QMC解码-某音乐解码

最近听音乐，听得有点烦躁，想把某鹅的音乐传到某易，发现某鹅vip载的音乐都是加密的比较烦躁，网上找了好多大都要钱，所以还是自力更生写了个转码工具，不做任何商用。

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
/**
 * 
 * @author oftoo
 *
 */
public class DecodeQMC {

	private int x = -1;
	private int y = 8;
	private int dx = 1;
	private int index = -1;

	private int[][] seedMap = { 
								{ 0x4a, 0xd6, 0xca, 0x90, 0x67, 0xf7, 0x52 },
								{ 0x5e, 0x95, 0x23, 0x9f, 0x13, 0x11, 0x7e }, 
								{ 0x47, 0x74, 0x3d, 0x90, 0xaa, 0x3f, 0x51 },
								{ 0xc6, 0x09, 0xd5, 0x9f, 0xfa, 0x66, 0xf9 }, 
								{ 0xf3, 0xd6, 0xa1, 0x90, 0xa0, 0xf7, 0xf0 },
								{ 0x1d, 0x95, 0xde, 0x9f, 0x84, 0x11, 0xf4 }, 
								{ 0x0e, 0x74, 0xbb, 0x90, 0xbc, 0x3f, 0x92 },
								{ 0x00, 0x09, 0x5b, 0x9f, 0x62, 0x66, 0xa1 } 
							  };

	public int NextMask() {
		int ret;
		index++;
		if (x < 0) {
			dx = 1;
			y = ((8 - y) % 8);
			ret = ((8 - y) % 8);
			ret = 0xc3;
		} else if (x > 6) {
			dx = -1;
			y = 7 - y;
			ret = 0xd8;
		} else {
			ret = seedMap[y][x];
		}

		x += dx;
		if (index == 0x8000 || (index > 0x8000 && (index + 1) % 0x8000 == 0)) {
			return NextMask();
		}
		return ret;
	}

	public static void main(String[] args) throws Exception {
		String filename = "D:\\CloudMusic\\VipSongsDownload\\넬 - 기억을 걷는 시간 (聚集记忆的时间) .qmc3";
		FileInputStream fis = new FileInputStream(new File(filename));
		byte[] buffer = new byte[fis.available()];
		fis.read(buffer);
		DecodeQMC dc = new DecodeQMC();
		for (int i = 0; i < buffer.length; ++i) {
			buffer[i] = (byte) (dc.NextMask() ^ buffer[i]);
		}
		// 目前仅支持QQ音乐的格式 qmc3\qmcflac等 欢迎补充，不会覆盖源文件。
		FileOutputStream fos = new FileOutputStream(new File(filename.replace(".qmc3", ".mp3")));
		fos.write(buffer);
		fos.flush();
		fos.close();
		fis.close();
	}
}