am 44023a4f: Merge "We need to update mPos when we copy a FieldPacker via its data[] member."

    }

    public FieldPacker(byte[] data) {

        mPos = 0;

        // Advance mPos to the end of the buffer, since we are copying in the

        // full data input.

        mPos = data.length;

        mLen = data.length;

        mData = data;

        mAlignment = new BitSet();

        // TODO: We should either have an actual FieldPacker copy constructor

        // or drop support for computing alignment like this. As it stands,

        // subAlign() can never work correctly for copied FieldPacker objects.

    }

    public void align(int v) {