Source Code Cross Referenced for Buffer.java in  » Database-JDBC-Connection-Pool » mysql-connector-java-5.1.3 » com » mysql » jdbc » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database JDBC Connection Pool » mysql connector java 5.1.3 » com.mysql.jdbc 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         Copyright (C) 2002-2005 MySQL AB
003:
004:         This program is free software; you can redistribute it and/or modify
005:         it under the terms of version 2 of the GNU General Public License as 
006:         published by the Free Software Foundation.
007:
008:         There are special exceptions to the terms and conditions of the GPL 
009:         as it is applied to this software. View the full text of the 
010:         exception in file EXCEPTIONS-CONNECTOR-J in the directory of this 
011:         software distribution.
012:
013:         This program is distributed in the hope that it will be useful,
014:         but WITHOUT ANY WARRANTY; without even the implied warranty of
015:         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
016:         GNU General Public License for more details.
017:
018:         You should have received a copy of the GNU General Public License
019:         along with this program; if not, write to the Free Software
020:         Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
021:
022:
023:
024:         */
025:        package com.mysql.jdbc;
026:
027:        import java.io.UnsupportedEncodingException;
028:
029:        import java.nio.ByteBuffer;
030:
031:        import java.sql.SQLException;
032:
033:        /**
034:         * Buffer contains code to read and write packets from/to the MySQL server.
035:         * 
036:         * @version $Id: Buffer.java 6445 2007-06-07 15:25:59Z mmatthews $
037:         * @author Mark Matthews
038:         */
039:        class Buffer {
040:            static final int MAX_BYTES_TO_DUMP = 512;
041:
042:            static final int NO_LENGTH_LIMIT = -1;
043:
044:            static final long NULL_LENGTH = -1;
045:
046:            private int bufLength = 0;
047:
048:            private byte[] byteBuffer;
049:
050:            private int position = 0;
051:
052:            protected boolean wasMultiPacket = false;
053:
054:            Buffer(byte[] buf) {
055:                this .byteBuffer = buf;
056:                setBufLength(buf.length);
057:            }
058:
059:            Buffer(int size) {
060:                this .byteBuffer = new byte[size];
061:                setBufLength(this .byteBuffer.length);
062:                this .position = MysqlIO.HEADER_LENGTH;
063:            }
064:
065:            final void clear() {
066:                this .position = MysqlIO.HEADER_LENGTH;
067:            }
068:
069:            final void dump() {
070:                dump(getBufLength());
071:            }
072:
073:            final String dump(int numBytes) {
074:                return StringUtils.dumpAsHex(getBytes(0,
075:                        numBytes > getBufLength() ? getBufLength() : numBytes),
076:                        numBytes > getBufLength() ? getBufLength() : numBytes);
077:            }
078:
079:            final String dumpClampedBytes(int numBytes) {
080:                int numBytesToDump = numBytes < MAX_BYTES_TO_DUMP ? numBytes
081:                        : MAX_BYTES_TO_DUMP;
082:
083:                String dumped = StringUtils.dumpAsHex(getBytes(0,
084:                        numBytesToDump > getBufLength() ? getBufLength()
085:                                : numBytesToDump),
086:                        numBytesToDump > getBufLength() ? getBufLength()
087:                                : numBytesToDump);
088:
089:                if (numBytesToDump < numBytes) {
090:                    return dumped + " ....(packet exceeds max. dump length)";
091:                }
092:
093:                return dumped;
094:            }
095:
096:            final void dumpHeader() {
097:                for (int i = 0; i < MysqlIO.HEADER_LENGTH; i++) {
098:                    String hexVal = Integer.toHexString(readByte(i) & 0xff);
099:
100:                    if (hexVal.length() == 1) {
101:                        hexVal = "0" + hexVal; //$NON-NLS-1$
102:                    }
103:
104:                    System.out.print(hexVal + " "); //$NON-NLS-1$
105:                }
106:            }
107:
108:            final void dumpNBytes(int start, int nBytes) {
109:                StringBuffer asciiBuf = new StringBuffer();
110:
111:                for (int i = start; (i < (start + nBytes))
112:                        && (i < getBufLength()); i++) {
113:                    String hexVal = Integer.toHexString(readByte(i) & 0xff);
114:
115:                    if (hexVal.length() == 1) {
116:                        hexVal = "0" + hexVal; //$NON-NLS-1$
117:                    }
118:
119:                    System.out.print(hexVal + " "); //$NON-NLS-1$
120:
121:                    if ((readByte(i) > 32) && (readByte(i) < 127)) {
122:                        asciiBuf.append((char) readByte(i));
123:                    } else {
124:                        asciiBuf.append("."); //$NON-NLS-1$
125:                    }
126:
127:                    asciiBuf.append(" "); //$NON-NLS-1$
128:                }
129:
130:                System.out.println("    " + asciiBuf.toString()); //$NON-NLS-1$
131:            }
132:
133:            final void ensureCapacity(int additionalData) throws SQLException {
134:                if ((this .position + additionalData) > getBufLength()) {
135:                    if ((this .position + additionalData) < this .byteBuffer.length) {
136:                        // byteBuffer.length is != getBufLength() all of the time
137:                        // due to re-using of packets (we don't shrink them)
