kc3-lang/libtommath/mp_from_sbin.c

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• Hash : 1cc289d2
  Author :
  Date : 2019-11-09T20:23:03
  

  better use of mp_isneg() and mp_iszero()

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• mp_from_sbin.c

• #include "tommath_private.h"
  #ifdef MP_FROM_SBIN_C
  /* LibTomMath, multiple-precision integer library -- Tom St Denis */
  /* SPDX-License-Identifier: Unlicense */
  
  /* read signed bin, big endian, first byte is 0==positive or 1==negative */
  mp_err mp_from_sbin(mp_int *a, const uint8_t *buf, size_t size)
  {
     mp_err err;
  
     /* read magnitude */
     if ((err = mp_from_ubin(a, buf + 1, size - 1u)) != MP_OKAY) {
        return err;
     }
  
     /* first byte is 0 for positive, non-zero for negative */
     a->sign = (buf[0] != (uint8_t)0) ? MP_NEG : MP_ZPOS;
  
     return MP_OKAY;
  }
  #endif
  

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