DECODER *mutt_open_decoder (STATE *s, BODY *b, int istext)
DECODER *mutt_open_decoder (const char *src, const char *dest)
DECODER *mutt_open_decoder (STATE *s, BODY *b, int istext){  DECODER *dp = safe_calloc (1, sizeof (DECODER));    dp->s = s;    if (istext && (s->flags & M_CHARCONV))  {    char *charset = mutt_get_parameter ("charset", b->parameter);    dp->is_utf8 = mutt_is_utf8 (charset) && !mutt_is_utf8 (Charset);        if (dp->is_utf8)    {      dp->sfu = new_utf8_state ();      dp->chs = mutt_get_charset (Charset);    }    else      dp->map = mutt_get_translation (charset, Charset);  }    return dp;}