Initial import

1 files changed, 148 insertions, 0 deletions

diff --git a/blobmsg.c b/blobmsg.c
new file mode 100644
index 0000000..25b72ae
--- /dev/null
+++ b/blobmsg.c
@@ -0,0 +1,148 @@
+/*
+ * blobmsg - library for generating/parsing structured blob messages
+ *
+ * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include "blobmsg.h"
+
+int blobmsg_parse(const struct blobmsg_policy *policy, int policy_len,
+                  struct blob_attr **tb, void *data, int len)
+{
+	struct blobmsg_hdr *hdr;
+	struct blob_attr *attr;
+	uint8_t *pslen;
+	int i;
+
+	memset(tb, 0, policy_len * sizeof(*tb));
+	pslen = alloca(policy_len);
+	for (i = 0; i < policy_len; i++) {
+		if (!policy[i].name)
+			continue;
+
+		pslen[i] = strlen(policy[i].name);
+	}
+
+	__blob_for_each_attr(attr, data, len) {
+		hdr = blob_data(attr);
+		for (i = 0; i < policy_len; i++) {
+			if (!policy[i].name)
+				continue;
+
+			if (policy[i].type != BLOBMSG_TYPE_UNSPEC &&
+			    blob_id(attr) != policy[i].type)
+				continue;
+
+			if (hdr->namelen != pslen[i])
+				continue;
+
+			if (!hdr->namelen)
+				return -1;
+
+			if (sizeof(*attr) + blobmsg_hdrlen(hdr->namelen) > blob_pad_len(attr))
+				return -1;
+
+			if (hdr->name[hdr->namelen] != 0)
+				return -1;
+
+			if (tb[i])
+				return -1;
+
+			if (strcmp(policy[i].name, (char *) hdr->name) != 0)
+				continue;
+
+			tb[i] = attr;
+		}
+	}
+
+	return 0;
+}
+
+
+static struct blob_attr *
+blobmsg_new(struct blob_buf *buf, int type, const char *name, int payload_len, void **data)
+{
+	struct blob_attr *attr;
+	struct blobmsg_hdr *hdr;
+	int attrlen, namelen;
+
+	if (blob_id(buf->head) == BLOBMSG_TYPE_ARRAY && !name) {
+		attr = blob_new(buf, type, payload_len);
+		*data = blob_data(attr);
+		return attr;
+	}
+
+	if (blob_id(buf->head) != BLOBMSG_TYPE_TABLE || !name)
+		return NULL;
+
+	namelen = strlen(name);
+	attrlen = blobmsg_hdrlen(namelen) + payload_len;
+	attr = blob_new(buf, type, attrlen);
+	if (!attr)
+		return NULL;
+
+	hdr = blob_data(attr);
+	hdr->namelen = namelen;
+	strcpy((char *) hdr->name, (const char *)name);
+	*data = blobmsg_data(attr);
+
+	return attr;
+}
+
+static inline int
+attr_to_offset(struct blob_buf *buf, struct blob_attr *attr)
+{
+	return (char *)attr - (char *) buf->buf;
+}
+
+
+void *
+blobmsg_open_nested(struct blob_buf *buf, const char *name, bool array)
+{
+	struct blob_attr *head = buf->head;
+	int type = array ? BLOBMSG_TYPE_ARRAY : BLOBMSG_TYPE_TABLE;
+	unsigned long offset = attr_to_offset(buf, buf->head);
+	void *data;
+
+	if (blob_id(head) == BLOBMSG_TYPE_ARRAY && !name)
+		return blob_nest_start(buf, type);
+
+	if (blob_id(head) == BLOBMSG_TYPE_TABLE && name) {
+		head = blobmsg_new(buf, type, name, 0, &data);
+		blob_set_raw_len(buf->head, blob_pad_len(buf->head) - blobmsg_hdrlen(strlen(name)));
+		buf->head = head;
+		return (void *)offset;
+	}
+
+	return NULL;
+}
+
+int
+blobmsg_add_field(struct blob_buf *buf, int type, const char *name,
+                  const void *data, int len)
+{
+	struct blob_attr *attr;
+	void *data_dest;
+
+	if (type == BLOBMSG_TYPE_ARRAY ||
+	    type == BLOBMSG_TYPE_TABLE)
+		return -1;
+
+	attr = blobmsg_new(buf, type, name, len, &data_dest);
+	if (!attr)
+		return -1;
+
+	if (len > 0)
+		memcpy(data_dest, data, len);
+
+	return 0;
+}