[PATCH v2 05/10] src/shared/att: Add "Find Information" request and response.

[Arman Uguray <armansito@xxxxxxxxxxxx>]

This patch adds support for the "Find Information" request and response
with their corresponding parameter structures.
---
 src/shared/att.c | 93 +++++++++++++++++++++++++++++++++++++++++++++++++++-----
 src/shared/att.h | 14 +++++++++
 2 files changed, 99 insertions(+), 8 deletions(-)

diff --git a/src/shared/att.c b/src/shared/att.c
index 8b10c30..f124731 100644
--- a/src/shared/att.c
+++ b/src/shared/att.c
@@ -192,6 +192,8 @@ static bool handle_exchange_mtu_rsp(struct bt_att *att, const uint8_t *pdu,
 	if (pdu_length != 3)
 		return false;
 
+	memset(&param, 0, sizeof(param));
+
 	param.server_rx_mtu = get_le16(pdu + 1);
 
 	request_complete(att, BT_ATT_OP_EXCHANGE_MTU_REQ, pdu[0],
@@ -200,16 +202,67 @@ static bool handle_exchange_mtu_rsp(struct bt_att *att, const uint8_t *pdu,
 	return true;
 }
 
+static bool handle_find_info_rsp(struct bt_att *att, const uint8_t *pdu,
+							uint16_t pdu_length)
+{
+	struct bt_att_find_information_rsp_param param;
+	uint8_t *information_data;
+
+	if (pdu_length < 6)
+		return false;
+
+	memset(&param, 0, sizeof(param));
+
+	param.format = pdu[1];
+	param.length = pdu_length - 2;
+
+	/* param.length is at least 4, as checked above */
+	information_data = malloc(param.length);
+	if (!information_data)
+		return false;
+
+	memcpy(information_data, pdu + 2, param.length);
+
+	param.information_data = information_data;
+
+	request_complete(att, BT_ATT_OP_FIND_INFORMATION_REQ, pdu[0],
+							&param, sizeof(param));
+
+	free(information_data);
+
+	return true;
+}
+
 static bool handle_response(struct bt_att *att, const uint8_t *pdu,
 							uint16_t pdu_length)
 {
 	uint8_t opcode = pdu[0];
+	uint8_t req_opcode;
 
-	if (opcode == BT_ATT_OP_ERROR_RESP)
+	switch (opcode) {
+	case BT_ATT_OP_ERROR_RESP:
 		return handle_error_rsp(att, pdu, pdu_length);
 
-	if (opcode == BT_ATT_OP_EXCHANGE_MTU_RESP)
-		return handle_exchange_mtu_rsp(att, pdu, pdu_length);
+	case BT_ATT_OP_EXCHANGE_MTU_RESP:
+		if (!handle_exchange_mtu_rsp(att, pdu, pdu_length)) {
+			req_opcode = BT_ATT_OP_EXCHANGE_MTU_REQ;
+			goto fail;
+		}
+		return true;
+
+	case BT_ATT_OP_FIND_INFORMATION_RESP:
+		if (!handle_find_info_rsp(att, pdu, pdu_length)) {
+			req_opcode = BT_ATT_OP_FIND_INFORMATION_REQ;
+			goto fail;
+		}
+		return true;
+
+	default:
+		break;
+	}
+
+fail:
+	request_complete(att, req_opcode, BT_ATT_OP_ERROR_RESP, NULL, 0);
 
 	return false;
 }
@@ -405,14 +458,36 @@ static bool encode_mtu_req(const void *param, uint16_t length, void *buf,
 {
 	const struct bt_att_exchange_mtu_req_param *cp = param;
 	const uint16_t len = 3;
+	uint8_t *bytes = buf;
 
-	if (length != sizeof(struct bt_att_exchange_mtu_req_param))
+	if (length != sizeof(*cp))
 		return false;
 
 	if (len > mtu)
 		return false;
 
-	put_le16(cp->client_rx_mtu, buf);
+	put_le16(cp->client_rx_mtu, bytes + 1);
+	*pdu_length = len;
+
+	return true;
+}
+
+static bool encode_find_info_req(const void *param, uint16_t length, void *buf,
+						uint16_t mtu, uint16_t *pdu_length)
+{
+	const struct bt_att_find_information_req_param *cp = param;
+	const uint16_t len = 5;
+	uint8_t *bytes = buf;
+
+	if (length != sizeof(*cp))
+		return false;
+
+	if (len > mtu)
+		return false;
+
+	put_le16(cp->start_handle, bytes + 1);
+	put_le16(cp->end_handle, bytes + 3);
+
 	*pdu_length = len;
 
 	return true;
@@ -439,10 +514,12 @@ static bool encode_pdu(uint8_t opcode, const void *param, uint16_t length,
 	if (!param)
 		return false;
 
-	if (opcode == BT_ATT_OP_EXCHANGE_MTU_REQ) {
-		return encode_mtu_req(param, length, bytes + 1,
+	if (opcode == BT_ATT_OP_EXCHANGE_MTU_REQ)
+		return encode_mtu_req(param, length, bytes, mtu, pdu_length);
+
+	if (opcode == BT_ATT_OP_FIND_INFORMATION_REQ)
+		return encode_find_info_req(param, length, bytes,
 							mtu, pdu_length);
-	}
 
 	return false;
 }
diff --git a/src/shared/att.h b/src/shared/att.h
index 8fe8805..16d852d 100644
--- a/src/shared/att.h
+++ b/src/shared/att.h
@@ -43,6 +43,20 @@ struct bt_att_exchange_mtu_rsp_param {
 	uint16_t server_rx_mtu;
 };
 
+/* Find Information */
+#define BT_ATT_OP_FIND_INFORMATION_REQ		0x04
+struct bt_att_find_information_req_param {
+	uint16_t start_handle;
+	uint16_t end_handle;
+};
+
+#define BT_ATT_OP_FIND_INFORMATION_RESP		0x05
+struct bt_att_find_information_rsp_param {
+	uint8_t format;
+	const uint8_t *information_data;
+	uint16_t length;
+};
+
 /* Error codes for Error response PDU */
 #define BT_ATT_ERROR_INVALID_HANDLE			0x01
 #define BT_ATT_ERROR_READ_NOT_PERMITTED			0x02
-- 
1.8.3.2

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