Source Code Cross Referenced for CharsetUTF8.java in  » Internationalization-Localization » icu4j » com » ibm » icu » charset » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Internationalization Localization » icu4j » com.ibm.icu.charset 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /**
002:         *******************************************************************************
003:         * Copyright (C) 2006, International Business Machines Corporation and    *
004:         * others. All Rights Reserved.                                                *
005:         *******************************************************************************
006:         *
007:         *******************************************************************************
008:         */package com.ibm.icu.charset;
009:
010:        import java.nio.ByteBuffer;
011:        import java.nio.CharBuffer;
012:        import java.nio.IntBuffer;
013:        import java.nio.charset.CharsetDecoder;
014:        import java.nio.charset.CharsetEncoder;
015:        import java.nio.charset.CoderResult;
016:
017:        import com.ibm.icu.lang.UCharacter;
018:        import com.ibm.icu.text.UTF16;
019:
020:        /**
021:         * @author Niti Hantaweepant
022:         */
023:        class CharsetUTF8 extends CharsetICU {
024:
025:            protected byte[] fromUSubstitution = new byte[] { (byte) 0xef,
026:                    (byte) 0xbf, (byte) 0xbd };
027:
028:            public CharsetUTF8(String icuCanonicalName,
029:                    String javaCanonicalName, String[] aliases) {
030:                super (icuCanonicalName, javaCanonicalName, aliases);
031:                maxBytesPerChar = 4;
032:                minBytesPerChar = 1;
033:                maxCharsPerByte = 1;
034:            }
035:
036:            /* UTF-8 Conversion DATA
037:             *   for more information see Unicode Strandard 2.0 , Transformation Formats Appendix A-9
038:             */
039:            private static final long OFFSETS_FROM_UTF8[] = { 0, 0x00000000L,
040:                    0x00003080L, 0x000E2080L, 0x03C82080L, 0xFA082080L,
041:                    0x82082080L };
042:
043:            private static final byte BYTES_FROM_UTF8[] = { 1, 1, 1, 1, 1, 1,
044:                    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
045:                    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
046:                    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
047:                    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
048:                    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
049:                    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
050:                    1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
051:                    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
052:                    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
053:                    0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
054:                    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3,
055:                    3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4,
056:                    4, 4, 5, 5, 5, 5, 6, 6, 0, 0 };
057:
058:            /*
059:             * Starting with Unicode 3.0.1:
060:             * UTF-8 byte sequences of length N _must_ encode code points of or above utf8_minChar32[N];
061:             * byte sequences with more than 4 bytes are illegal in UTF-8,
062:             * which is tested with impossible values for them
063:             */
064:            private static final long UTF8_MIN_CHAR32[] = { 0L, 0L, 0x80L,
065:                    0x800L, 0x10000L, 0xffffffffL, 0xffffffffL };
066:
067:            class CharsetDecoderUTF8 extends CharsetDecoderICU {
068:
069:                public CharsetDecoderUTF8(CharsetICU cs) {
070:                    super (cs);
071:                }
072:
073:                protected CoderResult decodeLoop(ByteBuffer source,
074:                        CharBuffer target, IntBuffer offsets, boolean flush) {
075:                    CoderResult cr = CoderResult.UNDERFLOW;
076:
077:                    int sourceArrayIndex = source.position();
078:
079:                    // Todo: CESU8 implementation
080:                    // boolean isCESU8 = args.converter.sharedData == _CESU8Data;
081:                    boolean isCESU8 = (UConverterSharedData._CESU8Data != null);
082:                    int ch, ch2 = 0;
083:                    int i, inBytes;
084:
085:                    donefornow: {
086:                        if (toUnicodeStatus != 0 && target.hasRemaining()) {
087:                            inBytes = mode; /* restore # of bytes to consume */
088:                            i = toULength; /* restore # of bytes consumed */
089:
090:                            ch = toUnicodeStatus; /*Stores the previously calculated ch from a previous call*/
091:                            toUnicodeStatus = 0;
092:
093:                            while (i < inBytes) {
094:                                if (sourceArrayIndex < source.limit()) {
095:                                    toUBytesArray[i] = (byte) (ch2 = source
096:                                            .get(sourceArrayIndex)
097:                                            & UConverterConstants.UNSIGNED_BYTE_MASK);
098:                                    if (!isTrail((byte) ch2)) {
099:                                        break; /* i < inBytes */
100:                                    }
101:                                    ch = (ch << 6) + ch2;
102:                                    ++sourceArrayIndex;
103:                                    i++;
104:                                } else {
105:                                    /* stores a partially calculated target*/
106:                                    toUnicodeStatus = ch;
107:                                    mode = inBytes;
108:                                    toULength = (byte) i;
109:                                    break donefornow;
110:                                }
111:                            }
112:
