| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package java.nio; |
| |
| import libcore.io.SizeOf; |
| import libcore.io.Memory; |
| |
| /** |
| * HeapByteBuffer, ReadWriteHeapByteBuffer and ReadOnlyHeapByteBuffer compose |
| * the implementation of array based byte buffers. |
| * <p> |
| * HeapByteBuffer implements all the shared readonly methods and is extended by |
| * the other two classes. |
| * </p> |
| * <p> |
| * All methods are marked final for runtime performance. |
| * </p> |
| * |
| */ |
| abstract class HeapByteBuffer extends BaseByteBuffer { |
| |
| /** |
| * These fields are non-private for NioUtils.unsafeArray. |
| */ |
| final byte[] backingArray; |
| final int offset; |
| |
| HeapByteBuffer(byte[] backingArray) { |
| this(backingArray, backingArray.length, 0); |
| } |
| |
| HeapByteBuffer(int capacity) { |
| this(new byte[capacity], capacity, 0); |
| } |
| |
| HeapByteBuffer(byte[] backingArray, int capacity, int offset) { |
| super(capacity, null); |
| this.backingArray = backingArray; |
| this.offset = offset; |
| if (offset + capacity > backingArray.length) { |
| throw new IndexOutOfBoundsException("backingArray.length=" + backingArray.length + |
| ", capacity=" + capacity + ", offset=" + offset); |
| } |
| } |
| |
| @Override |
| public final ByteBuffer get(byte[] dst, int dstOffset, int byteCount) { |
| checkGetBounds(1, dst.length, dstOffset, byteCount); |
| System.arraycopy(backingArray, offset + position, dst, dstOffset, byteCount); |
| position += byteCount; |
| return this; |
| } |
| |
| final void get(char[] dst, int dstOffset, int charCount) { |
| int byteCount = checkGetBounds(SizeOf.CHAR, dst.length, dstOffset, charCount); |
| Memory.unsafeBulkGet(dst, dstOffset, byteCount, backingArray, offset + position, SizeOf.CHAR, order.needsSwap); |
| position += byteCount; |
| } |
| |
| final void get(double[] dst, int dstOffset, int doubleCount) { |
| int byteCount = checkGetBounds(SizeOf.DOUBLE, dst.length, dstOffset, doubleCount); |
| Memory.unsafeBulkGet(dst, dstOffset, byteCount, backingArray, offset + position, SizeOf.DOUBLE, order.needsSwap); |
| position += byteCount; |
| } |
| |
| final void get(float[] dst, int dstOffset, int floatCount) { |
| int byteCount = checkGetBounds(SizeOf.FLOAT, dst.length, dstOffset, floatCount); |
| Memory.unsafeBulkGet(dst, dstOffset, byteCount, backingArray, offset + position, SizeOf.FLOAT, order.needsSwap); |
| position += byteCount; |
| } |
| |
| final void get(int[] dst, int dstOffset, int intCount) { |
| int byteCount = checkGetBounds(SizeOf.INT, dst.length, dstOffset, intCount); |
| Memory.unsafeBulkGet(dst, dstOffset, byteCount, backingArray, offset + position, SizeOf.INT, order.needsSwap); |
| position += byteCount; |
| } |
| |
| final void get(long[] dst, int dstOffset, int longCount) { |
| int byteCount = checkGetBounds(SizeOf.LONG, dst.length, dstOffset, longCount); |
| Memory.unsafeBulkGet(dst, dstOffset, byteCount, backingArray, offset + position, SizeOf.LONG, order.needsSwap); |
| position += byteCount; |
| } |
| |
| final void get(short[] dst, int dstOffset, int shortCount) { |
| int byteCount = checkGetBounds(SizeOf.SHORT, dst.length, dstOffset, shortCount); |
| Memory.unsafeBulkGet(dst, dstOffset, byteCount, backingArray, offset + position, SizeOf.SHORT, order.needsSwap); |
| position += byteCount; |
| } |
| |
| @Override |
| public final byte get() { |
| if (position == limit) { |
| throw new BufferUnderflowException(); |
| } |
| return backingArray[offset + position++]; |
| } |
| |
| @Override |
| public final byte get(int index) { |
| checkIndex(index); |
| return backingArray[offset + index]; |
| } |
| |
| @Override |
| public final char getChar() { |
| int newPosition = position + SizeOf.CHAR; |
| if (newPosition > limit) { |
| throw new BufferUnderflowException(); |
| } |
| char result = (char) Memory.peekShort(backingArray, offset + position, order); |
| position = newPosition; |
| return result; |
| } |
| |
| @Override |
| public final char getChar(int index) { |
| checkIndex(index, SizeOf.CHAR); |
| return (char) Memory.peekShort(backingArray, offset + index, order); |
| } |
| |
| @Override |
| public final double getDouble() { |
| return Double.longBitsToDouble(getLong()); |
| } |
| |
| @Override |
| public final double getDouble(int index) { |
| return Double.longBitsToDouble(getLong(index)); |
| } |
| |
| @Override |
| public final float getFloat() { |
| return Float.intBitsToFloat(getInt()); |
| } |
| |
| @Override |
| public final float getFloat(int index) { |
| return Float.intBitsToFloat(getInt(index)); |
| } |
| |
| @Override |
| public final int getInt() { |
| int newPosition = position + SizeOf.INT; |
| if (newPosition > limit) { |
| throw new BufferUnderflowException(); |
| } |
| int result = Memory.peekInt(backingArray, offset + position, order); |
| position = newPosition; |
| return result; |
| } |
| |
| @Override |
| public final int getInt(int index) { |
| checkIndex(index, SizeOf.INT); |
| return Memory.peekInt(backingArray, offset + index, order); |
| } |
| |
| @Override |
| public final long getLong() { |
| int newPosition = position + SizeOf.LONG; |
| if (newPosition > limit) { |
| throw new BufferUnderflowException(); |
| } |
| long result = Memory.peekLong(backingArray, offset + position, order); |
| position = newPosition; |
| return result; |
| } |
| |
| @Override |
| public final long getLong(int index) { |
| checkIndex(index, SizeOf.LONG); |
| return Memory.peekLong(backingArray, offset + index, order); |
| } |
| |
| @Override |
| public final short getShort() { |
| int newPosition = position + SizeOf.SHORT; |
| if (newPosition > limit) { |
| throw new BufferUnderflowException(); |
| } |
| short result = Memory.peekShort(backingArray, offset + position, order); |
| position = newPosition; |
| return result; |
| } |
| |
| @Override |
| public final short getShort(int index) { |
| checkIndex(index, SizeOf.SHORT); |
| return Memory.peekShort(backingArray, offset + index, order); |
| } |
| |
| @Override |
| public final boolean isDirect() { |
| return false; |
| } |
| } |