char *databuf_export(DataBuf *db)
{
DATABUF_VALIDATE(db);
databuf_shift_data_to_beginning(db);
DATABUF_VALIDATE(db);
return db->alloc_ptr;
}
int databuf_append(DataBuf *db, const char *src, size_t src_size)
{
size_t new_size;
DATABUF_VALIDATE(db);
if (src == NULL || src_size == 0) return 0;
new_size = db->len+src_size;
#ifdef DEBUG
if (debug) databuf_print(db, 1, "databuf_append() size=%zd", src_size);
#endif
if ((new_size > db->alloc_size) ||
((db->flags & DATABUF_FLAG_PRESERVE_HEAD) && !databuf_tail_available(db, src_size))) {
/* not enough room, we must realloc */
void *new_alloc;
databuf_shift_data_to_beginning(db);
if ((new_alloc = realloc(db->alloc_ptr, new_size))) {
db->alloc_ptr = new_alloc;
db->alloc_size = new_size;
} else {
return -1; /* realloc failed */
}
} else {
/* we can fit within current allocation, but can we append? */
if (!databuf_tail_available(db, src_size)) {
/* we can't append in place, must create room at tail by shifting
data forward to the beginning of the allocation block */
databuf_shift_data_to_beginning(db);
}
}
#ifdef DEBUG
if (debug) databuf_print(db, 1, "databuf_append() about to memmove()");
#endif
/* pointers all set up and room availble, move the data and update */
memmove(databuf_end(db), src, src_size);
db->len = new_size;
db->max_len = MAX(db->max_len, new_size);
#ifdef DEBUG
if (debug) databuf_print(db, 1, "databuf_append() conclusion");
#endif
DATABUF_VALIDATE(db);
return 1;
}
int databuf_compress(DataBuf *db)
{
void *new_alloc;
DATABUF_VALIDATE(db);
if (databuf_beg(db) == NULL || db->len == 0) return 0;
databuf_shift_data_to_beginning(db);
if ((new_alloc = realloc(db->alloc_ptr, db->len))) {
db->alloc_ptr = new_alloc;
db->alloc_size = db->len;
} else {
return -1; /* realloc failed */
}
DATABUF_VALIDATE(db);
return 1;
}
