--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/sun/io/CharToByteSingleByte.java Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,258 @@
+/*
+ * Copyright 1996-2002 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;
+
+/**
+* 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
+*/
+
+public abstract class CharToByteSingleByte extends CharToByteConverter {
+
+ /*
+ * 1st level index, provided by subclass
+ */
+ protected short index1[];
+
+ /*
+ * 2nd level index, provided by subclass
+ */
+ protected String 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 short[] getIndex1() {
+ return index1;
+ }
+
+ public String 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;
+ }
+
+ public byte getNative(char inputChar) {
+ return (byte)index2.charAt(index1[(inputChar & mask1) >> shift]
+ + (inputChar & mask2));
+ }
+
+ /**
+ * 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) {
+ // Look it up in the table
+ if (index2.charAt(index1[((ch & mask1) >> shift)] + (ch & mask2)) != '\u0000')
+ return true;
+
+ // Nulls are always mappable
+ return (ch == '\u0000');
+ }
+}