text: /*  Copyright (c) 2016-2017 Drew Schmidt
      All rights reserved.
      
      Redistribution and use in source and binary forms, with or without
      modification, are permitted provided that the following conditions are met:
      
      1. Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
      
      2. Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
      
      THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
      TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
      PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
      CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
      EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
      PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
      PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
      LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
      NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
      SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
  
  #ifndef R_ARGON2_H__
  #define R_ARGON2_H__
  
  
  #include <R.h>
  #include <Rinternals.h>
  #include <stdint.h>
  
  #define ERR_IMPOSSIBLE "internal error; please alert the R package author(s)"
  
  typedef unsigned char uchar_t;
  
  #define CHARPT(x,i)	(CHAR(STRING_ELT(x,i)))
  #define INT(x) INTEGER(x)[0]
  
  static inline void random_uchars(uint8_t *const x, const size_t xlen)
  {
    GetRNGstate();
    
    for (size_t i=0; i<xlen; i++)
      x[i] = (uint8_t) ((int) 256*unif_rand()); // digit 0-255
    
    PutRNGstate();
  }
  
  
  #endif
  