/*
* 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 org.apache.ignite.internal.util;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.UUID;
/**
* Primitive to byte array and backward conversions.
*/
public abstract class GridClientByteUtils {
/**
* Converts primitive {@code short} type to byte array.
*
* @param s Short value.
* @return Array of bytes.
*/
public static byte[] shortToBytes(short s) {
return toBytes(s, new byte[2], 0, 2);
}
/**
* Converts primitive {@code int} type to byte array.
*
* @param i Integer value.
* @return Array of bytes.
*/
public static byte[] intToBytes(int i) {
return toBytes(i, new byte[4], 0, 4);
}
/**
* Converts primitive {@code long} type to byte array.
*
* @param l Long value.
* @return Array of bytes.
*/
public static byte[] longToBytes(long l) {
return toBytes(l, new byte[8], 0, 8);
}
/**
* Converts primitive {@code short} type to byte array and stores it in specified
* byte array.
*
* @param s Short value.
* @param bytes Array of bytes.
* @param off Offset in {@code bytes} array.
* @return Number of bytes overwritten in {@code bytes} array.
*/
public static int shortToBytes(short s, byte[] bytes, int off) {
toBytes(s, bytes, off, 2);
return 2;
}
/**
* Converts primitive {@code int} type to byte array and stores it in specified
* byte array.
*
* @param i Integer value.
* @param bytes Array of bytes.
* @param off Offset in {@code bytes} array.
* @return Number of bytes overwritten in {@code bytes} array.
*/
public static int intToBytes(int i, byte[] bytes, int off) {
toBytes(i, bytes, off, 4);
return 4;
}
/**
* Converts primitive {@code long} type to byte array and stores it in specified
* byte array.
*
* @param l Long value.
* @param bytes Array of bytes.
* @param off Offset in {@code bytes} array.
* @return Number of bytes overwritten in {@code bytes} array.
*/
public static int longToBytes(long l, byte[] bytes, int off) {
toBytes(l, bytes, off, 8);
return 8;
}
/**
* Converts an UUID to byte array.
*
* @param uuid UUID value.
* @return Encoded into byte array {@link UUID}.
*/
public static byte[] uuidToBytes(UUID uuid) {
byte[] bytes = new byte[(Long.SIZE >> 3) * 2];
uuidToBytes(uuid, bytes, 0);
return bytes;
}
/**
* Converts {@code UUID} type to byte array and stores it in specified byte array.
*
* @param uuid UUID to convert.
* @param bytes Array of bytes.
* @param off Offset in {@code bytes} array.
* @return Number of bytes overwritten in {@code bytes} array.
*/
public static int uuidToBytes(UUID uuid, byte[] bytes, int off) {
ByteBuffer buf = ByteBuffer.wrap(bytes, off, 16);
buf.order(ByteOrder.BIG_ENDIAN);
if (uuid != null) {
buf.putLong(uuid.getMostSignificantBits());
buf.putLong(uuid.getLeastSignificantBits());
}
else {
buf.putLong(0);
buf.putLong(0);
}
return 16;
}
/**
* Constructs {@code short} from byte array.
*
* @param bytes Array of bytes.
* @param off Offset in {@code bytes} array.
* @return Short value.
*/
public static short bytesToShort(byte[] bytes, int off) {
return (short)fromBytes(bytes, off, 2);
}
/**
* Constructs {@code int} from byte array.
*
* @param bytes Array of bytes.
* @param off Offset in {@code bytes} array.
* @return Integer value.
*/
public static int bytesToInt(byte[] bytes, int off) {
return (int)fromBytes(bytes, off, 4);
}
/**
* Constructs {@code long} from byte array.
*
* @param bytes Array of bytes.
* @param off Offset in {@code bytes} array.
* @return Long value.
*/
public static long bytesToLong(byte[] bytes, int off) {
return fromBytes(bytes, off, 8);
}
/**
* Constructs {@link UUID} from byte array.
*
* @param bytes Array of bytes.
* @param off Offset in {@code bytes} array.
* @return UUID value.
*/
public static UUID bytesToUuid(byte[] bytes, int off) {
ByteBuffer buf = ByteBuffer.wrap(bytes, off, 16);
buf.order(ByteOrder.BIG_ENDIAN);
long most = buf.getLong();
long least = buf.getLong();
return most != 0 && least != 0 ? new UUID(most, least) : null;
}
/**
* Converts primitive {@code long} type to byte array and stores it in specified
* byte array. The highest byte in the value is the first byte in result array.
*
* @param l Unsigned long value.
* @param bytes Bytes array to write result to.
* @param off Offset in the target array to write result to.
* @param limit Limit of bytes to write into output.
* @return Number of bytes overwritten in {@code bytes} array.
*/
private static byte[] toBytes(long l, byte[] bytes, int off, int limit) {
assert bytes != null;
assert limit <= 8;
assert bytes.length >= off + limit;
for (int i = limit - 1; i >= 0; i--) {
bytes[off + i] = (byte)(l & 0xFF);
l >>>= 8;
}
return bytes;
}
/**
* Constructs {@code long} from byte array. The first byte in array is the highest byte in result.
*
* @param bytes Array of bytes.
* @param off Offset in {@code bytes} array.
* @param limit Amount of bytes to use in the source array.
* @return Unsigned long value.
*/
private static long fromBytes(byte[] bytes, int off, int limit) {
assert bytes != null;
assert limit <= 8;
assert bytes.length >= off + limit;
long res = 0;
for (int i = 0; i < limit; i++) {
res <<= 8;
res |= bytes[off + i] & 0xFF;
}
return res;
}
}