Mercurial > hg > graal-compiler
annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/serial/VariableLengthIntBuffer.java @ 12388:96c1d057a5ed
Truffle: Added experimental serialization API.
author | Christian Humer <christian.humer@gmail.com> |
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date | Wed, 02 Oct 2013 15:33:08 +0200 |
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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.*; |
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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 } |