From d293d3ece0c11fabecda987b639f431bbcbdc274 Mon Sep 17 00:00:00 2001
From: Hauke Petersen <hauke.petersen@fu-berlin.de>
Date: Thu, 21 Mar 2019 21:45:25 +0100
Subject: [PATCH] net/bluetil/ad: add bluetil_ad_find_and_cmp()

---
 sys/include/net/bluetil/ad.h                | 16 +++++++++++++++-
 sys/net/ble/bluetil/bluetil_ad/bluetil_ad.c | 13 ++++++++++++-
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/sys/include/net/bluetil/ad.h b/sys/include/net/bluetil/ad.h
index 59ba6379b..191763472 100644
--- a/sys/include/net/bluetil/ad.h
+++ b/sys/include/net/bluetil/ad.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 Freie Universität Berlin
+ * Copyright (C) 2018,2019 Freie Universität Berlin
  *
  * This file is subject to the terms and conditions of the GNU Lesser
  * General Public License v2.1. See the file LICENSE in the top level
@@ -97,6 +97,20 @@ void bluetil_ad_init(bluetil_ad_t *ad, void *buf, size_t pos, size_t size);
 int bluetil_ad_find(const bluetil_ad_t *ad,
                     uint8_t type, bluetil_ad_data_t *data);
 
+/**
+ * @brief   Find a specific field and compare its value against the given data
+ *
+ * @param[in] ad        advertising data descriptor
+ * @param[in] type      field to search for
+ * @param[in] val       data to compare against
+ * @param[in] val_len   size of @p val in byte
+ *
+ * @return  true if the field was found and its data is equal to the given data
+ * @return  false if the field was not found or the data is not equal
+ */
+int bluetil_ad_find_and_cmp(const bluetil_ad_t *ad, uint8_t type,
+                            const void *val, size_t val_len);
+
 /**
  * @brief   Find the given field and copy its payload into a string
  *
diff --git a/sys/net/ble/bluetil/bluetil_ad/bluetil_ad.c b/sys/net/ble/bluetil/bluetil_ad/bluetil_ad.c
index f07a95516..a9f8ea2e3 100644
--- a/sys/net/ble/bluetil/bluetil_ad/bluetil_ad.c
+++ b/sys/net/ble/bluetil/bluetil_ad/bluetil_ad.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 Freie Universität Berlin
+ * Copyright (C) 2018,2019 Freie Universität Berlin
  *
  * This file is subject to the terms and conditions of the GNU Lesser
  * General Public License v2.1. See the file LICENSE in the top level
@@ -59,6 +59,17 @@ int bluetil_ad_find(const bluetil_ad_t *ad, uint8_t type,
     return BLUETIL_AD_NOTFOUND;
 }
 
+int bluetil_ad_find_and_cmp(const bluetil_ad_t *ad, uint8_t type,
+                            const void *val, size_t val_len)
+{
+    bluetil_ad_data_t field;
+
+    if (bluetil_ad_find(ad, type, &field) == BLUETIL_AD_OK) {
+        return ((field.len == val_len) && memcmp(val, field.data, val_len) == 0);
+    }
+    return 0;
+}
+
 int bluetil_ad_find_str(const bluetil_ad_t *ad, uint8_t type,
                         char *str, size_t str_len)
 {