| /* |
| * Copyright (c) 1996, 2008, 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; |
| |
| import static sun.nio.cs.CharsetMapping.*; |
| |
| /** |
| * A table driven conversion from char to byte for single byte |
| * character sets. Tables will reside in the class CharToByteYYYYY, |
| * where YYYYY is a unique character set identifier |
| |
| < TBD: Tables are of the form... > |
| |
| * |
| * @author Lloyd Honomichl |
| * @author Asmus Freytag |
| * @version 8/28/96 |
| */ |
| |
| public abstract class CharToByteSingleByte extends CharToByteConverter { |
| |
| /* |
| * 1st level index, provided by subclass |
| */ |
| protected char[] index1; |
| |
| /* |
| * 2nd level index, provided by subclass |
| */ |
| protected char[] index2; |
| |
| /* |
| * Mask to isolate bits for 1st level index, from subclass |
| */ |
| protected int mask1; |
| |
| /* |
| * Mask to isolate bits for 2nd level index, from subclass |
| */ |
| protected int mask2; |
| |
| /* |
| * Shift to isolate bits for 1st level index, from subclass |
| */ |
| protected int shift; |
| |
| private char highHalfZoneCode; |
| |
| public char[] getIndex1() { |
| return index1; |
| } |
| |
| public char[] getIndex2() { |
| return index2; |
| } |
| public int flush(byte[] output, int outStart, int outEnd) |
| throws MalformedInputException |
| { |
| 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 MalformedInputException for any sequence of chars that is |
| * illegal in Unicode (principally unpaired surrogates |
| * and \uFFFF or \uFFFE), including any partial surrogate pair |
| * which occurs at the end of an input buffer. |
| * @throw UnsupportedCharacterException for any character that |
| * 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; // Size of input |
| int outputSize; // Size of output |
| |
| byte[] tmpArray = new byte[1]; |
| |
| // 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) { |
| |
| outputByte = tmpArray; |
| |
| // Get the input character |
| inputChar = input[charOff]; |
| |
| // Default output size |
| outputSize = 1; |
| |
| // Assume this is a simple character |
| inputSize = 1; |
| |
| // Is this a high surrogate? |
| if(inputChar >= '\uD800' && inputChar <= '\uDBFF') { |
| // Is this the last character in 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 map |
| // 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(); |
| } |
| |
| // Not part of a surrogate, so look it up |
| else { |
| // Get output using two level lookup |
| outputByte[0] = getNative(inputChar); |
| |
| // Might this character be unmappable? |
| if (outputByte[0] == 0) { |
| // If outputByte is zero because the input was zero |
| // then this character is actually mappable |
| if (input[charOff] != '\u0000') { |
| // We have an unmappable character |
| // Is substitution enabled? |
| 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 1; |
| } |
| |
| int encodeChar(char ch) { |
| char index = index1[ch >> 8]; |
| if (index == UNMAPPABLE_ENCODING) |
| return UNMAPPABLE_ENCODING; |
| return index2[index + (ch & 0xff)]; |
| } |
| |
| public byte getNative(char inputChar) { |
| int b = encodeChar(inputChar); |
| if (b == UNMAPPABLE_ENCODING) |
| return 0; |
| return (byte)b; |
| } |
| |
| /** |
| * 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) { |
| return encodeChar(ch) != UNMAPPABLE_ENCODING; |
| } |
| } |