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/* 
 * Copyright (C) 2002-2016 XimpleWare, [email protected]
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
/*VTD-XML is protected by US patent 7133857, 7260652, an 7761459*/
/*All licenses to any parties in litigation with XimpleWare have been expressly terminated. No new license, and no renewal of any revoked license, 
 * is granted to those parties as a result of re-downloading software from this or any other website*/
package com.ximpleware.transcode;

import java.io.IOException;
import java.io.OutputStream;

import com.ximpleware.TranscodeException;


public class UTF16LE_Coder {
    public static int encode(byte[] output, int offset,int ch){
        if (ch<0x10000){ 
            output[offset] = (byte)(ch & 0xff);
            output[offset+1] =  (byte)((ch & 0xff00) >> 8);
            return 2 + offset;
        } else {
            int tmp = ch - 0x10000;
            int w1 = 0xd800 | (tmp & 0xffc00);
            int w2 = 0xdc00 | (tmp & 0x3ff);
            output[offset] = (byte)(w1 & 0xff);
            output[offset+1] = (byte)((w1 & 0xff00) >> 8);
            output[offset+2] =(byte)(w2 & 0xff);
            output[offset+3] = (byte)((w2 & 0xff00) >> 8);
            return 4 + offset;
        }
    }
    public static final void encodeAndWrite(OutputStream os, int ch)
    throws IOException, TranscodeException {
        if (ch<0x10000){ 
            os.write((ch & 0xff));
            os.write((ch & 0xff00) >> 8);
        } else {
            int tmp = ch - 0x10000;
            int w1 = 0xd800 | (tmp & 0xffc00);
            int w2 = 0xdc00 | (tmp & 0x3ff);
            os.write(w1 & 0xff);
            os.write((w1 & 0xff00) >> 8);
            os.write(w2 & 0xff);
            os.write((w2 & 0xff00) >> 8);
        }
    }
    
    public static long decode(byte[] input, int offset ){
        int val; long l;
        int temp = (input[offset+1] << 8) | input[offset];
        if (temp < 0xd800 || temp > 0xdfff) { 
            l = offset+2;
            return (l<<32)|temp;
        }else {
            val = temp;
            temp = (input[offset+3] << 8) | input[offset+2];
            val = ((temp - 0xd800) << 10) + (val - 0xdc00) + 0x10000;
            l = offset+4;
            return (l<<32)|temp;
        }
    }
    
    public static int getLen(int ch){
        if (ch <0x10000)
            return 2;
        else
            return 4;
    }
}