// Copyright 2003, FreeHEP.
package org.freehep.util.io;

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

/**
 * The ReaderInputStream makes a Reader look like an InputStream so one can use
 * any of the filters. This is not without danger of loosing some data.
 * 
 * IMPORTANT: inherits from InputStream rather than FilterInputStream so that
 * the correct read(byte[], int, int) method is used.
 * 
 * @author Mark Donszelmann
 * @version $Id: ReaderInputStream.java,v 1.3 2008-05-04 12:22:00 murkle Exp $
 */
public class ReaderInputStream extends InputStream {

	private Reader reader;

	/**
	 * Creates an InputStream from given Reader.
	 * 
	 * @param reader
	 *            reader to read from.
	 */
	public ReaderInputStream(Reader reader) {
		this.reader = reader;
	}

	// Note: here we may loose Unicode data.
	@Override
	public int read() throws IOException {
		return reader.read() & 0xFF;
	}

	// Note: here we may loose Unicode data.
	@Override
	public int read(byte[] b) throws IOException {
		return read(b, 0, b.length);
	}

	// Note: here we may loose Unicode data.
	@Override
	public int read(byte[] b, int off, int len) throws IOException {
		char c[] = new char[len];
		int result = reader.read(c, 0, len);
		for (int i = 0; i < len; i++) {
			b[off + i] = (byte) (c[i] & 0xFF);
		}
		return result;
	}

	@Override
	public int available() throws IOException {
		return 0;
	}

	@Override
	public void close() throws IOException {
		reader.close();
	}

	@Override
	public void mark(int readAheadLimit) {
		// Note: IOException ignored
		try {
			reader.mark(readAheadLimit);
		} catch (IOException ioe) {
			// ignored
		}
	}

	@Override
	public boolean markSupported() {
		return reader.markSupported();
	}

	@Override
	public void reset() throws IOException {
		reader.reset();
	}

	@Override
	public long skip(long n) throws IOException {
		return reader.skip(n);
	}
}