下面是一个字符串加密的源代码？ unsigned char *buff这个已经加密的串存放位置。请问如何通过*buff内容计算出原字符串myString里面内容？

unsigned int indexOfBuffer =0;
unsigned int temp2 =0;
unsigned int temp4 =5;
unsigned char *buff;

void main()
{
   unsigned char myString[] ={"avfdcrftgrgfrftrfg"};
   buff = new unsigned char [sizeof(myString)];
  {Initialize the buffer}
  for(int i =0;i<sizeof(myString-1),i++)
{
     putCode(buff,myString[i]);
}

}

int putCode(unsigned char *buff, unsigned char code)
{
int temp = 0;
if(8-temp2 > temp4)
{
  unsigned int temp = code;
  temp &= 0xFF;
  temp <<= temp2;
  temp |=  buff[indexOfBuffer];
  buff[indexOfBuffer] = temp;
  temp2 += temp4;
}else
{
  
  temp = 8 - temp2;
  if(temp !=0)
  {
   unsigned int x = code;
   x &= 0xFF;
   x <<= temp2;
   x &= 0xFF;
   x |= buff[indexOfBuffer];
   buff[indexOfBuffer] = x & 0xff;
      
  }  
  temp2 =0;
  indexOfBuffer++;
  unsigned int y = code;
  y >>= temp;
  buff[indexOfBuffer] = y;
  temp2 += temp4 - temp;
}
return 1;
}

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