/*
*
*
* Copyright 1990-2007 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* 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 version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
package com.sun.cdc.i18n.j2me;
import java.io.*;
/**
* Writer for UTF-8 encoded output streams. NOTE: The UTF-8 writer only
* supports UCS-2, or Unicode, to UTF-8 conversion. There is no support
* for UTF-16 encoded characters outside of the Basic Multilingual Plane
* (BMP). These are encoded in UTF-16 using previously reserved values
* between U+D800 and U+DFFF. Additionally, the UTF-8 writer does not
* support any character that requires 4 or more UTF-8 encoded bytes.
*/
public class UTF_8_Writer extends com.sun.cdc.i18n.StreamWriter {
/**
* Write a portion of an array of characters.
*
* @param cbuf Array of characters
* @param off Offset from which to start writing characters
* @param len Number of characters to write
*
* @exception IOException If an I/O error occurs
*/
public void write(char cbuf[], int off, int len) throws IOException {
byte[] outputByte = new byte[3]; // Never more than 3 encoded bytes
char inputChar;
int outputSize;
int count = 0;
while (count < len) {
inputChar = cbuf[off + count];
if (inputChar < 0x80) {
outputByte[0] = (byte)inputChar;
outputSize = 1;
} else if (inputChar < 0x800) {
outputByte[0] = (byte)(0xc0 | ((inputChar >> 6) & 0x1f));
outputByte[1] = (byte)(0x80 | (inputChar & 0x3f));
outputSize = 2;
} else {
outputByte[0] = (byte)(0xe0 | ((inputChar >> 12)) & 0x0f);
outputByte[1] = (byte)(0x80 | ((inputChar >> 6) & 0x3f));
outputByte[2] = (byte)(0x80 | (inputChar & 0x3f));
outputSize = 3;
}
out.write(outputByte, 0, outputSize);
count++;
}
}
/**
* Get the size in chars of an array of bytes.
*
* @param array Source buffer
* @param offset Offset at which to start counting characters
* @param length number of bytes to use for counting
*
* @return number of characters that would be converted
*/
public int sizeOf(char[] array, int offset, int length) {
int outputSize = 0;
int inputChar;
while (offset < length) {
inputChar = array[offset];
if (inputChar < 0x80) {
outputSize++;
} else if (inputChar < 0x800) {
outputSize += 2;
} else {
outputSize += 3;
}
offset++;
}
return outputSize;
}
}
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