138:                        //
139:                        // If we can, don't re-alloc, just set buffer length
140:                        // to size of current buffer
141:                        setBufLength(this .byteBuffer.length);
142:                    } else {
143:                        //
144:                        // Otherwise, re-size, and pad so we can avoid
145:                        // allocing again in the near future
146:                        //
147:                        int newLength = (int) (this .byteBuffer.length * 1.25);
148:
149:                        if (newLength < (this .byteBuffer.length + additionalData)) {
150:                            newLength = this .byteBuffer.length
151:                                    + (int) (additionalData * 1.25);
152:                        }
153:
154:                        if (newLength < this .byteBuffer.length) {
155:                            newLength = this .byteBuffer.length + additionalData;
156:                        }
157:
158:                        byte[] newBytes = new byte[newLength];
159:
160:                        System.arraycopy(this .byteBuffer, 0, newBytes, 0,
161:                                this .byteBuffer.length);
162:                        this .byteBuffer = newBytes;
163:                        setBufLength(this .byteBuffer.length);
164:                    }
165:                }
166:            }
167:
168:            /**
169:             * Skip over a length-encoded string
170:             * 
171:             * @return The position past the end of the string
172:             */
173:            public int fastSkipLenString() {
174:                long len = this .readFieldLength();
175:
176:                this .position += len;
177:
178:                return (int) len;
179:            }
180:
181:            public void fastSkipLenByteArray() {
182:                long len = this .readFieldLength();
183:
184:                if (len == NULL_LENGTH || len == 0) {
185:                    return;
186:                }
187:
188:                this .position += len;
189:            }
190:
191:            protected final byte[] getBufferSource() {
192:                return this .byteBuffer;
193:            }
194:
195:            int getBufLength() {
196:                return this .bufLength;
197:            }
198:
199:            /**
200:             * Returns the array of bytes this Buffer is using to read from.
201:             * 
202:             * @return byte array being read from
203:             */
204:            public byte[] getByteBuffer() {
205:                return this .byteBuffer;
206:            }
207:
208:            final byte[] getBytes(int len) {
209:                byte[] b = new byte[len];
210:                System.arraycopy(this .byteBuffer, this .position, b, 0, len);
211:                this .position += len; // update cursor
212:
213:                return b;
214:            }
215:
216:            /*
217:             * (non-Javadoc)
218:             * 
219:             * @see com.mysql.jdbc.Buffer#getBytes(int, int)
220:             */
221:            byte[] getBytes(int offset, int len) {
222:                byte[] dest = new byte[len];
223:                System.arraycopy(this .byteBuffer, offset, dest, 0, len);
224:
225:                return dest;
226:            }
227:
228:            int getCapacity() {
229:                return this .byteBuffer.length;
230:            }
231:
232:            public ByteBuffer getNioBuffer() {
233:                throw new IllegalArgumentException(Messages
234:                        .getString("ByteArrayBuffer.0")); //$NON-NLS-1$
235:            }
236:
237:            /**
238:             * Returns the current position to write to/ read from
239:             * 
240:             * @return the current position to write to/ read from
241:             */
242:            public int getPosition() {
243:                return this .position;
244:            }
245:
246:            // 2000-06-05 Changed
247:            final boolean isLastDataPacket() {
248:                return ((getBufLength() < 9) && ((this .byteBuffer[0] & 0xff) == 254));
249:            }
250:
251:            final long newReadLength() {
252:                int sw = this .byteBuffer[this .position++] & 0xff;
253:
254:                switch (sw) {
255:                case 251:
256:                    return 0;
257:
258:                case 252:
259:                    return readInt();
260:
261:                case 253:
262:                    return readLongInt();
263:
264:                case 254: // changed for 64 bit lengths
265:                    return readLongLong();
266:
267:                default:
268:                    return sw;
269:                }
270:            }
271:
272:            final byte readByte() {
273:                return this .byteBuffer[this .position++];
274:            }
275:
276:            final byte readByte(int readAt) {
277:                return this .byteBuffer[readAt];
278:            }
279:
280:            final long readFieldLength() {
281:                int sw = this .byteBuffer[this .position++] & 0xff;
282:
283:                switch (sw) {
284:                case 251:
285:                    return NULL_LENGTH;
286:
287:                case 252:
288:                    return readInt();
289:
290:                case 253:
291:                    return readLongInt();
292:
293:                case 254:
294:                    return readLongLong();
295:
296:                default:
297:                    return sw;
298:                }
299:            }
300:
301:            // 2000-06-05 Changed
302:            final int readInt() {
303:                byte[] b = this .byteBuffer; // a little bit optimization
