From f2b9272e0b427545e34b27ba4be4a5b1bbc6ad69 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Mon, 31 Jan 2011 03:46:37 +0100
Subject: [PATCH] make blob attribute checking available externally

---
 blob.c | 37 +++++++++++++++++++++++++------------
 blob.h |  1 +
 2 files changed, 26 insertions(+), 12 deletions(-)

diff --git a/blob.c b/blob.c
index 3bd69fa..cafd74c 100644
--- a/blob.c
+++ b/blob.c
@@ -131,6 +131,28 @@ static const int blob_type_minlen[BLOB_ATTR_LAST] = {
 	[BLOB_ATTR_INT64] = sizeof(uint64_t),
 };
 
+bool
+blob_check_type(void *ptr, int len, int type)
+{
+	char *data = ptr;
+
+	if (type >= BLOB_ATTR_LAST)
+		return false;
+
+	if (type >= BLOB_ATTR_INT8 && type <= BLOB_ATTR_INT64) {
+		if (len != blob_type_minlen[type])
+			return false;
+	} else {
+		if (len < blob_type_minlen[type])
+			return false;
+	}
+
+	if (type == BLOB_ATTR_STRING && data[len] != 0)
+		return false;
+
+	return true;
+}
+
 int
 blob_parse(struct blob_attr *attr, struct blob_attr **data, const struct blob_attr_info *info, int max)
 {
@@ -142,27 +164,18 @@ blob_parse(struct blob_attr *attr, struct blob_attr **data, const struct blob_at
 	blob_for_each_attr(pos, attr, rem) {
 		int id = blob_id(pos);
 		int len = blob_len(pos);
-		char *pdata;
 
 		if (id >= max)
 			continue;
 
 		if (info) {
 			int type = info[id].type;
+
 			if (type < BLOB_ATTR_LAST) {
-				if (type >= BLOB_ATTR_INT8 && type <= BLOB_ATTR_INT64) {
-					if (len != blob_type_minlen[type])
-						continue;
-				} else {
-					if (len < blob_type_minlen[type])
-						continue;
-				}
+				if (!blob_check_type(blob_data(pos), len, type))
+					continue;
 			}
 
-			pdata = blob_data(pos);
-			if (type == BLOB_ATTR_STRING && pdata[len] != 0)
-				continue;
-
 			if (info[id].minlen && len < info[id].minlen)
 				continue;
 
diff --git a/blob.h b/blob.h
index a7afdcb..7d7509c 100644
--- a/blob.h
+++ b/blob.h
@@ -218,6 +218,7 @@ extern struct blob_attr *blob_new(struct blob_buf *buf, int id, int payload);
 extern void *blob_nest_start(struct blob_buf *buf, int id);
 extern void blob_nest_end(struct blob_buf *buf, void *cookie);
 extern struct blob_attr *blob_put(struct blob_buf *buf, int id, const void *ptr, int len);
+extern bool blob_check_type(void *ptr, int len, int type);
 extern int blob_parse(struct blob_attr *attr, struct blob_attr **data, const struct blob_attr_info *info, int max);
 
 static inline struct blob_attr *
-- 
2.25.1