RandomId.h

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/*
 * Copyright 2009 Savarese Software Research Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.savarese.com/software/ApacheLicense-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __SSRC_WSPR_UTILITY_RANDOM_ID_H
#define __SSRC_WSPR_UTILITY_RANDOM_ID_H

#include <ssrc/wispers/utility/Random.h>

__BEGIN_NS_SSRC_WSPR_UTILITY

template<typename IntType>
class RandomId {
  random_engine<IntType> _random;

public:
  typedef IntType int_type;

  void operator()(string & id) const {
    int_type data;
#define TO_HEX(c) ((c) < 10 ? (c) + '0' : 'A' + (c) - 10)

    unsigned int i = id.size();

    while(i >= 2) {
      data = _random();

      for(unsigned int j = 0; j < sizeof(int_type); ++j) {
        char c1 = ((data & 0xf0) >> 4);
        char c2 = (data & 0x0f);
        id[--i] = TO_HEX(c1);
        id[--i] = TO_HEX(c2);
        data >>= 8;
      }
    }

#undef TO_HEX
  }

  string operator()(const unsigned int bytes) const {
    string str(bytes, ' ');
    operator()(str);
    return str;
  }

};

__END_NS_SSRC_WSPR_UTILITY

#endif