Add boundary check for ver2 dict reading.

        int lastCandidatePtNodePos = 0;

        // Let's loop through PtNodes in this PtNode array searching for either the terminal

        // or one of its ascendants.

        if (pos < 0 || pos >= mDictBufferSize) {

            AKLOGE("PtNode array position is invalid. pos: %d, dict size: %d",

                    pos, mDictBufferSize);

            mIsCorrupted = true;

            ASSERT(false);

            *outUnigramProbability = NOT_A_PROBABILITY;

            return 0;

        }

        for (int ptNodeCount = PatriciaTrieReadingUtils::getPtNodeArraySizeAndAdvancePosition(

                mDictRoot, &pos); ptNodeCount > 0; --ptNodeCount) {

            const int startPos = pos;

            if (pos < 0 || pos >= mDictBufferSize) {

                AKLOGE("PtNode position is invalid. pos: %d, dict size: %d", pos, mDictBufferSize);

                mIsCorrupted = true;

                ASSERT(false);

                *outUnigramProbability = NOT_A_PROBABILITY;

                return 0;

            }

            const PatriciaTrieReadingUtils::NodeFlags flags =

                    PatriciaTrieReadingUtils::getFlagsAndAdvancePosition(mDictRoot, &pos);

            const int character = PatriciaTrieReadingUtils::getCodePointAndAdvancePosition(