text: 
  /* Copyright (C) 1999-2019 by The D Language Foundation, All Rights Reserved
   * All Rights Reserved, written by Walter Bright
   * http://www.digitalmars.com
   * Distributed under the Boost Software License, Version 1.0.
   * http://www.boost.org/LICENSE_1_0.txt
   * https://github.com/dlang/dmd/blob/master/src/dmd/root/outbuffer.h
   */
  
  #pragma once
  
  #include <stdlib.h>
  #include <stdarg.h>
  #include <string.h>
  #include <assert.h>
  #include "rmem.h"
  
  class RootObject;
  
  struct OutBuffer
  {
      unsigned char *data;
      size_t offset;
      size_t size;
  
      int level;
      bool doindent;
  private:
      bool notlinehead;
  public:
  
      OutBuffer()
      {
          data = NULL;
          offset = 0;
          size = 0;
  
          doindent = 0;
          level = 0;
          notlinehead = 0;
      }
      ~OutBuffer()
      {
          mem.xfree(data);
      }
      char *extractData();
  
      void reserve(size_t nbytes);
      void setsize(size_t size);
      void reset();
      void write(const void *data, d_size_t nbytes);
      void writestring(const char *string);
      void prependstring(const char *string);
      void writenl();                     // write newline
      void writeByte(unsigned b);
      void writeUTF8(unsigned b);
      void prependbyte(unsigned b);
      void writewchar(unsigned w);
      void writeword(unsigned w);
      void writeUTF16(unsigned w);
      void write4(unsigned w);
      void write(OutBuffer *buf);
      void write(RootObject *obj);
      void fill0(size_t nbytes);
      void vprintf(const char *format, va_list args);
      void printf(const char *format, ...);
      void bracket(char left, char right);
      size_t bracket(size_t i, const char *left, size_t j, const char *right);
      void spread(size_t offset, size_t nbytes);
      size_t insert(size_t offset, const void *data, size_t nbytes);
      void remove(size_t offset, size_t nbytes);
      // Append terminating null if necessary and get view of internal buffer
      char *peekString();
      // Append terminating null if necessary and take ownership of data
      char *extractString();
  };
  