/* * 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; import sun.nio.cs.ext.DoubleByte;import static sun.nio.cs.CharsetMapping.*; public abstract class ByteToCharDBCS_EBCDIC extends ByteToCharConverter{     private static final int SBCS = 0;    private static final int DBCS = 1;     private static final int SO = 0x0e;    private static final int SI = 0x0f;     private int  currentState;    private boolean savedBytePresent;    private int savedByte;     private DoubleByte.Decoder dec;     public ByteToCharDBCS_EBCDIC(DoubleByte.Decoder dec) {       super();       currentState = SBCS;       savedBytePresent = false;       this.dec = dec;    }     char decodeSingle(int b) {        return dec.decodeSingle(b);    }     char decodeDouble(int b1, int b2) {        return dec.decodeDouble(b1, b2);    }     public int flush(char [] output, int outStart, int outEnd)       throws MalformedInputException    {        if (savedBytePresent) {           reset();           badInputLength = 0;           throw new MalformedInputException();       }        reset();       return 0;    }     /**     * Character conversion     */    public int convert(byte[] input, int inOff, int inEnd,                       char[] output, int outOff, int outEnd)        throws UnknownCharacterException, MalformedInputException,               ConversionBufferFullException    {       int  inputSize;       char outputChar = UNMAPPABLE_DECODING;        charOff = outOff;       byteOff = inOff;        while(byteOff < inEnd) {          int byte1, byte2;           if (!savedBytePresent) {            byte1 = input[byteOff] & 0xff;            inputSize = 1;          } else {            byte1 = savedByte;            savedBytePresent = false;            inputSize = 0;          }           if (byte1 == SO) {              // For SO characters - simply validate the state and if OK             //    update the state and go to the next byte              if (currentState != SBCS) {                badInputLength = 1;                throw new MalformedInputException();             } else {                currentState = DBCS;                byteOff += inputSize;             }          }           else             if (byte1 == SI) {                // For SI characters - simply validate the state and if OK                //    update the state and go to the next byte                 if (currentState != DBCS) {                   badInputLength = 1;                   throw new MalformedInputException();                } else {                   currentState = SBCS;                   byteOff+= inputSize;                }             } else {                 // Process the real data characters                 if (currentState == SBCS) {                   outputChar = decodeSingle(byte1);                } else {                    // for a DBCS character - architecture dictates the                   // valid range of 1st bytes                    if (byte1 < 0x40 || byte1 > 0xfe) {                      badInputLength = 1;                      throw new MalformedInputException();                   }                    if (byteOff + inputSize >= inEnd) {                      // We have been split in the middle if a character                      // save the first byte for next time around                       savedByte = byte1;                      savedBytePresent = true;                      byteOff += inputSize;                      break;                   }                    byte2 = input[byteOff+inputSize] & 0xff;                   inputSize++;                    // validate the pair of bytes meet the architecture                    if ((byte1 != 0x40 || byte2 != 0x40) &&                      (byte2 < 0x41 || byte2 > 0xfe)) {                      badInputLength = 2;                      throw new MalformedInputException();                   }                    outputChar = decodeDouble(byte1, byte2);                }                 if (outputChar == UNMAPPABLE_DECODING) {                   if (subMode)                      outputChar = subChars[0];                   else {                      badInputLength = inputSize;                      throw new UnknownCharacterException();                   }                }                 if (charOff >= outEnd)                   throw new ConversionBufferFullException();                 output[charOff++] = outputChar;                byteOff += inputSize;             }        }        return charOff - outOff;    }      /**     *  Resets the converter.     */    public void reset() {       charOff = byteOff = 0;       currentState = SBCS;       savedBytePresent = false;    }}