public int readRawLittleEndian32() throws IOException {
        int position = nioBuffer.position();
        int result = UnsafeDirectBufferUtil.getIntLE(address(position));
        nioBuffer.position(position + 4);
        return result;
    }
Read a 32-bit little-endian integer from the internal buffer.
jraft-rheakv/rheakv-core/src/main/java/com/alipay/sofa/jraft/rhea/serialization/impl/protostuff/io/UnsafeNioBufInput.java