Merge "Fix logic error in SkipCutBuffer.cpp" am: 9efce640 am: 689a8b4b

    if (available < num) {

        int32_t newcapacity = mCapacity + (num - available);

        char * newbuffer = new char[newcapacity];

        memcpy(newbuffer, mCutBuffer, mCapacity);

        if (mWriteHead < mReadHead) {

            // data isn't continuous, need to memcpy twice

            // to move previous data to new buffer.

            size_t copyLeft = mCapacity - mReadHead;

            memcpy(newbuffer, mCutBuffer + mReadHead, copyLeft);

            memcpy(newbuffer + copyLeft, mCutBuffer, mWriteHead);

            mReadHead = 0;

            mWriteHead += copyLeft;

        } else {

            memcpy(newbuffer, mCutBuffer + mReadHead, mWriteHead - mReadHead);

            mWriteHead -= mReadHead;

            mReadHead = 0;

        }

        delete [] mCutBuffer;

        mCapacity = newcapacity;

        mCutBuffer = newbuffer;