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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/serial/VariableLengthIntBuffer.java @ 22157:dc83cc1f94f2

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Using fully qualified imports
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 16 Sep 2015 11:33:22 +0200
parents 9c8c0937da41
children
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1 /*
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2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation. Oracle designates this
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8 * particular file as subject to the "Classpath" exception as provided
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9 * by Oracle in the LICENSE file that accompanied this code.
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10 *
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11 * This code is distributed in the hope that it will be useful, but WITHOUT
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 * version 2 for more details (a copy is included in the LICENSE file that
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15 * accompanied this code).
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16 *
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17 * You should have received a copy of the GNU General Public License version
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18 * 2 along with this work; if not, write to the Free Software Foundation,
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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20 *
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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22 * or visit www.oracle.com if you need additional information or have any
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23 * questions.
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24 */
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25 package com.oracle.truffle.api.nodes.serial;
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26
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27 import java.nio.ByteBuffer;
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28
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29 /**
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30 * Experimental API. May change without notice. Simple variable length unsigned int buffer backed by
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31 * a byte buffer.
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32 */
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33 public class VariableLengthIntBuffer {
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34
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35 public static final int NULL = -1;
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36
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37 private ByteBuffer buffer;
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38
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39 public VariableLengthIntBuffer(ByteBuffer buffer) {
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40 this.buffer = buffer;
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41 }
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42
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43 public VariableLengthIntBuffer(byte[] array) {
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44 buffer = ByteBuffer.wrap(array);
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45 }
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46
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47 /**
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48 * Returns the backing byte buffer.
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49 */
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50 public ByteBuffer getBuffer() {
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51 return buffer;
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52 }
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53
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54 public byte[] getBytes() {
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55 int pos = buffer.position();
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56 byte[] bytes = new byte[buffer.position()];
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57 buffer.rewind();
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58 buffer.get(bytes);
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59 buffer.position(pos);
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60 return bytes;
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61 }
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62
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63 public int get() {
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64 byte peekByte = buffer.get(buffer.position());
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65 if ((peekByte & 0x80) == 0) {
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66 // single byte encoding with prefix 0 (range 127)
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67 return buffer.get(); // no bit to be masked
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68 } else {
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69 if (peekByte == (byte) 0xFF) {
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70 buffer.get(); // skip one byte
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71 return NULL;
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72 }
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73 int result = buffer.getInt() & 0x7FFF_FFFF; // first bit masked out
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74 assert (result & 0x4000_0000) == 0;
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75 return result;
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76 }
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77 }
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78
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79 public void put(int i) {
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80 ensureCapacity();
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81 if (i == NULL) {
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82 buffer.put((byte) 0xFF);
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83 } else if ((i & 0xFFFF_FF80) == 0) { // 7 bits data
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84 buffer.put((byte) i);
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85 } else if ((i & 0xC000_0000) == 0) { // 32 bits data
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86 buffer.putInt(i | 0x8000_0000); // append leading 1
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87 } else {
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88 throw new IllegalArgumentException("Integer out of encodeable " + i);
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89 }
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90 }
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91
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92 private void ensureCapacity() {
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93 if (buffer.position() + 4 > buffer.capacity()) {
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94 ByteBuffer newBuffer = ByteBuffer.allocate(buffer.capacity() * 2);
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95
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96 int pos = buffer.position();
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97 buffer.rewind();
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98 newBuffer.put(buffer);
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99 newBuffer.position(pos);
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100
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101 buffer = newBuffer;
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102 }
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103 }
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104
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105 public boolean hasRemaining() {
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106 return buffer.hasRemaining();
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107 }
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108
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109 }