304:
305:                return (b[this .position++] & 0xff)
306:                        | ((b[this .position++] & 0xff) << 8);
307:            }
308:
309:            final int readIntAsLong() {
310:                byte[] b = this .byteBuffer;
311:
312:                return (b[this .position++] & 0xff)
313:                        | ((b[this .position++] & 0xff) << 8)
314:                        | ((b[this .position++] & 0xff) << 16)
315:                        | ((b[this .position++] & 0xff) << 24);
316:            }
317:
318:            final byte[] readLenByteArray(int offset) {
319:                long len = this .readFieldLength();
320:
321:                if (len == NULL_LENGTH) {
322:                    return null;
323:                }
324:
325:                if (len == 0) {
326:                    return Constants.EMPTY_BYTE_ARRAY;
327:                }
328:
329:                this .position += offset;
330:
331:                return getBytes((int) len);
332:            }
333:
334:            final long readLength() {
335:                int sw = this .byteBuffer[this .position++] & 0xff;
336:
337:                switch (sw) {
338:                case 251:
339:                    return 0;
340:
341:                case 252:
342:                    return readInt();
343:
344:                case 253:
345:                    return readLongInt();
346:
347:                case 254:
348:                    return readLong();
349:
350:                default:
351:                    return sw;
352:                }
353:            }
354:
355:            // 2000-06-05 Fixed
356:            final long readLong() {
357:                byte[] b = this .byteBuffer;
358:
359:                return ((long) b[this .position++] & 0xff)
360:                        | (((long) b[this .position++] & 0xff) << 8)
361:                        | ((long) (b[this .position++] & 0xff) << 16)
362:                        | ((long) (b[this .position++] & 0xff) << 24);
363:            }
364:
365:            // 2000-06-05 Changed
366:            final int readLongInt() {
367:                byte[] b = this .byteBuffer;
368:
369:                return (b[this .position++] & 0xff)
370:                        | ((b[this .position++] & 0xff) << 8)
371:                        | ((b[this .position++] & 0xff) << 16);
372:            }
373:
374:            // 2000-06-05 Fixed
375:            final long readLongLong() {
376:                byte[] b = this .byteBuffer;
377:
378:                return (b[this .position++] & 0xff)
379:                        | ((long) (b[this .position++] & 0xff) << 8)
380:                        | ((long) (b[this .position++] & 0xff) << 16)
381:                        | ((long) (b[this .position++] & 0xff) << 24)
382:                        | ((long) (b[this .position++] & 0xff) << 32)
383:                        | ((long) (b[this .position++] & 0xff) << 40)
384:                        | ((long) (b[this .position++] & 0xff) << 48)
385:                        | ((long) (b[this .position++] & 0xff) << 56);
386:            }
387:
388:            final int readnBytes() {
389:                int sw = this .byteBuffer[this .position++] & 0xff;
390:
391:                switch (sw) {
392:                case 1:
393:                    return this .byteBuffer[this .position++] & 0xff;
394:
395:                case 2:
396:                    return this .readInt();
397:
398:                case 3:
399:                    return this .readLongInt();
400:
401:                case 4:
402:                    return (int) this .readLong();
403:
404:                default:
405:                    return 255;
406:                }
407:            }
408:
409:            //
410:            // Read a null-terminated string
411:            //
412:            // To avoid alloc'ing a new byte array, we
413:            // do this by hand, rather than calling getNullTerminatedBytes()
414:            //
415:            final String readString() {
416:                int i = this .position;
417:                int len = 0;
418:                int maxLen = getBufLength();
419:
420:                while ((i < maxLen) && (this .byteBuffer[i] != 0)) {
421:                    len++;
422:                    i++;
423:                }
424:
425:                String s = new String(this .byteBuffer, this .position, len);
426:                this .position += (len + 1); // update cursor
427:
428:                return s;
429:            }
430:
431:            final String readString(String encoding) throws SQLException {
432:                int i = this .position;
433:                int len = 0;
434:                int maxLen = getBufLength();
435:
436:                while ((i < maxLen) && (this .byteBuffer[i] != 0)) {
437:                    len++;
438:                    i++;
439:                }
440:
441:                try {
442:                    return new String(this .byteBuffer, this .position, len,
443:                            encoding);
444:                } catch (UnsupportedEncodingException uEE) {
445:                    throw SQLError
446:                            .createSQLException(
447:                                    Messages.getString("ByteArrayBuffer.1") //$NON-NLS-1$
448:                                            + encoding + "'", SQLError.SQL_STATE_ILLEGAL_ARGUMENT); //$NON-NLS-1$
449:                } finally {
450:                    this .position += (len + 1); // update cursor
451:                }
452:            }
453:
454:            void setBufLength(int bufLengthToSet) {
455:                this .bufLength = bufLengthToSet;
456:            }
457:
458:            /**
459:             * Sets the array of bytes to use as a buffer to read from.
