Exiv2

        case BasicIo::end: newIdx = p_->size_ + offset; break;

        }

        p_->idx_ = static_cast<long>(newIdx);   //not very sure about this. need more test!!    - note by Shawn  fly2xj@gmail.com //TODO

        p_->eof_ = false;

        return 0;

        case BasicIo::end: newIdx = p_->size_ + offset; break;

        }

        p_->idx_ = newIdx;

        p_->eof_ = false;

        return 0;

    long MemIo::read(byte* buf, long rcount)

    {

        long allow = EXV_MIN(rcount, avail);

        std::memcpy(buf, &p_->data_[p_->idx_], allow);

        p_->idx_ += allow;

                else if (currentStream_ == Audio)

                    xmpData_["Xmp.audio.MediaTimeScale"] = returnBufValue(buf);

                time_scale = returnBufValue(buf);

                break;

            case MediaDuration:

                if(currentStream_ == Video)

                xmpData_["Xmp.video.ModificationDate"] = returnUnsignedBufValue(buf); break;

            case TimeScale:

                xmpData_["Xmp.video.TimeScale"] = returnBufValue(buf);

            case Duration:

                xmpData_["Xmp.video.Duration"] = returnBufValue(buf) * 1000 / timeScale_; break;

            case PreferredRate:

    private:

        //! Variable which stores Time Scale unit, used to calculate time.

        //! Variable which stores current stream being processsed.

        int currentStream_;

        //! Variable to check the end of metadata traversing.