113:                            /* Remove the accumulated high bits */
114:                            ch -= OFFSETS_FROM_UTF8[inBytes];
115:
116:                            /*
117:                             * Legal UTF-8 byte sequences in Unicode 3.0.1 and up:
118:                             * - use only trail bytes after a lead byte (checked above)
119:                             * - use the right number of trail bytes for a given lead byte
120:                             * - encode a code point <= U+10ffff
121:                             * - use the fewest possible number of bytes for their code points
122:                             * - use at most 4 bytes (for i>=5 it is 0x10ffff<utf8_minChar32[])
123:                             *
124:                             * Starting with Unicode 3.2, surrogate code points must not be encoded in UTF-8.
125:                             * There are no irregular sequences any more.
126:                             * In CESU-8, only surrogates, not supplementary code points, are encoded directly.
127:                             */
128:                            if (i == inBytes
129:                                    && ch <= UConverterSharedData.MAXIMUM_UTF
130:                                    && ch >= UTF8_MIN_CHAR32[i]
131:                                    && (isCESU8 ? i <= 3 : !UTF16
132:                                            .isSurrogate((char) ch))) {
133:                                /* Normal valid byte when the loop has not prematurely terminated (i < inBytes) */
134:                                toULength = 0;
135:                                if (ch <= UConverterSharedData.MAXIMUM_UCS2) {
136:                                    /* fits in 16 bits */
137:                                    target.put((char) ch);
138:                                } else {
139:                                    /* write out the surrogates */
140:                                    ch -= UConverterSharedData.HALF_BASE;
141:                                    target
142:                                            .put((char) ((ch >> UConverterSharedData.HALF_SHIFT) + UConverterSharedData.SURROGATE_HIGH_START));
143:                                    ch = (ch & UConverterSharedData.HALF_MASK)
144:                                            + UConverterSharedData.SURROGATE_LOW_START;
145:                                    if (target.hasRemaining()) {
146:                                        target.put((char) ch);
147:
148:                                    } else /* targetCapacity==1 */{
149:                                        charErrorBufferArray[charErrorBufferBegin + 0] = (char) ch;
150:                                        charErrorBufferLength = 1;
151:                                        cr = CoderResult.OVERFLOW;
152:
153:                                    }
154:                                }
155:                            } else {
156:                                toULength = (byte) i;
157:                                cr = CoderResult
158:                                        .malformedForLength(sourceArrayIndex);
159:                                break donefornow;
160:                            }
161:                        }
162:
163:                        while (sourceArrayIndex < source.limit()
164:                                && target.hasRemaining()) {
165:                            ch = source.get(sourceArrayIndex++)
166:                                    & UConverterConstants.UNSIGNED_BYTE_MASK;
167:                            if (ch < 0x80) /* Simple case */
168:                            {
169:                                target.put((char) ch);
170:                            } else {
171:                                /* store the first char */
172:                                toUBytesArray[0] = (byte) ch;
173:                                inBytes = BYTES_FROM_UTF8[(int) ch]; /* lookup current sequence length */
174:                                i = 1;
175:
176:                                while (i < inBytes) {
177:                                    if (sourceArrayIndex < source.limit()) {
178:                                        toUBytesArray[i] = (byte) (ch2 = source
179:                                                .get(sourceArrayIndex)
180:                                                & UConverterConstants.UNSIGNED_BYTE_MASK);
181:                                        if (!isTrail((byte) ch2)) {
182:                                            break; /* i < inBytes */
183:                                        }
184:                                        ch = (ch << 6) + ch2;
185:                                        ++sourceArrayIndex;
186:                                        i++;
187:                                    } else {
188:                                        /* stores a partially calculated target*/
189:                                        toUnicodeStatus = ch;
190:                                        mode = inBytes;
191:                                        toULength = (byte) i;
192:                                        break donefornow;
193:                                    }
194:                                }
195:
196:                                /* Remove the accumulated high bits */
197:                                ch -= OFFSETS_FROM_UTF8[inBytes];
198:
199:                                /*
200:                                 * Legal UTF-8 byte sequences in Unicode 3.0.1 and up:
201:                                 * - use only trail bytes after a lead byte (checked above)
202:                                 * - use the right number of trail bytes for a given lead byte
203:                                 * - encode a code point <= U+10ffff
204:                                 * - use the fewest possible number of bytes for their code points
205:                                 * - use at most 4 bytes (for i>=5 it is 0x10ffff<utf8_minChar32[])
206:                                 *
207:                                 * Starting with Unicode 3.2, surrogate code points must not be encoded in UTF-8.
