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https://github.com/cryb-to/cryb-to.git
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66 lines
2.2 KiB
C
66 lines
2.2 KiB
C
/*
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* Copyright (c) 2014 Dag-Erling Smørgrav
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "cryb/impl.h"
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <cryb/endian.h>
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#include <cryb/mpi.h>
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#include "cryb_mpi_impl.h"
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/*
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* Grow the underlying storage to fit at least n bits
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*/
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int
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mpi_grow(cryb_mpi *X, unsigned int n)
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{
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uint32_t *words;
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size_t size;
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if (X->words == NULL)
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MPI_FAST_INIT(X);
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size = (n + 31) / 32;
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if (X->size >= size)
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return (0);
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size = RUP(size, CRYB_MPI_SWORDS);
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if ((words = calloc(1, size * sizeof *words)) == NULL)
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return (-1);
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memcpy(words, X->words, X->size * sizeof *words);
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memset(X->words, 0, X->size * sizeof *words);
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if (X->words != X->swords)
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free(X->words);
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X->words = words;
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X->size = size;
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return (0);
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}
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