resizeablestringformatter.h

跨操作系统的微型中间件

/*
    File:       ResizeableStringFormatter.h

    Contains:   Derived from StringFormatter, this transparently grows the
                output buffer if the original buffer is too small to hold all
                the data being placed in it
    
    

*/

#ifndef __RESIZEABLE_STRING_FORMATTER_H__
#define __RESIZEABLE_STRING_FORMATTER_H__

#include "StringFormatter.h"

class ResizeableStringFormatter : public StringFormatter
{
    public:
        // Pass in inBuffer=NULL and inBufSize=0 to dynamically allocate the initial buffer.
        ResizeableStringFormatter(char* inBuffer = NULL, UInt32 inBufSize = 0)
            : StringFormatter(inBuffer, inBufSize), fOriginalBuffer(inBuffer) {}
        
        //If we've been forced to increase the buffer size, fStartPut WILL be a dynamically allocated
        //buffer, and it WON'T be equal to fOriginalBuffer (obviously).
        virtual ~ResizeableStringFormatter() {  if (fStartPut != fOriginalBuffer) delete [] fStartPut; }

    private:
        
        // This function will get called by StringFormatter if the current
        // output buffer is full. This object allocates a buffer that's twice
        // as big as the old one.
        virtual void    BufferIsFull(char* inBuffer, UInt32 inBufferLen);
        
        char*           fOriginalBuffer;
        
};

#endif //__RESIZEABLE_STRING_FORMATTER_H__