cJSON_Compare: New function to compare json

cJSON.c

@@ -2484,3 +2484,104 @@ CJSON_PUBLIC(cJSON_bool) cJSON_IsRaw(const cJSON * const item)
 
     return (item->type & 0xFF) == cJSON_Raw;
 }
+
+CJSON_PUBLIC(cJSON_bool) cJSON_Compare(const cJSON * const a, const cJSON * const b, const cJSON_bool case_sensitive)
+{
+    if ((a == NULL) || (b == NULL) || ((a->type & 0xFF) != (b->type & 0xFF)) || cJSON_IsInvalid(a))
+    {
+        return false;
+    }
+
+    /* check if type is valid */
+    switch (a->type & 0xFF)
+    {
+        case cJSON_False:
+        case cJSON_True:
+        case cJSON_NULL:
+        case cJSON_Number:
+        case cJSON_String:
+        case cJSON_Raw:
+        case cJSON_Array:
+        case cJSON_Object:
+            break;
+
+        default:
+            return false;
+    }
+
+    /* identical objects are equal */
+    if (a == b)
+    {
+        return true;
+    }
+
+    switch (a->type & 0xFF)
+    {
+        /* in these cases and equal type is enough */
+        case cJSON_False:
+        case cJSON_True:
+        case cJSON_NULL:
+            return true;
+
+        case cJSON_Number:
+            if (a->valuedouble == b->valuedouble)
+            {
+                return true;
+            }
+            return false;
+
+        case cJSON_String:
+        case cJSON_Raw:
+            if ((a->valuestring == NULL) || (b->valuestring == NULL))
+            {
+                return false;
+            }
+            if (strcmp(a->valuestring, b->valuestring) == 0)
+            {
+                return true;
+            }
+
+            return false;
+
+        case cJSON_Array:
+        {
+            cJSON *a_element = NULL;
+            cJSON *b_element = NULL;
+            for (a_element = a->child, b_element = b->child;
+                    (a_element != NULL) && (b_element != NULL);
+                    a_element = a_element->next, b_element = b_element->next)
+            {
+                if (!cJSON_Compare(a_element, b_element, case_sensitive))
+                {
+                    return false;
+                }
+            }
+
+            return true;
+        }
+
+        case cJSON_Object:
+        {
+            cJSON *a_element = NULL;
+            cJSON_ArrayForEach(a_element, a)
+            {
+                /* TODO This has O(n^2) runtime, which is horrible! */
+                cJSON *b_element = get_object_item(b, a_element->string, case_sensitive);
+                if (b_element == NULL)
+                {
+                    return false;
+                }
+
+                if (!cJSON_Compare(a_element, b_element, case_sensitive))
+                {
+                    return false;
+                }
+            }
+
+            return true;
+        }
+
+        default:
+            return false;
+    }
+}