| /* |
| * Copyright (c) 1997, Oracle and/or its affiliates. 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package sun.io; |
| |
| public abstract class CharToByteEUC extends CharToByteConverter |
| { |
| |
| private char highHalfZoneCode; |
| private byte[] outputByte; |
| |
| protected short index1[]; |
| protected String index2; |
| protected String index2a; |
| protected String index2b; |
| protected String index2c; |
| protected int mask1; |
| protected int mask2; |
| protected int shift; |
| |
| private byte[] workByte = new byte[4]; |
| |
| /** |
| * flush out any residual data and reset the buffer state |
| */ |
| public int flush(byte [] output, int outStart, int outEnd) |
| throws MalformedInputException, ConversionBufferFullException |
| { |
| |
| if (highHalfZoneCode != 0) { |
| reset(); |
| badInputLength = 0; |
| throw new MalformedInputException(); |
| } |
| |
| reset(); |
| return 0; |
| } |
| |
| /** |
| * Character conversion |
| */ |
| public int convert(char[] input, int inOff, int inEnd, |
| byte[] output, int outOff, int outEnd) |
| throws UnknownCharacterException, MalformedInputException, |
| ConversionBufferFullException |
| { |
| char inputChar; |
| int inputSize; |
| |
| byteOff = outOff; |
| charOff = inOff; |
| |
| while(charOff < inEnd) { |
| |
| outputByte = workByte; |
| |
| int index; |
| int theBytes; |
| int spaceNeeded; |
| boolean allZeroes = true; |
| int i; |
| |
| |
| if (highHalfZoneCode == 0) { |
| inputChar = input[charOff]; |
| inputSize = 1; |
| } else { |
| inputChar = highHalfZoneCode; |
| inputSize = 0; |
| highHalfZoneCode = 0; |
| } |
| |
| |
| // Is this a high surrogate? |
| if(inputChar >= '\ud800' && inputChar <= '\udbff') { |
| // Is this the last character of the input? |
| if (charOff + inputSize >= inEnd) { |
| highHalfZoneCode = inputChar; |
| charOff += inputSize; |
| break; |
| } |
| |
| // Is there a low surrogate following? |
| inputChar = input[charOff + inputSize]; |
| if (inputChar >= '\udc00' && inputChar <= '\udfff') { |
| |
| // We have a valid surrogate pair. Too bad we don't do |
| // surrogates. Is substitution enabled? |
| if (subMode) { |
| outputByte = subBytes; |
| inputSize++; |
| } else { |
| badInputLength = 2; |
| throw new UnknownCharacterException(); |
| } |
| } else { |
| |
| // We have a malformed surrogate pair |
| badInputLength = 1; |
| throw new MalformedInputException(); |
| } |
| } |
| |
| // Is this an unaccompanied low surrogate? |
| else |
| if (inputChar >= '\uDC00' && inputChar <= '\uDFFF') { |
| badInputLength = 1; |
| throw new MalformedInputException(); |
| } else { |
| |
| String theChars; |
| char aChar; |
| |
| // We have a valid character, get the bytes for it |
| index = index1[((inputChar & mask1) >> shift)] + (inputChar & mask2); |
| |
| if (index < 7500) |
| theChars = index2; |
| else |
| if (index < 15000) { |
| index = index - 7500; |
| theChars = index2a; |
| } |
| else |
| if (index < 22500){ |
| index = index - 15000; |
| theChars = index2b; |
| } |
| else { |
| index = index - 22500; |
| theChars = index2c; |
| } |
| |
| aChar = theChars.charAt(2*index); |
| outputByte[0] = (byte)((aChar & 0xff00)>>8); |
| outputByte[1] = (byte)(aChar & 0x00ff); |
| aChar = theChars.charAt(2*index + 1); |
| outputByte[2] = (byte)((aChar & 0xff00)>>8); |
| outputByte[3] = (byte)(aChar & 0x00ff); |
| } |
| |
| // if there was no mapping - look for substitution characters |
| |
| for (i = 0; i < outputByte.length; i++) { |
| if (outputByte[i] != 0x00) { |
| allZeroes = false; |
| break; |
| } |
| } |
| |
| if (allZeroes && inputChar != '\u0000') |
| { |
| if (subMode) { |
| outputByte = subBytes; |
| } else { |
| badInputLength = 1; |
| throw new UnknownCharacterException(); |
| } |
| } |
| |
| int oindex = 0; |
| for (spaceNeeded = outputByte.length; spaceNeeded > 1; spaceNeeded--){ |
| if (outputByte[oindex++] != 0x00 ) |
| break; |
| } |
| |
| if (byteOff + spaceNeeded > outEnd) |
| throw new ConversionBufferFullException(); |
| |
| |
| for (i = outputByte.length - spaceNeeded; i < outputByte.length; i++) { |
| output[byteOff++] = outputByte[i]; |
| } |
| |
| charOff += inputSize; |
| } |
| |
| return byteOff - outOff; |
| } |
| |
| /** |
| * Resets converter to its initial state. |
| */ |
| public void reset() { |
| charOff = byteOff = 0; |
| highHalfZoneCode = 0; |
| } |
| |
| /** |
| * Returns the maximum number of bytes needed to convert a char. |
| */ |
| public int getMaxBytesPerChar() { |
| return 2; |
| } |
| |
| |
| /** |
| * Returns true if the given character can be converted to the |
| * target character encoding. |
| */ |
| public boolean canConvert(char ch) { |
| int index; |
| String theChars; |
| |
| index = index1[((ch & mask1) >> shift)] + (ch & mask2); |
| |
| if (index < 7500) |
| theChars = index2; |
| else |
| if (index < 15000) { |
| index = index - 7500; |
| theChars = index2a; |
| } |
| else |
| if (index < 22500){ |
| index = index - 15000; |
| theChars = index2b; |
| } |
| else { |
| index = index - 22500; |
| theChars = index2c; |
| } |
| |
| if (theChars.charAt(2*index) != '\u0000' || |
| theChars.charAt(2*index + 1) != '\u0000') |
| return (true); |
| |
| // only return true if input char was unicode null - all others are |
| // undefined |
| return( ch == '\u0000'); |
| |
| } |
| |
| } |