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Java library to serialize and deserialize Java objects to the Internet Computer Candid types.

There is a newer version: 0.7.4

/*
 * Copyright 2021 Exilor Inc.
 *
 * Licensed 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.ic4j.candid;

public final class ByteUtils {
	
	/*
	 * Helper function to convert byte array to unsigned int array. 
	 * Makes easier to compare with data in Rust implementation
	 */

	public static int[] toUnsignedIntegerArray(byte[] input)
	{
		int[] output = new int[input.length];
		
		for(int i = 0; i < input.length; i++)
			output[i] = Byte.toUnsignedInt(input[i]);
			
		return output;
	}
	
	public static byte[] toSignedByteArray(int[] input)
	{
		byte[] output = new byte[input.length];
		
		for(int i = 0; i < input.length; i++)
			output[i] = (byte)input[i];
			
		return output;
	}
	
	public static long getUnsignedInt(int x) {
	    if(x > 0) return x;
	    long res = (long)(Math.pow(2, 32)) + x;
	    return res;
	}	
	
	public static int compareByteArrays(byte[] bytes1, byte[] bytes2) {
		int result = 0;

		int i = 0;
		while (bytes1.length > i && bytes2.length > i) {

			result = Long.compare(Byte.toUnsignedLong(bytes1[i]), Byte.toUnsignedLong(bytes2[i]));

			if (result != 0)
				break;
			i++;
		}
		
		return result;
	}	

}