newBuf := dst
	if len(dst) != len(p.readers) {
		newBuf = make([][]byte, len(p.readers))
	} else {
		for i := range newBuf {
			newBuf[i] = newBuf[i][:0]
		}
	}
	var newBufLK sync.RWMutex

	if p.offset+p.shardSize > p.shardFileSize {
		p.shardSize = p.shardFileSize - p.offset
	}
	if p.shardSize == 0 {
		return newBuf, nil
	}

                size += len;
                if (size == bufferSize) {
                    final char[] newBuf = new char[bufferSize + initialCapacity];
                    System.arraycopy(buf, 0, newBuf, 0, bufferSize);
                    buf = newBuf;
                    bufferSize += initialCapacity;
                }
            }
            return new String(buf, 0, size);