| /* |
| * 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; |
| } |
| } |