208:                                 * There are no irregular sequences any more.
209:                                 * In CESU-8, only surrogates, not supplementary code points, are encoded directly.
210:                                 */
211:                                if (i == inBytes
212:                                        && ch <= UConverterSharedData.MAXIMUM_UTF
213:                                        && ch >= UTF8_MIN_CHAR32[i]
214:                                        && (isCESU8 ? i <= 3 : !UTF16
215:                                                .isSurrogate((char) ch))) {
216:                                    /* Normal valid byte when the loop has not prematurely terminated (i < inBytes) */
217:                                    toULength = 0;
218:                                    if (ch <= UConverterSharedData.MAXIMUM_UCS2) {
219:                                        /* fits in 16 bits */
220:                                        target.put((char) ch);
221:                                    } else {
222:                                        /* write out the surrogates */
223:                                        ch -= UConverterSharedData.HALF_BASE;
224:                                        target
225:                                                .put((char) ((ch >>> UConverterSharedData.HALF_SHIFT) + UConverterSharedData.SURROGATE_HIGH_START));
226:                                        ch = (ch & UConverterSharedData.HALF_MASK)
227:                                                + UConverterSharedData.SURROGATE_LOW_START;
228:                                        if (target.hasRemaining()) {
229:                                            target.put((char) ch);
230:                                        } else {
231:                                            /* Put in overflow buffer (not handled here) */
232:                                            charErrorBufferArray[charErrorBufferBegin + 0] = (char) ch;
233:                                            charErrorBufferLength = 1;
234:                                            cr = CoderResult.OVERFLOW;
235:                                            break;
236:                                        }
237:                                    }
238:                                } else {
239:                                    toULength = (byte) i;
240:                                    cr = CoderResult
241:                                            .malformedForLength(sourceArrayIndex);
242:                                    break;
243:                                }
244:                            }
245:                        }
246:                    }
247:
248:                    if (sourceArrayIndex < source.limit()
249:                            && !target.hasRemaining()) {
250:                        /* End of target buffer */
251:                        cr = CoderResult.OVERFLOW;
252:                    }
253:
254:                    source.position(sourceArrayIndex);
255:
256:                    return cr;
257:                }
258:
259:            }
260:
261:            class CharsetEncoderUTF8 extends CharsetEncoderICU {
262:
263:                public CharsetEncoderUTF8(CharsetICU cs) {
264:                    super (cs, fromUSubstitution);
265:                    implReset();
266:                }
267:
268:                protected void implReset() {
269:                    super .implReset();
270:                }
271:
272:                protected CoderResult encodeLoop(CharBuffer source,
273:                        ByteBuffer target, IntBuffer offsets, boolean flush) {
274:                    CoderResult cr = CoderResult.UNDERFLOW;
275:
276:                    int sourceArrayIndex = source.position();
277:
278:                    // Todo: CESU8 implementation
279:                    // boolean isCESU8 = args.converter.sharedData == _CESU8Data;
280:                    boolean isCESU8 = (UConverterSharedData._CESU8Data != null);
281:
282:                    int ch;
283:                    short indexToWrite;
284:                    byte temp[] = new byte[4];
285:                    boolean doloop = true;
286:
287:                    if (fromUChar32 != 0 && target.hasRemaining()) {
288:                        ch = fromUChar32;
289:                        fromUChar32 = 0;
290:
291:                        if (sourceArrayIndex < source.limit()) {
292:                            /* test the following code unit */
293:                            char trail = source.get(sourceArrayIndex);
294:                            if (UTF16.isTrailSurrogate(trail)) {
295:                                ++sourceArrayIndex;
