AutoEnlargeBuffer.h

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#ifndef AUTO_ENLARGE_BUFFER_H
#define AUTO_ENLARGE_BUFFER_H
 
#include <stdlib.h>
#include <string.h>  //for memcpy
 
class AutoEnlargeBuffer
{
   public :
 
      inline AutoEnlargeBuffer(int size = 128*1024);
 
      inline ~AutoEnlargeBuffer();
 
      inline void copy(void *src, int size);
 
      inline int   size() { return m_size; }
      inline void *data() { return m_buffer; }
 
 
   private :
 
      int    m_SIZE;
      int    m_size;
      void*  m_buffer;
};
 
inline AutoEnlargeBuffer::AutoEnlargeBuffer(int size)
   : m_SIZE( size ),
     m_size( 0 )
{
   m_buffer = malloc(size);
}
 
inline AutoEnlargeBuffer::~AutoEnlargeBuffer()
{
   free( m_buffer );
}
 
inline void AutoEnlargeBuffer::copy(void *src, int size)
{
   if ( size > m_SIZE ) {
      do {
     m_SIZE *= 2;
      }
      while ( size > m_SIZE );
 
      free( m_buffer );
      m_buffer = malloc(m_SIZE);
   }
 
   m_size = size;
   memcpy(m_buffer, src, size);
}
 
#endif