460:             * 
461:             * @param byteBuffer
462:             *            the array of bytes to use as a buffer
463:             */
464:            public void setByteBuffer(byte[] byteBufferToSet) {
465:                this .byteBuffer = byteBufferToSet;
466:            }
467:
468:            /**
469:             * Set the current position to write to/ read from
470:             * 
471:             * @param position
472:             *            the position (0-based index)
473:             */
474:            public void setPosition(int positionToSet) {
475:                this .position = positionToSet;
476:            }
477:
478:            /**
479:             * Sets whether this packet was part of a multipacket
480:             * 
481:             * @param flag
482:             *            was this packet part of a multipacket?
483:             */
484:            public void setWasMultiPacket(boolean flag) {
485:                this .wasMultiPacket = flag;
486:            }
487:
488:            public String toString() {
489:                return dumpClampedBytes(getPosition());
490:            }
491:
492:            public String toSuperString() {
493:                return super .toString();
494:            }
495:
496:            /**
497:             * Was this packet part of a multipacket?
498:             * 
499:             * @return was this packet part of a multipacket?
500:             */
501:            public boolean wasMultiPacket() {
502:                return this .wasMultiPacket;
503:            }
504:
505:            final void writeByte(byte b) throws SQLException {
506:                ensureCapacity(1);
507:
508:                this .byteBuffer[this .position++] = b;
509:            }
510:
511:            // Write a byte array
512:            final void writeBytesNoNull(byte[] bytes) throws SQLException {
513:                int len = bytes.length;
514:                ensureCapacity(len);
515:                System.arraycopy(bytes, 0, this .byteBuffer, this .position, len);
516:                this .position += len;
517:            }
518:
519:            // Write a byte array with the given offset and length
520:            final void writeBytesNoNull(byte[] bytes, int offset, int length)
521:                    throws SQLException {
522:                ensureCapacity(length);
523:                System.arraycopy(bytes, offset, this .byteBuffer, this .position,
524:                        length);
525:                this .position += length;
526:            }
527:
528:            final void writeDouble(double d) throws SQLException {
529:                long l = Double.doubleToLongBits(d);
530:                writeLongLong(l);
531:            }
532:
533:            final void writeFieldLength(long length) throws SQLException {
534:                if (length < 251) {
535:                    writeByte((byte) length);
536:                } else if (length < 65536L) {
537:                    ensureCapacity(3);
538:                    writeByte((byte) 252);
539:                    writeInt((int) length);
540:                } else if (length < 16777216L) {
541:                    ensureCapacity(4);
542:                    writeByte((byte) 253);
543:                    writeLongInt((int) length);
544:                } else {
545:                    ensureCapacity(9);
546:                    writeByte((byte) 254);
547:                    writeLongLong(length);
548:                }
549:            }
550:
551:            final void writeFloat(float f) throws SQLException {
552:                ensureCapacity(4);
553:
554:                int i = Float.floatToIntBits(f);
555:                byte[] b = this .byteBuffer;
556:                b[this .position++] = (byte) (i & 0xff);
557:                b[this .position++] = (byte) (i >>> 8);
558:                b[this .position++] = (byte) (i >>> 16);
559:                b[this .position++] = (byte) (i >>> 24);
560:            }
561:
562:            // 2000-06-05 Changed
563:            final void writeInt(int i) throws SQLException {
564:                ensureCapacity(2);
565:
566:                byte[] b = this .byteBuffer;
567:                b[this .position++] = (byte) (i & 0xff);
568:                b[this .position++] = (byte) (i >>> 8);
569:            }
570:
571:            // Write a String using the specified character
572:            // encoding
573:            final void writeLenBytes(byte[] b) throws SQLException {
574:                int len = b.length;
575:                ensureCapacity(len + 9);
576:                writeFieldLength(len);
577:                System.arraycopy(b, 0, this .byteBuffer, this .position, len);
578:                this .position += len;
579:            }
580:
581:            // Write a String using the specified character