296:                                ch = UCharacter.getCodePoint((char) ch, trail);
297:                                /* convert this supplementary code point */
298:                                /* exit this condition tree */
299:                            } else {
300:                                /* this is an unmatched lead code unit (1st surrogate) */
301:                                /* callback(illegal) */
302:                                fromUChar32 = (int) ch;
303:                                cr = CoderResult
304:                                        .malformedForLength(sourceArrayIndex);
305:                                doloop = false;
306:                            }
307:                        } else {
308:                            /* no more input */
309:                            fromUChar32 = (int) ch;
310:                            doloop = false;
311:                        }
312:
313:                        if (ch < UTF16.SUPPLEMENTARY_MIN_VALUE) {
314:                            indexToWrite = 2;
315:                            temp[2] = (byte) ((ch >>> 12) | 0xe0);
316:                        } else {
317:                            indexToWrite = 3;
318:                            temp[3] = (byte) ((ch >>> 18) | 0xf0);
319:                            temp[2] = (byte) (((ch >>> 12) & 0x3f) | 0x80);
320:                        }
321:                        temp[1] = (byte) (((ch >>> 6) & 0x3f) | 0x80);
322:                        temp[0] = (byte) ((ch & 0x3f) | 0x80);
323:
324:                        for (; indexToWrite >= 0; indexToWrite--) {
325:                            if (target.hasRemaining()) {
326:                                target.put(temp[indexToWrite]);
327:                            } else {
328:                                errorBuffer[errorBufferLength++] = temp[indexToWrite];
329:                                cr = CoderResult.OVERFLOW;
330:                            }
331:                        }
332:                    }
333:
334:                    if (doloop) {
335:                        while (sourceArrayIndex < source.limit()
336:                                && target.hasRemaining()) {
337:                            ch = source.get(sourceArrayIndex++);
338:                            if (ch < 0x80) { /* Single byte */
339:                                target.put((byte) ch);
340:                            } else if (ch < 0x800) { /* Double byte */
341:                                target.put((byte) ((ch >>> 6) | 0xc0));
342:                                if (target.hasRemaining()) {
343:                                    target.put((byte) ((ch & 0x3f) | 0x80));
344:                                } else {
345:                                    errorBuffer[0] = (byte) ((ch & 0x3f) | 0x80);
346:                                    errorBufferLength = 1;
347:                                    cr = CoderResult.OVERFLOW;
348:                                    break;
349:                                }
350:                            } else { /* Check for surrogates */
351:                                if (UTF16.isSurrogate((char) ch) && !isCESU8) {
352:                                    if (UTF16.isLeadSurrogate((char) ch)) {
353:
354:                                        if (sourceArrayIndex < source.limit()) {
355:                                            /* test the following code unit */
356:                                            char trail = source
357:                                                    .get(sourceArrayIndex);
358:                                            if (UTF16.isTrailSurrogate(trail)) {
359:                                                ++sourceArrayIndex;
360:                                                ch = UCharacter.getCodePoint(
361:                                                        (char) ch, trail);
362:                                                //ch2 = 0;
363:                                                /* convert this supplementary code point */
364:                                                /* exit this condition tree */
365:                                            } else {
366:                                                /* this is an unmatched lead code unit (1st surrogate) */
367:                                                /* callback(illegal) */
368:                                                fromUChar32 = ch;
369:                                                cr = CoderResult
370:                                                        .malformedForLength(sourceArrayIndex);
371:                                                break;
372:                                            }
