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 bool blobmsg_check_attr(const struct blob_attr *attr, bool name)
20 const struct blobmsg_hdr *hdr;
22 if (blob_len(attr) < sizeof(struct blobmsg_hdr))
25 hdr = (void *) attr->data;
26 if (!hdr->namelen && name)
29 if (hdr->namelen > blob_len(attr) - sizeof(struct blobmsg_hdr))
32 if (hdr->name[hdr->namelen] != 0)
38 int blobmsg_parse(const struct blobmsg_policy *policy, int policy_len,
39 struct blob_attr **tb, void *data, int len)
41 struct blobmsg_hdr *hdr;
42 struct blob_attr *attr;
46 memset(tb, 0, policy_len * sizeof(*tb));
47 pslen = alloca(policy_len);
48 for (i = 0; i < policy_len; i++) {
52 pslen[i] = strlen(policy[i].name);
55 __blob_for_each_attr(attr, data, len) {
56 hdr = blob_data(attr);
57 for (i = 0; i < policy_len; i++) {
61 if (policy[i].type != BLOBMSG_TYPE_UNSPEC &&
62 blob_id(attr) != policy[i].type)
65 if (hdr->namelen != pslen[i])
68 if (!blobmsg_check_attr(attr, true))
74 if (strcmp(policy[i].name, (char *) hdr->name) != 0)
85 static struct blob_attr *
86 blobmsg_new(struct blob_buf *buf, int type, const char *name, int payload_len, void **data)
88 struct blob_attr *attr;
89 struct blobmsg_hdr *hdr;
92 if (blob_id(buf->head) == BLOBMSG_TYPE_ARRAY && !name) {
93 attr = blob_new(buf, type, payload_len);
94 *data = blob_data(attr);
98 if (blob_id(buf->head) != BLOBMSG_TYPE_TABLE || !name)
101 namelen = strlen(name);
102 attrlen = blobmsg_hdrlen(namelen) + payload_len;
103 attr = blob_new(buf, type, attrlen);
107 hdr = blob_data(attr);
108 hdr->namelen = namelen;
109 strcpy((char *) hdr->name, (const char *)name);
110 *data = blobmsg_data(attr);
116 attr_to_offset(struct blob_buf *buf, struct blob_attr *attr)
118 return (char *)attr - (char *) buf->buf;
123 blobmsg_open_nested(struct blob_buf *buf, const char *name, bool array)
125 struct blob_attr *head = buf->head;
126 int type = array ? BLOBMSG_TYPE_ARRAY : BLOBMSG_TYPE_TABLE;
127 unsigned long offset = attr_to_offset(buf, buf->head);
130 if (blob_id(head) == BLOBMSG_TYPE_ARRAY && !name)
131 return blob_nest_start(buf, type);
133 if (blob_id(head) == BLOBMSG_TYPE_TABLE && name) {
134 head = blobmsg_new(buf, type, name, 0, &data);
135 blob_set_raw_len(buf->head, blob_pad_len(buf->head) - blobmsg_hdrlen(strlen(name)));
137 return (void *)offset;
144 blobmsg_add_field(struct blob_buf *buf, int type, const char *name,
145 const void *data, int len)
147 struct blob_attr *attr;
150 if (type == BLOBMSG_TYPE_ARRAY ||
151 type == BLOBMSG_TYPE_TABLE)
154 attr = blobmsg_new(buf, type, name, len, &data_dest);
159 memcpy(data_dest, data, len);