libjava/java/nio/DirectByteBufferImpl.java

   1 /* DirectByteBufferImpl.java --
   2    Copyright (C) 2003 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package java.nio;
  40
  41 import gnu.classpath.Configuration;
  42 import gnu.gcj.RawData;
  43
  44 class DirectByteBufferImpl extends ByteBuffer
  45 {
  46   static
  47   {
  48     // load the shared library needed for native methods.
  49     if (Configuration.INIT_LOAD_LIBRARY)
  50       {
  51         System.loadLibrary ("javanio");
  52       }
  53   }
  54
  55   RawData address;
  56   private int offset;
  57   private boolean readOnly;
  58
  59   public DirectByteBufferImpl (RawData address, long len)
  60   {
  61     this (address, 0, (int) len, (int) len, 0, -1, false);
  62   }
  63
  64   public DirectByteBufferImpl (RawData address, int offset, int capacity,
  65                                int limit, int position, int mark,
  66                                boolean readOnly)
  67   {
  68     super (capacity, limit, position, mark);
  69     this.address = address;
  70     this.offset = offset;
  71     this.readOnly = readOnly;
  72   }
  73
  74   private static native RawData allocateImpl (int capacity);
  75   private static native void freeImpl (RawData address);
  76
  77   protected void finalize () throws Throwable
  78   {
  79     freeImpl (address);
  80   }
  81
  82   public static ByteBuffer allocateDirect (int capacity)
  83   {
  84     RawData address = allocateImpl (capacity);
  85
  86     if (address == null)
  87       throw new InternalError ("Not enough memory to create direct buffer");
  88
  89     return new DirectByteBufferImpl (address, 0, capacity, capacity, 0, -1, false);
  90   }
  91
  92   private native byte getImpl (int index);
  93   private native void putImpl (int index, byte value);
  94
  95   public byte get ()
  96   {
  97     byte result = getImpl (position () + offset);
  98     position (position () + 1);
  99     return result;
 100   }
 101
 102   public byte get (int index)
 103   {
 104     return getImpl (index);
 105   }
 106
 107   public ByteBuffer put (byte value)
 108   {
 109     putImpl (position (), value);
 110     position (position () + 1);
 111     return this;
 112   }
 113
 114   public ByteBuffer put (int index, byte value)
 115   {
 116     putImpl (index, value);
 117     return this;
 118   }
 119
 120   public ByteBuffer compact ()
 121   {
 122     // FIXME this can sure be optimized using memcpy()
 123     int copied = 0;
 124
 125     while (remaining () > 0)
 126       {
 127         put (copied, get ());
 128         copied++;
 129       }
 130
 131     position (copied);
 132     return this;
 133   }
 134
 135   public ByteBuffer duplicate ()
 136   {
 137     return new DirectByteBufferImpl (
 138       address, offset, capacity (), limit (), position (), -1, isReadOnly ());
 139   }
 140
 141   public ByteBuffer slice ()
 142   {
 143     return new DirectByteBufferImpl (address, position () + offset, remaining (), remaining (), 0, -1, isReadOnly ());
 144   }
 145
 146   public ByteBuffer asReadOnlyBuffer ()
 147   {
 148     return new DirectByteBufferImpl (
 149       address, offset, capacity (), limit (), position (), -1, true);
 150   }
 151
 152   public boolean isReadOnly ()
 153   {
 154     return readOnly;
 155   }
 156
 157   public boolean isDirect ()
 158   {
 159     return true;
 160   }
 161
 162   public CharBuffer asCharBuffer ()
 163   {
 164     return new CharViewBufferImpl (this, position () + offset, remaining (), remaining (), 0, -1, isReadOnly ());
 165   }
 166
 167   public DoubleBuffer asDoubleBuffer ()
 168   {
 169     return new DoubleViewBufferImpl (this, position () + offset, remaining (), remaining (), 0, -1, isReadOnly ());
 170   }
 171
 172   public FloatBuffer asFloatBuffer ()
 173   {
 174     return new FloatViewBufferImpl (this, position () + offset, remaining (), remaining (), 0, -1, isReadOnly ());
 175   }
 176
 177   public IntBuffer asIntBuffer ()
 178   {
 179     return new IntViewBufferImpl (this, position () + offset, remaining (), remaining (), 0, -1, isReadOnly ());
 180   }
 181
 182   public LongBuffer asLongBuffer ()
 183   {
 184     return new LongViewBufferImpl (this, position () + offset, remaining (), remaining (), 0, -1, isReadOnly ());
 185   }
 186
 187   public ShortBuffer asShortBuffer ()
 188   {
 189     return new ShortViewBufferImpl (this, position () + offset, remaining (), remaining (), 0, -1, isReadOnly ());
 190   }
 191
 192   final public char getChar ()
 193   {
 194     // FIXME: this handles little endian only
 195     return (char) (((get () & 0xff) << 8)
 196                    + (get () & 0xff));
 197   }
 198
 199   final public ByteBuffer putChar (char value)
 200   {
 201     // FIXME: this handles little endian only
 202     put ((byte) ((((int) value) & 0xff00) >> 8));
