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+(NSData*) dataWithInputStream:(NSInputStream*) stream {
  
  NSMutableData * data = [NSMutableData data];
  [stream open];
  NSInteger result;
  uint8_t buffer[1024]; // BUFFER_LEN can be any positive integer
  
  while((result = [stream read:buffer maxLength:1024]) != 0) {
    if(result > 0) {
      // buffer contains result bytes of data to be handled
      [data appendBytes:buffer length:result];
    } else {
      // The stream had an error. You can get an NSError object using [iStream streamError]
      if (result<0) {
        [NSException raise:@"STREAM_ERROR" format:@"%@", [stream streamError]];
      }
    }
  }
  return data;
}