static apr_status_t lob_bucket_read(apr_bucket *e, const char **str,
apr_size_t *len, apr_read_type_e block)
{
apr_bucket_lob *a = e->data;
const apr_dbd_row_t *row = a->row;
apr_dbd_results_t *res = row->res;
int col = a->col;
apr_bucket *b = NULL;
int rv;
apr_size_t blength = e->length; /* bytes remaining in file past offset */
apr_off_t boffset = e->start;
MYSQL_BIND *bind = &res->bind[col];
*str = NULL; /* in case we die prematurely */
/* fetch from offset if not at the beginning */
if (boffset > 0) {
rv = mysql_stmt_fetch_column(res->statement, bind, col,
(unsigned long) boffset);
if (rv != 0) {
return APR_EGENERAL;
}
}
blength -= blength > bind->buffer_length ? bind->buffer_length : blength;
*len = e->length - blength;
*str = bind->buffer;
/* allocate new buffer, since we used this one for the bucket */
bind->buffer = apr_palloc(res->pool, bind->buffer_length);
/*
* Change the current bucket to refer to what we read,
* even if we read nothing because we hit EOF.
*/
apr_bucket_pool_make(e, *str, *len, res->pool);
/* If we have more to read from the field, then create another bucket */
if (blength > 0) {
/* for efficiency, we can just build a new apr_bucket struct
* to wrap around the existing LOB bucket */
b = apr_bucket_alloc(sizeof(*b), e->list);
b->start = boffset + *len;
b->length = blength;
b->data = a;
b->type = &apr_bucket_type_lob;
b->free = apr_bucket_free;
b->list = e->list;
APR_BUCKET_INSERT_AFTER(e, b);
}
else {
lob_bucket_destroy(a);
}
return APR_SUCCESS;
}
APU_DECLARE(apr_bucket *) apr_bucket_pool_create(const char *buf,
apr_size_t length,
apr_pool_t *pool,
apr_bucket_alloc_t *list)
{
apr_bucket *b = apr_bucket_alloc(sizeof(*b), list);
APR_BUCKET_INIT(b);
b->free = apr_bucket_free;
b->list = list;
return apr_bucket_pool_make(b, buf, length, pool);
}