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i need to edit the size of the data subchunk in a wav file

anurupr (6)
im using file handling in c++ to edit wav files . this is possible because wav files are uncompressed. so i added some value to the subchunksize in the header file. i was able to create a file which is of 8.1 mb but i cannot create a file bigger than that.i tried adding FF to all the 4 bytes of the subchunksize but still it doesnt go more than 8.1 mb
can anyone help me?

here is the code that i use to edit the wav file.


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#include <iostream>
#include <ios>
#include <iomanip>
#include <fstream>
#include <string>


using namespace std;


int flagh=0;
int count;
int put;
int leng1;

unsigned char readByte(ifstream &thisFile)                                        // function to read each Byte from input file
{
char buffer;
thisFile.get(buffer);
return (unsigned char)buffer;
}

void headerfn()
{


   unsigned char byteA;
 
   ifstream binheaderFile("header",ios::binary);
   ofstream wFile("output.wav",ios::binary);

   binheaderFile.seekg(0,ios::end); 
   leng1 = binheaderFile.tellg();

   binheaderFile.seekg(0,ios::beg);
 
 
 
 for(int i = 0 ; i < leng1 ; i++)       
                                                    // loop to add header file to output.wav
  {
      if(i==leng1-6)
 
      {

         byteA = 255;                                  // to change the size of the data subchunk
         wFile << byteA;
  
      }
      if(i==leng1-5)
     { 
        byteA = 255;
        wFile << byteA;
    }

     else
      {

          byteA = readByte(binheaderFile);
          wFile << byteA;

      }

 } 


      binheaderFile.close();
      put = wFile.tellp();
      wFile.close();

}

void wavmergerfn(char* filename)

{

  ifstream bindataFile(filename,ios::binary) ;      // data from  sound file

  
  ofstream wavFile("output.wav",ios::binary|ios::app);        // output
  wavFile.seekp(put);
 
  unsigned char byteB;



  bindataFile.seekg(0,ios::end);
  int leng2 = bindataFile.tellg();
  
  bindataFile.seekg(0,ios::beg);

  put = wavFile.tellp();

 
  for(int i = 0; i < leng2 ; i++)                
  {

   byteB = readByte(bindataFile);
   wavFile << byteB;

  }

  put=wavFile.tellp();
 
 

  bindataFile.close();
 
 if(count==0)

 {
 
  wavFile.close();

 }


}



int main(int argc, char * argv[])
{ 

 count = argc - 1;
 headerfn();

 int i=1;
 while(count>0)
   {
     count--;
     wavmergerfn(argv[i]); 
     i++;
   }

 return 0;
}
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