+ /* Continuation state - always zero */
+ *((uint8_t*)CurrResponsePos) = 0;
+
+ /* Set the total response list size to the size of the outer container plus its header size and continuation state */
+ ResponsePacket.AttributeListByteCount = 4 + *TotalResponseSize;
+
+ /* Fill in the response packet's header */
+ ResponsePacket.SDPHeader.PDU = SDP_PDU_SERVICESEARCHATTRIBUTERESPONSE;
+ ResponsePacket.SDPHeader.TransactionID = SDPHeader->TransactionID;
+ ResponsePacket.SDPHeader.ParameterLength = (ResponsePacket.AttributeListByteCount + sizeof(ResponsePacket.AttributeListByteCount));
+
+ BT_SDP_DEBUG(1, ">> Service Search Attribute Response");
+ BT_SDP_DEBUG(2, "-- Total Parameter Length: 0x%04X", ResponsePacket.SDPHeader.ParameterLength);
+
+ /* Send the completed response packet to the sender */
+ Bluetooth_SendPacket(&ResponsePacket, (sizeof(ResponsePacket.SDPHeader) + ResponsePacket.SDPHeader.ParameterLength),
+ Channel);
+}
+
+/** 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 */
+ *((uint8_t*)*ResponseBuffer) = (SDP_DATATYPE_UnsignedInt | SDP_DATASIZE_16Bit);
+ *ResponseBuffer += sizeof(uint8_t);
+
+ /* Add the Attribute ID to the created Data Element */
+ *((uint16_t*)*ResponseBuffer) = AttributeID;
+ *ResponseBuffer += sizeof(uint16_t);
+
+ /* 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, &((ClassUUID_t*)ClassUUIDs)->UUID, UUID_SIZE_BYTES)))
+ return CurrAttributeTable;
+
+ ClassUUIDListSize -= sizeof(ClassUUID_t);
+ ClassUUIDs += sizeof(ClassUUID_t);
+ }
projects / pub / USBasp.git / blobdiff