add a json to blobmsg parsing library

blobmsg_json.c

@@ -0,0 +1,77 @@
+#include "blobmsg.h"
+#include "blobmsg_json.h"
+
+static bool blobmsg_add_object(struct blob_buf *b, json_object *obj)
+{
+	json_object_object_foreach(obj, key, val) {
+		if (!blobmsg_add_json_element(b, key, val))
+			return false;
+	}
+	return true;
+}
+
+static bool blobmsg_add_array(struct blob_buf *b, struct array_list *a)
+{
+	int i, len;
+
+	for (i = 0, len = array_list_length(a); i < len; i++) {
+		if (!blobmsg_add_json_element(b, NULL, array_list_get_idx(a, i)))
+			return false;
+	}
+
+	return true;
+}
+
+bool blobmsg_add_json_element(struct blob_buf *b, const char *name, json_object *obj)
+{
+	bool ret = true;
+	void *c;
+
+	if (!obj)
+		return false;
+
+	switch (json_object_get_type(obj)) {
+	case json_type_object:
+		c = blobmsg_open_table(b, name);
+		ret = blobmsg_add_object(b, obj);
+		blobmsg_close_table(b, c);
+		break;
+	case json_type_array:
+		c = blobmsg_open_array(b, name);
+		ret = blobmsg_add_array(b, json_object_get_array(obj));
+		blobmsg_close_array(b, c);
+		break;
+	case json_type_string:
+		blobmsg_add_string(b, name, json_object_get_string(obj));
+		break;
+	case json_type_boolean:
+		blobmsg_add_u8(b, name, json_object_get_boolean(obj));
+		break;
+	case json_type_int:
+		blobmsg_add_u32(b, name, json_object_get_int(obj));
+		break;
+	default:
+		return false;
+	}
+	return ret;
+}
+
+bool blobmsg_add_json_from_string(struct blob_buf *b, const char *str)
+{
+	json_object *obj;
+	bool ret = false;
+
+	obj = json_tokener_parse(str);
+	if (is_error(obj))
+		return false;
+
+	if (json_object_get_type(obj) != json_type_object)
+		goto out;
+
+	ret = blobmsg_add_object(b, obj);
+
+out:
+	json_object_put(obj);
+	return ret;
+}
+

blobmsg_json.h

@@ -0,0 +1,12 @@
+#ifndef __BLOBMSG_JSON_H
+#define __BLOBMSG_JSON_H
+
+#include <json/json.h>
+#include <stdbool.h>
+
+struct blob_buf;
+
+bool blobmsg_add_json_element(struct blob_buf *b, const char *name, json_object *obj);
+bool blobmsg_add_json_from_string(struct blob_buf *b, const char *str);
+
+#endif