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lib/bt/host/bluedroid/device/bdaddr.c

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+/******************************************************************************
+ *
+ *  Copyright (C) 2014 Google, Inc.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at:
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ ******************************************************************************/
+
+#include <stdio.h>
+#include <string.h>
+#include "common/bt_trace.h"
+#include "device/bdaddr.h"
+
+static inline bool ets_isxdigit(char c)
+{
+    if ((c >= '0') && (c <= '9')) {
+        return true;
+    }
+    if ((c >= 'a') && (c <= 'f')) {
+        return true;
+    }
+    return ((c >= 'A') && (c <= 'F'));
+}
+
+bool bdaddr_is_empty(const bt_bdaddr_t *addr)
+{
+    assert(addr != NULL);
+
+    uint8_t zero[sizeof(bt_bdaddr_t)] = { 0 };
+    return memcmp(addr, &zero, sizeof(bt_bdaddr_t)) == 0;
+}
+
+bool bdaddr_equals(const bt_bdaddr_t *first, const bt_bdaddr_t *second)
+{
+    assert(first != NULL);
+    assert(second != NULL);
+
+    return memcmp(first, second, sizeof(bt_bdaddr_t)) == 0;
+}
+
+bt_bdaddr_t *bdaddr_copy(bt_bdaddr_t *dest, const bt_bdaddr_t *src)
+{
+    assert(dest != NULL);
+    assert(src != NULL);
+
+    return (bt_bdaddr_t *)memcpy(dest, src, sizeof(bt_bdaddr_t));
+}
+
+const char *bdaddr_to_string(const bt_bdaddr_t *addr, char *string, size_t size)
+{
+    assert(addr != NULL);
+    assert(string != NULL);
+
+    if (size < 18) {
+        return NULL;
+    }
+
+    const uint8_t *ptr = addr->address;
+    sprintf(string, "%02x:%02x:%02x:%02x:%02x:%02x",
+            ptr[0], ptr[1], ptr[2],
+            ptr[3], ptr[4], ptr[5]);
+    return string;
+}
+
+bool string_is_bdaddr(const char *string)
+{
+    assert(string != NULL);
+
+    size_t len = strlen(string);
+    if (len != 17) {
+        return false;
+    }
+
+    for (size_t i = 0; i < len; ++i) {
+        // Every 3rd char must be ':'.
+        if (((i + 1) % 3) == 0 && string[i] != ':') {
+            return false;
+        }
+
+        // All other chars must be a hex digit.
+        if (((i + 1) % 3) != 0 && !ets_isxdigit(string[i])) {
+            return false;
+        }
+    }
+    return true;
+}
+
+bool string_to_bdaddr(const char *string, bt_bdaddr_t *addr)
+{
+    assert(string != NULL);
+    assert(addr != NULL);
+
+    bt_bdaddr_t new_addr;
+    uint8_t *ptr = new_addr.address;
+    uint32_t ptr_32[6];
+    bool ret  = sscanf(string, "%02x:%02x:%02x:%02x:%02x:%02x",
+                      &ptr_32[0], &ptr_32[1], &ptr_32[2], &ptr_32[3], &ptr_32[4], &ptr_32[5]) == 6;
+    if (ret) {
+        for (uint8_t i = 0; i < 6; i++){
+            ptr[i] = (uint8_t) ptr_32[i];
+        }
+        memcpy(addr, &new_addr, sizeof(bt_bdaddr_t));
+    }
+
+    return ret;
+}
+
+hash_index_t hash_function_bdaddr(const void *key)
+{
+    hash_index_t hash = 5381;
+    const char *bytes = (const char *)key;
+    for (size_t i = 0; i < sizeof(bt_bdaddr_t); ++i) {
+        hash = ((hash << 5) + hash) + bytes[i];
+    }
+    return hash;
+}