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-rw-r--r--mpi/generic/mpih-lshift.c69
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diff --git a/mpi/generic/mpih-lshift.c b/mpi/generic/mpih-lshift.c
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-/* mpihelp-lshift.c - MPI helper functions
- * Copyright (C) 1994, 1996, 1998 Free Software Foundation, Inc.
- *
- * This file is part of G10.
- *
- * G10 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.
- *
- * G10 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, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
- *
- * Note: This code is heavily based on the GNU MP Library.
- * Actually it's the same code with only minor changes in the
- * way the data is stored; this is to support the abstraction
- * of an optional secure memory allocation which may be used
- * to avoid revealing of sensitive data due to paging etc.
- * The GNU MP Library itself is published under the LGPL;
- * however I decided to publish this code under the plain GPL.
- */
-
-#include <config.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include "mpi-internal.h"
-
-/* Shift U (pointed to by UP and USIZE digits long) CNT bits to the left
- * and store the USIZE least significant digits of the result at WP.
- * Return the bits shifted out from the most significant digit.
- *
- * Argument constraints:
- * 1. 0 < CNT < BITS_PER_MP_LIMB
- * 2. If the result is to be written over the input, WP must be >= UP.
- */
-
-mpi_limb_t
-mpihelp_lshift( mpi_ptr_t wp, mpi_ptr_t up, mpi_size_t usize,
- unsigned int cnt)
-{
- mpi_limb_t high_limb, low_limb;
- unsigned sh_1, sh_2;
- mpi_size_t i;
- mpi_limb_t retval;
-
- sh_1 = cnt;
- wp += 1;
- sh_2 = BITS_PER_MPI_LIMB - sh_1;
- i = usize - 1;
- low_limb = up[i];
- retval = low_limb >> sh_2;
- high_limb = low_limb;
- while( --i >= 0 ) {
- low_limb = up[i];
- wp[i] = (high_limb << sh_1) | (low_limb >> sh_2);
- high_limb = low_limb;
- }
- wp[i] = high_limb << sh_1;
-
- return retval;
-}
-
-