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/* Copyright (c) 2008-2023, Nathan Sweet
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following
 * conditions are met:
 * 
 * - Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
 * disclaimer in the documentation and/or other materials provided with the distribution.
 * - Neither the name of Esoteric Software nor the names of its contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

package com.esotericsoftware.kryo.unsafe;

import static com.esotericsoftware.kryo.unsafe.UnsafeUtil.*;

import com.esotericsoftware.kryo.KryoException;
import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.util.Util;

import java.io.InputStream;

/** An {@link Input} that reads data from a byte[] using sun.misc.Unsafe. Multi-byte primitive types use native byte order, so the
 * native byte order on different computers which read and write the data must be the same.
 * 

* Not available on all JVMs. {@link Util#unsafe} can be checked before using this class. *

* This class may be much faster when {@link #setVariableLengthEncoding(boolean)} is false. * @author Roman Levenstein * @author Nathan Sweet */ @SuppressWarnings("restriction") public class UnsafeInput extends Input { /** Creates an uninitialized Input, {@link #setBuffer(byte[])} must be called before the Input is used. */ public UnsafeInput () { } /** Creates a new Input for reading from a byte[] buffer. * @param bufferSize The size of the buffer. An exception is thrown if more bytes than this are read and * {@link #fill(byte[], int, int)} does not supply more bytes. */ public UnsafeInput (int bufferSize) { super(bufferSize); } /** Creates a new Input for reading from a byte[] buffer. * @param buffer An exception is thrown if more bytes than this are read and {@link #fill(byte[], int, int)} does not supply * more bytes. */ public UnsafeInput (byte[] buffer) { super(buffer); } /** Creates a new Input for reading from a byte[] buffer. * @param buffer An exception is thrown if more bytes than this are read and {@link #fill(byte[], int, int)} does not supply * more bytes. */ public UnsafeInput (byte[] buffer, int offset, int count) { super(buffer, offset, count); } /** Creates a new Input for reading from an InputStream with a buffer size of 4096. */ public UnsafeInput (InputStream inputStream) { super(inputStream); } /** Creates a new Input for reading from an InputStream with the specified buffer size. */ public UnsafeInput (InputStream inputStream, int bufferSize) { super(inputStream, bufferSize); } public int read () throws KryoException { if (optional(1) <= 0) return -1; return unsafe.getByte(buffer, byteArrayBaseOffset + position++) & 0xFF; } public byte readByte () throws KryoException { if (position == limit) require(1); return unsafe.getByte(buffer, byteArrayBaseOffset + position++); } public int readByteUnsigned () throws KryoException { if (position == limit) require(1); return unsafe.getByte(buffer, byteArrayBaseOffset + position++) & 0xFF; } public int readInt () throws KryoException { require(4); int result = unsafe.getInt(buffer, byteArrayBaseOffset + position); position += 4; return result; } public long readLong () throws KryoException { require(8); long result = unsafe.getLong(buffer, byteArrayBaseOffset + position); position += 8; return result; } public float readFloat () throws KryoException { require(4); float result = unsafe.getFloat(buffer, byteArrayBaseOffset + position); position += 4; return result; } public double readDouble () throws KryoException { require(8); double result = unsafe.getDouble(buffer, byteArrayBaseOffset + position); position += 8; return result; } public short readShort () throws KryoException { require(2); short result = unsafe.getShort(buffer, byteArrayBaseOffset + position); position += 2; return result; } public char readChar () throws KryoException { require(2); char result = unsafe.getChar(buffer, byteArrayBaseOffset + position); position += 2; return result; } public boolean readBoolean () throws KryoException { if (position == limit) require(1); boolean result = unsafe.getByte(buffer, byteArrayBaseOffset + position++) != 0; return result; } public int[] readInts (int length) throws KryoException { int[] array = new int[length]; readBytes(array, intArrayBaseOffset, length << 2); return array; } public long[] readLongs (int length) throws KryoException { long[] array = new long[length]; readBytes(array, longArrayBaseOffset, length << 3); return array; } public float[] readFloats (int length) throws KryoException { float[] array = new float[length]; readBytes(array, floatArrayBaseOffset, length << 2); return array; } public double[] readDoubles (int length) throws KryoException { double[] array = new double[length]; readBytes(array, doubleArrayBaseOffset, length << 3); return array; } public short[] readShorts (int length) throws KryoException { short[] array = new short[length]; readBytes(array, shortArrayBaseOffset, length << 1); return array; } public char[] readChars (int length) throws KryoException { char[] array = new char[length]; readBytes(array, charArrayBaseOffset, length << 1); return array; } public boolean[] readBooleans (int length) throws KryoException { boolean[] array = new boolean[length]; readBytes(array, booleanArrayBaseOffset, length); return array; } public void readBytes (byte[] bytes, int offset, int count) throws KryoException { readBytes(bytes, byteArrayBaseOffset + offset, count); } /** Read count bytes and write them to the object at the given offset inside the in-memory representation of the object. */ public void readBytes (Object to, long offset, int count) throws KryoException { int copyCount = Math.min(limit - position, count); while (true) { unsafe.copyMemory(buffer, byteArrayBaseOffset + position, to, offset, copyCount); position += copyCount; count -= copyCount; if (count == 0) break; offset += copyCount; copyCount = Math.min(count, capacity); require(copyCount); } } }





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