fis_out = new FileOutputStream("./trans_in/"+name);
f(file_size < path_size) path_size = file_size;
change_size = file_size;
byte[] path_buffer = new byte[path_size];
int read;
while(change_size > 0)
 {
read = in_stream.read(path_buffer);
fis_out.write(path_buffer, 0, read);
change_size -= read;
full_size += read;
if(change_size < path_size)
     {
      path_buffer = new byte[change_size];
      path_size = change_size;
      }
}

if(real_fileSize < real_fileSize) path_size = real_fileSize;
change_size = real_fileSize;
byte[] path_buffer = new byte[path_size];
int read;
while(change_size > 0)
{
 read = fis_in.read(path_buffer);
 full_size +=  read;
cn.out_stream.write(path_buffer); //<<<< Выскакивает исключение 
cn.out_stream.flush();
change_size -= path_size;
if(change_size < path_size)
  {
  path_buffer = new byte[change_size];
  path_size = change_size;
  }
}