Merge "Fix: ExtendableBuffer"

bool BufferWithExtendableBuffer::checkAndPrepareWriting(const int pos, const int size) {

    if (isInAdditionalBuffer(pos)) {

        if (pos == mUsedAdditionalBufferSize) {

        const int tailPosition = getTailPosition();

        if (pos == tailPosition) {

            // Append data to the tail.

            if (pos + size > static_cast<int>(mAdditionalBuffer.size())) {

            if (pos + size > static_cast<int>(mAdditionalBuffer.size()) + mOriginalBufferSize) {

                // Need to extend buffer.

                if (!extendBuffer()) {

                    return false;

                }

            }

            mUsedAdditionalBufferSize += size;

        } else if (pos + size >= mUsedAdditionalBufferSize) {

        } else if (pos + size >= tailPosition) {

            // The access will beyond the tail of used region.

            return false;

        }