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Date:   Mon, 28 Dec 2020 18:04:55 +0800
Message-Id: <20201228180429.Bluez.v2.1.Ie32770d0eed2e7739ce9d17d920766fb6aee8583@changeid>
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Subject: [Bluez PATCH v2 1/4] shared/mgmt: Add supports of parsing mgmt tlv list
From:   Howard Chung <howardchung@google.com>
To:     linux-bluetooth <linux-bluetooth@vger.kernel.org>,
        luiz.dentz@gmail.com
Cc:     mcchou@chromium.org, mmandlik@chromium.org, apusaka@chromium.org,
        Howard Chung <howardchung@google.com>
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Precedence: bulk

Response from Read System Default Configuration is a list of mgmt_tlv,
which requires further processing to get the values of each parameters.

This adds APIs for parsing response into mgmt_tlv_list, retrieving
parameter from mgmt_tlv_list.

Reviewed-by: apusaka@chromium.org
---

Changes in v2:
- Fix incompatible pointer type error in mgmt_tlv_list_load_from_buf

 src/shared/mgmt.c | 38 ++++++++++++++++++++++++++++++++++++++
 src/shared/mgmt.h |  6 ++++++
 2 files changed, 44 insertions(+)

diff --git a/src/shared/mgmt.c b/src/shared/mgmt.c
index 9ea9974f5535..dc8107846668 100644
--- a/src/shared/mgmt.c
+++ b/src/shared/mgmt.c
@@ -626,6 +626,44 @@ static void mgmt_tlv_to_buf(void *data, void *user_data)
 	*buf_ptr += entry_size;
 }
 
+struct mgmt_tlv_list *mgmt_tlv_list_load_from_buf(const uint8_t *buf,
+								uint16_t len)
+{
+	struct mgmt_tlv_list *tlv_list;
+	const uint8_t *cur = buf;
+
+	if (!len || !buf)
+		return NULL;
+
+	tlv_list = mgmt_tlv_list_new();
+
+	while (cur < buf + len) {
+		struct mgmt_tlv *entry = (struct mgmt_tlv *)cur;
+
+		cur += sizeof(*entry) + entry->length;
+		if (cur > buf + len)
+			goto failed;
+
+		if (!mgmt_tlv_add(tlv_list, entry->type, entry->length,
+								entry->value)) {
+			goto failed;
+		}
+	}
+
+	return tlv_list;
+failed:
+	mgmt_tlv_list_free(tlv_list);
+
+	return NULL;
+}
+
+void mgmt_tlv_list_foreach(struct mgmt_tlv_list *tlv_list,
+				mgmt_tlv_list_foreach_func_t callback,
+				void *user_data)
+{
+	queue_foreach(tlv_list->tlv_queue, callback, user_data);
+}
+
 unsigned int mgmt_send_tlv(struct mgmt *mgmt, uint16_t opcode, uint16_t index,
 				struct mgmt_tlv_list *tlv_list,
 				mgmt_request_func_t callback,
diff --git a/src/shared/mgmt.h b/src/shared/mgmt.h
index 319beb62f9eb..808bf4c7ff09 100644
--- a/src/shared/mgmt.h
+++ b/src/shared/mgmt.h
@@ -41,6 +41,12 @@ bool mgmt_tlv_add(struct mgmt_tlv_list *tlv_list, uint16_t type, uint8_t length,
 #define mgmt_tlv_add_fixed(_list, _type, _value) \
 	mgmt_tlv_add(_list, _type, sizeof(*(_value)), _value)
 
+struct mgmt_tlv_list *mgmt_tlv_list_load_from_buf(const uint8_t *buf,
+								uint16_t len);
+typedef void (*mgmt_tlv_list_foreach_func_t)(void *data, void *user_data);
+void mgmt_tlv_list_foreach(struct mgmt_tlv_list *tlv_list,
+				mgmt_tlv_list_foreach_func_t callback,
+				void *user_data);
 unsigned int mgmt_send_tlv(struct mgmt *mgmt, uint16_t opcode, uint16_t index,
 				struct mgmt_tlv_list *tlv_list,
 				mgmt_request_func_t callback,
-- 
2.29.2.729.g45daf8777d-goog