| /* |
| * Copyright 1996-2003 Sun Microsystems, Inc. All Rights Reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code 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. Sun designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Sun in the LICENSE file that accompanied this code. |
| * |
| * This code 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 in the LICENSE file that |
| * accompanied this code). |
| * |
| * 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 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| */ |
| |
| package sun.io; |
| |
| import sun.nio.cs.ext.EUC_TW; |
| |
| /* |
| * @author Limin Shi |
| */ |
| |
| public class CharToByteEUC_TW extends CharToByteConverter |
| { |
| private final byte MSB = (byte)0x80; |
| private final byte SS2 = (byte) 0x8E; |
| private final byte P2 = (byte) 0xA2; |
| private final byte P3 = (byte) 0xA3; |
| |
| private final static EUC_TW nioCoder = new EUC_TW(); |
| |
| private static String uniTab1 = nioCoder.getUniTab1(); |
| private static String uniTab2 = nioCoder.getUniTab2(); |
| private static String uniTab3 = nioCoder.getUniTab3(); |
| private static String cnsTab1 = nioCoder.getCNSTab1(); |
| private static String cnsTab2 = nioCoder.getCNSTab2(); |
| private static String cnsTab3 = nioCoder.getCNSTab3(); |
| |
| public int flush(byte[] output, int outStart, int outEnd) |
| throws MalformedInputException |
| { |
| reset(); |
| return 0; |
| } |
| |
| public void reset() { |
| byteOff = charOff = 0; |
| } |
| |
| public boolean canConvert(char ch){ |
| if (((0xFF00 & ch) != 0) && (getNative(ch) != -1)){ |
| return true; |
| } |
| return false; |
| } |
| |
| /** |
| * Character conversion |
| */ |
| public int convert(char[] input, int inOff, int inEnd, |
| byte[] output, int outOff, int outEnd) |
| throws UnknownCharacterException, MalformedInputException, |
| ConversionBufferFullException |
| { |
| int outputSize; |
| byte [] tmpbuf = new byte[4]; |
| byte [] outputByte; |
| |
| byteOff = outOff; |
| |
| //Fixed 4122961 by bringing the charOff++ out to this |
| // loop where it belongs, changing the loop from |
| // while(){} to for(){}. |
| for (charOff = inOff; charOff < inEnd; charOff++) { |
| outputByte = tmpbuf; |
| if ( input[charOff] < 0x80) { // ASCII |
| outputSize = 1; |
| outputByte[0] = (byte)(input[charOff] & 0x7f); |
| } else { |
| outputSize = unicodeToEUC(input[charOff], outputByte); |
| } |
| |
| if (outputSize == -1) { |
| if (subMode) { |
| outputByte = subBytes; |
| outputSize = subBytes.length; |
| } else { |
| badInputLength = 1; |
| throw new UnknownCharacterException(); |
| } |
| } |
| |
| if (outEnd - byteOff < outputSize) |
| throw new ConversionBufferFullException(); |
| |
| for (int i = 0; i < outputSize; i++) |
| output[byteOff++] = outputByte[i]; |
| } |
| |
| return byteOff - outOff; |
| |
| } |
| |
| |
| /** |
| * returns the maximum number of bytes needed to convert a char |
| */ |
| public int getMaxBytesPerChar() { |
| return 4; |
| } |
| |
| |
| /** |
| * Return the character set ID |
| */ |
| public String getCharacterEncoding() { |
| return "EUC_TW"; |
| } |
| |
| |
| protected int getNative(char unicode) { |
| int i, |
| cns; // 2 chars in CNS table make 1 CNS code |
| |
| if (unicode < UniTab2[0]) { |
| if ((i = searchTab(unicode, UniTab1)) == -1) |
| return -1; |
| cns = (CNSTab1[2*i] << 16) + CNSTab1[2*i+1]; |
| return cns; |
| } else if (unicode < UniTab3[0]) { |
| if ((i = searchTab(unicode, UniTab2)) == -1) |
| return -1; |
| cns = (CNSTab2[2*i] << 16) + CNSTab2[2*i+1]; |
| return cns; |
| } else { |
| if ((i = searchTab(unicode, UniTab3)) == -1) |
| return -1; |
| cns = (CNSTab3[2*i] << 16) + CNSTab3[2*i+1]; |
| return cns; |
| } |
| } |
| |
| protected int searchTab(char code, char [] table) { |
| int i = 0, l, h; |
| |
| for (l = 0, h = table.length - 1; l < h; ) { |
| if (table[l] == code) { |
| i = l; |
| break; |
| } |
| if (table[h] == code) { |
| i = h; |
| break; |
| } |
| i = (l + h) / 2; |
| if (table[i] == code) |
| break; |
| if (table[i] < code) |
| l = i + 1; |
| else h = i - 1; |
| } |
| if (code == table[i]) { |
| return i; |
| } else { |
| return -1; |
| } |
| } |
| |
| |
| private int unicodeToEUC(char unicode, byte ebyte[]) { |
| int cns = getNative(unicode); |
| |
| if ((cns >> 16) == 0x01) { // Plane 1 |
| ebyte[0] = (byte) (((cns & 0xff00) >> 8) | MSB); |
| ebyte[1] = (byte) ((cns & 0xff) | MSB); |
| return 2; |
| } |
| |
| byte cnsPlane = (byte)(cns >> 16); |
| if (cnsPlane >= (byte)0x02) { // Plane 2 |
| ebyte[0] = SS2; |
| ebyte[1] = (byte) (cnsPlane | (byte)0xA0); |
| ebyte[2] = (byte) (((cns & 0xff00) >> 8) | MSB); |
| ebyte[3] = (byte) ((cns & 0xff) | MSB); |
| return 4; |
| } |
| |
| return -1; |
| } |
| |
| protected int unicodeToEUC(char unicode) { |
| if (unicode <= 0x7F) { // ASCII falls into EUC_TW CS0 |
| return unicode; |
| } |
| |
| int cns = getNative(unicode); |
| int plane = cns >> 16; |
| int euc = (cns & 0x0000FFFF) | 0x00008080; |
| |
| if (plane == 1) { |
| return euc; |
| } else if (plane == 2) { |
| return ((SS2 << 24) & 0xFF000000) | ((P2 << 16) & 0x00FF0000) | |
| euc; |
| } else if (plane == 3) { |
| return ((SS2 << 24) & 0xFF000000) | ((P3 << 16) & 0x00FF0000) | |
| euc; |
| } |
| |
| return -1; |
| } |
| |
| private char [] UniTab1 = uniTab1.toCharArray(); |
| private char [] UniTab2 = uniTab2.toCharArray(); |
| private char [] UniTab3 = uniTab3.toCharArray(); |
| private char [] CNSTab1 = cnsTab1.toCharArray(); |
| private char [] CNSTab2 = cnsTab2.toCharArray(); |
| private char [] CNSTab3 = cnsTab3.toCharArray(); |
| } |