package pcl.OpenFM.player;

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

/*
 * An Erroring InputStream when mark limits are exceeded
 * Fixes MP3SPI infinitely reading until it finds a false positive
 */
public class MarkErrorInputStream extends FilterInputStream {

	long pos;
	long marklimit;
	boolean mark_active = false;

	public MarkErrorInputStream(InputStream proxy) {
		super(proxy);
		if (!proxy.markSupported()) {
			throw new IllegalArgumentException("input stream does not support mark");
		}
	}

	private long limit(long n) throws IOException {
		if (mark_active) {
			long avail = (marklimit - pos);
			if (avail <= 0) {
				in.reset();
				throw new IOException("mark limit exceeded");
			} else if (avail < n) {
				return avail;
			}
		}
		return n;
	}

	private void addPos(long n) throws IOException {
		if (n >= 0 && mark_active) {
			pos += n;
		}
	}

	@Override
	public int read() throws IOException {
		int ret = super.read();
		addPos(1);
		return ret;
	}

	@Override
	public int read(byte[] bts) throws IOException {
		int len = (int) limit(bts.length);
		int ret = super.read(bts, 0, len);
		addPos(ret);
		return ret;
	}

	@Override
	public int read(byte[] bts, int off, int len) throws IOException {
		len = (int) limit(len);
		int ret = super.read(bts, off, len);
		addPos(ret);
		return ret;
	}

	@Override
	public long skip(long ln) throws IOException {
		ln = limit(ln);
		long ret = super.skip(ln);
		addPos(ret);
		return ret;
	}

	@Override
	public synchronized void mark(int readlimit) {
		// prevent mp3spi's insane limit of 4096001.
		if (readlimit == 4096001) {
			readlimit = 4096;
		}
		super.mark(readlimit);
		mark_active = true;
		marklimit = readlimit;
		pos = 0;
	}

	@Override
	public synchronized void reset() throws IOException {
		super.reset();
		mark_active = false;
	}

	@Override
	public int available() throws IOException {
		if (mark_active && pos >= marklimit)
			return 0; // Allows BufferedInputStream to stop reading.
		return (int) limit(super.available());
	}
}

@@ -959,24 +959,36 @@
 Exception %7B%0A
+%09%09limit(1);%0A
 %09%09int ret = 

Fix MarkErrorInputStream bug