Source Code Cross Referenced for CharToByteDBCS_EBCDIC.java in  » 6.0-JDK-Modules » j2me » sun » io » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » sun.io 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * @(#)CharToByteDBCS_EBCDIC.java	1.11 06/10/10
003:         *
004:         * Copyright  1990-2006 Sun Microsystems, Inc. All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006:         * 
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License version
009:         * 2 only, as published by the Free Software Foundation. 
010:         * 
011:         * This program is distributed in the hope that it will be useful, but
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014:         * General Public License version 2 for more details (a copy is
015:         * included at /legal/license.txt). 
016:         * 
017:         * You should have received a copy of the GNU General Public License
018:         * version 2 along with this work; if not, write to the Free Software
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA 
021:         * 
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023:         * Clara, CA 95054 or visit www.sun.com if you need additional
024:         * information or have any questions. 
025:         *
026:         */
027:        package sun.io;
028:
029:        public abstract class CharToByteDBCS_EBCDIC extends CharToByteConverter {
030:            private static final int SBCS = 0;
031:            private static final int DBCS = 1;
032:            private static final byte SO = 0x0e;
033:            private static final byte SI = 0x0f;
034:            private int currentState;
035:            private char highHalfZoneCode;
036:            private byte[] outputByte = new byte[2];
037:            protected short index1[];
038:            protected String index2;
039:            protected String index2a;
040:            protected int mask1;
041:            protected int mask2;
042:            protected int shift;
043:
044:            public CharToByteDBCS_EBCDIC() {
045:                super ();
046:                highHalfZoneCode = 0;
047:                currentState = SBCS;
048:            }
049:
050:            /**
051:             * flush out any residual data and reset the buffer state
052:             */
053:            public int flush(byte[] output, int outStart, int outEnd)
054:                    throws MalformedInputException,
055:                    ConversionBufferFullException {
056:                int bytesOut = 0;
057:                if (highHalfZoneCode != 0) {
058:                    reset();
059:                    badInputLength = 0;
060:                    throw new MalformedInputException();
061:                }
062:                if (currentState == DBCS) {
063:                    if (outStart >= outEnd)
064:                        throw new ConversionBufferFullException();
065:                    output[outStart] = SI;
066:                    bytesOut++;
067:                }
068:                reset();
069:                return bytesOut;
070:            }
071:
072:            /**
073:             * Character conversion
074:             */
075:            public int convert(char[] input, int inOff, int inEnd,
076:                    byte[] output, int outOff, int outEnd)
077:                    throws UnknownCharacterException, MalformedInputException,
078:                    ConversionBufferFullException {
079:                char inputChar;
080:                int inputSize;
081:                byteOff = outOff;
082:                charOff = inOff;
083:                while (charOff < inEnd) {
084:                    int index;
085:                    int theBytes;
086:                    int spaceNeeded;
087:                    if (highHalfZoneCode == 0) {
088:                        inputChar = input[charOff];
089:                        inputSize = 1;
090:                    } else {
091:                        inputChar = highHalfZoneCode;
092:                        inputSize = 0;
093:                        highHalfZoneCode = 0;
094:                    }
095:                    // Is this a high surrogate?
096:                    if (inputChar >= '\ud800' && inputChar <= '\udbff') {
097:                        // Is this the last character of the input?
098:                        if (charOff + inputSize >= inEnd) {
099:                            highHalfZoneCode = inputChar;
100:                            charOff += inputSize;
101:                            break;
102:                        }
103:                        // Is there a low surrogate following?
104:                        inputChar = input[charOff + inputSize];
105:                        if (inputChar >= '\udc00' && inputChar <= '\udfff') {
106:                            // We have a valid surrogate pair.  Too bad we don't do
107:                            // surrogates.  Is substitution enabled?
108:                            if (subMode) {
109:                                if (subBytes.length == 1) {
110:                                    outputByte[0] = 0x00;
111:                                    outputByte[1] = subBytes[0];
112:                                } else {
113:                                    outputByte[0] = subBytes[0];
114:                                    outputByte[1] = subBytes[1];
115:                                }
116:                                inputSize++;
117:                            } else {
118:                                badInputLength = 2;
119:                                throw new UnknownCharacterException();
120:                            }
121:                        } else {
122:                            // We have a malformed surrogate pair
123:                            badInputLength = 1;
124:                            throw new MalformedInputException();
125:                        }
126:                    } // Is this an unaccompanied low surrogate?
