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neow3j: Java/Kotlin/Android Development Toolkit for the Neo Blockchain

There is a newer version: 3.23.0

package io.neow3j.serialization;

import java.util.List;

import static java.nio.charset.StandardCharsets.UTF_8;

public class IOUtils {

    /**
     * Gets the byte size of the given number when Neo-serialized.
     *
     * @param i The number.
     * @return the byte size.
     */
    public static int getVarSize(long i) {
        if (i < 0xFD) {
            return 1; // byte
        } else if (i <= 0xFFFF) {
            return 1 + 2; // 0xFD + uint16
        } else if (i <= 0xFFFFFFFFL) {
            return 1 + 4; // 0xFE + uint32
        } else {
            return 1 + 8; // 0xFF + uint64
        }
    }

    /**
     * Gets the byte size of the given list when Neo-serialized.
     *
     * @param serializables The list of serializables.
     * @return the byte size.
     */
    public static int getVarSize(List serializables) {
        int sizeByteSize = getVarSize(serializables.size());
        int objectsByteSize = serializables.stream()
                .map(NeoSerializableInterface::getSize)
                .reduce(0, Integer::sum);
        return sizeByteSize + objectsByteSize;
    }

    /**
     * Gets the byte size of the given byte array when Neo-serialized.
     *
     * @param bytes The bytes to serialize.
     * @return the byte size.
     */
    public static int getVarSize(byte[] bytes) {
        return getVarSize(bytes.length) + bytes.length;
    }

    /**
     * Gets the byte size of the given string when Neo-serialized. The string is interpreted as
     * UTF_8 encoded.
     *
     * @param value The string to serialize.
     * @return the byte size.
     */
    public static int getVarSize(String value) {
        return getVarSize(value.getBytes(UTF_8));
    }

}