582:            // encoding
583:            final void writeLenString(String s, String encoding,
584:                    String serverEncoding,
585:                    SingleByteCharsetConverter converter,
586:                    boolean parserKnowsUnicode, ConnectionImpl conn)
587:                    throws UnsupportedEncodingException, SQLException {
588:                byte[] b = null;
589:
590:                if (converter != null) {
591:                    b = converter.toBytes(s);
592:                } else {
593:                    b = StringUtils.getBytes(s, encoding, serverEncoding,
594:                            parserKnowsUnicode, conn);
595:                }
596:
597:                int len = b.length;
598:                ensureCapacity(len + 9);
599:                writeFieldLength(len);
600:                System.arraycopy(b, 0, this .byteBuffer, this .position, len);
601:                this .position += len;
602:            }
603:
604:            // 2000-06-05 Changed
605:            final void writeLong(long i) throws SQLException {
606:                ensureCapacity(4);
607:
608:                byte[] b = this .byteBuffer;
609:                b[this .position++] = (byte) (i & 0xff);
610:                b[this .position++] = (byte) (i >>> 8);
611:                b[this .position++] = (byte) (i >>> 16);
612:                b[this .position++] = (byte) (i >>> 24);
613:            }
614:
615:            // 2000-06-05 Changed
616:            final void writeLongInt(int i) throws SQLException {
617:                ensureCapacity(3);
618:                byte[] b = this .byteBuffer;
619:                b[this .position++] = (byte) (i & 0xff);
620:                b[this .position++] = (byte) (i >>> 8);
621:                b[this .position++] = (byte) (i >>> 16);
622:            }
623:
624:            final void writeLongLong(long i) throws SQLException {
625:                ensureCapacity(8);
626:                byte[] b = this .byteBuffer;
627:                b[this .position++] = (byte) (i & 0xff);
628:                b[this .position++] = (byte) (i >>> 8);
629:                b[this .position++] = (byte) (i >>> 16);
630:                b[this .position++] = (byte) (i >>> 24);
631:                b[this .position++] = (byte) (i >>> 32);
632:                b[this .position++] = (byte) (i >>> 40);
633:                b[this .position++] = (byte) (i >>> 48);
634:                b[this .position++] = (byte) (i >>> 56);
635:            }
636:
637:            // Write null-terminated string
638:            final void writeString(String s) throws SQLException {
639:                ensureCapacity((s.length() * 2) + 1);
640:                writeStringNoNull(s);
641:                this .byteBuffer[this .position++] = 0;
642:            }
643:
644:            //	 Write null-terminated string in the given encoding
645:            final void writeString(String s, String encoding,
646:                    ConnectionImpl conn) throws SQLException {
647:                ensureCapacity((s.length() * 2) + 1);
648:                try {
649:                    writeStringNoNull(s, encoding, encoding, false, conn);
650:                } catch (UnsupportedEncodingException ue) {
651:                    throw new SQLException(ue.toString(),
652:                            SQLError.SQL_STATE_GENERAL_ERROR);
653:                }
654:
655:                this .byteBuffer[this .position++] = 0;
656:            }
657:
658:            // Write string, with no termination
659:            final void writeStringNoNull(String s) throws SQLException {
660:                int len = s.length();
661:                ensureCapacity(len * 2);
662:                System.arraycopy(s.getBytes(), 0, this .byteBuffer,
663:                        this .position, len);
664:                this .position += len;
665:
666:                // for (int i = 0; i < len; i++)
667:                // {
668:                // this.byteBuffer[this.position++] = (byte)s.charAt(i);
669:                // }
670:            }
671:
672:            // Write a String using the specified character
673:            // encoding
674:            final void writeStringNoNull(String s, String encoding,
675:                    String serverEncoding, boolean parserKnowsUnicode,
676:                    ConnectionImpl conn) throws UnsupportedEncodingException,
677:                    SQLException {
678:                byte[] b = StringUtils.getBytes(s, encoding, serverEncoding,
679:                        parserKnowsUnicode, conn);
680:
681:                int len = b.length;
682:                ensureCapacity(len);
683:                System.arraycopy(b, 0, this.byteBuffer, this.position, len);
684:                this.position += len;
685:            }
686:        }
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