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blob: add blob_buf_grow()

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Signed-off-by: Felix Fietkau <nbd@openwrt.org>
This commit is contained in:
Felix Fietkau 2013-02-10 20:43:33 +01:00
parent 9a3519536b
commit b786f85267
2 changed files with 13 additions and 6 deletions
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18
blob.c
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@ -50,6 +50,17 @@ attr_to_offset(struct blob_buf *buf, struct blob_attr *attr)
return (char *)attr - (char *) buf->buf; return (char *)attr - (char *) buf->buf;
} }
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 * static struct blob_attr *
blob_add(struct blob_buf *buf, struct blob_attr *pos, int id, int payload) blob_add(struct blob_buf *buf, struct blob_attr *pos, int id, int payload)
{ {
@ -58,12 +69,7 @@ blob_add(struct blob_buf *buf, struct blob_attr *pos, int id, int payload)
struct blob_attr *attr; struct blob_attr *attr;
if (required > 0) { if (required > 0) {
int offset_head = attr_to_offset(buf, buf->head); blob_buf_grow(buf, required);
if (!buf->grow || !buf->grow(buf, required))
return NULL;
buf->head = offset_to_attr(buf, offset_head);
attr = offset_to_attr(buf, offset); attr = offset_to_attr(buf, offset);
} else { } else {
attr = pos; attr = pos;

1
blob.h
View file

@ -238,6 +238,7 @@ extern void blob_set_raw_len(struct blob_attr *attr, unsigned int len);
extern bool blob_attr_equal(const struct blob_attr *a1, const struct blob_attr *a2); extern bool blob_attr_equal(const struct blob_attr *a1, const struct blob_attr *a2);
extern int blob_buf_init(struct blob_buf *buf, int id); extern int blob_buf_init(struct blob_buf *buf, int id);
extern void blob_buf_free(struct blob_buf *buf); extern void blob_buf_free(struct blob_buf *buf);
extern void blob_buf_grow(struct blob_buf *buf, int required);
extern struct blob_attr *blob_new(struct blob_buf *buf, int id, int payload); 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_start(struct blob_buf *buf, int id);
extern void blob_nest_end(struct blob_buf *buf, void *cookie); extern void blob_nest_end(struct blob_buf *buf, void *cookie);