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blobmsg: allow data/length iterator/accessor functions to work on non-blobmsg elements

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This primarily helps with simplifying the ubus APIs.
blobmsg header presence is indicated by the BLOB_ATTR_EXTENDED bit in
the id_len field.

This changes the format ABI, but not the API.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
This commit is contained in:
Felix Fietkau 2014-03-12 20:08:27 +01:00
parent 926121113b
commit 58aec3c59a
4 changed files with 17 additions and 5 deletions
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5
blob.c
View file

@ -115,10 +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 *

9
blob.h
View file

@ -42,10 +42,11 @@ enum {
BLOB_ATTR_LAST
};
#define BLOB_ATTR_ID_MASK 0xff000000
#define BLOB_ATTR_ID_MASK 0x7f000000
#define BLOB_ATTR_ID_SHIFT 24
#define BLOB_ATTR_LEN_MASK 0x00ffffff
#define BLOB_ATTR_ALIGN 4
#define BLOB_ATTR_EXTENDED 0x80000000
struct blob_attr {
uint32_t id_len;
@ -85,6 +86,12 @@ blob_id(const struct blob_attr *attr)
return id;
}
static inline bool
blob_is_extended(const struct blob_attr *attr)
{
return !!(attr->id_len & cpu_to_be32(BLOB_ATTR_EXTENDED));
}
/*
* blob_len: returns the length of the attribute's payload
*/

1
blobmsg.c
View file

@ -181,6 +181,7 @@ blobmsg_new(struct blob_buf *buf, int type, const char *name, int payload_len, v
if (!attr)
return NULL;
attr->id_len |= be32_to_cpu(BLOB_ATTR_EXTENDED);
hdr = blob_data(attr);
hdr->namelen = cpu_to_be16(namelen);
strcpy((char *) hdr->name, (const char *)name);

7
blobmsg.h
View file

@ -65,7 +65,12 @@ static inline int blobmsg_type(const struct blob_attr *attr)
static inline void *blobmsg_data(const struct blob_attr *attr)
{
struct blobmsg_hdr *hdr = (struct blobmsg_hdr *) blob_data(attr);
return (char *) hdr + blobmsg_hdrlen(be16_to_cpu(hdr->namelen));
char *data = blob_data(attr);
if (blob_is_extended(attr))
data += blobmsg_hdrlen(be16_to_cpu(hdr->namelen));
return data;
}
static inline int blobmsg_data_len(const struct blob_attr *attr)