 203     put ((byte) (((int) value) & 0x00ff));
 204     return this;
 205   }
 206
 207   final public char getChar (int index)
 208   {
 209     // FIXME: this handles little endian only
 210     return (char) (((get (index) & 0xff) << 8)
 211                    + (get (index + 1) & 0xff));
 212   }
 213
 214   final public ByteBuffer putChar (int index, char value)
 215   {
 216     // FIXME: this handles little endian only
 217     put (index, (byte) ((((int) value) & 0xff00) >> 8));
 218     put (index + 1, (byte) (((int) value) & 0x00ff));
 219     return this;
 220   }
 221
 222   final public short getShort ()
 223   {
 224     // FIXME: this handles little endian only
 225     return (short) (((get () & 0xff) << 8)
 226                     + (get () & 0xff));
 227   }
 228
 229   final public ByteBuffer putShort (short value)
 230   {
 231     // FIXME: this handles little endian only
 232     put ((byte) ((((int) value) & 0xff00) >> 8));
 233     put ((byte) (((int) value) & 0x00ff));
 234     return this;
 235   }
 236
 237   final public short getShort (int index)
 238   {
 239     // FIXME: this handles little endian only
 240     return (short) (((get (index) & 0xff) << 8)
 241                     + (get (index + 1) & 0xff));
 242   }
 243
 244   final public ByteBuffer putShort (int index, short value)
 245   {
 246     // FIXME: this handles little endian only
 247     put (index, (byte) ((((int) value) & 0xff00) >> 8));
 248     put (index + 1, (byte) (((int) value) & 0x00ff));
 249     return this;
 250   }
 251
 252   final public int getInt ()
 253   {
 254     // FIXME: this handles little endian only
 255     return (int) (((get () & 0xff) << 24)
 256                   + ((get () & 0xff) << 16)
 257                   + ((get () & 0xff) << 8)
 258                   + (get () & 0xff));
 259   }
 260
 261   final public ByteBuffer putInt (int value)
 262   {
 263     // FIXME: this handles little endian only
 264     put ((byte) ((((int) value) & 0xff000000) >> 24));
 265     put ((byte) ((((int) value) & 0x00ff0000) >> 16));
 266     put ((byte) ((((int) value) & 0x0000ff00) >> 8));
 267     put ((byte) (((int) value) & 0x000000ff));
 268     return this;
 269   }
 270
 271   final public int getInt (int index)
 272   {
 273     // FIXME: this handles little endian only
 274     return (int) (((get (index) & 0xff) << 24)
 275                   + ((get (index + 1) & 0xff) << 16)
 276                   + ((get (index + 2) & 0xff) << 8)
 277                   + (get (index + 3) & 0xff));
 278   }
 279
 280   final public ByteBuffer putInt (int index, int value)
 281   {
 282     // FIXME: this handles little endian only
 283     put (index, (byte) ((((int) value) & 0xff000000) >> 24));
 284     put (index + 1, (byte) ((((int) value) & 0x00ff0000) >> 16));
 285     put (index + 2, (byte) ((((int) value) & 0x0000ff00) >> 8));
 286     put (index + 3, (byte) (((int) value) & 0x000000ff));
 287     return this;
 288   }
 289
 290   final public long getLong ()
 291   {
 292     // FIXME: this handles little endian only
 293     return (long) (((get () & 0xff) << 56)
 294                    + ((get () & 0xff) << 48)
 295                    + ((get () & 0xff) << 40)
 296                    + ((get () & 0xff) << 32)
 297                    + ((get () & 0xff) << 24)
 298                    + ((get () & 0xff) << 16)
 299                    + ((get () & 0xff) << 8)
 300                    + (get () & 0xff));
 301   }
 302
 303   final public ByteBuffer putLong (long value)
 304   {
 305     return ByteBufferHelper.putLong (this, value);
 306   }
 307
 308   final public long getLong (int index)
 309   {
 310     return ByteBufferHelper.getLong (this, index);
 311   }
 312
 313   final public ByteBuffer putLong (int index, long value)
 314   {
 315     return ByteBufferHelper.putLong (this, index, value);
 316   }
 317
 318   final public float getFloat ()
 319   {
 320     return ByteBufferHelper.getFloat (this);
 321   }
 322
 323   final public ByteBuffer putFloat (float value)
 324   {
 325     return ByteBufferHelper.putFloat (this, value);
 326   }
 327
 328   public final float getFloat (int index)
 329   {
 330     return ByteBufferHelper.getFloat (this, index);
 331   }
 332
 333   final public ByteBuffer putFloat (int index, float value)
 334   {
 335     return ByteBufferHelper.putFloat (this, index, value);
 336   }
 337
 338   final public double getDouble ()
 339   {
 340     return ByteBufferHelper.getDouble (this);
 341   }
 342
 343   final public ByteBuffer putDouble (double value)
 344   {
 345     return ByteBufferHelper.putDouble (this, value);
 346   }
 347
 348   final public double getDouble (int index)
 349   {
 350     return ByteBufferHelper.getDouble (this, index);
 351   }
 352
 353   final public ByteBuffer putDouble (int index, double value)
 354   {
 355     return ByteBufferHelper.putDouble (this, index, value);
 356   }
 357 }