W1252Codec.java

package CacheWolf.utils;

import ewe.io.IOException;
import ewe.io.TextCodec;
import ewe.util.ByteArray;
import ewe.util.CharArray;
import ewe.util.Hashtable;

//##################################################################
public class W1252Codec implements TextCodec {
    //##################################################################
    /**
    * This is a creation option. It specifies that CR characters should be removed when
    * encoding text into ASCII.
    **/
    public static final int STRIP_CR_ON_DECODE = 0x1;
    /**
    * This is a creation option. It specifies that CR characters should be removed when
    * decoding text from ASCII.
    **/
    public static final int STRIP_CR_ON_ENCODE = 0x2;
    /**
    * This is a creation option. It specifies that CR characters should be removed when
    * decoding text from ASCII AND encoding text to ASCII.
    **/
    public static final int STRIP_CR = STRIP_CR_ON_DECODE | STRIP_CR_ON_ENCODE;

    private int flags = 0;

    //===================================================================
    public W1252Codec(int options)
    //===================================================================
    {
	flags = options;
    }

    //===================================================================
    public W1252Codec()
    //===================================================================
    {
	this(0);
    }

    private static Hashtable Uni2W1252Table = new Hashtable(64);
    static {
	Uni2W1252Table.put(new Integer(0x20ac), new Integer(128));
	Uni2W1252Table.put(new Integer(0x201a), new Integer(130));

	Uni2W1252Table.put(new Integer(0x0192), new Integer(131));
	Uni2W1252Table.put(new Integer(0x201e), new Integer(132));
	Uni2W1252Table.put(new Integer(0x2026), new Integer(133));
	Uni2W1252Table.put(new Integer(0x2020), new Integer(134));
	Uni2W1252Table.put(new Integer(0x2021), new Integer(135));
	Uni2W1252Table.put(new Integer(0x02c6), new Integer(136));
	Uni2W1252Table.put(new Integer(0x2030), new Integer(137));
	Uni2W1252Table.put(new Integer(0x160), new Integer(138));
	Uni2W1252Table.put(new Integer(0x2039), new Integer(139));
	Uni2W1252Table.put(new Integer(0x152), new Integer(140));

	Uni2W1252Table.put(new Integer(0x017d), new Integer(142));

	Uni2W1252Table.put(new Integer(0x2018), new Integer(145));
	Uni2W1252Table.put(new Integer(0x2019), new Integer(146));
	Uni2W1252Table.put(new Integer(0x201c), new Integer(147));
	Uni2W1252Table.put(new Integer(0x201d), new Integer(148));
	Uni2W1252Table.put(new Integer(0x2022), new Integer(149));
	Uni2W1252Table.put(new Integer(0x2013), new Integer(150));
	Uni2W1252Table.put(new Integer(0x2014), new Integer(151));
	Uni2W1252Table.put(new Integer(0x02dc), new Integer(152));
	Uni2W1252Table.put(new Integer(0x2122), new Integer(153));
	Uni2W1252Table.put(new Integer(0x0161), new Integer(154));
	Uni2W1252Table.put(new Integer(0x203a), new Integer(155));
	Uni2W1252Table.put(new Integer(0x0153), new Integer(156));

	Uni2W1252Table.put(new Integer(0x017e), new Integer(158));
	Uni2W1252Table.put(new Integer(0x0178), new Integer(159));

	Uni2W1252Table.put(new Integer(0x2003), new Integer(32)); //
	Uni2W1252Table.put(new Integer(0x2028), new Integer(32)); //
	Uni2W1252Table.put(new Integer(0x2032), new Integer(39)); //
	Uni2W1252Table.put(new Integer(0x2640), new Integer(119)); // w weiblich
	Uni2W1252Table.put(new Integer(0x2642), new Integer(109)); // m m�nnlich
    }

    //===================================================================
    public ByteArray encodeText(char[] text, int start, int length, boolean endOfData, ByteArray dest) throws IOException
    //===================================================================
    {
	if (dest == null)
	    dest = new ByteArray();
	if (dest.data == null || dest.data.length < length)
	    dest.data = new byte[length];
	int t = 0;
	for (int i = 0; i < length; i++) {
	    if (text[i + start] == 13 && ((flags & STRIP_CR_ON_ENCODE) != 0))
		t--;
	    else {
		int ix = text[i + start];
		if (ix > 255) {
		    Integer s = (Integer) Uni2W1252Table.get(new Integer(ix));
		    if (s == null) {
			// String six = String.valueOf(text[i + start]);
			dest.data[i + t] = '?';
		    } else {
			dest.data[i + t] = s.byteValue();
		    }
		} else {
		    dest.data[i + t] = (byte) ix;
		}
	    }
	}
	dest.length = length + t;
	return dest;
    }

    //===================================================================
    public CharArray decodeText(byte[] encoded, int start, int length, boolean endOfData, CharArray dest) throws IOException
    //===================================================================
    {
	int toPut = -1;
	if (dest == null)
	    dest = new CharArray();
	if (dest.data == null || dest.data.length < length)
	    dest.data = new char[length];
	int t = 0;
	for (int i = 0; i < length; i++) {
	    if (encoded[i + start] == 13 && ((flags & STRIP_CR_ON_DECODE) != 0))
		t--;
	    else {
		dest.data[i + t] = (char) ((int) encoded[i + start] & 0xff);
	    }
	}
	dest.length = length + t;
	return dest;
    }

    //===================================================================
    public void closeCodec() throws IOException
    //===================================================================
    {
    }

    //===================================================================
    public Object getCopy()
    //===================================================================
    {
	return new W1252Codec(flags);
    }

    //##################################################################
}
//##################################################################