148 lines
3.3 KiB
C
148 lines
3.3 KiB
C
/*
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* blobmsg - library for generating/parsing structured blob messages
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*
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* Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 2.1
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* as published by the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include "blobmsg.h"
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int blobmsg_parse(const struct blobmsg_policy *policy, int policy_len,
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struct blob_attr **tb, void *data, int len)
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{
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struct blobmsg_hdr *hdr;
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struct blob_attr *attr;
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uint8_t *pslen;
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int i;
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memset(tb, 0, policy_len * sizeof(*tb));
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pslen = alloca(policy_len);
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for (i = 0; i < policy_len; i++) {
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if (!policy[i].name)
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continue;
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pslen[i] = strlen(policy[i].name);
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}
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__blob_for_each_attr(attr, data, len) {
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hdr = blob_data(attr);
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for (i = 0; i < policy_len; i++) {
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if (!policy[i].name)
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continue;
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if (policy[i].type != BLOBMSG_TYPE_UNSPEC &&
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blob_id(attr) != policy[i].type)
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continue;
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if (hdr->namelen != pslen[i])
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continue;
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if (!hdr->namelen)
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return -1;
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if (sizeof(*attr) + blobmsg_hdrlen(hdr->namelen) > blob_pad_len(attr))
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return -1;
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if (hdr->name[hdr->namelen] != 0)
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return -1;
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if (tb[i])
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return -1;
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if (strcmp(policy[i].name, (char *) hdr->name) != 0)
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continue;
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tb[i] = attr;
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}
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}
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return 0;
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}
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static struct blob_attr *
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blobmsg_new(struct blob_buf *buf, int type, const char *name, int payload_len, void **data)
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{
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struct blob_attr *attr;
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struct blobmsg_hdr *hdr;
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int attrlen, namelen;
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if (blob_id(buf->head) == BLOBMSG_TYPE_ARRAY && !name) {
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attr = blob_new(buf, type, payload_len);
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*data = blob_data(attr);
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return attr;
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}
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if (blob_id(buf->head) != BLOBMSG_TYPE_TABLE || !name)
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return NULL;
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namelen = strlen(name);
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attrlen = blobmsg_hdrlen(namelen) + payload_len;
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attr = blob_new(buf, type, attrlen);
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if (!attr)
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return NULL;
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hdr = blob_data(attr);
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hdr->namelen = namelen;
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strcpy((char *) hdr->name, (const char *)name);
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*data = blobmsg_data(attr);
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return attr;
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}
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static inline int
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attr_to_offset(struct blob_buf *buf, struct blob_attr *attr)
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{
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return (char *)attr - (char *) buf->buf;
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}
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void *
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blobmsg_open_nested(struct blob_buf *buf, const char *name, bool array)
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{
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struct blob_attr *head = buf->head;
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int type = array ? BLOBMSG_TYPE_ARRAY : BLOBMSG_TYPE_TABLE;
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unsigned long offset = attr_to_offset(buf, buf->head);
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void *data;
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if (blob_id(head) == BLOBMSG_TYPE_ARRAY && !name)
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return blob_nest_start(buf, type);
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if (blob_id(head) == BLOBMSG_TYPE_TABLE && name) {
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head = blobmsg_new(buf, type, name, 0, &data);
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blob_set_raw_len(buf->head, blob_pad_len(buf->head) - blobmsg_hdrlen(strlen(name)));
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buf->head = head;
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return (void *)offset;
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}
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return NULL;
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}
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int
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blobmsg_add_field(struct blob_buf *buf, int type, const char *name,
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const void *data, int len)
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{
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struct blob_attr *attr;
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void *data_dest;
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if (type == BLOBMSG_TYPE_ARRAY ||
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type == BLOBMSG_TYPE_TABLE)
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return -1;
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attr = blobmsg_new(buf, type, name, len, &data_dest);
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if (!attr)
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return -1;
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if (len > 0)
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memcpy(data_dest, data, len);
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return 0;
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}
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