X-Git-Url: http://git.archive.openwrt.org/?p=project%2Flibubox.git;a=blobdiff_plain;f=blob.c;h=2da7cac7e492819d00e122bcbf3334d0ebb3973e;hp=928b5c5e89e1ebb29e9137db286e0c8c5121590c;hb=c78b684104eab7a015886502a5b24333de633505;hpb=a654d2f42b39a355524e8dbbe35b8f8e1671c1c6

diff --git a/blob.c b/blob.c
index 928b5c5..2da7cac 100644
--- a/blob.c
+++ b/blob.c
@@ -40,30 +40,36 @@ blob_init(struct blob_attr *attr, int id, unsigned int len)
 static inline struct blob_attr *
 offset_to_attr(struct blob_buf *buf, int offset)
 {
-	void *ptr = (char *)buf->buf + offset;
+	void *ptr = (char *)buf->buf + offset - BLOB_COOKIE;
 	return ptr;
 }
 
 static inline int
 attr_to_offset(struct blob_buf *buf, struct blob_attr *attr)
 {
-	return (char *)attr - (char *) buf->buf;
+	return (char *)attr - (char *) buf->buf + BLOB_COOKIE;
+}
+
+void
+blob_buf_grow(struct blob_buf *buf, int required)
+{
+	int offset_head = attr_to_offset(buf, buf->head);
+
+	if (!buf->grow || !buf->grow(buf, required))
+		return;
+
+	buf->head = offset_to_attr(buf, offset_head);
 }
 
 static struct blob_attr *
 blob_add(struct blob_buf *buf, struct blob_attr *pos, int id, int payload)
 {
 	int offset = attr_to_offset(buf, pos);
-	int required = (offset + sizeof(struct blob_attr) + payload) - buf->buflen;
+	int required = (offset - BLOB_COOKIE + sizeof(struct blob_attr) + payload) - buf->buflen;
 	struct blob_attr *attr;
 
 	if (required > 0) {
-		int offset_head = attr_to_offset(buf, buf->head);
-
-		if (!buf->grow || !buf->grow(buf, required))
-			return NULL;
-
-		buf->head = offset_to_attr(buf, offset_head);
+		blob_buf_grow(buf, required);
 		attr = offset_to_attr(buf, offset);
 	} else {
 		attr = pos;
@@ -109,10 +115,9 @@ blob_fill_pad(struct blob_attr *attr)
 void
 blob_set_raw_len(struct blob_attr *attr, unsigned int len)
 {
-	int id = blob_id(attr);
 	len &= BLOB_ATTR_LEN_MASK;
-	len |= (id << BLOB_ATTR_ID_SHIFT) & BLOB_ATTR_ID_MASK;
-	attr->id_len = cpu_to_be32(len);
+	attr->id_len &= ~cpu_to_be32(BLOB_ATTR_LEN_MASK);
+	attr->id_len |= cpu_to_be32(len);
 }
 
 struct blob_attr *
@@ -129,6 +134,20 @@ blob_new(struct blob_buf *buf, int id, int payload)
 }
 
 struct blob_attr *
+blob_put_raw(struct blob_buf *buf, const void *ptr, int len)
+{
+	struct blob_attr *attr;
+
+	if (len < sizeof(struct blob_attr) || !ptr)
+		return NULL;
+
+	attr = blob_add(buf, blob_next(buf->head), 0, len - sizeof(struct blob_attr));
+	blob_set_raw_len(buf->head, blob_pad_len(buf->head) + len);
+	memcpy(attr, ptr, len);
+	return attr;
+}
+
+struct blob_attr *
 blob_put(struct blob_buf *buf, int id, const void *ptr, int len)
 {
 	struct blob_attr *attr;
@@ -243,3 +262,17 @@ blob_attr_equal(const struct blob_attr *a1, const struct blob_attr *a2)
 
 	return !memcmp(a1, a2, blob_pad_len(a1));
 }
+
+struct blob_attr *
+blob_memdup(struct blob_attr *attr)
+{
+	struct blob_attr *ret;
+	int size = blob_pad_len(attr);
+
+	ret = malloc(size);
+	if (!ret)
+		return NULL;
+
+	memcpy(ret, attr, size);
+	return ret;
+}