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.
24 static bool blobmsg_puts(struct strbuf *s, const char *c, int len)
29 if (s->pos + len >= s->len) {
31 s->buf = realloc(s->buf, s->len);
35 memcpy(s->buf + s->pos, c, len);
40 static void blobmsg_format_string(struct strbuf *s, const char *str)
42 const char *p, *last = str, *end = str + strlen(str);
43 char buf[8] = "\\u00";
45 blobmsg_puts(s, "\"", 1);
46 for (p = str; *p; p++) {
78 blobmsg_puts(s, last, p - last);
83 sprintf(buf + 4, "%02x", (unsigned char) *p);
88 blobmsg_puts(s, buf, len);
91 blobmsg_puts(s, last, end - last);
92 blobmsg_puts(s, "\"", 1);
95 static void blobmsg_format_json_list(struct strbuf *s, struct blob_attr *attr, int len, bool array);
97 static void blobmsg_format_element(struct strbuf *s, struct blob_attr *attr, bool array, bool head)
103 if (!array && blobmsg_name(attr)[0]) {
104 blobmsg_format_string(s, blobmsg_name(attr));
105 blobmsg_puts(s, ":", 1);
108 data = blob_data(attr);
109 len = blob_len(attr);
111 data = blobmsg_data(attr);
112 len = blobmsg_data_len(attr);
115 switch(blob_id(attr)) {
116 case BLOBMSG_TYPE_INT8:
117 sprintf(buf, "%d", *(uint8_t *)data);
119 case BLOBMSG_TYPE_INT16:
120 sprintf(buf, "%d", *(uint16_t *)data);
122 case BLOBMSG_TYPE_INT32:
123 sprintf(buf, "%d", *(uint32_t *)data);
125 case BLOBMSG_TYPE_INT64:
126 sprintf(buf, "%lld", *(uint64_t *)data);
128 case BLOBMSG_TYPE_STRING:
129 blobmsg_format_string(s, data);
131 case BLOBMSG_TYPE_ARRAY:
132 blobmsg_format_json_list(s, data, len, true);
134 case BLOBMSG_TYPE_TABLE:
135 blobmsg_format_json_list(s, data, len, false);
138 blobmsg_puts(s, buf, strlen(buf));
141 static void blobmsg_format_json_list(struct strbuf *s, struct blob_attr *attr, int len, bool array)
143 struct blob_attr *pos;
147 blobmsg_puts(s, (array ? "[ " : "{ "), 2);
148 __blob_for_each_attr(pos, attr, rem) {
150 blobmsg_puts(s, ", ", 2);
152 blobmsg_format_element(s, pos, array, false);
155 blobmsg_puts(s, (array ? " ]" : " }"), 2);
158 char *blobmsg_format_json(struct blob_attr *attr, bool list)
162 s.len = blob_len(attr);
163 s.buf = malloc(s.len);
167 blobmsg_format_json_list(&s, blob_data(attr), blob_len(attr), false);
169 blobmsg_format_element(&s, attr, false, false);
174 s.buf = realloc(s.buf, s.pos + 1);
178 static const int blob_type[__BLOBMSG_TYPE_LAST] = {
179 [BLOBMSG_TYPE_INT8] = BLOB_ATTR_INT8,
180 [BLOBMSG_TYPE_INT16] = BLOB_ATTR_INT16,
181 [BLOBMSG_TYPE_INT32] = BLOB_ATTR_INT32,
182 [BLOBMSG_TYPE_INT64] = BLOB_ATTR_INT64,
183 [BLOBMSG_TYPE_STRING] = BLOB_ATTR_STRING,
186 bool blobmsg_check_attr(const struct blob_attr *attr, bool name)
188 const struct blobmsg_hdr *hdr;
192 if (blob_len(attr) < sizeof(struct blobmsg_hdr))
195 hdr = (void *) attr->data;
196 if (!hdr->namelen && name)
199 if (hdr->namelen > blob_len(attr) - sizeof(struct blobmsg_hdr))
202 if (hdr->name[hdr->namelen] != 0)
206 len = blobmsg_data_len(attr);
207 data = blobmsg_data(attr);
209 if (!id || id > BLOBMSG_TYPE_LAST)
215 return blob_check_type(data, len, blob_type[id]);
218 int blobmsg_parse(const struct blobmsg_policy *policy, int policy_len,
219 struct blob_attr **tb, void *data, int len)
221 struct blobmsg_hdr *hdr;
222 struct blob_attr *attr;
226 memset(tb, 0, policy_len * sizeof(*tb));
227 pslen = alloca(policy_len);
228 for (i = 0; i < policy_len; i++) {
232 pslen[i] = strlen(policy[i].name);
235 __blob_for_each_attr(attr, data, len) {
236 hdr = blob_data(attr);
237 for (i = 0; i < policy_len; i++) {
241 if (policy[i].type != BLOBMSG_TYPE_UNSPEC &&
242 blob_id(attr) != policy[i].type)
245 if (hdr->namelen != pslen[i])
248 if (!blobmsg_check_attr(attr, true))
254 if (strcmp(policy[i].name, (char *) hdr->name) != 0)
265 static struct blob_attr *
266 blobmsg_new(struct blob_buf *buf, int type, const char *name, int payload_len, void **data)
268 struct blob_attr *attr;
269 struct blobmsg_hdr *hdr;
270 int attrlen, namelen;
275 namelen = strlen(name);
276 attrlen = blobmsg_hdrlen(namelen) + payload_len;
277 attr = blob_new(buf, type, attrlen);
281 hdr = blob_data(attr);
282 hdr->namelen = namelen;
283 strcpy((char *) hdr->name, (const char *)name);
284 *data = blobmsg_data(attr);
290 attr_to_offset(struct blob_buf *buf, struct blob_attr *attr)
292 return (char *)attr - (char *) buf->buf;
297 blobmsg_open_nested(struct blob_buf *buf, const char *name, bool array)
299 struct blob_attr *head = buf->head;
300 int type = array ? BLOBMSG_TYPE_ARRAY : BLOBMSG_TYPE_TABLE;
301 unsigned long offset = attr_to_offset(buf, buf->head);
307 head = blobmsg_new(buf, type, name, 0, &data);
308 blob_set_raw_len(buf->head, blob_pad_len(buf->head) - blobmsg_hdrlen(strlen(name)));
310 return (void *)offset;
314 blobmsg_add_field(struct blob_buf *buf, int type, const char *name,
315 const void *data, int len)
317 struct blob_attr *attr;
320 if (type == BLOBMSG_TYPE_ARRAY ||
321 type == BLOBMSG_TYPE_TABLE)
324 attr = blobmsg_new(buf, type, name, len, &data_dest);
329 memcpy(data_dest, data, len);