| /* |
| * Copyright (c) 1997, 2002, 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; |
| |
| /** |
| * @author Limin Shi |
| */ |
| |
| public abstract class CharToByteDoubleByte extends CharToByteConverter { |
| |
| /* |
| * 1st level index, provided by subclass |
| */ |
| protected short index1[]; |
| |
| /* |
| * 2nd level index, provided by subclass |
| */ |
| protected String index2[]; |
| |
| protected char highHalfZoneCode; |
| |
| public short[] getIndex1() { |
| return index1; |
| } |
| |
| public String[] getIndex2() { |
| return index2; |
| } |
| |
| public int flush(byte[] output, int outStart, int outEnd) |
| throws MalformedInputException, ConversionBufferFullException |
| { |
| if (highHalfZoneCode != 0) { |
| highHalfZoneCode = 0; |
| badInputLength = 0; |
| throw new MalformedInputException(); |
| } |
| byteOff = charOff = 0; |
| return 0; |
| } |
| |
| /** |
| * Converts characters to sequences of bytes. |
| * Conversions that result in Exceptions can be restarted by calling |
| * convert again, with appropriately modified parameters. |
| * @return the characters written to output. |
| * @param input char array containing text in Unicode |
| * @param inStart offset in input array |
| * @param inEnd offset of last byte to be converted |
| * @param output byte array to receive conversion result |
| * @param outStart starting offset |
| * @param outEnd offset of last byte to be written to |
| * @throw UnsupportedCharacterException for any character |
| * that cannot be converted to the external character set. |
| */ |
| public int convert(char[] input, int inOff, int inEnd, |
| byte[] output, int outOff, int outEnd) |
| throws MalformedInputException, UnknownCharacterException, |
| ConversionBufferFullException |
| { |
| char inputChar; // Input character to be converted |
| byte[] outputByte; // Output byte written to output |
| int inputSize = 0; // Size of input |
| int outputSize = 0; // Size of output |
| byte[] tmpbuf = new byte[2]; |
| |
| // Record beginning offsets |
| charOff = inOff; |
| byteOff = outOff; |
| |
| if (highHalfZoneCode != 0) { |
| inputChar = highHalfZoneCode; |
| highHalfZoneCode = 0; |
| if (input[inOff] >= 0xdc00 && input[inOff] <= 0xdfff) { |
| // This is legal UTF16 sequence. |
| badInputLength = 1; |
| throw new UnknownCharacterException(); |
| } else { |
| // This is illegal UTF16 sequence. |
| badInputLength = 0; |
| throw new MalformedInputException(); |
| } |
| } |
| |
| // Loop until we hit the end of the input |
| while(charOff < inEnd) { |
| inputSize = 1; |
| outputByte = tmpbuf; |
| inputChar = input[charOff]; // Get the input character |
| |
| // Is this a high surrogate? |
| if(inputChar >= '\uD800' && inputChar <= '\uDBFF') { |
| // Is this the last character of the input? |
| if (charOff + 1 >= inEnd) { |
| highHalfZoneCode = inputChar; |
| break; |
| } |
| |
| // Is there a low surrogate following? |
| inputChar = input[charOff + 1]; |
| 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; |
| outputSize = subBytes.length; |
| inputSize = 2; |
| } 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 { |
| outputSize = convSingleByte(inputChar, outputByte); |
| if (outputSize == 0) { // DoubleByte |
| int ncode = getNative(inputChar); |
| if (ncode != 0 ) { |
| outputByte[0] = (byte) ((ncode & 0xff00) >> 8); |
| outputByte[1] = (byte) (ncode & 0xff); |
| outputSize = 2; |
| } else { |
| if (subMode) { |
| outputByte = subBytes; |
| outputSize = subBytes.length; |
| } else { |
| badInputLength = 1; |
| throw new UnknownCharacterException(); |
| } |
| } |
| } |
| } |
| |
| // If we don't have room for the output, throw an exception |
| if (byteOff + outputSize > outEnd) |
| throw new ConversionBufferFullException(); |
| |
| // Put the byte in the output buffer |
| for (int i = 0; i < outputSize; i++) { |
| output[byteOff++] = outputByte[i]; |
| } |
| charOff += inputSize; |
| } |
| // Return the length written to the output buffer |
| return byteOff - outOff; |
| } |
| |
| |
| /** |
| * the maximum number of bytes needed to hold a converted char |
| * @returns the maximum number of bytes needed for a converted char |
| */ |
| public int getMaxBytesPerChar() { |
| return 2; |
| } |
| |
| /** |
| * Resets the converter. |
| * Call this method to reset the converter to its initial state |
| */ |
| public void reset() { |
| byteOff = charOff = 0; |
| highHalfZoneCode = 0; |
| } |
| |
| /** |
| * Return whether a character is mappable or not |
| * @return true if a character is mappable |
| */ |
| public boolean canConvert(char ch) { |
| byte[] outByte = new byte[2]; |
| |
| if ((ch == (char) 0) || (convSingleByte(ch, outByte) != 0)) |
| return true; |
| if (this.getNative(ch) != 0) |
| return true; |
| return false; |
| } |
| |
| |
| /* |
| * Can be changed by subclass |
| */ |
| protected int convSingleByte(char inputChar, byte[] outputByte) { |
| if (inputChar < 0x80) { |
| outputByte[0] = (byte)(inputChar & 0x7f); |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* |
| * Can be changed by subclass |
| */ |
| protected int getNative(char ch) { |
| int offset = index1[((ch & 0xff00) >> 8 )] << 8; |
| return index2[offset >> 12].charAt((offset & 0xfff) + (ch & 0xff)); |
| } |
| |
| } |