127:                    else if (inputChar >= '\uDC00' && inputChar <= '\uDFFF') {
128:                        badInputLength = 1;
129:                        throw new MalformedInputException();
130:                    } else {
131:                        // We have a valid character, get the bytes for it
132:                        index = index1[((inputChar & mask1) >> shift)]
133:                                + (inputChar & mask2);
134:                        if (index < 15000)
135:                            theBytes = (int) (index2.charAt(index));
136:                        else
137:                            theBytes = (int) (index2a.charAt(index - 15000));
138:                        outputByte[0] = (byte) ((theBytes & 0x0000ff00) >> 8);
139:                        outputByte[1] = (byte) (theBytes & 0x000000ff);
140:                    }
141:                    // if there was no mapping - look for substitution characters
142:                    if (outputByte[0] == 0x00 && outputByte[1] == 0x00
143:                            && inputChar != '\u0000') {
144:                        if (subMode) {
145:                            if (subBytes.length == 1) {
146:                                outputByte[0] = 0x00;
147:                                outputByte[1] = subBytes[0];
148:                            } else {
149:                                outputByte[0] = subBytes[0];
150:                                outputByte[1] = subBytes[1];
151:                            }
152:                        } else {
153:                            badInputLength = 1;
154:                            throw new UnknownCharacterException();
155:                        }
156:                    }
157:                    //Set the output buffer into the correct state
158:
159:                    if (currentState == DBCS && outputByte[0] == 0x00) {
160:                        if (byteOff >= outEnd)
161:                            throw new ConversionBufferFullException();
162:                        currentState = SBCS;
163:                        output[byteOff++] = SI;
164:                    } else if (currentState == SBCS && outputByte[0] != 0x00) {
165:                        if (byteOff >= outEnd)
166:                            throw new ConversionBufferFullException();
167:                        currentState = DBCS;
168:                        output[byteOff++] = SO;
169:                    }
170:                    if (currentState == DBCS)
171:                        spaceNeeded = 2;
172:                    else
173:                        spaceNeeded = 1;
174:                    if (byteOff + spaceNeeded > outEnd)
175:                        throw new ConversionBufferFullException();
176:                    if (currentState == SBCS)
177:                        output[byteOff++] = outputByte[1];
178:                    else {
179:                        output[byteOff++] = outputByte[0];
180:                        output[byteOff++] = outputByte[1];
181:                    }
182:                    charOff += inputSize;
183:                }
184:                return byteOff - outOff;
185:            }
186:
187:            /**
188:             * Resets converter to its initial state.
189:             */
190:            public void reset() {
191:                charOff = byteOff = 0;
192:                highHalfZoneCode = 0;
193:                currentState = SBCS;
194:            }
195:
196:            /**
197:             * Returns the maximum number of bytes needed to convert a char.
198:             */
199:            public int getMaxBytesPerChar() {
200:                return 3;
201:            }
202:
203:            /**
204:             * Sets the substitution bytes to use when the converter is in
205:             * substitution mode.  The given bytes should represent a valid
206:             * character in the target character encoding.
207:             */
208:
209:            public void setSubstitutionBytes(byte[] newSubBytes)
210:                    throws IllegalArgumentException {
211:                if (newSubBytes.length > 2 || newSubBytes.length == 0) {
212:                    throw new IllegalArgumentException();
213:                }
214:                subBytes = new byte[newSubBytes.length];
215:                System.arraycopy(newSubBytes, 0, subBytes, 0,
216:                        newSubBytes.length);
217:            }
218:
219:            /**
220:             * Returns true if the given character can be converted to the
221:             * target character encoding.
222:             */
223:            public boolean canConvert(char ch) {
224:                int index;
225:                int theBytes;
226:                index = index1[((ch & mask1) >> shift)] + (ch & mask2);
227:                if (index < 15000)
228:                    theBytes = (int) (index2.charAt(index));
229:                else
230:                    theBytes = (int) (index2a.charAt(index - 15000));
231:                if (theBytes != 0)
232:                    return (true);
233:                // only return true if input char was unicode null - all others are
234:                //     undefined
235:                return (ch == '\u0000');
236:            }
237:        }
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