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/**
 * Copyright 2003-2016 SSHTOOLS Limited. All Rights Reserved.
 *
 * For product documentation visit https://www.sshtools.com/
 *
 * This file is part of J2SSH Maverick.
 *
 * J2SSH Maverick is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * J2SSH Maverick is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with J2SSH Maverick.  If not, see .
 */
package com.sshtools.util;

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

class EOLProcessorInputStream extends InputStream {

	EOLProcessor processor;
	InputStream in;
	DynamicBuffer buf = new DynamicBuffer();
	byte[] tmp = new byte[32768];

	public EOLProcessorInputStream(int inputStyle, int outputStyle,
			InputStream in) throws IOException {
		this.in = in;
		processor = new EOLProcessor(inputStyle, outputStyle,
				buf.getOutputStream());
	}

	/**
	 * Reads the next byte of data from the input stream.
	 * 
	 * @return the next byte of data, or -1 if the end of the
	 *         stream is reached.
	 * @throws IOException
	 *             if an I/O error occurs.
	 * @todo Implement this java.io.InputStream method
	 */
	public int read() throws IOException {
		fillBuffer(1);
		return buf.getInputStream().read();
	}

	public int available() throws IOException {
		return in.available();
	}

	public int read(byte[] b, int off, int len) throws IOException {
		fillBuffer(len);
		return buf.getInputStream().read(b, off, len);
	}

	private void fillBuffer(int count) throws IOException {

		while (buf.available() < count) {
			int read = in.read(tmp);
			if (read == -1) {
				processor.close();
				buf.close();
				return;
			}
			processor.processBytes(tmp, 0, read);
		}
	}

	public void close() throws IOException {
		in.close();
	}
}