| 1 | /* |
| 2 | * $Id: UnsignedLongBuffer.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 long (C size 4 bytes). |
| 22 | * |
| 23 | * @author Hastings |
| 24 | */ |
| 25 | public class UnsignedLongBuffer implements BufferMarker, Comparable { |
| 26 | |
| 27 | private final ByteBuffer m_byte_buffer; |
| 28 | |
| 29 | public UnsignedLongBuffer(ByteBuffer b) { |
| 30 | m_byte_buffer = b; |
| 31 | } |
| 32 | |
| 33 | /** |
| 34 | * @param length |
| 35 | * @return allocated byte buffer |
| 36 | */ |
| 37 | public static UnsignedLongBuffer allocate(int length) { |
| 38 | return new UnsignedLongBuffer(ByteBuffer.allocate(computeNumBytes(length))); |
| 39 | } |
| 40 | |
| 41 | public long get() { |
| 42 | long r = m_byte_buffer.getInt(); |
| 43 | return makeUnsigned(r); |
| 44 | } |
| 45 | public long get(int offset) { |
| 46 | return makeUnsigned(m_byte_buffer.getInt(offset)); |
| 47 | } |
| 48 | public void get(long[] result) { |
| 49 | for (int i = 0; i < result.length; i++) { |
| 50 | result[i] = get(); |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | public void put(long v) { |
| 55 | m_byte_buffer.putInt((int)v); |
| 56 | } |
| 57 | public void put(int offset, long v) { |
| 58 | m_byte_buffer.putInt(offset, (int)v); |
| 59 | } |
| 60 | public void put(long[] values) { |
| 61 | for (int i = 0; i < values.length; i++) { |
| 62 | put(values[i]); |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * @param r |
| 68 | * @return r as unsigned int/C++ long |
| 69 | */ |
| 70 | private long makeUnsigned(long r) { |
| 71 | return r & 0xFFFFFFFF; |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * @return true if more remaining |
| 76 | */ |
| 77 | public boolean hasRemaining() { |
| 78 | return m_byte_buffer.hasRemaining(); |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * @return remaining |
| 83 | */ |
| 84 | public int remaining() { |
| 85 | return computeNumEls(m_byte_buffer.remaining()); |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * @return limit |
| 90 | */ |
| 91 | public int limit() { |
| 92 | return computeNumEls(m_byte_buffer.limit()); |
| 93 | } |
| 94 | |
| 95 | /** |
| 96 | * @return capacity |
| 97 | */ |
| 98 | public int capacity() { |
| 99 | return computeNumEls(m_byte_buffer.capacity()); |
| 100 | } |
| 101 | |
| 102 | /** |
| 103 | * @return number of elements that fit in bytes count |
| 104 | */ |
| 105 | private static int computeNumEls(int bytes) { |
| 106 | assert(bytes % sizeof() == 0); |
| 107 | return bytes / sizeof(); |
| 108 | } |
| 109 | private static int computeNumBytes(int els) { |
| 110 | return els * sizeof(); |
| 111 | } |
| 112 | |
| 113 | |
| 114 | /** |
| 115 | * @return underlying byte buffer |
| 116 | */ |
| 117 | public ByteBuffer getByteBuffer() { |
| 118 | return m_byte_buffer; |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * @param bo |
| 123 | */ |
| 124 | public UnsignedLongBuffer order(ByteOrder bo) { |
| 125 | m_byte_buffer.order(bo); |
| 126 | return this; |
| 127 | } |
| 128 | |
| 129 | /** |
| 130 | * |
| 131 | */ |
| 132 | public BufferMarker flip() { |
| 133 | m_byte_buffer.flip(); |
| 134 | return this; |
| 135 | } |
| 136 | |
| 137 | public int compareTo(Object o) { |
| 138 | UnsignedLongBuffer other = (UnsignedLongBuffer)o; |
| 139 | return m_byte_buffer.compareTo(other.getByteBuffer()); |
| 140 | } |
| 141 | |
| 142 | private static int sizeof() { |
| 143 | return NativeStructure.getUnsignedLongSize(); |
| 144 | } |
| 145 | public int position() { |
| 146 | return computeNumEls(m_byte_buffer.position()); |
| 147 | } |
| 148 | public BufferMarker position(int newPosition) { |
| 149 | m_byte_buffer.position(computeNumBytes(newPosition)); |
| 150 | return this; |
| 151 | } |
| 152 | public BufferMarker limit(int newLimit) { |
| 153 | m_byte_buffer.limit(computeNumBytes(newLimit)); |
| 154 | return this; |
| 155 | } |
| 156 | public BufferMarker mark() { |
| 157 | m_byte_buffer.mark(); |
| 158 | return this; |
| 159 | } |
| 160 | public BufferMarker reset() { |
| 161 | m_byte_buffer.reset(); |
| 162 | return this; |
| 163 | } |
| 164 | public BufferMarker clear() { |
| 165 | m_byte_buffer.clear(); |
| 166 | return this; |
| 167 | } |
| 168 | public BufferMarker rewind() { |
| 169 | m_byte_buffer.rewind(); |
| 170 | return this; |
| 171 | } |
| 172 | public boolean isReadOnly() { |
| 173 | return m_byte_buffer.isReadOnly(); |
| 174 | } |
| 175 | |
| 176 | public boolean equals(Object arg0) { |
| 177 | return 0 == compareTo(arg0); |
| 178 | } |
| 179 | |
| 180 | public int hashCode() { |
| 181 | return m_byte_buffer.hashCode(); |
| 182 | } |
| 183 | } |