text: /*
   * Copyright (c) 2017, Respective Authors.
   *
   * The MIT License
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  #pragma once
  
  namespace eos { namespace utilities {
  
  template<size_t BlockSize=16, char PaddingChar=' '>
  class padding_ostream : public fc::buffered_ostream {
  public:
     padding_ostream( fc::ostream_ptr o, size_t bufsize = 4096 ) : buffered_ostream(o, bufsize) {}
     virtual ~padding_ostream() {}
  
     virtual size_t writesome( const char* buffer, size_t len ) {
        auto out = buffered_ostream::writesome(buffer, len);
        bytes_out += out;
        bytes_out %= BlockSize;
        return out;
     }
     virtual size_t writesome( const std::shared_ptr<const char>& buf, size_t len, size_t offset ) {
        auto out = buffered_ostream::writesome(buf, len, offset);
        bytes_out += out;
        bytes_out %= BlockSize;
        return out;
     }
     virtual void flush() {
        static const char pad = PaddingChar;
        while( bytes_out % BlockSize )
           writesome(&pad, 1);
        buffered_ostream::flush();
     }
  
  private:
     size_t bytes_out = 0;
  };
  
  } } //eos::utilities
  
  