EST_TBuffer.cc

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 /*                 Author: Richard Caley (rjc@cstr.ed.ac.uk)             */
 /*                   Date: Tue Aug 26 1997                               */
 /* --------------------------------------------------------------------  */
 /* Extending buffers, i.e. arrays which grow as needed. I got fed up     */
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#include <cstdlib>
#include <cstdio>
#include <cstring>
#include "EST_unix.h"
#include "EST_TBuffer.h"

template<class T>
EST_TBuffer<T>::EST_TBuffer(unsigned int size, int step)
{
  p_buffer = NULL;
  init(size, step);
}

template<class T>
EST_TBuffer<T>::~EST_TBuffer(void)
{
  // save the buffer if we have a slot
  for(int i=0; i<TBUFFER_N_OLD; i++)
    if (EST_old_buffers[i].mem == NULL)
      {
    EST_old_buffers[i].mem = p_buffer;
    EST_old_buffers[i].size = p_size*sizeof(T);
    p_buffer = NULL;
    p_size =0;
    break;
      }

  if (p_buffer)
    {
      delete[] p_buffer;
      p_buffer = NULL;
      p_size = 0;
    }
}

template<class T>
void EST_TBuffer<T>::init(unsigned int size, int step)
{
  for(int i=0; i<TBUFFER_N_OLD; i++)
    if (EST_old_buffers[i].size/sizeof(T) >= size)
      {
    p_buffer = (T *)EST_old_buffers[i].mem;
    p_size = EST_old_buffers[i].size/sizeof(T);
    EST_old_buffers[i].mem = NULL;
    EST_old_buffers[i].size = 0;
    break;
      }

  if (p_buffer == NULL)
    {
    p_buffer = new T[size];
    p_size = size;
    }
  p_step = step;
}

template<class T>
void EST_TBuffer<T>::expand_to(unsigned int req_size, bool copy)
{
  if (req_size > p_size)
    {
      unsigned int new_size = p_size;

      while(new_size < req_size)
    if (p_step >0)
      new_size += p_step;
    else
      new_size = (int)(new_size*(float)(-p_step)/100.0);

      T * new_buffer = new T[new_size];

      if (copy)
    memcpy(new_buffer, p_buffer, p_size*sizeof(T));

      delete[] p_buffer;
      p_buffer = new_buffer;
      p_size = new_size;
    }
}

template<class T>
void EST_TBuffer<T>::expand_to(unsigned int req_size, const T &set_to, int howmany)
{
  if (req_size > p_size)
    {
      unsigned int new_size = p_size;

      while(new_size < req_size)
    if (p_step >0)
      new_size += p_step;
    else
      new_size = (int)(new_size*(float)(-p_step)/100.0);

      T * new_buffer = new T[new_size];

      if (howmany<0)
    howmany=new_size;
      for(int i=0; i<howmany; i++)
    new_buffer[i] = set_to;

      delete[] p_buffer;
      p_buffer = new_buffer;
      p_size = new_size;
    }
}

template<class T>
void EST_TBuffer<T>::set(const T &set_to, int howmany)
{
  if (howmany < 0)
    howmany = p_size;

  for(int i=0; i<howmany; i++)
    p_buffer[i] = set_to;
}