| 1 | /* |
| 2 | * $Id: UnsignedByteBuffer.java,v 1.2 2005/12/16 22:32:46 hastings Exp $ |
| 3 | * |
| 4 | * (c) Copyright, Moebius Solutions, Inc., 2004 |
| 5 | * |
| 6 | * All Rights Reserved |
| 7 | * |
| 8 | * This material may be reproduced by or for the U. S. Government |
| 9 | * pursuant to the copyright license under the clause at |
| 10 | * DFARS 252.227-7014 (OCT 2001). |
| 11 | */ |
| 12 | package com.moesol.nio; |
| 13 | |
| 14 | import java.nio.ByteBuffer; |
| 15 | import java.nio.ByteOrder; |
| 16 | |
| 17 | import com.moesol.bindings.NativeStructure; |
| 18 | |
| 19 | |
| 20 | /** |
| 21 | * Help getting bytes back as unsigned. |
| 22 | * |
| 23 | * @author Hastings |
| 24 | */ |
| 25 | public class UnsignedByteBuffer implements BufferMarker, Comparable { |
| 26 | |
| 27 | private final ByteBuffer m_byte_buffer; |
| 28 | |
| 29 | public UnsignedByteBuffer(ByteBuffer b) { |
| 30 | m_byte_buffer = b; |
| 31 | } |
| 32 | public static UnsignedByteBuffer allocate(int capacity) { |
| 33 | return new UnsignedByteBuffer(ByteBuffer.allocate(capacity)); |
| 34 | } |
| 35 | |
| 36 | public short get() { |
| 37 | short r = m_byte_buffer.get(); |
| 38 | return makeUnsigned(r); |
| 39 | } |
| 40 | public short get(int offset) { |
| 41 | return makeUnsigned(m_byte_buffer.get(offset)); |
| 42 | } |
| 43 | public void get(short[] result) { |
| 44 | for (int i = 0; i < result.length; i++) { |
| 45 | result[i] = get(); |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | public void put(short v) { |
| 50 | m_byte_buffer.put((byte)v); |
| 51 | } |
| 52 | public void put(int offset, short v) { |
| 53 | m_byte_buffer.put(offset, (byte)v); |
| 54 | } |
| 55 | public void put(short[] values) { |
| 56 | for (int i = 0; i < values.length; i++) { |
| 57 | put(values[i]); |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * @param r |
| 63 | * @return unsigned short |
| 64 | */ |
| 65 | private short makeUnsigned(short r) { |
| 66 | return (short)(r & 0xFF); |
| 67 | } |
| 68 | |
| 69 | /** |
| 70 | * @return shorts remaining |
| 71 | */ |
| 72 | public int remaining() { |
| 73 | return m_byte_buffer.remaining(); |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * @return number of shorts in this buffer |
| 78 | */ |
| 79 | public int limit() { |
| 80 | return m_byte_buffer.limit(); |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * @return number of shorts this buffer could store |
| 85 | */ |
| 86 | public int capacity() { |
| 87 | return m_byte_buffer.capacity(); |
| 88 | } |
| 89 | /** |
| 90 | * @param bo |
| 91 | */ |
| 92 | public void order(ByteOrder bo) { |
| 93 | m_byte_buffer.order(bo); |
| 94 | } |
| 95 | public BufferMarker flip() { |
| 96 | m_byte_buffer.flip(); |
| 97 | return this; |
| 98 | } |
| 99 | /** |
| 100 | * @return underlying byte buffer |
| 101 | */ |
| 102 | public ByteBuffer getByteBuffer() { |
| 103 | return m_byte_buffer; |
| 104 | } |
| 105 | |
| 106 | public int compareTo(Object o) { |
| 107 | UnsignedByteBuffer other = (UnsignedByteBuffer)o; |
| 108 | return m_byte_buffer.compareTo(other.getByteBuffer()); |
| 109 | } |
| 110 | |
| 111 | private int sizeof() { |
| 112 | return NativeStructure.getUnsignedByteSize(); |
| 113 | } |
| 114 | public int position() { |
| 115 | return m_byte_buffer.position() / sizeof(); |
| 116 | } |
| 117 | public BufferMarker position(int newPosition) { |
| 118 | m_byte_buffer.position(newPosition * sizeof()); |
| 119 | return this; |
| 120 | } |
| 121 | public BufferMarker limit(int newLimit) { |
| 122 | m_byte_buffer.limit(newLimit * sizeof()); |
| 123 | return this; |
| 124 | } |
| 125 | public BufferMarker mark() { |
| 126 | m_byte_buffer.mark(); |
| 127 | return this; |
| 128 | } |
| 129 | public BufferMarker reset() { |
| 130 | m_byte_buffer.reset(); |
| 131 | return this; |
| 132 | } |
| 133 | public BufferMarker clear() { |
| 134 | m_byte_buffer.clear(); |
| 135 | return this; |
| 136 | } |
| 137 | public BufferMarker rewind() { |
| 138 | m_byte_buffer.rewind(); |
| 139 | return this; |
| 140 | } |
| 141 | public boolean hasRemaining() { |
| 142 | return m_byte_buffer.hasRemaining(); |
| 143 | } |
| 144 | public boolean isReadOnly() { |
| 145 | return m_byte_buffer.isReadOnly(); |
| 146 | } |
| 147 | |
| 148 | public boolean equals(Object arg0) { |
| 149 | return 0 == compareTo(arg0); |
| 150 | } |
| 151 | |
| 152 | public int hashCode() { |
| 153 | return m_byte_buffer.hashCode(); |
| 154 | } |
| 155 | |
| 156 | } |