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 static const int blob_type[__BLOBMSG_TYPE_LAST] = {
19 [BLOBMSG_TYPE_INT8] = BLOB_ATTR_INT8,
20 [BLOBMSG_TYPE_INT16] = BLOB_ATTR_INT16,
21 [BLOBMSG_TYPE_INT32] = BLOB_ATTR_INT32,
22 [BLOBMSG_TYPE_INT64] = BLOB_ATTR_INT64,
23 [BLOBMSG_TYPE_STRING] = BLOB_ATTR_STRING,
27 blobmsg_namelen(const struct blobmsg_hdr *hdr)
29 return be16_to_cpu(hdr->namelen);
32 bool blobmsg_check_attr(const struct blob_attr *attr, bool name)
34 const struct blobmsg_hdr *hdr;
38 if (blob_len(attr) < sizeof(struct blobmsg_hdr))
41 hdr = (void *) attr->data;
42 if (!hdr->namelen && name)
45 if (blobmsg_namelen(hdr) > blob_len(attr) - sizeof(struct blobmsg_hdr))
48 if (hdr->name[blobmsg_namelen(hdr)] != 0)
52 len = blobmsg_data_len(attr);
53 data = blobmsg_data(attr);
55 if (!id || id > BLOBMSG_TYPE_LAST)
61 return blob_check_type(data, len, blob_type[id]);
64 int blobmsg_parse(const struct blobmsg_policy *policy, int policy_len,
65 struct blob_attr **tb, void *data, int len)
67 struct blobmsg_hdr *hdr;
68 struct blob_attr *attr;
72 memset(tb, 0, policy_len * sizeof(*tb));
73 pslen = alloca(policy_len);
74 for (i = 0; i < policy_len; i++) {
78 pslen[i] = strlen(policy[i].name);
81 __blob_for_each_attr(attr, data, len) {
82 hdr = blob_data(attr);
83 for (i = 0; i < policy_len; i++) {
87 if (policy[i].type != BLOBMSG_TYPE_UNSPEC &&
88 blob_id(attr) != policy[i].type)
91 if (blobmsg_namelen(hdr) != pslen[i])
94 if (!blobmsg_check_attr(attr, true))
100 if (strcmp(policy[i].name, (char *) hdr->name) != 0)
111 static struct blob_attr *
112 blobmsg_new(struct blob_buf *buf, int type, const char *name, int payload_len, void **data)
114 struct blob_attr *attr;
115 struct blobmsg_hdr *hdr;
116 int attrlen, namelen;
121 namelen = strlen(name);
122 attrlen = blobmsg_hdrlen(namelen) + payload_len;
123 attr = blob_new(buf, type, attrlen);
127 hdr = blob_data(attr);
128 hdr->namelen = cpu_to_be16(namelen);
129 strcpy((char *) hdr->name, (const char *)name);
130 *data = blobmsg_data(attr);
136 attr_to_offset(struct blob_buf *buf, struct blob_attr *attr)
138 return (char *)attr - (char *) buf->buf;
143 blobmsg_open_nested(struct blob_buf *buf, const char *name, bool array)
145 struct blob_attr *head = buf->head;
146 int type = array ? BLOBMSG_TYPE_ARRAY : BLOBMSG_TYPE_TABLE;
147 unsigned long offset = attr_to_offset(buf, buf->head);
153 head = blobmsg_new(buf, type, name, 0, &data);
154 blob_set_raw_len(buf->head, blob_pad_len(buf->head) - blobmsg_hdrlen(strlen(name)));
156 return (void *)offset;
160 blobmsg_alloc_string_buffer(struct blob_buf *buf, const char *name, int maxlen)
162 struct blob_attr *attr;
165 attr = blobmsg_new(buf, BLOBMSG_TYPE_STRING, name, maxlen, &data_dest);
169 data_dest = blobmsg_data(attr);
170 blob_set_raw_len(buf->head, blob_pad_len(buf->head) - blob_pad_len(attr));
171 blob_set_raw_len(attr, blob_raw_len(attr) - maxlen);
177 blobmsg_add_string_buffer(struct blob_buf *buf)
179 struct blob_attr *attr;
182 attr = blob_next(buf->head);
183 len = strlen(blobmsg_data(attr)) + 1;
185 attrlen = blob_raw_len(attr) + len;
186 blob_set_raw_len(attr, attrlen);
187 blob_set_raw_len(buf->head, blob_raw_len(buf->head) + blob_pad_len(attr));
191 blobmsg_add_field(struct blob_buf *buf, int type, const char *name,
192 const void *data, int len)
194 struct blob_attr *attr;
197 attr = blobmsg_new(buf, type, name, len, &data_dest);
202 memcpy(data_dest, data, len);