2 * blobmsg - library for generating/parsing structured blob messages
4 * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU Lesser General Public License version 2.1
8 * as published by the Free Software Foundation
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
18 int blobmsg_parse(const struct blobmsg_policy *policy, int policy_len,
19 struct blob_attr **tb, void *data, int len)
21 struct blobmsg_hdr *hdr;
22 struct blob_attr *attr;
26 memset(tb, 0, policy_len * sizeof(*tb));
27 pslen = alloca(policy_len);
28 for (i = 0; i < policy_len; i++) {
32 pslen[i] = strlen(policy[i].name);
35 __blob_for_each_attr(attr, data, len) {
36 hdr = blob_data(attr);
37 for (i = 0; i < policy_len; i++) {
41 if (policy[i].type != BLOBMSG_TYPE_UNSPEC &&
42 blob_id(attr) != policy[i].type)
45 if (hdr->namelen != pslen[i])
51 if (sizeof(*attr) + blobmsg_hdrlen(hdr->namelen) > blob_pad_len(attr))
54 if (hdr->name[hdr->namelen] != 0)
60 if (strcmp(policy[i].name, (char *) hdr->name) != 0)
71 static struct blob_attr *
72 blobmsg_new(struct blob_buf *buf, int type, const char *name, int payload_len, void **data)
74 struct blob_attr *attr;
75 struct blobmsg_hdr *hdr;
78 if (blob_id(buf->head) == BLOBMSG_TYPE_ARRAY && !name) {
79 attr = blob_new(buf, type, payload_len);
80 *data = blob_data(attr);
84 if (blob_id(buf->head) != BLOBMSG_TYPE_TABLE || !name)
87 namelen = strlen(name);
88 attrlen = blobmsg_hdrlen(namelen) + payload_len;
89 attr = blob_new(buf, type, attrlen);
93 hdr = blob_data(attr);
94 hdr->namelen = namelen;
95 strcpy((char *) hdr->name, (const char *)name);
96 *data = blobmsg_data(attr);
102 attr_to_offset(struct blob_buf *buf, struct blob_attr *attr)
104 return (char *)attr - (char *) buf->buf;
109 blobmsg_open_nested(struct blob_buf *buf, const char *name, bool array)
111 struct blob_attr *head = buf->head;
112 int type = array ? BLOBMSG_TYPE_ARRAY : BLOBMSG_TYPE_TABLE;
113 unsigned long offset = attr_to_offset(buf, buf->head);
116 if (blob_id(head) == BLOBMSG_TYPE_ARRAY && !name)
117 return blob_nest_start(buf, type);
119 if (blob_id(head) == BLOBMSG_TYPE_TABLE && name) {
120 head = blobmsg_new(buf, type, name, 0, &data);
121 blob_set_raw_len(buf->head, blob_pad_len(buf->head) - blobmsg_hdrlen(strlen(name)));
123 return (void *)offset;
130 blobmsg_add_field(struct blob_buf *buf, int type, const char *name,
131 const void *data, int len)
133 struct blob_attr *attr;
136 if (type == BLOBMSG_TYPE_ARRAY ||
137 type == BLOBMSG_TYPE_TABLE)
140 attr = blobmsg_new(buf, type, name, len, &data_dest);
145 memcpy(data_dest, data, len);