttributeValue, AttributeHeaderLength + AttributeValueLength);
+ *ResponseBuffer += AttributeHeaderLength + AttributeValueLength;
+
+ return (sizeof(uint8_t) + sizeof(uint16_t) + AttributeHeaderLength + AttributeValueLength);
+}
+
+/** Retrieves a pointer to the value of the given Attribute ID from the given Attribute table.
+ *
+ * \param[in] AttributeTable Pointer to the Attribute table to search in
+ * \param[in] AttributeID Attribute ID to search for within the table
+ *
+ * \return Pointer to the start of the Attribute's value if found within the table, NULL otherwise
+ */
+static void* SDP_GetAttributeValue(const ServiceAttributeTable_t* AttributeTable, const uint16_t AttributeID)
+{
+ void* CurrTableItemData;
+
+ /* Search through the current Attribute table, abort when the terminator item has been reached */
+ while ((CurrTableItemData = (void*)pgm_read_word(&AttributeTable->Data)) != NULL)
+ {
+ /* Check if the current Attribute ID matches the search ID - if so return a pointer to it */
+ if (pgm_read_word(&AttributeTable->AttributeID) == AttributeID)
+ return CurrTableItemData;
+
+ AttributeTable++;
+ }
+
+ return NULL;
+}
+
+/** Retrieves the Attribute table for the given UUID if it exists.
+ *
+ * \param[in] UUID UUID to search for
+ *
+ * \return Pointer to the UUID's associated Attribute table if found in the global UUID table, NULL otherwise
+ */
+static ServiceAttributeTable_t* SDP_GetAttributeTable(const uint8_t* const UUID)
+{
+ /* Search through the global UUID list an item at a time */
+ for (uint8_t CurrTableItem = 0; CurrTableItem < (sizeof(SDP_Services_Table) / sizeof(ServiceTable_t)); CurrTableItem++)
+ {
+ /* Read in a pointer to the current UUID table entry's Attribute table */
+ ServiceAttributeTable_t* CurrAttributeTable = (ServiceAttributeTable_t*)pgm_read_word(&SDP_Services_Table[CurrTableItem].AttributeTable);
+
+ /* If the current table item's UUID matches the search UUID, return a pointer the table item's Attribute table */
+ if (!(memcmp_P(UUID, &SDP_Services_Table[CurrTableItem].UUID, UUID_SIZE_BYTES)))
+ return CurrAttributeTable;
+
+ /* Retrieve the list of the service's Class UUIDs from its Attribute table */
+ void* ClassUUIDs = SDP_GetAttributeValue(CurrAttributeTable, SDP_ATTRIBUTE_ID_SERVICECLASSIDS);
+
+ /* Go to the next UUID in the table if the current item does not have a list of Class UUIDs */
+ if (ClassUUIDs == NULL)
+ continue;
+
+ /* Retrieve the size of the Class UUID list and skip past the header to the first Class UUID in the list */
+ uint8_t ClassUUIDListHeaderSize;
+ uint32_t ClassUUIDListSize = SDP_GetLocalAttributeContainerSize(ClassUUIDs, &ClassUUIDListHeaderSize);
+ ClassUUIDs += ClassUUIDListHeaderSize;
+
+ /* Check each class UUID in turn for a match */
+ while (ClassUUIDListSize)
+ {
+ /* Current Service UUID's Class UUID list has a matching entry, return the Attribute table */
+ if (!(memcmp_P(UUID, &((ItemUUID_t*)ClassUUIDs)->UUID, UUID_SIZE_BYTES)))
+ return CurrAttributeTable;
+
+ ClassUUIDListSize -= sizeof(ItemUUID_t);
+ ClassUUIDs += sizeof(ItemUUID_t);
+ }
+ }
+
+ return NULL;
+}
+
+/** Reads in the collection of Attribute ranges from the input buffer's Data Element Sequence container, into the given
+ * Attribute list for later use. Once complete, the input buffer pointer is advanced to the end of the Attribute container.
+ *
+ * \param[out] AttributeList Pointer to a buffer where the list of Attribute ranges are to be stored
+ * \param[in] CurrentParameter Pointer to a Buffer containing a Data Element Sequence of Attribute and Attribute Range elements
+ *
+ * \return Total number of Attribute ranges stored in the Data Element Sequence
+ */
+static uint8_t SDP_GetAttributeList(uint16_t AttributeList[][2], const void** const CurrentParameter)
+{
+ uint8_t ElementHeaderSize;
+ uint8_t TotalAttributes = 0;
+
+ /* Retrieve the total size of the Attribute container, and unwrap the outer Data Element Sequence container */
+ uint16_t AttributeIDListLength = SDP_GetDataElementSize(CurrentParameter, &ElementHeaderSize);
+ BT_SDP_DEBUG(2, "-- Total Attribute Length: 0x%04X", AttributeIDListLength);
+ while (AttributeIDListLength)
+ {
+ /* Retrieve the size of the next Attribute in the container and get a pointer to the next free Attribute element in the list */
+ uint16_t* CurrentAttributeRange = AttributeList[TotalAttributes++];
+ uint8_t AttributeLength = SDP_GetDataElementSize(CurrentParameter, &ElementHeaderSize);
+
+ /* Copy over the starting Attribute ID and (if it the current element is a range) the ending Attribute ID */
+ memcpy(&CurrentAttributeRange[0], *CurrentParameter, AttributeLength);
+
+ /* If the element is not an Attribute Range, copy over the starting ID to the ending ID to make a range of 1 */
+ if (AttributeLength == 2)
+ CurrentAttributeRange[1] = CurrentAttributeRange[0];
+
+ /* Swap the endianness of the attribute range values */
+ CurrentAttributeRange[0] = SwapEndian_16(CurrentAttributeRange[0]);
+ CurrentAttributeRange[1] = SwapEndian_16(CurrentAttributeRange[1]);
+
+ BT_SDP_DEBUG(2, "-- Attribute: 0x%04X-0x%04X", CurrentAttributeRange[0], CurrentAttributeRange[1]);
+
+ AttributeIDListLength -= (AttributeLength + ElementHeaderSize);
+ *CurrentParameter += AttributeLength;
+ }
+
+ return TotalAttributes;
projects / pub / lufa.git / blobdiff