smb_msgbuf_used
var_start = smb_msgbuf_used(&mb);
var_end = smb_msgbuf_used(&mb);
var_start = smb_msgbuf_used(&mb);
var_end = smb_msgbuf_used(&mb);
ctx->ctx_obodylen = smb_msgbuf_used(&mb);
extern size_t smb_msgbuf_used(smb_msgbuf_t *);