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/*****************************************************************
* gavl - a general purpose audio/video processing library
*
* Copyright (c) 2001 - 2012 Members of the Gmerlin project
* gmerlin-general@lists.sourceforge.net
* http://gmerlin.sourceforge.net
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* *****************************************************************/
/* 128 bit arithmetic routines needed for overflow save
* 64 bit rescaling functions.
*
* Mostly copied and pasted from the qofmath128.[ch] files by
* Copyright (C) 2004 Linas Vepstas <linas@linas.org>,
* which are part of gnucash (http://gnucash.org)
*/
typedef struct {
uint64_t hi;
uint64_t lo;
short isneg; /**< sign-bit -- T if number is negative */
short isbig; /**< sizeflag -- T if number won't fit in signed 64-bit */
} gavl_int128_t;
/** Multiply a pair of signed 64-bit numbers,
* returning a signed 128-bit number.
*/
void gavl_int128_mult(int64_t a, int64_t b, gavl_int128_t * ret);
/** Divide a signed 128-bit number by a signed 64-bit,
* returning a signed 128-bit number.
*/
void gavl_int128_div(gavl_int128_t * n, int64_t d, gavl_int128_t * ret);
void gavl_int128_copy(gavl_int128_t *dst, gavl_int128_t * src);
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