105 lines
2.8 KiB
C
105 lines
2.8 KiB
C
/**
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* @file pstm_str.c
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* @version $Format:%h%d$
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*
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* Multiprecision number implementation.
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*/
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/*
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* Copyright (c) 2017 Rambus Inc.
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* All Rights Reserved
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*
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* The latest version of this code is available at http://www.matrixssl.org
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*
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* This software is open source; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This General Public License does NOT permit incorporating this software
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* into proprietary programs. If you are unable to comply with the GPL, a
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* commercial license for this software may be purchased from Rambus at
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* http://www.rambus.com/
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*
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* This program is distributed in WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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* http://www.gnu.org/copyleft/gpl.html
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*/
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/******************************************************************************/
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#include "../cryptoImpl.h"
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#include "pstm.h"
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#include "pstm_str.h"
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#ifndef NO_PSTM_STR
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/* Static storage for pstm_str preallocated values. */
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const char *pstm_str_null = "(null)";
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const char *pstm_str_memfail = "(memory_error)";
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pstm_str pstm_str_from(psPool_t *pool, const pstm_int *a)
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{
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static unsigned char hex[16] = {
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'0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
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};
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char *b;
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unsigned char *bh;
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int neg;
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uint16_t sz = pstm_unsigned_bin_size(a);
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uint16_t i;
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int32_t err;
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if (a == NULL)
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{
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return PSTM_STR_NULL;
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}
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b = psMalloc(pool, sz * 2 + 4);
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if (!b)
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{
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return PSTM_STR_MEMFAIL;
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}
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neg = a->sign == PSTM_NEG;
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if (neg)
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{
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b[0] = '-';
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b[1] = '0';
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b[2] = sz > 0 ? 'x' : 0;
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bh = (unsigned char *) &b[3];
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bh[sz * 2] = 0;
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}
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else
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{
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b[0] = '0';
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b[1] = sz > 0 ? 'x' : 0;
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bh = (unsigned char *) &b[2];
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bh[sz * 2] = 0;
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}
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err = pstm_to_unsigned_bin(pool, a, bh);
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if (err < 0)
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{
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psFree(b, pool);
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return PSTM_STR_MEMFAIL;
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}
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for (i = sz; i-- > 0; )
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{
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bh[i * 2 + 1] = hex[bh[i] & 15];
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bh[i * 2] = hex[bh[i] / 16];
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}
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return b;
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}
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void pstm_str_free(psPool_t *pool, pstm_str str)
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{
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if (str != PSTM_STR_NULL && str != PSTM_STR_MEMFAIL)
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{
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psFree(str, pool);
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}
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}
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#endif /* NO_PSTM_STR */
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