支持mark()和reset()的轻量级java.io.InputStream实现

import java.io.IOException;
import java.io.InputStream;

public class LightweightInputStream extends InputStream {
    private byte[] data;
    private int position;
    private int mark;

    public LightweightInputStream(byte[] data) {
        this.data = data;
        this.position = 0;
        this.mark = 0;
    }

    @Override
    public int read() throws IOException {
        if (position >= data.length) {
            return -1;
        }
        return data[position++] & 0xFF;
    }

    @Override
    public void mark(int readlimit) {
        mark = position;
    }

    @Override
    public void reset() throws IOException {
        position = mark;
    }

    @Override
    public boolean markSupported() {
        return true;
    }
}