c3-lang/libtommath/bn_mp_shrink.c

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• Hash : 4e3f1344
  Author :
  Date : 2015-11-12T01:49:07
  

  provide tommath_private.h tommath.h contains declarations for the public part of the library. tommath_private.h contains the functions which are private to ltm and should not be exposed to the public.

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• bn_mp_shrink.c

• #include <tommath_private.h>
  #ifdef BN_MP_SHRINK_C
  /* LibTomMath, multiple-precision integer library -- Tom St Denis
   *
   * LibTomMath is a library that provides multiple-precision
   * integer arithmetic as well as number theoretic functionality.
   *
   * The library was designed directly after the MPI library by
   * Michael Fromberger but has been written from scratch with
   * additional optimizations in place.
   *
   * The library is free for all purposes without any express
   * guarantee it works.
   *
   * Tom St Denis, tstdenis82@gmail.com, http://libtom.org
   */
  
  /* shrink a bignum */
  int mp_shrink (mp_int * a)
  {
    mp_digit *tmp;
    int used = 1;
    
    if(a->used > 0) {
      used = a->used;
    }
    
    if (a->alloc != used) {
      if ((tmp = OPT_CAST(mp_digit) XREALLOC (a->dp, sizeof (mp_digit) * used)) == NULL) {
        return MP_MEM;
      }
      a->dp    = tmp;
      a->alloc = used;
    }
    return MP_OKAY;
  }
  #endif
  
  /* $Source$ */
  /* $Revision$ */
  /* $Date$ */
  

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