com.ximpleware.transcode.UTF16BE_Coder Maven / Gradle / Ivy
/*
* Copyright (C) 2002-2012 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.
*/
package com.ximpleware.transcode;
import java.io.IOException;
import java.io.OutputStream;
import com.ximpleware.TranscodeException;
public class UTF16BE_Coder {
public static int encode(byte[] output, int offset,int ch){
if (ch<0x10000){
output[offset+1] = (byte)(ch & 0xff);
output[offset] = (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 & 0xff00) >> 8);
output[offset+1] = (byte)(w1 & 0xff);
output[offset+2] =(byte)((w2 & 0xff00) >> 8);
output[offset+3] =(byte)((w2 & 0xff));
return 4 + offset;
}
}
public static long decode(byte[] input, int offset ){
int val;
long l;
int temp = (input[offset] << 8) | input[offset+1];
if (temp < 0xd800 || temp > 0xdfff) {
l = offset+2;
return (l<<32)|temp;
}else {
val = temp;
temp = (input[offset+2] << 8) | input[offset+3];
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;
}
public static final void encodeAndWrite(OutputStream os, int ch)
throws IOException, TranscodeException {
if (ch<0x10000){
//output[offset] = (byte)((ch & 0xff00) >> 8);
os.write((ch & 0xff00) >> 8);
//output[offset+1] = (byte)(ch & 0xff);
os.write(ch);
//return 2 + offset;
} else {
int tmp = ch-0x10000;
int w1 = 0xd800 | (tmp & 0xffc00);
int w2 = 0xdc00 | (tmp & 0x3ff);
os.write((byte)((w1 & 0xff00) >> 8));
os.write((byte)(w1 & 0xff));
os.write((byte)((w2 & 0xff00) >> 8));
os.write((byte)(w2 & 0xff));
}
}
}