/*
 * Copyright (c) 2010 by Intevation GmbH
 *
 * This program is free software under the LGPL (>=v2.1)
 * Read the file LGPL.txt coming with the software for details
 * or visit http://www.gnu.org/licenses/ if it does not exist.
 */

package de.intevation.gnv.util;

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

/**
 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha Teichmann</a>
 */
public class CaptureInputStream
extends      FilterInputStream
{
    protected ByteArrayOutputStream copy;

    public CaptureInputStream(InputStream in) {
        super(in);
        copy = new ByteArrayOutputStream(10*1024);
    }

    public int read() throws IOException {
        int x = in.read();
        if (x != -1) {
            copy.write(x);
        }
        return x;
    }

    public int read(byte [] b, int off, int len) throws IOException {
        int r = in.read(b, off, len);
        if (r > 0) {
            copy.write(b, off, r);
        }
        return r;
    }

    public long skip(long n) throws IOException {
        long m = in.skip(n);
        for (long i = m; i > 0L; --i) { // simulate gab
            copy.write(0);
        }
        return m;
    }

    public String copyToString() {
        return copy.toString();
    }

    public String copyToString(String charsetName)
    throws UnsupportedEncodingException
    {
        return copy.toString(charsetName);
    }

    public byte [] toByteArray() {
        return copy.toByteArray();
    }

    public void clear() {
        copy.reset();
    }
}