373:                                        } else {
374:                                            /* no more input */
375:                                            fromUChar32 = ch;
376:                                            break;
377:                                        }
378:                                    } else {
379:                                        fromUChar32 = (int) ch;
380:                                        cr = CoderResult
381:                                                .malformedForLength(sourceArrayIndex);
382:                                        break;
383:                                    }
384:                                }
385:
386:                                if (ch < UTF16.SUPPLEMENTARY_MIN_VALUE) {
387:                                    indexToWrite = 2;
388:                                    temp[2] = (byte) ((ch >>> 12) | 0xe0);
389:                                } else {
390:                                    indexToWrite = 3;
391:                                    temp[3] = (byte) ((ch >>> 18) | 0xf0);
392:                                    temp[2] = (byte) (((ch >>> 12) & 0x3f) | 0x80);
393:                                }
394:                                temp[1] = (byte) (((ch >>> 6) & 0x3f) | 0x80);
395:                                temp[0] = (byte) ((ch & 0x3f) | 0x80);
396:
397:                                for (; indexToWrite >= 0; indexToWrite--) {
398:                                    if (target.hasRemaining()) {
399:                                        target.put(temp[indexToWrite]);
400:                                    } else {
401:                                        errorBuffer[errorBufferLength++] = temp[indexToWrite];
402:                                        cr = CoderResult.OVERFLOW;
403:                                    }
404:                                }
405:                            }
406:                        }
407:                    }
408:
409:                    if (sourceArrayIndex < source.limit()
410:                            && !target.hasRemaining()) {
411:                        cr = CoderResult.OVERFLOW;
412:                    }
413:
414:                    source.position(sourceArrayIndex);
415:
416:                    return cr;
417:                }
418:            }
419:
420:            /* single-code point definitions -------------------------------------------- */
421:
422:            /*
423:             * Does this code unit (byte) encode a code point by itself (US-ASCII 0..0x7f)?
424:             * @param c 8-bit code unit (byte)
425:             * @return TRUE or FALSE
426:             * @draft ICU 3.6
427:             */
428:            //static final boolean isSingle(byte c) {return (((c)&0x80)==0);}
429:            /*
430:             * Is this code unit (byte) a UTF-8 lead byte?
431:             * @param c 8-bit code unit (byte)
432:             * @return TRUE or FALSE
433:             * @draft ICU 3.6
434:             */
435:            //static final boolean isLead(byte c) {return ((((c)-0xc0) & UConverterConstants.UNSIGNED_BYTE_MASK)<0x3e);}
436:            /**
437:             * Is this code unit (byte) a UTF-8 trail byte?
438:             * @param c 8-bit code unit (byte)
439:             * @return TRUE or FALSE
440:             * @draft ICU 3.6
441:             */
442:            static final boolean isTrail(byte c) {
443:                return (((c) & 0xc0) == 0x80);
444:            }
445:
446:            /*
447:             * How many code units (bytes) are used for the UTF-8 encoding
448:             * of this Unicode code point?
449:             * @param c 32-bit code point
450:             * @return 1..4, or 0 if c is a surrogate or not a Unicode code point
451:             * @draft ICU 3.6
452:             */
453:            /*static final int length(int c)
454:            {
455:            	long uc = c & UConverterConstants.UNSIGNED_INT_MASK;
456:            	return
457:                (uc<=0x7f ? 1 : 
458:                    (uc<=0x7ff ? 2 : 
459:                        (uc<=0xd7ff ? 3 : 
460:                            (uc<=0xdfff || uc>0x10ffff ? 0 : 
461:                                (uc<=0xffff ? 3 : 4)
462:                            ) 
463:                        ) 
464:                    ) 
465:                );
466:            }*/
467:
468:            public CharsetDecoder newDecoder() {
469:                return new CharsetDecoderUTF8(this );
470:            }
471:
472:            public CharsetEncoder newEncoder() {
473:                return new CharsetEncoderUTF8(this);
474:            }
475:        }
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